BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) item $ / shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) item $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 $ / shares
Basis of Presentation [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares	$ 2.5		$ 2.5		$ 2.5
Net income (loss) attributable to AIG	$ 937	$ 1,130	$ 1,875	$ 2,315
Income (loss) from continuing operations before income tax expense (benefit)	1,252	$ 1,667	2,479	$ 3,394
Scenario Adjustment [Member]
Basis of Presentation [Line Items]
Net income (loss) attributable to AIG	116		191
Income (loss) from continuing operations before income tax expense (benefit)	$ 148		$ 257
Minimum
Basis of Presentation [Line Items]
Number of Countries in which Entity Operates | item	80		80