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OTHER LONG-TERM ASSETS - Summary of Assets, Liabilities, Partners' Equity and Equity (Income) Loss (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of joint ventures [line items]      
Current assets $ 3,020 $ 4,897  
Current liabilities 4,762 6,261  
Partners’ equity 31,974 31,653 $ 26,267
Equity loss (income) (2,591) (2,397) $ 204
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets 105 165  
Non-current assets 5,625 5,270  
Current liabilities 176 1,238  
Non-current liabilities 5,267 3,905  
Partners’ equity 287 292  
Equity loss (income) 5 (31)  
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets 210 330  
Non-current assets 11,250 10,540  
Current liabilities 352 2,476  
Non-current liabilities 10,534 7,810  
Partners’ equity 574 584  
Equity loss (income) $ 10 $ (62)