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Related Party Transactions (Consolidated Balance Sheets Components) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 26, 2014 | Dec. 27, 2013
Related Party Transaction [Line Items] |  |  |
CSX Payable to Conrail | $ 0 us-gaap_DueToAffiliateCurrent |  | $ 0 us-gaap_DueToAffiliateCurrent
CSXT Promissory Note Related Party October 2044 [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Due to Related Parties, Current | 3 us-gaap_DueToRelatedPartiesCurrent / us-gaap_DebtInstrumentAxis = csx_CSXTPromissoryNoteRelatedPartyOctober2044Member |  |
Corporate Joint Venture [Member] | Accounts Payable [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
CSX Payable to Conrail | 54 us-gaap_DueToAffiliateCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |  | 172 us-gaap_DueToAffiliateCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember
Corporate Joint Venture [Member] | Accounts Payable [Member] | Related Party Accounts Payable Converted to a Note [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
CSX Payable to Conrail | 125 us-gaap_DueToAffiliateCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableMember / us-gaap_DebtInstrumentAxis = csx_RelatedPartyAccountsPayableConvertedtoaNoteMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |  |
Corporate Joint Venture [Member] | Long-term Debt [Member] | CSX Promissory Note Related Party October 2044 [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_CSXPromissoryNoteRelatedPartyOctober2044Member / 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_CSXPromissoryNoteRelatedPartyOctober2044Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember | [1] |
Corporate Joint Venture [Member] | 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
Corporate Joint Venture [Member] | Long-term Debt [Member] | Total Related Party Promissory Notes, October 2044 [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Promissory Notes Payable to Conrail Subsidiary | 224 us-gaap_NotesPayableRelatedPartiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_LongTermDebtMember / us-gaap_DebtInstrumentAxis = csx_TotalRelatedPartyPromissoryNotesOctober2044Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CorporateJointVentureMember |  |
Corporate Joint Venture [Member] | 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] |
Corporate Joint Venture [Member] | 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
[1] | Promissory notes payable to Conrail are included on the consolidated balance sheet of CSX as long-term debt.

X
- Definition Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 12 -Subparagraph 3 -Article 6 + Details
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