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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Capital Structure (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments [Abstract]        
Corporate borrowings $ 3,158 $ 2,475    
Non-recourse borrowings 20,020 18,544    
Subsidiary and corporate borrowings 23,178 21,019    
Preferred shares 20 20    
Cash and cash equivalents (1,393) (969)    
Net debt 21,805 20,070    
Total partnership capital 21,673 22,177 $ 14,668 $ 13,474
Total capital and net debt $ 43,478 $ 42,247    
Net debt to capitalization ratio 50.00% 48.00%