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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of financial assets [line items] |  |
Financial assets | $ 5,156 | $ 4,305
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 31,397 | 33,120
FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 641 | 931
Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 30,756 | 32,189
FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 974 | 846
Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 295 | 239
Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,887 | 3,220
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,822 | 3,158
Corporate borrowings | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Corporate borrowings | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Corporate borrowings | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,822 | 3,158
Non-recourse borrowings (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 19,999 | 20,020
Non-recourse borrowings (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Non-recourse borrowings (current and non-current) | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Non-recourse borrowings (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 19,999 | 20,020
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,201 | 2,745
Accounts payable and other | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Accounts payable and other | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Accounts payable and other | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,201 | 2,745
Financial liabilities (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,894 | 3,374
Financial liabilities (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 641 | 931
Financial liabilities (current and non-current) | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Financial liabilities (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,253 | 2,443
Lease liabilities [member] |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,461 | 3,803
Lease liabilities [member] | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Lease liabilities [member] | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Lease liabilities [member] | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,461 | 3,803
Preferred shares |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 20 | 20
Preferred shares | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Preferred shares | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Preferred shares | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 20 | 20
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,275 | 867
Cash and cash equivalents | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Cash and cash equivalents | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Cash and cash equivalents | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,275 | 867
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,275 | 2,031
Accounts receivable and other | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Accounts receivable and other | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Accounts receivable and other | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,275 | 2,031
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 919 | 881
Financial assets (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 582 | 523
Financial assets (current and non-current) | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 36
Financial assets (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 337 | 322
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 687 | 526
Marketable securities | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 392 | 323
Marketable securities | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 295 | 203
Marketable securities | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 0 | $ 0

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