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 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 Cash paid for: Supplemental Cash Flow Information [Abstract] LTV 60% to 75% LTV 60 to 75 Percent [Member] Loan-to-value (LTV) ratio from 60 to 75%. Schedule of Initial Purchase Price Schedule of Business Acquisitions, by Acquisition [Table Text Block] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding 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 Greater than 1.25 Greater than 1.25x Greater Than One Point Two Five [Member] Greater Than One Point Two Five [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Derivative liability Derivative Liability Dividends declared, per common share Dividends, Common Stock, Cash Direct Direct Premiums Earned 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 Securities, at fair value Equity securities Equity Securities, FV-NI, Current Unrealized loss foreign currency translation, tax benefit Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Information about Trade Receivables and Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Payment of contingent consideration for prior period acquisitions Payment for Contingent Consideration Liability, Financing Activities 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 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] (Gain) loss 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 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 Black Scholes model Black Scholes Model [Member] Black Scholes Model [Member] Investment, Name [Axis] Investment, Name [Axis] Income-Approach Valuation, Income Approach [Member] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 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 Net change in income taxes Increase (Decrease) in Income Taxes Payable Liabilities, Total Gains (Losses) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Increase in goodwill Goodwill, Purchase Accounting Adjustments Scottish Re Scottish Re [Member] Scottish Re [Member] Commercial mortgage loans Commercial Mortgage Loans [Member] Commercial Mortgage Loans Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract] Financing Receivable Credit Quality Indicator Current Year Abstract [Abstract] Financing Receivable Credit Quality Indicator Current Year Abstract Balance at beginning of period Balance at end of period Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net Document Fiscal Year Focus Document Fiscal Year Focus Kubera Reassurance Company Kubera Reassurance Company [Member] Kubera Reassurance Company [Member] [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Weighted Average Estimated Useful Life (in years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Antidilutive securities excluded from computation of EPS, less than, amount (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Revenue recognized Contract with Customer, Liability, Revenue Recognized Commercial mortgage loans, percentage of investments Commercial Mortgage Loans, Percentage of Investments Commercial Mortgage Loans, Percentage of Investments East South Central East South Central [Member] East South Central [Member] Business Combination and Asset Acquisition [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Secured trust deposits Contract With Customer, Liability, Customer Deposits Contract With Customer, Liability, Customer Deposits Reinsurance recoverable, net of allowance for credit losses of $20 and $21 at June 30, 2021 and December 31, 2020, respectively Reinsurance Recoverables, Including Reinsurance Premium Paid Assets, Total Gains (Losses) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Market value of option Fair Value Inputs Market Value Of Option Fair value inputs market value of option. Over 90 days past due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] FHLB collateral pledged Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 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 Subtotal, Fair Value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Other intangible assets, net Intangible Assets, Net (Excluding Goodwill and Title Plants) Intangible Assets, Net (Excluding Goodwill and Title Plants) Schedule of Investments [Line Items] Schedule of Investments [Line Items] Contractholder account deposits Proceeds from Annuities and Investment Certificates Agency title insurance premiums Insurance Contracts, Agency Title Insurance Premiums [Member] Insurance Contracts, Agency Title Insurance Premiums [Member] Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] 2017 2016 Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Preferred stock, $0.0001 par value; authorized 50,000,000 shares; issued and outstanding, none Preferred Stock, Value, Issued Subsidiary dividends declared to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Retained Earnings Retained Earnings [Member] Other Other Products And Services [Member] Other Products And Services [Member] Debt instrument Debt Instrument, Fair Value Disclosure Fixed maturity securities, available-for-sale Fixed maturity securities Debt Securities [Member] West South Central West South Central US [Member] West South Central US [Member] Fair Value and Gross Unrealized Losses of Available-for-sale Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Title plants Intangible Assets, Title Plants Intangible Assets, Title Plants Distributions from unconsolidated affiliates, return on investment Proceeds from Equity Method Investment, Distribution Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Net decrease in trade receivables Increase (Decrease) in Accounts Receivable Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Comprehensive earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Other long-term investments Other Long-term Investments [Member] Prior years Prior Year Claims and Claims Adjustment Expense Net earnings (loss) per share attributable to common shareholders, basic (in usd per share) Earnings Per Share, Basic Net realized/unrealized gains (losses) on securities Equity Securities, FV-NI, Realized Gain (Loss) Non-cash lease costs Operating Lease, Expense Revenue Recognition Revenue from Contract with Customer [Text Block] Less: Cash Acquired Cash Acquired from Acquisition Yield Fair Value Input, Yield Fair Value Input, Yield Balance at Beginning of Period Balance at End of Period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Document Type Document Type 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 Industrial - General Industrial, General [Member] Industrial, General [Member] DSC ratio, amortization period Debt Service Coverage Ratio, Amortization Period Debt Service Coverage Ratio, Amortization Period Fair Value Measurement [Domain] Fair Value Measurement [Domain] Diluted Earnings Per Share, Diluted [Abstract] Entity Current Reporting Status Entity Current Reporting Status Amortized cost of loans on non-accrual Amortized Cost of Non-Accrual Loans [Abstract] Amortized Cost of Non-Accrual Loans Schedule of Investments [Table] Schedule of Investments [Table] Total asset derivatives Fair Value Derivative Asset, Fair Value, Gross Asset Futures contracts Future [Member] Adjustment for net unrealized investment (gains) losses Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Unrealized Gain (Loss) on Investment Assets Assets, Fair Value Disclosure [Abstract] Industrial - Warehouse Warehouse [Member] Notes payable Long-term Debt Distributions from unconsolidated affiliates, return of investment Proceeds from Equity Method Investment, Distribution, Return of Capital Ceded Credit Risk [Line Items] Ceded Credit Risk [Line Items] Deferred sales inducements Deferred Sales Inducements, Paid Deferred Sales Inducements, Paid Level 1 Fair Value, Inputs, Level 1 [Member] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Change in future policy benefits Increase (Decrease) in Future Policy Benefit Reserves Interest and investment income, including recognized gains and losses, net Net Investment Income, And Gain (Loss) On Investments Net Investment Income, And Gain (Loss) On Investments Direct title insurance premiums Direct Premiums Written Cash and Cash Equivalents Cash and Cash Equivalents [Member] Value of distribution network acquired Value of Distribution Asset [Member] Value of Distribution Asset Allowance for Expected Credit Losses on Loans Financing Receivable, Allowance for Credit Loss [Table Text Block] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Trade receivables Accounts Receivable, after Allowance for Credit Loss Pending Litigation Pending Litigation [Member] 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 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 Hotel Hotel [Member] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Pacific Pacific US [Member] Pacific US [Member] Liabilities, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Available-for-sale securities Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Gross gains Debt Securities, Available-for-sale, Realized Gain Insurance Subsidiary Affiliated Entity [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Foreign currency forward Foreign Currrency Forward [Member] Foreign Currrency Forward 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 Trading Symbol Trading Symbol Plaintiffs claim losses amount Loss Contingency, Damages Sought, Value F&G acquisition Stock Issued During Period, Value, Acquisitions 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 FIA embedded derivative FIA Embedded Derivatives [Member] FIA embedded derivatives Statutory Accounting Practices, Jurisdiction [Domain] Statutory Accounting Practices, Jurisdiction [Domain] Non-performing Nonperforming Financial Instruments [Member] Whole loans Equity securities Equity Securities [Member] Foreign Governments Debt Security, Government, Non-US [Member] Escrow fees Escrow Fees [Member] Escrow Fees [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Other long-term investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Lease liabilities Operating Lease, Liability Call options Call Option [Member] FNF common stock, $0.0001 par value; authorized 600,000,000 shares as of June 30, 2021 and December 31, 2020; outstanding of 285,689,238 and 291,448,627 as of June 30, 2021 and December 31, 2020, respectively, and issued of 323,664,713 and 322,622,948 as of June 30, 2021 and December 31, 2020, respectively Common Stock, Value, Issued Liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities Debt-to-Value [Axis] Debt-to-Value [Axis] Commercial mortgage-backed securities Commercial Mortgage Backed Securities [Member] DSI DSI [Member] DSI Other securities which provide for periodic payments, Fair Value Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Acquisitions Business Combination Disclosure [Text Block] Other Commitments [Table] Other Commitments [Table] 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 Traditional Life Insurance Premiums Life Insurance Product Line [Member] Total fixed maturities Fixed Maturities [Member] Class of Stock [Axis] Class of Stock [Axis] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Derivative investments Derivative Instruments [Member] Derivative Instruments [Member] Liabilities, Net transfer In (Out) of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net Real estate technology Real Estate Technology [Member] Real Estate Technology [Member] Reserve for title claim losses Liability for Unpaid Claims and Claims Adjustment Expense, Net Changes in Fair Value of Financial Instruments - Assets Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Cash dividend per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Revenue from contract with customer Revenue from Contract with Customer, Excluding Assessed Tax Other assets Other Asset Commitments [Member] Other Asset Commitments Credit Suisse Credit Suisse [Member] Credit Suisse Funds withheld for reinsurance liabilities Funds Held under Reinsurance Agreements, Liability Consolidation Items [Domain] Consolidation Items [Domain] Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Barclay's Bank Barclays Bank [Member] Barclay's Bank. Measurement Input Type [Domain] Measurement Input Type [Domain] Fair Values, Less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Realized gains on certain derivative instruments Gain (Loss) on Sale of Derivatives Segment Information Segment Reporting Disclosure [Text Block] Purchase of incremental share in consolidated subsidiaries Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] 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 Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Tax deferred property exchange income Tax Deferred Property Exchange [Member] Tax Deferred Property Exchange Additional Paid-in Capital Additional Paid-in Capital [Member] 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 Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Net increase in reserve for title claim losses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve 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 Other assets Other Assets [Member] Mortgage loans, net of allowance for credit losses of $34 and $39 at June 30, 2021 and December 31, 2020, respectively Total mortgage loans Financing Receivable, after Allowance for Credit Loss Greater than 1.00 Greater Than One Point Zero Zero [Member] Greater Than One Point Zero Zero 1.00 - 1.25 1.00x - 1.25x Greater Than One But Less Than One Point Two Five [Member] Greater Than One But Less Than One Point Two Five [Member] 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 Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Total Fidelity National Financial, Inc. shareholders’ equity Stockholders' Equity Attributable to Parent Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Thereafter Present Value Of Future Insurance Profits Amortization Expense After Four Years Present Value Of Future Insurance Profits Amortization Expense After Four Years Ceded Ceded Premiums Earned Option cost Fair Value Input Option Cost Fair Value Input Option Cost Prepaid expenses and other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Schedule of Supplemental Cash Flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Earnings 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 and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Purchases of treasury stock Payments for Repurchase of Common Stock 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. Equity: Stockholders' Equity Attributable to Parent [Abstract] Trade and notes receivables, net of allowance of $28 and $28 at June 30, 2021 and December 31, 2020, respectively Trade and notes receivables, net of allowance Accounts and Financing Receivable, after Allowance for Credit Loss Derivatives: Derivative Asset [Abstract] 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] Operating Segments Operating Segments [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Schedule of Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Business Acquisition [Line Items] Business Acquisition [Line Items] Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Income Statement [Abstract] Income Statement [Abstract] Investments in unconsolidated affiliates Equity Method Investments Asset Class [Domain] Asset Class [Domain] Prepaid expenses and other assets Prepaid Expense and Other Assets Trade and notes receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Cash paid for outstanding F&G shares Payments To Acquire Businesses , Including Contingent Consideration Shares Payments to Acquire Businesses , Including Contingent Consideration Shares 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 Earnings per share Net Income Loss Per Common Share Attributable To Controlling Interest [Abstract] Net income (loss) per common share attributable to controlling interest. Income tax expense Income tax expense (benefit) Income Tax Expense (Benefit) Other Commitments [Domain] Other Commitments [Domain] Insurance [Abstract] Insurance [Abstract] Investment Type [Axis] Investment Type [Axis] Offered quotes Fair Value Inputs Quoted Prices Fair Value Inputs Quoted Prices Other long-term investments Other Assets, Fair Value Disclosure Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Small Business Entity Small Business Other invested assets Other Invested Assets [Member] Other Invested Assets [Member] Broker-quoted Valuation, Market Approach [Member] Equity Component [Domain] Equity Component [Domain] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Truist Truist [Member] Truist Value of FNF share consideration Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Residential mortgage loans, location percentage Residential Mortgage Loans, Location Percentage Residential Mortgage Loans, Location Percentage Litigation Case [Axis] Litigation Case [Axis] F&G acquisition (in shares) Stock Issued During Period, Shares, Acquisitions Pavonia Life Insurance Company Pavonia Life Insurance Company [Member] Pavonia Life Insurance Company [Member] Unfunded investment commitment Other Commitment Liabilities: Liabilities [Abstract] Short-Term Short-term Investments [Member] Counterparty Name [Domain] Counterparty Name [Domain] Weighted Average Weighted Average [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Total expenses Benefits, Losses and Expenses Dividend Yield Measurement Input, Expected Dividend Rate [Member] 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 Change in fair value of reinsurance related embedded derivatives Change in fair value of derivatives Derivative, Gain (Loss) on Derivative, Net Total Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position Segment Reporting [Abstract] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Other Other Property [Member] Total fixed maturity available-for-sale securities, Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Change in funds withheld from reinsurers Increase (Decrease) in Reinsurance Payables Funding agreement backed note, authorized amount Funding Agreement Backed Note, Program, Authorized Amount Funding Agreement Backed Note, Program, Authorized Amount 2021 Present Value of Future Insurance Profits, Expected Amortization, Remainder of Fiscal Year Contractholder funds Contract Holder Funds [Member] FIA embedded derivatives, included in contractholder funds Fixed indexed annuities Fixed Index Annuity [Member] Fixed index annuity. Subscription agreements, stock purchase, share price (in usd per share) Subscription Agreement, Commitment to Purchase, Shares, Share Price Subscription Agreement, Commitment to Purchase, Shares, Share Price Maximum amount of loss due to credit risk Net Credit Risk Derivative Asset, Fair Value, Amount Offset Against Collateral Premiums and other considerations: Premiums Earned, Net [Abstract] Investment, Name [Domain] Investment, Name [Domain] Other securities which provide for periodic payments, Amortized Cost Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Common stock, shares authorized (in shares) Common Stock, Shares Authorized Limited partnerships Limited Partnership [Member] Limited Partnership [Member] Corporates, Non-structured Hybrids, Municipal and Government securities: Corporates, Non-structured Hybrids, Municipal and Government securities: [Member] Corporates, Non-structured Hybrids, Municipal and Government Securities Other long-term investments Other Long-term Investments Subtotal, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Credit linked note Credit Linked Note [Member] Credit Linked Note [Member] Product and Service [Domain] Product and Service [Domain] Summary of the Reserve for Claim Losses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Gross investment income Gross Investment Income, Operating Less: Net earnings attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Change in reinsurance liabilities held at fair value resulting from a change in the instrument-specific credit risk, tax benefit Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, Tax Equity Method Investment, Nonconsolidated Investee or Group of Investees Equity Method Investment, Nonconsolidated Investee or Group of Investees [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 Real Estate [Domain] Real Estate [Domain] Total net consideration paid Business Combination, Consideration Transferred, Net Business Combination, Consideration Transferred, Net Mountain Mountain [Member] Mountain [Member] Geographical [Axis] Geographical [Axis] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Term of contract, term two Derivative, Term of Contract, Term Two Derivative, Term of Contract, Term Two Other investments Other Investments [Member] Charges assessed to contractholders for mortality and admin Charges Assessed To Contract Holders For Mortality And Administration Mortality and expense charges and administrative fees. Funds withheld co-insurance basis, percentage Funds Withheld Co-Insurance Basis, Percentage Funds Withheld Co-Insurance Basis, Percentage Total financial liabilities at fair value Financial Liabilities Fair Value Disclosure Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Limited Partnerships Limited Partnerships [Member] Limited Partnerships Goodwill expected to be tax deductible Business Acquisition, Goodwill, Expected Tax Deductible Amount Change in valuation of derivatives, equity and preferred securities, net Unrealized Gain (Loss) on Investments 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 Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Less: Treasury stock, 37,975,475 shares and 31,174,321 shares as of June 30, 2021 and December 31, 2020, respectively, at cost Treasury Stock, Value Equity in earnings of unconsolidated affiliates Equity in earnings (loss) of unconsolidated affiliates Income (Loss) from Equity Method Investments Other operating expenses Other Cost and Expense, Operating Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Structured hybrids Structured Hybrids [Member] Structured hybrids. 2023 Present Value of Future Insurance Profits, Expected Amortization, Year Two Commercial mortgage loans Investments, Commercial Mortgage Loans, Fair Value Disclosure Fair value of the investment commercial mortgage loan portfolio Interest Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Amortization Expense, Accrued Interest Draw on revolving credit facility Proceeds from Long-term Lines of Credit Available-for-sale Securities Available-for-sale Securities [Member] Funding agreement backed note, amount outstanding Funding Agreement Backed Note, Program, Amount Outstanding Funding Agreement Backed Note, Program, Amount Outstanding Other embedded derivatives Embedded derivatives Embedded Derivative Financial Instruments [Member] Accounts payable and accrued liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Derivative [Table] Derivative [Table] Revenues: Revenues [Abstract] Software Computer Software, Intangible Asset [Member] 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 Stock repurchase program, number of shares authorized to be repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Other comprehensive earnings — unrealized gain on investments and other financial instruments OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax 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 Direct Policyholder Benefits and Claims Incurred, Direct Change in allowance for expected credit losses Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) FIA embedded derivatives, included in contractholder funds Embedded Derivatives Included In Contractholder Funds [Member] Embedded derivatives, included in contractholder funds. Investments Investment [Text Block] Equity financing associated with the acquisition of F&G Noncash or Part Noncash Acquisition, Equity Financing Noncash or Part Noncash Acquisition, Equity Financing Income Statement Location [Domain] Income Statement Location [Domain] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Interest and investment income Interest and investment income Net Investment Income 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 Accrued interest receivable Interest Receivable Property and equipment, net Property, Plant and Equipment, Net Estimated Amortization Expense for VOBA in Future Fiscal Periods Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] 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) Debt service payments Repayments of Long-term Debt Current (less than 30 days past due) Financial Asset, 1 to 29 Days Past Due [Member] Realized gains (losses) on other invested assets Gain (Loss) on Sale of Other Investments Notes payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt Total revenues Revenues Non-performance spread Fair Value Inputs Non Performance Spread Fair Value Inputs Non Performance Spread Net earnings per share from discontinued operations attributable to common shareholders (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Other Commitments [Line Items] Other Commitments [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Wilton Reassurance Company Wilton Reassurance Company [Member] Wilton reassurance company. Expenses: Costs and Expenses [Abstract] Total number of available-for-sale securities in an unrealized loss position Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Title premiums Premiums Written, Net Document Fiscal Period Focus Document Fiscal Period Focus 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 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 Commitment to Invest Commitment to Invest [Member] Commitment to Invest [Member] Counterparty Name [Axis] Counterparty Name [Axis] Beginning balance (in shares) Ending balance (in shares) Shares, Issued Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] 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 United States UNITED STATES Discount rate Measurement Input, Discount Rate [Member] Investment owned, (in shares) Investment Owned, Balance, Shares Third-Party Valuation Third Party Valuation Technique [Member] Third Party Valuation Technique [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] Beginning balance Ending balance of claim loss reserve for title insurance Liability for Claims and Claims Adjustment Expense Revenues from external customers Insurance Services Revenue Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Weighted average common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Collections of notes receivable Proceeds from Collection of Notes Receivable FTAC Subscription Agreements FTAC Subscription Agreements [Member] FTAC Subscription Agreements Related Party [Domain] Related Party [Domain] Direct title insurance premiums Insurance Contracts, Direct Title Insurance Premiums [Member] Insurance Contracts, Direct Title Insurance Premiums [Member] Financing Receivable, Nonaccrual Financing Receivable, Nonaccrual [Table Text Block] Write-offs charged against the allowance Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff Total title claim loss provision Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Ceded Credit Risk [Table] Ceded Credit Risk [Table] Investment expense Investment Income, Investment Expense Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Loan subservicing revenue Fees and Commissions, Mortgage Banking and Servicing Maximum loss exposure, amount Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Short-term investments, at June 30, 2021 and December 31, 2020 includes pledged short-term investments of $3 and $1, respectively, related to secured trust deposits Other Short-term Investments Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Total Mortgage Loans Total Mortgage Loans [Member] Total Mortgage Loans [Member] Benefits and Other Changes in Insurance Policy Reserves: Policyholder Benefits and Claims Incurred [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Subscription agreements, stock purchase, par value (in usd per share) Subscription Agreement, Commitment to Purchase, Common Stock, Par Value Subscription Agreement, Commitment to Purchase, Common Stock, Par Value 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 Agency title insurance premiums Assumed Premiums Written Litigation Status [Domain] Litigation Status [Domain] Ceded Policyholder Benefits and Claims Incurred, Ceded 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). 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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 Other Commitments [Axis] Other Commitments [Axis] Number of lawsuits filed Loss Contingency, New Claims Filed, Number Statistical Measurement [Axis] Statistical Measurement [Axis] 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 Subsequent Event Subsequent Event [Member] Cover [Abstract] Cover [Abstract] Total non-accrual loans Loans at Amortized Cost, Nonaccrual Loans at Amortized Cost, Nonaccrual Goodwill Goodwill Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest 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] Volatility Measurement Input, Price Volatility [Member] Gross Unrealized Losses Less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Fair Value Measured at Net Asset Value Fair Value Measured at Net Asset Value Per Share [Member] Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 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] 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. 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2022 Present Value of Future Insurance Profits, Expected Amortization, Year One Recognized gains and losses, net Recognized gains and (losses), net Gain (Loss) on Investments Change in Fair Value of Derivative Instruments Derivative Instruments, Gain (Loss) [Table Text Block] West North Central West North Central US [Member] West North Central US [Member] Amendment Flag Amendment Flag Fair Value Estimate of Fair Value Measurement [Member] Number of instruments held Derivative, Number of Instruments Held Assets, Net transfer In (Out) of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Statutory capital and surplus Statutory Accounting Practices, Statutory Capital and Surplus, Balance Effects of Reinsurance [Line Items] Effects of Reinsurance [Line Items] Changes in Fair Value of Financial Instruments - Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] 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Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Total equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Commercial mortgage loans Commercial mortgages Commercial Mortgage Commercial Portfolio Segment [Member] Equity Components [Axis] Equity Components [Axis] Agent commissions Insurance Commissions F&G F&G Segment [Member] F&G Segment Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Paysafe Limited Paysafe Limited [Member] Paysafe Limited For securities sold during the period Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Collateral posted Collateral Derivative Asset, Collateral, Obligation to Return Cash, Offset Assets, Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Change in insurance recoverable Change in insurance recoverable Increase (Decrease) in Reinsurance Recoverable Claim loss provision related to: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Schedule of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Entity File Number Entity File Number Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] 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] Fixed Maturity securities, ABS Fixed Maturities Available For Sale [Member] Fixed Maturities Available For Sale [Member] Assets, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Product and Service [Axis] Product and Service [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] Title Title Segment [Member] Title Segment Equity securities (NAV) Equity Securities without Readily Determinable Fair Value, Amount Preferred stock, par or stated value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Other invested assets Investments, Affiliated Bank Loan, Fair Value Disclosure Investments, Affiliated Bank Loan, Fair Value Disclosure Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Unrealized gain (loss) on foreign currency translation Other comprehensive loss - unrealized loss on foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Change in fair value of other derivatives and embedded derivatives Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Investments: Investments [Abstract] Statement [Line Items] Statement [Line Items] Aspida Re Aspida Re [Member] Aspida Re Loans Segregated by Risk Rating Exposure Financing Receivable Credit Quality Indicators [Table Text Block] Total investments Investments Fixed maturity securities, available for sale Fair Value/ Carrying Value Total fixed maturity available-for-sale securities, Fair Value Debt Securities, Available-for-sale Subscription agreements, ownership interest after purchase, percent Subscription Agreement, Ownership Interest After Purchase, Percent Subscription Agreement, Ownership Interest After Purchase, Percent Policy loans Policy Loans, Fair Value Policy Loans, Fair Value Debt Covenant Terms [Axis] Debt Covenant Terms [Axis] Debt Covenant Terms [Axis] Net proceeds from (purchases of) sales and maturities of short-term investment securities Payments for (Proceeds from) Short-term Investments Entity Address, State or Province Entity Address, State or Province Entity [Domain] Entity [Domain] Entity Shell Company Entity Shell Company Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Escrow, title-related and other fees Other revenues Insurance Commissions and Fees Asset Class [Axis] Asset Class [Axis] Local Phone Number Local Phone Number Loan to value, threshold (less than) Loan to Value, Maximum Threshold Highest loan to value ratio present in the loan portfolio. Debt offering Proceeds from Issuance of Common Stock Total assets Assets Assets Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] VOBA Voba [Member] VOBA. Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Geographical [Domain] Geographical [Domain] Strike Price Measurement Input, Share Price [Member] Available-for-sale embedded derivative Available For Sale Embedded Derivatives [Member] Available-for-sale embedded derivatives. Non-controlling Interest Noncontrolling Interest [Member] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Schedule of Distribution of CMLs, Gross Valuation by Property Type and Geographic Region Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Deferred sales inducement, unrealized investment gains Deferred Sales Inducement Cost, Unrealized Gain (Loss) on Investment Derivative Contract [Domain] Derivative Contract [Domain] Net Premiums Earned, Net Term of contract, term four Derivative, Term of Contract, Term Four Derivative, Term of Contract, Term Four Residential mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Accounts payable and accrued liabilities: Accounts Payable and Accrued Liabilities [Member] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Litigation Status [Axis] Litigation Status [Axis] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Entity Tax Identification Number Entity Tax Identification Number Percentage of total investments % of Total Residential Mortgage Receivable, Percentage of Total Percentage of the total residential loan portfolio Subsequent Event [Line Items] Subsequent Event [Line Items] Basic Earnings Per Share, Basic [Abstract] Net Policyholder Benefits and Claims Incurred, Net Corporate and Other Corporate and Other [Member] Residential mortgage loans Residential mortgages Residential Mortgage Residential Portfolio Segment [Member] Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Net earnings per share attributable to common shareholders, diluted (in usd per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] % of Total Financing Receivable, before Allowance for Credit Loss, to Total, Percent Income taxes Income Taxes Paid, Net 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 Whole loans Whole Loans [Member] Whole Loans Municipals Municipals [Member] Municipals. Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments, Excluding Discontinued Operations Income (Loss) from Equity Method Investments, Excluding Discontinued Operations 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] Equity securities Equity Securities, FV-NI, Measurement Input Texas NEW JERSEY Subsidiary dividends paid to non-controlling interest shareholders Payments of Ordinary Dividends, Noncontrolling Interest Comprehensive earnings attributable to Fidelity National Financial, Inc. common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Allowance % of Total Financing Receivable, Allowance for Credit Loss to Outstanding, Percent Deferred revenue (contract liabilities) Contract with Customer, Liability LTV Less Than 50 % LTV Less Than 50 Percent [Member] Loan-to-value (LTV) ratio less than 50%. Other comprehensive earnings (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] 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. Deferred tax liability Deferred Income Tax Liabilities, Net Additional investment in consolidated subsidiaries Payments for Proceeds From Investment in Consolidated Subsidiaries Payments for Proceeds From Investment in Consolidated Subsidiaries Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Collateral held Collateral Already Posted, Aggregate Fair Value 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 Net earnings per share from continuing operations attributable to common shareholders (in usd per share) Income (Loss) from Continuing Operations, Per Basic Share Net earnings from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Corporates Corporate Debt Securities [Member] Term of contract, term one Derivative, Term of Contract, Term One Derivative, Term of Contract, Term One 2021 2020 Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 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, Matter of FGL Holdings Matter of FGL Holdings [Member] Matter of FGL Holdings Depreciation and amortization Depreciation, Depletion and Amortization Increase in intangibles Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Assets and Liabilities Carrying at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Accumulated Other Comprehensive Earnings (Loss) AOCI Attributable to Parent [Member] Company-owned life insurance Bank Owned Life Insurance Financing Receivable Credit Quality Indicator Prior Year [Abstract] Financing Receivable Credit Quality Indicator Prior Year [Abstract] Financing Receivable Credit Quality Indicator Prior Year Common stock, shares, outstanding (in shares) Common Stock, Shares, Outstanding Financial Instruments [Domain] Financial Instruments [Domain] Jurisdiction [Axis] Jurisdiction [Axis] 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 Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Morgan Stanley Morgan Stanley [Member] Morgan Stanley. 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 For credit losses on securities for which losses were not previously recorded Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded Change in collateral returned (posted) Increase (Decrease) in Collateral Returned (posted) Increase (Decrease) in Collateral Returned (posted) Loans in process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Due in one year or less, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Number of investments Number of investments Number of investments Loss Contingencies [Line Items] Loss Contingencies [Line Items] Canadian Imperial Bank of Commerce Canadian Imperial Bank of Commerce [Member] Canadian Imperial Bank of Commerce [Member] Residential mortgage-backed securities Residential Mortgage Backed Securities [Member] Treasury stock repurchased (in shares) Treasury Stock, Shares, Acquired Allowance for doubtful accounts, premiums and other receivables Allowance for Doubtful Accounts, Premiums and Other Receivables Derivative investments Derivative Asset Realized gains (losses) on derivatives and embedded derivatives Change In Fair Value Derivatives, Including Other Derivatives Change In Fair Value Derivatives, Including Other Derivatives Document Quarterly Report Document Quarterly Report Total Gross Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Par Value Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Par Value Residential mortgage loans Investments, Residential Mortgage Loans, Fair Value Disclosure Fair value of the investment residential mortgage loan portfolio Liabilities Related to Investment Contracts, Fair Value Disclosure Liabilities Related to Investment Contracts, Fair Value Disclosure Liabilities Liabilities, Fair Value Disclosure [Abstract] Risk Free Rate Measurement Input, Risk Free Interest Rate [Member] Personnel costs Labor and Related Expense Net earnings Net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Investments [Domain] Investments [Domain] Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Prior Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 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 Common stock, par or stated value per share (in dollars per share) Common Stock, Par or Stated Value Per Share 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 Net realized gains on fixed maturity available-for-sale securities Debt Securities, Realized Gain (Loss) Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Surrender rates Fair Value Inputs Surrender Rates Fair Value Inputs Surrender Rates 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 Entity Central Index Key Entity Central Index Key Summary of Changes Intangible Assets, VOBA and DAC DSI Schedule of Finite-Lived Intangible Assets [Table Text Block] Security Exchange Name Security Exchange Name Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Balance at Beginning of Period Balance at End of Period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Other comprehensive earnings (loss) Other Comprehensive Income (Loss), Net of Tax Estimated litigation liability Estimated Litigation Liability Cannae Holdings Inc. Cannae Holdings Inc. [Member] Cannae Holdings Inc. [Member] Current Fiscal Year End Date Current Fiscal Year End Date Dividends Stockholders' Equity Note Disclosure [Text Block] Measurement Basis [Axis] Measurement Basis [Axis] Additional investments in unconsolidated affiliates Payments to Acquire Equity Method Investments Student Housing Student Housing [Member] Student Housing Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Changes in assets and liabilities, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Class of Stock [Domain] Class of Stock [Domain] Summary of Unfunded Commitments Other Commitments [Table Text Block] Merrill Lynch Merrill Lynch [Member] Merrill Lynch [Member] Stock-based compensation APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition Debt costs/equity issuance additions Payment of Financing and Stock Issuance Costs 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] 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 Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] 2018 2017 Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year DAC Dac [Member] DAC. Contractholder account withdrawals Repayments of Annuities and Investment Certificates Securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Change in Unrealized Gains (Losses) Incl in OCI Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Asset-backed securities Asset-backed Securities [Member] Number of agreements Number of Agreements Number of Agreements Total liability derivatives Derivative Liability, Fair Value, Gross Liability Debt-to-Value [Domain] Debt-to-Value [Domain] Subscriptions funded, shares received (in shares) Subscription Agreements, Subscriptions Funded, Shares Received Subscription Agreements, Subscriptions Funded, Shares Received Allowance for credit loss Allowance for expected credit loss Beginning Balance Ending Balance Financing Receivable, Allowance for Credit Loss Preferred securities Preferred Stock [Member] Due after ten years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 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 earnings from continuing operations Net earnings (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Due in one year or less, Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Partial withdrawals Fair Value Inputs, Partial Withdrawals Fair Value Inputs, Partial Withdrawals Derivative, strike price Derivative, Price Risk Option Strike Price Assets, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases F&G F&G [Member] F&G Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Benefits and other changes in policy reserves Policyholder Benefits and Claims Incurred, Net, Life and Annuity 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 Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year