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Property and Equipment, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property and Equipment, Gross $ 80,692 $ 78,263  
Less accumulated depreciation and amortization (14,978) (13,175)  
Property and equipment, net 65,714 65,088  
Right-of-use fixed assets 1,200    
Finance Lease, Right-of-Use Asset, Accumulated Amortization 395 366  
Interest costs capitalized 25 26 $ 15
Land for transportation purposes      
Property, Plant and Equipment [Line Items]      
Property and Equipment, Gross 6,431 6,305  
Track structure      
Property, Plant and Equipment [Line Items]      
Property and Equipment, Gross 27,934 26,657  
Other roadway      
Property, Plant and Equipment [Line Items]      
Property and Equipment, Gross 31,478 30,862  
Locomotives      
Property, Plant and Equipment [Line Items]      
Property and Equipment, Gross 8,496 8,440  
Freight cars and other equipment      
Property, Plant and Equipment [Line Items]      
Property and Equipment, Gross 3,808 3,746  
Computer hardware, software and other      
Property, Plant and Equipment [Line Items]      
Property and Equipment, Gross 1,518 1,337  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and Equipment, Gross $ 1,027 $ 916  
Minimum | Track structure      
Property, Plant and Equipment [Line Items]      
Useful life 15 years    
Minimum | Other roadway      
Property, Plant and Equipment [Line Items]      
Useful life 10 years    
Minimum | Locomotives      
Property, Plant and Equipment [Line Items]      
Useful life 8 years    
Minimum | Freight cars and other equipment      
Property, Plant and Equipment [Line Items]      
Useful life 8 years    
Minimum | Computer hardware, software and other      
Property, Plant and Equipment [Line Items]      
Useful life 6 years    
Maximum | Track structure      
Property, Plant and Equipment [Line Items]      
Useful life 55 years    
Maximum | Other roadway      
Property, Plant and Equipment [Line Items]      
Useful life 100 years    
Maximum | Locomotives      
Property, Plant and Equipment [Line Items]      
Useful life 37 years    
Maximum | Freight cars and other equipment      
Property, Plant and Equipment [Line Items]      
Useful life 43 years    
Maximum | Computer hardware, software and other      
Property, Plant and Equipment [Line Items]      
Useful life 15 years