BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Loans held for sale
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Loans held for sale originated or purchased	$ 999	$ 528	$ 1,970	$ 1,110
Proceeds from sale of loans held-for-sale	339	207	677	395
Loans held for investment
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	664	652	1,187	820
Sales	61	95	112	100
Loans held for investment \| C&I loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	441	538	780	660
Sales	61	95	112	100
Loans held for investment \| Residential mortgage loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	223	114	407	160
Sales	$ 0	$ 0	$ 0	$ 0

[Line Items] for Financing Receivables, Schedule of Purchases and Sales [Table]

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Amount of increase from purchase of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447

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-Topic 310
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-Section 50
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Amount of decrease from sale and reclassification to held-for-sale of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447

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-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3461-108585

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-Subparagraph (a)
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-Topic 230
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