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Fair Value Measurements and Trading-Related Revenue - Summary of Fair Value Measurement of Assets And Liabilities (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | $ 192,303 | $ 168,926
FVTPL Securities | 21,354 | 19,064
FVOCI Securities | 113,209 | 93,702
Deposits | 56,162 | 54,108
Derivative Assets |  |
Derivative Assets | 57,151 | 47,253
Derivative Liabilities |  |
Derivative Liabilities | 58,729 | 58,303
Measured at fair value [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 192,303 | 168,926
FVTPL Securities | 21,354 | 19,064
FVOCI Securities | 113,209 | 93,702
Loans | 13,324 | 12,655
Other Assets | 10,004 | 12,953
Fair value liabilities | 145,276 | 110,002
Deposits | 56,162 | 54,108
Securities sold but not yet purchased | 54,876 | 35,030
Other liabilities | 34,238 | 20,864
Derivative Assets |  |
Derivative Assets | 57,151 | 47,253
Derivative Liabilities |  |
Derivative Liabilities | 58,729 | 58,303
Measured at fair value [member] | Canadian federal government [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 12,311 | 10,036
FVTPL Securities | 1,619 | 403
FVOCI Securities | 45,335 | 34,177
Measured at fair value [member] | Canadian provincial and municipal governments [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 9,035 | 7,585
FVTPL Securities | 1,578 | 1,578
FVOCI Securities | 5,644 | 5,996
Measured at fair value [member] | U.S. federal government [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 30,902 | 24,248
FVTPL Securities | 1,495 | 1,527
FVOCI Securities | 20,809 | 16,965
Measured at fair value [member] | US States, municipalities and agencies [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 1,144 | 565
FVOCI Securities | 5,634 | 5,068
Measured at fair value [member] | Other governments [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 4,126 | 3,849
FVTPL Securities |  | 25
FVOCI Securities | 4,065 | 5,656
Measured at fair value [member] | NHA MBS, and U.S. agency MBS and CMO [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 56,450 | 40,995
FVTPL Securities | 18 | 21
FVOCI Securities | 27,015 | 21,293
Measured at fair value [member] | Corporate debt [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 11,614 | 10,172
FVTPL Securities | 8,908 | 8,780
FVOCI Securities | 4,515 | 4,370
Measured at fair value [member] | Trading loans [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 4,568 | 5,493
Measured at fair value [member] | Corporate equity [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 62,153 | 65,983
FVTPL Securities | 7,736 | 6,730
FVOCI Securities | 192 | 177
Measured at fair value [member] | Residential mortgages [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Loans | 79 | 163
Measured at fair value [member] | Business and government loans [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Loans | 13,245 | 12,492
Measured at fair value [member] | Interest rate contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 8,681 | 9,887
Derivative Liabilities |  |
Derivative Liabilities | 10,099 | 10,843
Measured at fair value [member] | Foreign exchange contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 30,519 | 21,272
Derivative Liabilities |  |
Derivative Liabilities | 26,049 | 19,955
Measured at fair value [member] | Commodity contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 1,462 | 1,827
Derivative Liabilities |  |
Derivative Liabilities | 1,608 | 1,821
Measured at fair value [member] | Equity contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 16,488 | 14,257
Derivative Liabilities |  |
Derivative Liabilities | 20,973 | 25,673
Measured at fair value [member] | Credit default swaps [member] |  |
Derivative Assets |  |
Derivative Assets | 1 | 10
Derivative Liabilities |  |
Derivative Liabilities |  | 11
Valued using quoted market prices [member] | Measured at fair value [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 65,759 | 69,611
FVTPL Securities | 1,146 | 1,087
FVOCI Securities | 1,211 | 3,237
Other Assets | 8,521 | 11,236
Fair value liabilities | 17,140 | 12,385
Securities sold but not yet purchased | 14,998 | 10,631
Other liabilities | 2,142 | 1,754
Derivative Assets |  |
Derivative Assets | 558 | 748
Derivative Liabilities |  |
Derivative Liabilities | 389 | 203
Valued using quoted market prices [member] | Measured at fair value [member] | Canadian federal government [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 757 | 1,272
FVTPL Securities | 56 | 166
FVOCI Securities | 1,158 | 3,212
Valued using quoted market prices [member] | Measured at fair value [member] | U.S. federal government [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 3,308 | 2,688
FVOCI Securities | 16 | 25
Valued using quoted market prices [member] | Measured at fair value [member] | Other governments [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 199 | 92
FVOCI Securities | 37 |
Valued using quoted market prices [member] | Measured at fair value [member] | Corporate equity [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 61,495 | 65,559
FVTPL Securities | 1,090 | 921
Valued using quoted market prices [member] | Measured at fair value [member] | Interest rate contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 15 | 36
Derivative Liabilities |  |
Derivative Liabilities | 18 | 32
Valued using quoted market prices [member] | Measured at fair value [member] | Foreign exchange contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 43 | 4
Valued using quoted market prices [member] | Measured at fair value [member] | Commodity contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 225 | 169
Derivative Liabilities |  |
Derivative Liabilities | 196 | 96
Valued using quoted market prices [member] | Measured at fair value [member] | Equity contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 275 | 539
Derivative Liabilities |  |
Derivative Liabilities | 175 | 75
Valued using models (with observable inputs) [member] | Measured at fair value [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 126,544 | 99,311
FVTPL Securities | 14,384 | 13,043
FVOCI Securities | 111,806 | 90,288
Loans | 13,000 | 12,353
Other Assets | 0 | 0
Fair value liabilities | 128,136 | 97,617
Deposits | 56,162 | 54,108
Securities sold but not yet purchased | 39,878 | 24,399
Other liabilities | 32,096 | 19,110
Derivative Assets |  |
Derivative Assets | 56,568 | 46,493
Derivative Liabilities |  |
Derivative Liabilities | 58,335 | 58,093
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Canadian federal government [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 11,554 | 8,764
FVTPL Securities | 1,563 | 237
FVOCI Securities | 44,177 | 30,965
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Canadian provincial and municipal governments [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 9,035 | 7,585
FVTPL Securities | 1,578 | 1,578
FVOCI Securities | 5,644 | 5,996
Valued using models (with observable inputs) [member] | Measured at fair value [member] | U.S. federal government [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 27,594 | 21,560
FVTPL Securities | 1,495 | 1,527
FVOCI Securities | 20,793 | 16,940
Valued using models (with observable inputs) [member] | Measured at fair value [member] | US States, municipalities and agencies [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 1,144 | 565
FVOCI Securities | 5,634 | 5,068
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Other governments [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 3,927 | 3,757
FVTPL Securities |  | 25
FVOCI Securities | 4,028 | 5,656
Valued using models (with observable inputs) [member] | Measured at fair value [member] | NHA MBS, and U.S. agency MBS and CMO [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 56,450 | 40,995
FVTPL Securities | 18 | 21
FVOCI Securities | 27,015 | 21,293
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Corporate debt [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 11,614 | 10,172
FVTPL Securities | 8,908 | 8,745
FVOCI Securities | 4,515 | 4,370
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Trading loans [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 4,568 | 5,493
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Corporate equity [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities | 658 | 420
FVTPL Securities | 822 | 910
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Residential mortgages [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Loans | 79 | 163
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Business and government loans [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Loans | 12,921 | 12,190
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Interest rate contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 8,666 | 9,851
Derivative Liabilities |  |
Derivative Liabilities | 10,081 | 10,811
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Foreign exchange contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 30,474 | 21,258
Derivative Liabilities |  |
Derivative Liabilities | 26,049 | 19,955
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Commodity contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 1,224 | 1,656
Derivative Liabilities |  |
Derivative Liabilities | 1,412 | 1,721
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Equity contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 16,203 | 13,718
Derivative Liabilities |  |
Derivative Liabilities | 20,793 | 25,596
Valued using models (with observable inputs) [member] | Measured at fair value [member] | Credit default swaps [member] |  |
Derivative Assets |  |
Derivative Assets | 1 | 10
Derivative Liabilities |  |
Derivative Liabilities |  | 10
Valued using models (without observable inputs) [member] | Measured at fair value [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities |  | 4
FVTPL Securities | 5,824 | 4,934
FVOCI Securities | 192 | 177
Loans | 324 | 302
Other Assets | 1,483 | 1,717
Derivative Assets |  |
Derivative Assets | 25 | 12
Derivative Liabilities |  |
Derivative Liabilities | 5 | 7
Valued using models (without observable inputs) [member] | Measured at fair value [member] | Corporate debt [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
FVTPL Securities |  | 35
Valued using models (without observable inputs) [member] | Measured at fair value [member] | Corporate equity [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Trading Securities |  | 4
FVTPL Securities | 5,824 | 4,899
FVOCI Securities | 192 | 177
Valued using models (without observable inputs) [member] | Measured at fair value [member] | Business and government loans [member] |  |
Disclosure Of Fair Value Of Financial Instruments [line items] |  |
Loans | 324 | 302
Valued using models (without observable inputs) [member] | Measured at fair value [member] | Foreign exchange contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 2 | 10
Valued using models (without observable inputs) [member] | Measured at fair value [member] | Commodity contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 13 | 2
Derivative Liabilities |  |
Derivative Liabilities |  | 4
Valued using models (without observable inputs) [member] | Measured at fair value [member] | Equity contracts [member] |  |
Derivative Assets |  |
Derivative Assets | 10 |
Derivative Liabilities |  |
Derivative Liabilities | $ 5 | 2
Valued using models (without observable inputs) [member] | Measured at fair value [member] | Credit default swaps [member] |  |
Derivative Liabilities |  |
Derivative Liabilities |  | $ 1

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