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Derivatives (Summary of Effect of Cash Flow and Net Investment Hedges) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of detailed information about hedges [line items] |  |
Amount reclassified from accumulated otther comprehensive income (loss) to earnings, net investment hedges | $ 799 | $ 41
Cash flow hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Change in value of hedged items for ineffectiveness measurement | (8,589) | (5,409)
Change in fair value of hedging instruments for ineffectiveness measurement | 8,603 | 5,414
Hedge ineffectiveness | 14 | 5
Hedging gains (losses) recognized in other comprehensive income | 7,840 | 3,356
Amount reclassified from accumulated otther comprehensive income (loss) to earnings, cash flow hedges | 4,858 | (173)
Net change in other comprehensive income (loss), cash flow hedges | 2,982 | 3,529
Cash flow hedges [member] | Interest rate risk [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Change in value of hedged items for ineffectiveness measurement | (1,859) | (3,602)
Change in fair value of hedging instruments for ineffectiveness measurement | 1,860 | 3,606
Hedge ineffectiveness | 1 | 4
Hedging gains (losses) recognized in other comprehensive income | 1,619 | 2,128
Amount reclassified from accumulated otther comprehensive income (loss) to earnings, cash flow hedges | (1,048) | (2,311)
Net change in other comprehensive income (loss), cash flow hedges | 2,667 | 4,439
Cash flow hedges [member] | Currency risk [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Change in value of hedged items for ineffectiveness measurement | (5,199) | (1,863)
Change in fair value of hedging instruments for ineffectiveness measurement | 5,201 | 1,867
Hedge ineffectiveness | 2 | 4
Hedging gains (losses) recognized in other comprehensive income | 4,679 | 1,287
Amount reclassified from accumulated otther comprehensive income (loss) to earnings, cash flow hedges | 4,559 | 2,204
Net change in other comprehensive income (loss), cash flow hedges | 120 | (917)
Cash flow hedges [member] | Equity price risk [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Change in value of hedged items for ineffectiveness measurement | (1,531) | 56
Change in fair value of hedging instruments for ineffectiveness measurement | 1,542 | (59)
Hedge ineffectiveness | 11 | (3)
Hedging gains (losses) recognized in other comprehensive income | 1,542 | (59)
Amount reclassified from accumulated otther comprehensive income (loss) to earnings, cash flow hedges | 1,347 | (66)
Net change in other comprehensive income (loss), cash flow hedges | 195 | 7
Hedges of net investment in foreign operations [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Change in value of hedged items for ineffectiveness measurement | 1,088 | 457
Change in fair value of hedging instruments for ineffectiveness measurement | (1,088) | (457)
Hedge ineffectiveness | 0 | 0
Hedging gains (losses) recognized in other comprehensive income | (1,088) | (457)
Amount reclassified from accumulated otther comprehensive income (loss) to earnings, net investment hedges | (799) | (41)
Net change in other comprehensive income (loss), net investment hedges | $ (289) | $ (416)

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