Schedule of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Gross goodwill			$ 2,809
Goodwill [Roll Forward]
Goodwill	$ 842	$ 691
Goodwill, Impaired, Accumulated Impairment Loss			(2,118)
Acquisition	194	203
Adjustments to the allocation of purchase price	(63)	(52)
Goodwill	973	842
Americas
Goodwill [Line Items]
Gross goodwill			1,904
Goodwill [Roll Forward]
Goodwill	479	317
Goodwill, Impaired, Accumulated Impairment Loss			(1,587)
Acquisition	77	190
Adjustments to the allocation of purchase price	(19)	(28)
Goodwill	537	479
International
Goodwill [Line Items]
Gross goodwill			905
Goodwill [Roll Forward]
Goodwill	363	374
Goodwill, Impaired, Accumulated Impairment Loss			$ (531)
Acquisition	117	13
Adjustments to the allocation of purchase price	(44)	(24)
Goodwill	$ 436	$ 363