OTHER BORROWINGS, Schedule of Other Borrowings (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 01, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
FHLB advances	$ 1,250		$ 850
Other	3		8
Total other borrowings	1,353		858
Premium	2		0
Subordinated notes due 2030
Debt Instrument [Line Items]
5.75% fixed-to-floating subordinated notes, due 2030 (including premium of $2 and $0, respectively)	$ 100		$ 0
Stated interest rate		5.75%

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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