v3.26.1
BANK LOANS, NET, Collateral-dependent loans (Details) - Total loans held for investment - USD ($)
$ in Millions
Mar. 31, 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 $ 17 $ 13
CRE loans | Office, hospitality, industrial, multi-family residential, and medical office real estate    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Amortized cost of loans 278 165
CRE loans | Office real estate    
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 $ 4 $ 9