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BANK LOANS, NET, Collateral-dependent loans (Details) - Total loans held for investment - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
C&I loans | Commercial real estate and other business assets    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Amortized cost of loans $ 31 $ 13
CRE loans | Office, multi-family residential, retail, hospitality, and industrial real estate    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Amortized cost of loans 302 165
CRE loans | Office Building [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Amortized cost of loans 0 113
Residential mortgage loans | Single family homes    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Amortized cost of loans $ 3 $ 9