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FINANCIAL INSTRUMENTS - Maturity dates for financial liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Accounts payable $ 779 $ 775  
Accrued liabilities 2,356 2,597  
Other long-term liabilities 3,890 4,397  
Long-term debt 20,623 22,458  
Interest and other financing expense 798 728 $ 431
Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 20,742 $ 22,597  
Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,141    
1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 5,996    
Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 9,793    
Liquidity risk | Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 779    
Accrued liabilities 2,356    
Other long-term liabilities 42    
Interest and other financing expense 836    
Liquidity risk | Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,141    
Liquidity risk | 1 to less than 2 years      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 24    
Interest and other financing expense 755    
Liquidity risk | 1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 5,996    
Liquidity risk | 2 to less than 5 years      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 69    
Interest and other financing expense 1,668    
Liquidity risk | 2 to less than 5 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 3,812    
Liquidity risk | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 0    
Interest and other financing expense 5,327    
Liquidity risk | Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt $ 9,793