Commitments and Contingencies (Details)				1 Months Ended			6 Months Ended
	Mar. 24, 2023 defendant	Mar. 02, 2023 mi	Jun. 01, 2021 USD ($)	Jun. 30, 2018 defendant	Mar. 31, 2016 party mi	May 31, 2007 claim entity	Jun. 30, 2023 USD ($) mi	Mar. 02, 2022 party
Loss Contingencies [Line Items]
Casualty and catastrophic property deductible							$ 100,000,000
Casualty and non catastrophic property deductible							$ 75,000,000
Environmental
Loss Contingencies [Line Items]
Number of miles subject to remediation | mi					8
Number of upper miles under study | mi		9
Number of parties participating in allocation process under study | party					80
Number of parties liable | party								8
Number of parties | defendant	37			110
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
Number of consolidated class action lawsuits | claim						1
Pending Litigation | Environmental
Loss Contingencies [Line Items]
Number of miles pertaining to Passaic River tidal reach required to be studied by EPA | mi							17
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							23,000,000
Total Casualty
Loss Contingencies [Line Items]
Self-insured retention amount, per occurrence (up to)			$ 100,000,000				$ 100,000,000