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Debt and Credit Agreements (Long-term Debt Instruments) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 26, 2014 | Dec. 27, 2013
Debt Instrument [Line Items] |  |  |  |
Total Long-term Debt Maturities (including current portion) | $ 9,742 csx_TotalLongtermDebt |  | $ 9,555 csx_TotalLongtermDebt |
Less Debt Due within One Year | (228)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |  | (533)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |
Long-term Debt (excluding current portion) | 9,514 us-gaap_LongTermDebtAndCapitalLeaseObligations |  | 9,022 us-gaap_LongTermDebtAndCapitalLeaseObligations |
Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average Interest Rates (in hundredths) | 5.50%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |
Total Long-term Debt Maturities (including current portion) | 9,456 csx_TotalLongtermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  | 8,935 csx_TotalLongtermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |
Equipment Obligations [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average Interest Rates (in hundredths) | 6.30%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = csx_EquipmentObligationsMember | [1] |  |
Total Long-term Debt Maturities (including current portion) | 277 csx_TotalLongtermDebt / us-gaap_LongtermDebtTypeAxis = csx_EquipmentObligationsMember | [1] | 602 csx_TotalLongtermDebt / us-gaap_LongtermDebtTypeAxis = csx_EquipmentObligationsMember | [1]
Capital Leases [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average Interest Rates (in hundredths) | 13.50%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |
Total Long-term Debt Maturities (including current portion) | 8 csx_TotalLongtermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  | 16 csx_TotalLongtermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Convertible Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average Interest Rates (in hundredths) | 1.00%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Total Long-term Debt Maturities (including current portion) | $ 1 csx_TotalLongtermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  | $ 2 csx_TotalLongtermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
[1] | These obligations are secured by an interest in certain railroad equipment.

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans, and capital lease obligations. + References No definition available. + Details
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Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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- Details
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