Changes in Accumulated Other Comprehensive Loss by Component (Net of Tax) - Changes in AOCI By Components (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (1,318)
Other comprehensive income (loss) before reclassifications	0	$ 14
Cash flow hedging income (loss), net	0	1
Ending balance	(1,275)
Foreign currency adjustments and other	3	(2)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(714)	(482)
Other comprehensive income (loss) before reclassification adjustment, net of tax	40	(117)
Reclassification from other comprehensive income (loss)	(1)	0
Other comprehensive income (loss), net of tax	39	(117)
Ending balance	(675)	(599)
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(17)	(17)
Other comprehensive income (loss) before reclassification adjustment, net of tax	0	1
Ending balance	(17)	(16)
Post- employment Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(587)	(643)
Reclassification from other comprehensive income (loss)	(4)	(7)
Other comprehensive income (loss), net of tax	4	21
Ending balance	$ (583)	$ (622)