Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator for EPS:
Income from continuing operations	$ 2,747	$ 3,087	$ 4,351	$ 10,727
Less: Net income from continuing operations attributable to noncontrolling interests	720	339	801	1,051
Less: Preferred stock dividends	7	7	22	22
Income attributable to AIG common shareholders from continuing operations	2,020	2,741	3,528	9,654
Income (loss) from discontinued operations, net of income tax expense	0	0	0	(1)
Net income attributable to AIG common shareholders	$ 2,020	$ 2,741	$ 3,528	$ 9,653
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	712,598,496	763,051,482	725,579,999	789,888,322
Dilutive common shares (in shares)	6,128,816	8,080,919	5,453,046	9,204,234
Weighted average common shares outstanding - diluted (in shares)	718,727,312	771,132,401	731,033,045	799,092,556
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 2.83	$ 3.59	$ 4.86	$ 12.22
Income from discontinued operations (in dollars per share)	0	0	0	0
Income (loss) attributable to AIG common shareholders (in dollars per share)	2.83	3.59	4.86	12.22
Diluted:
Income (loss) from continuing operations (in dollars per share)	2.81	3.55	4.83	12.08
Income from discontinued operations (in dollars per share)	0	0	0	0
Net income attributable to AIG common shareholders (in dollars per share)	$ 2.81	$ 3.55	$ 4.83	$ 12.08
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	5,100,000	6,000,000	5,400,000	30,800,000