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Railway Operating Revenues - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue, payment terms | 15 days |  |
Contract assets | $ 0 |  | $ 0
Contract liabilities | $ 0 |  | $ 0
Accessorial Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accessorial services percent of total railway operating revenues | 6.00% | 7.00% |

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