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Derivative Instruments Schedule of Derivatives (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Foreign currency forward contracts [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross	$ 5	$ 12
Foreign currency forward contracts [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross	(14)	(17)
Cross-currency swap contracts [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross	0	(5)
Other Nonoperating Income (Expense) [Member] \| Foreign currency forward contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(115)	(22)	$ (12)
Other Nonoperating Income (Expense) [Member] \| Cross-currency swap contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 13	$ 16	$ 13