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Future Policy Benefits - Additional Information, Cohort NPR (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2023 | Dec. 31, 2022
Accounting Standards Update 2018-12 [Abstract] |  |
Net Premium Ratio before capping | 101.00% | 100.00%
Reserves before NP Ratio capping | $ 1,208 | $ 1,172
Reserves after NP Ratio capping | 1,211 | 1,173
Loss Expense | $ 2 | $ 0

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- Definition Net Premium Ratio Before Capping + References No definition available. + Details
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Namespace Prefix: | fnf_
Data Type: | dtr-types:percentItemType
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Period Type: | instant

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

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- 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
Name: | us-gaap_AccountingStandardsUpdate201812Abstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration