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	Sep. 30, 2015 item $ / shares	Dec. 31, 2014 $ / shares	May. 13, 2014 $ / shares
Basis of Presentation [Line Items]
Common stock, par value (in dollars per share) | $ / shares				$ 2.5	$ 2.5
Interest rate (as a percent)			6.50%
Bonds available for sale, maturity year			2045
CallOptionMember
Basis of Presentation [Line Items]
Bonds available for sale, maturity year			2025
International Lease Finance Corporation (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	97.6
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			86.9
Number of Available For Sale Investments Sold		10.7
Cash Proceeds from Sales of AerCap | $		$ 500	$ 3,700
Aer Cap | Private Placement
Basis of Presentation [Line Items]
Equity Method Investment, Number of shares sold			15.7
Cash Proceeds from Sales of AerCap | $			$ 250
Aer Cap | Underwritten public offering
Basis of Presentation [Line Items]
Equity Method Investment, Number of shares sold			71.2
Cash Proceeds from Sales of AerCap | $			$ 3,400
Minimum
Basis of Presentation [Line Items]
Number of Countries in which the entity operates | item				100