SHAREHOLDERS' EQUITY, Preferred Stock Dividends (Details) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Apr. 03, 2023 USD ($) shares	Jun. 30, 2024 USD ($) $ / shares	Jun. 30, 2023 USD ($) $ / shares	Jun. 30, 2024 USD ($) $ / shares	Jun. 30, 2023 USD ($) $ / shares	Sep. 30, 2023 USD ($)
Dividends Payable [Line Items]
Dividends declared			$ 1		$ 5
Dividends paid			2		6
Carrying value		$ 79		$ 79		$ 79
Series A Preferred Stock
Dividends Payable [Line Items]
Preferred stock dividend (as a percent)	6.75%
Dividends declared			$ 0		$ 2
Dividends declared (in usd per share) | $ / shares			$ 0		$ 33.76
Dividends paid			$ 1		$ 3
Dividends paid (in usd per share) | $ / shares			$ 16.88		$ 50.64
Redemption of stock (in shares) | shares	40,250
Carrying value	$ 41
Aggregate redemption value	$ 40
Excess of carrying value over redemption value			$ 1		$ 1
Series B Preferred Stock
Dividends Payable [Line Items]
Preferred stock dividend (as a percent)				6.375%
Dividends declared		$ 1	$ 1	$ 4	$ 3
Dividends declared (in usd per share) | $ / shares		$ 15.94	$ 15.94	$ 47.82	$ 47.82
Dividends paid		$ 1	$ 1	$ 4	$ 3
Dividends paid (in usd per share) | $ / shares		$ 15.94	$ 15.94	$ 47.82	$ 47.82
Carrying value		$ 79		$ 79		$ 79
Series A Depositary Shares
Dividends Payable [Line Items]
Depositary shares ratio	0.025