Acquisitions, Goodwill, and Acquired Intangible Assets Goodwill (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 25, 2014
Goodwill [Line Items]
Goodwill - January 1, 2014	$ 2,655		$ 702
New acquisitions	702	[1]
Other adjustments	(25)	[2]
Goodwill - September 30, 2014	3,332		702
North America
Goodwill [Line Items]
Goodwill - January 1, 2014	2,033
New acquisitions	544	[1]
Other adjustments	0	[2]
Goodwill - September 30, 2014	2,577
International
Goodwill [Line Items]
Goodwill - January 1, 2014	622
New acquisitions	158	[1]
Other adjustments	(25)	[2]
Goodwill - September 30, 2014	$ 755

[1] Primarily includes the goodwill of Twitch.

[2] Primarily includes changes in foreign exchange rates.