Property and Equipment - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	$ 30,053	$ 22,730
Internal-use software		1,400	1,300
Depreciation expense		4,949	3,616	$ 2,460
Amortization of property and equipment acquired under capital leases		2,700	1,500	826
Capital Leased Assets, Gross		12,000	7,900
Accumulated depreciation associated with capital leases		5,400	3,300
Finance Leased Assets, Gross		2,000	1,400
Accumulated depreciation associated with finance leases		199	87
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	[1]	8,215	5,763
Property and equipment, net		21,838	16,967	$ 10,949
Land and Buildings
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	9,770	7,150
Equipment and Internal-use Software
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1],[2]	18,417	14,213
Other Corporate Assets
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	334	304
Construction in Progress
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	$ 1,532	$ 1,063

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

[2] Includes internal-use software of $1.4 billion and $1.3 billion as of December 31, 2015 and 2014.