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Future Policy Benefits - Schedule of Additional Information, Cohort NPR (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Insurance [Abstract]
NPR before capping	107.00%
Reserves before NPR capping	$ 1,154
Reserves after NPR capping	1,177
Loss Expense	$ 23

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- Definition

Net Premium Ratio Before Capping

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No definition available.

+ Details

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- Definition

Premium Loss Expense, Net

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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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- Definition

Reserves After NP Ratio Capping

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No definition available.

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Namespace Prefix:	fnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Reserves Before NP Ratio Capping

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No definition available.

+ Details

Name:	fnf_ReservesBeforeNPRatioCapping
Namespace Prefix:	fnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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