Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI $ 166 $ 105
Loans held for sale [1] 693 804
Long-term debt 9,400 8,625
Held-to-maturity securities 8,747 8,565
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 74,315 74,128
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 166 105
Loans held for sale 696 806
Available-for-sale securities 13,982 13,780
Long-term debt 9,610 8,718
Held-to-maturity securities 8,591 8,286
Other Securities 486 565
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 74,160 73,668
Level 1 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 77 78
Loans held for sale 0  
Available-for-sale securities 5 5
Long-term debt 0 0
Held-to-maturity securities 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 0 0
Level 2 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 89 27
Loans held for sale 523 613
Available-for-sale securities 10,740 10,610
Long-term debt 9,016 8,158
Held-to-maturity securities 8,591 8,286
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 50 49
Level 3 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 0 0
Loans held for sale 173 193
Available-for-sale securities 3,237 3,165
Long-term debt 594 560
Held-to-maturity securities 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 74,110 73,619
Nonrecurring Basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans   (33)
Other real estate owned   $ (20)
Nonrecurring Basis | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Impaired loans (49)  
Other real estate owned (6)  
Nonrecurring Basis | Total Gains/(Losses)    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 0  
Other real estate owned (4)  
Nonrecurring Basis | Level 1 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 0  
Other real estate owned 0  
Nonrecurring Basis | Level 2 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 0  
Other real estate owned 0  
Nonrecurring Basis | Level 3 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Impaired loans (49)  
Other real estate owned $ (6)  
[1] Amounts represent loans for which Huntington has elected the fair value option.