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Contractholder Funds - Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Insurance [Abstract]
Change in contractholder funds	$ 24	$ 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