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CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of objectives, policies and processes for managing capital [line items]        
Total partnership capital $ 22,177 $ 14,668 $ 13,474 $ 9,644
Non-controlling interest - in operating subsidiaries (14,113) (7,303)    
Deficit 2,048 1,228    
Accumulated other comprehensive income (705) (328)    
Ownership changes (398) (109)    
Invested Capital $ 9,009 $ 8,156 $ 7,599  
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%