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Structured Entities - Consolidated Structured Entities - Additional Information (Detail) $ in Millions, $ in Millions | Oct. 31, 2025 CAD ($) | Oct. 31, 2025 USD ($) | Oct. 31, 2024 CAD ($) | Oct. 31, 2024 USD ($)
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Disclosure of information about consolidated structured entities [line items] |  |  |  |
Assets pledged | $ 308,176 |  | $ 255,401 |
Auto loan receivables securitization trust outstanding | 423 | $ 301 | 0 |
Guarantee-linked notes [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Debt instruments issued | 1,697 |  | 1,002 |
Loans and receivables, category [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Assets pledged | 4,488 |  | 0 |
Scotiabank covered bond guarantor limited partnership [member] | Deposits From Business And Government [Member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Covered bond outstanding | 46,700 |  | 47,000 |
Scotiabank covered bond guarantor limited partnership [member] | Guarantee-linked notes [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Debt instruments issued | 8,400 |  | 5,500 |
Scotiabank covered bond guarantor limited partnership [member] | Uninsured residential mortgage backed securities [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Assets pledged | 44,800 |  | 48,000 |
Halifax receivables trust [member] | Unsecured personal line of credit receivables [member] | Deposits From Business And Government [Member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Assets pledged | 274 | 196 | 291 | $ 209
Subordinated notes outstanding | 3,200 | $ 2,300 | 3,300 | $ 2,400
Trillium credit card trust II [member] | Credit card receivable [member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Assets pledged | 3,600 |  | 3,800 |
U.S. multi-seller conduit [Member] | Business and government loans [Member] |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Assets recognized in entity's financial statements in relation to consolidated structured entities | $ 14,000 |  | $ 11,000 |

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