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ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Business Acquisition [Line Items]
Revenues	$ (2,747)	$ (2,497)	$ (5,277)	$ (4,514)
Net earnings	362	286	$ 269	584
Masonite
Business Acquisition [Line Items]
Pro Forma net sales from continuing operations	2,807			5,414
Pro Forma net earnings from continuing operations attributable to Owens Corning	$ 308			631
Masonite | Adjustment, Removal Of Sales Of Architectural Segment
Business Acquisition [Line Items]
Revenues		41		119
Masonite | Adjustment, Transaction Costs Incurred By Acquiree
Business Acquisition [Line Items]
Net earnings		56		56
Masonite | Adjustment, Transaction Costs Incurred By Acquirer
Business Acquisition [Line Items]
Net earnings		29		47
Masonite | Adjustment, Tax Impacts Of Proforma Adjustments
Business Acquisition [Line Items]
Net earnings		$ (46)		$ (90)

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