LOANS AND LEASES - Loans and Leases, Net of Unearned Income (Detail) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	[1]	$ 32,323	$ 30,255
Total commercial loans and leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		20,496	19,290
Total commercial loans and leases | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		12,305	11,526
Total commercial loans and leases | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		7,482	7,131
Total commercial loans and leases | Commercial leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		599	519
Total commercial loans and leases | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		110	114
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		11,827	10,965
Total consumer loans | Direct installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		2,741	2,784
Total consumer loans | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		6,640	5,297
Total consumer loans | Indirect installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		1,149	1,553
Total consumer loans | Consumer lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		$ 1,297	$ 1,331

[1] Amount represents loans for which we have elected the fair value option. See Note 26.