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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of financial assets [line items] |  |
Financial assets | $ 3,056 | $ 2,134
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 17,714 | 12,361
FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 373 | 440
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 | 17,341 | 11,921
FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,115 | 608
Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 64 | 142
Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,877 | 1,384
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 1,993 | 2,101
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 | 1,993 | 2,101
Non-recourse borrowings (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 13,113 | 8,063
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 | 13,113 | 8,063
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 1,308 | 864
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 | 1,308 | 864
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
Financial liabilities (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 1,280 | 1,313
Financial liabilities (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 373 | 440
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 | 907 | 873
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 540 | 374
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 | 540 | 374
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,171 | 838
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 | 1,171 | 838
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,172 | 837
Financial assets (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 989 | 608
Financial assets (current and non-current) | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 17 | 57
Financial assets (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 166 | 172
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 173 | 85
Marketable securities | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 126 | 0
Marketable securities | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 47 | 85
Marketable securities | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 0 | $ 0

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