Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator for EPS:
Income from continuing operations	$ 524	$ 481	$ 2,366	$ 1,753
Less: Net income attributable to noncontrolling interests	5	0	5	0
Less: Preferred stock dividends and preferred stock redemption premiums	0	0	0	22
Income attributable to AIG common shareholders from continuing operations	519	481	2,361	1,731
Loss from discontinued operations, net of income tax expense	0	(24)	0	(3,580)
Less: Net income (loss) attributable to noncontrolling interests	0	(2)	0	475
Net loss from discontinued operations attributable to AIG	0	(22)	0	(4,055)
Net income (loss) attributable to AIG common shareholders	$ 519	$ 459	$ 2,361	$ (2,324)
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	553,308,504	641,621,768	573,176,050	661,691,554
Dilutive common shares (in shares)	5,211,326	5,743,674	5,245,177	5,663,515
Weighted average common shares outstanding - diluted (in shares)	558,519,830	647,365,442	578,421,227	667,355,069
Basic:
Income from continuing operations (in dollars per share)	$ 0.94	$ 0.75	$ 4.12	$ 2.62
Loss from discontinued operations (in dollars per share)	0	(0.03)	0	(6.13)
Net income (loss) attributable to AIG common shareholders (in dollars per share)	0.94	0.72	4.12	(3.51)
Diluted:
Income from continuing operations (in dollars per share)	0.93	0.74	4.08	2.59
Loss from discontinued operations (in dollars per share)	0	(0.03)	0	(6.07)
Net income (loss) attributable to AIG common shareholders (in dollars per share)	$ 0.93	$ 0.71	$ 4.08	$ (3.48)
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	139,655	94,545	140,042	108,759