FAIR VALUES OF ASSETS AND LIABILITIES (Tables)

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FAIR VALUES OF ASSETS AND LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
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.
Roll forward of derivatives measured on a recurring basis and classified as Level 3	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.
Roll forward of assets measured on a recurring basis and classified as Level 3	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.
Classification of gains and losses due to changes in fair value, recorded in earnings for Level 3 assets and liabilities	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 measured at fair value on a nonrecurring basis	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 )
Quantitative information about significant unobservable level 3 fair value measurement inputs	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 %
Fair value by balance sheet grouping	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.