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BORROWINGS - Additional Information (Details) $ in Millions, $ in Millions |  | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2024 USD ($) | Feb. 22, 2024 CAD ($) | Jun. 30, 2025 USD ($) | Jun. 05, 2025 USD ($) | May 16, 2025 CAD ($) | Mar. 16, 2025 CAD ($) | Dec. 31, 2024 USD ($) | Nov. 29, 2024 USD ($) | May 31, 2024 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Commercial paper |  |  | $ 295 |  |  |  |  |  |
Corporate revolving credit facility |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | $ 2,200 |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  | 0.0013 |  |  |  |  |  |
Subsidiary and corporate borrowings |  |  | $ 113 |  |  |  | $ 300 |  |
Letter of credit outstanding amount |  |  | 10 |  |  |  | 10 |  |
Line of credit amount drawn |  |  | $ 187 |  |  |  |  |  |
Corporate revolving credit facility | Floating interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 1.30% |  |  |  |  |  |
Subordinated notes, maturing september 1, 2055 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  |  | $ 184 |  |  | $ 250 | 0 |  |
Notional amount |  |  |  |  | $ 250 |  |  |  |
Subordinated notes, maturing september 1, 2055 | Floating interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings variable rate |  |  |  |  | 0.027 |  |  |  |
Subordinated notes, maturing september 1, 2055 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.60% |  | 5.60% |  |  |  |
Subordinated notes maturing march |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  |  |  |  |  |  |  | $ 300 |
Notional amount |  |  |  |  |  |  |  | $ 300 |
Subordinated notes maturing march | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 6.80% |
Subordinated notes, maturing may 31, 2084 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  |  | $ 158 | $ 158 |  |  | 158 |  | $ 158
Subordinated notes, maturing may 31, 2084 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 7.30% |  |  |  |  | 7.30%
Medium-term notes, public - canadian - maturing february 22, 2024 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Repayments of debt | $ 531 | $ 700 |  |  |  |  |  |  |
Medium-term notes, public - canadian - maturing february 22, 2024 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 3.315% | 3.315% |  |  |  |  |  |  |
Revolving credit facility with brookfield |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | 1,000 |  |  |  |  |  |
Subsidiary and corporate borrowings |  |  | $ 0 |  |  |  | $ 0 |  |
Borrowing renewal term |  |  | 1 year |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  | 1.90% |  |  |  |  |  |
Subordinate notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  | $ 184 |  |  |  |  |  |

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