Change in proceeds of sales of investments available for sale receivable in period Noncash Investing and Financing Activities, Change in Proceeds of Sales of Investments Noncash Investing and Financing Activities, Change in Proceeds of Sales of Investments LTV 60 to 75 Percent LTV 60 to 75 Percent [Member] Loan-to-value (LTV) ratio from 60 to 75%. Municipals US States and Political Subdivisions Debt Securities [Member] Liabilities, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Debt-to-Value [Domain] Debt-to-Value [Domain] Related Party [Axis] Related Party [Axis] Net income attributable to FNF common shareholders and change in total equity Net Income (Loss) Attributable to Parent and Change in Equity Net Income (Loss) Attributable to Parent and Change in Equity Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] Revenue Recognition, Other Revenue Recognition, Other, Policy [Policy Text Block] Revenue Recognition, Other, Policy Mortality multiplier Fair Value Inputs Mortality Multiplier Fair Value Inputs Mortality Multiplier Increase in goodwill Goodwill, Purchase Accounting Adjustments Greater than 1.25 Greater Than One Point Two Five [Member] Greater Than One Point Two Five [Member] Summary of Unfunded Commitments Other Commitments [Table Text Block] F&G acquisition Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Acquisition Addition Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Acquisition Addition Licensing Agreements Licensing Agreements [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Premiums and other considerations: Premiums Earned, Net [Abstract] Liabilities of discontinued operations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities of Discontinued Operations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities of Discontinued Operations Loss (gain) on sales of investments and other assets and asset impairments, net Gain (Loss) on Investments and Disposition of Other Assets Gain (Loss) on Investments and Disposition of Other Assets Subsidiary dividends declared to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 3.40% Notes, net of discount Three Point Four Zero Percent Unsecured Notes Due September 2022 [Member] Three Point Four Zero Percent Unsecured Notes Due September 2022 Ovation Fin. Holdings 2 LLC, Ovation Fund Mgmt. II, LLC, Banc of California, N.A. v. Chicago Title Ins. Co., and plaintiffs Ovation Fin. Holdings 2 LLC, Ovation Fund Mgmt. II, LLC, Banc of California, N.A. v. Chicago Title Ins. Co., and plaintiffs [Member] Ovation Fin. Holdings 2 LLC, Ovation Fund Mgmt. II, LLC, Banc of California, N.A. v. Chicago Title Ins. Co., and plaintiffs Personnel costs Labor and Related Expense Preferred securities Preferred Stock [Member] Black Scholes model Black Scholes Model [Member] Black Scholes Model [Member] Security Exchange Name Security Exchange Name Investments Investments and Variable Interest Entities [Text Block] Investments and Variable Interest Entities [Text Block] Proceeds from issuance debt Proceeds from Issuance of Long-term Debt Reinsurance Disclosures [Abstract] Reinsurance Disclosures [Abstract] Derivative instruments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Derivative Instruments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Derivative Instruments Variable Rate [Domain] Variable Rate [Domain] Kubera Reassurance Company Kubera Reassurance Company [Member] Kubera Reassurance Company [Member] [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] ASSETS Assets [Abstract] Investment, Name [Axis] Investment, Name [Axis] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Less: Cash Acquired Cash Acquired from Acquisition AFS purchased credit-deteriorated par value Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Par Value Operating lease payments Operating Lease, Payments 2023 Long-Term Debt, Maturity, Year Three Commercial mortgage loans, percentage of investments Commercial Mortgage Loans, Percentage of Investments Commercial Mortgage Loans, Percentage of Investments Adjustment for net unrealized investment (gains) losses Deferred Policy Acquisition Costs and Present Value of Future Profits, Unrealized Investment Gain (Loss) Deferred Policy Acquisition Costs and Present Value of Future Profits, Unrealized Investment Gain (Loss) East South Central East South Central [Member] East South Central [Member] 2023 Present Value of Future Insurance Profits, Expected Amortization, Year Three Weighted average useful life (years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Treasury stock repurchased (in shares) Treasury Stock, Shares, Acquired Secured trust deposits Contract With Customer, Liability, Customer Deposits Contract With Customer, Liability, Customer Deposits Market value of option Fair Value Inputs Market Value Of Option Fair value inputs market value of option. Assets and Liabilities Carrying at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Future policy benefits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed,Liability for Future Policy Benefits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed,Liability for Future Policy Benefits Other intangible assets, net Intangible Assets, Net (Excluding Goodwill and Title Plants) Intangible Assets, Net (Excluding Goodwill and Title Plants) Benefits and other changes in policy reserves Policyholder Benefits and Claims Incurred, Net, Life and Annuity Preferred stock, $0.0001 par value; authorized 50,000,000 shares; issued and outstanding, none Preferred Stock, Value, Issued Residential Portfolio Segment Residential Portfolio Segment [Member] Net earnings from continuing operations attributable to FNF commons shareholders (in usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Agency title insurance premiums Insurance Contracts, Agency Title Insurance Premiums [Member] Insurance Contracts, Agency Title Insurance Premiums [Member] Other comprehensive earnings: Other Comprehensive Income (Loss), Net of Tax [Abstract] Common stock, par or stated value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Investments in unconsolidated affiliates Alternative Investment Other Other Products And Services [Member] Other Products And Services [Member] Document Information [Table] Document Information [Table] Collateral posted Collateral Derivative Asset, Collateral, Obligation to Return Cash, Offset Net earnings from continuing operations Net earnings (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest West South Central West South Central US [Member] West South Central US [Member] Title plants Intangible Assets, Title Plants Intangible Assets, Title Plants FIA embedded derivative Fia Embedded Derivatives [Member] FIA embedded derivatives. Due after five years through ten years, Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Statement [Line Items] Statement [Line Items] Class of Stock [Domain] Class of Stock [Domain] Net decrease in total equity Stockholders' Equity, Period Increase (Decrease) Amortization Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Amortization Measurement Input Type [Domain] Measurement Input Type [Domain] Statement [Table] Statement [Table] Hannover Re Hannover Re [Member] Hannover Re Statistical Measurement [Axis] Statistical Measurement [Axis] Net proceeds from (purchases of) sales and maturities of short-term investment securities Payments for (Proceeds from) Short-term Investments Yield Fair Value Input, Yield Fair Value Input, Yield Weighted Average Weighted Average [Member] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Entity Small Business Entity Small Business Industrial - General Industrial, General [Member] Industrial, General [Member] DSC ratio, amortization period Debt Service Coverage Ratio, Amortization Period Debt Service Coverage Ratio, Amortization Period Contractholder funds Contract Holder Funds [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Amendment Flag Amendment Flag Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Balance at Beginning of Period Balance at End of Period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Subsidiary dividends paid to non-controlling interest shareholders Payments of Ordinary Dividends, Noncontrolling Interest Deferred sales inducements Deferred Sales Inducements, Paid Deferred Sales Inducements, Paid Interest and investment income, including recognized gains and losses Net Investment Income, And Gain (Loss) On Investments Net Investment Income, And Gain (Loss) On Investments Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Financial Instruments [Domain] Financial Instruments [Domain] Investments in Unconsolidated Affiliates Equity Method Investments [Policy Text Block] Statutory capital and surplus Statutory Accounting Practices, Statutory Capital and Surplus, Balance Change in fair value of reinsurance related embedded derivatives Derivative, Gain (Loss) on Derivative, Net Fair Value Measurement [Domain] Fair Value Measurement [Domain] Value of Distribution Asset (VODA) Value of Distribution Asset [Member] Value of Distribution Asset Value of outstanding converted equity awards attributed to services already rendered Business Combination, Consideration Transferred, Other Fair Value, 12 Months or longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Derivatives Financial Instruments Derivatives, Policy [Policy Text Block] Increase (decrease) in statutory capital surplus Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) as a Result of ReDomestication by Entity Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) as a Result of ReDomestication by Entity Deferred sales inducement, unrealized investment gain Deferred Sales Inducement Cost, Unrealized Gain (Loss) on Investment EBITDA Multiple EBITDA Multiple [Member] EBITDA Multiple Schedule of Sources of Net Investment Income Reported Schedule of Sources of Net Investment Income Reported [Table Text Block] Schedule of Sources of Net Investment Income Reported For securities intended/required to be sold prior to recovery of amortized cost basis Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery Ceded Credit Risk [Line Items] Ceded Credit Risk [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Pacific Pacific US [Member] Pacific US [Member] 2018 Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year Dividend Yield Measurement Input, Expected Dividend Rate [Member] F&G acquisition Stock Issued During Period, Value, Acquisitions Income Statement Location [Domain] Income Statement Location [Domain] Stock-based compensation APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition Futures contracts Future [Member] Other Commitments [Line Items] Other Commitments [Line Items] Summary of Reserve for Title Claim Losses F&G Insurance Subsidiary Financial Information and Regulatory Matters Insurance Disclosure [Text Block] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Credit linked note Bank Loan Obligations [Member] Net increase in reserve for title claim losses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Debt Securities, Available-for-sale, Purchased with Credit Deterioration Debt Securities, Available-for-sale, Purchased with Credit Deterioration [Table Text Block] Debt Securities, Available-for-sale, Purchased with Credit Deterioration Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total financial liabilities at fair value Financial Liabilities Fair Value Disclosure Total assets Assets Assets Purchase price Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Purchase Price Deferred Annuities Fixed Annuity [Member] Foreign Governments Debt Security, Government, Non-US [Member] Kim H. Peterson Trustee of the Peterson Family Trust dated April 14 1992 v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman Kim H. Peterson Trustee of the Peterson Family Trust dated April 14 1992 v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman [Member] Kim H. Peterson Trustee of the Peterson Family Trust dated April 14 1992 v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman Provision for title claim losses Policyholder Benefits and Claims Incurred, Net, Other Change in reinsurance liabilities held at fair value resulting from a change in the instrument-specific credit risk, tax benefit (less than for nine months period) Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, Tax Subsequent Event Type [Axis] Subsequent Event Type [Axis] Total Deferred Policy Acquisition Costs and Present Value of Future Profits [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Change in statutory capital surplus Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus Strike Price Measurement Input, Share Price [Member] Customer relationships and contracts Customer relationships and contracts [Member] Customer relationships and contracts Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Commercial mortgage-backed securities Commercial Mortgage Backed Securities [Member] Total liabilities Liabilities Escrow fees Escrow Fees [Member] Escrow Fees [Member] Right to purchase and receive upon exercise in cash (in usd per share) Business Combination, Warrant Conversion Consideration, Ordinary Shares Converted to Right to Purchase and Receive Upon Exercise, Cash Paid Per Share Business Combination, Warrant Conversion Consideration, Ordinary Shares Converted to Right to Purchase and Receive Upon Exercise, Cash Paid Per Share Loan subservicing revenue Fees and Commissions, Mortgage Banking and Servicing Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Purchase Price [Abstract] Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Purchase Price [Abstract] Plaintiffs claim losses amount Loss Contingency, Damages Sought, Value Total Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position Purchase of additional share in consolidated subsidiaries Payments for Repurchase of Redeemable Noncontrolling Interest Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Investment contracts, included in contractholder funds Liabilities Related to Investment Contracts, Fair Value Disclosure DSI DSI [Member] DSI Fair Values, Less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Future policy benefits Liability for Future Policy Benefit, before Reinsurance Net change in other assets and other liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Noncontrolling Interest, Increase from Sale of Parent Equity Interest Increase in additional paid-in-capital and decrease in non controlling interest from increase in ownership percentage in ServiceLink Noncontrolling Interest, Increase from Sale of Parent Equity Interest Additional Paid-in Capital Additional Paid-in Capital [Member] Lease assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Right-of Use Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Right-of Use Assets Change in funds withheld from reinsurers Increase (Decrease) in Reinsurance Payables Asset Class [Axis] Asset Class [Axis] Beginning balance (in shares) Ending balance (in shares) Shares, Issued Net earnings from continuing operations attributable to FNF commons shareholders (in usd per share) Income (Loss) from Continuing Operations, Per Basic Share Total number of available-for-sale securities in an unrealized loss position twelve months or longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Net realized/unrealized gains (losses) on equity securities (2) Gain (Loss) on Sale of Equity Investments Redemption of Servicelink non-controlling interest Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Common stock, shares, outstanding (in shares) Common Stock, Shares, Outstanding Investments in unconsolidated affiliates Equity Method Investments Schedule of Goodwill [Table] Schedule of Goodwill [Table] Broker-quoted Valuation, Market Approach [Member] Revolving Credit Facility Revolving Credit Facility [Member] Real estate technology Real Estate Technology [Member] Real Estate Technology [Member] Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] F&G acquisition Net cash paid for F&G Payments to Acquire Businesses, Net of Cash Acquired Common stock, shares authorized (in shares) Common Stock, Shares Authorized Golub Capital Partners 10, L.P. Golub Capital Partners 10, L.P. [Member] Golub Capital Partners 10, L.P. [Member] Percentage of outstanding equity acquired Business Acquisition, Percentage of Voting Interests Acquired Exercise of stock options Proceeds from Stock Options Exercised Securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Credit Suisse Credit Suisse [Member] Credit Suisse Schedule of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Barclay's Bank Barclays Bank [Member] Barclay's Bank. Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Earnings (Loss) AOCI Attributable to Parent [Member] Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Accrued interest receivable Interest Receivable Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Liabilities, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Tax deferred property exchange income Tax Deferred Property Exchange [Member] Tax Deferred Property Exchange Gross Carrying Value and Weighted Average Useful Lives of Property and Equipment and Other Intangible Assets Acquired Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Debt Security Category [Axis] Debt Security Category [Axis] Investments in unconsolidated affiliates Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, NonCurrent Assets, Equity Method Investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Equity Method Investments Life Insurance Premiums, Insurance and Investment Product Fees, Other Life Insurance Premiums, Insurance and Investment Product Fees, Other [Member] Life Insurance Premiums, Insurance and Investment Product Fees, Other Counterparty Name [Domain] Counterparty Name [Domain] Consolidation Items [Domain] Consolidation Items [Domain] Notes Payable Long-term Debt [Text Block] Greater than 1.00 but less than 1.25 Greater Than One But Less Than One Point Two Five [Member] Greater Than One But Less Than One Point Two Five [Member] Intangibles Goodwill and Intangible Assets Disclosure [Text Block] Mortgage loans Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Mortgage Loans Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Mortgage Loans Available for sale securities, allowance for credit losses Allowance for Expected Credit Losses Balance at Beginning of Period Balance at End of Period Debt Securities, Available-for-sale, Allowance for Credit Loss Total Gross Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Equity in earnings of unconsolidated affiliates Equity in earnings (loss) of unconsolidated affiliates Income (Loss) from Equity Method Investments Earnings from continuing operations before income taxes and equity in earnings of unconsolidated affiliates Earnings (loss) from continuing operations before income taxes and equity in earnings (loss) of unconsolidated affiliates Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Deferrals Unearned Revenue, Additions Unearned Revenue, Additions Hedging Designation [Axis] Hedging Designation [Axis] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Proceeds from issuance of senior notes Proceeds from Issuance of Senior Long-term Debt Shares converted, common and preferred (in shares) Business Combination , Shares Converted, Common and Preferred Stock Business Combination , Shares Converted, Common and Preferred Stock Securities, at fair value Equity securities Equity Securities, FV-NI 5.50% F&G Senior Notes due 2025 5.50% F&G Senior Notes due 2025 [Member] 5.50% F&G Senior Notes due 2025 Entity [Domain] Entity [Domain] Thereafter Present Value Of Future Insurance Profits Amortization Expense After Four Years Present Value Of Future Insurance Profits Amortization Expense After Four Years 2020 (remaining) Long-Term Debt, Maturity, Remainder of Fiscal Year Option cost Fair Value Input Option Cost Fair Value Input Option Cost Earnings (loss) before equity in earnings of unconsolidated affiliates Income (Loss) From Continuing Operations Before Minority Interest And Income (Loss) On Equity Method Investments, Net Of Income Tax Income (Loss) From Continuing Operations Before Minority Interest And Income (Loss) On Equity Method Investments, Net Of Income Tax Goodwill associated with the F&G acquisition Goodwill, Acquired During Period Performing Performing Financial Instruments [Member] Proceeds from Sale of Fixed Maturity Available-for-sale Securities Debt Securities, Available-for-sale [Table Text Block] Less: Comprehensive earnings attributable to non-controlling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Assumed Assumed Premiums Earned Wakefield Capital, LLC, Wakefield Investments, LLC, 2Budz Holding, LLC, Doug and Kristine Heidrich, and Jeff and Heidi Orr v. Chicago Title Co. and Chicago Title Ins. Co. Wakefield Capital, LLC, Wakefield Investments, LLC, 2Budz Holding, LLC, Doug and Kristine Heidrich, and Jeff and Heidi Orr v. Chicago Title Co. and Chicago Title Ins. Co. [Member] Wakefield Capital, LLC, Wakefield Investments, LLC, 2Budz Holding, LLC, Doug and Kristine Heidrich, and Jeff and Heidi Orr v. Chicago Title Co. and Chicago Title Ins. Co. Goodwill [Line Items] Goodwill [Line Items] Insurance Subsidiary Affiliated Entity [Member] Allowance % of Total Loans and Leases Receivable, Allowance, Mortgage Loans, Percentage of Total Loans and Leases Receivable, Allowance, Mortgage Loans, Percentage of Total Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Fixed maturity securities, available for sale Fair value Debt Securities, Available-for-sale Trade and notes receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Change in reinsurance liabilities held at fair value resulting from a change in instrument-specific credit risk Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax Residential mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Derivative, strike price Derivative, Price Risk Option Strike Price Over 90 days past due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Traditional Life Insurance Premiums Life Insurance Product Line [Member] Income taxes receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Income Taxes Receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Income Taxes Receivable Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Assets, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Cash paid for outstanding F&G shares Payments To Acquire Businesses , Including Contingent Consideration Shares Payments to Acquire Businesses , Including Contingent Consideration Shares Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Deferred policy acquisition costs and deferred sales inducements Increase (Decrease) in Deferred Policy Acquisition Costs and Deferred Sales Inducements Increase (Decrease) in Deferred Policy Acquisition Costs and Deferred Sales Inducements Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Earnings per share Net Income Loss Per Common Share Attributable To Controlling Interest [Abstract] Net income (loss) per common share attributable to controlling interest. Decrease in other intangible assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock IUL's Universal Life [Member] Entity Registrant Name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Assets Assets, Fair Value Disclosure [Abstract] Claims paid, net of recoupments related to: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Offered quotes Fair Value Inputs Quoted Prices Fair Value Inputs Quoted Prices Due in one year or less, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Dividends paid Payments of Ordinary Dividends, Common Stock Gross gains Gain on Sale of Investments Equity securities Equity securities Equity Securities [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Investments: Investments [Abstract] Real Estate [Domain] Real Estate [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Investment in unconsolidated affiliates Other Invested Assets [Member] Other Invested Assets [Member] Truist Truist [Member] Truist Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2022 Present Value of Future Insurance Profits, Expected Amortization, Year Two Entity Address, Postal Zip Code Entity Address, Postal Zip Code Net amount recoverable Gain on Business Interruption Insurance Recovery Residential mortgage loans, location percentage Residential Mortgage Loans, Location Percentage Residential Mortgage Loans, Location Percentage Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Consolidated Investments Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Schedule of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Net change in income taxes Increase (Decrease) in Income Taxes Payable Investment expense Investment Income, Investment Expense Other Other Property [Member] Cash dividend per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Aggregate principal amount Debt Instrument, Face Amount Debt issuance costs Debt Issuance Costs, Line of Credit Arrangements, Net Schedule of Goodwill Schedule of Goodwill [Table Text Block] Asset Class [Domain] Asset Class [Domain] Financing Receivable, Nonaccrual Financing Receivable, Nonaccrual [Table Text Block] Equity [Abstract] Equity [Abstract] Total financial assets at fair value Assets, fair value Assets, Fair Value Disclosure Yuan Yu and Polly Yu v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman Yuan Yu and Polly Yu v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman [Member] Yuan Yu and Polly Yu v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman Maturities of Long-term Debt [Abstract] Maturities of Long-term Debt [Abstract] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Estimated Amortization Expense for VOBA in Future Fiscal Periods Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Weighted average shares outstanding FNF common stock, diluted basis (in shares) Weighted Average Number of Shares Outstanding, Diluted Liabilities, Net transfer In (Out) of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net FIA embedded derivatives, included in contractholder funds Fixed indexed annuities Fixed Index Annuity [Member] Fixed index annuity. Debt Disclosure [Abstract] Debt Disclosure [Abstract] Limited partnerships Limited Partnership [Member] Limited Partnership [Member] Unsecured notes Unsecured Debt [Member] Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Debt service payments Repayment of principal borrowed Repayments of Long-term Debt Credit Linked Note Credit Linked Note [Member] Credit Linked Note [Member] Net Policyholder Benefits and Claims Incurred, Net Counterparty Name [Axis] Counterparty Name [Axis] Investments by Consolidated and Nonconsolidated Entities [Domain] Investments by Consolidated and Nonconsolidated Entities [Domain] FNF common stock, $0.0001 par value; authorized 600,000,000 shares as of September 30, 2020 and December 31, 2019; outstanding of 293,649,504 and 275,563,436 as of September 30, 2020 and December 31, 2019, respectively, and issued of 320,759,086 and 292,236,476 as of September 30, 2020 and December 31, 2019, respectively Common Stock, Value, Issued Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus Deferred tax asset Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Other long-term investments Other Long-term Investments Change in reinsurance recoverable Change in reinsurance recoverable Increase (Decrease) in Reinsurance Recoverable Entity Current Reporting Status Entity Current Reporting Status Available-for-sale Securities Available-for-sale Securities [Member] Liabilities, Total Gains (Losses) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Derivatives: Derivative Asset [Abstract] Mountain Mountain [Member] Mountain [Member] Total net consideration paid Business Combination, Consideration Transferred, Net Business Combination, Consideration Transferred, Net Debt-to-Value [Axis] Debt-to-Value [Axis] Purchases of investment securities Payments to Acquire Debt Securities, Available-for-sale Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Comprehensive earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Term of contract, term two Derivative, Term of Contract, Term Two Derivative, Term of Contract, Term Two Charges assessed to contractholders for mortality and admin Charges Assessed To Contract Holders For Mortality And Administration Mortality and expense charges and administrative fees. Common stock, shares, issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents, at September 30, 2020 and December 31, 2019 includes $389 and $384, respectively, of pledged cash related to secured trust deposits Cash and Cash Equivalents, at Carrying Value Benefits and Other Changes in Insurance Policy Reserves: Policyholder Benefits and Claims Incurred [Abstract] Lease liabilities Operating Lease, Liability Trade receivables Accounts Receivable, after Allowance for Credit Loss Segment Reporting [Abstract] Debt Instrument [Line Items] Debt Instrument [Line Items] Interest crediting rates for funds at subsidiaries Interest Crediting Rates for Funds at Subsidiaries Interest Crediting Rates for Funds at Subsidiaries Total Fidelity National Financial, Inc. shareholders’ equity Stockholders' Equity Attributable to Parent Consideration transferred Business Combination, Consideration Transferred Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Consideration transferred (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Deferrals Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Addition Entity Address, City or Town Entity Address, City or Town Change in allowance for expected credit losses Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Company-owned life insurance Bank Owned Life Insurance Other assets Other Assets [Member] Financial Instrument [Axis] Financial Instrument [Axis] Structured hybrids Structured Hybrids [Member] Structured hybrids. Commercial mortgage loans Investments, Commercial Mortgage Loans, Fair Value Disclosure Fair value of the investment commercial mortgage loan portfolio Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Realized losses on other invested assets Gain (Loss) on Sale of Other Investments Investment yield assumptions Long-Duration Contracts, Assumptions by Product and Guarantee, Estimated Average Investment Yield Liabilities: Liabilities [Abstract] Assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets Ceded Credit Risk [Table] Ceded Credit Risk [Table] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Provision for title insurance claim losses as a percentage of title insurance premiums Provision For Title Insurance Claims on Current Year Policies Provision For Title Insurance Claims on Current Year Policies Kim Funding, LLC, Kim H. Peterson, Joseph J. Cohen, and ABC Funding Strategies, LLC v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman Kim Funding, LLC, Kim H. Peterson, Joseph J. Cohen, and ABC Funding Strategies, LLC v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman [Member] Kim Funding, LLC, Kim H. Peterson, Joseph J. Cohen, and ABC Funding Strategies, LLC v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman Term Loan Credit Agreement Term Loan Credit Agreement [Member] Term Loan Credit Agreement Available-for-sale securities Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Unrealized (loss) gain on investments in unconsolidated affiliates Other comprehensive earnings - unrealized gain (loss) on investments in unconsolidated affiliates Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Net Of Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Net Of Tax Investment, Name [Domain] Investment, Name [Domain] Other comprehensive earnings Other Comprehensive Income (Loss), Net of Tax FIA embedded derivatives, included in contractholder funds Embedded Derivatives Included In Contractholder Funds [Member] Embedded derivatives, included in contractholder funds. Reclassification adjustments for change in unrealized gains and losses included in net earnings, tax expense (less than for nine month periods) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Equity financing associated with the acquisition of F&G Noncash or Part Noncash Acquisition, Equity Financing Noncash or Part Noncash Acquisition, Equity Financing Due after ten years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Due after one year through five years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five FGL FGL [Member] FGL [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Effects of Reinsurance [Table] Effects of Reinsurance [Table] Goodwill Goodwill Disclosure [Text Block] Gross investment income Gross Investment Income, Operating DH Claims LLC v. Chicago Title Co., Chicago Title Ins. Co., and Della Ducharme DH Claims LLC v. Chicago Title Co., Chicago Title Ins. Co., and Della Ducharme [Member] DH Claims LLC v. Chicago Title Co., Chicago Title Ins. Co., and Della Ducharme Unlocking Deferred Policy Acquisition Costs and Present Value of Future Profits, Unlocking Adjustment Deferred Policy Acquisition Costs and Present Value of Future Profits, Unlocking Adjustment For securities sold during the period Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold 2016 Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year Equity: Stockholders' Equity Attributable to Parent [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Non-performance spread Fair Value Inputs Non Performance Spread Fair Value Inputs Non Performance Spread Summary of the Effect of the Change in Ownership Percentage in ServiceLink Schedule of Stockholders Equity [Table Text Block] Other long-term investments Other Long-term Investments [Member] Entity Filer Category Entity Filer Category Common Stock Equity securities Common Stock [Member] Wilton Reassurance Company Wilton Reassurance Company [Member] Wilton reassurance company. Product and Service [Domain] Product and Service [Domain] Distributions from unconsolidated affiliates, return of investment Proceeds from Equity Method Investment, Distribution, Return of Capital Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Reinsurance retention policy, amount retained Reinsurance Retention Policy, Amount Retained Other Commitments [Axis] Other Commitments [Axis] Net realized gains on fixed maturity available-for-sale securities Gain (Loss) on Sale of Debt Investments Revenue Recognition, Services, Real Estate Transactions Revenue Recognition, Services, Real Estate Real Estate Transactions [Policy Text Block] Revenue Recognition, Services, Real Estate Real Estate Transactions Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Unlocking Unearned Revenue, Unlocking Adjustment Unearned Revenue, Unlocking Adjustment Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Commitment to Invest Commitment to Invest [Member] Commitment to Invest [Member] Total Financing Receivable, before Allowance for Credit Loss Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Diluted Earnings Per Share, Diluted [Abstract] Contractholder funds Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liability, Policy Holder Account Balances Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liability, Policy Holder Account Balances Exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Unrealized investment gain (losses) Unearned Revenue, Unrealized Gain (Loss) on Investment Unearned Revenue, Unrealized Gain (Loss) on Investment Third-Party Valuation Third Party Valuation Technique [Member] Third Party Valuation Technique [Member] Net increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Acquisitions Business Combination Disclosure [Text Block] Direct Policyholder Benefits and Claims Incurred, Direct Fixed maturity securities available-for-sale: Debt Securities, Available-for-sale [Abstract] Expenses: Costs and Expenses [Abstract] Writeoffs charged against the allowance Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff Total number of available-for-sale securities in an unrealized loss position Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Unrealized gain (loss) on foreign currency translation Other comprehensive earnings - unrealized loss on foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Treasury stock (in shares) Treasury Stock, Shares Interest Unearned Revenue Interest Expense Unearned Revenue Interest Expense Cumulative adjustments for net unrealized investment gains Cumulative Adjustments For Net Unrealized Investment Gains Cumulative adjustments for net unrealized investment gains. Other derivatives and embedded derivatives Embedded derivatives Embedded Derivative Financial Instruments [Member] Ownership [Domain] Ownership [Domain] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Direct title insurance premiums Insurance Contracts, Direct Title Insurance Premiums [Member] Insurance Contracts, Direct Title Insurance Premiums [Member] Total equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total revenues Revenues Current year Current Year Claims and Claims Adjustment Expense Class of Stock [Axis] Class of Stock [Axis] Income taxes Income Taxes Paid, Net Total Mortgage Loans Total Mortgage Loans [Member] Total Mortgage Loans [Member] Residential mortgage loans Residential Mortgage [Member] Liabilities, fair value Financial and Nonfinancial Liabilities, Fair Value Disclosure Net earnings per share attributable to FNF common shareholders, diluted (in usd per share) Earnings Per Share, Diluted Proceeds from sales of investment securities Proceeds from Sale of Debt Securities, Available-for-sale Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Value of FNF share consideration Business Combination, Consideration Transferred, Equity Interests Issued and Issuable CalPrivate Bank v. Kim H. Peterson Trustee of the Peterson Family Trust dated April 14 1992 CalPrivate Bank v. Kim H. Peterson Trustee of the Peterson Family Trust dated April 14 1992 [Member] CalPrivate Bank v. Kim H. Peterson Trustee of the Peterson Family Trust dated April 14 1992 Schedule of Notes Payable Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Investment in Mortgage Loans by Loan to Value and Debt Service Coverage Ratios Schedule of Investment in Mortgage Loans by Loan to Value and Debt Service Coverage Ratios [Table Text Block] Tabular disclosure of investments in loans separated by loan to value (LTV) and debt service coverage ratios (DSCR). Entity Address, Address Line One Entity Address, Address Line One Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Indefinite-lived, cost Indefinite-lived Intangible Assets (Excluding Goodwill) FGL's Exposure to Credit Loss on Call Options Held Schedule Of Exposure To Credit Loss On Derivative Instrument Table [Table Text Block] Schedule of exposure to credit loss on derivative instrument. Realized gains on certain derivative instruments Gain (Loss) on Sale of Derivatives Total revenues Business Acquisition, Pro Forma Revenue Amended Revolving Credit Facility Amended Revolving Credit Facility to October 2025 [Member] Amended Revolving Credit Facility to October 2025 Total liability derivatives Derivative Liability, Fair Value, Gross Liability Treasury rates Fair Value Inputs, Treasury Rates Fair Value Inputs, Treasury Rates Deutsche Bank Deutsche Bank [Member] Deutsche Bank. Ceded Policyholder Benefits and Claims Incurred, Ceded Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Maximum Maximum [Member] Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Non-controlling Interest Noncontrolling Interest [Member] Recognized gains and losses, net Recognized gains and losses, net Gain (Loss) on Investments (Additions) reductions in allowance recorded on previously impaired securities Debt Securities, Available-for-sale, Change in Present Value, Expense (Reversal) Dividends declared, per common share Dividends, Common Stock, Cash Invested cash and short-term investments Invested Cash And Short Term Investments [Member] Invested cash and short-term investments. Claim loss provision related to: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Revenues from external customers Insurance Services Revenue Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Allowance for credit losses at acquisition Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Change in purchases of investments available for sale payable in period Noncash Investing and Financing Activities, Change in Purchases of Investments Noncash Investing and Financing Activities, Change in Purchases of Investments Investments [Domain] Investments [Domain] 2017 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year Total non-accrual loans Loans at Amortized Cost, Nonaccrual Loans at Amortized Cost, Nonaccrual Trading Symbol Trading Symbol Susan Heller Fenley Separate Property Trust, Susan Heller Fenley Inherited Roth IRA, Shelley Lynn Tarditi Trust and ROJ, LLC v. Chicago Title Co., Chicago Title Ins. Co. et al Susan Heller Fenley Separate Property Trust, Susan Heller Fenley Inherited Roth IRA, Shelley Lynn Tarditi Trust and ROJ, LLC v. Chicago Title Co., Chicago Title Ins. Co., [Member] Susan Heller Fenley Separate Property Trust, Susan Heller Fenley Inherited Roth IRA, Shelley Lynn Tarditi Trust and ROJ, LLC v. Chicago Title Co., Chicago Title Ins. Co., Debt costs/equity issuance additions Payment of Financing and Stock Issuance Costs Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Summary of the Reserve for Claim Losses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Entity Shell Company Entity Shell Company Retail Retail Site [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Schedule of Residential Mortgage Loans by State Schedule of Residential Mortgage Loans by Geographic Location [Table Text Block] Schedule of Residential Mortgage Loans by Geographic Location South Atlantic South Atlantic US [Member] South Atlantic US [Member] Balance at beginning of period Balance at end of period Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities Embedded Derivatives in Reinsurance Contracts [Member] Embedded Derivatives in Reinsurance Contracts [Member] Document Type Document Type Assets of discontinued operations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets of Discontinued Operations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets of Discontinued Operations Mark Atherton, et al., v. Chicago Title Co. and Chicago Title Ins. Co. Mark Atherton, et al., v. Chicago Title Co. and Chicago Title Ins. Co. [Member] Mark Atherton, et al., v. Chicago Title Co. and Chicago Title Ins. Co. Beginning balance Ending balance of claim loss reserve for title insurance Liability for Claims and Claims Adjustment Expense Treasury Stock Treasury Stock [Member] Number of policies reinsured by foreign company not engaged in insurance Number of Policies Reinsured by Foreign Company Not Engaged in Insurance Number of Policies Reinsured by Foreign Company Not Engaged in Insurance Segments [Axis] Segments [Axis] Change in Unrealized Incl in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Unrealized Gain (Loss) Included in Other Comprehensive Income (Loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Unrealized Gain (Loss) Included in Other Comprehensive Income (Loss) Level 3 Fair Value, Inputs, Level 3 [Member] Randolph L. Levin, et al., v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, Betty Elixman, et al Randolph L. Levin, et al., v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, Betty Elixman, et al [Member] Randolph L. Levin, et al., v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, Betty Elixman, et al Derivative investments Derivative Asset Total fixed maturities Fixed Maturities [Member] Due after one year through five years, Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Line of Credit Line of Credit [Member] Total Assets, carried on Balance Sheet at amounts other than fair value Assets, carried on Balance Sheet at amounts other than fair value Deferred tax liability Deferred Income Tax Liabilities, Net Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Intangibles, net Intangible Assets, Net (Excluding Goodwill) PVFP PVFP [Member] PVFP Total fixed maturity available-for-sale securities, Fair Value Available For Sale Securities Fair Value On Debt Maturities Available for sale securities fair value on debt maturities. Other securities which provide for periodic payments, Fair Value Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Trade names Trademarks and Trade Names [Member] Call options Call Option [Member] Information about Trade Receivables and Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Investments by Consolidated and Nonconsolidated Entities [Axis] Investments by Consolidated and Nonconsolidated Entities [Axis] Unearned revenue liability Unearned Revenue, Net Unearned Revenue, Net Variable Rate [Axis] Variable Rate [Axis] Other investments Other Investments Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Commitments and Contingencies Commitments and Contingencies Purchases of treasury stock Payments for Repurchase of Common Stock Entity Address, State or Province Entity Address, State or Province Reinsurance Reinsurance Accounting Policy [Policy Text Block] Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Axis] Other Commitments [Table] Other Commitments [Table] Retained earnings Retained Earnings (Accumulated Deficit) Repayments of all outstanding indebtedness under term loan credit agreement Repayments of Lines of Credit Lease assets Operating Lease, Right-of-Use Asset Expected credit losses on reinsurance recoverable Reinsurance Recoverable, Allowance for Credit Loss ServiceLink, excluding title premiums, escrow fees, and subservicing fees ServiceLink, Excluding Title Premiums, Escrow Fees And Subservicing Fees [Member] ServiceLink, Excluding Title Premiums, Escrow Fees And Subservicing Fees [Member] Additions to property and equipment and capitalized software Payments To Acquire Property, Plant, and Equipment and Software Payments To Acquire Property, Plant, and Equipment and Software Hotel Hotel [Member] New England New England [Member] New England [Member] Changes in Fair Value of Financial Instruments - Assets Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Non-income producing investment fair value Investment, Non-Income Producing, Fair Value Disclosure Investment, Non-Income Producing, Fair Value Disclosure Other securities which provide for periodic payments, Amortized Cost Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Equity securities Equity Securities, FV-NI, Measurement Input Hedging Designation [Domain] Hedging Designation [Domain] Additional investments in unconsolidated affiliates Payments to Acquire Equity Method Investments Net loss from discontinued operations attributable to FNF common shareholders (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Activity in Allowance for Credit Loses of Available-for-sale Securities Aggregated by Investment Category Debt Securities, Available-for-sale, Allowance for Credit Loss [Table Text Block] ServiceLink Holdings, LLC ServiceLink Holdings, LLC [Member] ServiceLink Holdings, LLC [Member] Collateral held Collateral Already Posted, Aggregate Fair Value Current (less than 30 days past due) Financial Asset, 1 to 29 Days Past Due [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Net other investing activities Payments for (Proceeds from) Other Investing Activities Change in Unrealized Incl in OCI Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Risk margin to reflect uncertainty Risk Margin To Reflect Uncertainty Risk Margin To Reflect Uncertainty Liability Class [Axis] Liability Class [Axis] 2020 Present Value of Future Insurance Profits, Expected Amortization, Remainder of Fiscal Year Revenue from contract with customer Revenue from Contract with Customer, Excluding Assessed Tax Investment Securities Investment, Policy [Policy Text Block] Real estate brokerage Reat Estate Brokerage [Member] Reat Estate Brokerage [Member] Policy period Contract With Customer, Policy Period Contract With Customer, Policy Period Assets, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Recapture period Reinsurance, Recapture Period Reinsurance, Recapture Period Business Acquisition [Axis] Business Acquisition [Axis] Geographical [Domain] Geographical [Domain] 2024 Present Value of Future Insurance Profits, Expected Amortization, Year Four Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] F&G acquisition (in shares) Stock Issued During Period, Shares, Acquisitions Change in valuation of equity and preferred securities, net Unrealized Gain (Loss) on Investments Draw on revolving credit facility Proceeds from Long-term Lines of Credit Prepaid expenses and other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Adjustment for net unrealized investment gains Present Value of Future Insurance Profits, Unrealized Gain (Loss) on Investment Goldman Sachs Goldman Sachs [Member] Goldman Sachs [Member] Investment owned, at fair value Investment Owned, at Fair Value Fair value of future policy benefits Future Policy Benefits, Fair Value Future Policy Benefits, Fair Value F&G Reinsurance Reinsurance [Text Block] Credit Facility [Axis] Credit Facility [Axis] Debt instrument Debt Instrument, Fair Value Disclosure Due after ten years, Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued 5.50% F& G Notes 5.50% F& G Notes [Member] 5.50% F& G Notes U.S. Government US Government Agencies Debt Securities [Member] Loans Segregated by Risk Rating Exposure Financing Receivable Credit Quality Indicators [Table Text Block] Business Combinations [Abstract] Business Combinations [Abstract] Reserve for title claim losses Liability for Unpaid Claims and Claims Adjustment Expense, Net Pro forma net earning (loss) Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Commercial Portfolio Segment Commercial Portfolio Segment [Member] Investment in unconsolidated affiliates Equity Method Investments [Member] Derivatives For Trading And Investment Derivatives For Trading And Investment [Member] Derivatives For Trading And Investment [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Debt offering Proceeds from Issuance of Common Stock LTV 50 to 60 Percent LTV 50 to 60 Percent [Member] Loan-to-value (LTV) ratio from 50 to 60%. Goodwill [Roll Forward] Goodwill [Roll Forward] Number of instruments held Derivative, Number of Instruments Held Financial Asset, Period Past Due [Domain] Financial Asset, Period Past Due [Domain] Allowance for expected credit loss Allowance for expected loan loss Loans and Leases Receivable, Allowance Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Schedule of Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Wells Fargo Wells Fargo [Member] Wells Fargo [Member] 2.45% Notes, net of discount Notes 2.45% [Member] Notes 2.45% Other investments Other Investments [Member] Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Liabilities, Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Prior years Prior Year Claims and Claims Adjustment Expense Entity Central Index Key Entity Central Index Key Related Party [Domain] Related Party [Domain] Software Computer Software, Intangible Asset [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Summary of Changes Intangible Assets, VOBA and DAC DSI Schedule of Finite-Lived Intangible Assets [Table Text Block] Liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities Total expenses Benefits, Losses and Expenses Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Debt Service Coverage Ratio [Axis] Debt Service Coverage Ratio [Axis] Debt Service Coverage Ratio Geographical [Axis] Geographical [Axis] Segments [Domain] Segments [Domain] Amortized Cost Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Net earnings attributable to FNF common shareholders Business Acquisition, Pro Forma Net Income (Loss) 2024 Long-Term Debt, Maturity, Year Four Non-performing Nonperforming Financial Instruments [Member] Assets, Total Gains (Losses) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Amortization expense Unearned Revenue, Amortization Expense Unearned Revenue, Amortization Expense Income Statement Location [Axis] Income Statement Location [Axis] F&G Acquisition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Business Combinations Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Business Combinations Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Assumed Policyholder Benefits and Claims Incurred, Assumed Remeasurement of lease liabilities Lessee, Operating Lease, Remeasurement Of Lease Liability Lessee, Operating Lease, Remeasurement Of Lease Liability Number of shares in which statutory appraisal rights have been claimed (in shares) Loss Contingency, Number Of Shares In Which Asserted Statutory Appraisal Rights Have Been Claimed Loss Contingency, Number Of Shares In Which Asserted Statutory Appraisal Rights Have Been Claimed Notional Amount Derivative, Notional Amount Contractholder account deposits Proceeds from Annuities and Investment Certificates % of Total Commercial Mortgage Receivable, Percentage of Total Percentage of the total commercial loan portfolio. Debt Service Coverage Ratio [Domain] Debt Service Coverage Ratio [Domain] Debt Service Coverage Ratio Cash, pledged, secured trust deposits Cash, Pledged, Customer Advances And Deposits Cash, Pledged, Customer Advances And Deposits Segment Information Segment Reporting Disclosure [Text Block] Available-for-sale securities, pledged securities, secured trust deposits Debt Securities, Available-for-sale Securities, Pledged, Customer Advances And Deposits Debt Securities, Available-for-sale Securities, Pledged, Customer Advances And Deposits Total loans that are 90 days past due and still accruing Financing Receivable, 90 Days or More Past Due, Still Accruing Total Liabilities, carried on Balance Sheet at amounts other than fair value Liabilities, carried on Balance Sheet at amounts other than fair value Title of 12(b) Security Title of 12(b) Security Subtotal, Amortized Cost Available For Sale Securities Debt Maturities Amortized Cost Excluding Single Maturity Date Available for sale securities debt maturities amortized cost excluding single maturity date. Net carrying amount Finite-Lived Intangible Assets, Net Middle Atlantic Middle Atlantic US [Member] Middle Atlantic US [Member] Unpaid Principal Balance Carrying Value Loans Receivable, Gross, Mortgage Loans Loans Receivable, Gross, Mortgage Loans Unrealized gain on investments and other financial instruments, net of adjustments to intangible assets and unearned revenue (excluding investments in unconsolidated affiliates) OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Unrealized gain on investments and other financial instruments, tax expense OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Other long-term investments Other Assets, Fair Value Disclosure Reinsurance recoverable, net of allowance for credit losses of $22 at September 30, 2020 Reinsurance Recoverables, Including Reinsurance Premium Paid Interest expense Interest Expense Income tax expense as percentage of earnings before income taxes, percent Income Tax Expense As Percentage Of Earnings Before Income Taxes, Percent Income Tax Expense As Percentage Of Earnings Before Income Taxes, Percent Depreciation and amortization Depreciation, Depletion and Amortization Redeemable non-controlling interest, ownership percentage Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Net investment (losses) gains Net Realized Investment Gains [Member] Net Realized Investment Gains [Member] Product and Service [Axis] Product and Service [Axis] Market value of fund Fair Value Inputs Black Scholes Model Fair Value Inputs Black Scholes Model Purchase of outstanding Class A units of minority owners Payments to Acquire Businesses and Interest in Affiliates Investment Type [Axis] Investment Type [Axis] Insurance [Abstract] Insurance [Abstract] IOWA IOWA Temporary Equity Temporary Equity [Table Text Block] Supplemental Cash Flow Elements [Abstract] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] 2022 Long-Term Debt, Maturity, Year Two Revenue recognized Contract with Customer, Liability, Revenue Recognized Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Increase in deferred tax liability Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Assets Net change in secured trust deposits Payments For (Proceeds From) Secured Trust Deposits Payments For (Proceeds From) Secured Trust Deposits Non-cash lease costs Operating Lease, Expense Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Short term investments Short-term Investments, Fair Value Short-term Investments, Fair Value Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Non-permitted statutory accounting practices Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus FHLB common stock FHLB Common Stock, Fair Value FHLB Common Stock, Fair Value Allowance for credit loss Beginning Balance Ending Balance Financing Receivable, Allowance for Credit Loss Unrealized gains on certain derivative instruments Unrealized Gain (Loss) on Derivatives Debt Instrument [Axis] Debt Instrument [Axis] Future policy benefits Future Policy Benefits [Member] Future Policy Benefits [Member] Schedule of Initial Purchase Price Schedule of Business Acquisitions, by Acquisition [Table Text Block] Operating Segments Operating Segments [Member] Redemption of Servicelink non-controlling interest Temporary Equity, Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Temporary Equity, Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Class of Stock [Line Items] Class of Stock [Line Items] Treasury stock repurchased Treasury Stock, Value, Acquired, Cost Method Crescent Capital BDC Inc. Crescent Capital BDC Inc. [Member] Crescent Capital BDC Inc. [Member] Derivative liability Derivative Liability Adjustments to reconcile net earnings to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Total number of available-for-sale securities in an unrealized loss position less than twelve months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Insurance contracts Insurance Contracts [Member] Insurance Contracts [Member] Litigation Case [Axis] Litigation Case [Axis] Revenue from Contract with Customer [Abstract] Total title claims paid, net of recoupments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Schedule of Investments [Line Items] Schedule of Investments [Line Items] Ovation Fin. Holdings 2 LLC, Ovation Fund Mgmt. II, LLC, Banc of California, N.A. v. Chicago Title Ins. Co., Chicago Title Co. Ovation Fin. Holdings 2 LLC, Ovation Fund Mgmt. II, LLC, Banc of California, N.A. v. Chicago Title Ins. Co., Chicago Title Co., Case No. 3:19-cv-02031-GPC-KSC [Member] Ovation Fin. Holdings 2 LLC, Ovation Fund Mgmt. II, LLC, Banc of California, N.A. v. Chicago Title Ins. Co., Chicago Title Co., Case No. 3:19-cv-02031-GPC-KSC [Member] Notes payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt Subsequent Event Subsequent Event [Member] F&G Acquisition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Business Combinations Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Business Combinations Hybrids Hybrids [Member] Hybrids. Interest credited/index credits to contractholder account balances Interest Credited to Policy Owner Account Home warranty Insurance Contracts, Home Warranty [Member] Insurance Contracts, Home Warranty [Member] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Interest Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Periodic Amortization Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Periodic Amortization All Other States All Other States [Member] All Other States [Member] Fair Value Estimate of Fair Value Measurement [Member] Short-term investments, at September 30, 2020 and December 31, 2019 includes pledged short-term investments of $4 and $12, respectively, related to secured trust deposits Other Short-term Investments Schedule of Loans with Credit Quality Indicators, Performing or Nonperforming Schedule of Loans with Credit Quality Indicators, Performing or Nonperforming [Table Text Block] Schedule of Loans with Credit Quality Indicators, Performing or Nonperforming Other intangible assets Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Income-Approach Valuation, Income Approach [Member] New Jersey NEW JERSEY Total title claim loss provision Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Commercial mortgage loans Commercial Mortgage Loan [Member] Commercial Mortgage Loan [Member] Goodwill expected to be tax deductible Business Acquisition, Goodwill, Expected Tax Deductible Amount Residential mortgage-backed securities Residential Mortgage Backed Securities [Member] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Subsegments [Domain] Subsegments [Domain] Comprehensive earnings attributable to Fidelity National Financial, Inc. common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Preferred stock, par or stated value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share 2021 Long-Term Debt, Maturity, Year One Legal Entity [Axis] Legal Entity [Axis] City Area Code City Area Code Change in fair value of other derivatives and embedded derivatives Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Document Period End Date Document Period End Date Less than 1.00 Less Than One Point Zero Zero [Member] Less Than One Point Zero Zero Term Loan Term Loan [Member] Term Loan Net earnings Net earnings Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Assets, Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Total commercial mortgage loans Loans and Leases Receivable, Net Amount Funds withheld for reinsurance liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Funds Withheld for Reinsurance Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Funds Withheld for Reinsurance Liabilities Lease liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Lease Liability Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Lease Liability Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Stock-based compensation cost Share-based Payment Arrangement, Noncash Expense Unrealized gain on investments in unconsolidated affiliates tax (benefit) expense Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Tax Term of contract, term three Derivative, Term of Contract, Term Three Derivative, Term of Contract, Term Three Cover [Abstract] Cover [Abstract] Measurement Input Type [Axis] Measurement Input Type [Axis] Fixed maturity securities, available-for-sale, at fair value (amortized cost: September 30, 2020 - $25,178; December 31, 2019 - $2,029 and allowance for expected credit losses: September 30, 2020 - $701; December 31, 2019 - $0) Debt Securities, Trading For initial credit losses on purchased securities accounted for as PCD financial assets Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase Accounts payable and accrued liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Distributions from unconsolidated affiliates, return on investment Proceeds from Equity Method Investment, Distribution Other title-related fees and income Other Title Related Fees And Income [Member] Other Title Related Fees And Income [Member] Income taxes payable Taxes Payable Corporate and Other Corporate and other Corporate And Reconciling Items [Member] Corporate And Reconciling Items [Member] Notes payable Debt Long-term Debt Total investments Investments Fixed maturity securities Fixed maturity securities, available-for-sale Debt Securities [Member] Balance at Beginning of Period Balance at End of Period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value California CALIFORNIA F&G FGL Holdings [Member] FGL Holdings [Member] Reclassification adjustments for change in unrealized gains and losses included in net earnings Reclassification adjustments for change in unrealized gains and losses included in net earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 30-89 days past due Financial Asset, 30 to 89 Days Past Due [Member] Financial Asset, 30 to 89 Days Past Due Equity Components [Axis] Equity Components [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Minimum Minimum [Member] Title premiums Premiums Written, Net Balance Sheet Location [Domain] Balance Sheet Location [Domain] Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Schedule of Supplemental Cash Flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Funds withheld for reinsurance liabilities Funds Held under Reinsurance Agreements, Liability West North Central West North Central US [Member] West North Central US [Member] Less: Net earnings attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Ceded Ceded Premiums Earned Asset-backed securities Asset-backed Securities [Member] Entity Interactive Data Current Entity Interactive Data Current United States UNITED STATES Revenues: Revenues [Abstract] Valuation (losses) gains Equity Securities, FV-NI, Valuation Gain (Loss) Equity Securities, FV-NI, Valuation Gain (Loss) For initial credit losses on purchased loans accounted for as PCD financial assets Provision for Other Credit Losses Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Dividends Net Income Attributable to FNF Common Shareholders and Change in Total Equity Stockholders' Equity Note Disclosure [Text Block] Fair Value and Gross Unrealized Losses of Available-for-sale Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Proceeds from calls and maturities of investment securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale 5.50% Notes Due September 2022 5.50% Notes, net of discount Five Point Five Zero Percent Unsecured Notes Due September 2022 [Member] Five Point Five Zero Percent Unsecured Notes Due September 2022 [Member] Effect of Reinsurance on Premiums Earned, Benefits Incurred and Reserve Changes Schedule Of Effect Of Reinsurance On Premiums Earned And Benefits Incurred And Reserve Changes Table [Table Text Block] Schedule of effect of reinsurance on premiums earned and benefits incurred and reserve changes. F&G F&G Segment [Member] F&G Segment Derivative [Table] Derivative [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] Assets, Net transfer In (Out) of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Other operating expenses Other Cost and Expense, Operating Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Schedule of Investments [Table] Schedule of Investments [Table] Life and Annuity Insurance Product Line Life and Annuity Insurance Product Line [Member] Future policy benefits, nonperformance risk spread Future Policy Benefits, Nonperformance Risk Spread [Member] Future Policy Benefits, Nonperformance Risk Spread [Member] Fixed maturity securities, available-for-sale Fixed Maturities Available For Sale [Member] Fixed Maturities Available For Sale [Member] Allowance for doubtful accounts, premiums and other receivables Allowance for Doubtful Accounts, Premiums and Other Receivables Interest and investment income Net investment income Net Investment Income Annual interest rate Debt Instrument, Interest Rate, Effective Percentage Consolidation Items [Axis] Consolidation Items [Axis] Debt Covenant Terms [Domain] Debt Covenant Terms [Domain] [Domain] for Debt Covenant Terms [Axis] East North Central East North Central US [Member] East North Central US [Member] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Title Title Segment [Member] Title Segment Other invested assets Investments, Affiliated Bank Loan, Fair Value Disclosure Investments, Affiliated Bank Loan, Fair Value Disclosure 2021 Present Value of Future Insurance Profits, Expected Amortization, Year One Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Office Office Building [Member] Trade and notes receivables, net of allowance of $28 and $20 at September 30, 2020 and December 31, 2019, respectively Accounts and Financing Receivable, after Allowance for Credit Loss 3.40% Notes due June 15, 2030 3.40% Notes due June 15, 2030 [Member] 3.40% Notes due June 15, 2030 Industrial - Warehouse Warehouse [Member] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Due in one year or less, Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Effects of Reinsurance [Line Items] Effects of Reinsurance [Line Items] Document Transition Report Document Transition Report Assets held by insurance regulators Assets Held by Insurance Regulators Gross Unrealized Losses, 12 months or longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Price as percent of par on offering of unsecured Notes Price As Percent Of Par On Offering Of Unsecured Notes Price As Percent Of Par On Offering Of Unsecured Notes Total asset derivatives Fair Value Derivative Asset, Fair Value, Gross Asset Policy loans Policy Loans, Fair Value Policy Loans, Fair Value Debt Covenant Terms [Axis] Debt Covenant Terms [Axis] Debt Covenant Terms [Axis] Due after five years through ten years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Level 2 Fair Value, Inputs, Level 2 [Member] Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Document Quarterly Report Document Quarterly Report Revolving Credit Facility Revolving Credit Facility Due April 2022 Revolving Credit Facility Due April 2022 [Member] Revolving Credit Facility Due April 2022 [Member] Liabilities Liabilities, Fair Value Disclosure [Abstract] Maximum amount of loss due to credit risk Net Credit Risk Derivative Asset, Fair Value, Amount Offset Against Collateral Net loss from discontinued operations attributable to FNF common shareholders (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Subsequent Event [Line Items] Subsequent Event [Line Items] Credit Facility [Domain] Credit Facility [Domain] Florida FLORIDA Litigation Case [Domain] Litigation Case [Domain] Net earnings per share attributable to FNF common shareholders, basic (in usd per share) Earnings Per Share, Basic Subtotal, Fair Value Available For Sale Securities Debt Maturities Fair Value Excluding Single Maturity Date Available for sale securities debt maturities fair value excluding single maturity date. Loan to value, threshold (less than) Loan to Value, Maximum Threshold Highest loan to value ratio present in the loan portfolio. Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Entity File Number Entity File Number VOBA Voba [Member] VOBA. B I S A Co Invest Fund I I L. P. B I S A Co Invest Fund I I L. P. [Member] B I S A Co Invest Fund I I L. P. Net loss from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Available-for-sale embedded derivative Available For Sale Embedded Derivatives [Member] Available-for-sale embedded derivatives. Balance Sheet Location [Axis] Balance Sheet Location [Axis] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Contractholder account withdrawals Repayments of Annuities and Investment Certificates Term of contract, term four Derivative, Term of Contract, Term Four Derivative, Term of Contract, Term Four Escrow, title-related and other fees Insurance Commissions and Fees Schedule of Distribution of CMLs, Gross Valuation by Property Type and Geographic Region Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Volatility Measurement Input, Price Volatility [Member] % of Total Residential Mortgage Receivable, Percentage of Total Percentage of the total residential loan portfolio Proceeds from repayments of Cannae Holdings Inc. note receivable Repayment of Notes Receivable from Related Parties Subsequent Event [Table] Subsequent Event [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Terminated credit facility Line Of Credit Facility, Terminated Line Of Credit Facility, Terminated Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Redeemable non-controlling interest by 21% minority holder of ServiceLink Holdings, LLC (see Note R) Beginning Balance Ending Balance Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Estimated litigation liability Estimated Litigation Liability Interest accrual rate utilized to calculate accretion of interest Value of Business Acquired, Assumption, Interest Rate to Calculate Accretion on Intangible Asset Value of Business Acquired, Assumption, Interest Rate to Calculate Accretion on Intangible Asset Municipals Municipals [Member] Municipals. Increase in investments in unconsolidated affiliates Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Investment In Unconsolidated Entities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Investment In Unconsolidated Entities Foreign currency forward Foreign Exchange Forward [Member] Investment owned, (in shares) Investment Owned, Balance, Shares Risk Free Rate Measurement Input, Risk Free Interest Rate [Member] Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments, Excluding Discontinued Operations Income (Loss) from Equity Method Investments, Excluding Discontinued Operations FHLB collateral pledged Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Litigation Status [Axis] Litigation Status [Axis] Net increase in trade receivables Increase (Decrease) in Accounts Receivable Less than 50% LTV Less Than 50 Percent [Member] Loan-to-value (LTV) ratio less than 50%. CalPrivate Bank v. Chicago Title Co. and Chicago Title Ins. Co. CalPrivate Bank v. Chicago Title Co. and Chicago Title Ins. Co. [Member] CalPrivate Bank v. Chicago Title Co. and Chicago Title Ins. Co. Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Total liabilities, redeemable non-controlling interest and equity Liabilities and Equity For credit losses on securities for which losses were not previously recorded Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded Loss Contingencies [Line Items] Loss Contingencies [Line Items] Accumulated other comprehensive earnings Accumulated Other Comprehensive Income (Loss), Net of Tax Banc of California, National Association v. Laurie Peterson Banc of California, National Association v. Laurie Peterson [Member] Banc of California, National Association v. Laurie Peterson Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Term of contract, term one Derivative, Term of Contract, Term One Derivative, Term of Contract, Term One Statutory Accounting Practices, Jurisdiction [Domain] Statutory Accounting Practices, Jurisdiction [Domain] Net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Laurie Peterson v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman Laurie Peterson v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman, [Member] Laurie Peterson v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman, Mortgage loans, net of allowance for credit losses of $35 at September 30, 2020 Loans, net Financing Receivable, after Allowance for Credit Loss Matter of FGL Holdings Matter of FGL Holdings [Member] Matter of FGL Holdings Proceeds Proceeds from Sale, Maturity and Collection of Investments Antidilutive securities excluded from computation of EPS, less than, amount (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Equity Component [Domain] Equity Component [Domain] Other comprehensive earnings/gain (loss) - unrealized gain on investments and other financial instruments OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Schedule of Net Asset Value Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] Property and equipment, net Property, Plant and Equipment, Net Floor interest rate Debt Instrument, Floor Interest Rate Debt Instrument, Floor Interest Rate Entity Tax Identification Number Entity Tax Identification Number Morgan Stanley Morgan Stanley [Member] Morgan Stanley. Net earnings attributable to Fidelity National Financial, Inc. common shareholders Net earnings attributable to FNF common shareholders Net Income (Loss) Attributable to Parent Changes in assets and liabilities, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Change in collateral returned (posted) Increase (Decrease) in Collateral Returned (posted) Increase (Decrease) in Collateral Returned (posted) Subsidiary equity repurchase Payments to Noncontrolling Interests LIBOR London Interbank Offered Rate (LIBOR) [Member] Provision for loan losses Financing Receivable, Credit Loss, Expense (Reversal) Contractholder Funds Liability for Future Policy Benefit [Policy Text Block] Change in future policy benefits Increase (Decrease) in Future Policy Benefit Reserves Tradename Trade Names [Member] Basis of Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Private Equity Funds Private Equity Funds [Member] Canadian Imperial Bank of Commerce Canadian Imperial Bank of Commerce [Member] Canadian Imperial Bank of Commerce [Member] Direct title insurance premiums Direct Premiums Written Discount (or premiums) attributable to other factors Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Discount (Premium) Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Loss on sale of investments Loss on Sale of Investments Realized losses on derivatives and embedded derivatives Change In Fair Value Derivatives, Including Other Derivatives Change In Fair Value Derivatives, Including Other Derivatives Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] 2020 Financing Receivable, Year One, Originated, Current Fiscal Year Cash paid for: Supplemental Cash Flow Information [Abstract] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Residential mortgage loans Investments, Residential Mortgage Loans, Fair Value Disclosure Fair value of the investment residential mortgage loan portfolio Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Liabilities, Total Gains (Losses) Included in AOCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Debt Securities, Available-for-sale, Allowance for Credit Loss [Table] Debt Securities, Available-for-sale, Allowance for Credit Loss [Table] Other Commitments [Domain] Other Commitments [Domain] Gross Carrying Value Loans and Leases Receivable, Gross Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Cost Finite-Lived Intangible Assets, Gross Gross Unrealized Losses Less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Unrealized gain (loss) foreign currency translation, tax expense (benefit) Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Surrender rates Fair Value Inputs Surrender Rates Fair Value Inputs Surrender Rates Assets, Total Gains (Losses) Included in AOCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Financing Receivable, Recorded Investment, Aging [Abstract] Financing Receivable, Recorded Investment, Aging [Abstract] Reinsurance recoverable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Reinsurance Recoverables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Reinsurance Recoverables Basis of Financial Statements Basis of Accounting, Policy [Policy Text Block] 2019 Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year Weighted average shares outstanding FNF common stock, basic basis (in shares) Weighted Average Number of Shares Outstanding, Basic Agency title insurance premiums Assumed Premiums Written Basis spread on variable rate (as percent) Debt Instrument, Basis Spread on Variable Rate Agent commissions Insurance Commissions Ownership [Axis] Ownership [Axis] Document Information [Line Items] Document Information [Line Items] Jurisdiction [Axis] Jurisdiction [Axis] Cash and Cash Equivalents Cash and Cash Equivalents [Member] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Principles of Consolidation - VIEs Consolidation, Variable Interest Entity, Policy [Policy Text Block] Direct Direct Premiums Earned Loss Contingencies [Table] Loss Contingencies [Table] Carrying Value Reported Value Measurement [Member] Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Four Long-term Debt, Maturities, Repayments of Principal after Year Four Cannae Holdings Inc. Cannae Holdings Inc. [Member] Cannae Holdings Inc. [Member] Fundings of Cannae Holdings Inc. note receivable Payments for Advance to Affiliate Revenue Recognition Revenue from Contract with Customer [Text Block] Lease liabilities recognized in exchange for lease right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Reinsurance risk charge fee Reinsurance Risk Charge Fee Reinsurance Risk Charge Fee 4.50% Notes, net of discount 4.50 % Notes due August 2028 Four Point Five Zero Percent Unsecured Notes Due August 2028 [Member] Four Point Five Zero Percent Unsecured Notes Due August 2028 [Member] Income tax expense Income tax expense (benefit) Income Tax Expense (Benefit) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Schedule of Principal Maturities of Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Local Phone Number Local Phone Number Cash paid for acquisition Payments to Acquire Businesses, Gross Unaudited Pro Forma Results Business Acquisition, Pro Forma Information [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] Pro forma revenues Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Merrill Lynch Merrill Lynch [Member] Merrill Lynch [Member] Derivative [Line Items] Derivative [Line Items] Changes in Fair Value of Financial Instruments - Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of Other Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Outstanding principal Total long term debt Long-term Debt, Gross Deferred revenue (contract liabilities) Contract with Customer, Liability Consideration, cash paid per acquiree share (in usd per share) Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Cash Paid Per Acquiree Share Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Cash Paid Per Acquiree Share Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Short-term investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Short-term Investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Short-term Investments Purchase of additional share in consolidated subsidiaries Adjustments To Additional Paid in Capital, Purchase Of Additional Share In Noncontrolling Interests Adjustments To Additional Paid in Capital, Purchase Of Additional Share In Noncontrolling Interests DAC Dac [Member] DAC. Line of credit facility Line of Credit Facility, Maximum Borrowing Capacity 2.45% Senior Notes Due March 2031 2.45% Senior Notes Due March 2031 [Member] 2.45% Senior Notes Due March 2031 Prepaid expenses and other assets Prepaid Expense and Other Assets Other long-term investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Corporate and Other Fidelity National Financial Core Corporate and Other Subsegment [Member] Fidelity National Financial Core Corporate and Other Subsegment [Member] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Retained Earnings Retained Earnings [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Measurement Basis [Axis] Measurement Basis [Axis] Payment of contingent consideration for prior period acquisitions Payment for Contingent Consideration Liability, Financing Activities Number of lawsuits filed Loss Contingency, New Claims Filed, Number Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Pending Litigation Pending Litigation [Member] Allowance for Expected Credit Losses on Loans Financing Receivable, Allowance for Credit Loss [Table Text Block] Corporates Corporate Debt Securities [Member] Discontinued Operations and Disposal Groups [Abstract] Unfunded investment commitment Other Commitment Litigation Status [Domain] Litigation Status [Domain] Less: Treasury stock, 27,109,582 shares and 16,673,040 shares as of September 30, 2020 and December 31, 2019, respectively, at cost Treasury Stock, Value Partial withdrawals Fair Value Inputs, Partial Withdrawals Fair Value Inputs, Partial Withdrawals Multifamily Multifamily [Member] F&G F&G [Member] F&G Net Premiums Earned, Net Short-term investments, pledged, secured trust deposits Other Short-term Investments, Pledged, Customer Advances and Deposits Other Short-term Investments, Pledged, Customer Advances and Deposits Contractholder funds Policyholder Account Balance Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Discount rate Measurement Input, Discount Rate [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Basic Earnings Per Share, Basic [Abstract] Subsegments [Axis] Subsegments [Axis]