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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Financial assets, Carrying Value $ 4,305 $ 3,931
Financial assets, Fair Value 4,305 3,931
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying Value 33,120 26,888
Financial liabilities, Fair Value 33,620 27,267
Preferred shares 20 20
Corporate borrowings    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying Value 3,158 2,475
Financial liabilities, Fair Value 3,350 2,507
Non-recourse borrowings    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying Value 20,020 18,544
Financial liabilities, Fair Value 20,328 18,891
Accounts payable and other    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying Value 6,548 3,676
Financial liabilities, Fair Value 6,548 3,676
Preferred shares    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying Value 20 20
Financial liabilities, Fair Value 20 20
Financial Liabilities    
Disclosure of financial liabilities [line items]    
Financial liabilities, Carrying Value 3,374 2,173
Financial liabilities, Fair Value 3,374 2,173
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets, Carrying Value 867 827
Financial assets, Fair Value 867 827
Accounts receivable and other    
Disclosure of financial assets [line items]    
Financial assets, Carrying Value 2,031 1,909
Financial assets, Fair Value 2,031 1,909
Financial assets (current and non-current)    
Disclosure of financial assets [line items]    
Financial assets, Carrying Value 881 1,053
Financial assets, Fair Value 881 1,053
Marketable securities    
Disclosure of financial assets [line items]    
Financial assets, Carrying Value 526 142
Financial assets, Fair Value $ 526 $ 142