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Related Party Transactions (Consolidated Income Statements Components) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Dec. 28, 2012
Related Party Amounts Consolidated Income Statements [Abstract]      
Equity earnings of Conrail $ 0us-gaap_IncomeLossFromEquityMethodInvestments $ 0us-gaap_IncomeLossFromEquityMethodInvestments $ 0us-gaap_IncomeLossFromEquityMethodInvestments
Corporate Joint Venture [Member] | Materials, Supplies and Other [Member]      
Related Party Amounts Consolidated Income Statements [Abstract]      
Rents, Fees and Services 124us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
115us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
139us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
Purchase Price Amortization and Other 4csx_PurchasePriceAmortizationAndOther
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
4csx_PurchasePriceAmortizationAndOther
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
4csx_PurchasePriceAmortizationAndOther
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
Equity earnings of Conrail (31)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
(35)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
(26)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
Total Conrail Rents, Fees and Services $ 97csx_TotalRelatedPartyRentsFeesAndServices
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
$ 84csx_TotalRelatedPartyRentsFeesAndServices
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
$ 117csx_TotalRelatedPartyRentsFeesAndServices
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember