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
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Securities $ 85 $ 86
Loans held for sale [1] 709 488
Available-for-sale securities 14,070 14,869
Long-term debt 9,726 9,206
Held-to-maturity securities 8,682 9,091
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 71,665 69,426
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Securities 85 86
Loans held for sale 713 491
Available-for-sale securities 14,070 14,869
Long-term debt 9,889 9,402
Held-to-maturity securities 8,391 8,971
Other Securities 597 600
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 70,996 69,146
Level 1 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Securities 78  
Loans held for sale 0 0
Available-for-sale securities 6 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]    
Trading Securities 7  
Loans held for sale 643 413
Available-for-sale securities 10,886 11,673
Long-term debt 9,416 8,944
Held-to-maturity securities 8,391 8,971
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 50 0
Level 3 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Securities 0 0
Loans held for sale 70 78
Available-for-sale securities 3,178 3,191
Long-term debt 473 458
Held-to-maturity securities 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 70,946 69,146
Nonrecurring Basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans   (36)
Other real estate owned   (33)
Nonrecurring Basis | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Impaired loans (55)  
Other real estate owned (28)  
Nonrecurring Basis | Total Gains/(Losses)    
Assets measured at fair value on a nonrecurring basis    
Impaired loans 0  
Other real estate owned 1  
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    
Assets measured at fair value on a nonrecurring basis    
MSRs   $ 190
Nonrecurring Basis | Level 3 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Impaired loans (55)  
Other real estate owned $ (28)  
[1] Amounts represent loans for which Huntington has elected the fair value option.