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LONG-TERM DEBT - Principal Repayments (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 13,390 $ 12,692 $ 15,330
Gross carrying amount      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 14,404 $ 14,555  
2020      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 900    
2021      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,450    
2021      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 600    
2022      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 1,842