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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

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