EARNINGS PER SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator for EPS:
Income (Loss) from Continuing Operations	$ 931	$ 1,110	$ 1,881	$ 2,321
Less:
Net income (loss) from continuing operations attributable to noncontrolling interests	(6)	(12)	5	14
Net income (loss) attributable to AIG common shareholders from continuing operations	937	1,122	1,876	2,307
Income (loss) from discontinued operations, net of income tax expense	0	8	(1)	8
Net income (loss) attributable to AIG common shareholders	$ 937	$ 1,130	$ 1,875	$ 2,315
Denominator for EPS:
Weighted average shares outstanding - basic	903,215,488	925,751,084	905,566,733	953,109,915
Dilutive shares	13,356,993	22,497,687	15,335,987	23,517,737
Weighted average shares outstanding - diluted	916,572,481	948,248,771	920,902,720	976,627,652
Basic:
Income (loss) from continuing operations	$ 1.04	$ 1.21	$ 2.07	$ 2.42
Income (loss) from discontinued operations	0	0.01	0	0.01
Net income (loss) attributable to AIG	1.04	1.22	2.07	2.43
Diluted:
Income (loss) from continuing operations	1.02	1.18	2.04	2.36
Income (loss) from discontinued operations	0	0.01	0	0.01
Net Income (loss) attributable to AIG	$ 1.02	$ 1.19	$ 2.04	$ 2.37
Number of shares, warrants, and options excluded from diluted shares outstanding because the effect would have been anti-dilutive	5,200,000	1,900,000	4,200,000	1,800,000