Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Tax Provision [Abstract]
Provision (benefit) based on international income (loss) distribution			$ (29)	$ 101
Adjustments to income tax provision [Abstract]
Asset impairments with no tax benefit			127	10
Other asset impairments			(1)	0
Finalization of prior year returns			2	2
Changes in valuation allowances			1	1
Accrual adjustments and other			0	(4)
Tax provision	$ 47	$ 65	$ 100	$ 110
Tax Rate [Abstract]
Provision (benefit) based on international income (loss) distribution (in hundredths)			23.00%	23.50%
Adjustments to income tax provision [Abstract]
Asset impairments with no tax benefit (in hundredths)			(100.50%)	2.20%
Other asset impairments (in hundredths)			0.90%	0.00%
Finalization of prior year returns (in hundredths)			(2.00%)	0.40%
Changes in valuation allowances (in hundredths)			(0.60%)	0.10%
Accrual adjustments and other (in hundredths)			0.00%	(1.00%)
Tax provision (in hundredths)			(79.20%)	25.20%