Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator for EPS:
Income (loss) from continuing operations	$ 3,878	$ 11,274	$ 10,906
Less: Net income from continuing operations attributable to noncontrolling interests	235	1,046	539
Less: Preferred stock dividends	29	29	29
Income (loss) attributable to AIG common shareholders from continuing operations	3,614	10,199	10,338
Income (loss) from discontinued operations, net of income tax expense	0	(1)	0
Net income (loss) attributable to AIG common shareholders	$ 3,614	$ 10,198	$ 10,338
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	719,506,291	778,621,118	854,320,449
Dilutive common shares (in shares)	5,726,777	9,320,632	10,564,430
Weighted average common shares outstanding - diluted (in shares)	725,233,068	787,941,750	864,884,879
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 5.02	$ 13.10	$ 12.10
Income from discontinued operations (in dollars per share)	0	0	0
Income (loss) attributable to AIG common shareholders (in dollars per share)	5.02	13.10	12.10
Diluted:
Income (loss) from continuing operations (in dollars per share)	4.98	12.94	11.95
Income from discontinued operations (in dollars per share)	0	0	0
Net income attributable to AIG common shareholders (in dollars per share)	$ 4.98	$ 12.94	$ 11.95
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	4,400,000	24,100,000	12,000,000