Acquisitions, Goodwill, and Acquired Intangible Assets Summary of Goodwill Activity by Segment (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Jan. 01, 2015
Goodwill [Line Items]
Goodwill - Beginning Balance		$ 3,319	$ 2,655
New acquisitions		482	715	[1]
Other adjustments		42	51	[2]
Segment Reallocation	[3]				$ 0
Goodwill - Ending Balance		3,759	3,319
Amazon Web Services
Goodwill [Line Items]
Goodwill - Beginning Balance		0	0
New acquisitions		423	0	[1]
Other adjustments	[2]	(1)	0
Segment Reallocation	[3]				606
Goodwill - Ending Balance		1,028	0
North America Segment
Goodwill [Line Items]
Goodwill - Beginning Balance		2,584	2,033
New acquisitions		41	553	[1]
Other adjustments	[2]	(7)	(2)
Segment Reallocation	[3]				(606)
Goodwill - Ending Balance		2,012	2,584
International Segment
Goodwill [Line Items]
Goodwill - Beginning Balance		735	622
New acquisitions		18	162	[1]
Other adjustments	[2]	(34)	(49)
Segment Reallocation	[3]				$ 0
Goodwill - Ending Balance		$ 719	$ 735

[1] Primarily includes the goodwill of Twitch.

[2] Primarily includes changes in foreign exchange rates.

[3] In conjunction with the change in reportable segments, we reallocated goodwill on a relative fair value basis.