COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Other Commitments [Line Items]
Commitment amount	$ 96,089	$ 95,413
Commitments to extend credit
Other Commitments [Line Items]
Commitment amount	94,106	93,460
Letters of credit
Other Commitments [Line Items]
Commitment amount	1,875	1,845
Loans sold with recourse
Other Commitments [Line Items]
Commitment amount	91	93
Marketing rights
Other Commitments [Line Items]
Commitment amount	12	14
Risk participation agreements
Other Commitments [Line Items]
Commitment amount	$ 5	$ 1