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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	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

X

- Definition

Contract With Customer, Policy Period

+ References

No definition available.

+ Details

Name:	fnf_ContractWithCustomerPolicyPeriod
Namespace Prefix:	fnf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueRecognitionAndDeferredRevenueAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration