LOANS AND LEASES - Non-Performing Assets (Detail) - USD ($) $ in Millions	Mar. 31, 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	134	81
Troubled debt restructurings	0	22
Total non-performing loans	134	103
Other real estate owned	20	26
Total non-performing assets	$ 154	$ 129
Non-performing loans / total loans and leases	0.56%	0.44%
Non-performing loans OREO / total loans and leases OREO	0.64%	0.55%
Non-performing assets / total assets	0.44%	0.37%