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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Balance    
Money market and savings accounts $ 34,132 $ 33,881
Interest-bearing demand deposits 25,254 22,532
Certificates of deposit 3,326 1,937
Non-interest-bearing demand deposits 607 547
Total bank deposits $ 63,319 $ 58,897
Weighted-average rate    
Money market and savings accounts 1.33% 1.60%
Interest-bearing demand deposits 3.52% 3.86%
Certificates of deposit 3.92% 4.21%
Non-interest-bearing demand deposits 0.00% 0.00%
Total bank deposits 2.35% 2.56%