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Summarized Consolidating Financial Data (Income Statements) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 26, 2014 | Sep. 26, 2014 | Jun. 27, 2014 | Mar. 28, 2014 | Dec. 27, 2013 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 29, 2013 | Dec. 26, 2014 | Dec. 27, 2013 | Dec. 28, 2012
Consolidated Income Statement |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,192 us-gaap_SalesRevenueNet | $ 3,221 us-gaap_SalesRevenueNet | $ 3,244 us-gaap_SalesRevenueNet | $ 3,012 us-gaap_SalesRevenueNet | $ 3,032 us-gaap_SalesRevenueNet | $ 2,985 us-gaap_SalesRevenueNet | $ 3,046 us-gaap_SalesRevenueNet | $ 2,963 us-gaap_SalesRevenueNet | $ 12,669 us-gaap_SalesRevenueNet | $ 12,026 us-gaap_SalesRevenueNet | $ 11,763 us-gaap_SalesRevenueNet
Operating Expenses |  |  |  |  |  |  |  |  | 9,056 us-gaap_CostsAndExpenses | 8,553 us-gaap_CostsAndExpenses | 8,299 us-gaap_CostsAndExpenses
Operating Income | 901 us-gaap_OperatingIncomeLoss | 976 us-gaap_OperatingIncomeLoss | 997 us-gaap_OperatingIncomeLoss | 739 us-gaap_OperatingIncomeLoss | 813 us-gaap_OperatingIncomeLoss | 840 us-gaap_OperatingIncomeLoss | 940 us-gaap_OperatingIncomeLoss | 880 us-gaap_OperatingIncomeLoss | 3,613 us-gaap_OperatingIncomeLoss | 3,473 us-gaap_OperatingIncomeLoss | 3,464 us-gaap_OperatingIncomeLoss
Equity in Earnings of Subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments | 0 us-gaap_IncomeLossFromEquityMethodInvestments | 0 us-gaap_IncomeLossFromEquityMethodInvestments
Interest Expense |  |  |  |  |  |  |  |  | (545)us-gaap_InterestExpense | (562)us-gaap_InterestExpense | (566)us-gaap_InterestExpense
Other Income - Net |  |  |  |  |  |  |  |  | (24)us-gaap_OtherNonoperatingIncomeExpense | 11 us-gaap_OtherNonoperatingIncomeExpense | 73 us-gaap_OtherNonoperatingIncomeExpense
Earnings Before Income Taxes |  |  |  |  |  |  |  |  | 3,044 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 2,922 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 2,971 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (1,117)us-gaap_IncomeTaxExpenseBenefit | (1,058)us-gaap_IncomeTaxExpenseBenefit | (1,108)us-gaap_IncomeTaxExpenseBenefit
Net Earnings | 491 us-gaap_NetIncomeLoss | 509 us-gaap_NetIncomeLoss | 529 us-gaap_NetIncomeLoss | 398 us-gaap_NetIncomeLoss | 426 us-gaap_NetIncomeLoss | 455 us-gaap_NetIncomeLoss | 521 us-gaap_NetIncomeLoss | 462 us-gaap_NetIncomeLoss | 1,927 us-gaap_NetIncomeLoss | 1,864 us-gaap_NetIncomeLoss | 1,863 us-gaap_NetIncomeLoss
Comprehensive Earnings |  |  |  |  |  |  |  |  | 1,784 us-gaap_ComprehensiveIncomeNetOfTax | 2,277 us-gaap_ComprehensiveIncomeNetOfTax | 1,802 us-gaap_ComprehensiveIncomeNetOfTax
CSX Corporation |  |  |  |  |  |  |  |  |  |  |
Consolidated Income Statement |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Expenses |  |  |  |  |  |  |  |  | (427)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (371)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (355)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Income |  |  |  |  |  |  |  |  | 427 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 371 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 355 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in Earnings of Subsidiaries |  |  |  |  |  |  |  |  | 1,996 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,964 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,992 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest Expense |  |  |  |  |  |  |  |  | (520)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (516)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (513)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  | (3)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Income - Net |  |  |  |  |  |  |  |  | (19)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Earnings Before Income Taxes |  |  |  |  |  |  |  |  | 1,884 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,812 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,831 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 43 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 52 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 32 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Earnings |  |  |  |  |  |  |  |  | 1,927 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,864 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,863 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive Earnings |  |  |  |  |  |  |  |  | 1,784 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,277 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,802 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CSX Transportation |  |  |  |  |  |  |  |  |  |  |
Consolidated Income Statement |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 12,590 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 11,950 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 11,696 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Operating Expenses |  |  |  |  |  |  |  |  | 9,585 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 9,091 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 8,779 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Operating Income |  |  |  |  |  |  |  |  | 3,005 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,859 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,917 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Equity in Earnings of Subsidiaries |  |  |  |  |  |  |  |  | 1 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (1)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (2)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Interest Expense |  |  |  |  |  |  |  |  | (46)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (62)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (70)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  | 61 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other Income - Net |  |  |  |  |  |  |  |  | (4)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (2)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Earnings Before Income Taxes |  |  |  |  |  |  |  |  | 2,956 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,794 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,906 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (1,093)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (1,028)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (1,065)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net Earnings |  |  |  |  |  |  |  |  | 1,863 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,766 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,841 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Comprehensive Earnings |  |  |  |  |  |  |  |  | 1,875 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,825 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,818 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Eliminations and Other |  |  |  |  |  |  |  |  |  |  |
Consolidated Income Statement |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 79 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | 76 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | 67 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Operating Expenses |  |  |  |  |  |  |  |  | (102)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (167)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (125)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Operating Income |  |  |  |  |  |  |  |  | 181 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | 243 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | 192 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Equity in Earnings of Subsidiaries |  |  |  |  |  |  |  |  | (1,997)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (1,963)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (1,990)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Interest Expense |  |  |  |  |  |  |  |  | 21 us-gaap_InterestExpense / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | 16 us-gaap_InterestExpense / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | 17 us-gaap_InterestExpense / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  | 15 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Other Income - Net |  |  |  |  |  |  |  |  | (1)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | 20 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember |
Earnings Before Income Taxes |  |  |  |  |  |  |  |  | (1,796)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (1,684)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (1,766)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (67)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (82)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (75)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Net Earnings |  |  |  |  |  |  |  |  | (1,863)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (1,766)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | (1,841)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember
Comprehensive Earnings |  |  |  |  |  |  |  |  | $ (1,875)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | $ (1,825)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember | $ (1,818)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = csx_ConsolidationEliminationsAndOtherEntitiesMember

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