Commitments and Contingencies (Details)	1 Months Ended		3 Months Ended
	Mar. 31, 2016 defendant mi	May 31, 2007 entity	Mar. 31, 2018 USD ($) claim mi
Loss Contingencies [Line Items]
Casualty and non catastrophic property deductible			$ 25,000,000
Casualty and catastrophic property deductible			$ 50,000,000
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
Pending Litigation | Minimum
Loss Contingencies [Line Items]
Possible loss for certain legal proceedings			$ 2,000,000
Pending Litigation | Maximum
Loss Contingencies [Line Items]
Possible loss for certain legal proceedings			$ 115,000,000
Settled Litigation | Environmental
Loss Contingencies [Line Items]
Number of miles subject to remediation | mi	8
Number of parties | defendant	80