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Casualty, Environmental and Other Reserves (Environmental and Other) (Details) (USD $) In Millions, unless otherwise specified | Dec. 26, 2014 sites | Dec. 27, 2013 | Dec. 28, 2012 | Dec. 30, 2011
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Environmental Reserves [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual | $ 94 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember | $ 100 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember | $ 88 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember | $ 83 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember
Environmental impaired site | 250 csx_NumberOfImpairedSites / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |  |  |
Other Reserves [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual | $ 59 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember | $ 71 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember | $ 64 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember | $ 64 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember

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- Definition Number of environmentally impaired sites at which the Company has been identified as a potentially responsible party. + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Details
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