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CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Capital Management [Abstract]        
Total partnership capital $ 13,474 $ 9,644 $ 7,176 $ 6,322
Non-controlling interest - in operating subsidiaries (5,875) (2,771)    
Deficit 1,366 697    
Accumulated other comprehensive income (1,257) (1,074)    
Ownership changes (109) (109)    
Invested Capital $ 7,599 $ 6,387 $ 5,452  
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%