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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Disclosure of financial assets [line items] |  |
Financial assets, Carrying | $ 2,760 | $ 2,134
Financial assets, Fair Value | 2,760 | 2,134
Disclosure of financial liabilities [line items] |  |
Preferred shares | 20 | 20
Financial liabilities, Carrying | 13,199 | 12,361
Financial liabilities, Fair Value | 13,493 | 12,702
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 1,256 | 2,101
Financial liabilities, Fair Value | 1,261 | 2,113
Non-recourse borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 9,689 | 8,063
Financial liabilities, Fair Value | 9,978 | 8,392
Accounts payable and other (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 1,026 | 864
Financial liabilities, Fair Value | 1,026 | 864
Preferred shares |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 20 | 20
Financial liabilities, Fair Value | 20 | 20
Financial liabilities (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 1,208 | 1,313
Financial liabilities, Fair Value | 1,208 | 1,313
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 782 | 374
Financial assets, Fair Value | 782 | 374
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 949 | 838
Financial assets, Fair Value | 949 | 838
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 838 | 837
Financial assets, Fair Value | 838 | 837
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 191 | 85
Financial assets, Fair Value | $ 191 | $ 85

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