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v3.19.3.a.u2

Revenues - Narrative (Details) | 12 Months Ended
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Dec. 31, 2019
Concentration Risk [Line Items] |
Payment period after invoice date | 15 days
Minimum |
Concentration Risk [Line Items] |
Average transit time to complete a shipment | 3 days
Maximum |
Concentration Risk [Line Items] |
Average transit time to complete a shipment | 8 days

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- Definition Contract with Customer, Timing of Satisfaction of Performance Obligation, Payment Period + References No definition available. + Details
Name: | csx_ContractwithCustomerTimingofSatisfactionofPerformanceObligationPaymentPeriod
Namespace Prefix: | csx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue, Performance Obligation, Average Transit Time + References No definition available. + Details
Name: | csx_RevenuePerformanceObligationAverageTransitTime
Namespace Prefix: | csx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |