Property and Equipment - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	$ 42,441	$ 30,053
Internal-use software		1,400	1,400
Depreciation		6,400	4,900	$ 3,600
Amortization of property and equipment acquired under capital leases		3,800	2,700	1,500
Capital Leased Assets, Gross		17,000	12,000
Accumulated depreciation associated with capital leases		8,500	5,400
Finance Leased Assets, Gross		2,900	2,000
Accumulated depreciation associated with finance leases		361	199
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	[1]	13,327	8,215
Property and equipment, net		29,114	21,838	$ 16,967
Land and Buildings
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	13,998	9,770
Equipment and Internal-use Software
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1],[2]	25,989	18,417
Other Corporate Assets
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	649	334
Construction in Progress
Property and Equipment [Line Items]
Property, Plant and Equipment, Gross	[1]	$ 1,805	$ 1,532

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

[2] Includes internal-use software of $1.4 billion as of December 31, 2015 and 2016.