BANK LOANS, NET, Originations, Purchases, and Sales (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Loans held for sale
Payments for Origination and Purchases of Loans Held-for-sale [Abstract]
Loans held for sale originated or purchased	$ 585	$ 877	$ 1,800	$ 2,590
Proceeds from Sale of Loans Held-for-sale [Abstract]
Proceeds from sale of loans held-for-sale	123	197	422	859
Total loans held for investment
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	106	264	410	1,042
Sales	511	103	615	193
Total loans held for investment \| C&I loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	102	156	390	802
Sales	510	103	614	180
Total loans held for investment \| CRE loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	0	0	0	0
Sales	0	0	0	13
Total loans held for investment \| REIT loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	0	14	0	14
Sales	0	0	0	0
Total loans held for investment \| Residential mortgage loans
Purchases and sales of loans held for investment by portfolio segment [Abstract]
Purchases	4	94	20	226
Sales	$ 1	$ 0	$ 1	$ 0

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

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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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