COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Other Commitments [Line Items]
Commitment amount	$ 98,713	$ 95,413
Commitments to extend credit
Other Commitments [Line Items]
Commitment amount	96,668	93,460
Letters of credit
Other Commitments [Line Items]
Commitment amount	1,910	1,845
Loans sold with recourse
Other Commitments [Line Items]
Commitment amount	93	93
Risk participation agreements
Other Commitments [Line Items]
Commitment amount	30	1
Other commitments
Other Commitments [Line Items]
Commitment amount	$ 12	$ 14