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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Apr. 14, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]      
Debt in breach of asset-level financial covenants $ 540,000,000    
Percent of partnership debt in breach of asset-level financial covenants 2.30%    
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets $ 4,305,000,000   $ 3,931,000,000
Market risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% change in value of investments on Equity 52,000,000    
Impact of 10 Percent Change in Value of Investments on Profit Loss 32,000,000    
Impact of 10% change in value of investments on Comprehensive Income 20,000,000    
Marketable securities      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 526,000,000   142,000,000
Marketable securities | Market risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 526,000,000   142,000,000
Corporate revolving credit facility      
Disclosure of detailed information about borrowings [line items]      
Credit facility, maximum borrowing capacity 1,975,000,000    
Non-recourse borrowings 1,131,000,000   820,000,000
Letter of credit outstanding amount 63,000,000   54,000,000
Credit facility      
Disclosure of detailed information about borrowings [line items]      
Credit facility, maximum borrowing capacity 500,000,000    
Non-recourse borrowings 0   $ 0
Syndicated Revolving Credit Facility      
Disclosure of detailed information about borrowings [line items]      
Credit facility, maximum borrowing capacity $ 1,000,000,000.0 $ 1,000,000,000.0