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Derivatives and Hedge Accounting - Derivatives not Designated as Hedging Instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total | $ (62) | $ (152) | $ (266) | $ (220)
Net Investment Income - Fortitude Re Funds Withheld Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total | $ 0 | $ 0 | $ (1) | $ 0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net Investment Income | 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 | $ (10) | $ 7 | $ (136) | $ (62)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) | Realized Investment Gains (Losses)
Net Realized Gains (Losses) On Fortitude Re funds Withheld Assets |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total | $ (52) | $ (159) | $ (129) | $ (158)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) | Realized Investment Gains (Losses)
Interest rate contracts |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total | $ 0 | $ (1) | $ (5) | $ (3)
Foreign exchange contracts |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total | (8) | 3 | (152) | (62)
Credit contracts |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total | 0 | 3 | 0 | 3
Embedded derivatives |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Total | $ (54) | $ (157) | $ (109) | $ (158)

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