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BANK LOANS, NET, Held for Sale and Held for Investment (Details) - USD ($) $ in Millions	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023
Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	$ 50,305		$ 46,451
Allowance for credit losses	(465)		(457)
Loans, net	$ 49,840		$ 45,994
ACL as a % of total loans held for investment	0.93%		0.99%
Accrued interest receivable on bank loans, location	Other receivables, net		Other receivables, net
Accrued interest receivable on bank loans (included in “Other receivables, net”)	$ 207		$ 214
Loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	50,050		46,267
Allowance for credit losses	(465)	$ (452)	(457)	$ (456)	$ (471)	$ (474)
Loans held for investment \| Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	50,050		46,267
Loans held for sale \| Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	255		184
SBL
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	18,497		16,233
SBL \| Loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	18,497		16,233
Allowance for credit losses	(6)	(7)	(6)	(5)	(6)	(7)
SBL \| Loans held for investment \| Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	18,497		16,233
C&I loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	10,754		9,953
C&I loans \| Loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	10,754		9,953
Allowance for credit losses	(181)	(171)	(173)	(170)	(196)	(214)
C&I loans \| Loans held for investment \| Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	10,754		9,953
CRE loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	7,777		7,615
CRE loans \| Loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	7,777		7,615
Allowance for credit losses	(180)	(181)	(188)	(197)	(181)	(161)
CRE loans \| Loans held for investment \| Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	7,777		7,615
REIT loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	1,735		1,716
REIT loans \| Loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	1,735		1,716
Allowance for credit losses	(36)	(32)	(23)	(20)	(19)	(16)
REIT loans \| Loans held for investment \| Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	1,735		1,716
Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	9,976		9,412
Residential mortgage loans \| Loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	9,976		9,412
Allowance for credit losses	(61)	(60)	(65)	(62)	(67)	(74)
Residential mortgage loans \| Loans held for investment \| Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	9,976		9,412
Tax-exempt loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	1,311		1,338
Tax-exempt loans \| Loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	1,311		1,338
Allowance for credit losses	(1)	$ (1)	(2)	$ (2)	$ (2)	$ (2)
Tax-exempt loans \| Loans held for investment \| Nonrelated party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	$ 1,311		$ 1,338