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Commitments and Contingencies (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
2022    
Disclosure Of Commitments [Line Items]    
Product transportation $ 967  
North West Redwater Partnership service toll 122  
Other 37  
2023    
Disclosure Of Commitments [Line Items]    
Product transportation 1,107  
North West Redwater Partnership service toll 123  
Other 27  
2024    
Disclosure Of Commitments [Line Items]    
Product transportation 914  
North West Redwater Partnership service toll 121  
Other 22  
2025    
Disclosure Of Commitments [Line Items]    
Product transportation 870  
North West Redwater Partnership service toll 119  
Other 20  
2026    
Disclosure Of Commitments [Line Items]    
Product transportation 816  
North West Redwater Partnership service toll 97  
Other 15  
Thereafter    
Disclosure Of Commitments [Line Items]    
Product transportation 10,028  
North West Redwater Partnership service toll 3,671  
Other $ 0  
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, toll payer percent 25.00% 25.00%
Interest payable included in service toll $ 1,486  
Term of commitment to joint venture 40 years  
Offshore vessels and equipment | 2022    
Disclosure Of Commitments [Line Items]    
Offshore vessels and equipment, field equipment and power $ 62  
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 | 2025    
Disclosure Of Commitments [Line Items]    
Offshore vessels and equipment, field equipment and power 0  
Offshore vessels and equipment | 2026    
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 | 2022    
Disclosure Of Commitments [Line Items]    
Offshore vessels and equipment, field equipment and power 25  
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 21  
Field equipment and power | 2025    
Disclosure Of Commitments [Line Items]    
Offshore vessels and equipment, field equipment and power 21  
Field equipment and power | 2026    
Disclosure Of Commitments [Line Items]    
Offshore vessels and equipment, field equipment and power 21  
Field equipment and power | Thereafter    
Disclosure Of Commitments [Line Items]    
Offshore vessels and equipment, field equipment and power 225  
STORM Resources Ltd    
Disclosure Of Commitments [Line Items]    
Product transportation and processing obligation, unrecorded $ 298  
Painted Pony Energy Ltd    
Disclosure Of Commitments [Line Items]    
Product transportation and processing obligation, unrecorded   $ 2,400