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Income taxes - Reconciliation of Reported Income Taxes in the Income Statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]    
Net earnings (losses) $ 2,892 $ 2,473
Add back income taxes 1,044 792
Earnings from continuing operations before income taxes $ 3,936 $ 3,265
Applicable statutory tax rate 26.80% 26.90%
Income taxes computed at applicable statutory rates $ (1,055) $ (878)
Non-taxable portion of (losses) gains on investments (1) 1
Uncertain tax positions 16 21
Effect of change in provincial corporate tax rate 0 9
Change in estimate relating to prior periods 2 6
Non-taxable portion of equity (losses) gains (26) 2
Previously unrecognized tax benefits 15 47
Other 5 0
Total income taxes from continuing operations $ (1,044) $ (792)
Average effective tax rate 26.50% 24.30%