Commitments and Contingencies - Narrative (Details)				1 Months Ended			12 Months Ended
	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