BENEFIT PLANS - Defined Contribution Plans (Details) - USD ($) $ in Millions |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Retirement Benefits [Abstract] | ||
| Shares in Huntington common stock (in shares) | 10,121 | 10,334 |
| Market value of Huntington common stock | $ 128 | $ 156 |
| Dividends received on shares of Huntington stock | $ 6 | $ 6 |
| X | ||||||||||
- Definition Defined Contribution Plan, Amount of Employer and Related Party Securities Included in Plan Assets No definition available.
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| X | ||||||||||
- Definition Defined Contribution Plan, Dividends Received on Employer and Related Party Securities Included in Plan Assets No definition available.
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| X | ||||||||||
- Definition Defined Contribution Plan, Number of Shares of Equity Securities Issued by Employer and Related Parties Included in Plan Assets No definition available.
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| X | ||||||||||
- References No definition available.
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