BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Loans held for sale, net
Payments for Origination and Purchases of Loans Held-for-sale [Abstract]
Loans held for sale purchased or originated	$ 1,790	$ 2,330	$ 1,690
Proceeds from Sale of Loans Held-for-sale [Abstract]
Proceeds for sale of loans held for sale	776	800	606
Loans held for investment
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	996	1,488	915
Sales	627	126	213
Loans held for investment \| C&I loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	589	1,046	467
Sales	598	126	213
Loans held for investment \| CRE loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	5	42	145
Sales	27	0	0
Loans held for investment \| Residential mortgage loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	402	400	303
Sales	$ 2	$ 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
-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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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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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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-Publisher FASB
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