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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of financial assets [line items] |  |
Financial assets | $ 3,473 | $ 3,056
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 19,886 | 17,714
FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 350 | 373
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 | 19,536 | 17,341
FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,111 | 1,115
Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 112 | 64
Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,250 | 1,877
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 1,546 | 1,993
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 | 1,546 | 1,993
Non-recourse borrowings (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 14,200 | 13,113
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 | 14,200 | 13,113
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 2,775 | 1,308
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 | 2,775 | 1,308
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 | 1,345 | 1,280
Financial liabilities (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 350 | 373
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 | 995 | 907
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 715 | 540
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 | 715 | 540
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,357 | 1,171
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 | 1,357 | 1,171
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,217 | 1,172
Financial assets (current and non-current) | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,019 | 989
Financial assets (current and non-current) | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 20 | 17
Financial assets (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 178 | 166
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 184 | 173
Marketable securities | FVTPL (Fair Value) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 92 | 126
Marketable securities | Available for sale securities (Fair Value through OCI) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 92 | 47
Marketable securities | Loans and Receivables/Other Liabilities (Amortized Cost) |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 0 | $ 0

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