LOANS AND LEASES - Non-Performing Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 128	$ 170
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	128	170
Total non-performing loans	128	170
Other real estate owned	9	10
Non Performing Assets	$ 137	$ 180
Non-performing loans / total loans and leases	0.51%	0.67%
Non-performing assets + 90 days past due + OREO / total loans and leases + OREO	0.57%	0.77%
Past due	90 days	90 days