Accumulated Other Comprehensive Income - Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	$ 154
Other comprehensive income (loss) before reclassifications, net of tax	(47)
Amounts reclassified from accumulated other comprehensive income, net of tax	(18)
Other comprehensive income (loss), net of taxes	(65)	(33)
Accumulated Other Comprehensive Income (Loss), Ending balance	89
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	(62)
Other comprehensive income (loss) before reclassifications, net of tax	(5)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1)
Other comprehensive income (loss), net of taxes	(6)
Accumulated Other Comprehensive Income (Loss), Ending balance	(68)
Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	6
Other comprehensive income (loss) before reclassifications, net of tax
Amounts reclassified from accumulated other comprehensive income, net of tax
Other comprehensive income (loss), net of taxes
Accumulated Other Comprehensive Income (Loss), Ending balance	6
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	208
Other comprehensive income (loss) before reclassifications, net of tax	(42)
Amounts reclassified from accumulated other comprehensive income, net of tax	(17)
Other comprehensive income (loss), net of taxes	(59)
Accumulated Other Comprehensive Income (Loss), Ending balance	149
Post - Retirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning balance	2
Other comprehensive income (loss) before reclassifications, net of tax
Amounts reclassified from accumulated other comprehensive income, net of tax
Other comprehensive income (loss), net of taxes
Accumulated Other Comprehensive Income (Loss), Ending balance	$ 2