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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
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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

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