FAIR VALUES OF ASSETS AND LIABILITIES (Tables)

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FAIR VALUES OF ASSETS AND LIABILITIES (Tables)	3 Months Ended
	Mar. 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 Assets and liabilities measured at fair value on a recurring basis at March 31, 2018 and December 31, 2017 are summarized below:   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   March 31, 2018 (dollar amounts in millions) Level 1   Level 2   Level 3     Assets                   Trading account securities:                   Municipal securities $ —   $ 2   —   —   $ 2 Other securities 82   1   —   —   83   82   3   —   —   85 Available-for-sale securities:                   U.S. Treasury securities 5   —   —   —   5 Residential CMOs —   7,531   —   —   7,531 Residential MBS —   724   —   —   724 Commercial MBS —   1,791   —   —   1,791 Other agencies —   187   —   —   187 Municipal securities —   604   3,230   —   3,834 Asset-backed securities —   427   —   —   427 Corporate debt —   102   —   —   102 Other securities/sovereign debt —   6   —   —   6   5   11,372   3,230   —   14,607 Other securities 21   —   —   —   21 Loans held for sale —   426   —   —   426 Loans held for investment —   49   37   —   86 MSRs —   —   12   —   12 Derivative assets —   350   6   (269 )   87 Liabilities                   Derivative liabilities —   433   6   (282 )   157 Short-term borrowings 1   —   —   —   1   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.
Rollforward of financial instruments measured on a recurring basis and classified as Level 3	Level 3 Fair Value Measurements Three Months Ended March 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 into Level 3 —   —   —   —   — Transfers out of Level 3 (1) —   (5 )   —   —   — Total gains/losses for the period:                   Included in earnings 1   6   (1 )   (2 )   — Included in OCI —   —   (28 )   11   — Purchases/originations —   —   193   —   — Sales —   —   —   (33 )   — Repayments —   —   —   —   (1 ) Settlements —   —   (101 )   —   — Closing balance $ 12   $ —   $ 3,230   $ —   $ 37 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ 1   $ —   $ —   $ —   $ —   Level 3 Fair Value Measurements Three Months Ended March 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 into Level 3 —   —   —   —   — Transfers out of Level 3 (1) —   —   —   —   — Total gains/losses for the period:                   Included in earnings (1 )   5   (1 )   —   — Included in OCI —   —   20   3   — Purchases/originations —   —   133   —   — Sales —   —     (19 )   — Repayments —   —   —   —   (4 ) Settlements —   —   (82 )   (1 )   — Closing balance $ 13   $ 3   $ 2,868   $ 59   $ 44 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ —   $ 5   $ 20   $ 1   $ — (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.
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 three-month periods ended March 31, 2018 and 2017:   Level 3 Fair Value Measurements Three Months Ended March 31, 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 $ 1   $ 6   $ —   $ —   $ — Securities gains (losses) —   —   —   (2 )   — Other expense —   —   (1 )   —   — Total $ 1   $ 6   $ (1 )   $ (2 )   $ —   Level 3 Fair Value Measurements Three Months Ended March 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 $ (1 )   $ 5   $ —   $ —   $ — Securities gains (losses) —   —   (1 )   —   — Total $ (1 )   $ 5   $ (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:   March 31, 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 $ 426   $ 416   $ 10   $ 1   $ 1   $ — Loans held for investment 86   94   (8 )   8   9   (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 periods ended March 31, 2018 and 2017.     Net gains (losses) from fair value changes (dollar amounts in millions)   Three Months Ended March 31, Assets   2018   2017 Loans held for sale   $ (2 )   $ 9 Loans held for investment   —   —
Assets measured at fair value on a nonrecurring basis	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) Three Months Ended March 31, 2018 Impaired loans 58   —   —   58   — Other real estate owned 30   —   —   30   —
Quantitative information about significant unobservable level 3 fair value measurement inputs	Quantitative Information about Level 3 Fair Value Measurements at March 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 $ 12   Discounted cash flow   Constant prepayment rate   6% - 31% (9%)           Spread over forward interest rate swap rates   5% - 11% (8%) Derivative assets 6   Consensus Pricing   Net market price   -5% - 20% (2%)           Estimated Pull through %   0% - 100% (85%) Derivative liabilities 6   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   3/31/2018 - 06/30/2020 Municipal securities 3,230   Discounted cash flow   Discount rate   0% - 9% (3%)           Cumulative default   0% - 64% (3%)           Loss given default   5% - 90% (25%) Loans held for investment 37   Discounted cash flow   Discount rate   7% - 18% (8%)           Constant prepayment rate   2% - 22% (8%) Measured at fair value on a nonrecurring basis: Impaired loans 58   Appraisal value   NA   NA Other real estate owned 30   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
Carrying amounts and estimated fair values of financial instruments	The following table provides the carrying amounts and estimated fair values of Huntington’s financial instruments at March 31, 2018 and December 31, 2017:   March 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 1,115   —   —   1,115   1,115 Trading account securities —   —   85   85   85 Available-for-sale securities —   —   14,607   14,607   14,607 Held-to-maturity securities 8,789   —   —   8,789   8,550 Other securities 581   —   21   602   602 Loans held for sale —   80   426   506   510 Net loans and direct financing leases (1) 70,356   —   86   70,442   69,820 Derivatives —   —   87   87   87 Financial Liabilities                   Deposits 79,471   —   —   79,471   79,425 Short-term borrowings 2,854   —   —   2,854   2,854 Long-term debt 8,618   —   —   8,618   8,771 Derivatives —   —   157   157   157 (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 March 31, 2018 and December 31, 2017:   Estimated Fair Value Measurements at Reporting Date Using   March 31, 2018 (dollar amounts in millions) Level 1   Level 2   Level 3   Financial Assets               Trading account securities $ 82   $ 3   $ —   $ 85 Available-for-sale securities 5   11,372   3,230   14,607 Held-to-maturity securities —   8,550   —   8,550 Other securities 21   —   —   21 Loans held for sale —   426   84   510 Net loans and direct financing leases —   —   69,820   69,820 Financial Liabilities               Deposits —   74,573   4,852   79,425 Short-term borrowings 1   —   2,853   2,854 Long-term debt —   8,299   472   8,771   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