v3.22.2.2
Income taxes - Reconciliation to Statutory Tax Rate (Detail) - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]    
Income taxes at Canadian statutory tax rate $ 5,269 $ 5,405
Increase (decrease) in income taxes resulting from    
Lower average tax rate applicable to subsidiaries (428) (361)
Tax-exempt income from securities (437) (379)
Tax rate change 4 (4)
Other (106) (80)
Income taxes (recoveries) $ 4,302 $ 4,581
Reconciliation of average effective tax rate    
Income taxes at Canadian statutory tax rate 26.20% 26.20%
Increase (decrease) in income taxes result from    
Lower average tax rate applicable to subsidiaries (2.10%) (1.80%)
Tax-exempt income from securities (2.20%) (1.80%)
Other (0.50%) (0.40%)
Income taxes in Consolidated Statements of Income / effective tax rate 21.40% 22.20%