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Commitments and Contingencies (Details) (USD $)
1 Months Ended 3 Months Ended 1 Months Ended
Apr. 30, 2014
mi
Mar. 27, 2015
mi
party
May 31, 2007
entity
Commitments and Contingencies Disclosure [Abstract]      
Non-catastrophic property deductible per occurrence   25,000,000csx_CasualtyAndNonCatastrophicPropertyDeductible  
Casualty and catastrophic property deductible per occurrence   50,000,000csx_CasualtyAndCatastrophicPropertyDeductible  
Environmental      
Loss Contingencies [Line Items]      
Number of miles subject to remediation 8csx_SiteContingencyNumberofMilesUnderStudy
/ us-gaap_LitigationCaseAxis
= csx_EnvironmentalLitigationMember
17csx_SiteContingencyNumberofMilesUnderStudy
/ us-gaap_LitigationCaseAxis
= csx_EnvironmentalLitigationMember
 
Number of parties involved in remediation   60csx_SiteContingencyNumberofPartiesInvolvedinRemediation
/ us-gaap_LitigationCaseAxis
= csx_EnvironmentalLitigationMember
 
Pending Litigation      
Loss Contingencies [Line Items]      
Range of possible loss for certain legal proceedings, minimum   3,000,000us-gaap_LossContingencyRangeOfPossibleLossMinimum
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
 
Range of possible loss for certain legal proceedings, maximum   46,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
 
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)     3csx_LossContingencyClaimsFiledNumberOfEntities
/ us-gaap_LitigationCaseAxis
= csx_FuelSurchargeAntitrustLitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember