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Trading Assets - Summary of Analysis of Carrying Value of Trading Securities (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of financial assets [line items] |  |
Total trading securities | $ 140,844 | $ 119,912
Canadian federal government issued or guaranteed debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 15,801 | 14,971
Canadian provincial and municipal debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 11,710 | 8,413
U.S. treasury and other U.S. agency debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 9,132 | 15,050
Other foreign government debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 10,288 | 10,354
Equity securities [Member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 83,797 | 59,190
Other trading securities [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 10,116 | 11,934
Canadian dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 56,224 | 54,915
U.S. dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 60,782 | 46,750
Mexico, Pesos [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 4,693 | 4,776
Other currencies [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 19,145 | 13,471
Within 3 months [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 3,974 | 4,770
Within 3 months [member] | Canadian federal government issued or guaranteed debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 357 | 352
Within 3 months [member] | Canadian provincial and municipal debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,410 | 920
Within 3 months [member] | U.S. treasury and other U.S. agency debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 807 | 1,724
Within 3 months [member] | Other foreign government debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 670 | 1,458
Within 3 months [member] | Other trading securities [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 730 | 316
Within 3 months [member] | Canadian dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 2,328 | 1,570
Within 3 months [member] | U.S. dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 920 | 1,604
Within 3 months [member] | Mexico, Pesos [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 408 | 704
Within 3 months [member] | Other currencies [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 318 | 892
Three to 12 months [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 9,801 | 11,109
Three to 12 months [member] | Canadian federal government issued or guaranteed debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 2,143 | 1,646
Three to 12 months [member] | Canadian provincial and municipal debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,545 | 893
Three to 12 months [member] | U.S. treasury and other U.S. agency debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,628 | 2,439
Three to 12 months [member] | Other foreign government debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 3,441 | 3,663
Three to 12 months [member] | Other trading securities [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,044 | 2,468
Three to 12 months [member] | Canadian dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 4,115 | 3,452
Three to 12 months [member] | U.S. dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 2,339 | 3,643
Three to 12 months [member] | Mexico, Pesos [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,915 | 1,714
Three to 12 months [member] | Other currencies [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,432 | 2,300
One to 5 years [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 23,102 | 24,868
One to 5 years [member] | Canadian federal government issued or guaranteed debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 7,102 | 6,182
One to 5 years [member] | Canadian provincial and municipal debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 2,101 | 1,774
One to 5 years [member] | U.S. treasury and other U.S. agency debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 3,961 | 7,237
One to 5 years [member] | Other foreign government debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 4,347 | 3,883
One to 5 years [member] | Other trading securities [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 5,591 | 5,792
One to 5 years [member] | Canadian dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 11,627 | 9,779
One to 5 years [member] | U.S. dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 8,266 | 10,711
One to 5 years [member] | Mexico, Pesos [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,976 | 2,135
One to 5 years [member] | Other currencies [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,233 | 2,243
Five to ten years [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 10,758 | 10,798
Five to ten years [member] | Canadian federal government issued or guaranteed debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 3,606 | 3,626
Five to ten years [member] | Canadian provincial and municipal debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,856 | 937
Five to ten years [member] | U.S. treasury and other U.S. agency debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,871 | 2,461
Five to ten years [member] | Other foreign government debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,406 | 1,046
Five to ten years [member] | Other trading securities [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 2,019 | 2,728
Five to ten years [member] | Canadian dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 6,147 | 5,029
Five to ten years [member] | U.S. dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 3,711 | 4,426
Five to ten years [member] | Mexico, Pesos [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 157 | 101
Five to ten years [member] | Other currencies [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 743 | 1,242
Over ten years [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 9,412 | 9,170
Over ten years [member] | Canadian federal government issued or guaranteed debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 2,593 | 3,165
Over ten years [member] | Canadian provincial and municipal debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 4,798 | 3,889
Over ten years [member] | U.S. treasury and other U.S. agency debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 865 | 1,189
Over ten years [member] | Other foreign government debt [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 424 | 304
Over ten years [member] | Other trading securities [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 732 | 623
Over ten years [member] | Canadian dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 7,889 | 7,397
Over ten years [member] | U.S. dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 1,125 | 1,570
Over ten years [member] | Mexico, Pesos [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 161 | 63
Over ten years [member] | Other currencies [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 237 | 140
No specific maturity [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 83,797 | 59,197
No specific maturity [member] | Equity securities [Member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 83,797 | 59,190
No specific maturity [member] | Other trading securities [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities |  | 7
No specific maturity [member] | Canadian dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 24,118 | 27,688
No specific maturity [member] | U.S. dollar [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 44,421 | 24,796
No specific maturity [member] | Mexico, Pesos [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | 76 | 59
No specific maturity [member] | Other currencies [member] |  |
Disclosure of financial assets [line items] |  |
Total trading securities | $ 15,182 | $ 6,654

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