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Commitments and Contingencies - Additional Information (Details) - CAD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage $ 24,371  
Total commitments 27,241  
Outstanding letters of credit $ 338 $ 355
Minimum    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation commitments subject to regulatory approval or approved but not yet in service term 15 years  
Commitments approved and not yet in service    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage $ 1,500  
HMLP    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Total commitments $ 1,700