v3.26.3
GOODWILL AND OTHER INTANGIBLE ASSETS - ROLLFORWARD (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2026
Dec. 31, 2025
Gross Goodwill [Roll Forward]      
Goodwill, gross, beginning balance   $ 3,796  
Divestiture   (7)  
Goodwill, Impaired, Impairment Loss   (366)  
Foreign currency translation   35  
Goodwill, gross, ending balance $ 3,754 3,754  
Accumulated Impairment Loss [Roll Forward]      
Goodwill, Impaired, Accumulated Impairment Loss   2,117  
Foreign currency translation   17  
Goodwill, Impaired, Accumulated Impairment Loss 2,466 2,466  
Goodwill, net 1,288 1,288 $ 1,679
Roofing      
Gross Goodwill [Roll Forward]      
Goodwill, gross, beginning balance   661  
Divestiture   0  
Goodwill, Impaired, Impairment Loss   0  
Foreign currency translation   2  
Goodwill, gross, ending balance 659 659  
Accumulated Impairment Loss [Roll Forward]      
Goodwill, Impaired, Accumulated Impairment Loss   0  
Foreign currency translation   0  
Goodwill, Impaired, Accumulated Impairment Loss 0 0  
Goodwill, net 659 659  
Doors      
Gross Goodwill [Roll Forward]      
Goodwill, gross, beginning balance   1,515  
Divestiture   (7)  
Goodwill, Impaired, Impairment Loss 366 (366)  
Foreign currency translation   7  
Goodwill, gross, ending balance 1,501 1,501  
Accumulated Impairment Loss [Roll Forward]      
Goodwill, Impaired, Accumulated Impairment Loss   1,135  
Foreign currency translation   0  
Goodwill, Impaired, Accumulated Impairment Loss 1,501 1,501  
Goodwill, net 0 0  
Insulation      
Gross Goodwill [Roll Forward]      
Goodwill, gross, beginning balance   1,620  
Divestiture   0  
Goodwill, Impaired, Impairment Loss   0  
Foreign currency translation   26  
Goodwill, gross, ending balance 1,594 1,594  
Accumulated Impairment Loss [Roll Forward]      
Goodwill, Impaired, Accumulated Impairment Loss   982  
Foreign currency translation   17  
Goodwill, Impaired, Accumulated Impairment Loss 965 965  
Goodwill, net $ 629 $ 629