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BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 10, 2018 | Dec. 31, 2017 | Apr. 17, 2017 | Feb. 22, 2017
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Corporate revolving credit facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Non-recourse borrowings | $ 510 |  | $ 789 |  |
Corporate revolving credit facility | Floating interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, adjustment to interest rate basis | 1.20% |  |  |  |
Medium Term Notes, Maturing October 30, 2018 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Non-recourse borrowings | $ 0 |  | 99 |  |
Medium Term Notes, Maturing October 30, 2018 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Rate | 3.00% |  |  |  |
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Non-recourse borrowings | $ 275 |  | 298 |  |
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Rate | 3.50% |  |  |  |
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Non-recourse borrowings | $ 330 |  | 358 |  |
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] |  |  |  |  |
Non-recourse borrowings | $ 220 |  | 239 |  |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Rate | 3.30% |  |  | 3.30% | 3.30%
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Non-recourse borrowings | $ 293 |  | 318 |  |
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 [Domain] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Non-recourse borrowings | $ 365 |  | 0 |  |
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Rate | 4.20% | 4.20% |  |  |
Corporate borrowings |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Non-recourse borrowings | $ 1,993 |  | $ 2,101 |  |

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