SHAREHOLDERS' EQUITY, Preferred Stock Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Dividends Payable [Line Items]
Total preferred stock dividends declared	$ 1	$ 2	$ 5	$ 2
Total preferred stock dividends paid	2	0	6	0
Series A Preferred Stock
Dividends Payable [Line Items]
Total preferred stock dividends declared	$ 0	$ 1	$ 2	$ 1
Total preferred stock dividends declared, per preferred share amount (in dollars per share)	$ 0	$ 16.88	$ 33.76	$ 16.88
Total preferred stock dividends paid	$ 1	$ 0	$ 3
Total preferred stock dividends paid, per preferred share amount (in dollars per share)	$ 16.88	$ 0	$ 50.64	$ 0
Excess of carrying value over redemption value	$ 1		$ 1
Series B Preferred Stock
Dividends Payable [Line Items]
Total preferred stock dividends declared	$ 1	$ 1	$ 3	$ 1
Total preferred stock dividends declared, per preferred share amount (in dollars per share)	$ 15.94	$ 15.94	$ 47.82	$ 15.94
Total preferred stock dividends paid	$ 1	$ 0	$ 3	$ 0
Total preferred stock dividends paid, per preferred share amount (in dollars per share)	$ 15.94	$ 0	$ 47.82	$ 0