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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
CAD ($)
2018  
Disclosure Of Commitments [Line Items]  
Product transportation and pipeline $ 680
Other 87
2019  
Disclosure Of Commitments [Line Items]  
Product transportation and pipeline 584
Other 41
2020  
Disclosure Of Commitments [Line Items]  
Product transportation and pipeline 526
Other 40
2021  
Disclosure Of Commitments [Line Items]  
Product transportation and pipeline 482
Other 39
2022  
Disclosure Of Commitments [Line Items]  
Product transportation and pipeline 422
Other 43
Thereafter  
Disclosure Of Commitments [Line Items]  
Product transportation and pipeline 3,868
Other $ 333
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%
Term of commitment to joint venture 30 years
Offshore equipment operating leases | 2018  
Disclosure Of Commitments [Line Items]  
Office leases $ 181
Offshore equipment operating leases | 2019  
Disclosure Of Commitments [Line Items]  
Office leases 92
Offshore equipment operating leases | 2020  
Disclosure Of Commitments [Line Items]  
Office leases 70
Offshore equipment operating leases | 2021  
Disclosure Of Commitments [Line Items]  
Office leases 68
Offshore equipment operating leases | 2022  
Disclosure Of Commitments [Line Items]  
Office leases 8
Offshore equipment operating leases | Thereafter  
Disclosure Of Commitments [Line Items]  
Office leases 0
Office leases | 2018  
Disclosure Of Commitments [Line Items]  
Office leases 43
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 30
Office leases | Thereafter  
Disclosure Of Commitments [Line Items]  
Office leases $ 118