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Corporate Income Taxes - Reconciliation of Statutory Rate (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Reconciliation of average effective tax rate and applicable tax rate [abstract]    
Income taxes at Canadian statutory rate $ 2,919 $ 2,755
Lower average tax rate applicable to subsidiaries and foreign branches [1] (177) (746)
Tax-exempt income from securities   (28)
Other, net 9 51
Total income taxes and effective tax rate $ 2,751 $ 2,032
Income taxes at Canadian statutory rate 27.80% 27.80%
Lower average tax rate applicable to subsidiaries and foreign branches [1] (1.70%) (7.50%)
Tax-exempt income from securities   (0.30%)
Other, net 0.10% 0.50%
Total income taxes and effective tax rate 26.20% 20.50%
[1] Lower average tax rate applicable to subsidiaries and foreign branches includes the impact of the GMT which increased the effective tax rate by 0.8%.