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Railway Operating Revenues - Schedule of Account Receivables (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | $ 1,170 | $ 1,148
Customer |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | 919 | 895
Non-customer |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | $ 251 | $ 253

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