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Commitments and Contingencies - Future Payments for Commitments (Details) - CAD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage $ 33,177  
Real Estate 861  
Obligation to Fund Equity-Accounted Affiliate 622  
Other Long-Term Commitments 2,281  
Total Payments 36,941  
Commitments approved and not yet in service    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage $ 9,100 $ 8,100
Minimum    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Lease terms 20 years  
Remainder of Year    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage $ 1,928  
Real Estate 23  
Obligation to Fund Equity-Accounted Affiliate 38  
Other Long-Term Commitments 366  
Total Payments 2,355  
2 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 3,598  
Real Estate 45  
Obligation to Fund Equity-Accounted Affiliate 87  
Other Long-Term Commitments 181  
Total Payments 3,911  
3 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 3,663  
Real Estate 51  
Obligation to Fund Equity-Accounted Affiliate 100  
Other Long-Term Commitments 159  
Total Payments 3,973  
4 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 2,543  
Real Estate 54  
Obligation to Fund Equity-Accounted Affiliate 92  
Other Long-Term Commitments 145  
Total Payments 2,834  
5 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 2,439  
Real Estate 56  
Obligation to Fund Equity-Accounted Affiliate 92  
Other Long-Term Commitments 161  
Total Payments 2,748  
Thereafter    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 19,006  
Real Estate 632  
Obligation to Fund Equity-Accounted Affiliate 213  
Other Long-Term Commitments 1,269  
Total Payments $ 21,120