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BANK DEPOSITS, Bank Deposits by Insured and Uninsured (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Deposits [Abstract]    
FDIC-insured bank deposits $ 52,461 $ 49,117
Bank deposits exceeding FDIC insurance limit 10,858 9,780
Total bank deposits $ 63,319 $ 58,897
FDIC-insured bank deposits as a % of total bank deposits 83.00% 83.00%
Related Party Transaction [Line Items]    
Bank deposits exceeding FDIC insurance limit $ 10,858 $ 9,780
Related party    
Deposits [Abstract]    
Bank deposits exceeding FDIC insurance limit 1,340 1,240
Related Party Transaction [Line Items]    
Bank deposits exceeding FDIC insurance limit $ 1,340 $ 1,240