XML 122 R110.htm IDEA: XBRL DOCUMENT v3.25.3

Future Policy Benefits - Schedule of Additional Information, Cohort NPR (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Insurance [Abstract]
NPR before capping	105.00%
Reserves before NPR capping	$ 1,158
Reserves after NPR capping	1,172
Loss Expense	$ 14

X

- Definition

Net Premium Ratio Before Capping

+ References

No definition available.

+ Details

Name:	fnf_NetPremiumRatioBeforeCapping
Namespace Prefix:	fnf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- Definition

Reserves After NP Ratio Capping

+ References

No definition available.

+ Details

Name:	fnf_ReservesAfterNPRatioCapping
Namespace Prefix:	fnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

X

- References

No definition available.

+ Details

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