EARNINGS PER COMMON SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator for EPS:
Income (loss) from continuing operations	$ 973	$ (1,220)	$ 3,301	$ 661
Less: Net income from continuing operations attributable to noncontrolling interests	317	0	881	5
Less: Preferred stock dividends	8	0	15	0
Net income (loss) attributable to AIG common shareholders from continuing operations	648	(1,220)	2,405	656
Loss from discontinued operations, net of income tax expense	0	(39)	(1)	(40)
Net income (loss) attributable to AIG common shareholders	$ 648	$ (1,259)	$ 2,404	$ 616
Denominator for EPS:
Weighted average common shares outstanding - basic	877,009,495	895,237,359	876,262,372	902,081,555
Dilutive common shares	18,804,915	0	10,958,744	14,736,714
Weighted average common shares outstanding - diluted	895,814,410	895,237,359	887,221,116	916,818,269
Basic:
Income (loss) from continuing operations	$ 0.74	$ (1.37)	$ 2.74	$ 0.72
Income (loss) from discontinued operations	0	(0.04)	0	(0.04)
Income (loss) attributable to AIG common shareholders	0.74	(1.41)	2.74	0.68
Diluted:
Income (loss) from continuing operations	0.72	(1.37)	2.71	0.71
Income (loss) from discontinued operations	0	(0.04)	0	(0.04)
Income (loss) attributable to AIG common shareholders	$ 0.72	$ (1.41)	$ 2.71	$ 0.67
Number of shares, warrants, and options excluded from diluted shares outstanding because the effect would have been anti-dilutive	5,100,000	5,800,000	24,900,000	4,700,000
Dilutive Shares Excluded From Computation Of Diluted Earnings Per Share		13,538,168