BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Loans held for sale
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Loans held for sale originated or purchased	$ 699	$ 683	$ 2,130	$ 2,650
Proceeds from sale of loans held-for-sale	221	345	574	1,020
Loans held for investment
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	97	822	817	2,009
Sales	441	33	588	145
Loans held for investment \| C&I loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	3	439	360	1,219
Sales	441	33	588	145
Loans held for investment \| CRE loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	0	0	39	0
Sales	0	0	0	0
Loans held for investment \| REIT loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	0	0	24	0
Sales	0	0	0	0
Loans held for investment \| Residential mortgage loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	94	383	394	790
Sales	$ 0	$ 0	$ 0	$ 0

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Amount of increase in financing receivable from purchase. Excludes net investment in lease.

+ References

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-Topic 326
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-Name Accounting Standards Codification
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Amount of decrease in financing receivable from sale and reclassification to held-for-sale. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-11

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The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
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-Topic 230
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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
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