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DISCONTINUED OPERATIONS - Net Earnings (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
NET EARNINGS (LOSS) FROM DISCONTINUED OPERATIONS ATTRIBUTABLE TO OWENS CORNING, NET OF TAX | $ 29 | $ 29 | $ (319) | $ 50
Discontinued Operations, Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
NET SALES | 306 | 292 | 576 | 575
COST OF SALES | 230 | 238 | 434 | 469
Marketing and administrative expenses | 18 | 20 | 35 | 42
Loss from classification as discontinued operation | 19 | 0 | 381 | 0
Other expense, net | 3 | (5) | 5 | (2)
Total operating expenses | 40 | 15 | 421 | 40
Interest expense, net | 1 | 1 | 2 | 2
Income tax expense | 6 | 9 | 38 | 14
NET EARNINGS (LOSS) FROM DISCONTINUED OPERATIONS ATTRIBUTABLE TO OWENS CORNING, NET OF TAX | $ 29 | $ 29 | $ (319) | $ 50

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