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F&G Insurance Subsidiary Financial Information and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Insurance [Abstract] |  |
Permitted practice, statutory surplus | $ 29 | $ 102

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- Definition Statutory Accounting Practices, Permitted Practice, Statutory Surplus, Amount + References No definition available. + Details
Name: | fnf_StatutoryAccountingPracticesPermittedPracticeStatutorySurplusAmount
Namespace Prefix: | fnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration