BANK LOANS, NET, Held for Sale and Held for Investment (Details) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 42,220	$ 25,314
Allowance for credit losses	(377)	(320)
Bank loans, net	41,843	24,994
Accrued interest receivable on bank loans	$ 99	$ 48
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	100.00%	100.00%
Net unamortized discounts, unearned income, and deferred loan fees and costs	$ (131)	$ 1
Allowance for credit losses percent of held for investment loan portfolio	0.90%	1.27%
C&I loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 10,897	$ 8,440
CRE loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	6,354	2,872
REIT loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	1,416	1,112
Tax-exempt loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	1,347	1,321
Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	6,728	5,318
SBL and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	15,312	6,106
Loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 42,054	$ 25,169
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	99.00%	99.00%
Loans held for investment \| C&I loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 10,897	$ 8,440
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	26.00%	33.00%
Loans held for investment \| C&I loans \| Asset pledged as collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bank loans, net	$ 797
Loans held for investment \| CRE loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 6,354	$ 2,872
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	15.00%	11.00%
Loans held for investment \| CRE loans \| Asset pledged as collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bank loans, net	$ 1,500
Loans held for investment \| REIT loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 1,416	$ 1,112
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	3.00%	5.00%
Loans held for investment \| Tax-exempt loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 1,347	$ 1,321
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	3.00%	5.00%
Loans held for investment \| Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 6,728	$ 5,318
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	16.00%	21.00%
Loans held for investment \| Residential mortgage loans \| Asset pledged as collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bank loans, net	$ 5,800
Loans held for investment \| SBL and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 15,312	$ 6,106
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	36.00%	24.00%
Loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable past due	$ 166	$ 145
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	1.00%	1.00%

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