COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Commitment amount	$ 94,148	$ 86,351
Commitments to extend credit
Other Commitments [Line Items]
Commitment amount	91,778	84,206
Letters of credit
Other Commitments [Line Items]
Commitment amount	2,101	1,998
Risk participation agreements
Other Commitments [Line Items]
Commitment amount	14	39
Loans sold with recourse
Other Commitments [Line Items]
Commitment amount	232	82
Marketing rights
Other Commitments [Line Items]
Commitment amount	$ 23	$ 26