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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Concentration Risk [Line Items]      
Net sales $ 4,392 $ 3,562  
Accounts receivable, net 2,265   $ 1,702
Largest Customer | Revenue from Contract with Customer Benchmark | Customer Concentration Risk      
Concentration Risk [Line Items]      
Net sales $ 456 $ 554  
Concentration risk (as a percent) 10.00% 16.00%  
Largest Customer | Accounts Receivable | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 13.00%   10.00%
Accounts receivable, net $ 301   $ 179
Major Customer | Revenue from Contract with Customer Benchmark | Customer Concentration Risk      
Concentration Risk [Line Items]      
Net sales $ 253 $ 181  
Concentration risk (as a percent) 6.00% 5.00%  
Major Customer | Accounts Receivable | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 10.00%   8.00%
Accounts receivable, net $ 239   $ 133