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Income taxes - Reconciliation of Reported Income Taxes in the Income Statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Abstract]    
Net earnings (losses) $ 2,327 $ 2,926
Add back income taxes 996 967
Earnings before income taxes $ 3,323 $ 3,893
Applicable statutory tax rate 26.80% 26.80%
Income taxes computed at applicable statutory rates $ (891) $ (1,043)
Non-taxable portion of gains on investments 5 4
Uncertain tax positions 16 91
Change in estimate relating to prior periods 10 0
Non-taxable portion of equity losses (149) (18)
Other 13 (1)
Total income taxes $ (996) $ (967)
Average effective tax rate 30.00% 24.80%