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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of joint ventures [line items]      
Current assets $ 4,897 $ 4,336  
Current liabilities 6,261 5,092  
Equity 31,653 26,267 $ 27,381
Equity income (2,397) 204 $ 637
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets 165 48  
Non-current assets 5,270 4,129  
Current liabilities 1,238 286  
Non-current liabilities 3,905 3,630  
Equity 292 261  
Equity income (31) (7)  
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets 330 96  
Non-current assets 10,540 8,258  
Current liabilities 2,476 572  
Non-current liabilities 7,810 7,260  
Equity 584 522  
Equity income $ (62) $ (14)