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Commitments and Contingencies (Environmental Matters) (Details) (Environmental Litigation [Member]) | 12 Months Ended
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Dec. 26, 2014 counterparty mi
Environmental Litigation [Member] |
Loss Contingencies [Line Items] |
Number of miles pertaining to Passaic River tidal reach required to be studied by EPA | 17 csx_NumberofmilespertainingtoPassaicRivertidalreachrequiredtobestudiedbyEPA / us-gaap_LitigationCaseAxis = csx_EnvironmentalLitigationMember
Number Of Potentially Responsible Parties In Connection With Environmental Liabilities For Operations Conducted Near Passaic River | 60 csx_NumberOfPotentiallyResponsiblePartiesInConnectionWithEnvironmentalLiabilitiesForOperationsConductedNearPassaicRiver / us-gaap_LitigationCaseAxis = csx_EnvironmentalLitigationMember

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- Definition Number of miles on the Passaic River tidal reach required to be studied as determined by the US Environmental Protection Agency. + References No definition available. + Details
Name: | csx_NumberofmilespertainingtoPassaicRivertidalreachrequiredtobestudiedbyEPA
Namespace Prefix: | csx_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Potentially Responsible Parties In Connection With Environmental Liabilities For Operations Conducted Near Passaic River + References No definition available. + Details
Name: | csx_NumberOfPotentiallyResponsiblePartiesInConnectionWithEnvironmentalLiabilitiesForOperationsConductedNearPassaicRiver
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration