XML 122 R110.htm IDEA: XBRL DOCUMENT
v3.25.2

Future Policy Benefits - Schedule of Additional Information, Cohort NPR (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 USD ($)
Insurance [Abstract] |
NPR before capping | 107.00%
Reserves before NPR capping | $ 1,154
Reserves after NPR capping | 1,174
Loss Expense | $ 20

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