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Commitments and Contingencies - Future Payments for Commitments (Details) - CAD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage $ 20,231  
Product Purchases 1,172  
Real estate 856  
Obligation to fund equity-accounted affiliate 558  
Other long term commitments 1,873  
Total Commitments 24,690  
Commitments approved and not yet in service    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage $ 9,100 $ 9,100
Minimum    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation commitments subject to regulatory approval or approved but not yet in service term 20 years  
Remainder of Year    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage $ 432  
Product Purchases 393  
Real estate 15  
Obligation to fund equity-accounted affiliate 25  
Other long term commitments 284  
Total Commitments 1,149  
2 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 1,958  
Product Purchases 779  
Real estate 53  
Obligation to fund equity-accounted affiliate 105  
Other long term commitments 185  
Total Commitments 3,080  
3 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 1,717  
Product Purchases 0  
Real estate 54  
Obligation to fund equity-accounted affiliate 96  
Other long term commitments 163  
Total Commitments 2,030  
4 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 1,453  
Product Purchases 0  
Real estate 56  
Obligation to fund equity-accounted affiliate 96  
Other long term commitments 151  
Total Commitments 1,756  
5 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 1,408  
Product Purchases 0  
Real estate 59  
Obligation to fund equity-accounted affiliate 91  
Other long term commitments 142  
Total Commitments 1,700  
Thereafter    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 13,263  
Product Purchases 0  
Real estate 619  
Obligation to fund equity-accounted affiliate 145  
Other long term commitments 948  
Total Commitments $ 14,975