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v3.21.1

Casualty, Environmental and Other Reserves - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) claim site | Dec. 31, 2020 USD ($)
All Contingencies Reserves [Line Items] |  |
Total reserves | $ 318,000,000 | $ 314,000,000
Casualty |  |
All Contingencies Reserves [Line Items] |  |
Total reserves | 200,000,000 | 196,000,000
Self-insured retention amount, per occurrence | $ 75,000,000 |
Number of individual claims expected to exceed self insured retention amount | claim | 0 |
Environmental |  |
All Contingencies Reserves [Line Items] |  |
Total reserves | $ 77,000,000 | 76,000,000
Environmental impaired sites | site | 220 |
Other |  |
All Contingencies Reserves [Line Items] |  |
Total reserves | $ 41,000,000 | $ 42,000,000

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- Definition Total number of claims expected to exceed self-insured retention amount, as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of environmentally impaired sites at which the Company has been identified as a potentially responsible party. + References No definition available. + Details
Name: | csx_NumberOfImpairedSites
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Self insured retention amount for casualty and catastrophic property programs. + References No definition available. + Details
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Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Details
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- Details
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- Details
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