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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Sep. 30, 2019
Bank deposits:    
Savings and money market accounts $ 24,106 $ 21,654
Certificates of deposit 1,088 605
NOW accounts 156 6
Demand deposits (non-interest-bearing) 22 16
Total bank deposits $ 25,372 $ 22,281
Weighted-average rate [Abstract]    
Savings and money market accounts, weighted-average rate (in hundredths) 0.01% 0.25%
Certificates of deposit, weighted-average rate (in hundredths) 1.98% 2.33%
NOW accounts, weighted-average rate (in hundredths) 1.92% 0.01%
Demand deposits (non-interest-bearing), weighted-average rate (in hundredths) 0.00% 0.00%
Total bank deposits, weighted-average rate (in hundredths) 0.11% 0.31%
Related party deposit liabilities $ 185 $ 163
Time deposit amount that exceeds FDIC insurance limit $ 47