Accumulated Other Comprehensive Loss - Reclassification of Component of Accumulated Other Comprehensive Loss Associated with Cash Flow Hedges (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other, net		$ (10)
Income (loss) before income taxes	$ 434	396
Tax (expense) benefit	(137)	(140)
Total reclassifications for the period, Net of tax	297	256
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes	(3)	(23)
Tax (expense) benefit	1	9
Total reclassifications for the period, Net of tax	(2)	(14)
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	$ (3)	(3)
Foreign Currency Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other, net		$ (20)