Derivative Instruments (Schedule of Derivatives - Income Statement) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest rate swap [Member] | Interest Expense, Net [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	$ 3	$ 3	$ 7	$ 8
Foreign currency forward contracts [Member] | Other, Net [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	(5)	(15)	(12)	(1)
Cross-currency swap contracts [Member] | Other, Net [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	$ 6	$ (4)	$ 7	$ 6