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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Financial assets, Carrying $ 3,473 $ 3,056
Financial assets, Fair Value 3,473 3,056
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying 19,886 17,714
Financial liabilities, Fair Value 20,348 17,958
Preferred shares 20 20
Corporate borrowings    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying 1,546 1,993
Financial liabilities, Fair Value 1,593 1,978
Non-recourse borrowings    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying 14,200 13,113
Financial liabilities, Fair Value 14,615 13,372
Accounts payable and other (current and non-current)    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying 2,775 1,308
Financial liabilities, Fair Value 2,775 1,308
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 1,345 1,280
Financial liabilities, Fair Value 1,345 1,280
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets, Carrying 715 540
Financial assets, Fair Value 715 540
Accounts receivable and other    
Disclosure of financial assets [line items]    
Financial assets, Carrying 1,357 1,171
Financial assets, Fair Value 1,357 1,171
Financial assets (current and non-current)    
Disclosure of financial assets [line items]    
Financial assets, Carrying 1,217 1,172
Financial assets, Fair Value 1,217 1,172
Marketable securities    
Disclosure of financial assets [line items]    
Financial assets, Carrying 184 173
Financial assets, Fair Value $ 184 $ 173