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Railway Operating Revenues - Schedule of Account Receivables (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | $ 941 | $ 848
Customer |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | 736 | 629
Non-customer |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | $ 205 | $ 219

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