Commitments and Contingencies (Details)			1 Months Ended			3 Months Ended
	Jun. 01, 2021 USD ($)	May 31, 2021 USD ($)	Jun. 30, 2018 defendant	Mar. 31, 2016 party mi	May 31, 2007 entity claim	Mar. 31, 2022 USD ($) mi	Mar. 31, 2021 USD ($)
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 parties participating in allocation process under study | party				80
Number of parties | defendant			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						$ 2,000,000
Maximum | Pending Litigation
Loss Contingencies [Line Items]
Possible loss for certain legal proceedings						22,000,000
Total Casualty
Loss Contingencies [Line Items]
Self-insured retention amount, per occurrence (up to)	$ 100,000,000	$ 75,000,000				$ 100,000,000