Derivative Instruments - Effect of Derivative Contracts on Condensed Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	$ (30)	$ 16
Foreign Exchange Contract | Revenues | 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	(28)	0
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	0	7
Foreign Exchange Contract | Interest and Other, Net | 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	0	13
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	(2)	(4)
Interest Rate Contract | Interest and Other, Net | Designated as Hedging Instrument | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) from interest rate contracts designated as fair value hedges recognized in interest and other, net	(30)	(7)
Gain (loss) from hedged items attributable to hedged risk recognized in interest and other, net	30	7
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	$ 0	$ 0