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BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions | Jun. 30, 2024 | May 31, 2024 | Feb. 22, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Corporate Revolving Credit Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 865 |  |  | $ 222
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 | $ 986 |  |  | 989
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 | $ 0 |  |  | 226
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 | $ 0 |  |  | 302
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual rate | 3.30% |  | 3.315% |
Medium-term Notes, Maturing November 14, 2027 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 329 |  |  | 340
Medium-term Notes, Maturing November 14, 2027 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual rate | 5.60% |  |  |
Medium-term Notes, Maturing September 11, 2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 512 |  |  | 528
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 | $ 512 |  |  | 528
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 July 27, 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 366 |  |  | 377
Medium-term Notes, Maturing July 27, 2030 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual rate | 5.70% |  |  |
Medium-term Notes, Maturing September 1, 2032 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 366 |  |  | 377
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 February 14, 2033 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 183 |  |  | 189
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 April 25, 2034 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 292 |  |  | 302
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 | $ 146 |  |  | 151
Medium-term Notes, Maturing April 25, 2052 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual rate | 5.80% |  |  |
Medium-term Notes, Maturing July 27, 2053 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 146 |  |  | 151
Medium-term Notes, Maturing July 27, 2053 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual rate | 6.00% |  |  |
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% |  |  |
Medium-term Notes, Maturing May 31, 2084 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 158 | $ 158 |  | 0
Medium-term Notes, Maturing May 31, 2084 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual rate |  | 7.30% |  |
Corporate Borrowings |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | 5,084 |  |  | 4,911
Corporate borrowings, outstanding principal | 5,111 |  |  | 4,932
Corporate borrowings, deferred financing costs and other | $ (27) |  |  | $ (21)

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