Derivative Instruments - Effect of Derivative Contracts on Condensed Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	$ 10	$ 15
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	0	20
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	1	20
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	9	(5)
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	0	15
Gain (loss) from hedged items attributable to hedged risk recognized in interest and other, net	0	(15)
Gain (loss) recognized from derivative contracts in the condensed consolidated statement of income	0	0
Warrant | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) from hedged items attributable to hedged risk recognized in interest and other, net	$ 12	$ 113