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Derivatives (Derivatives - Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Derivative AOCI associated with Cash Flow Hedges Pre Tax | $ 401 | $ 351

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- Definition Derivative AOCI associated with Cash Flow Hedges Pre Tax + References No definition available. + Details
Name: | bhf_DerivativeAOCIAssociatedWithCashFlowHedgesPreTax
Namespace Prefix: | bhf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration