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