BANK LOANS, NET, Purchases and Sales of Loans Held for Investment (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Held for sale loans
Payments for Origination and Purchases of Loans Held-for-sale [Abstract]
Loans held for sale purchased or originated	$ 3,570	$ 2,800	$ 2,740
Proceeds from Sale of Loans Held-for-sale [Abstract]
Proceeds for sale of loans held for sale	1,080	618	835
Total loans held for investment
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	1,304	1,339	984
Sales	232	385	643
Total loans held for investment \| C&I loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	1,003	1,038	465
Sales	219	376	643
Total loans held for investment \| CRE loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	0	0	39
Sales	13	0	0
Total loans held for investment \| REIT loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	14	5	24
Sales	0	9	0
Total loans held for investment \| Residential mortgage loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	287	296	456
Sales	$ 0	$ 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.

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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.

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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.

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