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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Concentration Risk [Line Items]          
Net sales $ 4,853 $ 4,624 $ 8,415 $ 8,519  
Accounts receivable, net 1,972   1,972   $ 1,194
Largest Customer | Revenue Benchmark | Customer Concentration Risk          
Concentration Risk [Line Items]          
Net sales $ 654 $ 296 $ 1,208 $ 465  
Concentration risk (as a percent) 13.00% 6.00% 14.00% 5.00%  
Largest Customer | Accounts Receivable | Customer Concentration Risk          
Concentration Risk [Line Items]          
Accounts receivable, net $ 404   $ 404   $ 297
Concentration risk (as a percent)     20.00%   24.00%