Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	$ 23	$ 154	$ 193
Other comprehensive income (loss) before reclassifications, net of tax	(134)	(108)	(37)
Amounts reclassified from accumulated other comprehensive income, net of tax	(16)	(23)	(2)
Other comprehensive income (loss), net of taxes	(150)	(131)	(39)
Accumulated Other Comprehensive Income (Loss), Ending balance	(127)	23	154
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	(61)	(62)	(74)
Other comprehensive income (loss) before reclassifications, net of tax	30	6	14
Amounts reclassified from accumulated other comprehensive income, net of tax	(21)	(5)	(2)
Other comprehensive income (loss), net of taxes	9	1	12
Accumulated Other Comprehensive Income (Loss), Ending balance	(52)	(61)	(62)
Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	10	6	4
Other comprehensive income (loss) before reclassifications, net of tax	(2)	4	2
Other comprehensive income (loss), net of taxes	(2)	4	2
Accumulated Other Comprehensive Income (Loss), Ending balance	8	10	6
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	84	208	276
Other comprehensive income (loss) before reclassifications, net of tax	(164)	(107)	(68)
Amounts reclassified from accumulated other comprehensive income, net of tax	5	(17)
Other comprehensive income (loss), net of taxes	(159)	(124)	(68)
Accumulated Other Comprehensive Income (Loss), Ending balance	(75)	84	208
Post - Retirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	(10)	2	(13)
Other comprehensive income (loss) before reclassifications, net of tax	2	(11)	15
Amounts reclassified from accumulated other comprehensive income, net of tax		(1)
Other comprehensive income (loss), net of taxes	2	(12)	15
Accumulated Other Comprehensive Income (Loss), Ending balance	$ (8)	$ (10)	$ 2