BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) item $ / shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) item $ / shares	Sep. 30, 2018 USD ($)	Dec. 31, 2018 $ / shares
Basis of Presentation [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares	$ 2.50		$ 2.50		$ 2.5
Net income (loss) attributable to AIG	$ 656	$ (1,259)	$ 2,419	$ 616
Income from continuing operations before income tax expense	1,260	$ (1,527)	4,251	$ 952
Adjustments 2018 [Member]
Basis of Presentation [Line Items]
Net income (loss) attributable to AIG	(134)		(138)
Income from continuing operations before income tax expense	$ (169)		$ (170)
Minimum
Basis of Presentation [Line Items]
Number of Countries in which Entity Operates | item	80		80