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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 1,046	$ 2,577	$ (1,198)	$ 9,270
Policy fees
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	17	17	50	47
Net investment income - excluding Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total			$ 0	$ 10
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)	$ 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	507	1,098	$ (4)	$ 2,364
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	988	1,744	$ (46)	$ 7,830
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)
Policyholder benefits and claims incurred
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(5)	(5)	$ (5)	$ (19)
Change in the fair value of market risk benefits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(462)	(285)	(1,192)	(962)
Net investment income - excluding Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total		8
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(666)	(528)	(750)	(2,010)
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	280	1,010	(41)	1,976
Equity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(438)	19	(513)	(107)
Commodity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(1)	4	7	(3)
Credit contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total		(3)	(1)	(4)
Other contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	16	42	49	73
Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 1,855	$ 2,033	$ 51	$ 9,345