Derivative Instruments - Effect of Derivative Contracts on Condensed Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	$ 32	$ 13	$ 49	$ (9)
Foreign Exchange Contract | Cost of Net Revenues and Operating Expenses | 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	19	0	51	(8)
Foreign Exchange Contract | Interest and Other, Net | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	13	13	(2)	(1)
Interest Rate Contract | Interest and Other, Net | Designated as Hedging Instrument | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	0	0	0	0
Gain (loss) from interest rate contracts designated as fair value hedges recognized in interest and other, net	56	(10)	55	(10)
Gain (loss) from hedged items attributable to hedged risk recognized in interest and other, net	$ (56)	$ 10	$ (55)	$ 10