Property and Equipment Fixed Assets at Cost (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 22,730	[1]	$ 14,809	[1]
Total accumulated depreciation	5,763	[1]	3,860	[1]
Total property and equipment, net	16,967		10,949
Land and Buildings
Property, Plant and Equipment [Line Items]
Gross property and equipment	7,150	[1]	4,584	[1]
Equipment and Internal-use Software
Property, Plant and Equipment [Line Items]
Gross property and equipment	14,213	[1],[2]	9,274	[1],[2]
Other Corporate Assets
Property, Plant and Equipment [Line Items]
Gross property and equipment	304	[1]	231	[1]
Construction in Progress
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 1,063	[1]	$ 720	[1]

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

[2] Includes internal-use software of $1.3 billion and $1.1 billion as of December 31, 2014 and 2013.