XML 30 R57.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Properties (Railroad Assets, Non-Railroad Assets, and Capital Expenditure) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 26, 2014 | Dec. 27, 2013 | Dec. 28, 2012
Railroad Assets [Abstract] |  |  |
Percentage of assets depreciated under the group-life method | 85.00%csx_PercentageOfAssetsDepreciatedUnderGroupLifeMethod |  |
Total fixed assets | $ 39,343 us-gaap_PropertyPlantAndEquipmentGross | $ 37,184 us-gaap_PropertyPlantAndEquipmentGross |
Annual depreciation expense | 1,151 us-gaap_Depreciation | 1,104 us-gaap_Depreciation | 1,059 us-gaap_Depreciation
Capital Expenditures [Abstract] |  |  |
Percentage of labor costs relating to the deconstruction of old track (In hundredths) | 20.00%csx_PercentageOfLaborCostRailInstallationDeconstructionOfOldTrack |  |
Percentage of labor costs relating to the installation of new track (In hundredths) | 80.00%csx_PercentageOfLaborCostRailInstallationInstallationOfNewTrack |  |
Road - Total [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | 26,125 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTotalMember | 24,618 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTotalMember |
Life studies, frequency period | 6 years |  |
Road - Ties [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | 4,807 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember | 4,534 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember |
Number of depreciable asset categories for railroad assets | 18 csx_NumberOfDepreciableAssetCategoriesForRailroadAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadTiesMember |  |
Road - System Roadway Machinery [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | 4,070 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember | 3,654 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadOtherMember |
Road - Grading [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | 2,460 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember | 2,425 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_RoadGradingMember |
Total Equipment [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | 10,108 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_TotalEquipmentMember | 9,764 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_TotalEquipmentMember |
Life studies, frequency period | 3 years |  |
Equipment - Work Equipment and Other [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | 1,828 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember | 1,666 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_EquipmentWorkEquipmentAndOtherMember |
Abnormal gain (loss) on operating property [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Abnormal gains and losses | 0 us-gaap_GainLossOnDispositionOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_AbnormalgainlossonoperatingpropertyMember | 65 us-gaap_GainLossOnDispositionOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_AbnormalgainlossonoperatingpropertyMember | 104 us-gaap_GainLossOnDispositionOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_AbnormalgainlossonoperatingpropertyMember
Gain (loss) on non-operating property [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Abnormal gains and losses |  | 57 us-gaap_GainLossOnDispositionOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = csx_GainlossonnonoperatingpropertyMember |
Minimum [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Number of depreciable asset categories for railroad assets | 130 csx_NumberOfDepreciableAssetCategoriesForRailroadAssets / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Road - Total [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 8 years | 6 years |
Minimum [Member] | Road - System Roadway Machinery [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 8 years |  |
Minimum [Member] | Total Equipment [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 3 years | 5 years |
Minimum [Member] | Technology Assets [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 3 years |  |
Maximum [Member] | Road - Total [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 90 years | 80 years |
Maximum [Member] | Road - Grading [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 90 years |  |
Maximum [Member] | Total Equipment [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 38 years | 38 years |
Maximum [Member] | Equipment - Work Equipment and Other [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 38 years |  |
SunRail Transaction - Sale of Corridor [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Abnormal gains and losses |  | $ 43 us-gaap_GainLossOnDispositionOfAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = csx_SunrailTransactionSaleOfCorridorMember | $ 94 us-gaap_GainLossOnDispositionOfAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = csx_SunrailTransactionSaleOfCorridorMember

X
- Details
Name: | csx_CapitalExpendituresAbstract
Namespace Prefix: | csx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of depreciable asset categories to account for depreciation expense for the railroad assets that are depreciated under the group life method. + References No definition available. + Details
Name: | csx_NumberOfDepreciableAssetCategoriesForRailroadAssets
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of total gross assets depreciated under the group-life method of accounting. Does not include other assets which are depreciated on a straight line basis. + References No definition available. + Details
Name: | csx_PercentageOfAssetsDepreciatedUnderGroupLifeMethod
Namespace Prefix: | csx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of labor costs relating to the deconstruction of old track based upon an analysis of track replacement process. + References No definition available. + Details
Name: | csx_PercentageOfLaborCostRailInstallationDeconstructionOfOldTrack
Namespace Prefix: | csx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of labor costs relating to the installation of new track based upon an analysis of track replacement process. + References No definition available. + Details
Name: | csx_PercentageOfLaborCostRailInstallationInstallationOfNewTrack
Namespace Prefix: | csx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The frequency with which life studies are required, by Surface Transporation Board (STB) to be performed. + References No definition available. + Details
Name: | csx_PropertyPlantAndEquipmentLifeStudiesFrequencyPeriod
Namespace Prefix: | csx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | csx_RailroadAssetsAbstract
Namespace Prefix: | csx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_GainLossOnDispositionOfAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=csx_AbnormalgainlossonoperatingpropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=csx_EquipmentWorkEquipmentAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=csx_GainlossonnonoperatingpropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=csx_RoadGradingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=csx_RoadOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=csx_RoadTiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=csx_RoadTotalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=csx_TotalEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=csx_SunrailTransactionSaleOfCorridorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |