v3.25.4
PROVISIONS (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in other provisions [abstract]    
Beginning balance $ 82  
Additions 15  
Usage (11)  
Adjustments to existing provisions (12)  
Ending balance 74  
Long-term 55 $ 61
Other current liabilities    
Reconciliation of changes in other provisions [abstract]    
Current (recorded in "other current liabilities") 19  
Decommissioning liabilities    
Reconciliation of changes in other provisions [abstract]    
Beginning balance 65  
Additions 15  
Usage (11)  
Adjustments to existing provisions (7)  
Ending balance 62  
Long-term 49  
Decommissioning liabilities | Other current liabilities    
Reconciliation of changes in other provisions [abstract]    
Current (recorded in "other current liabilities") 13  
Other    
Reconciliation of changes in other provisions [abstract]    
Beginning balance 17  
Additions 0  
Usage 0  
Adjustments to existing provisions (5)  
Ending balance 12  
Long-term 6  
Other | Other current liabilities    
Reconciliation of changes in other provisions [abstract]    
Current (recorded in "other current liabilities") $ 6