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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