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Nature of Operations and Significant Accounting Policies (Details) mi in Thousands | Sep. 30, 2025 state mi
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Rail route network, distance | mi | 20
Number of states rail network serves | state | 26

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- Definition Rail Route Network, Distance + References No definition available. + Details
Name: | csx_RailRouteNetworkDistance
Namespace Prefix: | csx_
Data Type: | dtr-types:lengthItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration