COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Commitment amount	$ 98,168	$ 98,314
Commitments to extend credit
Other Commitments [Line Items]
Commitment amount	95,965	96,076
Letters of credit
Other Commitments [Line Items]
Commitment amount	2,079	2,119
Risk participation agreements
Other Commitments [Line Items]
Commitment amount	4	4
Loans sold with recourse
Other Commitments [Line Items]
Commitment amount	97	92
Marketing rights
Other Commitments [Line Items]
Commitment amount	$ 23	$ 23