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v2.4.1.9

Employee Benefit Plans (Summary of Participants) (Details) | Dec. 27, 2013 employees
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Active Employees | 5,136 csx_ActiveParticipatingEmployees / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Retirees and Beneficiaries | 11,699 csx_RetireesAndBeneficiariesParticipating / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Other | 5,444 csx_OtherParticipatingEmployees / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | [1]
Total | 22,279 csx_TotalParticipatingEmployees / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Post-retirement Medical Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Active Employees | 2,031 csx_ActiveParticipatingEmployees / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
Retirees and Beneficiaries | 12,148 csx_RetireesAndBeneficiariesParticipating / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
Other | 87 csx_OtherParticipatingEmployees / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | [1]
Total | 14,266 csx_TotalParticipatingEmployees / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
[1] | For pension plans, the other category consists mostly of terminated but vested former employees. For post-retirement plans, the other category consists of employees on long-term disability that have not yet retired.

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- Definition The total active employees who are participants to pension and post retirement plans as of the balance sheet date. + References No definition available. + Details
Name: | csx_ActiveParticipatingEmployees
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The total other employees who are participants to pension and post retirement plans as of the balance sheet date. + References No definition available. + Details
Name: | csx_OtherParticipatingEmployees
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The total Retirees and Beneficiaries employees who are participants to pension and post retirement plans as of the balance sheet date. + References No definition available. + Details
Name: | csx_RetireesAndBeneficiariesParticipating
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total employees who are participants to pension and post retirement plans as of the balance sheet date. + References No definition available. + Details
Name: | csx_TotalParticipatingEmployees
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Data Type: | na
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