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

X
- 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: | debit
Period Type: | duration

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