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Income taxes - Reconciliation of Reported Income Taxes in the Income Statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Abstract]    
Net earnings (losses) $ 2,926 $ 2,892
Add back income taxes 967 1,044
Earnings before income taxes $ 3,893 $ 3,936
Applicable statutory tax rate 26.80% 26.80%
Income taxes computed at applicable statutory rates $ (1,043) $ (1,055)
Non-taxable portion of gains (losses) on investments 4 (1)
Uncertain tax positions 91 16
Change in estimate relating to prior periods 0 2
Non-taxable portion of equity losses (18) (26)
Previously unrecognized tax benefits 0 15
Other (1) 5
Total income taxes $ (967) $ (1,044)
Average effective tax rate 24.80% 26.50%