Derivative Financial Instruments - Schedule of Total Value by Underlying Risk Recognized in Other Comprehensive Income and Reclassified from AOCI to Cost of Operations and Interest Expense, Net in Statement of Operations (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items]
Amount of (loss) gain recognized in other comprehensive income (loss)		$ 4	$ (56)	$ 16
Revenues	[1]	8,431	6,705	2,985
Cost of operations		8,210	6,104	2,449
Interest expense, net		(735)	(259)	(63)
Designated as Hedging Instrument [Member] | Foreign Exchange Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of (loss) gain recognized in other comprehensive income (loss)		(13)	(14)	16
Revenues		8
Cost of operations		2	7	$ 5
Designated as Hedging Instrument [Member] | Interest Rate Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of (loss) gain recognized in other comprehensive income (loss)		(44)	(32)
Interest expense, net		8	1
Derivatives not Designated as Hedges [Member] | Foreign Exchange Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Revenues		(2)
Cost of operations		(1)	$ (14)
Derivatives not Designated as Hedges [Member] | Interest Rate Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Interest expense, net		$ 67

[1] Intercompany amounts have been eliminated in consolidation.