LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES (Tables)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Asset and liability derivatives included in accrued income and other assets [Table Text Block]	December 31, 2017 December 31, 2016 (dollar amounts in millions) Asset   Liability   Asset   Liability Derivatives designated as Hedging Instruments               Interest rate contracts $ 22   $ 121   $ 46   $ 100 Derivatives not designated as Hedging Instruments               Interest rate contracts (1) 187   100   233   141 Foreign exchange contracts 18   18   23   20 Commodities contracts 92   87   108   104 Equity contracts 3   5   10   6 Total Contracts $ 322   $ 331   $ 420   $ 371 .
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period
Schedule of financing receivable portfolio segments
Lease financing receivables	Net investments in lease financing receivables by category at December 31, 2017 and 2016 were as follows:    At December 31, (dollar amounts in millions) 2017   2016 Commercial and industrial:       Lease payments receivable $ 1,645   $ 1,881 Estimated residual value of leased assets 755   798 Gross investment in commercial lease financing receivables 2,400   2,679 Deferred origination costs 18   13 Deferred fees (225 )   (254 ) Total net investment in commercial lease financing receivables $ 2,193   $ 2,438
Loans acquired with deteriorated credit quality	The following table presents a rollforward of the accretable yield for purchased credit impaired loans for the year ended December 31, 2017 and 2016:   At December 31, (dollar amounts in millions) 2017   2016 Balance, beginning of period $ 37   $ — Impact of acquisition/purchase on August 16, 2016 —   18 Accretion (18 )   (5 ) Reclassification from nonaccretable difference 14   24 Balance at December 31, $ 33   $ 37 The following table reflects the ending and unpaid balances of the purchased credit-impaired loans at December 31, 2017 and 2016:   December 31, 2017   December 31, 2016 (dollar amounts in millions) Ending Balance   Unpaid Principal Balance   Ending Balance   Unpaid Principal Balance Commercial and industrial $ 39   $ 61   $ 68   $ 100 Commercial real estate 2   15   34   56 Total $ 41   $ 76   $ 102   $ 156
Loan Purchases and Sales	Loan
Nonaccrual loans by loan class	The following table presents NALs by loan class at December 31, 2017 and 2016:    December 31, (dollar amounts in millions) 2017   2016 Commercial and industrial $ 161   $ 234 Commercial real estate 29   20 Automobile 6   6 Home equity 68   72 Residential mortgage 84   91 RV and marine finance 1   — Other consumer —   — Total nonaccrual loans $ 349   $ 423
Aging analysis of loans and leases	The following table presents an aging analysis of loans and leases, including past due loans and leases, by loan class at December 31, 2017 and 2016 (1):   December 31, 2017   Past Due       Purchased Credit Impaired    Loans Accounted for Under the Fair Value Option   Total Loans and Leases   90 or more days past due and accruing   (dollar amounts in millions) 30-59 Days   60-89  Days   90 or  more days Total   Current           Commercial and industrial $ 35   $ 14   $ 65   $ 114   $ 27,954   $ 39   $ —   $ 28,107   $ 9 (2) Commercial real estate 10   1   11   22   7,201   2   —   7,225   3   Automobile 89   18   10   117   11,982   —   1   12,100   7   Home equity 49   19   60   128   9,969   —   2   10,099   18   Residential mortgage 129   48   118   295   8,642   —   89   9,026   72   RV and marine finance 11   3   2   16   2,421   —   1   2,438   1   Other consumer 12   5   5   22   1,100   —   —   1,122   5   Total loans and leases $ 335   $ 108   $ 271   $ 714   $ 69,269   $ 41   $ 93   $ 70,117   $ 115     December 31, 2016   Past Due           Loans Accounted for Under the Fair Value Option   Total Loans and Leases   90 or more days past due and accruing   (dollar amounts in millions) 30-59 Days   60-89  Days   90 or  more days Total   Current   Purchased Credit Impaired         Commercial and industrial $ 42   $ 20   $ 74   $ 136   $ 27,855   68   —   $ 28,059   $ 18 (2) Commercial real estate 21   3   30   54   7,213   34   —   7,301   17   Automobile 76   17   10   103   10,864   —   2   10,969   10   Home equity 39   24   53   116   9,987   —   3   10,106   12   Residential mortgage 122   37   117   276   7,374   —   75   7,725   67   RV and marine finance 10   2   2   14   1,830   —   2   1,846   1   Other consumer 11   6   3   20   936   —   —   956   4   Total loans and leases $ 321   $ 109   $ 289   $ 719   $ 66,059   $ 102   $ 82   $ 66,962   $ 129   (1) NALs are included in this aging analysis based on the loan’s past due status. (2) Amounts include Huntington Technology Finance administrative lease delinquencies.
ALLL and AULC activity by portfolio segment	The following table presents ALLL and AULC activity by portfolio segment for the years ended December 31, 2017, 2016, and 2015: (dollar amounts in millions)   Commercial   Consumer   Total Year ended December 31, 2017:             ALLL balance, beginning of period   $ 451   $ 187   $ 638 Loan charge-offs   (72 )   (180 )   (252 ) Recoveries of loans previously charged-off   41   52   93 Provision for loan and lease losses   62   150   212 Allowance for loans sold or transferred to loans held for sale   —   —   — ALLL balance, end of period   $ 482   $ 209   $ 691 AULC balance, beginning of period   $ 87   $ 11   $ 98 Provision (reduction in allowance) for unfunded loan commitments and letters of credit   (3 )   (8 )   (11 ) AULC recorded at acquisition   —   —   — AULC balance, end of period   $ 84   $ 3   $ 87 ACL balance, end of period   $ 566   $ 212   $ 778               Year ended December 31, 2016:             ALLL balance, beginning of period   $ 399   $ 199   $ 598 Loan charge-offs   (92 )   (135 )   (227 ) Recoveries of loans previously charged-off   73   45   118 Provision for loan and lease losses   85   84   169 Allowance for loans sold or transferred to loans held for sale   (14 )   (6 )   (20 ) ALLL balance, end of period   $ 451   $ 187   $ 638 AULC balance, beginning of period   $ 64   $ 8   $ 72 Provision (reduction in allowance) for unfunded loan commitments and letters of credit   19   3   22 AULC recorded at acquisition   4   —   4 AULC balance, end of period   $ 87   $ 11   $ 98 ACL balance, end of period   $ 538   $ 198   $ 736               Year ended December 31, 2015:             ALLL balance, beginning of period   $ 390   $ 215   $ 605 Loan charge-offs   (98 )   (120 )   (218 ) Recoveries of loans previously charged-off   86   44   130 Provision for loan and lease losses   21   68   89 Allowance for loans sold or transferred to loans held for sale   —   (8 )   (8 ) ALLL balance, end of period   $ 399   $ 199   $ 598 AULC balance, beginning of period   $ 55   $ 6   $ 61 Provision (reduction in allowance) for unfunded loan commitments and letters of credit   9   2   11 AULC recorded at acquisition   —   —   — AULC balance, end of period   $ 64   $ 8   $ 72 ACL balance, end of period   $ 463   $ 207   $ 670
Loan and lease balances by credit quality indicator	The following table presents each loan and lease class by credit quality indicator at December 31, 2017 and 2016:   December 31, 2017   Credit Risk Profile by UCS Classification (dollar amounts in millions) Pass   OLEM   Substandard   Doubtful   Total Commercial and industrial $ 26,268   $ 694   $ 1,116   $ 29   $ 28,107 Commercial real estate 6,909   200   115   1   7,225   Credit Risk Profile by FICO Score (1), (2)   750+   650-749   <650   Other (3)   Total Automobile 6,102   4,312   1,390   295   12,099 Home equity 6,352   3,024   617   104   10,097 Residential mortgage 5,697   2,581   605   54   8,937 RV and marine finance 1,433   863   96   45   2,437 Other consumer 428   540   143   11   1,122   December 31, 2016   Credit Risk Profile by UCS Classification (dollar amounts in millions) Pass   OLEM   Substandard   Doubtful   Total Commercial and industrial $ 26,212   $ 810   $ 1,029   $ 8   $ 28,059 Commercial real estate 7,042   97   159   3   7,301   Credit Risk Profile by FICO Score (1), (2)   750+   650-749   <650   Other (3)   Total Automobile 5,369   4,044   1,298   256   $ 10,967 Home equity 6,280   2,891   638   294   10,103 Residential mortgage 4,663   2,285   615   87   7,650 RV and marine finance 1,064   644   73   64   1,845 Other consumer 347   456   133   20   956 (1) Excludes loans accounted for under the fair value option. (2) Reflects updated customer credit scores. (3) Reflects deferred fees and costs, loans in process, etc.
Summarized data for impaired loans and the related ALLL by portfolio segment	The following tables present the balance of the ALLL attributable to loans by portfolio segment individually and collectively evaluated for impairment and the related loan and lease balance for the years ended December 31, 2017 and 2016: (dollar amounts in millions)   Commercial   Consumer   Total ALLL at December 31, 2017:             Portion of ALLL balance:             Attributable to purchased credit-impaired loans   $ —   $ —   $ — Attributable to loans individually evaluated for impairment   $ 32   $ 9   $ 41 Attributable to loans collectively evaluated for impairment   450   200   650 Total ALLL balance   $ 482   $ 209   $ 691 Loan and Lease Ending Balances at December 31, 2017: (1)             Portion of loan and lease ending balance:             Attributable to purchased credit-impaired loans   $ 41   $ —   $ 41 Individually evaluated for impairment   607   616   1,223 Collectively evaluated for impairment   34,684   34,076   68,760 Total loans and leases evaluated for impairment   $ 35,332   $ 34,692   $ 70,024 (1) Excludes loans accounted for under the fair value option. (dollar amounts in millions)   Commercial   Consumer   Total ALLL at December 31, 2016:             Portion of ALLL balance:             Attributable to purchased credit-impaired loans   $ —   $ —   $ — Attributable to loans individually evaluated for impairment   11   11   22 Attributable to loans collectively evaluated for impairment   440   176   616 Total ALLL balance:   $ 451   $ 187   $ 638 Loan and Lease Ending Balances at December 31, 2016: (1)             Portion of loan and lease ending balances:             Attributable to purchased credit-impaired loans   $ 102   $ —   $ 102 Individually evaluated for impairment   416   458   874 Collectively evaluated for impairment   34,842   31,062   65,904 Total loans and leases evaluated for impairment   $ 35,360   $ 31,520   $ 66,880
Detailed impaired loan information by class	The following tables present by class the ending, unpaid principal balance, and the related ALLL, along with the average balance and interest income recognized only for impaired loans and leases and purchased credit-impaired loans for the years ended December 31, 2017 and 2016 (1) (2):               Year Ended   December 31, 2017   December 31, 2017 (dollar amounts in millions) Ending Balance   Unpaid Principal Balance (6)   Related Allowance   Average Balance   Interest Income Recognized With no related allowance recorded:                   Commercial and industrial $ 284   $ 311   $ —   $ 206   $ 12 Commercial real estate 56   81   —   64   8 Automobile —   —   —   —   — Home equity —   —   —   —   — Residential mortgage —   —   —   —   — RV and marine finance —   —   —   —   — Other consumer —   —   —   —   —                     With an allowance recorded:                   Commercial and industrial 257   280   29   292   16 Commercial real estate 51   51   3   52   2 Automobile 36   40   2   33   2 Home equity 334   385   14   329   15 Residential mortgage 308   338   4   325   12 RV and marine finance 2   3   —   1   — Other consumer 8   8   2   5   —                     Total                   Commercial and industrial (3) 541   591   29   498   28 Commercial real estate (4) 107   132   3   116   10 Automobile (2) 36   40   2   33   2 Home equity (5) 334   385   14   329   15 Residential mortgage (5) 308   338   4   325   12 RV and marine finance (2) 2   3   —   1   — Other consumer (2) 8   8   2   5   —                 Year Ended   December 31, 2016   December 31, 2016 (dollar amounts in millions) Ending Balance   Unpaid Principal Balance (6)   Related Allowance   Average Balance   Interest Income Recognized With no related allowance recorded:                   Commercial and industrial $ 300   $ 359   $ —   $ 293   $ 9 Commercial real estate 89   126   —   73   4 Automobile —   —   —   —   — Home equity —   —   —   —   — Residential mortgage —   —   —   —   — RV and marine finance —   —   —   —   — Other consumer —   —   —   —   —                     With an allowance recorded:                   Commercial and industrial 406   448   22   302   8 Commercial real estate 97   108   3   69   3 Automobile 31   31   2   32   2 Home equity 319   353   15   278   13 Residential mortgage 328   363   13   348   12 RV and marine finance —   —   —   —   — Other consumer 4   4   —   4   —                     Total                   Commercial and industrial (3) 706   807   22   595   17 Commercial real estate (4) 186   234   3   142   7 Automobile (2) 31   31   2   32   2 Home equity (5) 319   353   15   278   13 Residential mortgage (5) 328   363   13   348   12 RV and marine finance (2) —   —   —   —   — Other consumer (2) 4   4   —   4   — (1) These tables do not include loans fully charged-off. (2) All automobile, RV and marine finance and other consumer impaired loans included in these tables are considered impaired due to their status as a TDR. (3) At December 31, 2017 and December 31, 2016, commercial and industrial loans of $382 million and $317 million, respectively, were considered impaired due to their status as a TDR. (4) At December 31, 2017 and December 31, 2016, commercial real estate loans of $93 million and $82 million, respectively, were considered impaired due to their status as a TDR. (5) Includes home equity and residential mortgages considered to be collateral dependent due to their non-accrual status as well as home equity and mortgage loans considered impaired due to their status as a TDR. (6)
Detailed troubled debt restructuring information by class	The following table presents by class and by the reason for the modification the number of contracts, post-modification outstanding balance, and the financial effects of the modification for the years ended December 31, 2017 and 2016:   New Troubled Debt Restructurings During The Year Ended (1)   December 31, 2017   December 31, 2016 (dollar amounts in millions) Number of Contracts   Post-modification Outstanding Balance (2)   Financial effects of modification (3)   Number of Contracts   Post-modification Outstanding Balance (2)   Financial effects of modification (3) Commercial and industrial:                       Interest rate reduction 9   $ 1   $ —   4   $ —   $ — Amortization or maturity date change 1,034   600   (9 )   872   490   (9 ) Other 4   —   —   20   3   — Total Commercial and industrial 1,047   601   (9 )   896   493   (9 ) Commercial real estate:                       Interest rate reduction 3   —   —   2   —   — Amortization or maturity date change 106   122   (1 )   111   69   (2 ) Other 2   —   —   4   —   — Total commercial real estate: 111   122   (1 )   117   69   (2 ) Automobile:                       Interest rate reduction 31   —   —   17   —   — Amortization or maturity date change 1,727   15   1   1,593   15   1 Chapter 7 bankruptcy 983   8   —   1,059   8   — Other —   —   —   —   —   — Total Automobile 2,741   23   1   2,669   23   1 Home equity:                       Interest rate reduction 36   2   —   55   3   — Amortization or maturity date change 517   33   (4 )   578   32   (4 ) Chapter 7 bankruptcy 299   11   2   282   10   4 Other 70   4   —   —   —   — Total Home equity 922   50   (2 )   915   45   — Residential mortgage:                       Interest rate reduction 3   —   —   13   1   — Amortization or maturity date change 349   40   (2 )   363   39   (2 ) Chapter 7 bankruptcy 79   7   —   62   6   — Other 22   2   —   4   1   — Total Residential mortgage 453   49   (2 )   442   47   (2 ) RV and marine finance:                       Interest rate reduction 1   —   —   —   —   — Amortization or maturity date change 42   1   —   —   —   — Chapter 7 bankruptcy 88   1   —   —   —   — Other —   —   —   —   —   — Total RV and marine finance 131   2   —   —   —   — Other consumer:                       Interest rate reduction 19   —   —   —   —   — Amortization or maturity date change 1,312   6   —   6   1   — Chapter 7 bankruptcy 9   —   —   8   —   — Other —   —   —   —   —   — Total Other consumer 1,340   6   —   14   1   — Total new troubled debt restructurings 6,745   $ 853   $ (13 )   5,053   $ 678   $ (12 ) (1) TDRs may include multiple concessions and the disclosure classifications are based on the primary concession provided to the borrower. (2) Post-modification balances approximate pre-modification balances. The aggregate amount of charge-offs as a result of a restructuring are not significant. (3) Amounts represent the financial impact via provision (recovery) for loan and lease losses as a result of the modification.