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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Total share-based payments $ (29) $ (22) $ (63) $ (52)
Employee savings plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Total share-based payments (6) (8) (14) (16)
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 (21) (13) (46) (33)
Other        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Total share-based payments $ (2) $ (1) $ (3) $ (3)