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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) $ in Millions, $ in Millions | Feb. 22, 2024 USD ($) | Feb. 22, 2024 CAD ($) | Jun. 30, 2025 | May 16, 2025 CAD ($) | Nov. 29, 2024 USD ($) | Jun. 05, 2024 USD ($) | May 31, 2024 USD ($)
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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, 2055 | Floating interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings variable rate |  |  |  | 0.027 |  |  |
Subordinated notes maturing march |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 300 |  |
Subordinated notes maturing march | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 6.80% |  |
Subordinated notes, maturing may 24, 2081 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 8 | $ 150
Subordinated notes, maturing may 24, 2081 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 7.25% |
Medium-term notes, public - canadian - maturing february 22, 2024 |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Repayments of debt | $ 531 | $ 700 |  |  |  |  |
Medium-term notes, public - canadian - maturing february 22, 2024 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |
Borrowings, interest rate | 3.315% | 3.315% |  |  |  |  |

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