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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Disclosure of financial assets [line items] |  |
Financial assets, Carrying | $ 5,156 | $ 4,305
Financial assets, Fair Value | 5,156 | 4,305
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 31,397 | 33,120
Financial liabilities, Fair Value | 28,149 | 29,817
Financial Liabilities And Other Liabilities, excluding lease liabilities | 27,936 | 29,317
Preferred shares | 20 | 20
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 2,822 | 3,158
Financial liabilities, Fair Value | 2,939 | 3,350
Non-recourse borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 19,999 | 20,020
Financial liabilities, Fair Value | 20,095 | 20,328
Accounts payable and other (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 2,201 | 2,745
Financial liabilities, Fair Value | 2,201 | 2,745
Preferred shares |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 20 | 20
Financial liabilities, Fair Value | 20 | 20
Financial liabilities (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 2,894 | 3,374
Financial liabilities, Fair Value | 2,894 | 3,374
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 1,275 | 867
Financial assets, Fair Value | 1,275 | 867
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 2,275 | 2,031
Financial assets, Fair Value | 2,275 | 2,031
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 919 | 881
Financial assets, Fair Value | 919 | 881
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 687 | 526
Financial assets, Fair Value | $ 687 | $ 526

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