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Insurance (Summary of Sensitivity Analysis for Actuarial Assumptions) (Details) - Property liability and casualty insurance segment [member] - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Impact of one percent change in discount rate in key assumptions [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Increase in assumption $ 135 $ 121
Decrease in assumption (143) (129)
Increase in assumption 100 90
Decrease in assumption (107) (95)
Impact of five percent changes in frequency of claims in key assumptions [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Increase in assumption (202) (182)
Decrease in assumption 202 182
Increase in assumption (150) (135)
Decrease in assumption 150 135
Impact of five percent change in severity of claims in key assumptions [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Increase in assumption (289) (288)
Decrease in assumption 289 288
Increase in assumption (215) (213)
Decrease in assumption 215 213
Impact of five percent change in risk adjustment in key assumptions [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Increase in assumption (39) (52)
Decrease in assumption 34 40
Increase in assumption (29) (38)
Decrease in assumption $ 25 $ 29