Derivative Instruments - Effect of Derivative Contracts on Condensed Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	$ 1	$ (17)	$ 16	$ (47)
Foreign Exchange Contract | 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			34	(49)
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	13	(21)	33	(49)
Foreign Exchange Contract | Cost of net 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	1	0	1	0
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)	4	(18)	2
Interest Rate Contract | 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	24	(9)	39	(39)
Gain (loss) from hedged items attributable to hedged risk recognized in interest and other, net	(24)	9	(39)	39
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	0	0	0	0
Warrant
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) from hedged items attributable to hedged risk recognized in interest and other, net	$ (8)	$ 106	$ 105	$ 106