Derivative Instruments - Effect of Derivative Contracts on Condensed Consolidated Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Foreign Exchange Contract
Derivative Instruments, Gain (Loss)
Gain (loss) recognized from derivative contracts in the consolidated statement of income	$ (5)	$ 70	$ (2)
Interest and Other, Net | Warrant
Derivative Instruments, Gain (Loss)
Gain (loss) from hedged items attributable to hedged risk recognized in interest and other, net	770	133	104
Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Gain (loss) recognized from derivative contracts in the consolidated statement of income	15
Designated as Hedging Instrument | Cash Flow Hedging | Foreign Exchange Contract
Derivative Instruments, Gain (Loss)
Gain (loss) recognized from derivative contracts in the consolidated statement of income	15	81
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract
Derivative Instruments, Gain (Loss)
Gain (loss) recognized from derivative contracts in the consolidated statement of income	0
Designated as Hedging Instrument | Revenues, Net | Cash Flow Hedging | Foreign Exchange Contract
Derivative Instruments, Gain (Loss)
Gain (loss) recognized from derivative contracts in the consolidated statement of income	15	81	(8)
Designated as Hedging Instrument | Interest and Other, Net | Cash Flow Hedging | Interest Rate Contract
Derivative Instruments, Gain (Loss)
Gain (loss) from interest rate contracts designated as fair value hedges recognized in interest and other, net	0	0	0
Designated as Hedging Instrument | Interest and Other, Net | Fair Value Hedging | Interest Rate Contract
Derivative Instruments, Gain (Loss)
Gain (loss) recognized from derivative contracts in the consolidated statement of income	0	0	0
Gain (loss) from interest rate contracts designated as fair value hedges recognized in interest and other, net	0	34	(19)
Gain (loss) from hedged items attributable to hedged risk recognized in interest and other, net	0	(34)	19
Not Designated as Hedging Instrument | Interest and Other, Net | Foreign Exchange Contract
Derivative Instruments, Gain (Loss)
Gain (loss) recognized from derivative contracts in the consolidated statement of income	$ (20)	$ (11)	$ 6