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AVAILABLE-FOR-SALE SECURITIES, Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
position
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
position
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Duration, available for sale securities     3 years    
Available-for-sale securities $ 5,630,000,000   $ 5,630,000,000   $ 3,093,000,000
Proceeds from sales of available-for-sale securities 222,000,000 $ 0 222,000,000 $ 0  
Federal National Mortgage Association (FNMA)          
Debt Securities, Available-for-sale [Line Items]          
Amortized cost basis 3,780,000,000   3,780,000,000    
Available-for-sale securities 3,860,000,000   3,860,000,000    
Federal Home Loan Mortgage Corporation (FHLMC)          
Debt Securities, Available-for-sale [Line Items]          
Amortized cost basis 1,440,000,000   1,440,000,000    
Available-for-sale securities 1,470,000,000   1,470,000,000    
RJ Bank          
Debt Securities, Available-for-sale [Line Items]          
Amortized cost basis 5,512,000,000   5,512,000,000   3,065,000,000
Available-for-sale securities $ 5,630,000,000   $ 5,630,000,000   $ 3,093,000,000
RJ Bank | Agency mortgage-backed securities (“MBS”) and collateralized mortgage obligations (“CMOs”)          
Debt Securities, Available-for-sale [Line Items]          
Number of available-for-sale investment positions determined to be in an unrealized loss position | position 26   26