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v3.20.2

Revenues - Narrative (Details) | 6 Months Ended
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Jun. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Contract payment period | 15 days
Minimum |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Transit time | 3 days
Maximum |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Transit time | 8 days

X
- 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

X
- 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

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

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

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