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OTHER LONG-TERM LIABILITIES - Schedule of other long-term liabilities (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2015
CAD ($)
Disclosure Of Other Non-Current Liabilities [Line Items]          
Asset retirement obligations $ 3,886   $ 4,327 $ 3,243 $ 2,950
Share-based compensation 124   414 $ 426 $ 128
Risk management (note 19) 17   103    
Other 80   96    
Other liabilities 4,225   5,409    
Less: current portion 335   1,012    
Other long-term liabilities 3,890   4,397    
Deferred purchase consideration payable 118   469    
Annual installment amount $ 25        
Installment period 5 years        
AOSP          
Disclosure Of Other Non-Current Liabilities [Line Items]          
Deferred purchase consideration payable $ 118 $ 375 $ 469