Huntington Bancshares Incorporated Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans by Loan Class (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 417	$ 340
Commercial \| Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	271	188
Commercial \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	9	15
Consumer \| Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	4	5
Consumer \| Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	64	62
Consumer \| Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	68	69
Consumer \| RV and Marine FInance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	1	1
Consumer \| Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 0	$ 0