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Casualty, Environmental and Other Reserves (Environmental and Other) (Details) $ in Millions | Dec. 25, 2015 USD ($) site | Dec. 26, 2014 USD ($) | Dec. 27, 2013 USD ($) | Dec. 28, 2012 USD ($)
--- | --- | --- | --- | ---
Environmental Reserves [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Reserves | $ 82 | $ 94 | $ 100 | $ 88
Environmental impaired site | site | 242 |  |  |
Other Reserves [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Reserves | $ 49 | $ 59 | $ 71 | $ 64

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- Definition Contingencies [Line Items] + References No definition available. + Details
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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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Namespace Prefix: | csx_
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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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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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