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Revenues - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
Concentration Risk [Line Items] |  |  |
Payment period after invoice date | 15 days |  |
Material contract liabilities or deferred contract costs | $ 0 |  |
Customer concentration risk | Sales revenue |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenue from regional subsidiary railroads, demurrage, switching and other incidental charges | 5.00% | 4.00% | 3.00%
Minimum |  |  |
Concentration Risk [Line Items] |  |  |
Average transit time to complete a shipment | 3 days |  |
Maximum |  |  |
Concentration Risk [Line Items] |  |  |
Average transit time to complete a shipment | 8 days |  |

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