EARNINGS PER COMMON SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator for EPS:
Income (Loss) from Continuing Operations	$ 1,391	$ 931	$ 2,328	$ 1,881
Less:
Net income from continuing operations attributable to noncontrolling interests	281	(6)	564	5
Preferred stock dividends	7	0	7	0
Net income (loss) attributable to AIG common shareholders from continuing operations	1,103	937	1,757	1,876
Loss from discontinued operations, net of income tax expense	(1)	0	(1)	(1)
Net income attributable to AIG common shareholders	$ 1,102	$ 937	$ 1,756	$ 1,875
Denominator for EPS:
Weighted average shares outstanding - basic	876,382,884	903,215,488	875,885,588	905,566,733
Dilutive shares	11,942,158	13,356,993	7,035,659	15,335,987
Weighted average shares outstanding - diluted	888,325,042	916,572,481	882,921,247	920,902,720
Basic:
Income from continuing operations	$ 1.26	$ 1.04	$ 2.00	$ 2.07
Income from discontinued operations	0	0	0	0
Net income (loss) attributable to AIG	1.26	1.04	2.00	2.07
Diluted:
Income from continuing operations	1.24	1.02	1.99	2.04
Income from discontinued operations	0	0	0	0
Net Income (loss) attributable to AIG	$ 1.24	$ 1.02	$ 1.99	$ 2.04
Number of shares, warrants, and options excluded from diluted shares outstanding because the effect would have been anti-dilutive	5,400,000	5,200,000	34,800,000	4,200,000