Acquisitions, Goodwill, and Acquired Intangible Assets Summary of Goodwill Activity by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Goodwill [Line Items]
Goodwill - Beginning Balance	$ 2,655		$ 2,552
New acquisitions	715	[1]	103
Other adjustments	(51)	[2]	0	[2]
Goodwill - Ending Balance	3,319		2,655
North America
Goodwill [Line Items]
Goodwill - Beginning Balance	2,033		1,937
New acquisitions	553	[1]	99
Other adjustments	(2)	[2]	(3)	[2]
Goodwill - Ending Balance	2,584		2,033
International
Goodwill [Line Items]
Goodwill - Beginning Balance	622		615
New acquisitions	162	[1]	4
Other adjustments	(49)	[2]	3	[2]
Goodwill - Ending Balance	$ 735		$ 622

[1] Primarily includes the goodwill of Twitch.

[2] Primarily includes changes in foreign exchange rates.