OTHER BORROWINGS (Details) - USD ($) $ in Millions	6 Months Ended
Mar. 31, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Weighted average interest rate	5.75%	5.75%
Total FHLB advances	$ 1,550	$ 1,190
Subordinated notes - fixed-to-floating	100	100
Other	0	1
Total other borrowings	1,650	1,291
Unaccreted premium	$ 2	$ 2
Redemption price percentage	100.00%
FHLB Advance Maturing December 2023 to June 2024
Debt Instrument [Line Items]
Weighted average interest rate	5.09%
Total FHLB advances	$ 850
FHLB Advance Maturing December 2023
Debt Instrument [Line Items]
Weighted average interest rate		3.32%
Total FHLB advances		$ 850
FHLB Advance Maturing Overnight
Debt Instrument [Line Items]
Weighted average interest rate		3.11%
Total FHLB advances	$ 0	$ 140
FHLB Advance Maturing April 2023 to June 2023
Debt Instrument [Line Items]
Weighted average interest rate	5.13%
Total FHLB advances	$ 700
FHLB Advance Maturing December 2022
Debt Instrument [Line Items]
Weighted average interest rate		3.45%
Total FHLB advances		$ 200

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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