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] Change In Fair Value Of Derivatives Change In Fair Value Of Derivatives Change in fair value of derivatives. 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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 Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Loss on sales of investments and other assets and asset impairments, net Gain (Loss) on Investments and Disposition of Other 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Multiplier applied to damages Loss Contingency, Multiplier Applied to Damages Loss Contingency, Multiplier Applied to Damages 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] Amortization Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Amortization Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Net proceeds from 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] 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] 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 Interest and investment income, including realized 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] 3.400% Senior Notes due June 2030 3.400% Senior Notes due June 2030 [Member] 3.400% Senior Notes due June 2030 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 Local Phone Number Local Phone Number 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 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 (decrease) 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 Concentration Risk [Table] Concentration Risk [Table] 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] 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 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 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 Entity Address, City or Town Entity Address, City or Town 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 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 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 Increase (Decrease) in Reinsurance Payables 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 Gain (Loss) on Sale of Equity Investments Common stock, shares, outstanding (in shares) Common Stock, Shares, Outstanding Investments in unconsolidated affiliates Equity Method Investments Derivative Instruments Derivative Instruments [Member] Derivative Instruments [Member] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Revolving Credit Facility Revolving Credit Facility [Member] Broker-quoted Valuation, Market Approach [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] Payments to Acquire Businesses, Net of Cash Acquired 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 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] AOCI Attributable to Parent AOCI Attributable to Parent [Member] Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Net (increase) in prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets 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 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] Document Information [Line Items] Document Information [Line Items] Entity Tax Identification Number Entity Tax Identification Number 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] Liability to former owners Business Combination, Contingent Consideration, Liability 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 Change in treasury stock purchases payable in period Noncash Investing and Financing Activities, Change in Treasury Stock Purchases Payable Noncash Investing and Financing Activities, Change in Treasury Stock Purchases Payable 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) before income taxes and equity in earnings (loss) of unconsolidated affiliates Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Trading Symbol Trading Symbol 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 Legal Entity [Axis] Legal Entity [Axis] 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 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] City Area Code City Area Code Fixed maturity securities, available for sale Fair value Debt Securities, Available-for-sale Title of 12(b) Security Title of 12(b) Security 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] 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 Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Increase (Decrease) in 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. 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] 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] Concentration Risk [Line Items] Concentration Risk [Line Items] 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 Banking Industry Banking Industry [Member] Banking Industry [Member] Dividends paid Payments of Ordinary Dividends, Common Stock Gross gains Gain on Sale of Investments Equity securities Equity securities Equity Securities [Member] 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] Investments by Secondary Categorization [Domain] Investments by Secondary Categorization [Domain] 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 Residential mortgage loans, location percentage Residential Mortgage Loans, Location Percentage Residential Mortgage Loans, Location Percentage Net amount recoverable Gain on Business Interruption Insurance Recovery Fair Value In Investments Fair Value In Investments Fair Value In Investments 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] Pavonia Life Insurance Company Pavonia Life Insurance Company [Member] Pavonia Life Insurance Company [Member] 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 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] Entity Central Index Key Entity Central Index Key Entity Emerging Growth Company Entity Emerging Growth Company 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, 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] Unsecured notes Unsecured Debt [Member] Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Repayment of principal borrowed 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 Investments by Consolidated and Nonconsolidated Entities [Domain] Investments by Consolidated and Nonconsolidated Entities [Domain] Counterparty Name [Axis] Counterparty Name [Axis] FNF common stock, $0.0001 par value; authorized 600,000,000 shares as of June 30, 2020 and December 31, 2019; outstanding of 291,733,083 and 275,563,436 as of June 30, 2020 and December 31, 2019, respectively, and issued of 318,842,665 and 292,236,476 as of June 30, 2020 and December 31, 2019, respectively Common Stock, Value, Issued Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Other long-term investments Other Long-term Investments Change in reinsurance recoverable Change in reinsurance recoverable Increase (Decrease) in Reinsurance Recoverable 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 Contract Holders For Mortality And Administration 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 June 30, 2020 and December 31, 2019 includes $327 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 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] 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] Entity Address, Address Line One Entity Address, Address Line One 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 Entity Address, State or Province Entity Address, State or Province 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 gain on investments in unconsolidated affiliates Other comprehensive earnings - unrealized gain 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 (benefit) 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 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] Entity Interactive Data Current Entity Interactive Data Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-performance spread Fair Value Inputs Non Performance Spread Fair Value Inputs Non Performance Spread Other long-term investments Other Long-term Investments [Member] 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] Concentration of Credit or Market Risk [Axis] Concentration of Credit or Market Risk [Axis] Financing Receivable, before Allowance for Credit Loss, 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 gain 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 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 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 shareholders (in usd per share) Earnings Per Share, Diluted Proceeds from sales of investment securities Proceeds from Sale of Debt Securities, Available-for-sale Value of FNF share consideration Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Fair Value, Concentration of Risk, Disclosure Items [Domain] Fair Value, Concentration of Risk, Disclosure Items [Domain] 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). Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] 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 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] Realized gains and losses, net Net investment gains (losses) 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 Document Information [Table] Document Information [Table] 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 Risks and Uncertainties Concentration Risk Disclosure [Text Block] 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 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] 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] 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] 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] Entity Address, Postal Zip Code Entity Address, Postal Zip Code 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 Shell Company Entity Shell Company 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) 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] Hedging Designation [Domain] Hedging Designation [Domain] Additional investments in unconsolidated affiliates Payments to Acquire Equity Method Investments Net earnings 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] Document Quarterly Report Document Quarterly Report 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 Entity File Number Entity File Number 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 Document Fiscal Period Focus Document Fiscal Period Focus 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] Payments to Acquire Notes Receivable Payments to Acquire Notes Receivable 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 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] Amendment Flag Amendment Flag 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 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] Pro forma net loss 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 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 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. Entity Current Reporting Status Entity Current Reporting Status Debt Service Coverage Ratio [Domain] Debt Service Coverage Ratio [Domain] Debt Service Coverage Ratio Cash, pledged, customer advances and deposits Cash, Pledged, Customer Advances And Deposits Cash, Pledged, Customer Advances And Deposits Segment Information Segment Reporting Disclosure [Text Block] 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 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 Entity Small Business Entity Small Business Unrealized (loss) 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 June 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 Entity Filer Category Entity Filer Category 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 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] 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] Document Fiscal Year Focus Document Fiscal Year Focus 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 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] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [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 Single Issuer Single Issuer [Member] Single Issuer Hybrids Hybrids [Member] Hybrids. 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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 $28 at June 30, 2020 Loans, net Financing Receivable, after Allowance for Credit Loss 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 Number of issuers in investment Number Of Issuers In Investment Number Of Issuers In Investment Equity Component [Domain] Equity Component [Domain] Other comprehensive 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 Morgan Stanley Morgan Stanley [Member] Morgan Stanley. Net earnings attributable to Fidelity National Financial, Inc. common shareholders Net Income (Loss) Attributable to Parent Changes in assets and liabilities, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Increase (Decrease) in Collateral Returned (posted) Increase (Decrease) in Collateral Returned (posted) Increase (Decrease) in Collateral Returned (posted) Payments to Noncontrolling Interests 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] Future policy benefits reflected in net income (loss) 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] Private Equity 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