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CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Disclosure of objectives, policies and processes for managing capital [line items]            
Total partnership capital $ 18,743 $ 19,058 $ 22,177 $ 16,233 $ 16,275 $ 14,668
Non-controlling interest - in operating subsidiaries (11,860)   (14,113)      
Deficit 2,450   2,048      
Accumulated other comprehensive income 218   (705)      
Ownership changes (537)   (398)      
Invested Capital $ 9,014 $ 9,011 $ 9,009 $ 8,204 $ 8,202 $ 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%