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BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions | Dec. 31, 2021 | May 24, 2021 | Dec. 31, 2020 | Apr. 07, 2020 | Oct. 07, 2019
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Deferred financing costs and other | $ (20) |  | $ (15) |  |
Current and non-current portion of corporate borrowings | 2,719 |  | 3,158 |  |
Senior Unsecured Revolving Credit Facility - Maturing June 28, 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total | $ 0 |  | 1,131 |  |
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 February 22, 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total | $ 237 |  | 236 |  |
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 | $ 317 |  | 314 |  |
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 | $ 554 |  | 550 |  |
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 | $ 554 |  | 550 |  |
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 | $ 396 |  | 392 |  |
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual rate | 2.90% |  |  |  |
Subordinated notes, Maturing 2081 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual rate |  | 5.00% |  |  |
Total | $ 250 | $ 250 | 0 |  |
Subordinated notes, Maturing 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] |  |  |  |  |
Total | $ 2,739 |  | 3,173 |  |
Commercial Paper Program |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Total | $ 431 |  | $ 0 |  |
Commercial Paper Program | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual rate | 0.37% |  |  |  |

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