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Railway Operating Revenues - Schedule of Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
  Accounts receivable – net $ 1,102 $ 1,069
Customer    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
  Accounts receivable – net 779 787
Non-customer    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
  Accounts receivable – net $ 323 $ 282