v3.26.1
BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Sep. 30, 2025
Balance    
Money market and savings accounts $ 37,532 $ 33,881
Interest-bearing demand deposits 22,032 22,532
Certificates of deposit 2,320 1,937
Non-interest-bearing demand deposits 539 547
Total bank deposits $ 62,423 $ 58,897
Weighted-average rate    
Money market and savings accounts 1.30% 1.60%
Interest-bearing demand deposits 3.38% 3.86%
Certificates of deposit 3.90% 4.21%
Non-interest-bearing demand deposits 0.00% 0.00%
Total bank deposits 2.14% 2.56%