v3.26.1
SEGMENT INFORMATION - Net Sales by Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Net sales $ 2,756 $ 2,747 $ 5,021 $ 5,277
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,797 2,791 5,099 5,360
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (41) (44) (78) (83)
Europe        
Disaggregation of Revenue [Line Items]        
Net sales 334 292 629 560
Europe | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 335 293 631 563
Europe | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (1) (1) (2) (3)
Asia Pacific        
Disaggregation of Revenue [Line Items]        
Net sales 1 36 3 65
Asia Pacific | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1 36 3 65
Asia Pacific | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales 0 0 0 0
Rest of World        
Disaggregation of Revenue [Line Items]        
Net sales 9 8 16 17
Rest of World | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 9 8 16 17
Rest of World | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales 0 0 0 0
North America        
Disaggregation of Revenue [Line Items]        
Net sales 2,412 2,411 4,373 4,635
North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,452 2,454 4,449 4,715
North America | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (40) (43) (76) (80)
Insulation | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 971 934 1,838 1,843
Insulation | Europe | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 217 180 402 346
Insulation | Asia Pacific | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 0 31 0 56
Insulation | Rest of World | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 4 4 8 8
Insulation | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 750 719 1,428 1,433
Roofing | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,313 1,303 2,273 2,423
Roofing | Europe | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 58 55 110 103
Roofing | Asia Pacific | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1 2 3 6
Roofing | Rest of World | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 0 0 0 0
Roofing | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,254 1,246 2,160 2,314
Doors | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 513 554 988 1,094
Doors | Europe | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 60 58 119 114
Doors | Asia Pacific | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 0 3 0 3
Doors | Rest of World | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 5 4 8 9
Doors | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 448 489 861 968
Residential | North America        
Disaggregation of Revenue [Line Items]        
Net sales 1,888 1,923 3,416 3,717
Residential | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,925 1,963 3,487 3,792
Residential | North America | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (37) (40) (71) (75)
Residential | Insulation | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 354 346 700 728
Residential | Roofing | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,123 1,128 1,926 2,096
Residential | Doors | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 448 489 861 968
Commercial and Industrial Sector | North America        
Disaggregation of Revenue [Line Items]        
Net sales 524 488 957 918
Commercial and Industrial Sector | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 527 491 962 923
Commercial and Industrial Sector | North America | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (3) (3) (5) (5)
Commercial and Industrial Sector | Insulation | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 396 373 728 705
Commercial and Industrial Sector | Roofing | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 131 118 234 218
Commercial and Industrial Sector | Doors | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 0 $ 0 $ 0 $ 0