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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2025
Revenue Recognition and Deferred Revenue [Abstract] |  |
Home warranty contract, period |  | 1 year
Policy period |  | 1 year
Revenue recognized | $ 42 | $ 79

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- Definition Contract With Customer, Policy Period + References No definition available. + Details
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Balance Type: | na
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- Definition Home Warranty Contract, Period + References No definition available. + Details
Name: | fnf_HomeWarrantyContractPeriod
Namespace Prefix: | fnf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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