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Document And Entity Information
6 Months Ended
Jun. 27, 2014
Document and Entity Information [Abstract]  
Entity Registrant Name CSX CORP
Entity Central Index Key 0000277948
Current Fiscal Year End Date --12-26
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 999,572,416
Document Fiscal Year Focus 2014
Document Fiscal Period Focus Q2
Document Type 10-Q
Amendment Flag false
Document Period End Date Jun. 27, 2014