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Future Policy Benefits - Additional Information, Cohort NPR (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Insurance [Abstract]
Net Premium Ratio before capping	100.00%
Reserves before NP Ratio capping	$ 1,172
Reserves after NP Ratio capping	1,173
Loss Expense	$ 0

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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

+ References

No definition available.

+ Details

Name:	fnf_PremiumLossExpenseNet
Namespace Prefix:	fnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Reserves After NP Ratio Capping

+ References

No definition available.

+ Details

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

X

- Definition

Reserves Before NP Ratio Capping

+ References

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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Namespace Prefix:	us-gaap_
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