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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value 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, Carrying Value | $ 4,305 | $ 3,931
Financial assets, Fair Value | 4,305 | 3,931
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying Value | 33,120 | 26,888
Financial liabilities, Fair Value | 33,620 | 27,267
Preferred shares | 20 | 20
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying Value | 3,158 | 2,475
Financial liabilities, Fair Value | 3,350 | 2,507
Non-recourse borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying Value | 20,020 | 18,544
Financial liabilities, Fair Value | 20,328 | 18,891
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying Value | 6,548 | 3,676
Financial liabilities, Fair Value | 6,548 | 3,676
Preferred shares |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying Value | 20 | 20
Financial liabilities, Fair Value | 20 | 20
Financial Liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying Value | 3,374 | 2,173
Financial liabilities, Fair Value | 3,374 | 2,173
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying Value | 867 | 827
Financial assets, Fair Value | 867 | 827
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying Value | 2,031 | 1,909
Financial assets, Fair Value | 2,031 | 1,909
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying Value | 881 | 1,053
Financial assets, Fair Value | 881 | 1,053
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying Value | 526 | 142
Financial assets, Fair Value | $ 526 | $ 142

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