Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] U.S. government and agencies US Government Agencies Debt Securities [Member] State and political subdivisions US States and Political Subdivisions Debt Securities [Member] Corporate debt securities Corporate Debt Securities [Member] Mortgage-backed/asset-backed securities Asset-backed Securities [Member] Foreign government bonds Debt Security, Government, Non-US [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Fixed maturity securities available for sale: Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Carrying Value Debt Securities, Available-for-sale Cost Basis Debt Securities, Available-for-sale, Amortized Cost Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Statement of Comprehensive Income [Abstract] Net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive earnings (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gain (loss) 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 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 Unrealized gain (loss) on foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 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 Other comprehensive earnings (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive earnings attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive earnings (loss) attributable to Fidelity National Financial Inc. Common Shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Unsecured notes Unsecured Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 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] Debt Instrument [Line Items] Debt Instrument [Line Items] Amount of debt instrument Debt Instrument, Face Amount Stated interest rate Debt Instrument, Interest Rate, Stated Percentage 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 Annual interest rate Debt Instrument, Interest Rate, Effective Percentage Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Weighted Average Weighted Average [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Other long-term investment Other Long-term Investments [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-01 Accounting Standards Update 2016-01 [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] Number of firms utilized Fair Value Measurement, Number of Firms Fair Value Measurement, Number of Firms Fair value, discount rate Equity Securities, FV-NI, Measurement Input 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] Fair value, Beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair value of assets associated with the adoption of ASU 2016-01 New Accounting Prononcement Or Change in Accounting Principle, Effect Of Change On Assets, Fair Value New Accounting Prononcement Or Change in Accounting Principle, Effect Of Change On Assets, Fair Value Transfers from Level 2 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Transfers to Level 2 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Paid-in-kind dividends Dividends, Paid-in-kind Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Sales and maturities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Net valuation loss included in earnings Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings Fair value, End of period Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Insurance [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Beginning balance Liability for Claims and Claims Adjustment Expense Change in reinsurance recoverable Increase (Decrease) in Reinsurance Recoverable Claim loss provision related to: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Current year Current Year Claims and Claims Adjustment Expense Prior years Prior Year Claims and Claims Adjustment Expense Total title claim loss provision Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Claims paid, net of recoupments related to: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Total title claims paid, net of recoupments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Ending balance of claim loss reserve for title insurance 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 Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Cannae Cannae Holdings Inc. [Member] Cannae Holdings Inc. [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Included in equity securities shares of related party (in shares) Investment Owned, Balance, Shares Fair value of shares owned of related party Investment Owned, at Fair Value Income Statement [Abstract] Statement [Table] Statement [Table] FNF Common Stock Fidelity National Financial Group Common Stock [Member] Fidelity National Financial Group Common Stock [Member] Statement [Line Items] Statement [Line Items] Revenues: Revenues [Abstract] Direct title insurance premiums Direct Premiums Written Agency title insurance premiums Assumed Premiums Written Escrow, title-related and other fees Insurance Commissions and Fees Interest and investment income Net Investment Income Realized gains and losses, net Gain (Loss) on Investments Total revenues Revenues Expenses: Benefits, Losses and Expenses [Abstract] Personnel costs Labor and Related Expense Agent commissions Insurance Commissions Other operating expenses Other Cost and Expense, Operating Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Provision for title claim losses Policyholder Benefits and Claims Incurred, Net Interest expense Interest Expense Total expenses Benefits, Losses and Expenses Earnings from continuing operations before income taxes and equity in earnings of unconsolidated affiliates Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) 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 Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments Net earnings Less: Net earnings attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Net earnings attributable to common shareholders Net Income (Loss) Attributable to Parent Earnings per share Earnings Per Share [Abstract] Net earnings (loss) per share attributable to shareholders (in usd per share) Earnings Per Share, Basic Net earnings (loss) per share attributable to shareholders (in usd per share) Earnings Per Share, Diluted Weighted average shares outstanding, basic basis (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average shares outstanding, diluted basis (in shares) Weighted Average Number of Shares Outstanding, Diluted Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] 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] Depreciation and amortization Depreciation, Depletion and Amortization Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments, Excluding Discontinued Operations Income (Loss) from Equity Method Investments, Excluding Discontinued Operations Gain on sales of investments and other assets, net Gain (Loss) on Investments and Disposition of Other Assets Gain (Loss) on Investments and Disposition of Other Assets Non-cash lease costs Operating Lease, Expense Operating lease payments Operating Lease, Payments Distributions from unconsolidated affiliates, return on investment Proceeds from Equity Method Investment, Distribution Stock-based compensation cost Share-based Compensation Change in valuation of equity and preferred securities, net Unrealized Gain (Loss) on Investments Changes in assets and liabilities, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Net decrease in trade receivables Increase (Decrease) in Accounts Receivable Net increase in prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets 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 Net decrease in reserve for title claim losses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Net change in income taxes Increase (Decrease) in Income Taxes Payable Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from sales of investment securities Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from calls and maturities of investment securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Funding of Cannae Holdings Inc. note receivable Payments for Advance to Affiliate Additions to property and equipment and capitalized software Payments To Acquire Property, Plant, and Equipment and Software Payments To Acquire Property, Plant, and Equipment and Software Purchases of investment securities Payments to Acquire Debt Securities, Available-for-sale Net proceeds from sales and maturities of (purchases of) short-term investment securities Payments for (Proceeds from) Short-term Investments Additional investments in unconsolidated affiliates Payments to Acquire Additional Interest in Subsidiaries Distributions from unconsolidated affiliates, return of investment Proceeds from Equity Method Investment, Distribution, Return of Capital Net other investing activities Payments for (Proceeds from) Other Investing Activities Other acquisitions/disposals of businesses, net of cash acquired/disposed Payments for (Proceeds from) Other Acquisitions and Disposals, Net of Cash Acquired Payments for (Proceeds from) Other Acquisitions and Disposals, Net of Cash Acquired Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Debt service payments Repayments of Long-term Debt Equity portion of debt conversions paid in cash Payment for Debt Extinguishment or Debt Prepayment Cost Dividends paid Payments of Ordinary Dividends, Common Stock Subsidiary dividends paid to non-controlling interest shareholders Payments of Ordinary Dividends, Noncontrolling Interest Exercise of stock options Proceeds from Stock Options Exercised Net change in secured trust deposits Payments For (Proceeds From) Secured Trust Deposits Payments For (Proceeds From) Secured Trust Deposits Payment of contingent consideration for prior period acquisitions Payments of Distributions to Affiliates Purchases of treasury stock Payments for Repurchase of Common Stock Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease), Excluding Cash Pledged for Customer Advances and Deposits Cash and Cash Equivalents, Period Increase (Decrease), Excluding Cash Pledged for Customer Advances and Deposits Cash and cash equivalents at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents at end of period Equity [Abstract] Dividends Stockholders' Equity Note Disclosure [Text Block] Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Revolving Credit Facility Due April 2022 Revolving Credit Facility Due April 2022 [Member] Revolving Credit Facility Due April 2022 [Member] Line of Credit Line of Credit [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Operating Leases term Lessee, Operating Lease, Term of Contract Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Options to renew Lessee, Operating Lease, Number Of Options To Renew Lessee, Operating Lease, Number Of Options To Renew Basis spread on variable rate (as percent) Debt Instrument, Basis Spread on Variable Rate Weighted average discount rate, percent Operating Lease, Weighted Average Discount Rate, Percent Operating lease cost Operating Lease, Cost Future Payments Under Operating Lease Arrangements Accounted for Under ASC Topic 842 Lessee, Operating Lease, Liability, Maturity [Table Text Block] Future Payments Under Operating Leases Accounted for Under ASC Topic 840 Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Cash paid for: Supplemental Cash Flow Information [Abstract] Interest Interest Paid, Including Capitalized Interest, Operating and Investing Activities Income taxes Income Taxes Paid, Net Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] 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 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 Lease liabilities recognized in exchange for lease right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Remeasurement of lease liabilities Lessee, Operating Lease, Remeasurement Of Lease Liability Lessee, Operating Lease, Remeasurement Of Lease Liability 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future minimum operating lease payments Operating Leases, Future Minimum Payments Due Revenue from Contract with Customer [Abstract] Revenue Recognition Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Title Title Subsegment [Member] Title Subsegment [Member] Corporate and other Corporate And Reconciling Items [Member] Corporate And Reconciling Items [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Title premiums Premiums Written, Net Other revenues Revenues from external customers Insurance Services Revenue Interest and investment income, including realized gains and losses Net Investment Income and Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments Net Investment Income and Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments Earnings (loss) from continuing operations, before income taxes and equity in earnings (loss) of unconsolidated affiliates Income tax expense (benefit) Equity in earnings of unconsolidated affiliates Assets Assets Goodwill Goodwill Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Cannae Revolver Affiliated Entity [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Borrowing Under Line Of Credit Borrowing Under Line Of Credit [Member] Borrowing Under Line Of Credit [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Revolver note issued aggregate principal (up to) Line of Credit Facility, Maximum Borrowing Capacity Basis spread on variable rate (as percent) Matures on anniversary of the date of the revolver note (in years) Debt Instrument, Term Automatic extension for additional term (in years) Debt Instrument, Term Of Automatic Extension Debt Instrument, Term Of Automatic Extension Borrowings under Revolver Advances to Affiliate Trade receivables Accounts Receivable, Net Deferred revenue (contract liabilities) Contract with Customer, Liability Policy period Contract With Customer, Policy Period Contract With Customer, Policy Period Revenue recognized Contract with Customer, Liability, Revenue Recognized Maturities of Long-term Debt [Abstract] 2019 (remaining) Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total Long Term Debt Long-term Debt, Gross Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Information about Trade Receivables and Deferred Revenue Contract with Customer, Asset and Liability [Table Text Block] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] ASU 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Lease right-of-use asset Operating Lease, Right-of-Use Asset Lease liability Operating Lease, Liability Prepaid expenses and other assets Prepaid Expense and Other Assets Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Unrealized gain (loss) on investments and other financial instruments, tax expense (benefit) Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax 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 Unrealized (loss) gain foreign currency translation, tax expense (benefit) Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Reclassification adjustment for change in unrealized gains and losses included in net earnings, tax (benefit) expense (less than in 2018) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Summary of Reserve for Claims Losses Insurance Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Direct title insurance premiums Insurance Contracts, Direct Title Insurance Premiums [Member] Insurance Contracts, Direct Title Insurance Premiums [Member] Agency title insurance premiums Insurance Contracts, Agency Title Insurance Premiums [Member] Insurance Contracts, Agency Title Insurance Premiums [Member] Home warranty Insurance Contracts, Home Warranty [Member] Insurance Contracts, Home Warranty [Member] Insurance contracts Insurance Contracts [Member] Insurance Contracts [Member] Escrow fees Escrow Fees [Member] Escrow Fees [Member] Other title-related fees and income Other Title Related Fees And Income [Member] Other Title Related Fees And Income [Member] ServiceLink, excluding title premiums, escrow fees, and subservicing fees ServiceLink, Excluding Title Premiums, Escrow Fees And Subservicing Fees [Member] ServiceLink, Excluding Title Premiums, Escrow Fees And Subservicing Fees [Member] Real estate technology Reat Estate Brokerage [Member] Reat Estate Brokerage [Member] Real estate brokerage Real Estate Technology [Member] Real Estate Technology [Member] Other Other Products And Services [Member] Other Products And Services [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue from contract with customer Revenue from Contract with Customer, Excluding Assessed Tax Loan subservicing revenue Fees and Commissions, Mortgage Banking and Servicing Statement of Financial Position [Abstract] Preferred securities Preferred Stock [Member] Equity securities ASSETS Assets [Abstract] Investments: Investments [Abstract] Fixed maturity securities available for sale, at fair value, at March 31, 2019 and December 31, 2018 includes pledged fixed maturity securities of $423 and $418, respectively, related to secured trust deposits Securities, at fair value Equity Securities, FV-NI Investments in unconsolidated affiliates Equity Method Investments Other long-term investments Other Long-term Investments Short-term investments, at March 31, 2019 and December 31, 2018 includes short-term investments of $2 and $8, respectively, related to secured trust deposits Other Short-term Investments Total investments Investments Cash and cash equivalents, at March 31, 2019 and December 31, 2018 includes $300 and $412, respectively, of pledged cash related to secured trust deposits Cash and Cash Equivalents, at Carrying Value Trade and notes receivables, net of allowance of $19 at March 31, 2019 and December 31, 2018 Accounts and Notes Receivable, Net Note receivable from Cannae Holdings, Inc., see Note A Prepaid expenses and other assets Lease assets, see Note K Other intangible assets, net Intangible Assets, Net (Excluding Goodwill and Title Plants) Intangible Assets, Net (Excluding Goodwill and Title Plants) Title plants Intangible Assets, Title Plants Intangible Assets, Title Plants Property and equipment, net Property, Plant and Equipment, Net Income taxes receivable Income Taxes Receivable Total assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Accounts payable and accrued liabilities Notes payable Long-term Debt Reserve for title claim losses Liability for Unpaid Claims and Claims Adjustment Expense, Net Secured trust deposits Customer Advances and Deposits Lease liabilities, see Note K Income taxes payable Taxes Payable Deferred tax liability Deferred Income Tax Liabilities, Net Total liabilities Liabilities Commitments and Contingencies: Commitments and Contingencies Redeemable non-controlling interest by 21% minority holder of ServiceLink Holdings, LLC Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] FNF common stock, $0.0001 par value; authorized 487,000,000 shares as of March 31, 2019 and December 31, 2018; outstanding of 274,908,676 and 275,373,834 as of March 31, 2019 and December 31, 2018, respectively, and issued of 289,647,896 and 289,601,523 as of March 31, 2019 and December 31, 2018, respectively Common Stock, Value, Issued Preferred stock, $0.0001 par value; authorized 50,000,000 shares; issued and outstanding, none Preferred Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive earnings (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Less: Treasury stock, 14,739,220 shares and 14,227,689 shares as of March 31, 2019 and December 31, 2018, respectively, at cost Treasury Stock, Value Total Fidelity National Financial, Inc. shareholders’ equity Stockholders' Equity Attributable to Parent Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities, redeemable non-controlling interest and equity Liabilities and Equity Schedule of Supplemental Cash Flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] ServiceLink Holdings, LLC ServiceLink Holdings, LLC [Member] ServiceLink Holdings, LLC [Member] Pledged fixed maturity securities Available-for-sale Securities, Pledged, Customer Advances And Deposits Available-for-sale Securities, Pledged, Customer Advances And Deposits Short term investments, secured trust deposits Other Short-term Investments, Pledged, Customer Advances and Deposits Other Short-term Investments, Pledged, Customer Advances and Deposits Pledged cash, secured trust deposits Cash, Pledged, Customer Advances And Deposits Cash, Pledged, Customer Advances And Deposits Trade and notes receivables, allowance Allowance for Doubtful Accounts, Premiums and Other Receivables Ownership interest Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common stock authorized (in shares) Common Stock, Shares Authorized Common stock outstanding (in shares) Common Stock, Shares, Outstanding Common stock issued (in shares) Common Stock, Shares, Issued Preferred stock par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Preferred stock issued (in shares) Preferred Stock, Shares Issued Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Treasury stock, at cost (in shares) Treasury Stock, Shares Antidilutive options (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Unsecured notes, net of discount, interest payable semi-annually at 4.50%, due August 2028 Unsecured notes, net of discount, interest payable semi-annually at 5.50%, 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] Revolving Credit Facility, unsecured, unused portion of $800 Unused portion Line of Credit Facility, Remaining Borrowing Capacity Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Values of Level 3 Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Leases Lessee, Operating Leases [Text Block] Commitments and Contingencies Disclosure [Abstract] Accrual for legal and regulatory matters Estimated Litigation Liability Sales and maturities of fixed maturity securities available for sale Fixed Maturity Securities Available For Sale [Member] Fixed Maturity Securities Available For Sale [Member] Sales and maturities of fixed maturity securities available for sale Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] Gross Realized Gains Debt Securities, Available-for-sale, Realized Gain Gross Realized Losses Debt Securities, Available-for-sale, Realized Loss Net Realized Gains (Losses) Debt Securities, Available-for-sale, Realized Gain (Loss) Gross Proceeds from Sale/Maturity Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Equity Securities, FV-NI, Realized Gain (Loss) [Abstract] Equity Securities, FV-NI, Realized Gain (Loss) [Abstract] Gross Realized Gains Equity Securities, FV-NI, Realized Gain Gross Realized Losses Equity Securities, FV-NI, Realized Loss Net Realized Gains (Losses) Equity Securities, FV-NI, Realized Gain (Loss) Gross Proceeds from Sale/Maturity Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment Valuation Of Equity And Preferred Securities Valuation Of Equity And Preferred Securities [Abstract] Valuation Of Equity And Preferred Securities [Abstract] Net Realized Gains (Losses) Equity Securities, FV-NI, Valuation Gain (Loss) Equity Securities, FV-NI, Valuation Gain (Loss) Valuation of other long term investments Other Long Term Investments [Abstract] Other Long Term Investments [Abstract] Net Realized Gains (Losses) Other Long-Term Investments, Valuation, Gain (Loss) Other Long-Term Investments, Valuation, Gain (Loss) Impairment of lease assets Property, Plant and Equipment [Abstract] Net Realized Gains (Losses) Operating Lease, Impairment Loss Other realized gains and losses, net Gain (Loss) on Other Assets [Abstract] Gain (Loss) on Other Assets [Abstract] Net Realized Gains (Losses) Gain (Loss) on Disposition of Other Financial Assets Gross Proceeds from Sale/Maturity Proceeds from Sale of Other Assets Total Realized Investment Gains (Losses) [Abstract] Net Realized Gains (Losses) Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments Gross Proceeds from Sale/Maturity Proceeds from Sale, Maturity and Collection of Investments Schedule of Notes Payable Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Principal Maturities of Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] Basis of Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Level 2 Fair Value, Inputs, Level 2 [Member] Fair value of long term debt Long-term Debt, Fair Value 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 Debt issuance costs, net Debt Issuance Costs, Net 5.50% notes due September 2022 Aggregate principal amount Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business FNF Common Stock (in shares) Entity Common Stock, Shares Outstanding Basis of Financial Statements Basis of Accounting, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Insurance Premiums Revenue Recognition Revenue from Contract with Customer [Policy Text Block] 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] Revenue Recognition, Other Revenue Recognition, Other, Policy [Policy Text Block] Revenue Recognition, Other, Policy [Policy Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Level 1 Fair Value, Inputs, Level 1 [Member] 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] Available for sale debt securities Equity securities, at fair value Other long-term investment Other Assets, Fair Value Disclosure Total assets Investments, Fair Value Disclosure Number of firms utilized Available-for-sale Securities, Number of Firms Available-for-sale Securities, Number of Firms Schedule of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Notes Payable Long-term Debt [Text Block] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Cash dividends declared (in usd per share) Common Stock, Dividends, Per Share, Declared Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Investments Investments in Debt and Equity Instruments, Cash and Cash Equivalents, Unrealized and Realized Gains (Losses) [Text Block] Schedule of Carrying Amount and Fair Value of Available-for-sale Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Investments Classified by Contractual Maturity Dates Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Temporary Impairment Losses, Investments Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Realized Gains and Losses and Proceeds From Sales on Investments and Other Assets Gain (Loss) on Securities [Table Text Block] Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 12 Months or Longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Total Debt Securities, Available-for-sale, Unrealized Loss Position Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 Months or Longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 2019 (remaining) Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total operating lease payments, undiscounted Lessee, Operating Lease, Liability, Payments, Due Less: interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lease liability, at present value Line of credit facility Outstanding principal Unamortized debt issuance costs Debt Instrument, Unamortized Discount Remaining borrowing capacity Statement of Stockholders' Equity [Abstract] FNF Group Common Stock Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Earnings (Loss) AOCI Attributable to Parent [Member] Treasury Stock Treasury Stock [Member] Non-controlling Interests Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Shares, Issued Beginning balance Adjustment for cumulative effect for adoption of ASU 2016-01 Cumulative Effect of New Accounting Principle in Period of Adoption Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Treasury stock repurchased (in shares) Treasury Stock, Shares, Acquired Treasury stock repurchased Treasury Stock, Value, Acquired, Cost Method Other comprehensive earnings — unrealized gain (losses) on investments and other financial instruments Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Other comprehensive earnings — unrealized gain on investments in unconsolidated affiliates Other comprehensive earnings — unrealized gain on foreign currency translation Equity portion of debt conversions settled in cash Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Dividends declared, per common share Dividends, Common Stock, Cash Acquisitions of non-controlling interests Noncontrolling Interest, Increase from Business Combination Subsidiary dividends declared to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ending balance (in shares) Ending balance Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Beginning balance Ending balance Segment Information Segment Reporting Disclosure [Text Block] Amortized Cost Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] One year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost 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 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 After ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Mortgage-backed/asset-backed securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 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] 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 Rolling Twelve Months, Amortized Cost Basis, Percent 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 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 After ten years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis, Percent Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis, Percent 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 Total Available-for-sale Debt Securities, Amortized Cost Basis, Percent Available-for-sale Debt Securities, Amortized Cost Basis, Percent Fair Value Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] One year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 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 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 After ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Mortgage-backed/asset-backed securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Total 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] 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 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 After five years through ten years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value, Percent Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value, Percent 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 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 Total Available-for-sale Securities, Debt Securities, Percent Available-for-sale Securities, Debt Securities, Percent Impairment charges related to investments Other than Temporary Impairment Losses, Investments Available-for-sale, amount held with previously recognized other than temporary impairments Available-for-sale, Amount Held with Previously Recognized Other Than Temporary Impairments Available-for-sale, Amount Held with Previously Recognized Other Than Temporary Impairments Summary of the Reserve for Claim Losses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]