BANK LOANS, NET, Past Due, Nonaccrual, and Modified Loans and Collateral Dependent Loans (Details) - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
Financing Receivable, Past Due [Line Items]
Performing nonaccrual loans	$ 127	$ 89
SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	18,497	16,233
C&I loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	10,754	9,953
CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	7,777	7,615
REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,735	1,716
Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	9,976	9,412
Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,311	1,338
Loans held for investment
Financing Receivable, Past Due [Line Items]
Total loans held for investment	50,050	46,267
Nonaccrual with allowance	186	144
Nonaccrual with no allowance	28	31
Loans held for investment \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	18,497	16,233
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	0	0
Loans held for investment \| C&I loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	10,754	9,953
Nonaccrual with allowance	47	58
Nonaccrual with no allowance	5	0
Loans held for investment \| CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	7,777	7,615
Nonaccrual with allowance	120	67
Nonaccrual with no allowance	9	18
Loans held for investment \| REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,735	1,716
Nonaccrual with allowance	19	19
Nonaccrual with no allowance	0	0
Loans held for investment \| Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	9,976	9,412
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	14	13
Loans held for investment \| Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,311	1,338
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	0	0
Loans held for investment \| Total past due and accruing
Financing Receivable, Past Due [Line Items]
Total loans held for investment	3	6
Loans held for investment \| Total past due and accruing \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1	3
Loans held for investment \| Total past due and accruing \| C&I loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| Total past due and accruing \| CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| Total past due and accruing \| REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| Total past due and accruing \| Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	2	3
Loans held for investment \| Total past due and accruing \| Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 30-89 days and accruing
Financing Receivable, Past Due [Line Items]
Total loans held for investment	3	6
Loans held for investment \| 30-89 days and accruing \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1	3
Loans held for investment \| 30-89 days and accruing \| C&I loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 30-89 days and accruing \| CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 30-89 days and accruing \| REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 30-89 days and accruing \| Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	2	3
Loans held for investment \| 30-89 days and accruing \| Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 90 days or more and accruing
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 90 days or more and accruing \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 90 days or more and accruing \| C&I loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 90 days or more and accruing \| CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 90 days or more and accruing \| REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 90 days or more and accruing \| Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| 90 days or more and accruing \| Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	0
Loans held for investment \| Current and accruing
Financing Receivable, Past Due [Line Items]
Total loans held for investment	49,833	46,086
Loans held for investment \| Current and accruing \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	18,496	16,230
Loans held for investment \| Current and accruing \| C&I loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	10,702	9,895
Loans held for investment \| Current and accruing \| CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	7,648	7,530
Loans held for investment \| Current and accruing \| REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,716	1,697
Loans held for investment \| Current and accruing \| Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	9,960	9,396
Loans held for investment \| Current and accruing \| Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	$ 1,311	$ 1,338

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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