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Revenues - Accounts Receivable (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Accounts Receivable, net | $ 1,106 | $ 1,010
Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, gross | 891 | 846
Allowance for Doubtful Accounts | (17) | (18)
Total Accounts Receivable, net | 874 | 828
Non-Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, gross | 241 | 190
Allowance for Doubtful Accounts | (9) | (8)
Total Accounts Receivable, net | $ 232 | $ 182

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