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Deferred Policy Acquisition Costs, Value of Business Acquired and Other Intangibles (Unearned Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Universal Life Insurance |  |
Deferred Revenue Arrangement [Line Items] |  |
Balance, beginning of period | $ 356 | $ 356
Capitalization | 9 | 10
Amortization | (9) | (10)
Balance, end of period | 356 | 356
ULSG |  |
Deferred Revenue Arrangement [Line Items] |  |
Balance, beginning of period | 612 | 488
Capitalization | 42 | 44
Amortization | (14) | (11)
Balance, end of period | 640 | 521
Variable Annuities |  |
Deferred Revenue Arrangement [Line Items] |  |
Balance, beginning of period | 67 | 74
Capitalization | 0 | 0
Amortization | (2) | (1)
Balance, end of period | $ 65 | $ 73

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- Definition Deferred Revenue, Amortization Expense + References No definition available. + Details
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Namespace Prefix: | bhf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred Revenue, Capitalization + References No definition available. + Details
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Namespace Prefix: | bhf_
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Balance Type: | credit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(2)) -SubTopic 210 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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Period Type: |