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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Value of Financial Instruments (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2020
Mar. 30, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]      
Carrying Value $ 613   $ 623
Fair Value 613   623
Disclosure of financial liabilities [line items]      
Carrying Value 7,234   5,021
Fair Value 7,480   5,172
Preferred Shares   $ 25.00  
Accounts payable and other (current and non-current)      
Disclosure of financial liabilities [line items]      
Carrying Value 505   487
Fair Value 505   487
Non-recourse borrowings (current and non-current)(1)      
Disclosure of financial liabilities [line items]      
Carrying Value 3,477   3,526
Fair Value 3,723   3,677
Exchangeable and class B shares(2)      
Disclosure of financial liabilities [line items]      
Carrying Value 2,221   0
Fair Value 2,221   0
Financial liabilities (current and non-current)(1)      
Disclosure of financial liabilities [line items]      
Carrying Value 1,031   1,008
Fair Value 1,031   1,008
Class C Shares      
Disclosure of financial liabilities [line items]      
Fair Value 69    
Cash and cash equivalents      
Disclosure of financial assets [line items]      
Carrying Value 192   204
Fair Value 192   204
Accounts receivable and other      
Disclosure of financial assets [line items]      
Carrying Value 394   390
Fair Value 394   390
Financial assets (current and non-current)(1)      
Disclosure of financial assets [line items]      
Carrying Value 27   29
Fair Value $ 27   $ 29