Commitments and Contingencies (Details)	1 Months Ended			2 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2016 defendant mi	May 31, 2007 entity	May 31, 2018 USD ($)	Jun. 30, 2018 USD ($) claim mi
Loss Contingencies [Line Items]
Casualty and catastrophic property deductible	$ 50,000,000				$ 50,000,000
Casualty and non catastrophic property deductible	25,000,000				$ 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
Pending Litigation | Minimum
Loss Contingencies [Line Items]
Possible loss for certain legal proceedings	2,000,000				$ 2,000,000
Pending Litigation | Maximum
Loss Contingencies [Line Items]
Possible loss for certain legal proceedings	117,000,000				$ 117,000,000
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