BANK DEPOSITS, Summary of Bank Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Bank deposits:
Savings and money market accounts	$ 33,103	$ 31,415
Certificates of deposit	789	878
NOW accounts	164	164
Demand deposits (non-interest-bearing)	36	38
Total bank deposits	$ 34,092	$ 32,495
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)	1.89%	1.87%
NOW accounts, weighted-average rate (in hundredths)	1.84%	1.84%
Demand deposits (non-interest-bearing), weighted-average rate (in hundredths)	0.00%	0.00%
Total bank deposits, weighted-average rate (in hundredths)	0.06%	0.07%
Related Party Transaction [Line Items]
Related party deposit liabilities	$ 302	$ 301
Time deposit amount that exceeds FDIC insurance limit	43
Raymond James Financial Inc
Related Party Transaction [Line Items]
Related party deposit liabilities	229
Raymond James Trust Company of New Hampshire
Related Party Transaction [Line Items]
Related party deposit liabilities	$ 73

Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

No definition available.