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Commitments and Contingencies - Narrative (Details) |  |  |  | 1 Months Ended | 12 Months Ended |
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Jan. 31, 2024 USD ($) party | Mar. 24, 2023 defendant | Mar. 02, 2023 mi | Jun. 30, 2018 defendant | Mar. 31, 2016 mi | May 31, 2007 entity claim | Dec. 31, 2023 USD ($) locomotive mi | Mar. 02, 2022 party
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Number of locomotives under the long term maintenance plan | locomotive |  |  |  |  |  |  | 1,900 |
Non-catastrophic property deductible (up to) |  |  |  |  |  |  | $ 100,000,000 |
Casualty and catastrophic property deductible (up to) |  |  |  |  |  |  | $ 75,000,000 |
Fuel Surcharge Antitrust Litigation |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Number of other U.S.-based entities mentioned in class action lawsuit | entity |  |  |  |  |  | 3 |  |
Number of consolidated class action lawsuits | claim |  |  |  |  |  | 1 |  |
Environmental Litigation |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Number of miles pertaining to Passaic River tidal reach required to be studied by EPA | mi |  |  |  |  |  |  | 17 |
Number of miles under study | mi |  |  |  |  | 8 |  |  |
Site contingency, number of upper miles under study | mi |  |  | 9 |  |  |  |  |
Site contingency, number of parties liable | party |  |  |  |  |  |  |  | 8
Number of defendants | defendant |  | 37 |  | 110 |  |  |  |
Environmental Litigation | Subsequent Event |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Number of parties participating in modified CD | party | 82 |  |  |  |  |  |  |
Environmental Litigation | Other Defendants | Subsequent Event |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party | $ 150,000,000 |  |  |  |  |  |  |
Minimum | Pending Litigation |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Range of possible loss from legal proceedings |  |  |  |  |  |  | $ 3,000,000 |
Maximum | Pending Litigation |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Range of possible loss from legal proceedings |  |  |  |  |  |  | 55,000,000 |
Casualty |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Self-insured retention amount per occurrence (up to) |  |  |  |  |  |  | $ 100,000,000 |

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