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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of financial assets [line items] |  |
Financial assets, Carrying | $ 2,134 | $ 2,412
Financial assets, Fair Value | 2,134 | 2,412
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 12,361 | 9,439
Financial liabilities, Fair Value | 12,702 | 9,614
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 2,101 | 1,002
Financial liabilities, Fair Value | 2,113 | 1,023
Non-recourse borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 8,063 | 7,324
Financial liabilities, Fair Value | 8,392 | 7,478
Accounts payable and other (current and non-current) |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 864 | 712
Financial liabilities, Fair Value | 864 | 712
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 | 1,313 | 381
Financial liabilities, Fair Value | 1,313 | 381
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 374 | 786
Financial assets, Fair Value | 374 | 786
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 838 | 485
Financial assets, Fair Value | 838 | 485
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 837 | 1,138
Financial assets, Fair Value | 837 | 1,138
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 85 | 3
Financial assets, Fair Value | $ 85 | $ 3

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