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, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (367)	$ (130)	$ (453)
Net Investment Income - Fortitude Re Funds Withheld Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (1)	$ 1	$ 0
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	$ (180)	$ (63)	$ (172)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	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	$ (186)	$ (68)	$ (281)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized Investment Gains (Losses)	Realized Investment Gains (Losses)	Realized Investment Gains (Losses)
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (6)	$ (6)	$ (12)
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(195)	(52)	(175)
Credit contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	3	(2)
Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(166)	(75)	(273)
Equity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	0	1
Commodity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 0	$ 0	$ 8

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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