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Commitments and Contingencies (Details)
1 Months Ended 9 Months Ended
Jun. 30, 2018
defendant
Mar. 31, 2016
party
mi
May 31, 2007
claim
entity
Sep. 30, 2020
USD ($)
mi
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loss Contingencies [Line Items]            
Casualty and catastrophic property deductible         $ 100,000,000 $ 50,000,000
Casualty and non catastrophic property deductible         $ 75,000,000 $ 25,000,000
Fuel Surcharge Antitrust Litigation            
Loss Contingencies [Line Items]            
Number of consolidated class action lawsuits | claim     1      
Environmental            
Loss Contingencies [Line Items]            
Number of miles pertaining to Passaic River tidal reach required to be studied by EPA | mi       17    
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      
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       41,000,000    
Settled Litigation | Environmental            
Loss Contingencies [Line Items]            
Number of miles subject to remediation | mi   8        
Total Casualty            
Loss Contingencies [Line Items]            
Self-insured retention amount, per occurrence (up to)       $ 75,000,000