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	$ (3,573)	$ (1,523)	$ (3,879)
AIG
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	200	(1,100)
Excluding Fortitude Re Funds Withheld Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(1,173)	392	(990)
Excluding Fortitude Re Funds Withheld Assets \| AIG Life \| Discontinued Operations, Disposed of by Sale
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total		5	(13)
Net realized losses on Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(99)	(172)	(90)
Net realized losses on Fortitude Re funds withheld embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(1,673)	(518)	(1,734)
Policy fees
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	65	62	64
Net investment income (loss) - Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(21)	17	(10)
Policyholder benefits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	(5)	0
Change in the Fair Value of market risk benefits, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(672)	(1,299)	(1,119)
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(54)	(750)	(397)
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(526)	339	(215)
Equity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	431	241	(120)
Credit contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	102	87	0
Other contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	62	62	64
Embedded derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(1,915)	(984)	(1,477)
Embedded derivative \| Net realized losses on Fortitude Re funds withheld embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (1,673)	$ (518)	$ (1,734)