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BANK DEPOSITS, Maturities by Fiscal Year of Certificates of Deposit (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Sep. 30, 2025
Deposits [Abstract]    
Remainder of 2026 $ 1,357  
2027 400  
2028 119  
2029 49  
2030 39  
Thereafter 10  
Certificates of deposit $ 1,974 $ 1,937