BASIS OF PRESENTATION (Details) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended		3 Months Ended		9 Months Ended
	May 14, 2014 USD ($) shares	Aug. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($) shares	Sep. 30, 2016 USD ($) item $ / shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) item $ / shares	Sep. 30, 2015 USD ($)	Aug. 31, 2016 USD ($)	Dec. 31, 2015 $ / 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
Investment Maturity Year			2045
Interest rate (as a percent)					6.50%		6.50%
Net income (loss) on sale of properties and divested businesses				$ 128	$ (3)	$ 351	$ (10)
Call Option [Member]
Basis of Presentation [Line Items]
Investment Maturity Year			2025
ILFC
Basis of Presentation [Line Items]
Percentage of common stock agreed to be sold	100.00%
Number of shares received | shares	97.6
Total consideration	$ 7,600
NSM
Basis of Presentation [Line Items]
Total consideration								$ 201
Net income (loss) on sale of properties and divested businesses				$ 105
Minimum
Basis of Presentation [Line Items]
Number of Countries in which the entity operates | item				100		100
Aer Cap
Basis of Presentation [Line Items]
Closing price per share (in dollars per share) | $ / shares										$ 47.01
Equity Method Investment Number Of Shares Sold | shares			86.9
Cash Proceeds from Sales of AerCap		$ 500	$ 3,700
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
Non-cash consideration received from sale			$ 500
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