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Derivative Instruments - Schedule of Derivative-Related Credit Risk (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
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.