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CONTINGENT LIABILITIES AND OTHER MATTERS (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) site
Unusual or Infrequent Item, or Both [Line Items]
Environmental liability sites | site		25
Environmental exit costs, accrual | $		$ 3
Environmental exit costs, accrual, current | $		$ 2
Monetary sanctions | $	$ 1
Superfund Site
Unusual or Infrequent Item, or Both [Line Items]
Environmental liability sites | site		10
Owned or Formally Owned Sites
Unusual or Infrequent Item, or Both [Line Items]
Environmental liability sites | site		15

X

- Definition

Environmental Exit Costs, Costs Accrued to Date, Current

+ References

No definition available.

+ Details

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- Definition

Number of sites where there is a continuing legal obligation to either complete remedial actions or contribute to the completion of remedial actions regarding environmental matters.

+ References

No definition available.

+ Details

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Namespace Prefix:	oc_
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X

- Definition

Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.Y.Q4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1

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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

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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

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