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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of financial assets [line items] |  |
Financial assets | $ 2,134 | $ 2,412
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 12,361 | 9,439
FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 440 | 381
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 | 11,921 | 9,058
FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 608 | 893
Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 142 | 15
Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,384 | 1,504
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,101 | 1,002
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 | 2,101 | 1,002
Non-recourse borrowings (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 8,063 | 7,324
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 | 8,063 | 7,324
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 864 | 712
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 | 864 | 712
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 | 1,313 | 381
Financial liabilities (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 440 | 381
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 | 873 | 0
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 374 | 786
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 | 374 | 786
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets | 838 | 485
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 | 838 | 485
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 837 | 1,138
Financial assets (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 608 | 893
Financial assets (current and non-current) | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 57 | 12
Financial assets (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 172 | 233
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 85 | 3
Marketable securities | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Marketable securities | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 85 | 3
Marketable securities | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 0 | $ 0

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