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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, 2023
Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments $ (95) $ (101)
ESP    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments (29) (28)
RSUs/PSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments (62) (69)
DSUs and stock options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments $ (4) $ (4)