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Railway Operating Revenues - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue, payment terms |  |  | 15 days |  |
Contract liabilities | $ 0 |  | $ 0 |  | $ 0
Contract assets | 0 |  | 0 |  | 0
Other Noncurrent Receivables |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accounts receivable, net, noncurrent | $ 23,000,000 |  | $ 23,000,000 |  | $ 23,000,000
Accessorial Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accessorial services percent of total railway operating revenues | 6.00% | 5.00% | 6.00% | 5.00% |

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