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BANK DEPOSITS, Maturities by Fiscal Year of Certificates of Deposit (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Deposits [Abstract]    
Remainder of 2026 $ 652  
2027 1,413  
2028 877  
2029 228  
2030 88  
Thereafter 68  
Certificates of deposit $ 3,326 $ 1,937