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Railway Operating Revenues - Schedule of Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
  Accounts receivable – net $ 1,302 $ 1,147
Customer    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
  Accounts receivable – net 817 882
Non-customer    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
  Accounts receivable – net $ 485 $ 265