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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 ($)	Jan. 31, 2025 USD ($)
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
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-IssueDate 2024-01-01
-Paragraph 7
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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