BASIS OF PRESENTATION (Details) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended
	May 14, 2014 USD ($) shares	Aug. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($) shares	Jun. 30, 2016 item $ / shares	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
Investment Maturity Year			2045
Interest rate (as a percent)			6.50%
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%
Consideration in cash | $	$ 7,600
Number of shares received | shares	97.6
Minimum
Basis of Presentation [Line Items]
Number of Countries in which the entity operates | item				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