FAIR VALUES OF ASSETS AND LIABILITIES (Tables)

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FAIR VALUES OF ASSETS AND LIABILITIES (Tables)	6 Months Ended
	Jun. 30, 2020
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 June 30, 2020 and December 31, 2019 are summarized below:   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   June 30, 2020 (dollar amounts in millions) Level 1   Level 2   Level 3     Assets                   Trading account securities:                   Municipal securities $ —   $ 45   $ —   $ —   $ 45 Available-for-sale securities:                   U.S. Treasury securities 8   —   —   —   8 Residential CMOs —   5,118   —   —   5,118 Residential MBS —   3,838   —   —   3,838 Commercial MBS —   788   —   —   788 Other agencies —   147   —   —   147 Municipal securities —   55   3,102   —   3,157 Private-label CMO —   —   5   —   5 Asset-backed securities —   155   56   —   211 Corporate debt —   21   —   —   21 Other securities/sovereign debt —   4   —   —   4   8   10,126   3,163   —   13,297 Other securities 56   —   —   —   56 Loans held for sale —   954   —   —   954 Loans held for investment —   67   25   —   92 MSRs —   —   172   —   172 Derivative assets —   2,278   43   (1,214 )   1,107 Liabilities                   Derivative liabilities —   1,276   3   (1,107 )   172   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   December 31, 2019 (dollar amounts in millions) Level 1   Level 2   Level 3     Assets                   Trading account securities:                   Federal agencies: Other agencies $ —   $ 4   $ —   $ —   $ 4 Municipal securities —   63   —   —   63 Other securities 30   2   —   —   32   30   69   —   —   99 Available-for-sale securities:                   U.S. Treasury securities 10   —   —   —   10 Residential CMOs —   5,085   —   —   5,085 Residential MBS —   4,222   —   —   4,222 Commercial MBS —   976   —   —   976 Other agencies —   165   —   —   165 Municipal securities —   56   2,999   —   3,055 Private-label CMO —   —   2   —   2 Asset-backed securities —   531   48   —   579 Corporate debt —   51   —   —   51 Other securities/sovereign debt —   4   —   —   4   10   11,090   3,049   —   14,149 Other securities 54   —   —   —   54 Loans held for sale —   781   —   —   781 Loans held for investment —   55   26   —   81 MSRs —   —   7   —   7 Derivative assets —   848   8   (404 )   452 Liabilities                   Derivative liabilities —   519   2   (417 )   104 (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	The tables below present a rollforward of the balance sheet amounts for the three-month and six-month periods ended June 30, 2020 and 2019, 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, 2020           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Private- label CMO   Asset-backed securities   Loans held for investment Opening balance $ 165   $ 39   $ 2,937   $ 2   $ 69   $ 26 Transfers out of Level 3 (1) —   (55 )   —   —   —   — Total gains/losses for the period:                       Included in earnings 7   56   —   —   —   — Included in OCI —   —   69   —   —   — Purchases/originations —   —   264   3   —   — Repayments —   —   —   —   —   (1 ) Settlements —   —   (168 )   —   (13 )   — Closing balance $ 172   $ 40   $ 3,102   $ 5   $ 56   $ 25 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ 7   $ —   $ —   $ —   $ —   $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period —   —   (20 )   —   —   —                           Level 3 Fair Value Measurements Three Months Ended June 30, 2019   MSRs   Derivative instruments   Available-for-sale securities   Loans held for investment (dollar amounts in millions)     Municipal securities   Opening balance $ 10   $ 5   $ 3,237   $ 29 Transfers out of Level 3 (1) —   (15 )   —   — Total gains/losses for the period:               Included in earnings (1 )   19   (1 )   — Included in OCI —   —   3   — Purchases/originations —   —   28   — Repayments —   —   —   (1 ) Settlements —   —   (65 )   — Closing balance $ 9   $ 9   $ 3,202   $ 28 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (1 )   $ 4   $ —   $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period $ —   $ —   3   $ —   Level 3 Fair Value Measurements Six Months Ended June 30, 2020           Available-for-sale securities     (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Private- label CMO   Asset-backed securities   Loans held for investment Opening balance $ 7   $ 6   $ 2,999   $ 2   $ 48   $ 26 Fair value election for servicing assets previously measured using the amortized method 205   —   —   —   —   — Transfers out of Level 3 (1) —   (75 )   —   —   —   — Total gains/losses for the period:                       Included in earnings (40 )   109   (1 )   —   —   — Included in OCI —   —   1   —   —   — Purchases/originations —   —   338   3   28   — Repayments —   —   —   —   —   (1 ) Settlements —   —   (235 )   —   (20 )   — Closing balance $ 172   $ 40   $ 3,102   $ 5   $ 56   $ 25 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (40 )   $ 34   $ —   $ —   $ —   $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period —   —   2   —   —   —   Level 3 Fair Value Measurements Six Months Ended June 30, 2019           Available-for-sale securities   Loans held for investment (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities   Opening balance $ 10   $ 2   $ 3,165   $ 30 Transfers out of Level 3 (1) —   (24 )   —   — Total gains/losses for the period:               Included in earnings (1 )   31   —   — Included in OCI —   —   46   — Purchases/originations —   —   108   — Repayments —   —   —   (2 ) Settlements —   —   (117 )   — Closing balance $ 9   $ 9   $ 3,202   $ 28 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (1 )   $ 6   $ —   $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period —   —   46   — (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 and six-month periods ended June 30, 2020 and 2019:               Level 3 Fair Value Measurements Three Months Ended June 30, 2020           Available-for-sale securities (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities Classification of gains and losses in earnings:           Mortgage banking income $ 7   $ 56   $ — Interest and fee income —   —   — Total $ 7   $ 56   $ —               Level 3 Fair Value Measurements Three Months Ended June 30, 2019           Available-for-sale securities (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities Classification of gains and losses in earnings:           Mortgage banking income $ (1 )   $ 19   $ — Interest and fee income —   —   (1 ) Total $ (1 )   $ 19   $ (1 )   Level 3 Fair Value Measurements Six Months Ended June 30, 2020           Available-for-sale securities (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities Classification of gains and losses in earnings:           Mortgage banking income $ (40 )   $ 109   $ — Interest and fee income —   —   (1 ) Total $ (40 )   $ 109   $ (1 )   Level 3 Fair Value Measurements Six Months Ended June 30, 2019           Available-for-sale securities (dollar amounts in millions) MSRs   Derivative instruments   Municipal securities Classification of gains and losses in earnings:           Mortgage banking income $ (1 )   $ 31   $ — Interest and fee income —   —   — Total $ (1 )   $ 31   $ —
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, 2020 (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 $ 954   $ 906   $ 48   $ 1   $ 1   $ — Loans held for investment 92   97   (5 )   4   4   —   December 31, 2019 (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 $ 781   $ 755   $ 26   $ 2   $ 2   $ — Loans held for investment 81   87   (6 )   3   4   (1 ) The following tables present the net gains (losses) from fair value changes for the three-month and six-month periods ended June 30, 2020 and 2019.     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   2020   2019   2020   2019 Loans held for sale (1)   $ 3   $ 8   $ 22   $ 6 (1) The net gains (losses) from fair value changes are included in Mortgage banking income on the Unaudited Condensed Consolidated Statements of Income.
Assets measured at fair value on a nonrecurring basis	The amounts measured at fair value on a nonrecurring basis at June 30, 2020 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, 2020 Collateral-dependent loans 116   —   —   116   (38 ) Loans held for sale 76   —   —   76   (45 )
Quantitative information about significant unobservable level 3 fair value measurement inputs	Quantitative Information about Level 3 Fair Value Measurements at June 30, 2020 (1) (dollar amounts in millions) Fair Value   Valuation Technique   Significant Unobservable Input   Range   Weighted Average Measured at fair value on a recurring basis: MSRs $ 172   Discounted cash flow   Constant prepayment rate   10  % - 26%   17 %           Spread over forward interest rate swap rates   5  % - 11%   8 % Derivative assets 43   Consensus Pricing   Net market price   (3 )% - 14%   4 %           Estimated Pull through %   4  % - 100%   88 % Municipal securities 3,102   Discounted cash flow   Discount rate   2  % - 2%   2 % Asset-backed securities 56       Cumulative default   0  % - 39%   4 %           Loss given default   5  % - 80%   24 % Measured at fair value on a nonrecurring basis: Collateral-dependent loans 116   Appraisal value   NA           NA (1) Certain disclosures related to quantitative level 3 fair value measurements do not include those deemed to be immaterial.   Quantitative Information about Level 3 Fair Value Measurements at December 31, 2019 (1) (dollar amounts in millions) Fair Value   Valuation Technique   Significant Unobservable Input   Range   Weighted Average Measured at fair value on a recurring basis:         MSRs $ 7   Discounted cash flow   Constant prepayment rate   —  % - 26%   8 %           Spread over forward interest rate swap rates   5  % - 11%   8 % Derivative assets 8   Consensus Pricing   Net market price   (2 )% - 11%   2 %           Estimated Pull through %   2  % - 100%   91 % Municipal securities 2,999   Discounted cash flow   Discount rate   2  % - 3%   2 % Asset-backed securities 48       Cumulative default   —  % - 39%   4 %           Loss given default   5  % - 80%   24 % Measured at fair value on a nonrecurring basis:         MSRs 206   Discounted cash flow   Constant prepayment rate   10  % - 31%   12 %           Spread over forward interest rate swap rates   5  % - 11%   9 % Impaired loans 26   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 June 30, 2020 and December 31, 2019:   June 30, 2020 (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 $ 6,375   $ —   $ —   $ 6,375   $ 6,375 Trading account securities —   —   45   45   45 Available-for-sale securities —   —   13,297   13,297   13,297 Held-to-maturity securities 9,416   —   —   9,416   9,856 Other securities 382   —   56   438   438 Loans held for sale —   211   954   1,165   1,167 Net loans and leases (1) 78,345   —   92   78,437   79,502 Derivative assets —   —   1,107   1,107   1,107 Financial Liabilities                   Deposits 93,691   —   —   93,691   93,702 Short-term borrowings 146   —   —   146   146 Long-term debt 9,753   —   —   9,753   9,992 Derivative liabilities —   —   172   172   172   December 31, 2019 (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 $ 1,272   $ —   $ —   $ 1,272   $ 1,272 Trading account securities —   —   99   99   99 Available-for-sale securities —   —   14,149   14,149   14,149 Held-to-maturity securities 9,070   —   —   9,070   9,186 Other securities 387   —   54   441   441 Loans held for sale —   96   781   877   879 Net loans and leases (1) 74,540   —   81   74,621   75,177 Derivative assets —   —   452   452   452 Financial Liabilities                   Deposits 82,347   —   —   82,347   82,344 Short-term borrowings 2,606   —   —   2,606   2,606 Long-term debt 9,849   —   —   9,849   10,075 Derivative liabilities —   —   104   104   104 (1) Includes collateral-dependent loans. The following table presents the level in the fair value hierarchy for the estimated fair values at June 30, 2020 and December 31, 2019:   Estimated Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)  June 30, 2020 (dollar amounts in millions) Level 1   Level 2   Level 3   Financial Assets                 Trading account securities $ —   $ 45   $ —     $ 45 Available-for-sale securities 8   10,126   3,163     13,297 Held-to-maturity securities —   9,856   —     9,856 Other securities (2) 56   —   —     56 Loans held for sale —   954   213     1,167 Net loans and direct financing leases —   67   79,435     79,502 Derivative assets —   2,278   43   $ (1,214 ) 1,107 Financial Liabilities                 Deposits —   90,153   3,549     93,702 Short-term borrowings —   —   146     146 Long-term debt —   9,374   618     9,992 Derivative liabilities —   1,276   3   (1,107 ) 172   Estimated Fair Value Measurements at Reporting Date Using   Netting Adjustments (1) December 31, 2019 (dollar amounts in millions) Level 1   Level 2   Level 3   Financial Assets                 Trading account securities $ 30   $ 69   $ —     $ 99 Available-for-sale securities 10   11,090   3,049     14,149 Held-to-maturity securities —   9,186   —     9,186 Other securities (2) 54   —   —     54 Loans held for sale —   781   98     879 Net loans and direct financing leases —   55   75,122     75,177 Derivative assets —   848   8   $ (404 ) 452 Financial Liabilities           Deposits —   76,790   5,554     82,344 Short-term borrowings —   —   2,606     2,606 Long-term debt —   9,439   636     10,075 Derivative liabilities —   519   2   (417 ) 104