Commitments and Contingencies (Details)			1 Months Ended		9 Months Ended
	Jun. 01, 2018 USD ($)	May 31, 2018 USD ($)	Mar. 31, 2016 defendant mi	May 31, 2007 entity	Sep. 30, 2019 USD ($) claim plaintiff mi
Loss Contingencies [Line Items]
Casualty and catastrophic property deductible					$ 50,000,000
Casualty and non catastrophic property deductible					$ 25,000,000
Environmental
Loss Contingencies [Line Items]
Number of miles pertaining to Passaic River tidal reach required to be studied by EPA | mi					17
Pending Litigation
Loss Contingencies [Line Items]
Claims with potential material impact (number of claims) | claim					1
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 named plaintiffs | plaintiff					8
Pending Litigation | Minimum
Loss Contingencies [Line Items]
Possible loss for certain legal proceedings					$ 1,000,000
Pending Litigation | Maximum
Loss Contingencies [Line Items]
Possible loss for certain legal proceedings					$ 28,000,000
Settled Litigation | Environmental
Loss Contingencies [Line Items]
Number of miles subject to remediation | mi			8
Number of parties | defendant			80
Total Casualty
Loss Contingencies [Line Items]
Self-insured retention amount, per occurrence	$ 75,000,000	$ 50,000,000