Other Income (Loss), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	$ 19	$ 13	$ (8)	$ 48
Realized and unrealized (loss) gain on derivatives, net (Note 6)
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	(13)	36	(64)	145
Gain on acquisition (Note 2)
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	3	0	3	0
Gain on disposition of assets, net
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	9	2	20	2
Loss on extinguishment of debt (Note 10)
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	0	(36)	(2)	(162)
Tax settlement gain
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	0	0	0	32
Equity earnings from non-consolidated affiliates
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	18	13	32	26
Foreign currency translation loss
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	0	(2)	(2)	(5)
Other
Component of Other Income (Loss), Net [Line Items]
Other income (loss), net	$ 2	$ 0	$ 5	$ 10