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PROVISIONS (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Reconciliation of changes in other provisions [abstract]      
Balance $ 39    
Adjustments to existing provisions 7    
Amounts used (2)    
Balance 44    
Current (recorded in other current liabilities) 141 $ 132 $ 132
Long-term 36 $ 35 $ 35
Other current liabilities      
Reconciliation of changes in other provisions [abstract]      
Current (recorded in other current liabilities) 8    
Decommissioning Liabilities      
Reconciliation of changes in other provisions [abstract]      
Balance 36    
Adjustments to existing provisions 7    
Amounts used (2)    
Balance 41    
Long-term 34    
Decommissioning Liabilities | Other current liabilities      
Reconciliation of changes in other provisions [abstract]      
Current (recorded in other current liabilities) 7    
Other      
Reconciliation of changes in other provisions [abstract]      
Balance 3    
Adjustments to existing provisions 0    
Amounts used 0    
Balance 3    
Long-term 2    
Other | Other current liabilities      
Reconciliation of changes in other provisions [abstract]      
Current (recorded in other current liabilities) $ 1