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Railway Operating Revenues - Schedule of Account Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable – net $ 1,198 $ 1,147
Customer    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable – net 847 882
Non-customer    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable – net $ 351 $ 265