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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Balance Sheet Classification (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]        
Current asset $ 101 $ 270 $ 270  
Long-term asset 1,478 1,339 1,339  
Derivative financial assets 1,439   1,500 $ 1,094
Current liability (50) (87) (87)  
Long-term liability (90) $ (22) (22)  
Before Offset Amount        
Disclosure of detailed information about financial instruments [line items]        
Current asset 101   270  
Long-term asset 1,478   1,339  
Derivative financial assets 1,579   1,609  
Current liability (50)   (87)  
Long-term liability (90)   (22)  
Derivative financial liabilities $ (140)   $ (109)