v3.20.4
Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization $ (42,395) $ (33,118)  
Property and equipment, net 41,175 21,984  
Depreciation expense 13,100 6,500 $ 6,400
Depreciation expense for lease devices 3,100 543 940
Capitalized interest 440 473 $ 362
Land      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 236 0  
Buildings and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 4,006 2,587  
Wireless communications systems      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 49,453 34,353  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment 1,879 1,345  
Capitalized software      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 16,412 12,705  
Leased wireless devices      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 8 months    
Property, plant and equipment $ 6,989 1,139  
Accumulated depreciation and amortization (2,170) (407)  
Property and equipment, net 4,819 732  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 4,595 $ 2,973  
Maximum | Buildings and equipment      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 30 years    
Maximum | Wireless communications systems      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 20 years    
Maximum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 12 years    
Maximum | Capitalized software      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 10 years    
Maximum | Leased wireless devices      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 19 months