Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 31, 2011
Numerator for EPS:
Income (loss) from continuing operations	$ 11,276	$ 9,923	$ (5,833)
Less: Net income from continuing operations attributable to noncontrolling interests	999	535	115
Less: Preferred stock dividends	29	29	29
Income (loss) attributable to AIG common shareholders from continuing operations	10,248	9,359	(5,977)
Income (loss) from discontinued operations, net of income tax expense	(1)	0	4
Net income (loss) attributable to AIG common shareholders	$ 10,247	$ 9,359	$ (5,973)
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	778,621,118	854,320,449	869,309,458
Dilutive common shares (in shares)	9,320,632	10,564,430	0
Weighted average common shares outstanding - diluted (in shares)	787,941,750	864,884,879	869,309,458
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 13.16	$ 10.95	$ (6.88)
Income from discontinued operations (in dollars per share)	0	0	0
Income (loss) attributable to AIG common shareholders (in dollars per share)	13.16	10.95	(6.88)
Diluted:
Income (loss) from continuing operations (in dollars per share)	13.01	10.82	(6.88)
Income from discontinued operations (in dollars per share)	0	0	0
Net income attributable to AIG common shareholders (in dollars per share)	$ 13.01	$ 10.82	$ (6.88)
Dilutive shares excluded from computation of diluted earnings per share (in shares)			5,401,597
Warrants outstanding, term (in years)				10 years
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	24,100,000	12,000,000	68,700,000