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Nature of Operations and Significant Accounting Policies (Business) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2014 states mi railroads employees | Sep. 26, 2014 | Jun. 27, 2014 | Mar. 28, 2014 | Dec. 27, 2013 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 29, 2013 | Dec. 26, 2014 employees states mi railroads | Dec. 27, 2013 | Dec. 28, 2012
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Entity Number of Employees | 32,000 dei_EntityNumberOfEmployees |  |  |  |  |  |  |  | 32,000 dei_EntityNumberOfEmployees |  |
Number of Union Employees |  |  |  |  |  |  |  |  | 26,000 csx_NumberOfUnionEmployees |  |
Total number of rail route miles | 21,000 csx_RailRouteNetworkDistance |  |  |  |  |  |  |  | 21,000 csx_RailRouteNetworkDistance |  |
Rail network states number | 23 us-gaap_NumberOfStatesInWhichEntityOperates |  |  |  |  |  |  |  | 23 us-gaap_NumberOfStatesInWhichEntityOperates |  |
Number of short-line and regional railroads served | 240 csx_NumberOfShortLineAndRegionalRailroadsServed |  |  |  |  |  |  |  | 240 csx_NumberOfShortLineAndRegionalRailroadsServed |  |
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
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of ocean, river and lake ports serviced (more than 70) | 70 csx_NumberOfOceanRiverAndLakePortsServiced / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  | 70 csx_NumberOfOceanRiverAndLakePortsServiced / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Merchandise business [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of carloads |  |  |  |  |  |  |  |  | 2,900,000 csx_NumberOfCarloads / us-gaap_ProductOrServiceAxis = csx_MerchandiseBusinessMember |  |
Percentage of total revenue |  |  |  |  |  |  |  |  | 60.00%csx_PercentageOfTotalRevenue / us-gaap_ProductOrServiceAxis = csx_MerchandiseBusinessMember |  |
Percentage of total volume |  |  |  |  |  |  |  |  | 42.00%csx_PercentageOfTotalVolume / us-gaap_ProductOrServiceAxis = csx_MerchandiseBusinessMember |  |
Coal business [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of carloads |  |  |  |  |  |  |  |  | 1,300,000 csx_NumberOfCarloads / us-gaap_ProductOrServiceAxis = csx_CoalBusinessMember |  |
Percentage of total revenue |  |  |  |  |  |  |  |  | 22.00%csx_PercentageOfTotalRevenue / us-gaap_ProductOrServiceAxis = csx_CoalBusinessMember |  |
Percentage of total volume |  |  |  |  |  |  |  |  | 18.00%csx_PercentageOfTotalVolume / us-gaap_ProductOrServiceAxis = csx_CoalBusinessMember |  |
Intermodal business [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenue |  |  |  |  |  |  |  |  | 14.00%csx_PercentageOfTotalRevenue / us-gaap_ProductOrServiceAxis = csx_IntermodalBusinessMember |  |
Percentage of total volume |  |  |  |  |  |  |  |  | 40.00%csx_PercentageOfTotalVolume / us-gaap_ProductOrServiceAxis = csx_IntermodalBusinessMember |  |
Number of terminals (more than 50) | 50 csx_MinimumNumberOfTerminals / us-gaap_ProductOrServiceAxis = csx_IntermodalBusinessMember |  |  |  |  |  |  |  | 50 csx_MinimumNumberOfTerminals / us-gaap_ProductOrServiceAxis = csx_IntermodalBusinessMember |  |
Other business [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenue |  |  |  |  |  |  |  |  | 4.00%csx_PercentageOfTotalRevenue / us-gaap_ProductOrServiceAxis = csx_OtherBusinessMember |  |

X
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