BANK LOANS, NET, Collateral-dependent loans (Details) - USD ($) $ in Millions	Jun. 30, 2024	Sep. 30, 2023
C&I loans \| Commercial real estate and other business assets \| Loans held for investment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	$ 9	$ 11
CRE loans \| Office, multi-family residential, healthcare, medical office, and industrial real estate \| Loans held for investment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	134	47
Residential mortgage loans \| One-to-four family residential mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans in process of foreclosure	2	4
Residential mortgage loans \| Single family homes \| Loans held for investment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	$ 4	$ 5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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