Commitments and Contingencies - Narrative (Details)						1 Months Ended			12 Months Ended
	Oct. 02, 2025 entity	Jan. 31, 2024 USD ($) party	Mar. 24, 2023 defendant	Mar. 02, 2023 mi	Sep. 28, 2021 mi	Jun. 30, 2018 defendant	Mar. 31, 2016 mi	May 31, 2007 entity	Dec. 31, 2025 USD ($) locomotive mi	Mar. 02, 2022 party
Other Commitments [Line Items]
Number of locomotives to be purchased, 2026-2028 | locomotive									100
Number of locomotives to be serviced under long-term maintenance and rebuild program | locomotive									1,900
Casualty and non catastrophic property deductible									$ 200,000,000
Casualty and catastrophic property deductible									$ 175,000,000
Environmental Litigation
Other Commitments [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	9
Site contingency, number of parties liable | party										8
Number of parties participating in modified CD | party		82
Number of defendants | defendant			37			110
Environmental Litigation | Other Defendants
Other Commitments [Line Items]
Litigation settlement, amount awarded to other party		$ 150,000,000
Environmental Litigation | Occidental Petroleum Corporation
Other Commitments [Line Items]
Number of entities | entity	2
Pending Litigation | Fuel Surcharge Antitrust Litigation
Other Commitments [Line Items]
Number of other U.S.-based entities mentioned in class action lawsuit | entity								3
Minimum | Pending Litigation
Other Commitments [Line Items]
Range of possible loss from legal proceedings									$ 2,000,000
Maximum | Pending Litigation
Other Commitments [Line Items]
Range of possible loss from legal proceedings									72,000,000
Total Casualty
Other Commitments [Line Items]
Self-insured retention amount per injury									100,000,000
Prepayment for 2026 Locomotive Maintenance Services
Other Commitments [Line Items]
Cost, maintenance									96,000,000
Payment for Pre-owned Locomotives
Other Commitments [Line Items]
Cost, maintenance									$ 14,000,000