FAIR VALUES OF ASSETS AND LIABILITIES

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FAIR VALUES OF ASSETS AND LIABILITIES	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
FAIR VALUES OF ASSETS AND LIABILITIES	FAIR VALUES OF ASSETS AND LIABILITIES See Note 18 “Fair Value of Assets and Liabilities” to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2017 for a description of the valuation methodologies used for instruments measured at fair value. Assets and liabilities measured at fair value rarely transfer between Level 1 and Level 2 measurements. There were no such transfers during the three-month and six-month periods ended June 30, 2018 and 2017. Assets and Liabilities measured at fair value on a recurring basis Assets and liabilities measured at fair value on a recurring basis at June 30, 2018 and December 31, 2017 are summarized below:   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   June 30, 2018 (dollar amounts in millions) Level 1   Level 2   Level 3     Assets                   Trading account securities:                   Municipal securities $ —   $ 5   $ —   $ —   $ 5 Other securities 78   2   —   —   80   78   7   —   —   85 Available-for-sale securities:                   U.S. Treasury securities 6   —   —   —   6 Residential CMOs —   7,250   —   —   7,250 Residential MBS —   659   —   —   659 Commercial MBS —   1,743   —   —   1,743 Other agencies —   183   —   —   183 Municipal securities —   587   3,178   —   3,765 Asset-backed securities —   373   —   —   373 Corporate debt —   87   —   —   87 Other securities/sovereign debt —   4   —   —   4   6   10,886   3,178   —   14,070 Other securities 21   —   —   —   21 Loans held for sale —   643   —   —   643 Loans held for investment —   50   34   —   84 MSRs —   —   11   —   11 Derivative assets —   446   8   (275 )   179 Liabilities                   Derivative liabilities —   399   7   (204 )   202   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   December 31, 2017 (dollar amounts in millions) Level 1   Level 2   Level 3     Assets                   Trading account securities:                   Other securities $ 83   $ 3   $ —   $ —   $ 86   83   3   —   —   86 Available-for-sale securities:                   U.S. Treasury securities 5   —   —   —   5 Residential CMOs —   6,484   —   —   6,484 Residential MBS —   1,367   —   —   1,367 Commercial MBS —   2,487   —   —   2,487 Other agencies —   70   —   —   70 Municipal securities —   711   3,167   —   3,878 Asset-backed securities —   443   24   —   467 Corporate debt —   109   —   —   109 Other securities/sovereign debt —   2   —   —   2   5   11,673   3,191   —   14,869 Other securities 19   —   —   —   19 Loans held for sale —   413   —   —   413 Loans held for investment —   55   38   —   93 MSRs —   —   11   —   11 Derivative assets —   316   6   (190 )   132 Liabilities                   Derivative liabilities —   326   5   (245 )   86 (1) Amounts represent the impact of legally enforceable master netting agreements that allow the Company to settle positive and negative positions and cash collateral held or placed with the same counterparties. The tables below present a rollforward of the balance sheet amounts for the three-month and six-month periods ended June 30, 2018 and 2017, for financial instruments measured on a recurring basis and classified as Level 3. The classification of an item as Level 3 is based on the significance of the unobservable inputs to the overall fair value measurement. However, Level 3 measurements may also include observable components of value that can be validated externally. Accordingly, the gains and losses in the table below include changes in fair value due in part to observable factors that are part of the valuation methodology.   Level 3 Fair Value Measurements Three Months Ended June 30, 2018           Available-for-sale securities   (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Loans held for investment Opening balance $ 12   $ —   $ 3,230   $ 37 Transfers into Level 3 —   —   —   — Transfers out of Level 3 (1) —   (9 )   —   — Total gains/losses for the period:               Included in earnings (1 )   10   (1 )   — Included in OCI —   —   (9 )   — Purchases/originations —   —   86   — Sales —   —   —   — Repayments —   —   —   (3 ) Settlements —   —   (128 )   — Closing balance $ 11   $ 1   $ 3,178   $ 34 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (1 )   $ 2   $ —   $ —   Level 3 Fair Value Measurements Three Months Ended June 30, 2017           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Asset-backed securities   Loans held for investment Opening balance $ 13   $ 3   $ 2,868   $ 59   $ 44 Transfers into Level 3 —   —   —   —   — Transfers out of Level 3 (1) —   (2 )   —   —   — Total gains/losses for the period:                   Included in earnings —   2   (1 )   (3 )   2 Included in OCI —   —   12   6   — Purchases/originations —   —   115   —   — Sales —   —   —   (19 )   — Repayments —   —   —   —   (2 ) Settlements —   —   (122 )   —   — Closing balance $ 13   $ 3   $ 2,872   $ 43   $ 44 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ —   $ 3   $ 12   $ 6   $ — (1) Transfers out of Level 3 represent the settlement value of the derivative instruments (i.e. interest rate lock agreements) that is transferred to loans held for sale, which is classified as Level 2.   Level 3 Fair Value Measurements Six Months Ended June 30, 2018           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Asset-backed securities   Loans held for investment Opening balance $ 11   $ (1 )   $ 3,167   $ 24   $ 38 Transfers into Level 3 —   —   —   —   — Transfers out of Level 3 (1) —   (14 )   —   —   — Total gains/losses for the period:                   Included in earnings —   16   (2 )   (2 )   — Included in OCI —   —   (37 )   11   — Purchases/originations —   —   279   —   — Sales —   —   —   (33 )   — Repayments —   —   —   —   (4 ) Settlements —   —   (229 )   —   — Closing balance $ 11   $ 1   $ 3,178   $ —   $ 34 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ —   $ 2   $ —   $ —   $ —   Level 3 Fair Value Measurements Six Months Ended June 30, 2017           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Asset- backed securities   Loans held for investment Opening balance $ 14   $ (2 )   $ 2,798   $ 76   $ 48 Transfers into Level 3 —   —   —   —   — Transfers out of Level 3 (1) —   (3 )   —   —   — Total gains/losses for the period:                   Included in earnings (1 )   8   (3 )   (3 )   1 Included in OCI —   —   33   9   — Purchases/originations —   —   248   —   — Sales —   —   —   (38 )   — Repayments —   —   —   —   (5 ) Settlements —   —   (204 )   (1 )   — Closing balance $ 13   $ 3   $ 2,872   $ 43   $ 44 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (1 )   $ 8   $ 33   $ 9   $ —                     (1) Transfers out of Level 3 represent the settlement value of the derivative instruments (i.e. interest rate lock agreements) that is transferred to loans held for sale, which is classified as Level 2. The tables below summarize the classification of gains and losses due to changes in fair value, recorded in earnings for Level 3 assets and liabilities for the three-month and six-month periods ended June 30, 2018 and 2017:   Level 3 Fair Value Measurements Three Months Ended June 30, 2018           Available-for-sale securities   (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Loans held for investment Classification of gains and losses in earnings:               Mortgage banking income $ (1 )   $ 10   $ —   $ — Securities gains (losses) —   —   —   — Other expense —   —   (1 )   — Total $ (1 )   $ 10   $ (1 )   $ —   Level 3 Fair Value Measurements Three Months Ended June 30, 2017           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Asset-backed securities   Loans held for investment Classification of gains and losses in earnings:                   Mortgage banking income $ —   $ 2   $ —   $ —   $ — Securities gains (losses) —   —   (1 )   (3 )   — Noninterest income —   —   —   —   2 Total $ —   $ 2   $ (1 )   $ (3 )   $ 2   Level 3 Fair Value Measurements Six Months Ended June 30, 2018           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Asset-backed securities   Loans held for investment Classification of gains and losses in earnings:                   Mortgage banking income $ —   $ 16   $ —   $ —   $ — Securities gains (losses) —   —   —   (2 )   — Other expense —   —   (2 )   —   — Total $ —   $ 16   $ (2 )   $ (2 )   $ —                       Level 3 Fair Value Measurements Six Months Ended June 30, 2017           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Asset-backed securities   Loans held for investment Classification of gains and losses in earnings:                   Mortgage banking income $ (1 )   $ 8   $ —   $ —   $ — Securities gains (losses) —   —   (3 )   (3 )   — Noninterest income —   —   —   —   1 Total $ (1 )   $ 8   $ (3 )   $ (3 )   $ 1                     Assets and liabilities under the fair value option The following tables present the fair value and aggregate principal balance of certain assets and liabilities under the fair value option:   June 30, 2018 (dollar amounts in millions) Total Loans   Loans that are 90 or more days past due Assets Fair value carrying amount   Aggregate unpaid principal   Difference   Fair value carrying amount   Aggregate unpaid principal   Difference Loans held for sale $ 643   $ 625   $ 18   $ —   $ —   $ — Loans held for investment 84   93   (9 )   7   8   (1 )   December 31, 2017 (dollar amounts in millions) Total Loans   Loans that are 90 or more days past due Assets Fair value carrying amount   Aggregate unpaid principal   Difference   Fair value carrying amount   Aggregate unpaid principal   Difference Loans held for sale $ 413   $ 400   $ 13   $ 1   $ 1   $ — Loans held for investment 93   102   (9 )   10   11   (1 ) The following tables present the net gains (losses) from fair value changes for the three-month and six-month periods ended June 30, 2018 and 2017.   Net gains (losses) from fair value changes   Net gains (losses) from fair value changes (dollar amounts in millions) Three Months Ended June 30,   Six Months Ended June 30, Assets 2018   2017   2018   2017 Loans held for sale $ 5   $ 5   $ 3   $ 14 Loans held for investment —   2   —   1 Assets and Liabilities measured at fair value on a nonrecurring basis Certain assets and liabilities may be required to be measured at fair value on a nonrecurring basis in periods subsequent to their initial recognition. These assets and liabilities are not measured at fair value on an ongoing basis; however, they are subject to fair value adjustments in certain circumstances, such as when there is evidence of impairment. For the six months ended June 30, 2018, assets measured at fair value on a nonrecurring basis were as follows:       Fair Value Measurements Using     (dollar amounts in millions) Fair Value   Quoted Prices In Active Markets for Identical Assets (Level 1)   Significant Other Observable Inputs (Level 2)   Significant Other Unobservable Inputs (Level 3)   Total Gains/(Losses) Six Months Ended June 30, 2018 Impaired loans 55   —   —   55   — Other real estate owned 28   —   —   28   (1 ) Periodically, Huntington records nonrecurring adjustments of collateral-dependent loans measured for impairment when establishing the ALLL. Such amounts are generally based on the fair value of the underlying collateral supporting the loan. Appraisals are generally obtained to support the fair value of the collateral and incorporate measures such as recent sales prices for comparable properties and cost of construction. In cases where the carrying value exceeds the fair value of the collateral less cost to sell, an impairment charge is recognized. Other real estate owned properties are included in accrued income and other assets and valued based on appraisals and third-party price opinions. Significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis The table below presents quantitative information about the significant unobservable inputs for assets and liabilities measured at fair value on a recurring and nonrecurring basis at June 30, 2018 and December 31, 2017:   Quantitative Information about Level 3 Fair Value Measurements at June 30, 2018 (dollar amounts in millions) Fair Value   Valuation Technique   Significant Unobservable Input   Range (Weighted Average) Measured at fair value on a recurring basis: MSRs $ 11   Discounted cash flow   Constant prepayment rate   6% - 44% (8%)           Spread over forward interest rate swap rates   5% - 11% (8%) Derivative assets 8   Consensus Pricing   Net market price   -5% - 8% (2%)           Estimated Pull through %   2% - 100% (90%) Derivative liabilities 7   Discounted cash flow   Estimated conversion factor   163 %           Estimated growth rate of Visa Class A shares   7 %            Discount rate   3 %           Timing of the resolution of the litigation   06/30/2020 Municipal securities 3,178   Discounted cash flow   Discount rate   0% - 9% (4%)           Cumulative default   0% - 64% (4%)           Loss given default   5% - 90% (25%) Loans held for investment 34   Discounted cash flow   Discount rate   7% - 19% (8%)           Constant prepayment rate   2% - 22% (9%) Measured at fair value on a nonrecurring basis: Impaired loans 55   Appraisal value   NA   NA Other real estate owned 28   Appraisal value   NA   NA   Quantitative Information about Level 3 Fair Value Measurements at December 31, 2017 (dollar amounts in millions) Fair Value   Valuation Technique   Significant Unobservable Input   Range (Weighted Average) Measured at fair value on a recurring basis: MSRs $ 11   Discounted cash flow   Constant prepayment rate   8% - 33% (12%)           Spread over forward interest rate swap rates   8% - 10% (8%) Derivative assets 6   Consensus Pricing   Net market price   -5% - 20% (2%)           Estimated Pull through %   3% - 100% (75%) Derivative liabilities 5   Discounted cash flow   Estimated conversion factor   165%           Estimated growth rate of Visa Class A shares   7%            Discount rate   3%           Timing of the resolution of the litigation   12/31/2017 - 06/30/2020 Municipal securities 3,167   Discounted cash flow   Discount rate   0% - 10% (4%)           Cumulative default   0% - 64% (3%)           Loss given default   5% - 90% (24%) Asset-backed securities 24   Discounted cash flow   Discount rate   7% - 7% (7%)           Cumulative prepayment rate   0% - 72% (7%)           Cumulative default   3% - 53% (7%)           Loss given default   90% - 100% (98%)           Cure given deferral   50% - 50% (50%) Loans held for investment 38   Discounted cash flow   Discount rate   7% - 18% (8%)           Constant prepayment rate   2% - 22% (9%) Measured at fair value on a nonrecurring basis: MSRs 190   Discounted cash flow   Constant prepayment rate   6% - 21% (8%)           Spread over forward interest rate swap rates   2% - 20% (10%) Impaired loans 36   Appraisal value   NA   NA Other real estate owned 33   Appraisal value   NA   NA The following provides a general description of the impact of a change in an unobservable input on the fair value measurement and the interrelationship between unobservable inputs, where relevant/significant. Interrelationships may also exist between observable and unobservable inputs. Such relationships have not been included in the discussion below. A significant change in the unobservable inputs may result in a significant change in the ending fair value measurement of Level 3 instruments. In general, prepayment rates increase when market interest rates decline and decrease when market interest rates rise and higher prepayment rates generally resulting in lower fair values for MSR assets and asset-backed securities. Credit loss estimates, such as probability of default, constant default, cumulative default, loss given default, cure given deferral, and loss severity, are driven by the ability of the borrowers to pay their loans and the value of the underlying collateral and are impacted by changes in macroeconomic conditions, typically increasing when economic conditions worsen and decreasing when conditions improve. An increase in the estimated prepayment rate typically results in a decrease in estimated credit losses and vice versa. Higher credit loss estimates generally result in lower fair values. Credit spreads generally increase when liquidity risks and market volatility increase and decrease when liquidity conditions and market volatility improve. Discount rates and spread over forward interest rate swap rates typically increase when market interest rates increase and/or credit and liquidity risks increase, and decrease when market interest rates decline and/or credit and liquidity conditions improve. Higher discount rates and credit spreads generally result in lower fair market values. Net market price and pull through percentages generally increase when market interest rates increase and decline when market interest rates decline. Higher net market price and pull through percentages generally result in higher fair values. Fair values of financial instruments The following table provides the carrying amounts and estimated fair values of Huntington’s financial instruments at June 30, 2018 and December 31, 2017:   June 30, 2018 (dollar amounts in millions) Amortized Cost   Lower of Cost or Market   Fair Value or Fair Value Option   Total Carrying Amount   Estimated Fair Value Financial Assets                   Cash and short-term assets 1,423   —   —   1,423   1,423 Trading account securities —   —   85   85   85 Available-for-sale securities —   —   14,070   14,070   14,070 Held-to-maturity securities 8,682   —   —   8,682   8,391 Other securities 576   —   21   597   597 Loans held for sale —   66   643   709   713 Net loans and direct financing leases (1) 71,581   —   84   71,665   70,996 Derivatives —   —   179   179   179 Financial Liabilities                   Deposits 79,587   —   —   79,587   79,534 Short-term borrowings 2,442   —   —   2,442   2,442 Long-term debt 9,726   —   —   9,726   9,889 Derivatives —   —   202   202   202 (1) Includes collateral-dependent loans measured for impairment.   December 31, 2017 (dollar amounts in millions) Amortized Cost   Lower of Cost or Market   Fair Value or Fair Value Option   Total Carrying Amount   Estimated Fair Value Financial Assets                   Cash and short-term assets 1,567   —   —   $ 1,567   $ 1,567 Trading account securities —   —   86   86   86 Available-for-sale securities —   —   14,869   14,869   14,869 Held-to-maturity securities 9,091   —   —   9,091   8,971 Other securities 581   —   19   600   600 Loans held for sale —   75   413   488   491 Net loans and direct financing leases (1) 69,333   —   93   69,426   69,146 Derivatives —   —   132   132   132 Financial Liabilities                   Deposits 77,041   —   —   77,041   77,010 Short-term borrowings 5,056   —   —   5,056   5,056 Long-term debt 9,206   —   —   9,206   9,402 Derivatives —   —   86   86   86 (1) Includes collateral-dependent loans measured for impairment. The following table presents the level in the fair value hierarchy for the estimated fair values at June 30, 2018 and December 31, 2017:   Estimated Fair Value Measurements at Reporting Date Using   June 30, 2018 (dollar amounts in millions) Level 1   Level 2   Level 3   Financial Assets               Trading account securities $ 78   $ 7   $ —   $ 85 Available-for-sale securities 6   10,886   3,178   14,070 Held-to-maturity securities —   8,391   —   8,391 Other securities 21   —   —   21 Loans held for sale —   643   70   713 Net loans and direct financing leases —   50   70,946   70,996 Financial Liabilities               Deposits —   73,371   6,163   79,534 Short-term borrowings 2   —   2,440   2,442 Long-term debt —   9,416   473   9,889   Estimated Fair Value Measurements at Reporting Date Using   December 31, 2017 (dollar amounts in millions) Level 1   Level 2   Level 3   Financial Assets               Trading account securities $ 83   $ 3   $ —   $ 86 Available-for-sale securities 5   11,673   3,191   14,869 Held-to-maturity securities —   8,971   —   8,971 Other securities 19   —   —   19 Loans held for sale —   413   78   491 Net loans and direct financing leases —   —   69,146   69,146 Financial Liabilities         Deposits —   73,975   3,035   77,010 Short-term borrowings —   —   5,056   5,056 Long-term debt —   8,944   458   9,402 The short-term nature of certain assets and liabilities result in their carrying value approximating fair value. These include trading account securities, customers’ acceptance liabilities, short-term borrowings, bank acceptances outstanding, FHLB advances, and cash and short-term assets, which include cash and due from banks, interest-bearing deposits in banks, and federal funds sold and securities purchased under resale agreements. Loan commitments and letters-of-credit generally have short-term, variable-rate features and contain clauses that limit Huntington’s exposure to changes in customer credit quality. Accordingly, their carrying values, which are immaterial at the respective balance sheet dates, are reasonable estimates of fair value. Certain assets, the most significant being operating lease assets, bank owned life insurance, and premises and equipment, do not meet the definition of a financial instrument and are excluded from this disclosure. Similarly, mortgage and nonmortgage servicing rights, deposit base, and other customer relationship intangibles are not considered financial instruments and are not included above. Accordingly, this fair value information is not intended to, and does not, represent Huntington’s underlying value. Many of the assets and liabilities subject to the disclosure requirements are not actively traded, requiring fair values to be estimated by Management. These estimations necessarily involve the use of judgment about a wide variety of factors, including but not limited to, relevancy of market prices of comparable instruments, expected future cash flows, and appropriate discount rates.