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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Balance    
Money market and savings accounts $ 30,963 $ 32,268
Interest-bearing demand deposits 20,411 18,376
Certificates of deposit 2,562 2,831
Non-interest-bearing demand deposits 465 724
Total bank deposits $ 54,401 $ 54,199
Weighted-average rate    
Money market and savings accounts 2.23% 1.85%
Interest-bearing demand deposits 5.00% 4.98%
Certificates of deposit 4.70% 4.41%
Non-interest-bearing demand deposits 0.00% 0.00%
Total bank deposits 3.39% 3.06%