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CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Disclosure of objectives, policies and processes for managing capital [line items]            
Total partnership capital $ 21,451 $ 21,952 $ 21,673 $ 18,743 $ 19,058 $ 22,177
Non-controlling interest - in operating subsidiaries (13,475)   (13,954)      
Deficit 2,552   2,752      
Accumulated other comprehensive income (620)   (731)      
Ownership changes (495)   (527)      
Invested Capital $ 9,413 $ 9,410 $ 9,213 $ 9,014 $ 9,011 $ 9,009
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%