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Share capital (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of classes of share capital [line items]          
Payments to acquire or redeem entity's shares   $ 51 $ 71 $ 157 $ 162
Series AO Convertible Preference Shares          
Disclosure of classes of share capital [line items]          
Shares redeemed (in shares) 4,600,000        
Value of shares $ 118        
Payments to acquire or redeem entity's shares 115        
Reduction of issued capital $ 3