Derivatives and Hedge Accounting - Derivatives not designated as hedging instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (455)	$ (1,488)
AIG
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(13)	6
Excluding Fortitude Re Funds Withheld Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	298	(414)
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	(95)	43
Excluding Fortitude Re funds withheld embedded derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	22	(1,025)
Policy fees
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	15	16
Net Investment Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	5	(2)
Policyholder benefits and claims incurred
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	3
Change in the fair value of market risk benefits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(700)	(109)
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(367)	32
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	224	(67)
Equity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	189	83
Credit contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	23	0
Other contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	16	(127)
Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(562)	(384)
Embedded derivatives \| Fortitude Re funds withheld embedded derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 22	$ (1,025)