Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	$ (80)
Other comprehensive income before reclassifications, net of tax	12
Amounts reclassified from accumulated other comprehensive loss net of tax	2
Other comprehensive income, net of tax expense	14	$ 69
Accumulated Other Comprehensive Income (Loss), Ending balance	(66)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	(40)
Amounts reclassified from accumulated other comprehensive loss net of tax	2
Other comprehensive income, net of tax expense	2
Accumulated Other Comprehensive Income (Loss), Ending balance	(38)
Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	13
Other comprehensive income before reclassifications, net of tax	1
Other comprehensive income, net of tax expense	1
Accumulated Other Comprehensive Income (Loss), Ending balance	14
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	(47)
Other comprehensive income before reclassifications, net of tax	10
Other comprehensive income, net of tax expense	10
Accumulated Other Comprehensive Income (Loss), Ending balance	(37)
Post - Retirement Benefit Obligation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	(6)
Other comprehensive income before reclassifications, net of tax	1
Other comprehensive income, net of tax expense	1
Accumulated Other Comprehensive Income (Loss), Ending balance	$ (5)