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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of financial assets [line items] |  |
Financial assets | $ 613 | $ 623
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 7,234 | 5,021
Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 69 | 77
Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 7,165 | 4,944
Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 27 | 29
Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 586 | 594
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 505 | 487
Accounts payable and other | Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Accounts payable and other | Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 505 | 487
Non-recourse borrowings (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,477 | 3,526
Non-recourse borrowings (current and non-current) | Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Non-recourse borrowings (current and non-current) | Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,477 | 3,526
Exchangeable and class B shares(2) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,221 | 0
Exchangeable and class B shares(2) | Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 |
Exchangeable and class B shares(2) | Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,221 |
Financial liabilities (current and non-current)(1) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 1,031 | 1,008
Financial liabilities (current and non-current)(1) | Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 69 | 77
Financial liabilities (current and non-current)(1) | Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 962 | 931
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 192 | 204
Cash and cash equivalents | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Cash and cash equivalents | Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 192 | 204
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets | 394 | 390
Accounts receivable and other | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Accounts receivable and other | Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 394 | 390
Financial assets (current and non-current)(1) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 27 | 29
Financial assets (current and non-current)(1) | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 27 | 29
Financial assets (current and non-current)(1) | Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 0 | $ 0

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