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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Sep. 30, 2022
Bank deposits:    
Money market and savings accounts $ 33,636 $ 44,446
Interest-bearing demand deposits 16,661 5,286
Certificates of deposit 2,739 999
Non-interest-bearing demand deposits 732 626
Total bank deposits $ 53,768 $ 51,357
Weighted-average rate    
Money market and savings accounts 1.54% 1.01%
Interest-bearing demand deposits 4.86% 2.77%
Certificates of deposit 4.23% 1.85%
Non-interest-bearing demand deposits 0.00% 0.00%
Total bank deposits 2.72% 1.21%