SHAREHOLDERS' EQUITY, Preferred Stock Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2023
Dividends Payable [Line Items]
Total preferred stock dividends declared	$ 2	$ 4
Total preferred stock dividends paid	2	4
Series A Preferred Stock
Dividends Payable [Line Items]
Total preferred stock dividends declared	$ 1	$ 2
Total preferred stock dividends declared, per preferred share amount (in dollars per share)	$ 16.88	$ 33.76
Total preferred stock dividends paid	$ 1	$ 2
Total preferred stock dividends paid, per preferred share amount (in dollars per share)	$ 16.88	$ 33.76
Series B Preferred Stock
Dividends Payable [Line Items]
Total preferred stock dividends declared	$ 1	$ 2
Total preferred stock dividends declared, per preferred share amount (in dollars per share)	$ 15.94	$ 31.88
Total preferred stock dividends paid	$ 1	$ 2
Total preferred stock dividends paid, per preferred share amount (in dollars per share)	$ 15.94	$ 31.88