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BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Corporate Revolving Credit Facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 577 | $ 96
Corporate Revolving Credit Facility | Floating interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 1.20% |
Commercial Paper |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 941 | 464
Commercial Paper | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 6.00% |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 227 | 222
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 3.30% |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 302 | 295
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 3.30% |
Medium-term Notes, Maturing September 11, 2028 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 529 | 517
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 4.20% |
Medium-term Notes, Maturing October 9, 2029 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 529 | 517
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 3.40% |
Medium-term Notes, Maturing September 1, 2032 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 378 | 369
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 2.90% |
Medium-term Notes, Maturing April 25, 2034 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 302 | 295
Medium-term Notes, Maturing April 25, 2034 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 5.40% |
Medium-term Notes, Maturing April 25, 2052 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 150 | 147
Medium-term Notes, Maturing April 25, 2052 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 5.80% |
Subordinated Notes, Maturing May 24, 2081 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 250 | 250
Subordinated Notes, Maturing May 24, 2081 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 5.00% |
Corporate Borrowings |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 4,691 | 3,666
Corporate borrowings, outstanding principal | 4,714 | 3,689
Corporate borrowings, deferred financing costs and other | (23) | (23)
Medium-term Notes, Maturing February 14, 2033 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 189 | 185
Medium-term Notes, Maturing February 14, 2033 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 6.00% |
Medium-term Notes, Maturing November 14, 2027 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 340 | $ 332
Medium-term Notes, Maturing November 14, 2027 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual rate | 5.60% |

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