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Revenues - Accounts Receivable (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Accounts Receivable, net | $ 860 | $ 986
Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Trade Accounts Receivable, gross | 644 | 790
Allowance for Doubtful Accounts | (17) | (21)
Total Accounts Receivable, net | 627 | 769
Non-Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Trade Accounts Receivable, gross | 244 | 226
Allowance for Doubtful Accounts | (11) | (9)
Total Accounts Receivable, net | $ 233 | $ 217

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