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BORROWINGS - Additional Information (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2024 USD ($) | Jun. 30, 2024 USD ($) extension | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) extension | Jun. 30, 2023 USD ($) | Jun. 05, 2024 USD ($) | May 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 27, 2023 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Proceeds from corporate credit facility |  | $ 1,043 | $ 1,268 | $ 2,134 | $ 3,057 |  |  |  |
Proceeds from corporate borrowings |  | 153 | 0 | 153 | 0 |  |  |  |
Corporate Revolving Credit Facility |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 2,200 |  | $ 2,200 |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  | 13 |  | 13 |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 865 |  | $ 865 |  |  |  | $ 222 |
Letter of credit outstanding amount |  | $ 8 |  | 8 |  |  |  | 8 |
Proceeds from corporate credit facility |  |  |  | $ 643 |  |  |  |  |
Corporate Revolving Credit Facility | Floating interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 1.20% |  | 1.20% |  |  |  |  |
Medium-term Notes, Maturing September 11, 2028 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 512 |  | $ 512 |  |  |  | 528 |
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 4.20% |  | 4.20% |  |  |  |  |
Revolving credit facility with Brookfield |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 1,000 |  | $ 1,000 |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  | 0 |
Borrowings, number of extensions | extension |  | 8 |  | 8 |  |  |  |  |
Borrowings, term of extension |  | 1 year |  | 1 year |  |  |  |  |
Borrowings, adjustment to interest rate basis |  | 1.90% |  | 1.90% |  |  |  |  |
Medium-term Notes, Maturing October 9, 2029 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 512 |  | $ 512 |  |  |  | 528 |
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 3.40% |  | 3.40% |  |  |  |  |
Subordinated Notes, Maturing May 24, 2081 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 250 |  | $ 250 |  |  |  | 250 |
Subordinated Notes, Maturing May 24, 2081 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.00% |  | 5.00% |  |  |  |  |
Medium-term Notes, Maturing April 25, 2034 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 292 |  | $ 292 |  |  |  | 302 |
Medium-term Notes, Maturing April 25, 2034 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.40% |  | 5.40% |  |  |  |  |
Medium-term Notes, Maturing September 1, 2032 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 366 |  | $ 366 |  |  |  | 377 |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 2.90% |  | 2.90% |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 986 |  | $ 986 |  |  |  | 989 |
Commercial Paper | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 6.00% |  | 6.00% |  |  |  |  |
Subordinated notes, Maturing May 24, 2081 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 8 | $ 150 |  |
Subordinated notes, Maturing May 24, 2081 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 7.25% |  |  |
Medium-term Notes, Maturing July 27, 2030 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 366 |  | $ 366 |  |  |  | 377 |
Notional amount |  |  |  |  |  |  |  |  | $ 700
Medium-term Notes, Maturing July 27, 2030 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.70% |  | 5.70% |  |  |  |  |
Medium-term Notes, Maturing July 27, 2030, Tranche One |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 500
Medium-term Notes, Maturing July 27, 2030, Tranche One | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 5.71%
Medium-term Notes, Maturing July 27, 2030, Tranche Two |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 200
Medium-term Notes, Maturing July 27, 2030, Tranche Two | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 5.95%
Medium-term Notes, Maturing November 14, 2027 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 329 |  | $ 329 |  |  |  | 340 |
Medium-term Notes, Maturing November 14, 2027 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.60% |  | 5.60% |  |  |  |  |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings |  | $ 0 |  | $ 0 |  |  |  | $ 226 |
Repayments of debt | $ 531 |  |  |  |  |  |  |  |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 3.30% |  | 3.30% |  |  |  |  |

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