Commitments and Contingencies (Details)	1 Months Ended		6 Months Ended
	Apr. 30, 2014 mi	May. 31, 2007 entity	Jun. 26, 2015 USD ($) party mi
Commitments and Contingencies Disclosure [Abstract]
Non-catastrophic property deductible per occurrence			$ 25,000,000
Casualty and catastrophic property deductible per occurrence			$ 50,000,000
Environmental
Loss Contingencies [Line Items]
Number of miles subject to remediation | mi	8		17
Number of parties involved in remediation | party			60
Pending Litigation
Loss Contingencies [Line Items]
Range of possible loss for certain legal proceedings, minimum			$ 3,000,000
Range of possible loss for certain legal proceedings, maximum			$ 49,000,000
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