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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
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