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Derivative Instruments - Schedule of Derivative-Related Credit Risk (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost | [1] | $ 10,676 |  | $ 10,129
Derivative credit risk equivalents | [1] | 52,325 |  | 46,577
Derivative credit risk weighted assets |  | 9,442 |  | 7,819
Interest rate contract [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 2,762 |  | 3,228
Derivative credit risk equivalents before master netting agreements | [1] | 12,313 |  | 11,341
Derivative credit risk weighted assets before master netting agreements |  | 2,878 |  | 1,997
Interest rate contract [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 2,749 |  | 3,098
Derivative credit risk equivalents before master netting agreements | [1] | 12,252 |  | 11,042
Derivative credit risk weighted assets before master netting agreements |  | 2,877 |  | 1,991
Interest rate contract [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 13 |  | 130
Derivative credit risk equivalents before master netting agreements | [1] | 61 |  | 299
Derivative credit risk weighted assets before master netting agreements |  | 1 |  | 6
Interest rate contract [member] | Written put options [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements |  | 8 | [1] | 2
Derivative credit risk equivalents before master netting agreements |  | 245 | [1] | 211
Derivative credit risk weighted assets before master netting agreements |  | 66 |  | 78
Interest rate contract [member] | Written put options [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 2 |  |
Derivative credit risk equivalents before master netting agreements | [1] | 5 |  | 1
Interest rate contract [member] | Futures contract [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 9 |  | 122
Derivative credit risk equivalents before master netting agreements | [1] | 49 |  | 279
Derivative credit risk weighted assets before master netting agreements |  | 1 |  | 6
Interest rate contract [member] | Swap contract [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 1,839 |  | 2,404
Derivative credit risk equivalents before master netting agreements | [1] | 7,493 |  | 7,797
Derivative credit risk weighted assets before master netting agreements |  | 1,501 |  | 1,125
Interest rate contract [member] | Forward rate agreements [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 391 |  | 650
Derivative credit risk equivalents before master netting agreements | [1] | 3,448 |  | 2,696
Derivative credit risk weighted assets before master netting agreements |  | 858 |  | 600
Interest rate contract [member] | Purchased options [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 511 |  | 42
Derivative credit risk equivalents before master netting agreements | [1] | 1,066 |  | 338
Derivative credit risk weighted assets before master netting agreements |  | 452 |  | 188
Interest rate contract [member] | Purchased options [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 2 |  | 8
Derivative credit risk equivalents before master netting agreements | [1] | 7 |  | 19
Foreign exchange contracts [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 3,885 |  | 4,411
Derivative credit risk equivalents before master netting agreements | [1] | 18,440 |  | 17,431
Derivative credit risk weighted assets before master netting agreements |  | 2,628 |  | 2,758
Foreign exchange contracts [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 3,885 |  | 4,411
Derivative credit risk equivalents before master netting agreements | [1] | 18,437 |  | 17,427
Derivative credit risk weighted assets before master netting agreements |  | 2,628 |  | 2,758
Foreign exchange contracts [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative credit risk equivalents before master netting agreements | [1] | 3 |  | 4
Foreign exchange contracts [member] | Written put options [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 1 |  | 1
Derivative credit risk equivalents before master netting agreements | [1] | 155 |  | 119
Derivative credit risk weighted assets before master netting agreements |  | 38 |  | 27
Foreign exchange contracts [member] | Futures contract [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative credit risk equivalents before master netting agreements | [1] | 1 |  | 1
Foreign exchange contracts [member] | Swap contract [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 1,927 |  | 1,559
Derivative credit risk equivalents before master netting agreements | [1] | 8,407 |  | 7,218
Derivative credit risk weighted assets before master netting agreements |  | 779 |  | 825
Foreign exchange contracts [member] | Forward rate agreements [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 1,838 |  | 2,709
Derivative credit risk equivalents before master netting agreements | [1] | 9,399 |  | 9,643
Derivative credit risk weighted assets before master netting agreements |  | 1,672 |  | 1,764
Foreign exchange contracts [member] | Purchased options [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 119 |  | 142
Derivative credit risk equivalents before master netting agreements | [1] | 476 |  | 447
Derivative credit risk weighted assets before master netting agreements |  | 139 |  | 142
Foreign exchange contracts [member] | Purchased options [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative credit risk equivalents before master netting agreements | [1] | 2 |  | 3
Commodity contract [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 1,663 |  | 1,513
Derivative credit risk equivalents before master netting agreements | [1] | 7,239 |  | 5,972
Derivative credit risk weighted assets before master netting agreements |  | 1,704 |  | 1,322
Commodity contract [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 1,374 |  | 1,158
Derivative credit risk equivalents before master netting agreements | [1] | 5,876 |  | 4,986
Derivative credit risk weighted assets before master netting agreements |  | 1,676 |  | 1,303
Commodity contract [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 289 |  | 355
Derivative credit risk equivalents before master netting agreements | [1] | 1,363 |  | 986
Derivative credit risk weighted assets before master netting agreements |  | 28 |  | 19
Commodity contract [member] | Written put options [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements |  | 4 | [1] | 10
Derivative credit risk equivalents before master netting agreements |  | 366 | [1] | 246
Derivative credit risk weighted assets before master netting agreements |  | 140 |  | 86
Commodity contract [member] | Written put options [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 15 |  |
Derivative credit risk equivalents before master netting agreements | [1] | 157 |  | 73
Derivative credit risk weighted assets before master netting agreements |  | 3 |  | 1
Commodity contract [member] | Futures contract [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 246 |  | 176
Derivative credit risk equivalents before master netting agreements | [1] | 1,028 |  | 594
Derivative credit risk weighted assets before master netting agreements |  | 21 |  | 12
Commodity contract [member] | Swap contract [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 1,165 |  | 993
Derivative credit risk equivalents before master netting agreements | [1] | 4,822 |  | 4,256
Derivative credit risk weighted assets before master netting agreements |  | 1,228 |  | 1,035
Commodity contract [member] | Purchased options [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 205 |  | 155
Derivative credit risk equivalents before master netting agreements | [1] | 688 |  | 484
Derivative credit risk weighted assets before master netting agreements |  | 308 |  | 182
Commodity contract [member] | Purchased options [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 28 |  | 179
Derivative credit risk equivalents before master netting agreements | [1] | 178 |  | 319
Derivative credit risk weighted assets before master netting agreements |  | 4 |  | 6
Equity contract [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 2,342 |  | 874
Derivative credit risk equivalents before master netting agreements | [1] | 14,156 |  | 11,524
Derivative credit risk weighted assets before master netting agreements |  | 2,210 |  | 1,703
Equity contract [member] | Over the Counter1 [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 306 |  | 199
Derivative credit risk equivalents before master netting agreements | [1] | 10,247 |  | 8,625
Derivative credit risk weighted assets before master netting agreements |  | 2,132 |  | 1,645
Equity contract [member] | Exchange Traded [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 2,036 |  | 675
Derivative credit risk equivalents before master netting agreements | [1] | 3,909 |  | 2,899
Derivative credit risk weighted assets before master netting agreements |  | 78 |  | 58
Credit Contracts [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Derivative replacement cost before master netting agreements | [1] | 24 |  | 103
Derivative credit risk equivalents before master netting agreements | [1] | 177 |  | 309
Derivative credit risk weighted assets before master netting agreements |  | $ 22 |  | $ 39
[1] | Replacement cost and credit risk equivalent are presented after the impact of master netting agreements and calculated using the Standardized Approach for Counterparty Credit Risk (SA-CCR) in accordance with the CAR Guideline issued by OSFI. The table therefore excludes loan commitment derivatives.

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