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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) $ in Millions, $ in Millions | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Nov. 14, 2022 CAD ($) | Apr. 25, 2022 CAD ($) | May 24, 2021 USD ($)
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Medium-term Notes, Maturing April 25, 2034 |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Notional amount |  |  |  | $ 600 |
Subsidiary and corporate borrowings | $ 302 | $ 295 |  |  |
Medium-term Notes, Maturing April 25, 2034 Tranche One |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Notional amount |  |  |  | 400 |
Medium-term Notes, Maturing April 25, 2034 Tranche Two |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Notional amount |  |  |  | $ 200 |
Subordinated notes, Maturing May 24, 2081 |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 5.00%
Subsidiary and corporate borrowings |  |  |  |  | $ 250
Medium-term Notes, Maturing November 14, 2027 |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Notional amount |  |  | $ 700 |  |
Subsidiary and corporate borrowings | $ 340 | $ 332 |  |  |
Medium-term Notes, Maturing November 14, 2027 Tranche One |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Notional amount |  |  | 450 |  |
Medium-term Notes, Maturing November 14, 2027 Tranche Two |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Notional amount |  |  | $ 250 |  |
Fixed interest rate | Medium-term Notes, Maturing April 25, 2034 |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Borrowings, interest rate | 5.40% |  |  |  |
Fixed interest rate | Medium-term Notes, Maturing April 25, 2034 Tranche One |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Borrowings, interest rate |  |  |  | 5.439% |
Fixed interest rate | Medium-term Notes, Maturing April 25, 2034 Tranche Two |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Borrowings, interest rate |  |  |  | 5.789% |
Fixed interest rate | Medium-term Notes, Maturing November 14, 2027 |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Borrowings, interest rate | 5.60% |  |  |  |
Fixed interest rate | Medium-term Notes, Maturing November 14, 2027 Tranche One |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Borrowings, interest rate |  |  | 5.616% |  |
Fixed interest rate | Medium-term Notes, Maturing November 14, 2027 Tranche Two |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |
Borrowings, interest rate |  |  | 5.98% |  |

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