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VARIABLE INTEREST ENTITIES - 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
Variable Interest Entity            
Lending to special purpose entities included in loans and leases $ 124,071 $ 124,071   $ 124,071   $ 119,088
Purchases of debt securities available for sale 813     5,547 $ 4,633  
Special Purpose Entities | Commitments to extend credit            
Variable Interest Entity            
Commitment amount 1,300 1,300   1,300   1,200
Special Purpose Entities | Commercial            
Variable Interest Entity            
Lending to special purpose entities included in loans and leases 1,173 1,173   1,173   1,101
LIHTC Investments            
Variable Interest Entity            
Net impairment losses recognized in earnings   0 $ 0 0 $ 0  
Retail            
Variable Interest Entity            
Lending to special purpose entities included in loans and leases 61,709 61,709   61,709   61,550
Retail | Education            
Variable Interest Entity            
Lending to special purpose entities included in loans and leases 11,631 11,631   11,631   $ 10,347
Sale of loans 973 $ 973   $ 973    
Gain on sale of loans $ 32