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Income Taxes (Summary of Reconciliation to Statutory Income Tax Rate) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Income Taxes [Abstract]    
Income taxes at Canadian statutory income tax rate $ 6,572 $ 3,009
Increase (decrease) resulting from:    
Dividends received (13) (28)
Rate differentials on international operations (3,037) (270)
Other - net (112) (20)
Provision for income taxes - Consolidated Statement of Income $ 3,410 $ 2,691
Income taxes at Canadian statutory income tax rate 27.80% 27.80%
Dividends received (0.10%) (0.30%)
Rate differentials on international operations (12.80%) (2.50%)
Other - net (0.50%) (0.20%)
Provision for income taxes and effective income tax rate 14.40% 24.80%