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Contractholder Funds - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Insurance [Abstract]
Change in total benefits and other changes in policy reserves increase (decrease)	$ 57

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

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