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Derivatives and Hedge Accounting - Derivatives not Designated as Hedging Instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | $ (130) | $ (453) | $ 1,289
Net investment income - excluding Fortitude Re funds withheld assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | $ 0 | $ 0 | $ 4
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net Investment Income | Net Investment Income | Net Investment Income
Net Investment Income - Fortitude Re Funds Withheld Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | $ 1 | $ 0 | $ (1)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net Investment Income | Net Investment Income | Net Investment Income
Net realized gains (losses) - Excluding Fortitude Re Funds Withheld Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | $ (63) | $ (172) | $ 156
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Total net realized gains (losses) | Total net realized gains (losses) | Total net realized gains (losses)
Net Realized Gains (Losses) On Fortitude Re funds Withheld Assets |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | $ (68) | $ (281) | $ 1,130
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Total net realized gains (losses) | Total net realized gains (losses) | Total net realized gains (losses)
Interest rate contracts |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | $ (6) | $ (12) | $ 37
Foreign exchange contracts |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | (52) | (175) | 143
Equity contracts |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | 0 | 1 | (9)
Commodity contracts |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | 0 | 8 | (12)
Credit contracts |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | 3 | (2) | (3)
Other contracts |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | 0 | 0 | (1)
Embedded derivatives |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total | $ (75) | $ (273) | $ 1,134

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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