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Share-based payments - Share-Based Payment Amounts Included in the Income Statements as Operating Costs (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Total share-based payments $ (16) $ (18) $ (53) $ (52)
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 (9) (10) (38) (35)
Employee savings plan and deferred share units        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Total share-based payments $ (7) $ (8) $ (15) $ (17)