LOANS AND LEASES - Non-Performing Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 48	$ 48
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	78	79
Troubled debt restructurings	20	21
Total non-performing loans	98	100
Other real estate owned	34	35
Total non-performing assets	$ 132	$ 135
Non-performing loans / total loans and leases	0.43%	0.45%
Non-performing loans OREO / total loans and leases OREO	0.58%	0.61%
Non-performing assets / total assets	0.39%	0.41%