FAIR VALUES OF ASSETS AND LIABILITIES

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FAIR VALUES OF ASSETS AND LIABILITIES	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUES OF ASSETS AND LIABILITIES	FAIR VALUES OF ASSETS AND LIABILITIES Following is a description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy. Loans held for sale Huntington has elected to apply the fair value option for mortgage loans originated with the intent to sell which are included in loans held for sale. Mortgage loans held for sale are classified as Level 2 and are estimated using security prices for similar product types. Loans held for investment Certain mortgage loans originated with the intent to sell for which the FVO was elected have been reclassified to mortgage loans held for investment. These loans continue to be measured at fair value. The fair value is determined using fair value of similar mortgage-backed securities adjusted for loan specific variables. Huntington elected the fair value option for consumer loans with deteriorated credit quality acquired from FirstMerit. These consumer loans are classified as Level 3. The key assumption used to determine the fair value of the consumer loans is discounted cash flows. Available-for-sale securities and trading account securities Securities accounted for at fair value include both the available-for-sale and trading portfolios. Huntington determines the fair value of securities utilizing quoted market prices obtained for identical or similar assets, third-party pricing services, third-party valuation specialists and other observable inputs such as recent trade observations. AFS and trading securities are classified as Level 1 using quoted market prices (unadjusted) in active markets for identical securities that Huntington has the ability to access at the measurement date. Less than 1% of the positions in these portfolios are Level 1, and consist of U.S. Treasury securities and money market mutual funds. When quoted market prices are not available, fair values are classified as Level 2 using quoted prices for similar assets in active markets, quoted prices of identical or similar assets in markets that are not active, and inputs that are observable for the asset, either directly or indirectly, for substantially the full term of the financial instrument. Level 2 represents 77% of the positions in these portfolios, which consists of U.S. Government and agency debt securities, agency mortgage backed securities, private-label asset-backed securities, certain municipal securities and other securities. For Level 2 securities Huntington primarily uses prices obtained from third-party pricing services to determine the fair value of securities. Huntington independently evaluates and corroborates the fair value received from pricing services through various methods and techniques, including references to dealer or other market quotes, by reviewing valuations of comparable instruments, and by comparing the prices realized on the sale of similar securities. If relevant market prices are limited or unavailable, valuations may require significant management judgment or estimation to determine fair value, in which case the fair values are classified as Level 3 which represent 23% of the positions. The Level 3 positions consist of direct purchase municipal securities. A significant change in the unobservable inputs for these securities may result in a significant change in the ending fair value measurement of these securities. The direct purchase municipal securities are classified as Level 3 and require significant estimates to determine fair value which results in greater subjectivity. The fair value is determined by utilizing a discounted cash flow valuation technique employed by a third-party valuation specialist. The third-party specialist uses assumptions related to yield, prepayment speed, conditional default rates and loss severity based on certain factors such as, credit worthiness of the counterparty, prevailing market rates, and analysis of similar securities. Huntington evaluates the fair values provided by the third-party specialist for reasonableness. MSRs MSRs do not trade in an active, open market with readily observable prices. Accordingly, the fair value of these assets is classified as Level 3. Huntington determines the fair value of MSRs using a discounted cash flow model based upon the month-end interest rate curve and prepayment assumptions. The model utilizes assumptions to estimate future net servicing income cash flows, including estimates of time decay, payoffs, and changes in valuation inputs and assumptions. Servicing brokers and other sources of information (e.g. discussion with other mortgage servicers and industry surveys) are used to obtain information on market practice and assumptions. On at least a quarterly basis, third-party marks are obtained from at least one servicing broker. Huntington reviews the valuation assumptions against this market data for reasonableness and adjusts the assumptions if deemed appropriate. Any recommended change in assumptions and/or inputs are presented for review to the Mortgage Price Risk Subcommittee for final approval. Derivative assets and liabilities Derivatives classified as Level 2 consist of foreign exchange and commodity contracts, which are valued using exchange traded swaps and futures market data. In addition, Level 2 includes interest rate contracts, which are valued using a discounted cash flow method that incorporates current market interest rates. Level 2 also includes exchange traded options and forward commitments to deliver mortgage-backed securities, which are valued using quoted prices. Derivatives classified as Level 3 consist of interest rate lock agreements related to mortgage loan commitments and Visa® shares swap. The determination of fair value includes assumptions related to the likelihood that a commitment will ultimately result in a closed loan, which is a significant unobservable assumption. A significant increase or decrease in the external market price would result in a significantly higher or lower fair value measurement. Assets and Liabilities measured at fair value on a recurring basis Assets and liabilities measured at fair value on a recurring basis at December 31, 2018 and 2017 are summarized below:   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   December 31, 2018 (dollar amounts in millions) Level 1   Level 2   Level 3     Assets                   Trading account securities:                   Municipal securities $ 1   $ 27   $ —   $ —   $ 28 Other securities 77   —   —   —   77   78   27   —   —   105 Available-for-sale securities:                   U.S. Treasury securities 5   —   —   —   5 Residential CMOs —   6,999   —   —   6,999 Residential MBS —   1,255   —   —   1,255 Commercial MBS —   1,583   —   —   1,583 Other agencies —   126   —   —   126 Municipal securities —   275   3,165   —   3,440 Asset-backed securities —   315   —   —   315 Corporate debt —   53   —   —   53 Other securities/Sovereign debt —   4   —   —   4   5   10,610   3,165   —   13,780                     Other securities $ 22   $ —   $ —   $ —   $ 22 Loans held for sale —   613   —   —   613 Loans held for investment —   49   30   —   79 MSRs —   —   10   —   10 Derivative assets 21   474   5   (291 )   209 Liabilities                   Derivative liabilities 11   390   3   (217 )   187   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 years ended December 31, 2018, 2017, and 2016 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 Year Ended December 31, 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 out of Level 3 (1) —   (35 )   —   —   — Total gains/losses for the period:                   Included in earnings (1 )   35   (3 )   (2 )   — Included in OCI —   —   (52 )   11   — Purchases/originations —   —   658   —   — Sales —   —   —   (33 )   — Repayments —   —   —   —   (8 ) Settlements —   3   (605 )   —   — Closing balance $ 10   $ 2   $ 3,165   $ —   $ 30 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (1 )   $ —   $ —   $ —   $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period $ —   $ —   $ (52 )   $ —   $ —   Level 3 Fair Value Measurements Year Ended December 31, 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 out of Level 3 (1) —   (15 )   —   —   — Total gains/losses for the period:                   Included in earnings (3 )   16   (2 )   (5 )   1 Included in OCI —   —   (8 )   14   — Purchases/originations —   —   787   —   — Sales —   —   —   (60 )   — Repayments —   —   —   —   (11 ) Settlements —   —   (408 )   (1 )   — Closing balance $ 11   $ (1 )   $ 3,167   $ 24   $ 38 Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date $ (3 )   $ —   $ —   $ (4 )   $ —   Level 3 Fair Value Measurements Year Ended December 31, 2016           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Asset- backed securities   Loans held for investment Opening balance $ 18   $ 6   $ 2,095   $ 100   $ 2 Transfers out of Level 3 (1) —   (7 )   —   —   — Total gains/losses for the period:                   Included in earnings (4 )   (1 )   7   (2 )   (2 ) Included in OCI —   —   (28 )   6   — Purchases/originations —   —   1,399   —   56 Sales —   —   (37 )   (25 )   — Repayments —   —   —   —   (8 ) Settlements —   —   (638 )   (3 )   — Closing balance $ 14   $ (2 )   $ 2,798   $ 76   $ 48 Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date $ (4 )   $ (1 )   $ (33 )   $ 4   $ — (1) Transfers out of Level 3 represent the settlement value of the derivative instruments (i.e. interest rate lock agreements) that are 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 years ended December 31, 2018, 2017, and 2016:   Level 3 Fair Value Measurements Year Ended December 31, 2018           Available-for-sale securities (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Asset- backed securities Classification of gains and losses in earnings:               Mortgage banking income $ (1 )   $ 35   $ —   $ — Securities gains (losses) —   —   —   (2 ) Interest and fee income —   —   (3 )   — Total $ (1 )   $ 35   $ (3 )   $ (2 )   Level 3 Fair Value Measurements Year Ended December 31, 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 $ (3 )   $ 16   $ —   $ —   $ — Securities gains (losses) —   —   —   (5 )   — Interest and fee income —   —   (2 )   —   — Noninterest income —   —   —   —   1 Total $ (3 )   $ 16   $ (2 )   $ (5 )   $ 1   Level 3 Fair Value Measurements Year Ended December 31, 2016           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 (loss) $ (4 )   $ (1 )   $ —   $ —   $ — Securities gains (losses) —   —   1   (2 )   — Noninterest income —   —   6   —   (2 ) Total $ (4 )   $ (1 )   $ 7   $ (2 )   $ (2 ) Assets and liabilities under the fair value option The following table presents the fair value and aggregate principal balance of certain assets and liabilities under the fair value option:    December 31, 2018   Total Loans   Loans that are 90 or more days past due (dollar amounts in millions) Fair value carrying amount   Aggregate unpaid principal   Difference   Fair value carrying amount   Aggregate unpaid principal   Difference Assets                       Loans held for sale $ 613   $ 594   $ 19   $ —   $ —   $ — Loans held for investment 79   87   (8 )   6   7   (1 )   December 31, 2017   Total Loans   Loans that are 90 or more days past due (dollar amounts in millions) Fair value carrying amount   Aggregate unpaid principal   Difference   Fair value carrying amount   Aggregate unpaid principal   Difference Assets                       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 years ended December 31, 2018, 2017, and 2016:    Net gains (losses) from fair value changes Year Ended December 31, (dollar amounts in millions) 2018   2017   2016 Assets           Loans held for sale $ 5   $ 8   $ 7 Loans held for investment —   —   — 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. The amounts presented represent the fair value on the various measurement dates throughout the period. The gains(losses) represent the amounts recorded during the period regardless of whether the asset is still held at period end. The amounts measured at fair value on a nonrecurring basis at December 31, 2018 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) Year Ended December 31, 2018 Impaired loans 33   —   —   33   (1 ) Other real estate owned 20   —   —   20   (7 ) Loans held for sale 145   —   —   145   (11 ) 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. Periodically, 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 other assets and valued based on appraisals and third-party price opinions. The appraisals supporting the fair value of the collateral to recognize loan impairment or unrealized loss on other real estate owned properties may not have been obtained as of December 31, 2018. Loans held for sale are measured at lower of cost or fair value less costs to sell. The fair value of loans held for sale is determined based on discounted cash flows or based on the fair value of the underlying collateral supporting the loan. 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 December 31, 2018 and 2017:   Quantitative Information about Level 3 Fair Value Measurements at December 31, 2018 (dollar amounts in millions) Fair Value   Valuation Technique   Significant Unobservable Input   Range   Weighted  Average Measured at fair value on a recurring basis:                 MSRs $ 10   Discounted cash flow   Constant prepayment rate   6  % - 54 %   8 %           Spread over forward interest rate swap rates   5  % - 11 %   8 % Derivative assets 5   Consensus Pricing   Net market price   (5 )% - 23 %   2 %           Estimated Pull through %   1  % - 100 %   92 % Derivative liabilities 3   Discounted cash flow   Estimated conversion factor           163 %           Estimated growth rate of Visa Class A shares           7 %            Discount rate           4 %           Timing of the resolution of the litigation           6/30/2020 Municipal securities 3,165   Discounted cash flow   Discount rate   4  % - 4 %   4 %           Cumulative default   —  % - 39 %   3 %           Loss given default   5  % - 90 %   25 % Loans held for investment 30   Discounted cash flow   Discount rate   7  % - 9 %   9 %           Constant prepayment rate   9  % - 9 %   9 % Measured at fair value on a nonrecurring basis:                 Impaired loans 33   Appraisal value   NA           NA Other real estate owned 20   Appraisal value   NA           NA Loans held for sale 121   Discounted cash flow   Discount rate   5  %   6 %   5 %   24   Appraisal value   NA           N/A   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   —  % - 10 %   4 %           Cumulative default   —  % - 64 %   3 %           Loss given default   5  % - 90 %   24 % Asset-backed securities 24   Discounted cash flow   Discount rate   7  %   7 %   7 %           Cumulative prepayment rate   —  %   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 % 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. 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 December 31, 2018 and December 31, 2017:   December 31, 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 2,725   —   —   2,725   2,725 Trading account securities —   —   105   105   105 Available-for-sale securities —   —   13,780   13,780   13,780 Held-to-maturity securities 8,565   —   —   8,565   8,286 Other securities 543   —   22   565   565 Loans held for sale —   191   613   804   806 Net loans and leases (1) 74,049   —   79   74,128   73,668 Derivatives —   —   209   209   209 Financial Liabilities                   Deposits 84,774   —   —   84,774   84,731 Short-term borrowings 2,017   —   —   2,017   2,017 Long-term debt 8,625   —   —   8,625   8,718 Derivatives —   —   187   187   187   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 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 December 31, 2018 and December 31, 2017:   Estimated Fair Value Measurements at Reporting Date Using   December 31, 2018 (dollar amounts in millions) Level 1   Level 2   Level 3   Financial Assets               Trading account securities $ 78   $ 27   $ —   $ 105 Available-for-sale securities 5   10,610   3,165   13,780 Held-to-maturity securities —   8,286   —   8,286 Other securities (1) 22   —   —   22 Loans held for sale —   613   193   806 Net loans and direct financing leases —   49   73,619   73,668 Financial Liabilities               Deposits —   76,922   7,809   84,731 Short-term borrowings 1   —   2,016   2,017 Long-term debt —   8,158   560   8,718   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 (1) 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 (1) Excludes securities without readily determinable fair values. 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, interest-bearing deposits at Federal Reserve Bank, 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.