v3.25.2
OTHER BORROWINGS, Subordinated Notes (Details) - Subordinated notes due 2030 - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Subordinated note, carrying value $ 99 $ 99
Subordinated Debt    
Debt Instrument [Line Items]    
Debt Instrument, face amount $ 98  
Stated interest rate (as a percent) 5.75%  
Spread on variable interest rate (as a percent) 5.62%  
Redemption price percentage (as a percent) 100.00%