Property and Equipment - Components (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 238,800	$ 173,548
Total accumulated depreciation and amortization	78,519	60,434
Total property and equipment, net	160,281	113,114	$ 72,705
Land and buildings
Property, Plant and Equipment [Line Items]
Gross property and equipment	81,104	57,324
Equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment	128,683	97,224
Other assets
Property, Plant and Equipment [Line Items]
Gross property and equipment	4,118	3,772
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 24,895	$ 15,228