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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Balance    
Money market and savings accounts $ 32,268 $ 44,446
Interest-bearing demand deposits 18,376 5,286
Certificates of deposit 2,831 999
Non-interest-bearing demand deposits 724 626
Total bank deposits $ 54,199 $ 51,357
Weighted-average rate    
Money market and savings accounts 1.85% 1.01%
Interest-bearing demand deposits 4.98% 2.77%
Certificates of deposit 4.41% 1.85%
Non-interest-bearing demand deposits 0.00% 0.00%
Total bank deposits 3.06% 1.21%