BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Loans held for sale
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Loans held for sale originated or purchased	$ 582	$ 706
Proceeds from sale of loans held-for-sale	188	214
Loans held for investment
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	168	225
Sales	5	20
Loans held for investment \| C&I loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	122	67
Sales	5	20
Loans held for investment \| Residential mortgage loans
Financing Receivables, Schedule of Purchases and Sales [Line Items]
Purchases	46	158
Sales	$ 0	$ 0

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

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- Definition

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=121599337&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=121599337&loc=SL82919244-210447

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-URI http://asc.fasb.org/extlink&oid=121611835&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=121586364&loc=d3e3461-108585

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- Definition

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
-Paragraph 16
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-Topic 230
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3461-108585

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