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OTHER LONG-TERM ASSETS - Narrative (Details)
 12 Months Ended
Dec. 31, 2017
CAD ($)
bbl
Dec. 31, 2013
Mar. 21, 2018
CAD ($)
Dec. 31, 2016
CAD ($)
Disclosure of joint ventures [line items]        
North West Redwater Partnership subordinated debt $ 510,000,000     $ 385,000,000
Borrowings $ 22,458,000,000     16,805,000,000
North West Redwater Partnership        
Disclosure of joint ventures [line items]        
Company's voting percent interest in joint venture 50.00%      
Processing agreement, barrels of bitumen feedstock per day | bbl 50,000      
Processing agreement, barrels of bitumen feedstock per date for the Company | bbl 12,500      
Processing agreement, barrels of bitumen feedstock per date for others | bbl 37,500      
Company's ownership interest in joint venture 50.00% 50.00%    
Subordinated debt interest rate variable   6.00%    
Subordinated debt contributed before accrued interest $ 411,000,000      
Accrued interest 99,000,000      
North West Redwater Partnership subordinated debt $ 510,000,000      
Percent of pro rata share of debt company has committed paying to joint venture 25.00%      
Term of commitment to joint venture 30 years      
North West Redwater Partnership        
Disclosure of joint ventures [line items]        
Processing agreement, barrels of bitumen feedstock per day | bbl 50,000      
Processing agreement term 30 years      
Facility capital cost budget for the Project $ 9,500,000,000      
Possible percentage increase in the facility capital cost budget 2.00%      
North West Redwater Partnership | 2.80% Series J Senior Secured Bonds Due June 2027        
Disclosure of joint ventures [line items]        
Bonds issued $ 750,000,000      
Bonds issued, interest rate 2.80%      
North West Redwater Partnership | 3.65% Series K Senior Secured Bonds Due June 2035        
Disclosure of joint ventures [line items]        
Bonds issued $ 750,000,000      
Bonds issued, interest rate 3.65%      
North West Redwater Partnership | 4.25% Series F Senior Secured Bonds Due June 2029        
Disclosure of joint ventures [line items]        
Bonds issued       $ 550,000,000
Bonds issued, interest rate       4.25%
North West Redwater Partnership | 4.75% Percent Series G Senior Secured Bonds Due June 2037        
Disclosure of joint ventures [line items]        
Bonds issued       $ 500,000,000
Bonds issued, interest rate       4.75%
North West Redwater Partnership | 4.15% Series H Senior Secured Bonds Due June 2033        
Disclosure of joint ventures [line items]        
Bonds issued       $ 500,000,000
Bonds issued, interest rate       4.15%
North West Redwater Partnership | 4.35% Series I Senior Secured Bonds Due January 2039        
Disclosure of joint ventures [line items]        
Bonds issued       $ 500,000,000
Bonds issued, interest rate       4.35%
North West Redwater Partnership | Syndicated credit facility        
Disclosure of joint ventures [line items]        
Borrowings $ 1,870,000,000      
Maximum credit facility $ 3,500,000,000      
Major debt transactions | North West Redwater Partnership | Syndicated credit facility        
Disclosure of joint ventures [line items]        
Maximum credit facility     $ 2,000,000,000  
Major debt transactions | North West Redwater Partnership | Non-Revolving Term Credit Facility Maturing February 2020        
Disclosure of joint ventures [line items]        
Maximum credit facility     $ 1,500,000,000