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Share-based payments - Schedule of Share-based Payments (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Total share-based payments $ (19) $ (16) $ (60) $ (53)
Restricted share units (RSUs) and performance share units (PSUs)        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Total share-based payments (11) (9) (37) (38)
Stock options, employee savings plan and deferred share units        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Total share-based payments $ (8) $ (7) $ (23) $ (15)