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Property and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment PROPERTY AND EQUIPMENT
Property and equipment, at cost, consisted of the following (in millions):
 
 December 31,
 20192020
Gross property and equipment (1):
Land and buildings$39,223 $57,324 
Equipment71,310 97,224 
Other assets3,111 3,772 
Construction in progress6,036 15,228 
Gross property and equipment119,680 173,548 
Total accumulated depreciation and amortization (1)46,975 60,434 
Total property and equipment, net$72,705 $113,114 
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(1)Includes the original cost and accumulated depreciation of fully-depreciated assets.
Depreciation and amortization expense on property and equipment was $12.1 billion, $15.1 billion, and $16.2 billion which includes amortization of property and equipment acquired under finance leases of $7.3 billion, $10.1 billion, and $8.5 billion for 2018, 2019, and 2020.