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BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Apr. 07, 2020 | Dec. 31, 2019 | Oct. 07, 2019
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Deferred financing costs and other | $ (15) |  | $ 0 |
Corporate borrowings | 3,158 |  | 2,475 |
Senior Unsecured Revolving Credit Facility - Maturing June 28, 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total | $ 1,131 |  | 820 |
Senior Unsecured Revolving Credit Facility - Maturing June 28, 2024 | Floating interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, adjustment to interest rate basis | 1.20% |  |  |
Borrowings, adjustment to interest rate basis | 1.20% |  |  |
Senior Unsecured Revolving Credit Facility - Maturing April 14, 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total | $ 0 |  | 0 |
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total | $ 0 |  | 346 |
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 3.50% |  |  |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total | $ 236 |  | 231 |
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] |  |  |  |
Total | $ 314 |  | 308 |
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] |  |  |  |
Total | $ 550 |  | 384 |
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] |  |  |  |
Annual Rate |  | 3.40% |  | 3.50%
Total | $ 550 |  | 386 |
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] |  |  |  |
Total | $ 392 |  | 0 |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 2.90% |  |  |
Corporate borrowings |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total | $ 3,173 |  | $ 2,475 |

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