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PROVISIONS (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in other provisions [abstract]    
Balance $ 44  
Additions 1  
Adjustments to existing provisions 5  
Amounts used (4)  
Balance 46  
Current (recorded in "other current liabilities") 243 $ 191
Long-term 42 $ 36
Other current liabilities    
Reconciliation of changes in other provisions [abstract]    
Current (recorded in "other current liabilities") 4  
Decommissioning Liabilities    
Reconciliation of changes in other provisions [abstract]    
Balance 41  
Additions 0  
Adjustments to existing provisions 5  
Amounts used (1)  
Balance 45  
Long-term 41  
Decommissioning Liabilities | Other current liabilities    
Reconciliation of changes in other provisions [abstract]    
Current (recorded in "other current liabilities") 4  
Other    
Reconciliation of changes in other provisions [abstract]    
Balance 3  
Additions 1  
Adjustments to existing provisions 0  
Amounts used (3)  
Balance 1  
Long-term 1  
Other | Other current liabilities    
Reconciliation of changes in other provisions [abstract]    
Current (recorded in "other current liabilities") $ 0