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REVENUES REVENUES - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
customer
Jun. 30, 2019
USD ($)
Disclosure of geographical areas [line items]        
Revenues $ 1,946 $ 1,685 $ 4,142 $ 3,278
Partnership's Sales Revenue, Net [Member] | Customer Concentration Risk 1 [Member]        
Disclosure of geographical areas [line items]        
Concentration Risk, Number of Customers | customer     1  
Revenues $ 216 $ 288 $ 478 $ 577
Bottom of range | Partnership's Sales Revenue, Net [Member] | Customer Concentration Risk 1 [Member]        
Disclosure of geographical areas [line items]        
Percentage of entity's revenue     10.00%