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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Commitment amount	$ 78,435	$ 76,580
Commitments to extend credit
Other Commitments [Line Items]
Commitment amount	76,200	74,160
Letters of credit
Other Commitments [Line Items]
Commitment amount	2,077	2,239
Risk participation agreements
Other Commitments [Line Items]
Commitment amount	71	98
Loans sold with recourse
Other Commitments [Line Items]
Commitment amount	58	54
Marketing rights
Other Commitments [Line Items]
Commitment amount	$ 29	$ 29