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COMMITMENTS AND CONTINGENCIES (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Jun. 01, 2018
2019    
Disclosure Of Commitments [Line Items]    
Product transportation and pipeline $ 692  
North West Redwater Partnership service toll (1) 86  
Other 85  
2020    
Disclosure Of Commitments [Line Items]    
Product transportation and pipeline 664  
North West Redwater Partnership service toll (1) 126  
Other 35  
2021    
Disclosure Of Commitments [Line Items]    
Product transportation and pipeline 620  
North West Redwater Partnership service toll (1) 157  
Other 32  
2022    
Disclosure Of Commitments [Line Items]    
Product transportation and pipeline 516  
North West Redwater Partnership service toll (1) 158  
Other 32  
2023    
Disclosure Of Commitments [Line Items]    
Product transportation and pipeline 381  
North West Redwater Partnership service toll (1) 157  
Other 31  
Thereafter    
Disclosure Of Commitments [Line Items]    
Product transportation and pipeline 3,991  
North West Redwater Partnership service toll (1) 2,858  
Other $ 424  
North West Redwater Partnership    
Disclosure Of Commitments [Line Items]    
Percent of pro rata share of debt company has committed paying to joint venture 25.00% 25.00%
Interest payable included in service toll $ 1,301  
Term of commitment to joint venture 30 years  
Offshore equipment operating leases | 2019    
Disclosure Of Commitments [Line Items]    
Office leases $ 94  
Offshore equipment operating leases | 2020    
Disclosure Of Commitments [Line Items]    
Office leases 73  
Offshore equipment operating leases | 2021    
Disclosure Of Commitments [Line Items]    
Office leases 75  
Offshore equipment operating leases | 2022    
Disclosure Of Commitments [Line Items]    
Office leases 8  
Offshore equipment operating leases | 2023    
Disclosure Of Commitments [Line Items]    
Office leases 0  
Offshore equipment operating leases | Thereafter    
Disclosure Of Commitments [Line Items]    
Office leases 0  
Office leases | 2019    
Disclosure Of Commitments [Line Items]    
Office leases 42  
Office leases | 2020    
Disclosure Of Commitments [Line Items]    
Office leases 42  
Office leases | 2021    
Disclosure Of Commitments [Line Items]    
Office leases 39  
Office leases | 2022    
Disclosure Of Commitments [Line Items]    
Office leases 31  
Office leases | 2023    
Disclosure Of Commitments [Line Items]    
Office leases 32  
Office leases | Thereafter    
Disclosure Of Commitments [Line Items]    
Office leases $ 89