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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, 2021
Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments $ (95) $ (91)
ESP    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments (30) (31)
RSUs/PSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments (59) (51)
Other    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total share-based payments $ (6) $ (9)