SHAREHOLDERS' EQUITY, Preferred Stock Dividends (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Apr. 03, 2023	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Dividends Payable [Line Items]
Dividends declared				$ 7
Dividends paid				7
Preferred stock		$ 79	$ 79
Series A Preferred Stock
Dividends Payable [Line Items]
Dividends declared				$ 2
Dividends declared (in dollars per share)				$ 33.76
Dividends paid				$ 2
Dividends paid (in dollars per share)				$ 50.64
Redemption of stock (in shares)	40,250
Preferred stock	$ 41
Aggregate redemption value	$ 40
Excess of carrying value over redemption value				$ 1
Series B Preferred Stock
Dividends Payable [Line Items]
Dividends declared		$ 5	$ 5	$ 5
Dividends declared (in dollars per share)		$ 63.76	$ 63.76	$ 63.76
Dividends paid		$ 5	$ 5	$ 5
Dividends paid (in dollars per share)		$ 63.76	$ 63.76	$ 63.76
Preferred stock		$ 79	$ 79