BANK LOANS, NET, Past Due, Nonaccrual, and Modified Loans and Collateral Dependent Loans (Details) - USD ($) $ in Millions	Mar. 31, 2024	Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Performing nonaccrual loans	$ 103	$ 96
SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	14,610	14,606
C&I loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	10,190	10,406
Loans modified		21
CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	7,462	7,221
Loans modified		3
REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,701	1,668
Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	9,016	8,662
Residential mortgage - first mortgage loans
Financing Receivable, Past Due [Line Items]
Loans modified		10
Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,445	1,541
Loans held for investment
Financing Receivable, Past Due [Line Items]
Total loans held for investment	44,424	44,104
Nonaccrual with allowance	169	104
Nonaccrual with no allowance	18	24
Loans held for investment \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	14,610	14,606
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	10,190	10,406
Nonaccrual with allowance	66	69
Nonaccrual with no allowance	0	2
Loans held for investment \| CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	7,462	7,221
Nonaccrual with allowance	103	35
Nonaccrual with no allowance	11	13
Loans held for investment \| REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,701	1,668
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	0	0
Loans held for investment \| Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	9,016	8,662
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	7	9
Loans held for investment \| Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,445	1,541
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	5	11
Loans held for investment \| Total past due and accruing \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	9
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	2	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	3	2
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	5	11
Loans held for investment \| 30-89 days and accruing \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	0	9
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	2	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	3	2
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	44,232	43,965
Loans held for investment \| Current and accruing \| SBL
Financing Receivable, Past Due [Line Items]
Total loans held for investment	14,610	14,597
Loans held for investment \| Current and accruing \| C&I loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	10,124	10,335
Loans held for investment \| Current and accruing \| CRE loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	7,346	7,173
Loans held for investment \| Current and accruing \| REIT loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	1,701	1,668
Loans held for investment \| Current and accruing \| Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	9,006	8,651
Loans held for investment \| Current and accruing \| Tax-exempt loans
Financing Receivable, Past Due [Line Items]
Total loans held for investment	$ 1,445	$ 1,541

Financing Receivable, Performing, Non Accrual Loans

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- Definition

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

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- Definition

Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty.

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Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

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Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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