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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Financial assets, Carrying $ 4,653 $ 3,982
Financial assets, Fair Value 4,653 3,982
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying 25,608 25,622
Financial liabilities, Fair Value 25,772 26,001
Preferred shares 20 20
Corporate borrowings    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying 3,074 2,475
Financial liabilities, Fair Value 3,169 2,507
Non-recourse borrowings    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying 17,860 18,544
Financial liabilities, Fair Value 17,929 18,891
Accounts payable and other (current and non-current)    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying 2,271 2,410
Financial liabilities, Fair Value 2,271 2,410
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 2,383 2,173
Financial liabilities, Fair Value 2,383 2,173
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets, Carrying 1,380 827
Financial assets, Fair Value 1,380 827
Accounts receivable and other    
Disclosure of financial assets [line items]    
Financial assets, Carrying 1,635 1,960
Financial assets, Fair Value 1,635 1,960
Financial assets (current and non-current)    
Disclosure of financial assets [line items]    
Financial assets, Carrying 1,332 1,053
Financial assets, Fair Value 1,332 1,053
Marketable securities    
Disclosure of financial assets [line items]    
Financial assets, Carrying 306 142
Financial assets, Fair Value $ 306 $ 142