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Nature of Operations and Significant Accounting Policies (Details) $ in Millions | Jun. 30, 2019 USD ($) state mi | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Total number of rail route miles | mi | 20,000 |  |
Number of states rail network serves | state | 23 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Right-of-Use Lease Asset | $ 550 |  | $ 0
Operating lease liability | $ 560 |  |
ASU Leases |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Right-of-Use Lease Asset |  | $ 534 |
Operating lease liability |  | $ 534 |

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