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AVAILABLE-FOR-SALE SECURITIES, Narrative (Details)
$ in Millions
12 Months Ended
Sep. 30, 2021
USD ($)
investmentPosition
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of available-for-sale securities $ 969 $ 222 $ 0
Raymond James Bank      
Debt Securities, Available-for-sale [Line Items]      
Accrued interest on available-for-sale securities $ 14 15  
Average expected duration, available for sale securities 4 years    
Raymond James Bank | Agency MBS and agency CMOs      
Debt Securities, Available-for-sale [Line Items]      
Number of available-for-sale investment positions determined to be in an unrealized loss position | investmentPosition 276    
Number of available-for-sale investment positions determined to be in an unrealized loss position continuously for less than 12 months | investmentPosition 239    
Number of available-for-sale investment positions determined to be in an unrealized loss position continuously for 12 months or more | investmentPosition 37    
Proceeds from sales of available-for-sale securities $ 969 $ 222  
Raymond James Bank | Federal National Mortgage Association (FNMA)      
Debt Securities, Available-for-sale [Line Items]      
Amortized cost basis 5,170    
Raymond James Bank | Federal Home Loan Mortgage Corporation (FHLMC)      
Debt Securities, Available-for-sale [Line Items]      
Amortized cost basis $ 2,900