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OTHER LONG-TERM LIABILITIES - Schedule of other long-term liabilities (Details)
$ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2015
CAD ($)
Dec. 31, 2014
CAD ($)
Disclosure Of Other Non-Current Liabilities [Line Items]          
Asset retirement obligations   $ 4,327 $ 3,243 $ 2,950 $ 4,221
Share-based compensation   414 426 $ 128 $ 203
Risk management (note 18)   103 0    
Other   565 17    
Other liabilities   5,409 3,686    
Current portion of other long-term liabilities   1,012 463    
Other long-term liabilities   4,397 $ 3,223    
AOSP          
Disclosure Of Other Non-Current Liabilities [Line Items]          
Deferred purchase consideration payable $ 375 $ 469