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Derivative Financial Instruments - Summary of Items designated as Hedging Instruments, Hedged Items and Ineffectiveness for Fair Value Hedges for Cash Flow Hedges and Net Investment Hedges (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets $ 9,290 $ 8,722
Carrying amount of the hedging instruments, Liabilities 15,370 (18,583)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income 2,567 5,357
Gains/(losses) on hedged item used to calculate hedge ineffectiveness 2,576 5,323
Ineffectiveness recorded in non-interest income-other (9) 46
Cash flow hedges [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets 9,244 8,312
Carrying amount of the hedging instruments, Liabilities (8,243) (10,757)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income 3,928 5,241
Gains/(losses) on hedged item used to calculate hedge ineffectiveness 3,936 5,207
Ineffectiveness recorded in non-interest income-other (9) 46
Cash flow hedges [member] | Interest rate risk [member] | Swaps [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets 1,969 1,865
Carrying amount of the hedging instruments, Liabilities (3,746) (4,699)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income 171 1,775
Gains/(losses) on hedged item used to calculate hedge ineffectiveness 169 1,774
Ineffectiveness recorded in non-interest income-other (5) 29
Cash flow hedges [member] | Currency or interest rate risk [member] | Swaps [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets 200 245
Carrying amount of the hedging instruments, Liabilities (1,949) (2,407)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income 173 1,363
Gains/(losses) on hedged item used to calculate hedge ineffectiveness 166 1,369
Ineffectiveness recorded in non-interest income-other 5 7
Cash flow hedges [member] | Foreign currency risk [member] | Swaps [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets 6,904 6,090
Carrying amount of the hedging instruments, Liabilities (2,541) (3,650)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income 3,242 1,826
Gains/(losses) on hedged item used to calculate hedge ineffectiveness 3,259 1,787
Ineffectiveness recorded in non-interest income-other (9) 10
Cash flow hedges [member] | Foreign currency risk [member] | Foreign currency forward contracts [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Liabilities (7)  
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income (3) 5
Gains/(losses) on hedged item used to calculate hedge ineffectiveness (3) 5
Cash flow hedges [member] | Foreign currency risk [member] | Cash [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets 92 74
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income (12) 9
Gains/(losses) on hedged item used to calculate hedge ineffectiveness (12) 9
Cash flow hedges [member] | Equity price risk return swap [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets 79 38
Carrying amount of the hedging instruments, Liabilities   (1)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income 357 263
Gains/(losses) on hedged item used to calculate hedge ineffectiveness 357 263
Net investment hedges [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets 46 410
Carrying amount of the hedging instruments, Liabilities (7,127) (7,826)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income (1,361) 116
Gains/(losses) on hedged item used to calculate hedge ineffectiveness (1,360) 116
Net investment hedges [member] | Foreign currency risk [member] | Deposit liabilities - carrying amount [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Liabilities (6,287) (7,571)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income (67) (62)
Gains/(losses) on hedged item used to calculate hedge ineffectiveness (66) (62)
Net investment hedges [member] | Foreign currency risk [member] | Foreign currency forward contracts [member]    
Disclosure of detailed information about hedged items and hedging instruments [line items]    
Carrying amount of the hedging instruments, Assets 46 410
Carrying amount of the hedging instruments, Liabilities (840) (255)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income (1,294) 178
Gains/(losses) on hedged item used to calculate hedge ineffectiveness $ (1,294) $ 178