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Casualty, Environmental and Other Reserves (Casualty) (Details) (Casualty [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 26, 2014 claims | Dec. 27, 2013 | Dec. 28, 2012 | Dec. 30, 2011
Casualty [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual | $ 265 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | $ 280 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | $ 325 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | $ 372 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember
Self-insured retention amount per injury | 50 us-gaap_SelfInsuranceReserve / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember |  |  |
Individual claims expected to exceed self-insured retention amount | 0 csx_LossContingencyNumberOfClaimsExpectedToExceedSelfInsuredRetentionAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember |  |  |
Change in estimate recorded to adjust reserves | $ 0 csx_AccrualForLossContingenciesIncreaseDecreaseForRevisionInEstimate / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | $ 0 csx_AccrualForLossContingenciesIncreaseDecreaseForRevisionInEstimate / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | $ 0 csx_AccrualForLossContingenciesIncreaseDecreaseForRevisionInEstimate / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember |

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- Definition Changes in casualty reserves based on management's review of the actuarial analysis performed by an independent actuarial firm. + References No definition available. + Details
Name: | csx_AccrualForLossContingenciesIncreaseDecreaseForRevisionInEstimate
Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total number of claims expected to exceed self-insured retention amount, as of the balance sheet date. + References No definition available. + Details
Name: | csx_LossContingencyNumberOfClaimsExpectedToExceedSelfInsuredRetentionAmount
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SelfInsuranceReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant