Fair Value of Financial Instruments-Derivative Instruments, Gain (Loss) by Hedging Relationship, Income Statement Location (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Total pre-tax gain (loss)	$ 0	$ 2	$ 3	$ (5)
Cost of Sales [Member] | Derivatives Designated as Hedges Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total pre-tax gain (loss)	(1)	(1)	1	(5)
Cost of Sales [Member] | Derivatives not Designated as Hedges Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total pre-tax gain (loss)	1	0	2	0
Other Costs [Member] | Derivatives not Designated as Hedges Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total pre-tax gain (loss)	$ 0	$ 3	$ 0	$ 0