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Financial assets and liabilities - Financial Instruments Measured at Fair Value (Details) - CAD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure of financial assets [line items]    
Other non-current assets $ 81,042 $ 80,165
Publicly-traded and privately-held investments    
Disclosure of financial assets [line items]    
Other non-current assets 352 1,198
Publicly-traded and privately-held investments | Quoted prices in active markets for identical assets (level 1)    
Disclosure of financial assets [line items]    
Other non-current assets 184 105
Publicly-traded and privately-held investments | OBSERVABLE MARKET DATA (LEVEL 2)    
Disclosure of financial assets [line items]    
Other non-current assets 0 0
Publicly-traded and privately-held investments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Other non-current assets 168 1,093
Derivative financial instruments | Derivative financial instruments    
Disclosure of financial assets [line items]    
Other current assets, trade payables and other liabilities, other non-current assets and liabilities (268) (513)
Derivative financial instruments | Derivative financial instruments | Quoted prices in active markets for identical assets (level 1)    
Disclosure of financial assets [line items]    
Other current assets, trade payables and other liabilities, other non-current assets and liabilities 0 0
Derivative financial instruments | Derivative financial instruments | OBSERVABLE MARKET DATA (LEVEL 2)    
Disclosure of financial assets [line items]    
Other current assets, trade payables and other liabilities, other non-current assets and liabilities (268) (513)
Derivative financial instruments | Derivative financial instruments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Other current assets, trade payables and other liabilities, other non-current assets and liabilities 0 0
Investments | Investments    
Disclosure of financial assets [line items]    
Other current assets, trade payables and other liabilities, other non-current assets and liabilities 247 246
Investments | Investments | Quoted prices in active markets for identical assets (level 1)    
Disclosure of financial assets [line items]    
Other current assets, trade payables and other liabilities, other non-current assets and liabilities 0 0
Investments | Investments | OBSERVABLE MARKET DATA (LEVEL 2)    
Disclosure of financial assets [line items]    
Other current assets, trade payables and other liabilities, other non-current assets and liabilities 247 246
Investments | Investments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Other current assets, trade payables and other liabilities, other non-current assets and liabilities $ 0 $ 0