Commitments and Contingencies (Details)						1 Months Ended		3 Months Ended
	Jan. 31, 2024 USD ($) party	Mar. 24, 2023 defendant	Mar. 02, 2023 mi	Jun. 01, 2021 USD ($)	Jun. 30, 2018 defendant	Mar. 31, 2016 mi	May 31, 2007 entity	Mar. 31, 2024 USD ($) mi	Mar. 02, 2022 party
Loss Contingencies [Line Items]
Casualty and catastrophic property deductible								$ 150,000,000
Casualty and non catastrophic property deductible								$ 125,000,000
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
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	$ 150,000,000
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								$ 3,000,000
Maximum | Pending Litigation
Loss Contingencies [Line Items]
Possible loss for certain legal proceedings								54,000,000
Total Casualty
Loss Contingencies [Line Items]
Self-insured retention amount, per occurrence (up to)				$ 100,000,000				$ 100,000,000