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v3.25.2

Contractholder Funds - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Insurance [Abstract] |  |
Change in contractholder funds | $ 26 | $ 89

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- Definition Policyholder Account Balance, Increase (Decrease) From Change In Assumptions + References No definition available. + Details
Name: | fnf_PolicyholderAccountBalanceIncreaseDecreaseFromChangeInAssumptions
Namespace Prefix: | fnf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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