BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Loans held for sale
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Loans held for sale originated or purchased	$ 185	$ 522	$ 1,330	$ 1,790
Proceeds from sale of loans held-for-sale	130	159	564	516
Loans held for investment
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	113	389	739	1,226
Sales	292	7	312	100
Loans held for investment \| C&I loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	0	247	363	937
Sales	265	7	285	100
Loans held for investment \| CRE loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	0	10	5	35
Sales	27	0	27	0
Loans held for investment \| Residential mortgage loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	113	132	371	254
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
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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
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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
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-URI http://asc.fasb.org/extlink&oid=118932676&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
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