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Properties (Detail of Net Properties) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 26, 2014 | Dec. 27, 2013
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 39,343 us-gaap_PropertyPlantAndEquipmentGross | $ 37,184 us-gaap_PropertyPlantAndEquipmentGross
Accumulated Depreciation | (10,759)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (9,893)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Properties - Net | 28,584 us-gaap_PropertyPlantAndEquipmentNet | 27,291 us-gaap_PropertyPlantAndEquipmentNet
Road - Total [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 26,125 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTotalMember | 24,618 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTotalMember
Accumulated Depreciation | (6,148)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTotalMember | (5,592)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTotalMember
Properties - Net | 19,977 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTotalMember | 19,026 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTotalMember
Road - Rail and Other Track Material [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 6,771 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadRailAndOtherTrackMaterialMember | 6,452 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadRailAndOtherTrackMaterialMember
Accumulated Depreciation | (1,400)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadRailAndOtherTrackMaterialMember | (1,270)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadRailAndOtherTrackMaterialMember
Properties - Net | 5,371 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadRailAndOtherTrackMaterialMember | 5,182 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadRailAndOtherTrackMaterialMember
Annual Depreciation Rate | 2.50%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadRailAndOtherTrackMaterialMember | 2.90%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadRailAndOtherTrackMaterialMember
Depreciation Method | Group Life | Group Life
Road - Ties [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 4,807 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember | 4,534 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember
Accumulated Depreciation | (1,060)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember | (947)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember
Properties - Net | 3,747 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember | 3,587 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember
Annual Depreciation Rate | 3.70%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember | 4.00%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember
Depreciation Method | Group Life | Group Life
Road - Grading [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 2,460 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember | 2,425 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember
Accumulated Depreciation | (481)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember | (448)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember
Properties - Net | 1,979 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember | 1,977 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember
Annual Depreciation Rate | 1.40%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember | 1.50%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember
Depreciation Method | Group Life | Group Life
Road - Ballast [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 2,693 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBallastMember | 2,612 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBallastMember
Accumulated Depreciation | (679)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBallastMember | (645)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBallastMember
Properties - Net | 2,014 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBallastMember | 1,967 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBallastMember
Annual Depreciation Rate | 2.70%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBallastMember | 2.80%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBallastMember
Depreciation Method | Group Life | Group Life
Road - Bridges, Trestles, and Culverts [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 2,119 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBridgesTrestlesAndCulvertsMember | 2,008 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBridgesTrestlesAndCulvertsMember
Accumulated Depreciation | (278)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBridgesTrestlesAndCulvertsMember | (250)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBridgesTrestlesAndCulvertsMember
Properties - Net | 1,841 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBridgesTrestlesAndCulvertsMember | 1,758 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBridgesTrestlesAndCulvertsMember
Annual Depreciation Rate | 1.60%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBridgesTrestlesAndCulvertsMember | 1.60%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBridgesTrestlesAndCulvertsMember
Depreciation Method | Group Life | Group Life
Road - Signals and Interlockers [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 2,103 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadSignalsAndInterlockersMember | 1,922 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadSignalsAndInterlockersMember
Accumulated Depreciation | (356)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadSignalsAndInterlockersMember | (291)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadSignalsAndInterlockersMember
Properties - Net | 1,747 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadSignalsAndInterlockersMember | 1,631 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadSignalsAndInterlockersMember
Annual Depreciation Rate | 4.00%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadSignalsAndInterlockersMember | 3.40%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadSignalsAndInterlockersMember
Depreciation Method | Group Life | Group Life
Road - Buildings [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 1,102 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBuildingsMember | 1,011 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBuildingsMember
Accumulated Depreciation | (377)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBuildingsMember | (355)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBuildingsMember
Properties - Net | 725 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBuildingsMember | 656 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBuildingsMember
Annual Depreciation Rate | 2.50%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBuildingsMember | 2.50%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadBuildingsMember
Depreciation Method | Group Life | Group Life
Road - Other [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 4,070 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember | 3,654 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember
Accumulated Depreciation | (1,517)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember | (1,386)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember
Properties - Net | 2,553 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember | 2,268 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember
Annual Depreciation Rate | 4.20%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember | 4.70%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember
Depreciation Method | Group Life | Group Life
Total Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 10,108 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_TotalEquipmentMember | 9,764 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_TotalEquipmentMember
Accumulated Depreciation | (4,526)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_TotalEquipmentMember | (4,225)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_TotalEquipmentMember
Properties - Net | 5,582 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_TotalEquipmentMember | 5,539 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_TotalEquipmentMember
Equipment - Locomotive [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 5,036 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentLocomotiveMember | 4,987 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentLocomotiveMember
Accumulated Depreciation | (2,325)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentLocomotiveMember | (2,176)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentLocomotiveMember
Properties - Net | 2,711 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentLocomotiveMember | 2,811 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentLocomotiveMember
Annual Depreciation Rate | 3.60%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentLocomotiveMember | 3.60%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentLocomotiveMember
Depreciation Method | Group Life | Group Life
Equipment - Freight Cars [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 3,244 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentFreightCarsMember | 3,111 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentFreightCarsMember
Accumulated Depreciation | (1,169)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentFreightCarsMember | (1,135)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentFreightCarsMember
Properties - Net | 2,075 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentFreightCarsMember | 1,976 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentFreightCarsMember
Annual Depreciation Rate | 3.20%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentFreightCarsMember | 3.10%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentFreightCarsMember
Depreciation Method | Group Life | Group Life
Equipment - Work Equipment and Other [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 1,828 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember | 1,666 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember
Accumulated Depreciation | (1,032)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember | (914)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember
Properties - Net | 796 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember | 752 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember
Annual Depreciation Rate | 7.10%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember | 7.10%csx_AnnualDepreciationRate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember
Depreciation Method | Group Life | Group Life
Land [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 1,875 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 1,842 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Properties - Net | 1,875 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 1,842 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Construction in Progress [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 1,196 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | 854 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember
Properties - Net | 1,196 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | 854 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember
Other properties [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 39 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_OtherPropertiesMember | 106 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_OtherPropertiesMember
Accumulated Depreciation | (85)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_OtherPropertiesMember | (76)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_OtherPropertiesMember
Properties - Net | $ (46)us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_OtherPropertiesMember | $ 30 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_OtherPropertiesMember
Depreciation Method | Straight Line | Straight Line
Minimum [Member] | Road - Total [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 8 years | 6 years
Minimum [Member] | Road - Other [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 8 years |
Minimum [Member] | Total Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 3 years | 5 years
Minimum [Member] | Other properties [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 4 years | 4 years
Maximum [Member] | Road - Total [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 90 years | 80 years
Maximum [Member] | Road - Grading [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 90 years |
Maximum [Member] | Total Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 38 years | 38 years
Maximum [Member] | Equipment - Work Equipment and Other [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 38 years |
Maximum [Member] | Other properties [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 30 years | 30 years

X
- Definition The composite annual depreciation rate used to depreciate rail assets, including main-line track, locomotives and freight cars using the group-life method of accounting. All other depreciable assets are depreciated on a straight-line basis. The group-life method aggregates assets with similar lives and characteristics into groups and depreciates each of these groups as a whole. When using the group-life method, an underlying assumption is that each group of assets, as a whole, is used and depreciated to the end of its recoverable life. + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Description of the methodology for computing depreciation for classes of depreciable assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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