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Securities - Summary of Residual Term to Contractual Maturity of Financial Instruments (Parenthetical) (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI $ 88,905 $ 76,693
Securities measured at amortized cost 65,471 71,610
Securities issued 283,235 254,345
Denominated in US Dollars [member]    
Disclosure of financial assets [line items]    
Securities issued 139,900 126,700
Denominated in other foreign currencies [member]    
Disclosure of financial assets [line items]    
Securities issued 17,300 12,400
Financial assets at fair value [member]    
Disclosure of financial assets [line items]    
Securities issued 283,173 253,437
Mortgage backed securities [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI 3,709 3,470
Canada mortgage and housing corporation securities [member] | Mortgage backed securities [member]    
Disclosure of financial assets [line items]    
Securities issued 5,608 3,977
Securities measured at amortized cost [member] | Insured By CMHC [member] | Mortgage backed securities [member] | Amortized cost [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Securities measured at amortized cost 2,632 2,585
Securities measured at amortized cost [member] | Insured By CMHC [member] | Mortgage backed securities [member] | Financial assets at fair value [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Securities measured at amortized cost 2,634 2,582
Securities measured at amortized cost [member] | Issued by Federal national mortgage association Securities [member] | Mortgage backed securities [member] | Amortized cost [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Securities measured at amortized cost 198 471
Securities measured at amortized cost [member] | Issued by Federal national mortgage association Securities [member] | Mortgage backed securities [member] | Financial assets at fair value [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Securities measured at amortized cost 189 448
Securities measured at amortized cost [member] | Issued by Federal home loan mortgage corporation Securities [member] | Mortgage backed securities [member] | Amortized cost [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Securities measured at amortized cost 1,009 1,536
Securities measured at amortized cost [member] | Issued by Federal home loan mortgage corporation Securities [member] | Mortgage backed securities [member] | Financial assets at fair value [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Securities measured at amortized cost 968 1,450
Securities measured at amortized cost [member] | Issued by government national mortgage association Securities [member] | Mortgage backed securities [member] | Amortized cost [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Securities measured at amortized cost 156 123
Securities measured at amortized cost [member] | Issued by government national mortgage association Securities [member] | Mortgage backed securities [member] | Financial assets at fair value [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Securities measured at amortized cost 155 118
Debt securities designated at FVOCI [member] | Insured By CMHC [member] | Mortgage backed securities [member] | Amortized cost [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI 3,177 2,832
Debt securities designated at FVOCI [member] | Insured By CMHC [member] | Mortgage backed securities [member] | Financial assets at fair value [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI 3,180 2,827
Debt securities designated at FVOCI [member] | Issued by Federal national mortgage association Securities [member] | Mortgage backed securities [member] | Amortized cost [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI 222 284
Debt securities designated at FVOCI [member] | Issued by Federal national mortgage association Securities [member] | Mortgage backed securities [member] | Financial assets at fair value [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI 217 275
Debt securities designated at FVOCI [member] | Issued by Federal home loan mortgage corporation Securities [member] | Mortgage backed securities [member] | Amortized cost [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI 78 103
Debt securities designated at FVOCI [member] | Issued by Federal home loan mortgage corporation Securities [member] | Mortgage backed securities [member] | Financial assets at fair value [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI 76 99
Debt securities designated at FVOCI [member] | Issued by government national mortgage association Securities [member] | Mortgage backed securities [member] | Amortized cost [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI 239 274
Debt securities designated at FVOCI [member] | Issued by government national mortgage association Securities [member] | Mortgage backed securities [member] | Financial assets at fair value [member] | IFRS9 [member]    
Disclosure of financial assets [line items]    
Debt securities measured at FVOCI $ 236 $ 269