Equity - Schedule of noncontrolling interest (Details) - USD ($) $ in Millions				3 Months Ended		9 Months Ended
	Jun. 26, 2023	Jun. 12, 2023	Sep. 19, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Noncontrolling Interest [Line Items]
Net income attributable to AIG common shareholders				$ 2,020	$ 2,741	$ 3,528	$ 9,653
Contributions from noncontrolling interests				8	$ 17	35	$ 22
Total AIG Shareholders' Equity
Noncontrolling Interest [Line Items]
Net income attributable to AIG common shareholders				2,020		3,528
Contributions from noncontrolling interests	$ (15)	$ 71	$ 497	(6)		(92)
Change from Net income attributable to AIG common shareholders and changes in AIG's ownership interests				$ 2,014		$ 3,436