FAIR VALUE, Investments in Private Equity Measured at Net Asset Value Per Share (Details) - Private equity investments - Recurring - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Private equity investments measured at NAV	$ 82	$ 94
Private equity investments not measured at NAV	75	75
Total private equity investments	157	169
Total equity attributable to Raymond James Financial, Inc.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Total private equity investments	115	120
Unfunded commitment	8	8
Noncontrolling interests
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Total private equity investments	$ 42	$ 49