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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
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