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Railway Operating Revenues - Schedule of Account Receivables (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | $ 1,070 | $ 976
Customer |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | 830 | 741
Non-customer |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable – net | $ 240 | $ 235

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