EARNINGS PER COMMON SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator for EPS:
Income (loss) from continuing operations	$ (7,765)	$ 1,391	$ (6,111)	$ 2,328
Less: Net income from continuing operations attributable to noncontrolling interests	162	281	67	564
Less: Preferred stock dividends	8	7	15	7
Income (loss) attributable to AIG common shareholders from continuing operations	(7,935)	1,103	(6,193)	1,757
Loss from discontinued operations, net of income tax expense	(1)	(1)	(1)	(1)
Net income (loss) attributable to AIG common shareholders	$ (7,936)	$ 1,102	$ (6,194)	$ 1,756
Denominator for EPS:
Weighted average common shares outstanding - basic	866,968,305	876,382,884	870,590,968	875,885,588
Dilutive common shares	0	11,942,158	0	7,035,659
Weighted average common shares outstanding - diluted	866,968,305	888,325,042	870,590,968	882,921,247
Basic:
Income (loss) from continuing operations	$ (9.15)	$ 1.26	$ (7.11)	$ 2.00
Income from discontinued operations	0	0	0	0
Income (loss) attributable to AIG common shareholders	(9.15)	1.26	(7.11)	2.00
Diluted:
Income (loss) from continuing operations	(9.15)	1.24	(7.11)	1.99
Income (loss) from discontinued operations	0	0	0	0
Income (loss) attributable to AIG common shareholders	$ (9.15)	$ 1.24	$ (7.11)	$ 1.99
Dilutive shares excluded from computation of diluted earnings per share	3,226,882		3,939,732
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive	68,600,000	5,400,000	67,900,000	34,800,000