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Share-based payments - Share-based Payment Amounts Included in the Income Statements as Operating Costs (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments $ (84) $ (95)
RSUs and PSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments (52) (62)
ESP and DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments $ (32) $ (33)