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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of financial assets [line items] |  |
Financial assets | $ 4,305 | $ 3,931
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 33,120 | 26,888
Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 931 | 490
Fair value through OCI |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 32,189 | 26,398
Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 846 | 962
Fair value through OCI |  |
Disclosure of financial assets [line items] |  |
Financial assets | 239 | 89
Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,220 | 2,880
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,158 | 2,475
Corporate borrowings | Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Corporate borrowings | Fair value through OCI |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Corporate borrowings | Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,158 | 2,475
Non-recourse borrowings (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 20,020 | 18,544
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) | Fair value through OCI |  |
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 | 20,020 | 18,544
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 6,548 | 3,676
Accounts payable and other | Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Accounts payable and other | Fair value through OCI |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Accounts payable and other | Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 6,548 | 3,676
Financial Liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,374 | 2,173
Financial Liabilities | Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 931 | 490
Financial Liabilities | Fair value through OCI |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Financial Liabilities | Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,443 | 1,683
Preferred shares |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 20 | 20
Preferred shares | Fair value through profit or loss |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Preferred shares | Fair value through OCI |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Preferred shares | Amortized Cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 20 | 20
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 867 | 827
Cash and cash equivalents | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Cash and cash equivalents | Fair value through OCI |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Cash and cash equivalents | Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 867 | 827
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,031 | 1,909
Accounts receivable and other | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Accounts receivable and other | Fair value through OCI |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Accounts receivable and other | Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,031 | 1,909
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 881 | 1,053
Financial assets (current and non-current) | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 523 | 893
Financial assets (current and non-current) | Fair value through OCI |  |
Disclosure of financial assets [line items] |  |
Financial assets | 36 | 16
Financial assets (current and non-current) | Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 322 | 144
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 526 | 142
Marketable securities | Fair value through profit or loss |  |
Disclosure of financial assets [line items] |  |
Financial assets | 323 | 69
Marketable securities | Fair value through OCI |  |
Disclosure of financial assets [line items] |  |
Financial assets | 203 | 73
Marketable securities | Amortized Cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 0 | $ 0

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