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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) - CAD ($) $ in Millions	Jun. 30, 2026	Sep. 24, 2025	May 16, 2025
Medium-term notes, maturing january 6, 2031
Disclosure of information about consolidated structured entities [line items]
Notional amount		$ 700
Medium-term notes, maturing january 6, 2031 | Fixed interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate	3.70%	3.70%
Medium-term Notes, Maturing January 6, 2031 Tranche One
Disclosure of information about consolidated structured entities [line items]
Notional amount		$ 375
Borrowings, interest rate		3.70%
Medium-term Notes, Maturing January 6, 2031 Tranche Two
Disclosure of information about consolidated structured entities [line items]
Notional amount		$ 325
Borrowings, interest rate		4.526%
Subordinated notes, maturing september 1, 2055
Disclosure of information about consolidated structured entities [line items]
Notional amount			$ 250
Subordinated notes, maturing september 1, 2055 | Fixed interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings, interest rate	5.60%		5.60%
Subordinated Notes, Maturing September 1, 2030, | Floating interest rate
Disclosure of information about consolidated structured entities [line items]
Borrowings variable rate			0.027

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+ References

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- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2025-01-01
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
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-IssueDate 2025-01-01
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-URIDate 2025-03-27

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