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DEBT - Non-convertible secured promissory note (Details) - USD ($) $ in Millions		3 Months Ended
	Dec. 18, 2023	Dec. 31, 2023	Sep. 30, 2023
Debt Instrument [Line Items]
Settlement cost			$ 18
Liabilities reclassified	$ 18
Non-convertible secured promissory note
Debt Instrument [Line Items]
Principal amount	50
Proceeds from financing	32
Original issue discount	$ 18		18
Settlement cost			$ 18
Liabilities reclassified		$ 18
Interest rate (as a percent)	10.00%
Default interest rate	18.00%
Maturity term	3 months

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