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Revenues - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Accounts Receivable, net | $ 1,036 | $ 970
Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Receivables gross | 844 | 810
Allowance for Doubtful Accounts | (17) | (17)
Total Accounts Receivable, net | 827 | 793
Non-Freight Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Receivables gross | 218 | 186
Allowance for Doubtful Accounts | (9) | (9)
Total Accounts Receivable, net | $ 209 | $ 177

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