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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of financial assets [line items] |  |
Financial assets, Carrying | $ 3,056 | $ 2,134
Financial assets, Fair Value | 3,056 | 2,134
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 17,714 | 12,361
Financial liabilities, Fair Value | 17,958 | 12,702
Preferred shares | 20 | 20
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 1,993 | 2,101
Financial liabilities, Fair Value | 1,978 | 2,113
Non-recourse borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 13,113 | 8,063
Financial liabilities, Fair Value | 13,372 | 8,392
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities, Carrying | 1,308 | 864
Financial liabilities, Fair Value | 1,308 | 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 | 1,280 | 1,313
Financial liabilities, Fair Value | 1,280 | 1,313
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 540 | 374
Financial assets, Fair Value | 540 | 374
Accounts receivable and other |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 1,171 | 838
Financial assets, Fair Value | 1,171 | 838
Financial assets (current and non-current) |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 1,172 | 837
Financial assets, Fair Value | 1,172 | 837
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets, Carrying | 173 | 85
Financial assets, Fair Value | $ 173 | $ 85

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