Acquisitions, Goodwill, and Acquired Intangible Assets - Allocation of Aggregate Purchase Price of Acquisitions (Detail) (USD $) In Millions, unless otherwise specified				1 Months Ended									12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 31, 2012 Kiva Systems, Inc	May 31, 2012 Kiva Systems, Inc Marketing-related		May 31, 2012 Kiva Systems, Inc Contract-based		May 31, 2012 Kiva Systems, Inc Technology Based		May 31, 2012 Kiva Systems, Inc Customer-related		Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions		Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions Marketing-related		Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions Contract-based		Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions Customer-related
Purchase Price
Cash paid, net of cash acquired				$ 613									$ 637
Existing equity interest													89
Indemnification holdbacks													25
Stock options assumed				65									20
Business acquisition, purchase price				678									771
Allocation
Goodwill	2,655	2,552	1,955	560									615
Intangible assets				193	5	[1]	3	[1]	168	[1]	17	[1]	230	[2]	130	[2]	6	[2]	94	[2]
Property and equipment				9									119
Deferred tax assets				34									49
Other assets acquired				41									68
Accounts payable													(65)
Debt													(70)
Deferred tax liabilities				(81)									(75)
Other liabilities assumed				(78)									(100)
Business acquisition, allocation				$ 678									$ 771

[1] Acquired intangible assets have estimated useful lives of between four and 10 years, with a weighted-average amortization period of five years.

[2] Amortization periods range from two to 10 years, with a weighted-average amortization period of eight years.