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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
customer
Sep. 30, 2019
USD ($)
customer
Sep. 30, 2020
USD ($)
customer
Sep. 30, 2019
USD ($)
customer
Dec. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]          
Remit payment period     120 days    
Revenues $ 1,539 $ 1,125 $ 4,431 $ 2,618  
Deferred revenue $ 75   75   $ 54
Deferred revenue, revenue recognized     $ 45 $ 65  
Customer Concentration Risk | Revenue Benchmark          
Disaggregation of Revenue [Line Items]          
Number of customers | customer 3 3 3 2  
Customer Concentration Risk | Revenue Benchmark | Customer One          
Disaggregation of Revenue [Line Items]          
Percentage of concentration 17.00% 17.00% 19.00% 14.00%  
Customer Concentration Risk | Revenue Benchmark | Customer Two          
Disaggregation of Revenue [Line Items]          
Percentage of concentration 15.00% 14.00% 17.00% 12.00%  
Customer Concentration Risk | Revenue Benchmark | Customer Three          
Disaggregation of Revenue [Line Items]          
Percentage of concentration 12.00% 11.00% 12.00%    
Customer Concentration Risk | Accounts Receivable          
Disaggregation of Revenue [Line Items]          
Number of customers | customer     3    
Customer Concentration Risk | Accounts Receivable | Customer One          
Disaggregation of Revenue [Line Items]          
Percentage of concentration     18.00%    
Customer Concentration Risk | Accounts Receivable | Customer Two          
Disaggregation of Revenue [Line Items]          
Percentage of concentration     16.00%    
Customer Concentration Risk | Accounts Receivable | Customer Three          
Disaggregation of Revenue [Line Items]          
Percentage of concentration     13.00%    
Distribution Revenue Rebate          
Disaggregation of Revenue [Line Items]          
Revenues $ (128)   $ (252)