LOANS AND LEASES - Non-Performing Assets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 92	$ 88
Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	92	88
Total non-performing loans	92	88
Other real estate owned	10	8
Total non-performing assets	$ 102	$ 96
Non-performing loans / total loans and leases	0.33%	0.35%
Non-performing assets + 90 days past due / total loans and leases + OREO	0.39%	0.41%
Past due	90 days	90 days