BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Loans held for sale
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Loans held for sale originated or purchased	$ 443	$ 475	$ 1,150	$ 1,270
Proceeds from sale of loans held-for-sale	220	100	434	357
Loans held for investment
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	401	499	626	837
Sales	0	24	20	93
Loans held for investment \| C&I loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	296	428	363	690
Sales	0	24	20	93
Loans held for investment \| CRE loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	5	25	5	25
Sales	0	0	0	0
Loans held for investment \| Residential mortgage loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	100	46	258	122
Sales	$ 0	$ 0	$ 0	$ 0

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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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