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Employee Benefit Plans (Summary of Participants) (Details) | Dec. 25, 2015 employees
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Active Employees | 5,234 |
Retirees and Beneficiaries | 11,777 |
Other | 3,781 | [1]
Total | 20,792 |
Post-retirement Medical Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Active Employees | 1,212 |
Retirees and Beneficiaries | 12,957 |
Other | 69 | [1]
Total | 14,238 |
[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
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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

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- Definition The total employees who are participants to pension and post retirement plans as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |