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Financial assets and liabilities - Equity Price Exposures (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Disclosure of detailed information about hedging instruments [line items]          
Net gains (losses) on change in fair value of derivatives $ (62) $ (43) $ (29) $ (42)  
Equity price risk          
Disclosure of detailed information about hedging instruments [line items]          
Net gains (losses) on change in fair value of derivatives $ (62) $ (43) $ (29) $ (42)  
Percentage of possible change in risk variable 5.00%   5.00%    
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact in net earnings $ 15   $ 15    
Forward contract | Equity price risk          
Disclosure of detailed information about hedging instruments [line items]          
Hedging instrument, liabilities $ 219   $ 219   $ 187