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Debt and Credit Agreements - Narrative (Details) (USD $)
3 Months Ended
Mar. 27, 2015
Credit Facility  
Line of Credit Facility  
Borrowing capacity $ 1,000,000,000.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Facility expiration date Sep. 30, 2016
Amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Receivables Securitization Facility  
Line of Credit Facility  
Borrowing capacity 250,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= csx_AccountsReceivableSecuritizationCreditFacilityMember
Facility expiration period 3 years
Facility expiration date Jun. 20, 2017
Amount outstanding $ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= csx_AccountsReceivableSecuritizationCreditFacilityMember