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SECURITIES - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]            
Accrued interest receivable on debt securities $ 57 $ 57   $ 57   $ 58
Taxable interest income from securities   121 $ 153 398 $ 483  
Purchases of debt securities available for sale 813     5,547 4,633  
Mortgage-backed securities            
Debt Securities, Available-for-sale [Line Items]            
Securitizations of mortgage loans   34 $ 28 34 $ 72  
Retail | Education            
Debt Securities, Available-for-sale [Line Items]            
Sale of loans $ 973 $ 973   $ 973