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Commitments and Contingencies (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
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 $ 3,011
Term of commitment to joint venture 40 years
2024  
Disclosure Of Commitments [Line Items]  
Product transportation and processing $ 1,572
North West Redwater Partnership service toll 158
Other 145
2024 | Offshore vessels and equipment  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 36
2024 | Field equipment and power  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 38
2025  
Disclosure Of Commitments [Line Items]  
Product transportation and processing 1,595
North West Redwater Partnership service toll 157
Other 111
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 25
2026  
Disclosure Of Commitments [Line Items]  
Product transportation and processing 1,408
North West Redwater Partnership service toll 139
Other 112
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 1,358
North West Redwater Partnership service toll 126
Other 25
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
2028  
Disclosure Of Commitments [Line Items]  
Product transportation and processing 1,242
North West Redwater Partnership service toll 130
Other 26
2028 | Offshore vessels and equipment  
Disclosure Of Commitments [Line Items]  
Offshore vessels and equipment, field equipment and power 0
2028 | 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 13,380
North West Redwater Partnership service toll 4,985
Other $ 355
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 $ 193