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v3.21.1

Subsequent Event (Details) - Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations - Line Segments $ in Millions | 24 Months Ended |
--- | --- | ---
Mar. 26, 2023 | Mar. 26, 2021 USD ($) phase lineSegment
Subsequent Event [Line Items] |  |
Number of line segments for sale | lineSegment |  | 3
Number of phases to complete sale transaction | phase |  | 3
Total sale price | $ |  | $ 525
Subsequent Event | Forecast |  |
Subsequent Event [Line Items] |  |
Period to complete closing on the remaining sale transaction | 2 years |

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- Definition Disposal Group, Including Discontinued Operation, Number Of Disposal Groups + References No definition available. + Details
Name: | csx_DisposalGroupIncludingDiscontinuedOperationNumberOfDisposalGroups
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Disposal Group, Including Discontinued Operations, Number Of Phases To Complete Sale Transaction + References No definition available. + Details
Name: | csx_DisposalGroupIncludingDiscontinuedOperationsNumberOfPhasesToCompleteSaleTransaction
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Disposal Group, Including Discontinued Operations. Period To Complete Sale Transaction + References No definition available. + Details
Name: | csx_DisposalGroupIncludingDiscontinuedOperationsPeriodToCompleteSaleTransaction
Namespace Prefix: | csx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=csx_LineSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |