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Subordinated indebtedness - Additional Information (Detail) $ in Millions, $ in Millions | Jul. 21, 2025 CAD ($) | Apr. 02, 2025 CAD ($) | Feb. 28, 2025 USD ($) | Jan. 31, 2025 USD ($)
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July 21 2025 [member] |  |  |  |
Disclosure Of Subordinated Indebtedness [Line Items] |  |  |  |
Borrowings maturity | July 21, 2030 |  |  |
Borrowings redemption price percentage of principal amount redeemed | 100.00% |  |  |
Borrowings, interest rate | 2.01% |  |  |
Repayments of subordinated liabilities | $ 1,000 |  |  |
Floating interest rate [member] | 2085 [Member] |  |  |  |
Disclosure Of Subordinated Indebtedness [Line Items] |  |  |  |
Borrowings maturity |  |  | 2085 |
Repayments of subordinated liabilities |  |  | $ 10 |
Floating interest rate [member] | 2084 [Member] |  |  |  |
Disclosure Of Subordinated Indebtedness [Line Items] |  |  |  |
Borrowings maturity |  |  |  | 2084
Repayments of subordinated liabilities |  |  |  | $ 38
Four Point One Three Debentures [Member] | Fixed interest rate [member] | April 2, 2035 [Member] |  |  |  |
Disclosure Of Subordinated Indebtedness [Line Items] |  |  |  |
Borrowings maturity |  | April 2, 2035 |  |
Borrowings, interest rate |  | 4.15% |  |
Notes and debentures issued |  | $ 1,250 |  |
April 2, 2035 [Member] | Four Point One Three Debentures [Member] | Compounded Canadian Overnight Repo Rate Average [Member] | April 2, 2035 [Member] |  |  |  |
Disclosure Of Subordinated Indebtedness [Line Items] |  |  |  |
Borrowings, interest rate |  | 1.72% |  |
April 2, 2030 [Member] | Four Point One Three Debentures [Member] | Fixed interest rate [member] | April 2, 2035 [Member] |  |  |  |
Disclosure Of Subordinated Indebtedness [Line Items] |  |  |  |
Borrowings, interest rate |  | 4.15% |  |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of notes and debentures issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The cash outflow for repayments of subordinated liabilities. [Refer: Subordinated liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
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