Derivatives and Hedge Accounting - Derivatives not designated as hedging instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (264)	$ (563)	$ (719)	$ (2,051)
AIG
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	49	(246)	36	(240)
Excluding Fortitude Re Funds Withheld Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(129)	9	169	(405)
Excluding Fortitude Re Funds Withheld Assets \| AIG Life \| Discontinued Operations, Disposed of by Sale
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total			5
Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(37)	(85)	(132)	(42)
Fortitude Re funds withheld embedded derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	36	122	58	(903)
Policy fees
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	14	16	29	32
Net Investment Income (Loss)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	6	0	11	(2)
Policyholder benefits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	(3)	0	0
Change in the Fair Value of market risk benefits, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(154)	(622)	(854)	(731)
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	3	(148)	(364)	(116)
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(60)	(123)	164	(190)
Equity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	14	(131)	203	(48)
Credit contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	3	0	26	0
Other contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	15	152	31	25
Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(275)	(435)	(837)	(819)
Embedded derivatives \| Fortitude Re funds withheld embedded derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 36	$ 122	$ 58	$ (903)