LOANS AND LEASES - Summary of Loans and Leases, Net of Unearned Income (Detail) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	[1]	$ 30,255	$ 24,968
Total commercial loans and leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		19,290	16,465
Total commercial loans and leases | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		11,526	9,899
Total commercial loans and leases | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		7,131	5,977
Total commercial loans and leases | Commercial leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		519	495
Total commercial loans and leases | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		114	94
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		10,965	8,503
Total consumer loans | Direct installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		2,784	2,376
Total consumer loans | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		5,297	3,654
Total consumer loans | Indirect installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		1,553	1,227
Total consumer loans | Consumer lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		$ 1,331	$ 1,246

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