Derivative Instruments, Gain (Loss) by Hedging Relationship, Income Statement Location (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Total pre-tax gain (loss)	$ (26)	$ 7	$ 18
Cost of Sale [Member] | Derivatives not Designated as Hedges [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total pre-tax gain (loss)	(11)	7	2
Cost of Sale [Member] | Derivatives Designated as Hedges [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total pre-tax gain (loss)	(7)	1	0
Other Costs [Member] | Derivatives not Designated as Hedges [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total pre-tax gain (loss)	$ (8)	$ (1)	$ 16