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CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
NET LOSS $ (250) $ (494) $ (127) $ (225)
Currency translation adjustment (net of tax of $0 and $0 for the three months ended September 30, 2026 and 2025, respectively, and $0 and $0 for the nine months ended September 30, 2026 and 2025, respectively) (33) (6) 62 251
Pension and other postretirement adjustment (net of tax of $0 and $0 for the three months ended September 30, 2026 and 2025, respectively, and $(1) and $1 for the nine months ended September 30, 2026 and 2025, respectively) (1) 1 0 (7)
Other Comprehensive Income (Loss), Derivatives Qualified as Hedges, Net of Tax 0 (1) (1) (6)
Other comprehensive loss, net of tax (34) (6) 61 238
TOTAL COMPREHENSIVE (LOSS) EARNINGS (284) (500) (66) 13
Comprehensive (loss) earnings attributable to noncontrolling interests 0 (1) 0 1
COMPREHENSIVE (LOSS) EARNINGS ATTRIBUTABLE TO OWENS CORNING $ (284) $ (499) $ (66) $ 12