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Employee Benefit Plans - Summary of Participants (Details) | Jan. 01, 2021 employee
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Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Active Employees | 3,019
Retirees and Beneficiaries | 11,659
Other | 3,748
Total | 18,426
Post-retirement Medical Plan |
Defined Benefit Plan Disclosure [Line Items] |
Active Employees | 698
Retirees and Beneficiaries | 847
Other | 0
Total | 1,545

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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

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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
Name: | csx_TotalParticipatingEmployees
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |