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BANK DEPOSITS, Maturities by Fiscal Year of Certificates of Deposit (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Deposits [Abstract]    
Remainder of 2024 $ 508  
2025 1,743  
2026 268  
2027 20  
2028 15  
Thereafter 8  
Certificates of deposit $ 2,562 $ 2,831