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Contingent Liabilities and Provisions - Additional Information (Detail) $ in Millions |  |  |  | 25 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 15, 2018 | Dec. 31, 2016 USD ($) | Sep. 30, 2016 CAD ($) | Apr. 30, 2018 USD ($) | Oct. 31, 2025 CAD ($) | Oct. 31, 2025 USD ($) | Jul. 31, 2025 CAD ($) | Jun. 30, 2025 CAD ($) | Oct. 31, 2024 CAD ($) | Mar. 31, 2013 CAD ($)
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Damage settlement |  |  |  |  |  |  |  | $ 2,000,000,000 |  |
York Countyv Rambo Class Actions [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Underwriting offering |  | $ 650 |  | $ 4,000 |  |  |  |  |  |
Underwriting offering, percentage |  | 6.00% |  |  |  |  |  |  |  |
York Countyv Rambo Class Actions [member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Underwriting offering |  | $ 400 |  |  |  |  |  |  |  |
York Countyv Rambo Class Actions [member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Underwriting offering |  | $ 250 |  |  |  |  |  |  |  |
Restructuring provision [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring provision |  |  |  |  | $ 0 |  |  |  | $ 8,000,000 |
Legal proceedings contingent liability [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  | 0 |  |  |  |  |
Legal proceedings contingent liability [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  | $ 400,000,000 |  |  |  |  |
The RRSP of J.T.G v. His Majesty The King [Member] | Part 1 tax [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Income Tax Assessment Payable |  |  |  |  |  |  |  |  |  | $ 139,000,000
The RRSP of J.T.G v. His Majesty The King [Member] | Part XI.1 tax [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Income Tax Reassessment Payable |  |  |  |  |  |  |  |  |  | $ 144,000,000
Salko v. CIBC Investor Services Inc. et al [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Punitive damages as a percentage of the total sum of fees charged to class members | 5.00% |  |  |  |  |  |  |  |  |
Vaillancourt and Thivierge v. Bank of Montreal, et al [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, punitive damage |  |  | $ 300 |  |  |  |  |  |  |
Quantum Biopharma LTD [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Damages payable subject to approval |  |  |  |  |  | $ 700 |  |  |  |
Pozgaj [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Legal settlements payable |  |  |  |  |  |  | $ 26,000,000 |  |  |
Woodard [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Contingent Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Legal settlements payable |  |  |  |  |  |  | $ 11,000,000 |  |  |

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