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INCOME TAXES - Deferred Income (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 28, 2019
May 27, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Line Items]          
Impact of income tax rate and legislative changes $ 1,116     $ 1,067  
Applicable tax rate   12.00%   26.74% 27.04%
Corporate and Eliminations segment          
Income Tax Disclosure [Line Items]          
Impact of income tax rate and legislative changes     $ 48    
Oil Sands | Operating segments          
Income Tax Disclosure [Line Items]          
Impact of income tax rate and legislative changes     910    
Refining and Marketing | Operating segments          
Income Tax Disclosure [Line Items]          
Impact of income tax rate and legislative changes     88    
Exploration and Production | Operating segments          
Income Tax Disclosure [Line Items]          
Impact of income tax rate and legislative changes     $ 70    
2019          
Income Tax Disclosure [Line Items]          
Applicable tax rate 11.00%        
2020          
Income Tax Disclosure [Line Items]          
Applicable tax rate 10.00%        
2021          
Income Tax Disclosure [Line Items]          
Applicable tax rate 9.00%        
2022          
Income Tax Disclosure [Line Items]          
Applicable tax rate 8.00%