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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Other Commitments [Line Items]    
Commitment amount $ 82,721 $ 76,580
Commitments to extend credit    
Other Commitments [Line Items]    
Commitment amount 80,629 74,160
Letters of credit    
Other Commitments [Line Items]    
Commitment amount 1,939 2,239
Risk participation agreements    
Other Commitments [Line Items]    
Commitment amount 57 98
Loans sold with recourse    
Other Commitments [Line Items]    
Commitment amount 70 54
Marketing rights    
Other Commitments [Line Items]    
Commitment amount $ 26 $ 29