Supplemental Financial Statement Information (Property and Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 147,012	$ 126,462
Less: accumulated depreciation	(49,414)	(41,713)
Property and equipment, net	97,599	84,749
Land and buildings
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	58,881	49,732
Information technology assets
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	55,606	45,906
Construction in progress
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	23,171	23,111
Leasehold improvements
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	9,146	7,516
Furniture and fixtures
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 208	$ 197

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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