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CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of objectives, policies and processes for managing capital [line items]        
Total partnership capital $ 21,673 $ 22,177 $ 14,668 $ 13,474
Non-controlling interest - in operating subsidiaries (13,954) (14,113)    
Deficit 2,752 2,048    
Accumulated other comprehensive income (731) (705)    
Ownership changes (527) (398)    
Invested Capital $ 9,213 $ 9,009 $ 8,156  
Bottom of range        
Disclosure of objectives, policies and processes for managing capital [line items]        
Targeted returns on invested capital 12.00%      
Top of range        
Disclosure of objectives, policies and processes for managing capital [line items]        
Targeted returns on invested capital 15.00%