Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Defined Contribution Plans (Details)

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BENEFIT PLANS - Defined Contribution Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Defined contribution plan $ 46 $ 35 $ 36
Shares in Huntington common stock (in shares) 11,635 13,566  
Market value of Huntington common stock $ 139 $ 198  
Dividends received on shares of Huntington stock $ 6 $ 4