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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Balance    
Money market and savings accounts $ 33,881 $ 32,304
Interest-bearing demand deposits 22,532 20,570
Certificates of deposit 1,937 2,612
Non-interest-bearing demand deposits 547 524
Total bank deposits $ 58,897 $ 56,010
Weighted-average rate    
Money market and savings accounts 1.60% 2.18%
Interest-bearing demand deposits 3.86% 4.56%
Certificates of deposit 4.21% 4.70%
Non-interest-bearing demand deposits 0.00% 0.00%
Total bank deposits 2.56% 3.18%