Accumulated Other Comprehensive Income - Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	$ 154	$ 193	$ 172
Other comprehensive income (loss) before reclassifications, net of tax	(108)	(37)	11
Amounts reclassified from accumulated other comprehensive income, net of tax	(23)	(2)	10
Other comprehensive income (loss), net of taxes	(131)	(39)	21
Accumulated Other Comprehensive Income (Loss), Ending balance	23	154	193
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	(62)	(74)	(62)
Other comprehensive income (loss) before reclassifications, net of tax	6	14	(22)
Amounts reclassified from accumulated other comprehensive income, net of tax	(5)	(2)	10
Other comprehensive income (loss), net of taxes	1	12	(12)
Accumulated Other Comprehensive Income (Loss), Ending balance	(61)	(62)	(74)
Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	6	4	2
Other comprehensive income (loss) before reclassifications, net of tax	4	2	2
Other comprehensive income (loss), net of taxes	4	2	2
Accumulated Other Comprehensive Income (Loss), Ending balance	10	6	4
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	208	276	243
Other comprehensive income (loss) before reclassifications, net of tax	(107)	(68)	33
Amounts reclassified from accumulated other comprehensive income, net of tax	(17)
Other comprehensive income (loss), net of taxes	(124)	(68)	33
Accumulated Other Comprehensive Income (Loss), Ending balance	84	208	276
Post - Retirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	2	(13)	(11)
Other comprehensive income (loss) before reclassifications, net of tax	(11)	15	(2)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1)
Other comprehensive income (loss), net of taxes	(12)	15	(2)
Accumulated Other Comprehensive Income (Loss), Ending balance	$ (10)	$ 2	$ (13)