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