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Railway Operating Revenues - Schedule of Account Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable – net $ 1,089 $ 1,148
Customer    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable – net 818 895
Non-customer    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accounts receivable – net $ 271 $ 253