v3.26.3
SEGMENT INFORMATION - Net Sales by Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Net sales $ 2,489 $ 2,684 $ 7,510 $ 7,961
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,526 2,726 7,625 8,086
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (37) (42) (115) (125)
Europe        
Disaggregation of Revenue [Line Items]        
Net sales 313 301 942 861
Europe | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 313 302 944 865
Europe | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales 0 (1) (2) (4)
Asia Pacific        
Disaggregation of Revenue [Line Items]        
Net sales 2 2 5 67
Asia Pacific | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2 2 5 67
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 4 6 20 23
Rest of World | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 4 6 20 23
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 2,170 2,375 6,543 7,010
North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2,207 2,416 6,656 7,131
North America | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (37) (41) (113) (121)
Insulation | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,001 941 2,839 2,784
Insulation | Europe | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 206 193 608 539
Insulation | Asia Pacific | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 0 0 0 56
Insulation | Rest of World | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 0 2 8 10
Insulation | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 795 746 2,223 2,179
Roofing | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,042 1,240 3,315 3,663
Roofing | Europe | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 50 50 160 153
Roofing | Asia Pacific | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 2 2 5 8
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 990 1,188 3,150 3,502
Doors | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 483 545 1,471 1,639
Doors | Europe | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 57 59 176 173
Doors | Asia Pacific | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 0 0 0 3
Doors | Rest of World | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 4 4 12 13
Doors | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 422 482 1,283 1,450
Residential | North America        
Disaggregation of Revenue [Line Items]        
Net sales 1,624 1,887 5,040 5,604
Residential | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,659 1,926 5,146 5,718
Residential | North America | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (35) (39) (106) (114)
Residential | Insulation | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 378 374 1,078 1,102
Residential | Roofing | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 859 1,070 2,785 3,166
Residential | Doors | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 422 482 1,283 1,450
Commercial and Industrial Sector | North America        
Disaggregation of Revenue [Line Items]        
Net sales 546 488 1,503 1,406
Commercial and Industrial Sector | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 548 490 1,510 1,413
Commercial and Industrial Sector | North America | Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (2) (2) (7) (7)
Commercial and Industrial Sector | Insulation | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 417 372 1,145 1,077
Commercial and Industrial Sector | Roofing | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 131 118 365 336
Commercial and Industrial Sector | Doors | North America | Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales $ 0 $ 0 $ 0 $ 0