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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Financial assets $ 613 $ 623
Disclosure of financial liabilities [line items]    
Financial liabilities 7,234 5,021
Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 69 77
Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 7,165 4,944
Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 27 29
Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets 586 594
Accounts payable and other    
Disclosure of financial liabilities [line items]    
Financial liabilities 505 487
Accounts payable and other | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Accounts payable and other | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 505 487
Non-recourse borrowings (current and non-current)    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,477 3,526
Non-recourse borrowings (current and non-current) | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Non-recourse borrowings (current and non-current) | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,477 3,526
Exchangeable and class B shares(2)    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,221 0
Exchangeable and class B shares(2) | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 0  
Exchangeable and class B shares(2) | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,221  
Financial liabilities (current and non-current)(1)    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,031 1,008
Financial liabilities (current and non-current)(1) | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 69 77
Financial liabilities (current and non-current)(1) | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 962 931
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 192 204
Cash and cash equivalents | Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 0 0
Cash and cash equivalents | Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets 192 204
Accounts receivable and other    
Disclosure of financial assets [line items]    
Financial assets 394 390
Accounts receivable and other | Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 0 0
Accounts receivable and other | Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets 394 390
Financial assets (current and non-current)(1)    
Disclosure of financial assets [line items]    
Financial assets 27 29
Financial assets (current and non-current)(1) | Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 27 29
Financial assets (current and non-current)(1) | Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets $ 0 $ 0