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Loans, Impaired Loans and Allowance for Credit Losses - Loans Maturities (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans | [1] | $ 778,508 | $ 767,365
Allowance for credit losses |  | (7,463) | (6,536)
Total loans net of allowance for credit losses |  | 771,045 | 760,829
Within one year [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 254,923 | 234,172
Total loans net of allowance for credit losses |  | 254,923 | 234,172
One to 5 years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 388,164 | 406,650
Total loans net of allowance for credit losses |  | 388,164 | 406,650
Five to ten years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 32,742 | 28,207
Total loans net of allowance for credit losses |  | 32,742 | 28,207
Over ten years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 27,612 | 26,840
Total loans net of allowance for credit losses |  | 27,612 | 26,840
No Stated Maturity [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 75,067 | 71,496
Allowance for credit losses |  | (7,463) | (6,536)
Total loans net of allowance for credit losses |  | 67,604 | 64,960
Residential mortgages [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 370,191 | 350,941
Allowance for credit losses |  | (1,460) | (1,208)
Total loans net of allowance for credit losses |  | 368,731 | 349,733
Residential mortgages [member] | Within one year [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 92,485 | 72,883
Residential mortgages [member] | One to 5 years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 228,818 | 233,469
Residential mortgages [member] | Five to ten years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 18,398 | 15,456
Residential mortgages [member] | Over ten years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 25,699 | 25,264
Residential mortgages [member] | No Stated Maturity [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 4,791 | 3,869
Personal loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 110,567 | 106,379
Allowance for credit losses |  | (2,432) | (2,319)
Total loans net of allowance for credit losses |  | 108,135 | 104,060
Personal loans [member] | Within one year [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 21,114 | 18,753
Personal loans [member] | One to 5 years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 37,982 | 37,707
Personal loans [member] | Five to ten years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 5,341 | 5,411
Personal loans [member] | Over ten years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 1,269 | 1,171
Personal loans [member] | No Stated Maturity [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 44,861 | 43,337
Credit cards [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 18,045 | 17,374
Allowance for credit losses |  | (1,355) | (1,160)
Total loans net of allowance for credit losses |  | 16,690 | 16,214
Credit cards [member] | No Stated Maturity [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 18,045 | 17,374
Business and government [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 279,705 | 292,671
Allowance for credit losses |  | (2,216) | (1,849)
Total loans net of allowance for credit losses |  | 277,489 | 290,822
Business and government [member] | Within one year [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 141,324 | 142,536
Business and government [member] | One to 5 years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 121,364 | 135,474
Business and government [member] | Five to ten years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 9,003 | 7,340
Business and government [member] | Over ten years [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 644 | 405
Business and government [member] | No Stated Maturity [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 7,370 | 6,916
Floating interest rate [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 367,518 | 357,750
Total loans net of allowance for credit losses |  | 367,518 | 357,750
Floating interest rate [member] | Residential mortgages [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 111,631 | 93,626
Floating interest rate [member] | Personal loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 50,887 | 47,790
Floating interest rate [member] | Business and government [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 205,000 | 216,334
Fixed interest rate [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 401,719 | 402,143
Total loans net of allowance for credit losses |  | 401,719 | 402,143
Fixed interest rate [member] | Residential mortgages [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 253,782 | 253,954
Fixed interest rate [member] | Personal loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 58,258 | 57,219
Fixed interest rate [member] | Credit cards [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 18,045 | 17,374
Fixed interest rate [member] | Business and government [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 71,634 | 73,596
Non-rate sensitive [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 9,271 | 7,472
Allowance for credit losses |  | (7,463) | (6,536)
Total loans net of allowance for credit losses |  | 1,808 | 936
Non-rate sensitive [member] | Residential mortgages [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 4,778 | 3,361
Non-rate sensitive [member] | Personal loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | 1,422 | 1,370
Non-rate sensitive [member] | Business and government [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans |  | $ 3,071 | $ 2,741
[1] | Geographic segmentation is based on the location of the property for residential mortgages; otherwise, the residence of the borrower.

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