Equity - Schedule of noncontrolling interest (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 19, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Noncontrolling Interest [Line Items]
Net income attributable to AIG common shareholders		$ 10,247	$ 9,359	$ (5,973)
Contributions from noncontrolling interests		133	$ 22	$ 108
Total AIG Shareholders' Equity
Noncontrolling Interest [Line Items]
Net income attributable to AIG common shareholders		10,247
Contributions from noncontrolling interests	$ 608	608
Change from Net income attributable to AIG common shareholders and changes in AIG's ownership interests		$ 10,855
IPO | Corebridge Financial Inc
Noncontrolling Interest [Line Items]
Percentage of stock sold (as a percent)	12.40%