LOANS AND LEASES - Non-Performing Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 94	$ 56
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	178	81
Troubled debt restructurings	0	22
Total non-performing loans	178	103
Other real estate owned	20	26
Non Performing Assets	$ 198	$ 129
Non-performing loans / total loans and leases	0.69%	0.44%
Non-performing assets + 90 days past due + OREO / total loans and leases + OREO	0.84%	0.73%
Past due	90 days	90 days