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Revenues - Accounts Receivable, Net (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Accounts Receivable, net | $ 1,277 | $ 1,148
Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, gross | 1,081 | 951
Allowance for Credit Losses | (15) | (14)
Total Accounts Receivable, net | 1,066 | 937
Non-Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, gross | 226 | 225
Allowance for Credit Losses | (15) | (14)
Total Accounts Receivable, net | $ 211 | $ 211

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