SHAREHOLDERS' EQUITY, Preferred Stock by Class (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Sep. 30, 2023
Class of Stock [Line Items]
Carrying value	$ 79	$ 79
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock dividend (as a percent)	6.375%
Preferred stock, shares outstanding (in shares)	80,500	80,500
Carrying value	$ 79	$ 79
Aggregate liquidation preference	$ 81	$ 81