Huntington Bancshares Incorporated Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Narrative (Details)

v3.19.3.a.u2

BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Employer Contributions		$ 0
Defined Contribution Plan, Cost		51	$ 46	$ 35
Defined Benefit Plan, Plan Assets, Amount	$ 931	931	828
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations in excess of plan assets, aggregate projected benefit obligation	$ 8	8
Defined benefit plan expenses		3	2	2
Estimated net periodic pension cost in next fiscal year		4
Average duration of plan assets investment in bonds, years	15 years 10 months 24 days
Estimated life of benefit obligations	13 years
Defined Benefit Plan, Plan Assets, Amount	$ 931	$ 931	$ 828	$ 903
Pension Benefits \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	17.00%
Pension Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	82.00%	82.00%
Pension Benefits \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	1.00%	1.00%
Minimum \| Pension Benefits \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%	20.00%
Minimum \| Pension Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%	50.00%
Maximum \| Pension Benefits \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%	50.00%
Maximum \| Pension Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	80.00%	80.00%

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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