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v3.24.3

Contractholder Funds - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Insurance [Abstract] |  |
Change in total benefits and other changes in policy reserves increase (decrease) | $ (79) | $ 73

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- Definition Policyholder Benefits And Claims Incurred, Net, Life and Annuity, Change In Policy Reserves, Increase (Decrease) + References No definition available. + Details
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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