Property and Equipment - Fixed Assets at Cost (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 14,809	[1]	$ 9,582	[1]
Total accumulated depreciation	3,860	[1]	2,522	[1]
Total property and equipment, net	10,949		7,060
Land and Buildings
Property, Plant and Equipment [Line Items]
Gross property and equipment	4,584	[1]	2,966	[1]
Equipment and Internal-use Software
Property, Plant and Equipment [Line Items]
Gross property and equipment	9,274	[1],[2]	6,228	[1],[2]
Other Corporate Assets
Property, Plant and Equipment [Line Items]
Gross property and equipment	231	[1]	174	[1]
Construction in Progress
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 720	[1]	$ 214	[1]

[1] Excludes the original cost and accumulated depreciation of fully-depreciated assets.

[2] Includes internal-use software of $1.1 billion and $866 million as of December 31, 2013 and 2012.