Summary of Goodwill Activity by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Goodwill [Line Items]
Goodwill - Beginning Balance	$ 1,955		$ 1,349
New acquisitions	587	[1]	615
Other adjustments	10	[2]	(9)	[2]
Goodwill - Ending Balance	2,552		1,955
North America
Goodwill [Line Items]
Goodwill - Beginning Balance	1,533		1,116
New acquisitions	403	[1]	417
Other adjustments	1	[2]
Goodwill - Ending Balance	1,937		1,533
International
Goodwill [Line Items]
Goodwill - Beginning Balance	422		233
New acquisitions	184	[1]	198
Other adjustments	9	[2]	(9)	[2]
Goodwill - Ending Balance	$ 615		$ 422

[1] Primarily includes the goodwill of Kiva.

[2] Primarily includes changes in foreign exchange.