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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Concentration Risk [Line Items]          
Net sales $ 3,864 $ 3,345 $ 12,279 $ 11,864  
Accounts receivable, net 1,735   1,735   $ 1,194
Largest Customer | Revenue Benchmark | Customer Concentration Risk          
Concentration Risk [Line Items]          
Net sales $ 690 $ 143 $ 1,898 $ 608  
Concentration risk (as a percent) 18.00% 4.00% 15.00% 5.00%  
Largest Customer | Accounts Receivable | Customer Concentration Risk          
Concentration Risk [Line Items]          
Accounts receivable, net $ 366   $ 366   $ 297
Concentration risk (as a percent)     21.00%   24.00%
Other Major Customer | Revenue Benchmark | Customer Concentration Risk          
Concentration Risk [Line Items]          
Net sales $ 167 $ 149 $ 510 $ 589  
Concentration risk (as a percent) 4.00% 4.00% 4.00% 5.00%  
Other Major Customer | Accounts Receivable | Customer Concentration Risk          
Concentration Risk [Line Items]          
Accounts receivable, net $ 179   $ 179   $ 87
Concentration risk (as a percent)     10.00%   7.00%