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F&G Reinsurance - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Reinsurance Disclosures [Abstract] |  |
Reinsurance risk charge fee | $ 10 | $ 10

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- Definition Reinsurance Risk Charge Fee + References No definition available. + Details
Name: | fnf_ReinsuranceRiskChargeFee
Namespace Prefix: | fnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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