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IFRS 7 - Disclosure - Credit Risk - Summary of Credit Quality of Retail Portfolios (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | $ 1,095,621 | $ 1,022,941
Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 463,574 | 448,243
Real estate secured personal lending [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 336,599 | 329,968
Other retail [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 20,504 | 19,465
Internal Ratings Based [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 1,035,402 | 973,004
Internal Ratings Based [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 452,398 | 437,171
Internal Ratings Based [member] | Exceptionally Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 269,802 | 264,361
Internal Ratings Based [member] | Very Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 90,651 | 83,228
Internal Ratings Based [member] | Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 56,193 | 55,896
Internal Ratings Based [member] | Medium [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 29,095 | 28,540
Internal Ratings Based [member] | High [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 5,396 | 4,189
Internal Ratings Based [member] | Default [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 1,261 | 957
Internal Ratings Based [member] | Real estate secured personal lending [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 333,512 | 326,938
Internal Ratings Based [member] | Real estate secured personal lending [member] | Exceptionally Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 208,494 |
Internal Ratings Based [member] | Real estate secured personal lending [member] | Very Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 73,973 |
Internal Ratings Based [member] | Real estate secured personal lending [member] | Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 32,030 |
Internal Ratings Based [member] | Real estate secured personal lending [member] | Medium [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 16,695 |
Internal Ratings Based [member] | Real estate secured personal lending [member] | High [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 1,286 |
Internal Ratings Based [member] | Real estate secured personal lending [member] | Default [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 1,034 |
Internal Ratings Based [member] | Qualifying Revolving Retail [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 95,200 |
Internal Ratings Based [member] | Qualifying Revolving Retail [member] | Exceptionally Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 57,310 |
Internal Ratings Based [member] | Qualifying Revolving Retail [member] | Very Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 11,977 |
Internal Ratings Based [member] | Qualifying Revolving Retail [member] | Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 15,414 |
Internal Ratings Based [member] | Qualifying Revolving Retail [member] | Medium [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 7,840 |
Internal Ratings Based [member] | Qualifying Revolving Retail [member] | High [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 2,589 |
Internal Ratings Based [member] | Qualifying Revolving Retail [member] | Default [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 70 |
Internal Ratings Based [member] | Other retail [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 19,631 | $ 18,635
Internal Ratings Based [member] | Other retail [member] | Exceptionally Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 3,603 |
Internal Ratings Based [member] | Other retail [member] | Very Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 3,832 |
Internal Ratings Based [member] | Other retail [member] | Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 7,201 |
Internal Ratings Based [member] | Other retail [member] | Medium [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 3,570 |
Internal Ratings Based [member] | Other retail [member] | High [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 1,332 |
Internal Ratings Based [member] | Other retail [member] | Default [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 93 |
Internal Ratings Based [member] | SME retail [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 4,055 |
Internal Ratings Based [member] | SME retail [Member] | Exceptionally Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 395 |
Internal Ratings Based [member] | SME retail [Member] | Very Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 869 |
Internal Ratings Based [member] | SME retail [Member] | Low [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 1,548 |
Internal Ratings Based [member] | SME retail [Member] | Medium [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 990 |
Internal Ratings Based [member] | SME retail [Member] | High [Member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | 189 |
Internal Ratings Based [member] | SME retail [Member] | Default [member] | Retail portfolios [member] |  |
Disclosure of credit risk exposure [line items] |  |
Exposure to Credit Risk | $ 64 |

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2024-03-27 + Details
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