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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Assets $ 73,485 $ 71,940
Publicly-traded and privately-held investments    
Disclosure of financial assets [line items]    
Assets 877 587
Publicly-traded and privately-held investments | Quoted prices in active markets for identical assets (level 1)    
Disclosure of financial assets [line items]    
Assets 35 10
Publicly-traded and privately-held investments | Observable market data (level 2)    
Disclosure of financial assets [line items]    
Assets 0 0
Publicly-traded and privately-held investments | Non-observable market inputs (level 3)    
Disclosure of financial assets [line items]    
Assets 842 577
Derivative financial instruments | Derivative financial instruments    
Disclosure of financial assets [line items]    
Assets (liabilities) (368) (488)
Derivative financial instruments | Derivative financial instruments | Quoted prices in active markets for identical assets (level 1)    
Disclosure of financial assets [line items]    
Assets (liabilities) 0 0
Derivative financial instruments | Derivative financial instruments | Observable market data (level 2)    
Disclosure of financial assets [line items]    
Assets (liabilities) (368) (488)
Derivative financial instruments | Derivative financial instruments | Non-observable market inputs (level 3)    
Disclosure of financial assets [line items]    
Assets (liabilities) 0 0
Other    
Disclosure of financial assets [line items]    
Assets (liabilities) 225  
Other | Quoted prices in active markets for identical assets (level 1)    
Disclosure of financial assets [line items]    
Assets (liabilities) 0  
Other | Observable market data (level 2)    
Disclosure of financial assets [line items]    
Assets (liabilities) 225  
Other | Non-observable market inputs (level 3)    
Disclosure of financial assets [line items]    
Assets (liabilities) $ 0  
Other | Other    
Disclosure of financial assets [line items]    
Assets (liabilities)   147
Other | Other | Quoted prices in active markets for identical assets (level 1)    
Disclosure of financial assets [line items]    
Assets (liabilities)   0
Other | Other | Observable market data (level 2)    
Disclosure of financial assets [line items]    
Assets (liabilities)   216
Other | Other | Non-observable market inputs (level 3)    
Disclosure of financial assets [line items]    
Assets (liabilities)   $ (69)