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Properties - Narrative (Details)
$ in Millions
12 Months Ended 21 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Mar. 26, 2021
property
phase
Property, Plant and Equipment [Line Items]          
Percentage of labor costs relating to the deconstruction of old track 20.00%        
Percentage of labor costs relating to the installation of new track 80.00%        
Percentage of assets depreciated under the group-life method 84.00%        
Properties $ 50,320 $ 48,105   $ 48,105  
Gains on sale of properties 34 238 $ 454    
Proceeds from property sale transaction 52 246 529    
Gains 34 238 454    
Impairment expense $ 2 $ 4 2    
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] Properties Properties      
Government assistance received $ 84 $ 49      
Non-freight accounts receivable 57 34      
Equipment assets          
Property, Plant and Equipment [Line Items]          
Properties $ 10,643 10,296   10,296  
Life studies, frequency period 3 years        
Equipment assets | Service Life, Salvage Value And Other          
Property, Plant and Equipment [Line Items]          
Depreciation expense   80      
Road and track assets          
Property, Plant and Equipment [Line Items]          
Properties $ 36,590 34,792   34,792  
Life studies, frequency period 6 years        
Virginia Line Segments          
Property, Plant and Equipment [Line Items]          
Number of property rights for sale | property         3
Number phases to complete property right sale transaction | phase         3
Proceeds from property sale transaction $ 0 125 400 525  
Gains $ 0 $ 144 $ 349 $ 493