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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) - CAD ($) $ in Millions | Jun. 30, 2026 | Sep. 24, 2025 | May 16, 2025
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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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