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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) $ 9,742csx_TotalLongtermDebt $ 9,555csx_TotalLongtermDebt
Less Debt Due within One Year (228)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (533)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term Debt (excluding current portion) 9,514us-gaap_LongTermDebtAndCapitalLeaseObligations 9,022us-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) 9,456csx_TotalLongtermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 8,935csx_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) 277csx_TotalLongtermDebt
/ us-gaap_LongtermDebtTypeAxis
= csx_EquipmentObligationsMember		 [1] 602csx_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) 8csx_TotalLongtermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember		 16csx_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) $ 1csx_TotalLongtermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 $ 2csx_TotalLongtermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
[1] These obligations are secured by an interest in certain railroad equipment.