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Revenues - Accounts Receivables, Net (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Accounts Receivable, net | $ 1,148 | $ 912
Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivables, gross | 951 | 716
Allowance for Credit Losses | (14) | (16)
Total Accounts Receivable, net | 937 | 700
Non-Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivables, gross | 225 | 224
Allowance for Credit Losses | (14) | (12)
Total Accounts Receivable, net | $ 211 | $ 212

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