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Commitments and Contingencies (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Jun. 27, 2019
Jan. 01, 2019
Jun. 01, 2018
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power     $ 1,113  
2020        
Disclosure Of Commitments [Line Items]        
Product transportation $ 730      
North West Redwater Partnership service toll 133      
Other 26      
2021        
Disclosure Of Commitments [Line Items]        
Product transportation 722      
North West Redwater Partnership service toll 167      
Other 20      
2022        
Disclosure Of Commitments [Line Items]        
Product transportation 637      
North West Redwater Partnership service toll 157      
Other 17      
2023        
Disclosure Of Commitments [Line Items]        
Product transportation 726      
North West Redwater Partnership service toll 164      
Other 17      
2024        
Disclosure Of Commitments [Line Items]        
Product transportation 699      
North West Redwater Partnership service toll 156      
Other 17      
Thereafter        
Disclosure Of Commitments [Line Items]        
Product transportation 7,907      
North West Redwater Partnership service toll 2,815      
Other $ 30      
Commitments for oil and gas transportation, period of agreement 20 years      
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 $ 1,260      
Term of commitment to joint venture 30 years      
Offshore vessels and equipment | 2020        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power $ 69      
Offshore vessels and equipment | 2021        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 63      
Offshore vessels and equipment | 2022        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 9      
Offshore vessels and equipment | 2023        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 0      
Offshore vessels and equipment | 2024        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 0      
Offshore vessels and equipment | Thereafter        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 0      
Field equipment and power | 2020        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 27      
Field equipment and power | 2021        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 21      
Field equipment and power | 2022        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 20      
Field equipment and power | 2023        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 21      
Field equipment and power | 2024        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power 20      
Field equipment and power | Thereafter        
Disclosure Of Commitments [Line Items]        
Offshore vessels and equipment, field equipment and power $ 249      
Devon        
Disclosure Of Commitments [Line Items]        
Product transportation   $ 2,381