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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Bank deposits:    
Savings and money market accounts $ 28,715 $ 21,654
Certificates of deposit 1,150 605
NOW accounts 136 6
Demand deposits (non-interest-bearing) 22 16
Total bank deposits $ 30,023 $ 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) 1.99% 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) 0.09% 0.31%
Related party deposit liabilities $ 179 $ 163
Time deposit amount that exceeds FDIC insurance limit $ 65