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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
NET EARNINGS FROM CONTINUING OPERATIONS ATTRIBUTABLE TO OWENS CORNING $ 334 $ 256 $ 589 $ 534
Net earnings (loss) from discontinued operations attributable to Owens Corning, net of tax 29 29 (319) 50
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING $ 363 $ 285 $ 270 $ 584
Basic (in shares) 85,000,000.0 87,200,000 85,400,000 87,300,000
Non-vested restricted stock units and performance share units (in shares) 500,000 800,000 500,000 800,000
Weighted-average number of shares outstanding and common equivalent shares used for diluted earnings per share 85,500,000 88,000,000.0 85,900,000 88,100,000
Basic - continuing operations (in dollars per share) $ 3.93 $ 2.94 $ 6.90 $ 6.12
Basic - discontinued operations (in dollars per share) 0.34 0.33 (3.74) 0.57
Basic (in dollars per share) 4.27 3.27 3.16 6.69
Diluted - continuing operations (in dollars per share) 3.91 2.91 6.86 6.06
Diluted - discontinued operations (in dollars per share) 0.34 0.33 (3.71) 0.57
Diluted (in dollars per share) $ 4.25 $ 3.24 $ 3.15 $ 6.63
Antidilutive securities excluded from computation of earnings per share amount 0 0 0 0