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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Commitments [Line Items]    
Commitment amount $ 76,580 $ 75,040
Commitments to extend credit    
Other Commitments [Line Items]    
Commitment amount 74,160 72,743
Letters of credit    
Other Commitments [Line Items]    
Commitment amount 2,239 2,190
Risk participation agreements    
Other Commitments [Line Items]    
Commitment amount 98 37
Loans sold with recourse    
Other Commitments [Line Items]    
Commitment amount 54 37
Marketing rights    
Other Commitments [Line Items]    
Commitment amount $ 29 $ 33