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Commitments and Contingencies - Summary of Future Payments of Commitments (Detail) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of commitments [Line Items]    
Transportation and Storage $ 21,397 $ 21,499
Real Estate 797 852
Capital Commitments 3  
Other Long-Term Commitments 322 354
Total Payments 22,519 22,705
1 Year [member]    
Disclosure of commitments [Line Items]    
Transportation and Storage 1,014 1,005
Real Estate 34 35
Capital Commitments 1  
Other Long-Term Commitments 104 104
Total Payments 1,153 1,144
2 Years [member]    
Disclosure of commitments [Line Items]    
Transportation and Storage 954 959
Real Estate 36 36
Capital Commitments 2  
Other Long-Term Commitments 45 44
Total Payments 1,037 1,039
3 Years [Member]    
Disclosure of commitments [Line Items]    
Transportation and Storage 1,341 1,026
Real Estate 38 38
Other Long-Term Commitments 32 36
Total Payments 1,411 1,100
4 Years [member]    
Disclosure of commitments [Line Items]    
Transportation and Storage 1,444 1,456
Real Estate 41 39
Other Long-Term Commitments 32 34
Total Payments 1,517 1,529
5 Years [Member]    
Disclosure of commitments [Line Items]    
Transportation and Storage 1,107 1,381
Real Estate 44 42
Other Long-Term Commitments 24 28
Total Payments 1,175 1,451
Thereafter [Member]    
Disclosure of commitments [Line Items]    
Transportation and Storage 15,537 15,672
Real Estate 604 662
Other Long-Term Commitments 85 108
Total Payments $ 16,226 $ 16,442