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 Total equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Level 3 Fair Value, Inputs, Level 3 [Member] Gross Proceeds from Sale/Maturity Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2023 Long-term Debt, Maturities, Repayments of Principal in Year Four Revenue recognized Contract with Customer, Liability, Revenue Recognized Maturities of Long-term Debt [Abstract] Maturities of Long-term Debt [Abstract] Revenue Recognition, Other Revenue Recognition, Other, Policy [Policy Text Block] Revenue Recognition, Other, Policy [Policy Text Block] Summary of the Reserve for Claim Losses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Change in reinsurance recoverable Increase (Decrease) in Reinsurance Recoverable Total investments Investments 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 Treasury stock, at cost (in shares) Treasury Stock, Shares Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Reclassification adjustments for change in unrealized gains and losses included in net earnings, tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Current Fiscal Year End Date Current Fiscal Year End Date Total revenues Revenues Claim loss provision related to: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Weighted average shares outstanding, diluted basis (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Address, Postal Zip Code Entity Address, Postal Zip Code Line of credit facility Line of Credit Facility, Maximum Borrowing Capacity Income taxes payable Taxes Payable Included in equity securities shares of related party (in shares) Investment Owned, Balance, Shares Property and equipment, net Property, Plant and Equipment, Net Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] LIBOR London Interbank Offered Rate (LIBOR) [Member] Accumulated Other Comprehensive Earnings (Loss) AOCI Attributable to Parent [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Basis spread on variable rate (as percent) Debt Instrument, Basis Spread on Variable Rate Total assets Assets Assets Total expenses Benefits, Losses and Expenses Entity Shell Company Entity Shell Company Lease liabilities Operating Lease, Liability Cover page. Cover [Abstract] Document Type Document Type Annual interest rate Debt Instrument, Interest Rate, Effective Percentage No Allowance For Credit Losses No Allowance For Credit Losses [Member] No Allowance For Credit Losses Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Pending Litigation Pending Litigation [Member] Investments Investments in Debt and Equity Instruments, Cash and Cash Equivalents, Unrealized and Realized Gains (Losses) [Text Block] Subsequent Event Subsequent Event [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Impairment of lease assets Proceeds from Divestiture of Businesses and Interests in Affiliates [Abstract] Prior years Prior Year Claims and Claims Adjustment Expense Variable Rate [Domain] Variable Rate [Domain] ServiceLink, excluding title premiums, escrow fees, and subservicing fees ServiceLink, Excluding Title Premiums, Escrow Fees And Subservicing Fees [Member] ServiceLink, 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Obtained in Exchange for Operating Lease Liability Credit Facility [Axis] Credit Facility [Axis] Provision for title claim losses Policyholder Benefits and Claims Incurred, Net Other intangible assets, net Intangible Assets, Net (Excluding Goodwill and Title Plants) Intangible Assets, Net (Excluding Goodwill and Title Plants) Foreign government bonds Debt Security, Government, Non-US [Member] 12 Months or Longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Preferred securities Preferred Stock [Member] Financial Instrument [Axis] Financial Instrument [Axis] Segment Information Segment Reporting Disclosure [Text Block] Impairment charges related to debt securities Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale Equity [Abstract] Equity [Abstract] Agency title insurance premiums Insurance Contracts, Agency Title Insurance Premiums [Member] Insurance Contracts, Agency Title Insurance Premiums [Member] Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] ServiceLink Holdings, LLC ServiceLink Holdings, LLC [Member] ServiceLink Holdings, LLC [Member] Document Quarterly Report Document Quarterly Report Commitments and Contingencies: Commitments and Contingencies Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Litigation Status [Domain] Litigation Status [Domain] 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 Debt Instrument [Line Items] Debt Instrument [Line Items] Class of Stock [Domain] Class of Stock [Domain] Consolidation Items [Domain] Consolidation Items [Domain] Other Other Products And Services [Member] Other Products And Services [Member] Other operating expenses Other Cost and Expense, Operating Real estate brokerage Reat Estate Brokerage [Member] Reat Estate Brokerage [Member] Policy period Contract With Customer, Policy Period Contract With Customer, Policy Period Trade receivables Accounts Receivable, after Allowance for Credit Loss Net Realized Gains (Losses) Realized Gain (Loss) On Investments And Other Financial Assets Realized Gain (Loss) On Investments And Other Financial Assets Entity File Number Entity File Number Title plants Intangible Assets, Title Plants Intangible Assets, Title Plants Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Fair Value [Abstract] Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Fair Value Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments, Excluding Discontinued Operations Income (Loss) from Equity Method Investments, Excluding Discontinued Operations FNF Group Common Stock FNF Common Stock Fidelity National Financial Group Common Stock [Member] Fidelity National Financial Group Common Stock [Member] Total title claims paid, net of recoupments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Treasury Stock Treasury Stock [Member] Segments [Axis] Segments [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Beginning balance (in shares) Ending balance (in shares) Shares, Issued Financial Instruments [Domain] Financial Instruments [Domain] Valuation of fixed maturity securities available for sale Debt Securities, Available-for-sale [Abstract] 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 Less: Treasury stock,19,923,040 shares and 16,673,040 shares as of March 31, 2020 and December 31, 2019, respectively, at cost Treasury Stock, Value Product and Service [Domain] Product and Service [Domain] Insurance [Abstract] Insurance [Abstract] Goodwill Goodwill Segments [Domain] Segments [Domain] Statement [Line Items] Statement [Line Items] Revenue from contract with customer Revenue from Contract with Customer, Excluding Assessed Tax Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Other comprehensive (loss) earnings: Other Comprehensive Income (Loss), Net of Tax [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Net earnings per share attributable to shareholders, basic (in usd per share) Earnings Per Share, Basic Cash dividends declared (in usd per share) Common Stock, Dividends, Per Share, Declared Revenues from external customers Insurance Services Revenue Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Subsidiary dividends paid to non-controlling interest shareholders Payments of Ordinary Dividends, Noncontrolling Interest Comprehensive (loss) earnings attributable to Fidelity National Financial, Inc. common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Subsequent Event Type [Axis] Subsequent Event Type [Axis] 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] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Amendment Flag Amendment Flag Fair Values of Level 3 Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Net Realized Gains (Losses) Other Long-Term Investments, Valuation, Gain (Loss) Other Long-Term Investments, Valuation, Gain (Loss) Cost Basis Cost Basis Debt Securities, Available-for-sale, Amortized Cost Changes in assets and liabilities, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] (Loss) earnings from continuing operations before income taxes and equity in earnings of unconsolidated affiliates Loss before income taxes and equity in earnings of unconsolidated affiliates Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Common stock outstanding (in shares) Common Stock, Shares, Outstanding Consolidation Items [Axis] Consolidation Items [Axis] Level 1 Fair Value, Inputs, Level 1 [Member] Interest expense Interest Expense 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 One year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis, Percent Available-for-sale Securities, Debt Maturities, Next 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Number Prepaid expenses and other assets Prepaid Expense and Other Assets Non-cash lease costs Operating Lease, Expense Notes Payable Long-term Debt [Text Block] After one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Remeasurement of lease liabilities Lessee, Operating Lease, Remeasurement Of Lease Liability Lessee, Operating Lease, Remeasurement Of Lease Liability Gross Proceeds from Sale/Maturity Proceeds from Sale of Other Assets Exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Less: Comprehensive earnings attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] One year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, 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Securities, at fair value Equity securities, at fair value Equity Securities, FV-NI After five years through ten years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis, Percent Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis, Percent Net (loss) earnings Net (loss) earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Product and Service [Axis] Product and Service [Axis] Entity Small Business Entity Small Business Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] After one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Income tax expense as a percentage of earnings before income taxes, percent Income Tax Expense As Percentage Of Earnings Before Income Taxes, Percent Income Tax Expense As 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2019 includes pledged short-term investments of $0 and $12, respectively, related to secured trust deposits Other Short-term Investments Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Net change in secured trust deposits Payments For (Proceeds From) Secured Trust Deposits Payments For (Proceeds From) Secured Trust Deposits Unsecured notes Unsecured Debt [Member] Corporate debt securities Corporate Debt Securities Corporate Debt Securities [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Income tax benefit related to 2017 amended return Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Document Fiscal Year Focus Document Fiscal Year Focus Proceeds from sales of investment securities Proceeds from Sale of Debt Securities, Available-for-sale Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Revenues: Revenues [Abstract] Litigation Case [Domain] Litigation Case [Domain] Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Net Realized Gains (Losses) Debt Securities, Available-for-sale, Realized Gain (Loss) Agency title insurance premiums Assumed Premiums Written Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Fair Value Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] Loan subservicing revenue Fees and Commissions, Mortgage Banking and Servicing Insurance contracts Insurance Contracts [Member] Insurance Contracts [Member] Dividends declared, per common share Dividends, Common Stock, Cash Unrealized Losses on Investment Securities and Fair Value, Excluding Allowance for Credit Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value, Excluding Allowance for Credit Losses [Table Text Block] Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value, Excluding Allowance for Credit Losses Real estate technology Real Estate Technology [Member] Real Estate Technology [Member] Less: Net earnings attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Accumulated other comprehensive earnings Accumulated Other Comprehensive Income (Loss), Net of Tax After five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value 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 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] Operating lease payments Operating Lease, Payments Retained Earnings Retained Earnings [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Home warranty Insurance Contracts, Home Warranty [Member] Insurance Contracts, Home Warranty [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Liabilities: Liabilities [Abstract] Document Period End Date Document Period End Date Statement [Table] Statement [Table] Entity Registrant Name Entity Registrant Name Schedule of Supplemental Cash Flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Loss on sales of investments and other assets and asset impairments, net Gain (Loss) on Investments And Disposition Of Other Assets And Asset Impairments, Net Gain (Loss) on Investments and Disposition of Other Assets And Asset Impairments, Net Purchases of investment securities Payments to Acquire Debt Securities, Available-for-sale Deferred revenue (contract liabilities) Contract with Customer, Liability Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Maximum Maximum [Member] Measurement Input Type [Domain] Measurement Input Type [Domain] Net increase (decrease) in reserve for title claim losses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Related Party [Domain] Related Party [Domain] Plaintiffs claim losses amount Loss Contingency, Damages Sought, Value Ownership [Axis] Ownership [Axis] Fixed maturity securities available for sale, at fair value, at March 31, 2020 and December 31, 2019, net of allowance for credit losses of $11 and $0, respectively, and includes pledged fixed maturity securities of $423 and $410, respectively, related to secured trust deposits Available for sale debt securities Carrying Value Total Debt Securities, Available-for-sale Schedule of Unrealized Losses on Investment Securities and the Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Stock consideration (in shares) Business Combination, Stock Consideration, Common Stock Received Per Common Stock Shares Owned Business Combination, Stock Consideration, Common Stock Received Per Common Stock Shares Owned Purchases of treasury stock Payments for Repurchase of Common Stock Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Document Information [Line Items] Document Information [Line Items] Entity Tax Identification Number Entity Tax Identification Number Amount of debt instrument Aggregate principal amount Debt Instrument, Face Amount Net earnings per share attributable to shareholders, diluted (in usd per share) Earnings Per Share, Diluted 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 Other long-term investments Other Long-Term Investments Other Long-term Investments [Member] Unrealized (loss) gain on investments and other financial instruments, net (excluding investments in unconsolidated affiliates Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Term Loan Term Loan [Member] Term Loan Trading Symbol Trading Symbol Minimum Minimum [Member] Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Distributions from unconsolidated affiliates, return of investment Proceeds from Equity Method Investment, Distribution, Return of Capital After ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Unrealized (loss) gain on foreign currency translation Other comprehensive earnings - unrealized gain (loss) on foreign Currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Unrealized gain on investments in unconsolidated affiliates tax expense Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Equity Method Investments Arising During Period, Tax Statistical Measurement [Domain] Statistical Measurement [Domain] Fixed maturity securities available for sale: Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Adjustments to reconcile net (loss) earnings to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] (Loss) 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 Distributions from unconsolidated affiliates, return on investment Proceeds from Equity Method Investment, Distribution Fair value of shares owned of related party Investment Owned, at Fair Value Short term investments, secured trust deposits Other Short-term Investments, Pledged, Customer Advances and Deposits Other Short-term Investments, Pledged, Customer Advances and Deposits Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net Realized Gains (Losses) Equity Securities, FV-NI, Realized Gain (Loss) Other title-related fees and income Other Title Related Fees And Income [Member] Other Title Related Fees And Income [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. 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. Income tax (benefit) expense Income tax (benefit) expense Income tax benefit Income Tax Expense (Benefit) Equity Securities, FV-NI, Realized Gain (Loss) [Abstract] Equity Securities, FV-NI, Realized Gain (Loss) [Abstract] Net Realized Gains (Losses) Gain (Loss) on Sale of Assets and Asset Impairment Charges Corporate and Other Corporate and other Corporate And Reconciling Items [Member] Corporate And Reconciling Items [Member] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Unrealized gain (loss) on investments and other financial instruments, tax (benefit) expense Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Gross Realized Losses Equity Securities, FV-NI, Realized Loss Fair value, discount rate Equity Securities, FV-NI, Measurement Input City Area Code City Area Code FGL Holdings FGL Holdings [Member] FGL Holdings Title premiums Premiums Written, Net 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 Claims paid, net of recoupments related to: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Net decrease (increase) in prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Title of 12(b) Security Title of 12(b) Security Net other investing activities Payments for (Proceeds from) Other Investing Activities Related Party [Axis] Related Party [Axis] Mortgage-backed/asset-backed securities Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value, Percent Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value, Percent Earnings per share Earnings Per Share [Abstract] Mortgage-backed/asset-backed securities Asset-backed Securities [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Subsidiary dividends declared to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Outstanding principal Total Long Term Debt Long-term Debt, Gross Net Realized Gains (Losses) Equity Securities, FV-NI, Valuation Gain (Loss) Equity Securities, FV-NI, Valuation Gain (Loss) ASSETS Assets [Abstract] Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Preferred stock par value (in usd per share) Preferred Stock, Par or Stated Value Per Share 5.50% Notes due September 2022 5.50% Notes, net of discount 5.50% notes due September 2022 Five Point Five Zero Percent Unsecured Notes Due September 2022 [Member] Five Point Five Zero Percent Unsecured Notes Due September 2022 [Member] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] After five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Schedule of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] One year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Title Title Subsegment [Member] Title Subsegment [Member] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Gross Proceeds from Sale/Maturity Proceeds from Sale and Maturity of Other Investments Debt Disclosure [Abstract] Debt Disclosure [Abstract] Schedule of Principal Maturities of Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' 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Principal in Year Three Escrow, title-related and other fees Other revenues Insurance Commissions and Fees Price as percent of par on offering of unsecured Notes Price As Percent Of Par On Offering Of Unsecured Notes Price As Percent Of Par On Offering Of Unsecured Notes Reserve for title claim losses Liability for Unpaid Claims and Claims Adjustment Expense, Net After one year through five years Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value, Percent Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value, Percent Revolving Credit Facility Revolving Credit Facility Due April 2022 Revolving Credit Facility Due April 2022 [Member] Revolving Credit Facility Due April 2022 [Member] Litigation Status [Axis] Litigation Status [Axis] Common stock authorized (in shares) Common Stock, Shares Authorized Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Pledged fixed maturity securities 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Adjustment Expense, Incurred Claims Gross Proceeds from Sale/Maturity Proceeds from Sale, Maturity and Collection of Investments Net Realized Gains (Losses) Gain (Loss) on Disposition of Other Financial Assets Unamortized debt issuance costs Debt Issuance Costs, Line of Credit Arrangements, Net Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Preferred stock issued (in shares) Preferred Stock, Shares Issued U.S. government and agencies US Government Agencies Debt Securities [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Other comprehensive (loss) earnings Other Comprehensive Income (Loss), Net of Tax Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Fair Value, % of Total Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity, Percent [Abstract] Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity, Percent [Abstract] Notes payable Long-term Debt Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Current year Current Year Claims and Claims Adjustment Expense Excess fair value over carrying value of long-term debt Long-term Debt, Fair Value, Amount Over Carrying Value Long-term Debt, Fair Value, Amount Over Carrying Value Unrealized (loss) gain foreign currency translation, tax (benefit) expense Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax After ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Information about Trade Receivables and Deferred Revenue Contract with Customer, Asset and Liability [Table Text Block] Other long-term investments Other Assets, Fair Value Disclosure Mortgage-backed/asset-backed securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Change in valuation of equity and preferred securities, net Unrealized Gain (Loss) on Investments Subsequent Event [Table] Subsequent Event [Table] Net change in income taxes Increase (Decrease) in Income Taxes Payable Additional Paid-in Capital Additional Paid-in Capital [Member] Revenue Recognition Revenue from Contract with Customer [Text Block] Gross Realized Losses Debt Securities, Available-for-sale, Realized Loss Deferred tax liability Deferred Income Tax Liabilities, Net Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Total assets Investments, Fair Value Disclosure Stated interest rate Debt Instrument, Interest Rate, Stated Percentage 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two Entity Address, Address Line One Entity Address, Address Line One Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Other realized gains and losses, net Gain (Loss) on Other Assets [Abstract] Gain (Loss) on Other Assets [Abstract] Floor interest rate Debt Instrument, Floor Interest Rate Debt Instrument, Floor Interest Rate 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 Business Acquisition [Axis] Business Acquisition [Axis] 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 Operating Segments Operating Segments [Member] Investments Classified by Contractual Maturity Dates Investments Classified by Contractual Maturity Date [Table Text Block] Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Weighted Average Weighted Average [Member] Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Business Acquisition [Line Items] Business Acquisition [Line Items] Entity Interactive Data Current Entity Interactive Data Current Other comprehensive earnings - unrealized gain on investments and other financial instruments Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Common stock issued (in shares) Common Stock, Shares, Issued FNF Common Stock (in shares) Entity Common Stock, Shares Outstanding Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Redeemable non-controlling interest by 21% minority holder of ServiceLink Holdings, LLC Beginning balance Ending balance Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests After one year through five years Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis, Percent Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis, Percent Net (purchases of) proceeds from sales and maturities of short-term investment securities Payments for (Proceeds from) Short-term Investments Agent commissions Insurance Commissions Direct title insurance premiums Direct Premiums Written Threatened Litigation Threatened Litigation [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Personnel costs Labor and Related Expense Revolving Credit Facility Revolving Credit Facility [Member] After ten years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value, Percent Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value, Percent Accrual for legal and regulatory matters Estimated Litigation Liability Ownership [Domain] Ownership [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] 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 [Policy Text Block] Dividends paid Payments of Ordinary Dividends, Common Stock State and political subdivisions US States and Political Subdivisions Debt Securities [Member] Schedule of Notes Payable Schedule of Long-term Debt Instruments [Table Text Block] Basis of Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Fair value of long term debt Long-term Debt, Fair Value Amortized Cost, % of Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity, Percent [Abstract] Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity, Percent [Abstract] 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] Total liabilities Liabilities Trade and notes receivables, allowance Allowance for Doubtful Accounts, Premiums and Other Receivables FNF common stock, $0.0001 par value; authorized 600,000,000 shares as of March 31, 2020 and December 31, 2019; outstanding of 272,418,216 and 275,563,436 as of March 31, 2020 and December 31, 2019, respectively, and issued of 292,341,256 and 292,236,476 as of March 31, 2020 and December 31, 2019, respectively Common Stock, Value, Issued Proceeds from calls and maturities of investment securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale 2020 (remaining) Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Fixed maturity securities available-for-sale, allowance for credit losses Allowance for Credit Loss Debt Securities, Available-for-sale, Allowance for Credit Loss Mortgage-backed/asset-backed securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Cash and cash equivalents, at March 31, 2020 and December 31, 2019 includes $306 and $384, respectively, of pledged cash related to secured trust deposits Cash and Cash Equivalents, at Carrying Value Cannae Cannae Holdings Inc. [Member] Cannae Holdings Inc. [Member] Total Realized Investment Gains (Losses) [Abstract] Direct title insurance premiums Insurance Contracts, Direct Title Insurance Premiums [Member] Insurance Contracts, Direct Title Insurance Premiums [Member] Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Weighted average shares outstanding, basic basis (in shares) Weighted Average Number of Shares Outstanding, Basic Lease assets Operating Lease, Right-of-Use Asset Investments: Investments [Abstract] Credit Loss Status [Axis] Credit Loss Status [Axis] Equity Components [Axis] Equity Components [Axis] 4.50% Notes, net of discount 4.50 % Notes Due August 2028 Four Point Five Zero Percent Unsecured Notes Due August 2028 [Member] Four Point Five Zero Percent Unsecured Notes Due August 2028 [Member] Realized gains and losses, net Gain (Loss) on Investments Additional investments in unconsolidated affiliates Payments to Acquire Equity Method Investments Fair value, Beginning of period Fair value, End of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total Fidelity National Financial, Inc. shareholders’ equity Stockholders' Equity Attributable to Parent Valuation Of Equity And Preferred Securities Valuation Of Equity And Preferred Securities [Abstract] Valuation Of Equity And Preferred Securities [Abstract] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Sales and maturities of fixed maturity securities available for sale Fixed Maturity Securities Available For Sale [Member] Fixed Maturity Securities Available For Sale [Member] Unrealized Loss, Total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Fair Value Measurements Fair Value Disclosures [Text Block] Consideration, cash paid per acquiree share (in usd per share) Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Cash Paid Per Acquiree Share Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Cash Paid Per Acquiree Share Depreciation and amortization Depreciation, Depletion and Amortization Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Ownership interest Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Preferred stock, $0.0001 par value; authorized 50,000,000 shares; issued and outstanding, none Preferred Stock, Value, Issued Variable Rate [Axis] Variable Rate [Axis] Treasury stock repurchased Treasury Stock, Value, Acquired, Cost Method Security Exchange Name Security Exchange Name Net decrease in accounts payable, accrued liabilities, deferred revenue and other Increase (Decrease) In Accounts Payable, Accrued Liabilities, Contract Liabilities, And Other Operating Liabilities Increase (Decrease) In Accounts Payable, Accrued Liabilities, Contract Liabilities, And Other Operating Liabilities Antidilutive instruments (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Document Information [Table] Document Information [Table] Litigation Case [Axis] Litigation Case [Axis] Investments in unconsolidated affiliates Equity Method Investments Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Comprehensive (loss) earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Expenses: Benefits, Losses and Expenses [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Schedule of Carrying Amount and Fair Value of Available-for-sale Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Equity Component [Domain] Equity Component [Domain] 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 Document Transition Report Document Transition Report Number of lawsuits Loss Contingency, New Claims Filed, Number Fed Funds Fed Funds Effective Rate Overnight Index Swap Rate [Member] Debt issuance costs, net Debt Issuance Costs, Net Mortgage-backed/asset-backed securities Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis, Percent Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis, Percent One year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value, Percent Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value, Percent Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Payment of contingent consideration for prior period acquisitions Payments of Distributions to Affiliates Paid-in-kind dividends Dividends, Paid-in-kind Line of Credit Line of Credit [Member] Income Statement [Abstract] Income Statement [Abstract] Other long-term investments Other Long-term Investments Interest and investment income Net Investment Income Gross Proceeds from Sale/Maturity Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment