SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Concentration Risk [Line Items]
Net sales	$ 3,562	$ 3,895
Accounts receivable, net	1,812		$ 1,194
Largest Customer \| Revenue Benchmark \| Customer Concentration Risk
Concentration Risk [Line Items]
Net sales	$ 554	$ 169
Concentration risk (as a percent)	16.00%	4.00%
Largest Customer \| Accounts Receivable \| Customer Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net	$ 289		$ 297
Concentration risk (as a percent)	15.00%		24.00%
Major Customer \| Revenue Benchmark \| Customer Concentration Risk
Concentration Risk [Line Items]
Net sales	$ 181	$ 279
Concentration risk (as a percent)	5.00%	7.00%
Major Customer \| Accounts Receivable \| Customer Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net	$ 215		$ 87
Concentration risk (as a percent)	11.00%		7.00%

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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