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Commitments and Contingencies (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
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%
Interest payable included in service toll $ 2,863
Term of commitment to joint venture 40 years
2023  
Disclosure Of Commitments [Line Items]  
Product transportation and processing $ 1,171
North West Redwater Partnership service toll 151
Other 23
2023 | Offshore vessels and equipment  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 44
2023 | Field equipment and power  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 36
2024  
Disclosure Of Commitments [Line Items]  
Product transportation and processing 1,349
North West Redwater Partnership service toll 152
Other 24
2024 | Offshore vessels and equipment  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 35
2024 | Field equipment and power  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 27
2025  
Disclosure Of Commitments [Line Items]  
Product transportation and processing 1,168
North West Redwater Partnership service toll 151
Other 21
2025 | Offshore vessels and equipment  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 0
2025 | Field equipment and power  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 24
2026  
Disclosure Of Commitments [Line Items]  
Product transportation and processing 1,102
North West Redwater Partnership service toll 133
Other 16
2026 | Offshore vessels and equipment  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 0
2026 | Field equipment and power  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 23
2027  
Disclosure Of Commitments [Line Items]  
Product transportation and processing 1,052
North West Redwater Partnership service toll 118
Other 0
2027 | Offshore vessels and equipment  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 0
2027 | Field equipment and power  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 22
Thereafter  
Disclosure Of Commitments [Line Items]  
Product transportation and processing 11,095
North West Redwater Partnership service toll 4,884
Other $ 0
Commitments for oil and gas transportation, period of agreement 20 years
Thereafter | Offshore vessels and equipment  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power $ 0
Thereafter | Field equipment and power  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power $ 215