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Derivatives (Summary of Effect of Fair Value Hedges) (Details) - Interest rate risk [member] - Fair value hedges [member] - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about hedges [line items]    
Change in value of hedged items for ineffectiveness measurement, assets $ 4,164 $ 11,772
Change in value of hedged items for ineffectiveness measurement, liabilities (1,284) (2,504)
Change in value of hedged items for ineffectiveness measurement, net 2,880 9,268
Change in fair value of hedging instruments for ineffectiveness measurement, assets (4,165) (11,843)
Change in fair value of hedging instruments for ineffectiveness measurement, liabilities 1,282 2,478
Change in fair value of hedging instruments for ineffectiveness measurement, net (2,883) (9,365)
Hedge ineffectiveness, assets (1) (71)
Hege ineffectiveness, liabilities (2) (26)
Hedge ineffectiveness, net (3) (97)
Carrying amounts for hedged items, assets 237,865 219,341
Carrying amounts for hedged items, liabilities 176,735 135,542
Accumulated amount of fair value hedge adjustments on hedged items, assets (7,391) (12,409)
Accumulated amount of fair value hedge adjustments on hedged items, liabilities (624) (3,448)
Accumulated amount of fair value hedge adjustments on de-designated hedged items, assets (3,182) (3,082)
Accumulated amount of fair value hedge adjustments on de-designated hedged items, liabilities (27) (227)
Deposits [member]    
Disclosure of detailed information about hedges [line items]    
Change in value of hedged items for ineffectiveness measurement, liabilities (1,090) (2,291)
Change in fair value of hedging instruments for ineffectiveness measurement, liabilities 1,088 2,265
Hege ineffectiveness, liabilities (2) (26)
Carrying amounts for hedged items, liabilities 165,311 125,519
Accumulated amount of fair value hedge adjustments on hedged items, liabilities (875) (3,543)
Accumulated amount of fair value hedge adjustments on de-designated hedged items, liabilities 27 (136)
Securitization liabilities at amortized cost [member]    
Disclosure of detailed information about hedges [line items]    
Change in value of hedged items for ineffectiveness measurement, liabilities (141) (163)
Change in fair value of hedging instruments for ineffectiveness measurement, liabilities 141 163
Hege ineffectiveness, liabilities 0 0
Carrying amounts for hedged items, liabilities 8,599 6,865
Accumulated amount of fair value hedge adjustments on hedged items, liabilities 169 68
Accumulated amount of fair value hedge adjustments on de-designated hedged items, liabilities 0 0
Subordinated notes and debentures [member]    
Disclosure of detailed information about hedges [line items]    
Change in value of hedged items for ineffectiveness measurement, liabilities (53) (50)
Change in fair value of hedging instruments for ineffectiveness measurement, liabilities 53 50
Hege ineffectiveness, liabilities 0 0
Carrying amounts for hedged items, liabilities 2,825 3,158
Accumulated amount of fair value hedge adjustments on hedged items, liabilities 82 27
Accumulated amount of fair value hedge adjustments on de-designated hedged items, liabilities (54) (91)
Debt securities amortized cost [member]    
Disclosure of detailed information about hedges [line items]    
Change in value of hedged items for ineffectiveness measurement, assets 2,031 6,856
Change in fair value of hedging instruments for ineffectiveness measurement, assets (2,033) (6,899)
Hedge ineffectiveness, assets (2) (43)
Carrying amounts for hedged items, assets 112,729 113,323
Accumulated amount of fair value hedge adjustments on hedged items, assets (7,849) (10,995)
Accumulated amount of fair value hedge adjustments on de-designated hedged items, assets (3,195) (3,015)
Financial assets at fair value through other comprehensive income, category [member]    
Disclosure of detailed information about hedges [line items]    
Change in value of hedged items for ineffectiveness measurement, assets 1,616 3,127
Change in fair value of hedging instruments for ineffectiveness measurement, assets (1,618) (3,146)
Hedge ineffectiveness, assets (2) (19)
Carrying amounts for hedged items, assets 93,230 53,253
Accumulated amount of fair value hedge adjustments on hedged items, assets 472 (1,086)
Accumulated amount of fair value hedge adjustments on de-designated hedged items, assets 18 (71)
Loans [member]    
Disclosure of detailed information about hedges [line items]    
Change in value of hedged items for ineffectiveness measurement, assets 517 1,789
Change in fair value of hedging instruments for ineffectiveness measurement, assets (514) (1,798)
Hedge ineffectiveness, assets 3 (9)
Carrying amounts for hedged items, assets 31,906 52,765
Accumulated amount of fair value hedge adjustments on hedged items, assets (14) (328)
Accumulated amount of fair value hedge adjustments on de-designated hedged items, assets $ (5) $ 4