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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2020 | Mar. 30, 2020 | Dec. 31, 2019
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Disclosure of financial assets [line items] |  |  |
Carrying Value | $ 613 |  | $ 623
Fair Value | 613 |  | 623
Disclosure of financial liabilities [line items] |  |  |
Carrying Value | 7,234 |  | 5,021
Fair Value | 7,480 |  | 5,172
Preferred Shares |  | $ 25.00 |
Accounts payable and other (current and non-current) |  |  |
Disclosure of financial liabilities [line items] |  |  |
Carrying Value | 505 |  | 487
Fair Value | 505 |  | 487
Non-recourse borrowings (current and non-current)(1) |  |  |
Disclosure of financial liabilities [line items] |  |  |
Carrying Value | 3,477 |  | 3,526
Fair Value | 3,723 |  | 3,677
Exchangeable and class B shares(2) |  |  |
Disclosure of financial liabilities [line items] |  |  |
Carrying Value | 2,221 |  | 0
Fair Value | 2,221 |  | 0
Financial liabilities (current and non-current)(1) |  |  |
Disclosure of financial liabilities [line items] |  |  |
Carrying Value | 1,031 |  | 1,008
Fair Value | 1,031 |  | 1,008
Class C Shares |  |  |
Disclosure of financial liabilities [line items] |  |  |
Fair Value | 69 |  |
Cash and cash equivalents |  |  |
Disclosure of financial assets [line items] |  |  |
Carrying Value | 192 |  | 204
Fair Value | 192 |  | 204
Accounts receivable and other |  |  |
Disclosure of financial assets [line items] |  |  |
Carrying Value | 394 |  | 390
Fair Value | 394 |  | 390
Financial assets (current and non-current)(1) |  |  |
Disclosure of financial assets [line items] |  |  |
Carrying Value | 27 |  | 29
Fair Value | $ 27 |  | $ 29

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