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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
depreciable_asset_class
mi
reportingUnit
operatingUnit
Dec. 31, 2023
USD ($)
Property, Plant and Equipment [Line Items]    
Operating route miles | mi 19,200  
Employees covered by collective bargaining agreements 80.00%  
Number of reportable segments | reportingUnit 1  
Number of operating segments | operatingUnit 1  
Allowance for doubtful accounts | $ $ 8 $ 7
Approximate number of depreciable asset classes used | depreciable_asset_class 75  
Equipment    
Property, Plant and Equipment [Line Items]    
Depreciation studies, period 3 years  
Roadway    
Property, Plant and Equipment [Line Items]    
Depreciation studies, period 6 years  
Intermodal    
Property, Plant and Equipment [Line Items]    
Market groups percent of total railway operating revenues 25.00%  
Agriculture, Forest And Consumer Products    
Property, Plant and Equipment [Line Items]    
Market groups percent of total railway operating revenues 21.00%  
Chemicals    
Property, Plant and Equipment [Line Items]    
Market groups percent of total railway operating revenues 18.00%  
Coal    
Property, Plant and Equipment [Line Items]    
Market groups percent of total railway operating revenues 13.00%  
Metals and construction    
Property, Plant and Equipment [Line Items]    
Market groups percent of total railway operating revenues 14.00%  
Automotive    
Property, Plant and Equipment [Line Items]    
Market groups percent of total railway operating revenues 9.00%