EARNINGS PER COMMON SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator for EPS:
Income (loss) from continuing operations	$ 9,923	$ (5,833)	$ 4,121
Less: Net income (loss) from continuing operations attributable to noncontrolling interests	535	115	821
Less: Preferred stock dividends	29	29	22
Income (loss) attributable to AIG common shareholders from continuing operations	9,359	(5,977)	3,278
Income from discontinued operations, net of income tax expense	0	4	48
Net income (loss) attributable to AIG common shareholders	$ 9,359	$ (5,973)	$ 3,326
Denominator for EPS:
Weighted average common shares outstanding - basic	854,320,449	869,309,458	876,750,264
Dilutive common shares	10,564,430	0	12,761,682
Weighted average common shares outstanding - diluted	864,884,879	869,309,458	889,511,946
Basic:
Income (loss) from continuing operations	$ 10.95	$ (6.88)	$ 3.74
Income from discontinued operations	0	0	0.05
Income (loss) attributable to AIG common shareholders	10.95	(6.88)	3.79
Diluted:
Income (loss) from continuing operations	10.82	(6.88)	3.69
Income (loss) from discontinued operations	0	0	0.05
Income (loss) attributable to AIG common shareholders	$ 10.82	$ (6.88)	$ 3.74
Dilutive shares excluded from computation of diluted earnings per share		5,401,597
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive	12,000,000.0	68,700,000	20,000,000.0