Derivative Instruments Effect of Derivative Contracts on Condensed Consolidated Statement of Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	$ (31)	$ 0
Foreign Exchange Contract | Net Revenue [Member] | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	(17)	0
Foreign Exchange Contract | Operating Expense [Member] | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	(4)	(4)
Foreign Exchange Contract | Interest and Other, Net [Member] | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	$ (10)	$ 4