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Commitments and Contingencies (Details) $ in Millions |  |  |  |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) party | Mar. 24, 2023 defendant | Mar. 02, 2023 mi | Sep. 28, 2021 mi | Jun. 30, 2018 defendant | Mar. 31, 2016 mi | May 31, 2007 entity | Sep. 30, 2025 USD ($) mi | Mar. 02, 2022 party
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Casualty and catastrophic property deductible |  |  |  |  |  |  |  | $ 200 |
Casualty and non catastrophic property deductible |  |  |  |  |  |  |  | $ 175 |
Environmental |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of miles pertaining to passaic river tidal reach required to be studied by EPA | mi |  |  |  |  |  |  |  | 17 |
Number of lower miles under study | mi |  |  |  |  |  | 8 |  |  |
Number of upper miles under study | mi |  |  | 9 | 9 |  |  |  |  |
Number of parties liable | party |  |  |  |  |  |  |  |  | 8
Number of parties participating in modified CD | party | 82 |  |  |  |  |  |  |  |
Number of parties | defendant |  | 37 |  |  | 110 |  |  |  |
Environmental | Other Defendants |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Amount awarded to other party | $ 150 |  |  |  |  |  |  |  |
Pending Litigation | Fuel Surcharge Antitrust Litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Class action lawsuits filed against U.S.-based Class I railroads, excluding CSXT (number of entities) | entity |  |  |  |  |  |  | 3 |  |
Minimum | Pending Litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Possible loss for certain legal proceedings |  |  |  |  |  |  |  | $ 2 |
Maximum | Pending Litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Possible loss for certain legal proceedings |  |  |  |  |  |  |  | 63 |
Total Casualty |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Self-insured retention amount, per occurrence (up to) |  |  |  |  |  |  |  | $ 100 |

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