Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Other Income, Net (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Component of Other Income (Loss), Net [Line Items]
Other income, net	$ 37	$ 45	$ 29	$ 93
Realized and unrealized gain (loss) on derivatives, net (Note 6)
Component of Other Income (Loss), Net [Line Items]
Other income, net	12	26	(52)	171
(Loss) gain on acquisition (Note 2)
Component of Other Income (Loss), Net [Line Items]
Other income, net	(1)	0	2	0
Gain on disposition of assets, net
Component of Other Income (Loss), Net [Line Items]
Other income, net	19	2	39	4
Loss on extinguishment of debt (Note 10)
Component of Other Income (Loss), Net [Line Items]
Other income, net	0	0	(2)	(162)
Tax settlement gain
Component of Other Income (Loss), Net [Line Items]
Other income, net	0	0	0	32
Equity earnings from non-consolidated affiliates
Component of Other Income (Loss), Net [Line Items]
Other income, net	11	13	43	39
Foreign currency translation loss
Component of Other Income (Loss), Net [Line Items]
Other income, net	(6)	0	(8)	(5)
Other
Component of Other Income (Loss), Net [Line Items]
Other income, net	$ 2	$ 4	$ 7	$ 14