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Leases - Additional Information (Details)
$ in Millions, $ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets   $ 1,108 $ 612 $ 728
Lease liabilities   1,061 571 $ 694
QBSA | Joint operations        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets   447    
Subsidiaries | TAK        
Disclosure of quantitative information about right-of-use assets [line items]        
Lease liabilities   85 $ 91  
Subsidiaries | QBSA        
Disclosure of quantitative information about right-of-use assets [line items]        
Lease liabilities   $ 428    
Lease liability, percentage 0.022 0.022    
Subsidiaries | Next 18 years, after year 1 | TAK        
Disclosure of quantitative information about right-of-use assets [line items]        
Lease liabilities annual payment $ 6      
Subsidiaries | Next 18 years, after year 1 | QBSA        
Disclosure of quantitative information about right-of-use assets [line items]        
Lease liabilities annual payment   $ 22