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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Sep. 30, 2022
Bank deposits:    
Money market and savings accounts $ 43,136 $ 44,446
Interest-bearing demand deposits 7,809 5,286
Certificates of deposit 2,656 999
Non-interest-bearing demand deposits 628 626
Total bank deposits $ 54,229 $ 51,357
Weighted-average rate    
Money market and savings accounts 1.24% 1.01%
Interest-bearing demand deposits 4.45% 2.77%
Certificates of deposit 4.15% 1.85%
Non-interest-bearing demand deposits 0.00% 0.00%
Total bank deposits 1.86% 1.21%