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Income Taxes - Summary of Effective Tax Rates (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Statement [Line Items]    
Combined Canadian federal and provincial income taxes at the statutory tax rate $ 3,211 $ 2,651
Tax-exempt income from securities (36) (45)
Foreign operations subject to different tax rates [1] (264) (365)
Change in tax rate for deferred taxes 7 3
Income attributable to investments in associates and joint ventures (51) (36)
Other (42)  
Provision for income taxes in our Consolidated Statement of Income and effective tax rate $ 2,825 $ 2,208
Combined Canadian federal and provincial income taxes at the statutory tax rate 27.80% 27.80%
Tax-exempt income from securities (0.30%) (0.50%)
Foreign operations subject to different tax rates [1] (2.30%) (3.80%)
Change in tax rate for deferred taxes 0.10%  
Income attributable to investments in associates and joint ventures (0.40%) (0.30%)
Other (0.40%)  
Provision for income taxes in our Consolidated Statement of Income and effective tax rate 24.50% 23.20%
[1] Global minimum tax rules became effective this fiscal year, and as a result, our effective tax rate increased by approximately 55 basis points for the year ended October 31, 2025.