OTHER BORROWINGS, Schedule of Other Borrowings (Details) - USD ($) $ in Millions	Mar. 31, 2024	Sep. 30, 2023
Other Borrowings [Abstract]
Total FHLB advances	$ 1,000	$ 1,000
Total other borrowings	$ 1,299	$ 1,100
FHLB Advance Maturing March 2025 To June 2025
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)	5.65%
Total FHLB advances	$ 650
FHLB Advance Maturing June 2024 To December 2028
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)	4.77%
Total FHLB advances	$ 350
FHLB Advance Maturing December 2023 - March 2025
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)		5.62%
Total FHLB advances		$ 850
FHLB Advance Maturing December 2023
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)		5.70%
Total FHLB advances		$ 150
Subordinated notes due 2030
Other Borrowings [Abstract]
Subordinated notes - fixed-to-floating	99	100
Subordinated Debt
Other Borrowings [Abstract]
Unaccreted premium	$ 1	$ 2
Subordinated Debt \| Subordinated notes due 2030
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)	5.75%	5.75%
Unsecured lines of credit \| Unsecured Lines Of Credit Maturing Overnight
Other Borrowings [Abstract]
Weighted average interest rate (as a percent)	7.07%
Unsecured lines of credit	$ 200	$ 0

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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Amount, after accumulated amortization, of debt premium.

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Weighted average interest rate of debt outstanding.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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