EARNINGS PER COMMON SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator for EPS:
Income (loss) from continuing operations	$ 294	$ 973	$ (5,817)	$ 3,301
Less: Net income from continuing operations attributable to noncontrolling interests	11	317	78	881
Less: Preferred stock dividends	7	8	22	15
Income (loss) attributable to AIG common shareholders from continuing operations	276	648	(5,917)	2,405
Income (loss) from discontinued operations, net of income tax expense	5	0	4	(1)
Net income (loss) attributable to AIG common shareholders	$ 281	$ 648	$ (5,913)	$ 2,404
Denominator for EPS:
Weighted average common shares outstanding - basic	867,713,308	877,009,495	869,627,926	876,262,372
Dilutive common shares	5,417,642	18,804,915	0	10,958,744
Weighted average common shares outstanding - diluted	873,130,950	895,814,410	869,627,926	887,221,116
Basic:
Income (loss) from continuing operations	$ 0.31	$ 0.74	$ (6.80)	$ 2.74
Income from discontinued operations	0.01	0	0	0
Income (loss) attributable to AIG common shareholders	0.32	0.74	(6.80)	2.74
Diluted:
Income (loss) from continuing operations	0.31	0.72	(6.80)	2.71
Income from discontinued operations	0.01	0	0	0
Income (loss) attributable to AIG common shareholders	$ 0.32	$ 0.72	$ (6.80)	$ 2.71
Dilutive shares excluded from computation of diluted earnings per share			4,432,369
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive	70,900,000	5,100,000	68,900,000	24,900,000