EARNINGS PER COMMON SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator for EPS:
Income from continuing operations	$ 3,930	$ 1,654
Less: Net income (loss) from continuing operations attributable to noncontrolling interests	54	(95)
Less: Preferred stock dividends	7	7
Income attributable to AIG common shareholders from continuing operations	3,869	1,742
Income from discontinued operations, net of income tax expense	0	0
Net income attributable to AIG common shareholders	$ 3,869	$ 1,742
Denominator for EPS:
Weighted average common shares outstanding - basic	868,105,069	874,213,630
Dilutive common shares	8,164,855	4,652,583
Weighted average common shares outstanding - diluted	876,269,924	878,866,213
Basic:
Income from continuing operations	$ 4.45	$ 1.99
Income from discontinued operations	0	0
Income attributable to AIG common shareholders	4.45	1.99
Diluted:
Income (loss) from continuing operations	4.41	1.98
Income from discontinued operations	0	0
Income (loss) attributable to AIG common shareholders	$ 4.41	$ 1.98
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive	9,200,000	67,200,000