BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Loans held for sale
Payments for Origination and Purchases of Loans Held-for-sale [Abstract]
Loans held for sale originated or purchased	$ 497	$ 706
Proceeds from Sale of Loans Held-for-sale [Abstract]
Proceeds from sale of loans held-for-sale	177	165
Total loans held for investment
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	179	307
Sales	84	48
Total loans held for investment \| C&I loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	165	242
Sales	84	48
Total loans held for investment \| Residential mortgage loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	14	65
Sales	$ 0	$ 0

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Amount of increase in financing receivable from purchase. Excludes net investment in lease.

+ References

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Amount of decrease in financing receivable from sale and reclassification to held-for-sale. Excludes net investment in lease.

+ References

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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
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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
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