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CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of objectives, policies and processes for managing capital [line items]        
Total partnership capital $ 14,668 $ 13,474 $ 9,644 $ 7,176
Non-controlling interest - in operating subsidiaries (7,303) (5,875)    
Deficit 1,228 1,366    
Accumulated other comprehensive income (328) (1,257)    
Ownership changes (109) (109)    
Invested Capital $ 8,156 $ 7,599 $ 6,387  
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%