Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator for EPS:
Income from continuing operations	$ 481	$ 701	$ 1,753	$ 1,879
Less: Preferred stock dividends and preferred stock redemption premiums	0	7	22	22
Income attributable to AIG common shareholders from continuing operations	481	694	1,731	1,857
Income (loss) from discontinued operations, net of income tax expense	(24)	2,046	(3,580)	2,472
Less: Net income (loss) attributable to noncontrolling interests	(2)	720	475	801
Net income (loss) from discontinued operations attributable to AIG	(22)	1,326	(4,055)	1,671
Net income (loss) attributable to AIG common shareholders	$ 459	$ 2,020	$ (2,324)	$ 3,528
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	641,621,768	712,598,496	661,691,554	725,579,999
Dilutive common shares (in shares)	5,743,674	6,128,816	5,663,515	5,453,046
Weighted average common shares outstanding - diluted (in shares)	647,365,442	718,727,312	667,355,069	731,033,045
Basic:
Income from continuing operations (in dollars per share)	$ 0.75	$ 0.97	$ 2.62	$ 2.56
Income (loss) from discontinued operations (in dollars per share)	(0.03)	1.86	(6.13)	2.30
Net income (loss) attributable to AIG common shareholders (in dollars per share)	0.72	2.83	(3.51)	4.86
Diluted:
Income from continuing operations (in dollars per share)	0.74	0.97	2.59	2.54
Income (loss) from discontinued operations (in dollars per share)	(0.03)	1.84	(6.07)	2.29
Net income (loss) attributable to AIG common shareholders (in dollars per share)	$ 0.71	$ 2.81	$ (3.48)	$ 4.83
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	100,000	5,100,000	100,000	5,400,000