Equity - Schedule of noncontrolling interest (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 19, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Noncontrolling Interest [Line Items]
Net income attributable to AIG common shareholders		$ 3,614	$ 10,198	$ 10,338
Contributions from noncontrolling interests		49	133	22
Total AIG Shareholders' Equity
Noncontrolling Interest [Line Items]
Net income attributable to AIG common shareholders		3,614	10,198	10,338
Contributions from noncontrolling interests	$ 497	145	497	(630)
Change from Net income attributable to AIG common shareholders and changes in AIG's ownership interests		$ 3,759	$ 10,695	$ 9,708