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BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Bank deposits:    
Savings and money market accounts $ 26,702 $ 25,604
Certificates of deposit 912 1,017
NOW accounts 158 156
Demand deposits (non-interest-bearing) 18 24
Total bank deposits $ 27,790 $ 26,801
Weighted-average rate [Abstract]    
Savings and money market accounts, weighted-average rate (in hundredths) 0.01% 0.01%
Certificates of deposit, weighted-average rate (in hundredths) 1.93% 1.94%
NOW accounts, weighted-average rate (in hundredths) 1.90% 1.92%
Demand deposits (non-interest-bearing), weighted-average rate (in hundredths) 0.00% 0.00%
Total bank deposits, weighted-average rate (in hundredths) 0.08% 0.09%
Related party deposit liabilities $ 185 $ 185
Time deposit amount that exceeds FDIC insurance limit $ 22