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Revenues - Accounts Receivable, Net (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Accounts Receivable, net | $ 1,399 | $ 1,313
Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, gross | 1,043 | 1,067
Allowance for Credit Losses | (16) | (16)
Total Accounts Receivable, net | 1,027 | 1,051
Non-Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, gross | 387 | 279
Allowance for Credit Losses | (15) | (17)
Total Accounts Receivable, net | $ 372 | $ 262

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