v3.26.1
RESTRUCTURING, ACQUISITION AND DIVESTITURE-RELATED COSTS (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Nov. 04, 2024
Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs   $ 23 $ 18 $ 69 $ 21        
Restructuring Reserve Roll Forward                  
Restructuring Costs   23 18 69 21        
Acquisition-Related Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       37 17        
Restructuring Reserve Roll Forward                  
Beginning Balance       11 3        
Restructuring Costs       37 17        
Payments       (26) (5)        
Accelerated depreciation and other non-cash items       (17) (9)        
Ending Balance   5 6 5 6        
Cumulative charges incurred   146 72 146 72        
Acquisition-related Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       0 5        
Restructuring Reserve Roll Forward                  
Beginning Balance       10 14        
Restructuring Costs       0 5        
Payments       (10) (3)        
Accelerated depreciation and other non-cash items       0 2        
Ending Balance   0 18 0 18        
Cumulative charges incurred   40 38 40 38        
European Operating Structure Optimization                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       0 (1)        
Expected cost                 $ 20
Severance Costs         1        
Restructuring Reserve Roll Forward                  
Beginning Balance       0 5        
Restructuring Costs       0 (1)        
Payments       0 (2)        
Accelerated depreciation and other non-cash items       0 0        
Ending Balance   0 2 0 2        
Cumulative charges incurred   12 14 12 14        
Building Materials Business Exit                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       0 0        
Restructuring Reserve Roll Forward                  
Beginning Balance       0 6        
Restructuring Costs       0 0        
Payments       0 0        
Accelerated depreciation and other non-cash items       0 0        
Ending Balance   0 6 0 6        
Cumulative charges incurred   4 6 4 6        
Roofing Integration Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       2          
Restructuring Reserve Roll Forward                  
Beginning Balance       1          
Restructuring Costs       2          
Payments       (1)          
Accelerated depreciation and other non-cash items       (2)          
Ending Balance   0   0          
Cumulative charges incurred   10   10          
Global Corporate Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       30          
Restructuring Reserve Roll Forward                  
Beginning Balance       0          
Restructuring Costs       30          
Payments       (6)          
Accelerated depreciation and other non-cash items       0          
Ending Balance   24   24          
Cumulative charges incurred   30   30          
Severance                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring Charges   0 (7) (32) (9)        
Restructuring Reserve Roll Forward                  
Ending Balance   29   29          
Severance | Global Corporate Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       30          
Restructuring Reserve Roll Forward                  
Restructuring Costs       30          
Employee Severance And Other Exit Costs | Acquisition-Related Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       20 8        
Restructuring Reserve Roll Forward                  
Restructuring Costs       20 8        
Employee Severance And Other Exit Costs | Acquisition-related Restructuring | Minimum                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost   20   20          
Employee Severance And Other Exit Costs | Acquisition-related Restructuring | Maximum                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost   30   30          
Employee Severance And Other Exit Costs | Building Materials Business Exit                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost               $ 15  
Employee Severance And Other Exit Costs | Acquisition-Related Restructuring, Prineville                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost     12   12        
Employee Severance And Other Exit Costs | Acquisition-Related Restructuring, Greenville                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost $ 7                
Employee Severance And Other Exit Costs | Acquisition-Related Restructuring, Aldergrove                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost             $ 22    
Employee Severance And Other Exit Costs | Acquisition-Related Restructuring, Mesquite                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost             2    
Employee Severance And Other Exit Costs | Global Corporate Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost           $ 58      
Employee Severance And Other Exit Costs | Acquisition-Related Restructuring, Walkerton                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost   6   6          
Accelerated depreciation                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring Charges   (7) (9) (10) (9)        
Accelerated depreciation | Acquisition-Related Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs       17 9        
Restructuring Reserve Roll Forward                  
Restructuring Costs       17 9        
Accelerated depreciation | Acquisition-related Restructuring | Minimum                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost   15   15          
Accelerated depreciation | Acquisition-related Restructuring | Maximum                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost   20   20          
Accelerated depreciation | Acquisition-Related Restructuring, Greenville                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost 10                
Accelerated depreciation | Acquisition-Related Restructuring, Aldergrove                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost             7    
Accelerated depreciation | Acquisition-Related Restructuring, Mesquite                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost             $ 7    
Accelerated depreciation | Acquisition-Related Restructuring, Walkerton                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost   7   7          
Additional Exit Costs | Cost of sales                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring Charges   (2) (1) (7) (1)        
Additional Exit Costs | Other Expense [Member]                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring Charges   (14) 0 (20) (1)        
Additional Exit Costs | Marketing & administrative expenses                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring Charges   $ 0 (1) $ 0 (1)        
Accelerated Depreciation, Asset Write-Offs, And Other Exit Costs | Roofing Integration Restructuring                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs 22                
Restructuring Reserve Roll Forward                  
Restructuring Costs $ 22                
Accelerated Depreciation And Inventory Write-Offs | Acquisition-Related Restructuring, Prineville                  
Restructuring Cost and Reserve [Line Items]                  
Expected cost     $ 30   $ 30