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Income taxes - Reconciliation of Reported Income Taxes in the Income Statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Net earnings (losses) $ 2,473 $ 3,224
Add back income taxes 792 1,129
Earnings from continuing operations before income taxes $ 3,265 $ 4,353
Applicable statutory tax rate 26.90% 27.00%
Income taxes computed at applicable statutory rates $ (878) $ (1,175)
Non-taxable portion of gains on investments 1 5
Uncertain tax positions 21 15
Effect of change in provincial corporate tax rate 9 25
Change in estimate relating to prior periods 6 14
Non-taxable portion of equity gains (losses) 2 (20)
Previously unrecognized tax benefits 47 5
Other 0 2
Total income taxes from continuing operations $ (792) $ (1,129)
Average effective tax rate 24.30% 25.90%