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Concentration of Credit Risk - Summary of Credit Exposure Associated with our On- and Off-Balance Sheet Financial Instruments (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of credit risk exposure [line items] |  |
Credit exposure | $ 1,095,621 | $ 1,022,941
Credit risk [member] | On-balance sheet [member] | Major assets [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 1,063,486 | 997,885
Credit risk [member] | Off-balance sheet [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 480,883 | 440,411
Credit risk [member] | Off-balance sheet [member] | Financial institutions counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 92,426 | 84,172
Credit risk [member] | Off-balance sheet [member] | Governments counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 11,277 | 11,081
Credit risk [member] | Off-balance sheet [member] | Retail Counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 213,223 | 200,974
Credit risk [member] | Off-balance sheet [member] | Corporate counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 163,957 | 144,184
Canada [member] | Credit risk [member] | On-balance sheet [member] | Major assets [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 657,015 | 627,621
Canada [member] | Credit risk [member] | Off-balance sheet [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 355,800 | 337,448
Canada [member] | Credit risk [member] | Off-balance sheet [member] | Financial institutions counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 48,031 | 46,567
Canada [member] | Credit risk [member] | Off-balance sheet [member] | Governments counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 11,022 | 10,913
Canada [member] | Credit risk [member] | Off-balance sheet [member] | Retail Counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 211,289 | 199,324
Canada [member] | Credit risk [member] | Off-balance sheet [member] | Corporate counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 85,458 | 80,644
United States [member] | Credit risk [member] | On-balance sheet [member] | Major assets [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 288,069 | 259,280
United States [member] | Credit risk [member] | Off-balance sheet [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 98,170 | 82,355
United States [member] | Credit risk [member] | Off-balance sheet [member] | Financial institutions counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 36,436 | 31,083
United States [member] | Credit risk [member] | Off-balance sheet [member] | Governments counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 129 | 153
United States [member] | Credit risk [member] | Off-balance sheet [member] | Retail Counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 1,250 | 1,125
United States [member] | Credit risk [member] | Off-balance sheet [member] | Corporate counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 60,355 | 49,994
Other countries [member] | Credit risk [member] | On-balance sheet [member] | Major assets [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 118,402 | 110,984
Other countries [member] | Credit risk [member] | Off-balance sheet [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 26,913 | 20,608
Other countries [member] | Credit risk [member] | Off-balance sheet [member] | Financial institutions counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 7,959 | 6,522
Other countries [member] | Credit risk [member] | Off-balance sheet [member] | Governments counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 126 | 15
Other countries [member] | Credit risk [member] | Off-balance sheet [member] | Retail Counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | 684 | 525
Other countries [member] | Credit risk [member] | Off-balance sheet [member] | Corporate counterparty [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit exposure | $ 18,144 | $ 13,546

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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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