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
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI $ 83 $ 86
Loans held for sale [1] 792 488
Available-for-sale securities 13,727 14,869
Long-term debt 9,385 9,206
Held-to-maturity securities 8,465 9,091
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 72,609 69,426
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 83 86
Loans held for sale 795 491
Available-for-sale securities 13,727 14,869
Long-term debt 9,523 9,402
Held-to-maturity securities 8,112 8,971
Other Securities 565 600
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 71,918 69,146
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  
Loans held for sale 0 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 6  
Loans held for sale 727 413
Available-for-sale securities 10,445 11,673
Long-term debt 8,986 8,944
Held-to-maturity securities 8,112 8,971
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 49 0
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 68 78
Available-for-sale securities 3,277 3,191
Long-term debt 537 458
Held-to-maturity securities 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 71,869 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 (53)  
Other real estate owned (27)  
Nonrecurring Basis | Total Gains/(Losses)    
Assets measured at fair value on a nonrecurring basis    
Impaired loans (1)  
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 (53)  
Other real estate owned $ (27)  
[1] Amounts represent loans for which Huntington has elected the fair value option.