BASIS OF PRESENTATION (Details) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended		3 Months Ended								12 Months Ended
	May. 14, 2014 USD ($) shares	Aug. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($) shares	Dec. 31, 2015 USD ($) item $ / shares	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) $ / shares	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) item $ / shares	Dec. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($) $ / shares	May. 13, 2014 $ / shares
Basis of Presentation [Line Items]
Common stock, par value (in dollars per share) | $ / shares				$ 2.5				$ 2.5				$ 2.5	$ 2.5
Closing price per share (in dollars per share) | $ / shares				$ 61.97				$ 56.01				$ 61.97	$ 56.01	$ 51.05
Investment Maturity Year			2045
Interest rate (as a percent)			6.50%			6.50%
Net income (loss) attributable to AIG				$ (1,841.0)	$ (231.0)	$ 1,800.0	$ 2,468.0	$ 655.0	$ 2,192.0	$ 3,073.0	$ 1,609.0	$ 2,196.0	$ 7,529.0	$ 9,085.0
Income (loss) from continuing operations before income tax expense (benefit)				(2,932.0)	(115.0)	2,552.0	3,776.0	729.0	3,019.0	4,480.0	2,273.0	3,281.0	10,501.0	9,368.0
Adjustment
Basis of Presentation [Line Items]
Net income (loss) attributable to AIG				(193.0)	$ (36.0)	$ 15.0	$ (16.0)	$ 25.0	$ (61.0)	$ 13.0	$ (28.0)	(156.0)	$ (51.0)	$ 78.0
Income (loss) from continuing operations before income tax expense (benefit)				(308.0)								(376.0)
Operating Income Loss				$ (122.0)								$ (235.0)
Call Option [Member]
Basis of Presentation [Line Items]
Investment Maturity Year			2025
Minimum
Basis of Presentation [Line Items]
Number of Countries in which the entity operates | item				100								100
ILFC
Basis of Presentation [Line Items]
Consideration in cash	$ 7.6
Aer Cap
Basis of Presentation [Line Items]
Closing price per share (in dollars per share) | $ / shares															$ 47.01
Number of shares received | shares	97.6
Equity Method Investment Number Of Shares Sold | shares			86.9
Cash Proceeds from Sales of AerCap		$ 500.0	$ 3,700.0
Ordinary shares of AerCap remaining | shares		10.7
Aer Cap | Private Placement [Member]
Basis of Presentation [Line Items]
Equity Method Investment Number Of Shares Sold | shares			15.7
Cash Proceeds from Sales of AerCap			$ 250.0
Aer Cap | Underwritten Public Offering [Member]
Basis of Presentation [Line Items]
Equity Method Investment Number Of Shares Sold | shares			71.2
Cash Proceeds from Sales of AerCap			$ 3,400.0