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Related Party Transactions (Narrative) (Details) (Corporate Joint Venture [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 26, 2014 | Dec. 27, 2013 | Dec. 28, 2012
Related Party Transaction [Line Items] |  |  |  |
Difference between carrying amount and underlying equity | $ 355 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity |  |  |
Interest expense | 3 us-gaap_InterestExpenseRelatedParty |  | 4 us-gaap_InterestExpenseRelatedParty | 4 us-gaap_InterestExpenseRelatedParty
Economic interest in related party which is also an equity method investment [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage economic interest in related party | 42.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / csx_EconomicinterestAxis = csx_EconomicinterestinrelatedpartywhichisalsoanequitymethodinvestmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |  |  |
Voting interest in related party which is also an equity method investment [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage economic interest in related party | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember / csx_VotinginterestAxis = csx_VotinginterestinrelatedpartywhichisalsoanequitymethodinvestmentMember |  |  |
Long-term Debt [Member] | CSXT Promissory Note Related Party October 2044 [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Promissory Notes Payable to Conrail Subsidiary | 151 us-gaap_NotesPayableRelatedPartiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_CSXTPromissoryNoteRelatedPartyOctober2044Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember | [1] |  |
Notes issued, interest rate | 2.89%us-gaap_RelatedPartyTransactionRate / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_CSXTPromissoryNoteRelatedPartyOctober2044Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember | [1] |  |
Long-term Debt [Member] | CSXT Promissory Note Related Party March 2035 [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Promissory Notes Payable to Conrail Subsidiary |  |  | 23 us-gaap_NotesPayableRelatedPartiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_CSXTPromissoryNoteRelatedPartyMarch2035Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |
Notes issued, interest rate | 4.52%us-gaap_RelatedPartyTransactionRate / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_CSXTPromissoryNoteRelatedPartyMarch2035Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |  | 4.52%us-gaap_RelatedPartyTransactionRate / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_CSXTPromissoryNoteRelatedPartyMarch2035Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |
Long-term Debt [Member] | CSX Promissory Note Related Party October 2035 [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Promissory Notes Payable to Conrail Subsidiary |  |  | $ 73 us-gaap_NotesPayableRelatedPartiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_CSXPromissoryNoteRelatedPartyOctober2035Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |
Notes issued, interest rate | 4.40%us-gaap_RelatedPartyTransactionRate / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_CSXPromissoryNoteRelatedPartyOctober2035Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |  | 4.40%us-gaap_RelatedPartyTransactionRate / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_CSXPromissoryNoteRelatedPartyOctober2035Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |
[1] | Promissory notes payable to Conrail are included on the consolidated balance sheet of CSX as long-term debt.

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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