XML 32 R86.htm IDEA: XBRL DOCUMENT v2.4.1.9
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 $ 0us-gaap_DueToAffiliateCurrent $ 0us-gaap_DueToAffiliateCurrent
CSXT Promissory Note Related Party October 2044 [Member]    
Related Party Transaction [Line Items]    
Due to Related Parties, Current 3us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_DebtInstrumentAxis
= csx_CSXTPromissoryNoteRelatedPartyOctober2044Member		  
Corporate Joint Venture [Member] | Accounts Payable [Member]    
Related Party Transaction [Line Items]    
CSX Payable to Conrail 54us-gaap_DueToAffiliateCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember		 172us-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 125us-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 73us-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   73us-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 224us-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 151us-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   $ 23us-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.