Huntington Bancshares (HBAN) 10-Q 29 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	3 Months Ended
	Mar. 31, 2019shares
Document and Entity Information [Abstract]
Entity Registrant Name	HUNTINGTON BANCSHARES INC/MD
Entity Central Index Key	0000049196
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding (in shares)	1,046,440,116

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and due from banks		$ 804	$ 1,108
Interest-bearing deposits at Federal Reserve Bank		532	1,564
Interest-bearing deposits in banks		147	53
Trading account securities		166	105
Debt Securities, Available-for-sale		13,982	13,780
Debt Securities, Held-to-maturity		8,747	8,565
Equity Securities, FV-NI		486	565
Loans held for sale (includes $523 and $613 respectively, measured at fair value)	[1]	693	804
Loans and leases (includes $79 and $79 respectively, measured at fair value)	[1]	75,079	74,900
Allowance for loan and lease losses		(764)	(772)
Net loans and leases		74,315	74,128
Bank owned life insurance		2,516	2,507
Premises and equipment		784	790
Goodwill		1,990	1,989
Other Intangible Assets, Net		513	535
Other assets		2,528	2,288
Total assets		108,203	108,781
Liabilities
Deposits (includes $845 and $872 respectively, classified as held-for-sale)		82,155	84,774
Short-term borrowings		2,862	2,017
Long-term debt		9,400	8,625
Other liabilities		2,354	2,263
Total liabilities		96,771	97,679
Shareholders’ equity
Preferred stock		1,203	1,203
Common stock		11	11
Capital surplus		9,167	9,181
Less treasury shares, at cost		(45)	(45)
Accumulated other comprehensive loss		(455)	(609)
Retained earnings		1,551	1,361
Total shareholders’ equity		11,432	11,102
Total liabilities and shareholders’ equity		$ 108,203	$ 108,781
Common shares authorized (par value of $0.01) (in shares)		1,500,000,000	1,500,000,000
Common shares outstanding (in shares)		1,046,440,116	1,046,767,252
Treasury shares outstanding (in shares)		3,813,304	3,817,385
Preferred stock, authorized shares (in shares)		6,617,808	6,617,808
Preferred shares outstanding (in shares)		740,500	740,500
[1]	Amounts represent loans for which Huntington has elected the fair value option.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Assets
Loans held for sale, fair value	$ 523	$ 613
Loans and leases, fair value	$ 79	$ 79
Shareholders’ equity
Common stock, par value	$ 0.01	$ 0.01

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest and fee income:
Loans and leases	$ 901	$ 756
Available-for-sale securities
Taxable	76	70
Tax-exempt	22	23
Held-to-maturity securities—taxable	54	54
Other securities—taxable	6	6
Other	11	5
Total interest income	1,070	914
Interest expense:
Deposits	145	60
Short-term borrowings	14	19
Subordinated notes and other long-term debt	89	65
Total interest expense	248	144
Net interest income	822	770
Provision for credit losses	67	66
Net interest income after provision for credit losses	755	704
Service charges on deposit accounts	87	86
Cards and payment processing income	56	53
Trust and investment management services	44	44
Mortgage banking income	21	26
Capital markets fees	22	21
Insurance income	21	21
Bank owned life insurance income	16	15
Gain on sale of loans and leases	13	8
Other noninterest income	39	40
Total noninterest income	319	314
Personnel costs	394	376
Outside data processing and other services	81	73
Net occupancy	42	41
Equipment	40	40
Deposit and other insurance expense	8	18
Professional services	12	11
Marketing	7	8
Amortization of intangibles	13	14
Other noninterest expense	56	52
Total noninterest expense	653	633
Income before income taxes	421	385
Provision for income taxes	63	59
Net income	358	326
Dividends on preferred shares	19	12
Net income applicable to common shares	$ 339	$ 314
Average common shares—basic (in shares)	1,046,995	1,083,836
Average common shares—diluted (in shares)	1,065,638	1,124,778
Per common share:
Net income—basic (in usd per share)	$ 0.32	$ 0.29
Net income—diluted (in usd per share)	$ 0.32	$ 0.28

Condensed Consolidated Statem_2

Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 358	$ 326
Unrealized gains (losses) on available-for-sale securities:
Unrealized net gains (losses) on available-for-sale securities arising during the period, net of reclassification for net realized gains and losses	(146)	149
Total unrealized gains (losses) on available-for-sale securities	146	(149)
Change in fair value related to cash flow hedges, net of reclassification to earnings	7	0
Change in accumulated unrealized losses for pension and other post-retirement obligations	1	1
Other comprehensive income (loss), net of tax	154	(148)
Comprehensive income	$ 512	$ 178

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Capital Surplus	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings (Deficit)	Preferred Stock	Series B Preferred Stock	Series B Preferred StockRetained Earnings (Deficit)	Series C Preferred Stock	Series C Preferred StockRetained Earnings (Deficit)	Series E Preferred Stock	Series E Preferred StockRetained Earnings (Deficit)	Series D Preferred Stock	Series D Preferred StockRetained Earnings (Deficit)	Series D Preferred StockPreferred Stock
Balance, beginning of period (in shares) at Dec. 31, 2017		1,075,295		(3,268)
Balance, beginning of period at Dec. 31, 2017	$ 10,814	$ 11	$ 9,707	$ (35)	$ (528)	$ 588	$ 1,071
Comprehensive Income:
Net income	326					326
Other comprehensive income (loss), net of tax	(148)				(148)
Cash dividends declared:
Common stock, dividend	(121)					(121)
Preferred stock, dividend								$ 0	$ 0	$ (2)	$ (2)			$ (9)	$ (9)
Stock Issued During Period, Value, New Issues														495		$ 495
Stock Repurchased and Retired During Period, Shares		3,007
Stock Repurchased and Retired During Period, Value	48		48
Conversion of Stock, Amount Converted	0		363									$ (363)
Conversion of Stock, Shares		30,330
Recognition of the fair value of share-based compensation	15		15
Other share-based compensation activity (in shares)		2,371
Other share-based compensation activity	(15)		(12)			(3)
Other (in shares)				76
Other	1			$ 1
Balance, end of period (in shares) at Mar. 31, 2018		1,104,989		(3,192)
Balance, end of period at Mar. 31, 2018	11,308	$ 11	10,025	$ (34)	(677)	780	1,203
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	(1)
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Balance, beginning of period (in shares) at Dec. 31, 2018		1,050,584		3,817
Balance, beginning of period at Dec. 31, 2018	11,102	$ 11	9,181	$ (45)	(609)	1,361	1,203
Comprehensive Income:
Net income	358					358
Other comprehensive income (loss), net of tax	154				154
Cash dividends declared:
Common stock, dividend	(149)					(149)
Preferred stock, dividend								$ (1)	$ (1)	$ (2)	$ (2)	$ (7)	$ (7)	$ (9)	$ (9)
Stock Repurchased and Retired During Period, Shares		1,833
Stock Repurchased and Retired During Period, Value	25		25
Recognition of the fair value of share-based compensation	17		17
Other share-based compensation activity (in shares)		1,502
Other share-based compensation activity	(6)		(6)			0
Other (in shares)				(4)
Other	0		0	$ 0
Balance, end of period (in shares) at Mar. 31, 2019		1,050,253		(3,813)
Balance, end of period at Mar. 31, 2019	$ 11,432	$ 11	$ 9,167	$ (45)	$ (455)	$ 1,551	$ 1,203

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Cash dividends declared:
Common stock, Cash dividend per share (in usd per share)	$ 0.14	$ 0.11
Series A Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	0	0
Series B Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	13.72	11.05
Series C Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	14.69	14.69
Series D Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	15.63	15.63
Series E Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	$ 1,425	$ 0

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities
Net income	$ 358	$ 326
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	67	66
Depreciation and amortization	131	105
Share-based compensation expense	17	15
Deferred income tax expense	15	93
Net change in:
Trading account securities	(61)	1
Loans held for sale	72	(27)
Other assets	(284)	(237)
Other liabilities	176	(49)
Other, net	6	1
Net cash provided by (used in) operating activities	497	294
Investing activities
Change in interest bearing deposits in banks	(111)	22
Proceeds from:
Maturities and calls of available-for-sale securities	335	462
Maturities and calls of held-to-maturity securities	175	174
Maturities and calls of other securities	81	0
Sales of available-for-sale securities	0	203
Purchases of available-for-sale securities	(354)	(507)
Purchases of held-to-maturity securities	(356)	0
Purchases of other securities	(2)	(2)
Net proceeds from sales of portfolio loans	227	76
Finance Lease, Principal Payments	172	0
Net loan and lease activity, excluding sales and purchases	(528)	(1,137)
Purchases of premises and equipment	(24)	(16)
Purchases of loans and leases	(144)	(68)
Other, net	14	17
Net cash provided by (used in) investing activities	(515)	(776)
Financing activities
Increase in deposits	(2,619)	2,430
Increase (decrease) in short-term borrowings	776	(2,181)
Net proceeds from issuance of long-term debt	835	51
Maturity/redemption of long-term debt	(113)	(572)
Dividends paid on preferred stock	(18)	(19)
Dividends paid on common stock	(148)	(118)
Repurchases of common stock	(25)	(48)
Net proceeds from issuance of preferred stock	0	495
Payments related to tax-withholding for share based compensation awards	(8)	(10)
Proceeds from (Payments for) Other Financing Activities	2	3
Net cash provided by (used for) financing activities	(1,318)	31
Increase (decrease) in cash and cash equivalents	(1,336)	(451)
Cash and cash equivalents at beginning of period	2,672	1,520
Cash and cash equivalents at end of period	1,336	1,069
Supplemental disclosures:
Interest paid	249	159
Income taxes paid	1	11
Non-cash activities
Loans transferred to held-for-sale from portfolio	204	110
Loans transferred to portfolio from held-for-sale	3	31
Transfer of loans to OREO	6	6
Transfer of securities from held-to-maturity to available-for-sale	0	(2,707)
Transfer of securities from available-for-sale to held-to-maturity	$ 0	$ 2,833

BASIS OF PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying Unaudited Condensed Consolidated Financial Statements of Huntington reflect all adjustments consisting of normal recurring accruals which are, in the opinion of Management, necessary for a fair statement of the consolidated financial position, the results of operations, and cash flows for the periods presented. These Unaudited Condensed Consolidated Financial Statements have been prepared according to the rules and regulations of the SEC and, therefore, certain information and footnote disclosures normally included in annual financial statements prepared in accordance with GAAP have been omitted. The Notes to Consolidated Financial Statements appearing in Huntington’s 2018 Form 10-K, which include descriptions of significant accounting policies, as updated by the information contained in this report, should be read in conjunction with these interim financial statements. For statement of cash flow purposes, cash and cash equivalents are defined as the sum of Cash and due from banks and Interest-bearing deposits at Federal Reserve Bank. In conjunction with applicable accounting standards, all material subsequent events have been either recognized in the Unaudited Condensed Consolidated Financial Statements or disclosed in the Notes to Unaudited Condensed Consolidated Financial Statements. No subsequent events were disclosed for the current period. Certain amounts reported in prior periods have been reclassified to conform to the current period presentation. During the first quarter of 2019, Huntington reclassified loans syndication fees into capital markets fees from other noninterest income. There was no material effect on capital market fees or other noninterest income and no effect on net income as a result of this reclassification.

ACCOUNTING STANDARDS UPDATE

ACCOUNTING STANDARDS UPDATE	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
ACCOUNTING STANDARDS UPDATE	ACCOUNTING STANDARDS UPDATE Accounting standards adopted in current period Standard Summary of guidance Effects on financial statements ASU 2016-02 - Leases. Issued February 2016 - New lease accounting model for lessees and lessors. For lessees, virtually all leases will be required to be recognized on the balance sheet by recording a right-of-use asset and lease liability. Subsequent accounting for leases varies depending on whether the lease is classified as an operating lease or a finance lease. - Accounting applied by a lessor is largely unchanged from that applied under previous guidance. - Requires additional qualitative and quantitative disclosures with the objective of enabling users of the financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. - Effective for the fiscal period beginning after December 15, 2018, with early application permitted. - Management adopted the guidance on January 1, 2019, and elected certain practical expedients offered by the FASB, including foregoing the restatement of comparative periods upon adoption. Management also excluded short-term leases from the recognition of right-of-use asset and lease liabilities. Additionally, Huntington elected the transition relief allowed by FASB in foregoing reassessment of the following: whether any existing contracts were or contained leases, the classification of existing leases, and the determination of initial direct costs for existing leases. - Huntington recognized right-of-use assets of approximately $200 million offset by lease liabilities of approximately $250 million upon adoption, representing substantially all of its operating lease commitments, with the difference attributable to transition adjustments required by ASC Topic 842 relating to previously recognized amounts for deferred rent and lease exit costs (recorded pursuant to ASC Topic 420). Right-of-use assets and lease liabilities were based, primarily, on the present value of unpaid future minimum lease payments. Additionally, the amounts were impacted by assumptions around renewals and/or extensions, and the interest rate used to discount those future lease obligations. Impact to the income statement was not material in the current period. - Existing sale and leaseback guidance, including the detailed guidance applicable to sale-leasebacks of real estate, was replaced with a new model applicable to all assets, which will apply equally to both lessees and lessors. Under the new standard, if the transaction meets sale criteria, the seller-lessee will recognize the sale based on the new revenue recognition standard (when control transfers to the buyer-lessor), derecognizing the asset sold and replacing it with a right-of-use asset and lease liability for the leaseback. If the transaction is at fair value, the seller-lessee shall recognize a gain or loss on sale at that time. - Costs related to exiting an operating lease before the end of its contractual term have been historically accounted for pursuant to ASC Topic 420, with the recognition of a liability measured at the present value of remaining lease payments reduced by any expected sublease income upon the exit of that space. ASC Topic 842 changes the accounting for such costs, with entities evaluating the impairment of right-of-use assets using the guidance in ASC Topic 360. Such an impairment analysis would occur once the entity commits to a plan to abandon the space, which may accelerate the timing of these costs. - The new standard defines initial direct costs as those that would not have been incurred if the lease had not been obtained. Certain incremental costs previously eligible for capitalization, such as internal overhead, will now be expensed. Standard Summary of guidance Effects on financial statements ASU 2019-01 - Leases (ASC Topic 842): Codification Improvements Issued: March 2019 - Notes that lessors that are not manufacturers or dealers will apply the fair value exception in a manner similar to what they did prior to the implementation of ASC Topic 842. - Clarifies that lessors in the scope of ASC Topic 942 (Financial Services - Depository & Lending) must classify principal payments received from sales-type and direct financing leases in investing activities in the statement of cash flows. - Eliminates certain interim transition disclosure requirements related to the effect of an accounting change on certain interim period financial information. - The amendments relating to lessor accounting are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. - Huntington adopted the guidance concurrent with the adoption of ASU 2016-02 on January 1, 2019. The amendment did not have a material impact on Huntington's Unaudited Condensed Consolidated Financial Statements. Accounting standards yet to be adopted Standard Summary of guidance Effects on financial statements ASU 2016-13 - Financial Instruments - Credit Losses. Issued June 2016 - Eliminates the probable recognition threshold for credit losses on financial assets measured at amortized cost, replacing the current incurred loss model with an expected credit loss model. - Requires those financial assets subject to the new standard to be presented at the net amount expected to be collected (i.e., net of expected credit losses). - Measurement of expected credit losses should be based on relevant information including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. – The standard will require additional quantitative and qualitative disclosures to help users of the financial statements understand the credit risk inherent in Huntington’s portfolio and how management monitors the portfolio’s credit quality. - Effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018. - Adoption will be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. - Management intends to adopt the guidance on January 1, 2020 and has formed a working group comprised of teams from different disciplines including credit, finance, and risk management that has evaluated the requirements of the new standard and the impact it will have on our processes, systems and controls. This group is now working through implementing those identified process, system and control changes. - Huntington is continuing the process of developing credit models as well as accounting, reporting, and governance processes to comply with the new standard. For certain portfolios, development is complete and model implementation and validation is underway. Model development is anticipated to be substantially completed during the second quarter of 2019, and implementation and validation substantially completed during the third quarter of 2019. – The standard eliminates the current accounting model for purchased-credit-impaired loans, but requires an allowance to be recognized for purchased-credit-deteriorated (PCD) assets (those that have experienced more-than-insignificant deterioration in credit quality since origination). Huntington does not expect a material impact from PCD assets upon adoption. – Upon adoption, Huntington does not expect to record a material allowance with respect to HTM and AFS securities as the portfolios consist primarily of agency-backed securities that inherently have minimal nonpayment risk. ASU 2017-04 - Simplifying the Test for Goodwill Impairment. Issued January 2017 - Simplifies the goodwill impairment test by eliminating Step 2 of the goodwill impairment process, which requires an entity to determine the implied fair value of its goodwill by assigning fair value to all its assets and liabilities. - Entities will instead recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. - Entities will still have the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. - Effective for annual and interim goodwill tests performed in fiscal years beginning after December 15, 2019. Early adoption is permitted. - The amendment is not expected to have a material impact on Huntington's Unaudited Condensed Consolidated Financial Statements.

LOANS _ LEASES AND ALLOWANCE FO

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES	LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES Loans and leases which Huntington has the intent and ability to hold for the foreseeable future, or until maturity or payoff, are classified in the Unaudited Condensed Consolidated Balance Sheets as loans and leases. The total balance that is recognized against loans and leases pertaining to unamortized premiums, discounts, fees, and costs, was a net premium of $446 million and $428 million at March 31, 2019 and December 31, 2018 , respectively. Loan and Lease Portfolio Composition The following table provides a detailed listing of Huntington’s loan and lease portfolio at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) March 31, 2019 December 31, 2018 Loans and leases: Commercial and industrial $ 30,972 $ 30,605 Commercial real estate 6,795 6,842 Automobile 12,272 12,429 Home equity 9,551 9,722 Residential mortgage 10,885 10,728 RV and marine 3,344 3,254 Other consumer 1,260 1,320 Loans and leases $ 75,079 $ 74,900 Allowance for loan and lease losses (764 ) (772 ) Net loans and leases $ 74,315 $ 74,128 Equipment Leases Huntington leases equipment to customers, and substantially all such arrangements are classified as either sales-type or direct financing leases, which are included in C&I loans. These leases are reported at the aggregate of lease payments receivable and estimated residual values, net of unearned and deferred income, and any initial direct costs incurred to originate these leases. Renewal options for leases are at the option of the lessee, and are not included in the measurement of lease receivables as they are not considered reasonably certain of exercise. Purchase options are typically at fair value, and as such those options are not considered in the measurement of lease receivables or in lease classification. For leased equipment, the residual component of a direct financing lease represents the estimated fair value of the leased equipment at the end of the lease term. Huntington uses industry data, historical experience, and independent appraisals to establish these residual value estimates. Additional information regarding product life cycle, product upgrades, as well as insight into competing products are obtained through relationships with industry contacts and are factored into residual value estimates where applicable. Upon expiration of a lease, residual, assets are remarketed, resulting in an extension of the lease by the lessee, a lease to a new customer, or purchase of the residual asset by the lessee or another party. Huntington also purchases insurance guaranteeing the value of certain residual assets. Impairment of the residual values of direct financing leases is evaluated quarterly, with impairment arising if the expected fair value is less than the carrying amount. Effective January 1, 2019, as a result of the implementation of ASU 2016-02, Huntington will assess net investments in leases (including residual values) for impairment and recognize any impairment losses in accordance with the impairment guidance for financial instruments. As such, net investments in leases may be reduced by an allowance for credit losses, with changes recognized as provision expense. The following table presents net investments in lease financing receivables by category at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) March 31, December 31, Commercial and industrial: Lease payments receivable $ 1,727 $ 1,747 Estimated residual value of leased assets 717 726 Gross investment in commercial lease financing receivables 2,444 2,473 Deferred origination costs 19 20 Deferred fees (250 ) (250 ) Total net investment in C&I lease financing receivables $ 2,213 $ 2,243 The carrying value of residual values guaranteed were $96 million as of March 31, 2019 . The future lease rental payments due from customers on sales-type and direct financing leases at March 31, 2019 , totaled $1.7 billion and were due as follows: $0.6 billion in 2020 , $0.5 billion in 2021 , $0.3 billion in 2022 , $0.2 billion in 2023 , $0.1 billion in 2024 , and less than $0.1 billion thereafter. The interest income recognized for these types of leases is $26 million as of March 31, 2019 . Nonaccrual and Past Due Loans Loans are considered past due when the contractual amounts due with respect to principal and interest are not received within 30 days of the contractual due date. See Note 1 “Significant Accounting Policies” to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2018 for a description of the accounting policies related to the NALs. The following table presents NALs by loan class at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) March 31, December 31, Commercial and industrial $ 271 $ 188 Commercial real estate 9 15 Automobile 4 5 Home equity 64 62 Residential mortgage 68 69 RV and marine 1 1 Other consumer — — Total nonaccrual loans $ 417 $ 340 The following table presents an aging analysis of loans and leases, including past due loans and leases, by loan class at March 31, 2019 and December 31, 2018 : March 31, 2019 Past Due (1) Loans Accounted for Under FVO Total Loans 90 or (dollar amounts in millions) 30-59 60-89 90 or Total Current Commercial and industrial $ 49 $ 18 $ 48 $ 115 $ 30,857 $ — $ 30,972 $ 3 (2) Commercial real estate 1 3 4 8 6,787 — 6,795 — Automobile 64 13 7 84 12,188 — 12,272 6 Home equity 46 18 56 120 9,429 2 9,551 15 Residential mortgage 116 38 151 305 10,503 77 10,885 116 (3) RV and marine 9 2 2 13 3,331 — 3,344 2 Other consumer 12 6 5 23 1,237 — 1,260 5 Total loans and leases $ 297 $ 98 $ 273 $ 668 $ 74,332 $ 79 $ 75,079 $ 147 December 31, 2018 Past Due (1) Loans Accounted for Under FVO Total Loans 90 or (dollar amounts in millions) 30-59 60-89 90 or Total Current Commercial and industrial 72 17 51 140 30,465 — 30,605 7 (2) Commercial real estate 10 — 5 15 6,827 — 6,842 — Automobile 95 19 10 124 12,305 — 12,429 8 Home equity 51 21 56 128 9,593 1 9,722 17 Residential mortgage 108 47 168 323 10,327 78 10,728 131 (3) RV and marine 12 3 2 17 3,237 — 3,254 1 Other consumer 14 7 6 27 1,293 — 1,320 6 Total loans and leases $ 362 $ 114 $ 298 $ 774 $ 74,047 $ 79 $ 74,900 $ 170 (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. (3) Amounts include mortgage loans insured by U.S. government agencies. Allowance for Credit Losses Huntington maintains two reserves, both of which reflect Management’s judgment regarding the appropriate level necessary to absorb probable and estimable credit losses inherent in our loan and lease portfolio as of the balance sheet date: the ALLL and the AULC. Combined, these reserves comprise the total ACL. The determination of the ACL requires significant estimates, including the timing and amounts of expected future cash flows on impaired loans and leases, consideration of current economic conditions, and historical loss experience pertaining to pools of homogeneous loans and leases, all of which may be susceptible to change. See Note 1 “Significant Accounting Policies” to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2018 for a description of the accounting policies related to the ACL. The ALLL is increased through a provision for credit losses that is charged to earnings, based on Management’s quarterly evaluation and is reduced by charge-offs, net of recoveries. The following table presents ALLL and AULC activity by portfolio segment for the three-month periods ended March 31, 2019 and 2018 . (dollar amounts in millions) Commercial Consumer Total Three-month period ended March 31, 2019: ALLL balance, beginning of period $ 542 $ 230 $ 772 Loan charge-offs (45 ) (52 ) (97 ) Recoveries of loans previously charged-off 12 14 26 Provision for loan and lease losses 36 27 63 ALLL balance, end of period $ 545 $ 219 $ 764 AULC balance, beginning of period $ 94 $ 2 $ 96 Provision (reduction in allowance) for unfunded loan commitments and letters of credit 4 — 4 AULC balance, end of period $ 98 $ 2 $ 100 ACL balance, end of period $ 643 $ 221 $ 864 (dollar amounts in millions) Commercial Consumer Total Three-month period ended March 31, 2018: ALLL balance, beginning of period $ 482 $ 209 $ 691 Loan charge-offs (23 ) (50 ) (73 ) Recoveries of loans previously charged-off 20 15 35 Provision for loan and lease losses 36 32 68 ALLL balance, end of period $ 515 $ 206 $ 721 AULC balance, beginning of period $ 84 $ 3 $ 87 Provision (reduction in allowance) for unfunded loan commitments and letters of credit (2 ) — (2 ) AULC balance, end of period $ 82 $ 3 $ 85 ACL balance, end of period $ 597 $ 209 $ 806 Credit Quality Indicators See Note 3 “Loans / Leases and Allowance for Credit Losses” to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2018 for a description of the credit quality indicators Huntington utilizes for monitoring credit quality and for determining an appropriate ACL level. To facilitate the monitoring of credit quality for commercial loans, and for purposes of determining an appropriate ACL level for these loans, Huntington utilizes the following internally defined categories of credit grades: • Pass - Higher quality loans that do not fit any of the other categories described below. • OLEM - The credit risk may be relatively minor yet represents a risk given certain specific circumstances. If the potential weaknesses are not monitored or mitigated, the loan may weaken or the collateral may be inadequate to protect Huntington’s position in the future. For these reasons, Huntington considers the loans to be potential problem loans. • Substandard - Inadequately protected loans by the borrower’s ability to repay, equity, and/or the collateral pledged to secure the loan. These loans have identified weaknesses that could hinder normal repayment or collection of the debt. It is likely Huntington will sustain some loss if any identified weaknesses are not mitigated. • Doubtful - Loans that have all of the weaknesses inherent in those loans classified as Substandard, with the added elements of the full collection of the loan is improbable and that the possibility of loss is high. Loans are generally assigned a category of " Pass " rating upon initial approval and subsequently updated as appropriate based on the borrowers financial performance. Commercial loans categorized as OLEM, Substandard, or Doubtful are considered Criticized loans. Commercial loans categorized as Substandard or Doubtful are both considered Classified loans. The following table presents each loan and lease class by credit quality indicator at March 31, 2019 and December 31, 2018 . March 31, 2019 (dollar amounts in millions) Credit Risk Profile by UCS Classification Commercial Pass OLEM Substandard Doubtful Total Commercial and industrial $ 29,038 $ 563 $ 1,365 $ 6 $ 30,972 Commercial real estate 6,513 207 73 2 6,795 Credit Risk Profile by FICO Score (1), (2) Consumer 750+ 650-749 <650 Other (3) Total Automobile $ 6,111 $ 4,491 $ 1,388 $ 282 $ 12,272 Home equity 5,977 2,915 604 53 9,549 Residential mortgage 7,293 2,782 606 127 10,808 RV and marine 2,138 1,005 112 89 3,344 Other consumer 472 607 134 47 1,260 December 31, 2018 (dollar amounts in millions) Credit Risk Profile by UCS Classification Commercial Pass OLEM Substandard Doubtful Total Commercial and industrial $ 28,807 $ 518 $ 1,269 $ 11 $ 30,605 Commercial real estate 6,586 181 74 1 6,842 Credit Risk Profile by FICO Score (1), (2) Consumer 750+ 650-749 <650 Other (3) Total Automobile $ 6,254 $ 4,520 $ 1,373 $ 282 $ 12,429 Home equity 6,098 2,975 591 56 9,720 Residential mortgage 7,159 2,801 612 78 10,650 RV and marine 2,074 990 105 85 3,254 Other consumer 501 633 129 57 1,320 (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. Impaired Loans See Note 1 “Significant Accounting Policies” to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2018 for a description of accounting policies related to impaired loans. 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 at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) Commercial Consumer Total ALLL at March 31, 2019 Portion of ALLL balance: Attributable to loans individually evaluated for impairment $ 50 $ 9 $ 59 Attributable to loans collectively evaluated for impairment 495 210 705 Total ALLL balance $ 545 $ 219 $ 764 Loan and Lease Ending Balances at March 31, 2019 (1) Portion of loan and lease ending balance: Individually evaluated for impairment $ 610 $ 589 $ 1,199 Collectively evaluated for impairment 37,157 36,644 73,801 Total loans and leases evaluated for impairment $ 37,767 $ 37,233 $ 75,000 (1) Excludes loans accounted for under the fair value option. (dollar amounts in millions) Commercial Consumer Total ALLL at December 31, 2018 Portion of ALLL balance: Attributable to loans individually evaluated for impairment $ 33 $ 10 $ 43 Attributable to loans collectively evaluated for impairment 509 220 729 Total ALLL balance: $ 542 $ 230 $ 772 Loan and Lease Ending Balances at December 31, 2018 (1) Portion of loan and lease ending balances: Individually evaluated for impairment 516 591 1,107 Collectively evaluated for impairment 36,931 36,783 73,714 Total loans and leases evaluated for impairment $ 37,447 $ 37,374 $ 74,821 (1) Excludes loans accounted for under the fair value option. 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: (1) March 31, 2019 Three Months Ended (dollar amounts in millions) Ending Balance Unpaid Principal Balance (6) Related Allowance (7) Average Balance Interest Income Recognized With no related allowance recorded: Commercial and industrial $ 207 $ 235 $ — $ 215 $ 6 Commercial real estate 40 44 — 38 2 With an allowance recorded: Commercial and industrial 328 362 48 274 2 Commercial real estate 35 40 2 35 — Automobile 40 43 2 39 1 Home equity 311 351 11 313 3 Residential mortgage 287 322 4 287 3 RV and marine 3 3 — 2 — Other consumer 9 9 2 9 — Total Commercial and industrial (3) 535 597 48 489 8 Commercial real estate (4) 75 84 2 73 2 Automobile (2) 40 43 2 39 1 Home equity (5) 311 351 11 313 3 Residential mortgage (5) 287 322 4 287 3 RV and marine (2) 3 3 — 2 — Other consumer (2) 9 9 2 9 — December 31, 2018 Three Months Ended (dollar amounts in millions) Ending Balance Unpaid Principal Balance (6) Related Allowance (7) Average Balance Interest Income Recognized With no related allowance recorded: Commercial and industrial $ 224 $ 261 $ — $ 264 $ 5 Commercial real estate 36 45 — 63 2 With an allowance recorded: Commercial and industrial 221 240 31 286 3 Commercial real estate 35 39 2 47 — Automobile 38 42 2 36 1 Home equity 314 356 10 334 3 Residential mortgage 287 323 4 308 3 RV and marine 2 3 — 2 — Other consumer 9 9 3 7 — Total Commercial and industrial (3) 445 501 31 550 8 Commercial real estate (4) 71 84 2 110 2 Automobile (2) 38 42 2 36 1 Home equity (5) 314 356 10 334 3 Residential mortgage (5) 287 323 4 308 3 RV and marine (2) 2 3 — 2 — Other consumer (2) 9 9 3 7 — (1) These tables do not include loans fully charged-off. (2) All automobile, RV and marine, and other consumer impaired loans included in these tables are considered impaired due to their status as a TDR. (3) At March 31, 2019 and December 31, 2018 , C&I loans of $356 million and $366 million , respectively, were considered impaired due to their status as a TDR. (4) At March 31, 2019 and December 31, 2018 , CRE loans of $66 million and $60 million , respectively, were considered impaired due to their status as a TDR. (5) Includes home equity and residential mortgages considered impaired due to collateral dependent designation associated with their non-accrual status as well as home equity and mortgage loans considered impaired due to their status as a TDR. (6) The differences between the ending balance and unpaid principal balance amounts primarily represent partial charge-offs. (7) Impaired loans in the consumer portfolio are evaluated in pools and not at the loan level. Thus, these loans do not have an individually assigned allowance and as such are all classified as with an allowance in the tables above. TDR Loans TDRs are modified loans where a concession was provided to a borrower experiencing financial difficulties. Loan modifications are considered TDRs when the concessions provided are not available to the borrower through either normal channels or other sources. However, not all loan modifications are TDRs. See Note 3 “Loans / Leases and Allowance for Credit Losses” to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2018 for an additional discussion of TDRs. The following table presents, by class and modification type, the number of contracts, post-modification outstanding balance, and the financial effects of the modification for the three-month periods ended March 31, 2019 and 2018 . New Troubled Debt Restructurings (1) Three Months Ended March 31, 2019 Number of Post-modification Outstanding Recorded Investment (2) (dollar amounts in millions) Interest rate reduction Amortization or maturity date change Chapter 7 bankruptcy Other Total Commercial and industrial 115 $ — $ 35 $ — $ — $ 35 Commercial real estate 8 — 9 — — 9 Automobile 744 — 5 2 — 7 Home equity 104 — 3 2 — 5 Residential mortgage 76 — 8 — — 8 RV and marine 36 — — 1 — 1 Other consumer 244 1 — — — 1 Total new TDRs 1,327 $ 1 $ 60 $ 5 $ — $ 66 Three Months Ended March 31, 2018 Number of Post-modification Outstanding Recorded Investment (2) (dollar amounts in millions) Interest rate reduction Amortization or maturity date change Chapter 7 bankruptcy Other Total Commercial and industrial 241 $ — $ 96 $ — $ — $ 96 Commercial real estate 48 — 32 — — 32 Automobile 627 — 4 2 — 6 Home equity 144 — 5 3 — 8 Residential mortgage 83 — 9 — — 9 RV and marine 19 — — — — — Other consumer 441 2 — — — 2 Total new TDRs 1,603 $ 2 $ 146 $ 5 $ — $ 153 (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 financial effects of modification represent the financial impact via provision (recovery) for loan and lease losses as a result of the modification and were $(3) million and $(3) million at March 31, 2019 and March 31, 2018 , respectively. Pledged Loans and Leases The Bank has access to the Federal Reserve’s discount window and advances from the FHLB of Cincinnati. As of March 31, 2019 and December 31, 2018 , these borrowings and advances are secured by $37.6 billion and $46.5 billion , respectively, of loans and securities.

INVESTMENT SECURITIES AND OTHER

INVESTMENT SECURITIES AND OTHER SECURITIES	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investment Securities Disclosure [Text Block]	INVESTMENT SECURITIES AND OTHER SECURITIES Debt securities purchased in which Huntington has the positive intent and ability to hold to their maturity are classified as held-to-maturity securities. All other debt and equity securities are classified as either available-for-sale or other securities. The following tables provide amortized cost, fair value, and gross unrealized gains and losses by investment category at March 31, 2019 and December 31, 2018 : Unrealized (dollar amounts in millions) Amortized Cost Gross Gains Gross Losses Fair Value March 31, 2019 Available-for-sale securities: U.S. Treasury $ 5 $ — $ — $ 5 Federal agencies: Residential CMO 7,093 25 (108 ) 7,010 Residential MBS 1,359 19 (5 ) 1,373 Commercial MBS 1,606 — (53 ) 1,553 Other agencies 119 — (1 ) 118 Total U.S. Treasury, federal agency and other agency securities 10,182 44 (167 ) 10,059 Municipal securities 3,539 17 (38 ) 3,518 Asset-backed securities 350 2 (3 ) 349 Corporate debt 51 1 — 52 Other securities/Sovereign debt 4 — — 4 Total available-for-sale securities $ 14,126 $ 64 $ (208 ) $ 13,982 Held-to-maturity securities: Federal agencies: Residential CMO $ 2,125 $ 4 $ (23 ) $ 2,106 Residential MBS 2,093 11 (15 ) 2,089 Commercial MBS 4,187 1 (130 ) 4,058 Other agencies 338 — (4 ) 334 Total federal agency and other agency securities 8,743 16 (172 ) 8,587 Municipal securities 4 — — 4 Total held-to-maturity securities $ 8,747 $ 16 $ (172 ) $ 8,591 Other securities, at cost: Non-marketable equity securities: Federal Home Loan Bank stock $ 167 $ — $ — $ 167 Federal Reserve Bank stock 296 — — 296 Other securities, at fair value Mutual funds 21 — — 21 Marketable equity securities 1 1 — 2 Total other securities $ 485 $ 1 $ — $ 486 Unrealized (dollar amounts in millions) Amortized Gross Gross Fair Value December 31, 2018 Available-for-sale securities: U.S. Treasury $ 5 $ — $ — $ 5 Federal agencies: Residential CMO 7,185 15 (201 ) 6,999 Residential MBS 1,261 9 (15 ) 1,255 Commercial MBS 1,641 — (58 ) 1,583 Other agencies 128 — (2 ) 126 Total U.S. Treasury, federal agency and other agency securities 10,220 24 (276 ) 9,968 Municipal securities 3,512 6 (78 ) 3,440 Asset-backed securities 318 1 (4 ) 315 Corporate debt 54 — (1 ) 53 Other securities/Sovereign debt 4 — — 4 Total available-for-sale securities $ 14,108 $ 31 $ (359 ) $ 13,780 Held-to-maturity securities: Federal agencies: Residential CMO $ 2,124 $ — $ (47 ) $ 2,077 Residential MBS 1,851 2 (42 ) 1,811 Commercial MBS 4,235 — (186 ) 4,049 Other agencies 350 — (6 ) 344 Total federal agency and other agency securities 8,560 2 (281 ) 8,281 Municipal securities 5 — — 5 Total held-to-maturity securities $ 8,565 $ 2 $ (281 ) $ 8,286 Other securities, at cost: Non-marketable equity securities: Federal Home Loan Bank stock $ 248 $ — $ — $ 248 Federal Reserve Bank stock 295 — — 295 Other securities, at fair value Mutual funds 20 — — 20 Marketable equity securities 1 1 — 2 Total other securities $ 564 $ 1 $ — $ 565 The following table provides the amortized cost and fair value of securities by contractual maturity at March 31, 2019 and December 31, 2018 . Expected maturities may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without incurring penalties. March 31, 2019 December 31, 2018 (dollar amounts in millions) Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities: Under 1 year $ 258 $ 254 $ 186 $ 185 After 1 year through 5 years 1,028 1,018 1,057 1,039 After 5 years through 10 years 1,879 1,869 1,838 1,802 After 10 years 10,961 10,841 11,027 10,754 Total available-for-sale securities $ 14,126 $ 13,982 $ 14,108 $ 13,780 Held-to-maturity securities: Under 1 year $ — $ — $ — $ — After 1 year through 5 years 20 20 11 11 After 5 years through 10 years 344 341 362 356 After 10 years 8,383 8,230 8,192 7,919 Total held-to-maturity securities $ 8,747 $ 8,591 $ 8,565 $ 8,286 The following tables provide detail on investment securities with unrealized losses aggregated by investment category and the length of time the individual securities have been in a continuous loss position at March 31, 2019 and December 31, 2018 : Less than 12 Months Over 12 Months Total (dollar amounts in millions) Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized March 31, 2019 Available-for-sale securities: Federal agencies: Residential CMO $ 27 $ — $ 5,287 $ (108 ) $ 5,314 $ (108 ) Residential MBS — — 537 (5 ) 537 (5 ) Commercial MBS — — 1,553 (53 ) 1,553 (53 ) Other agencies — — 116 (1 ) 116 (1 ) Total federal agency and other agency securities 27 — 7,493 (167 ) 7,520 (167 ) Municipal securities 593 (7 ) 1,867 (31 ) 2,460 (38 ) Asset-backed securities 56 (1 ) 153 (2 ) 209 (3 ) Total temporarily impaired securities $ 676 $ (8 ) $ 9,513 $ (200 ) $ 10,189 $ (208 ) Held-to-maturity securities: Federal agencies: Residential CMO $ — $ — $ 1,283 $ (23 ) $ 1,283 $ (23 ) Residential MBS — — 1,464 (15 ) 1,464 (15 ) Commercial MBS — — 4,049 (130 ) 4,049 (130 ) Other agencies 6 — 279 (4 ) 285 (4 ) Total federal agency and other agency securities 6 — 7,075 (172 ) 7,081 (172 ) Municipal securities — — 4 — 4 — Total temporarily impaired securities $ 6 $ — $ 7,079 $ (172 ) $ 7,085 $ (172 ) Less than 12 Months Over 12 Months Total (dollar amounts in millions) Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized December 31, 2018 Available-for-sale securities: Federal agencies: Residential CMO $ 425 $ (3 ) $ 5,943 $ (198 ) $ 6,368 $ (201 ) Residential MBS 259 (6 ) 319 (9 ) 578 (15 ) Commercial MBS 10 — 1,573 (58 ) 1,583 (58 ) Other agencies — — 124 (2 ) 124 (2 ) Total federal agency and other agency securities 694 (9 ) 7,959 (267 ) 8,653 (276 ) Municipal securities 1,425 (24 ) 1,602 (54 ) 3,027 (78 ) Asset-backed securities 95 (2 ) 117 (2 ) 212 (4 ) Corporate debt 40 — 1 (1 ) 41 (1 ) Total temporarily impaired securities $ 2,254 $ (35 ) $ 9,679 $ (324 ) $ 11,933 $ (359 ) Held-to-maturity securities: Federal agencies: Residential CMO $ 12 $ — $ 2,004 $ (47 ) $ 2,016 $ (47 ) Residential MBS 16 — 1,457 (42 ) 1,473 (42 ) Commercial MBS — — 4,041 (186 ) 4,041 (186 ) Other agencies 113 (2 ) 205 (4 ) 318 (6 ) Total federal agency and other agency securities 141 (2 ) 7,707 (279 ) 7,848 (281 ) Municipal securities — — 4 — 4 — Total temporarily impaired securities $ 141 $ (2 ) $ 7,711 $ (279 ) $ 7,852 $ (281 ) At March 31, 2019 and December 31, 2018 , the carrying value of investment securities pledged to secure public and trust deposits, trading account liabilities, U.S. Treasury demand notes, and security repurchase agreements totaled $3.6 billion and $4.5 billion , respectively. There were no securities of a single issuer, which are not governmental or government-sponsored, that exceeded 10% of shareholders’ equity at either March 31, 2019 or December 31, 2018 . Security Impairment Huntington evaluates the securities portfolio for impairment on a quarterly basis. As of March 31, 2019 , the Company has evaluated available-for-sale and held-to-maturity securities with gross unrealized losses for impairment and concluded no OTTI is required. Other securities that are carried at cost are reviewed for impairment on a quarterly basis, with valuation adjustments recognized in other noninterest income. As of March 31, 2019 , the Company concluded no impairment is required.

MORTGAGE LOAN SALES AND SERVICI

MORTGAGE LOAN SALES AND SERVICING RIGHTS	3 Months Ended
	Mar. 31, 2019
Transfers and Servicing [Abstract]
LOAN SALES AND SECURITIZATIONS	Residential Mortgage Portfolio The following table summarizes activity relating to residential mortgage loans sold with servicing retained for the three-month periods ended March 31, 2019 and 2018 : Three Months Ended (dollar amounts in millions) 2019 2018 Residential mortgage loans sold with servicing retained $ 833 $ 843 Pretax gains resulting from above loan sales (1) 12 21 (1) Recorded in mortgage banking income. The following table summarizes the changes in MSRs recorded using the amortization method for the three-month periods ended March 31, 2019 and 2018 : Three Months Ended (dollar amounts in millions) 2019 2018 Carrying value, beginning of period $ 211 $ 191 New servicing assets created 9 10 Impairment recovery (charge) (9 ) 7 Amortization (9 ) (8 ) Carrying value, end of period $ 202 $ 200 Fair value, end of period $ 202 $ 205 Weighted-average life (years) 6.1 7.0 MSRs do not trade in an active, open market with readily observable prices. Therefore, the fair value of MSRs is estimated using a discounted future cash flow model. Changes in the assumptions used may have a significant impact on the valuation of MSRs. MSR values are highly sensitive to movement in interest rates as expected future net servicing income depends on the projected outstanding principal balances of the underlying loans, which can be greatly impacted by the level of prepayments. For MSRs under the amortization method, a summary of key assumptions and the sensitivity of the MSR value to changes in these assumptions at March 31, 2019 , and December 31, 2018 follows: March 31, 2019 December 31, 2018 Decline in fair value due to Decline in fair value due to (dollar amounts in millions) Actual 10% 20% Actual 10% 20% Constant prepayment rate (annualized) 11.40 % $ (6 ) $ (12 ) 9.40 % $ (6 ) $ (12 ) Spread over forward interest rate swap rates 886 bps (7 ) (13 ) 934 bps (7 ) (13 ) Additionally, at March 31, 2019 and 2018 , Huntington held MSRs recorded using the fair value method of $10 million and $12 million , respectively. The change in fair value representing time decay, payoffs and changes in valuation inputs and assumptions for the three-month periods ended March 31, 2019 and 2018 was less than $1 million and $1 million , respectively. Total servicing, late fees and other ancillary fees included in mortgage banking income was $15 million and $15 million for the three-month periods ended March 31, 2019 and 2018 , respectively. The unpaid principal balance of residential mortgage loans serviced for third parties was $21.3 billion and $21.0 billion at March 31, 2019 and December 31, 2018 , respectively.

OPERATING LEASES

OPERATING LEASES	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
OPERATING LEASES	At March 31, 2019 , Huntington and its subsidiaries were obligated under noncancelable leases for branch and office space. These leases are all classified as operating due to the amount of time such spaces are occupied relative to the underlying assets useful lives. Many of these leases contain renewal options, most of which are not included in measurement of the right-of-use asset as they are not considered reasonably certain of exercise (i.e., Huntington does not currently have a significant economic incentive to exercise these options). Some leases contain escalation clauses calling for rentals to be adjusted for increased real estate taxes and other operating expenses or proportionately adjusted for increases in the consumer or other price indices. Occasionally, Huntington will sublease the land and buildings for which it has obtained the right to use; substantially all of those sublease arrangements are classified as operating, with sublease income recognized on a straight-line basis over the contractual term of the arrangement. Huntington has elected not to include non-lease components in the measurement of right-of-use assets, and as such allocates the costs attributable to such components, where those costs are not separately identifiable, via per-square-foot costing analysis developed by the entity for owned and leased spaces. Huntington uses a portfolio approach to develop discount rates as its lease portfolio is comprised of substantially all branch space and office space used in the entity’s operations. That rate, an input used in the measurement of the entity’s right-of-use assets, leverages an incremental borrowing rate of appropriate tenor and collateralization. Net lease assets and liabilities at March 31, 2019 are as follows: (dollar amounts in millions) Classification March 31, 2019 Assets Operating lease assets Other assets $ 203 Liabilities Lease liabilities Other liabilities $ 228 Net lease cost for the three months ended March 31, 2019 is as follows: (dollar amounts in millions) Classification Three Months Ended March 31, 2019 Operating lease cost Net occupancy $ 11 Sublease income Net occupancy (1 ) Net lease cost $ 10 Maturity of lease liabilities at March 31, 2019 are as follows: (dollar amounts in millions) Total 2019 $ 36 2020 50 2021 36 2022 31 2023 26 Thereafter 93 Total lease payments $ 272 Less: Interest (44 ) Total $ 228 Lease term and discount rate as of March 31, 2019 are as follows: March 31, 2019 Weighted-average remaining lease term (years) Operating leases 7.3 Weighted-average discount rate Operating leases 4.73 % Cash flow supplemental information at March 31, 2019 are as follows: (dollar amounts in millions) Three Months Ended March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 14 Right-of-use assets obtained in exchange for lease obligations Operating leases 1

LONG-TERM DEBT

LONG-TERM DEBT	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT In January 2019, the Bank issued $300 million of senior notes at 100% of face value. The senior notes mature on February 5, 2021 and do not have a fixed coupon rate. The senior notes may be redeemed one month prior to the maturity date at 100% of principal plus accrued and unpaid interest. In February 2019, the Bank issued $500 million of senior notes at 99.909% of face value. The senior notes mature on April 1, 2022 and have a fixed coupon rate of 3.125% . The senior notes may be redeemed one month prior to the maturity date at 100% of principal plus accrued and unpaid interest.

OTHER COMPREHENSIVE INCOME

OTHER COMPREHENSIVE INCOME	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
OTHER COMPREHENSIVE INCOME	OTHER COMPREHENSIVE INCOME The components of Huntington's OCI for the three-month periods ended March 31, 2019 and 2018 , were as follows: Three Months Ended Tax (expense) (dollar amounts in millions) Pretax Benefit After-tax Unrealized gains (losses) on available-for-sale securities arising during the period $ 184 $ (41 ) $ 143 Less: Reclassification adjustment for realized net losses (gains) included in net income 4 (1 ) 3 Net change in unrealized holding gains (losses) on available-for-sale securities 188 (42 ) 146 Net change in fair value on cash flow hedges 8 (1 ) 7 Net change in pension and other post-retirement obligations 1 — 1 Total other comprehensive income (loss) $ 197 $ (43 ) $ 154 Three Months Ended Tax (expense) (dollar amounts in millions) Pretax Benefit After-tax Unrealized gains (losses) on available-for-sale securities arising during the period $ (206 ) $ 45 $ (161 ) Less: Reclassification adjustment for realized net losses (gains) included in net income 15 (3 ) 12 Net change in unrealized gains (losses) on available-for-sale securities (191 ) 42 (149 ) Net change in pension and other post-retirement obligations 1 — 1 Total other comprehensive income (loss) $ (190 ) $ 42 $ (148 ) Activity in accumulated OCI for the three -month periods ended March 31, 2019 and 2018 , were as follows: (dollar amounts in millions) Unrealized gains (losses) on debt securities (1) Change in fair value related to cash flow hedges Unrealized gains (losses) for pension and other post- retirement obligations Total Three Months Ended March 31, 2019 Balance, beginning of period $ (363 ) $ — $ (246 ) $ (609 ) Other comprehensive income before reclassifications 143 7 — 150 Amounts reclassified from accumulated OCI to earnings 3 — 1 4 Period change 146 7 1 154 Balance, end of period $ (217 ) $ 7 $ (245 ) $ (455 ) Three Months Ended March 31, 2018 Balance, beginning of period $ (278 ) $ — $ (250 ) $ (528 ) Cumulative-effect adjustments (ASU 2016-01) (1 ) (1 ) Other comprehensive income before reclassifications (161 ) — — (161 ) Amounts reclassified from accumulated OCI to earnings 12 — 1 13 Period change (149 ) — 1 (148 ) Balance, end of period $ (428 ) $ — $ (249 ) $ (677 ) (1) AOCI amounts at March 31, 2019 , December 31, 2018 and March 31, 2018 include $134 million , $137 million and $147 million , respectively, of net unrealized losses on securities transferred from the available-for-sale securities portfolio to the held-to-maturity securities portfolio. The net unrealized losses will be recognized in earnings over the remaining life of the security using the effective interest method. The following table presents the reclassification adjustments out of accumulated OCI included in net income and the impacted line items as listed on the Unaudited Condensed Consolidated Statements of Income for the three-month periods ended March 31, 2019 and 2018 : Reclassifications out of accumulated OCI Accumulated OCI components Amounts reclassified from accumulated OCI Location of net gain (loss) reclassified from accumulated OCI into earnings Three Months Ended (dollar amounts in millions) March 31, 2019 March 31, 2018 Gains (losses) on debt securities: Amortization of unrealized gains (losses) $ (4 ) $ (3 ) Interest income - held-to-maturity securities - taxable Realized gain (loss) on sale of securities — (12 ) Noninterest income - net gains (losses) on sale of securities Total before tax (4 ) (15 ) Tax (expense) benefit 1 3 Net of tax $ (3 ) $ (12 ) Amortization of defined benefit pension and post-retirement items: Actuarial gains (losses) $ (2 ) $ 2 Noninterest income Net periodic benefit costs 1 (1 ) Noninterest income Total before tax (1 ) 1 Tax (expense) benefit — — Net of tax $ (1 ) $ 1

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic earnings per share is the amount of earnings (adjusted for dividends declared on preferred stock) available to each share of common stock outstanding during the reporting period. Diluted earnings per share is the amount of earnings available to each share of common stock outstanding during the reporting period adjusted to include the effect of potentially dilutive common shares. Potentially dilutive common shares include incremental shares issued for stock options, restricted stock units and awards, and distributions from deferred compensation plans. Potentially dilutive common shares are excluded from the computation of diluted earnings per share in periods in which the effect would be antidilutive. The 2018 total diluted average common shares issued and outstanding was impacted by using the if-converted method. The calculation of basic and diluted earnings per share for the three -month periods ended March 31, 2019 and 2018 was as follows: Three Months Ended (dollar amounts in millions, except per data, share count in thousands) 2019 2018 Basic earnings per common share: Net income $ 358 $ 326 Preferred stock dividends (19 ) (12 ) Net income available to common shareholders $ 339 $ 314 Average common shares issued and outstanding 1,046,995 1,083,836 Basic earnings per common share $ 0.32 $ 0.29 Diluted earnings per common share: Dilutive potential common shares: Stock options and restricted stock units and awards 14,807 19,858 Shares held in deferred compensation plans 3,836 3,228 Dilutive impact of Preferred Stock — 17,856 Dilutive potential common shares 18,643 40,942 Total diluted average common shares issued and outstanding 1,065,638 1,124,778 Diluted earnings per common share $ 0.32 $ 0.28 There were approximately 4.0 million and 0.1 million of options to purchase shares of common stock not included in the computation of diluted earnings per share because the effect would be antidilutive for the three-month periods ended March 31, 2019 and 2018 , respectively.

NONINTEREST INCOME

NONINTEREST INCOME	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
NONINTEREST INCOME	NONINTEREST INCOME Huntington earns a variety of revenue including interest and fees from customers as well as revenues from non-customers. Certain sources of revenue are recognized within interest or fee income and are outside of the scope of ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”). Other sources of revenue fall within the scope of ASC 606 and are generally recognized within noninterest income. These revenues are included within various sections of the Unaudited Condensed Consolidated Financial Statements. The following table shows Huntington’s total noninterest income segregated between contracts with customers within the scope of ASC 606 and those within the scope of other GAAP Topics. (dollar amounts in millions) Three Months Ended March 31, 2019 2018 Noninterest income Noninterest income from contracts with customers $ 222 $ 214 Noninterest income within the scope of other GAAP topics 97 100 Total noninterest income $ 319 $ 314 The following table illustrates the disaggregation by operating segment and major revenue stream and reconciles disaggregated revenue to segment revenue presented in Note 15 " Segment Reporting ". Three Months Ended March 31, 2019 (dollar amounts in millions) Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated Major Revenue Streams Service charges on deposit accounts $ 69 $ 16 $ 1 $ 1 $ — $ 87 Card and payment processing income 50 3 — — — 53 Trust and investment management services 8 — — 35 1 44 Insurance income 8 2 — 11 — 21 Other income 8 5 1 3 — 17 Net revenue from contracts with customers $ 143 $ 26 $ 2 $ 50 $ 1 $ 222 Noninterest income within the scope of other GAAP topics 31 50 — 1 15 97 Total noninterest income $ 174 $ 76 $ 2 $ 51 $ 16 $ 319 Three Months Ended March 31, 2018 (dollar amounts in millions) Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated Major Revenue Streams Service charges on deposit accounts $ 68 $ 16 $ 1 $ 1 $ — $ 86 Cards and payment processing income 47 2 — — — 49 Trust and investment management services 7 1 — 36 — 44 Insurance income 8 1 — 11 1 21 Other Income 10 — 1 3 — 14 Net revenue from contracts with customers $ 140 $ 20 $ 2 $ 51 $ 1 $ 214 Noninterest income within the scope of other GAAP topics 35 51 1 — 13 100 Total noninterest income $ 175 $ 71 $ 3 $ 51 $ 14 $ 314 Huntington generally provides services for customers in which it acts as principal. Payment terms and conditions vary amongst services and customers, and thus impact the timing and amount of revenue recognition. Some fees may be paid before any service is rendered and accordingly, such fees are deferred until the obligations pertaining to those fees are satisfied. Most Huntington contracts with customers are cancelable by either party without penalty or they are short-term in nature, with a contract duration of less than one year. Accordingly, most revenue deferred for the reporting period ended March 31, 2019 is expected to be earned within one year. Huntington does not have significant balances of contract assets or contract liabilities and any change in those balances during the reporting period ended March 31, 2019 was determined to be immaterial.

FAIR VALUES OF ASSETS AND LIABI

FAIR VALUES OF ASSETS AND LIABILITIES	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
FAIR VALUES OF ASSETS AND LIABILITIES	FAIR VALUES OF ASSETS AND LIABILITIES See Note 17 “Fair Value of Assets and Liabilities” to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2018 for a description of the valuation methodologies used for instruments measured at fair value. Assets and liabilities measured at fair value rarely transfer between Level 1 and Level 2 measurements. There were no such transfers during the three-month periods ended March 31, 2019 and 2018 . 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, 2019 and December 31, 2018 are summarized below: Fair Value Measurements at Reporting Date Using Netting Adjustments (1) March 31, 2019 (dollar amounts in millions) Level 1 Level 2 Level 3 Assets Trading account securities: Federal agencies: Other agencies $ — $ 2 $ — $ — $ 2 Municipal securities — 86 — — 86 Other securities 77 1 — — 78 77 89 — — 166 Available-for-sale securities: U.S. Treasury securities 5 — — — 5 Residential CMOs — 7,010 — — 7,010 Residential MBS — 1,373 — — 1,373 Commercial MBS — 1,553 — — 1,553 Other agencies — 118 — — 118 Municipal securities — 281 3,237 — 3,518 Asset-backed securities — 349 — — 349 Corporate debt — 52 — — 52 Other securities/sovereign debt — 4 — — 4 5 10,740 3,237 — 13,982 Other securities 23 — — — 23 Loans held for sale — 523 — — 523 Loans held for investment — 50 29 — 79 MSRs — — 10 — 10 Derivative assets 1 513 8 (259 ) 263 Liabilities Derivative liabilities 8 360 3 (284 ) 87 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 (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 three-month periods ended March 31, 2019 and 2018 , 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 Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Loans held for investment Opening balance $ 10 $ 2 $ 3,165 $ 30 Transfers out of Level 3 (1) — (9 ) — — Total gains/losses for the period: Included in earnings — 12 1 — Included in OCI — — 43 — Purchases/originations — — 81 — Sales — — — — Repayments — — — (1 ) Settlements — — (53 ) — Closing balance $ 10 $ 5 $ 3,237 $ 29 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ — $ 2 $ — $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period $ — $ — $ 43 $ — Level 3 Fair Value Measurements 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) — (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 $ — $ — $ — $ — (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. 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, 2019 and 2018 : Level 3 Fair Value Measurements Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Loans held for investment Classification of gains and losses in earnings: Mortgage banking income $ — $ 12 $ — $ — Securities gains (losses) — — — — Interest and fee income — — 1 — Total $ — $ 12 $ 1 $ — Level 3 Fair Value Measurements 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 ) $ — 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, 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 $ 523 $ 506 $ 17 $ — $ — $ — Loans held for investment 79 86 (7 ) 6 7 (1 ) December 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 $ 613 $ 594 $ 19 $ — $ — $ — Loans held for investment 79 87 (8 ) 6 7 (1 ) The following tables present the net gains (losses) from fair value changes for the three-month periods ended March 31, 2019 and 2018 . Net gains (losses) from fair value changes (dollar amounts in millions) Three Months Ended March 31, Assets 2019 2018 Loans held for sale (1) $ (2 ) $ (2 ) Loans held for investment — — (1) The net gains (losses) from fair value changes are included in Mortgage banking income on the Unaudited Condensed Consolidated Statements of Income. 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 March 31, 2019 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 Impaired loans 49 — — 49 — Other real estate owned 6 — — 6 (4 ) 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 March 31, 2019 . 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 March 31, 2019 and December 31, 2018 : Quantitative Information about Level 3 Fair Value Measurements at March 31, 2019 (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% - 27 % 8 % Spread over forward interest rate swap rates 5% - 11 % 9 % Derivative assets 8 Consensus Pricing Net market price (3)% - 11 % 3 % Estimated Pull through % 2% - 100 % 88 % Derivative liabilities 3 Discounted cash flow Estimated conversion factor 163 % Estimated growth rate of Visa Class A shares 7 % Discount rate 3 % Timing of the resolution of the litigation 6/30/2020 Municipal securities 3,237 Discounted cash flow Discount rate 3% - 3 % 3 % Cumulative default 0 % - 39 % 3 % Loss given default 5% - 90 % 24 % Loans held for investment 29 Discounted cash flow Discount rate 7% - 8 % 8 % Constant prepayment rate 8% - 12 % 9 % Measured at fair value on a nonrecurring basis: Impaired loans 49 Appraisal value NA NA Other real estate owned 6 Appraisal value NA NA 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 0 % - 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 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 March 31, 2019 and December 31, 2018 : March 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 $ 1,483 $ — $ — $ 1,483 $ 1,483 Trading account securities — — 166 166 166 Available-for-sale securities — — 13,982 13,982 13,982 Held-to-maturity securities 8,747 — — 8,747 8,591 Other securities 463 — 23 486 486 Loans held for sale — 170 523 693 696 Net loans and leases (1) 74,236 — 79 74,315 74,160 Derivatives — — 263 263 263 Financial Liabilities Deposits 82,155 — — 82,155 82,130 Short-term borrowings 2,862 — — 2,862 2,862 Long-term debt 9,400 — — 9,400 9,610 Derivatives — — 87 87 87 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 (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, 2019 and December 31, 2018 : Estimated Fair Value Measurements at Reporting Date Using March 31, 2019 (dollar amounts in millions) Level 1 Level 2 Level 3 Financial Assets Trading account securities $ 77 $ 89 $ — $ 166 Available-for-sale securities 5 10,740 3,237 13,982 Held-to-maturity securities — 8,591 — 8,591 Other securities (1) 23 — — 23 Loans held for sale — 523 173 696 Net loans and direct financing leases — 50 74,110 74,160 Financial Liabilities Deposits — 74,859 7,271 82,130 Short-term borrowings 2 — 2,860 2,862 Long-term debt — 9,016 594 9,610 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 (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.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS Derivative financial instruments are recorded in the Unaudited Condensed Consolidated Balance Sheets as either an asset or a liability (in other assets or other liabilities, respectively) and measured at fair value. Derivative financial instruments can be designated as accounting hedges under GAAP. Designating a derivative as an accounting hedge allows Huntington to recognize gains and losses on the hedging instruments in same income statement line item where the gains and losses on the hedged item are recognized. Gains and losses on derivatives that are not designated to an effective hedge relationship under GAAP immediately impact earnings within the period they occur. The following table presents the fair values of all derivative instruments included in the Unaudited Condensed Consolidated Balance Sheets at March 31, 2019 and December 31, 2018 . Amounts in the table below are presented gross without the impact of any net collateral arrangements. March 31, 2019 December 31, 2018 (dollar amounts in millions) Asset Liability Asset Liability Derivatives designated as Hedging Instruments Interest rate contracts $ 95 $ 30 $ 44 $ 42 Derivatives not designated as Hedging Instruments Interest rate contracts 276 188 261 165 Foreign exchange contracts 18 16 23 19 Commodities contracts 133 131 172 168 Equity contracts — 6 — 10 Total Contracts $ 522 $ 371 $ 500 $ 404 The following table presents the amount of gain or loss recognized in income for derivatives not designated as hedging instruments under ASC Subtopic 815-10 in the Unaudited Condensed Consolidated Income Statement for the three-month periods ended March 31, 2019 and March 31, 2018 , respectively. Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative Three months ended March 31, (dollar amounts in millions) 2019 2018 Interest rate contracts: Customer Capital markets fees $ 10 $ 7 Mortgage Banking Mortgage banking income 12 (8 ) Foreign exchange contracts Capital markets fees 8 6 Commodities contracts Capital markets fees (6 ) 2 Equity contracts Other noninterest expense (1 ) (1 ) Total $ 23 $ 6 Derivatives used in asset and liability management activities Huntington engages in balance sheet hedging activity, principally for asset liability management purposes, to convert fixed rate assets or liabilities into floating rate or vice versa. Balance sheet hedging activity is generally arranged to receive hedge accounting treatment that can be classified as either fair value or cash flow hedges. Fair value hedges are executed to convert fixed rate liabilities to floating rate. Cash flow hedges are used to convert floating rate assets into fixed rate assets. The following table presents the gross notional values of derivatives used in Huntington’s asset and liability management activities at March 31, 2019 and December 31, 2018 , identified by the underlying interest rate-sensitive instruments. March 31, 2019 (dollar amounts in millions) Fair Value Hedges Cash Flow Hedges Economic Hedges Total Instruments associated with: Loans $ — $ 2,750 $ — $ 2,750 Investment securities — 12 — 12 Long-term debt 5,790 — — 5,790 Unassigned (1) — — 1,000 1,000 Total notional value at March 31, 2019 $ 5,790 $ 2,762 $ 1,000 $ 9,552 December 31, 2018 (dollar amounts in millions) Fair Value Hedges Cash Flow Hedges Total Instruments associated with: Investment securities $ — $ 12 $ 12 Long-term debt 4,865 — 4,865 Total notional value at December 31, 2018 $ 4,865 $ 12 $ 4,877 (1) Huntington purchased $1.0 billion of interest rate floors in the first quarter to economically hedge the impact of potential interest rate decreases. These contracts will be measured at fair value with changes in fair value recognized in other noninterest income. The following table presents additional information about the interest rate swaps and floors used in Huntington’s asset and liability management activities at March 31, 2019 and December 31, 2018 . March 31, 2019 Weighted-Average Rate (dollar amounts in millions) Notional Value Average Maturity (years) Fair Value Receive Pay Asset conversion swaps Receive fixed—generic $ 12 1.0 $ — 2.20 % 2.48 % Liability conversion swaps Receive fixed—generic 5,790 2.5 53 2.24 2.54 Total swap portfolio at March 31, 2019 $ 5,802 2.5 $ 53 2.24 % 2.54 % March 31, 2019 (dollar amounts in millions) Notional Value Average Maturity (years) Fair Value Purchased floors Purchased interest rate floors $ 3,750 1.8 $ 12 Total floors portfolio at March 31, 2019 $ 3,750 1.8 $ 12 December 31, 2018 Weighted-Average Rate (dollar amounts in millions) Notional Value Average Maturity (years) Fair Value Receive Pay Asset conversion swaps Receive fixed—generic $ 12 1.2 $ — 2.20 % 2.46 % Liability conversion swaps Receive fixed—generic $ 4,865 2.6 $ 2 2.24 % 2.54 % Total swap portfolio at December 31, 2018 $ 4,877 2.6 $ 2 2.24 % 2.54 % These derivative financial instruments were entered into for the purpose of managing the interest rate risk of assets and liabilities. With the exception of $1.0 billion of interest rate floors that are economically hedging interest rate decreases, net amounts receivable or payable on contracts hedging either interest earning assets or interest bearing liabilities were accrued as an adjustment to either interest income or interest expense. The net amounts resulted in an increase (decrease) to net interest income of $(14) million and $1 million for the three-month periods ended March 31, 2019 , and 2018 , respectively. Fair Value Hedges The changes in fair value of the fair value hedges are recorded through earnings and offset against changes in the fair value of the hedged item. The following table presents the change in fair value for derivatives designated as fair value hedges as well as the offsetting change in fair value on the hedged item for the three-month periods ended March 31, 2019 and 2018 . Three Months Ended (dollar amounts in millions) 2019 2018 Interest rate contracts Change in fair value of interest rate swaps hedging long-term debt (1) $ 41 $ (68 ) Change in fair value of hedged long term debt (1) (41 ) 71 (1) Recognized in Interest expense—long-term debt in the Unaudited Condensed Consolidated Statements of Income . As of March 31, 2019 and December 31, 2018 , the following amounts were recorded on the balance sheet related to cumulative basis adjustments for fair value hedges. Carrying Amount of the Hedged Liabilities Cumulative Amount of Fair Value Hedging Adjustment To Hedged Liabilities (dollar amounts in millions) March 31, 2019 December 31, 2018 March 31, 2019 December 31, 2018 Long-term debt $ 6,498 $ 4,845 $ 29 $ (12 ) The cumulative amount of fair value hedging adjustments remaining for any hedged assets and liabilities for which hedge accounting has been discontinued was $(119) million and $(127) million at March 31, 2019 and December 31, 2018 , respectively. Cash Flow Hedges During the first quarter of 2019, Huntington purchased $2.8 billion of interest rate floors and designated them as cash flow hedges for variable rate commercial loans indexed to LIBOR. These interest rate floors will reduce the potential adverse effect of interest rate decreases on future interest income. Huntington will receive interest payments when the interest rate indexed to LIBOR falls below the strike price mentioned in the contracts. The contracts are measured at fair value with any change in fair value related to intrinsic value recognized in OCI and reclassified into earnings when the cash flows related to the hedged item impact earnings. Any change in fair value related to time value is recognized in OCI. The initial premium paid for these contracts represents the time value of the contracts and is not included in the measurement of hedge effectiveness. The premium is amortized on straight line basis as a reduction to interest income over the contractual life of these contracts. Gains and losses on derivatives instruments related to loans and investment securities are recorded in interest income and interest expense, respectively. Derivatives used in mortgage banking activities Mortgage loan origination hedging activity Hunting ton’s mortgage origination hedging activity is related to economically hedging Huntington's mortgage pricing commitments to customers and the secondary sale to third parties. The value of a newly originated mortgage is not firm until the interest rate is committed or locked. The net asset (liability) position of these derivatives at March 31, 2019 and December 31, 2018 are less than one million and $(4) million , respectively. At March 31, 2019 and December 31, 2018 , Huntington had commitments to sell residential real estate loans of $0.9 billion and $0.8 billion , respectively. These contracts mature in less than 1 year . MSR hedging activity Huntington’s MSR economic hedging activity uses securities and derivatives to manage the value of the MSR asset and to mitigate the various types of risk inherent in the MSR asset, including risks related to duration, basis, convexity, volatility, and yield curve. The hedging instruments include forward commitments, interest rate swaps, and options on interest rate swaps. The notional value of the derivative financial instruments, corresponding trading assets and liabilities, and net trading gains (losses) related to MSR hedging activity is summarized in the following table: (dollar amounts in millions) March 31, 2019 December 31, 2018 Notional Value $ 650 $ — Trading Assets 4 — Trading Liabilities 1 — Three months ended March 31, (dollar amounts in millions) 2019 2018 Trading gains (losses) $ 7 $ — Trading gains (losses) are included in mortgage banking income in the Unaudited Condensed Consolidated Statement of Income. Derivatives used in customer related activities Various derivative financial instruments are offered to enable customers to meet their financing and investing objectives and for their risk management purposes. Derivative financial instruments used in trading activities consist of commodity, interest rate, and foreign exchange contracts. Huntington enters into offsetting third-party contracts with approved, reputable counterparties with substantially matching terms and currencies in order to economically hedge significant exposure related to derivatives used in trading activities. The interest rate or price risk of customer derivatives is mitigated by entering into similar derivatives having offsetting terms with other counterparties. The credit risk to these customers is evaluated and included in the calculation of fair value. Foreign currency derivatives help the customer hedge risk and reduce exposure to fluctuations in exchange rates. Transactions are primarily in liquid currencies with Canadian dollars and Euros comprising a majority of all transactions. Commodity derivatives help the customer hedge risk and reduce exposure to fluctuations in the price of various commodities. Hedging of energy-related products and base metals comprise the majority of all transactions. The net fair values of these derivative financial instruments, for which the gross amounts are included in other assets or other liabilities at both March 31, 2019 and December 31, 2018 , were $82 million and $92 million , respectively. The total notional values of derivative financial instruments used by Huntington on behalf of customers, including offsetting derivatives, were $28 billion and $26 billion at March 31, 2019 and December 31, 2018 , respectively. Huntington’s credit risk from customer derivatives was $237 million and $132 million at the same dates, respectively. Visa ® -related Swaps In connection with the sale of Huntington’s Class B Visa ® shares, Huntington entered into a swap agreement with the purchaser of the shares. The swap agreement adjusts for dilution in the conversion ratio of Class B shares resulting from changes in the Visa ® litigation. In connection with the FirstMerit acquisition, Huntington acquired an additional Visa ® related swap agreement. At March 31, 2019 , the combined fair value of the swap liabilities of $3 million is an estimate of the exposure liability based upon Huntington’s assessment of the potential Visa ® litigation losses and timing of the litigation settlement. Financial assets and liabilities that are offset in the Unaudited Condensed Consolidated Balance Sheets Huntington records derivatives at fair value as further described in Note 11 " Fair Values of Assets and Liabilities ". Derivative balances are presented on a net basis taking into consideration the effects of legally enforceable master netting agreements. Additionally, collateral exchanged with counterparties is also netted against the applicable derivative fair values. Huntington enters into derivative transactions with two primary groups: broker-dealers and banks, and Huntington’s customers. Different methods are utilized for managing counterparty credit exposure and credit risk for each of these groups. Huntington enters into transactions with broker-dealers and banks for various risk management purposes. These types of transactions generally are high dollar volume. Huntington enters into collateral and master netting agreements with these counterparties, and routinely exchanges cash and high quality securities collateral. Huntington enters into transactions with customers to meet their financing, investing, payment and risk management needs. These types of transactions generally are low dollar volume. Huntington enters into master netting agreements with customer counterparties; however, collateral is generally not exchanged with customer counterparties. At March 31, 2019 and December 31, 2018 , aggregate credit risk associated with these derivatives, net of collateral that has been pledged by the counterparty, was $21 million and $37 million , respectively. The credit risk associated with interest rate swaps is calculated after considering master netting agreements with broker-dealers and banks. At March 31, 2019 , Huntington pledged $80 million of investment securities and cash collateral to counterparties, while other counterparties pledged $76 million of investment securities and cash collateral to Huntington to satisfy collateral netting agreements. In the event of credit downgrades, Huntington would not be required to provide additional collateral. The following tables present the gross amounts of these assets and liabilities with any offsets to arrive at the net amounts recognized in the Unaudited Condensed Consolidated Balance Sheets at March 31, 2019 and December 31, 2018 . Offsetting of Financial Assets and Derivative Assets Gross amounts Net amounts of Gross amounts not offset in the (dollar amounts in millions) Gross amounts of recognized assets Financial instruments Cash collateral received Net amount March 31, 2019 Derivatives $ 522 $ (259 ) $ 263 $ (4 ) $ (21 ) $ 238 December 31, 2018 Derivatives 500 (291 ) 209 (4 ) (53 ) 152 Offsetting of Financial Liabilities and Derivative Liabilities Gross amounts offset in the unaudited condensed consolidated balance sheets Net amounts of liabilities presented in the unaudited condensed consolidated balance sheets Gross amounts not offset in the unaudited condensed consolidated balance sheets (dollar amounts in millions) Gross amounts of recognized liabilities Financial instruments Cash collateral received Net amount March 31, 2019 Derivatives $ 371 $ (284 ) $ 87 $ — $ (15 ) $ 72 December 31, 2018 Derivatives 404 (217 ) 187 — (12 ) 175

VIEs

VIEs	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
VIEs	VIEs Unconsolidated VIEs The following tables provide a summary of the assets and liabilities included in Huntington’s Unaudited Condensed Consolidated Financial Statements, as well as the maximum exposure to losses, associated with its interests related to unconsolidated VIEs for which Huntington holds an interest, but is not the primary beneficiary, to the VIE at March 31, 2019 , and December 31, 2018 : March 31, 2019 (dollar amounts in millions) Total Assets Total Liabilities Maximum Exposure to Loss Trust Preferred Securities $ 14 $ 252 $ — Affordable Housing Tax Credit Partnerships 685 314 685 Other Investments 150 59 150 Total $ 849 $ 625 $ 835 December 31, 2018 (dollar amounts in millions) Total Assets Total Liabilities Maximum Exposure to Loss Trust Preferred Securities $ 14 $ 252 $ — Affordable Housing Tax Credit Partnerships 708 357 708 Other Investments 126 53 126 Total $ 848 $ 662 $ 834 Trust-Preferred Securities Huntington has certain wholly-owned trusts whose assets, liabilities, equity, income, and expenses are not included within Huntington’s Unaudited Condensed Consolidated Financial Statements. These trusts have been formed for the sole purpose of issuing trust-preferred securities, from which the proceeds are then invested in Huntington junior subordinated debentures, which are reflected in Huntington’s Unaudited Condensed Consolidated Balance Sheet as long-term debt. The trust securities are the obligations of the trusts, and as such, are not consolidated within Huntington’s Unaudited Condensed Consolidated Financial Statements. A list of trust preferred securities outstanding at March 31, 2019 follows: (dollar amounts in millions) Rate Principal amount of subordinated note/ debenture issued to trust (1) Investment in unconsolidated subsidiary Huntington Capital I 3.29 % (2) $ 70 $ 6 Huntington Capital II 3.22 (3) 32 3 Sky Financial Capital Trust III 3.99 (4) 72 2 Sky Financial Capital Trust IV 3.99 (4) 74 2 Camco Financial Trust 3.92 (5) 4 1 Total $ 252 $ 14 (1) Represents the principal amount of debentures issued to each trust, including unamortized original issue discount. (2) Variable effective rate at March 31, 2019 , based on three-month LIBOR + 0.70% . (3) Variable effective rate at March 31, 2019 , based on three-month LIBOR + 0.625% . (4) Variable effective rate at March 31, 2019 , based on three-month LIBOR + 1.40% . (5) Variable effective rate at March 31, 2019 , based on three-month LIBOR + 1.33% . Each issue of the junior subordinated debentures has an interest rate equal to the corresponding trust securities distribution rate. Huntington has the right to defer payment of interest on the debentures at any time, or from time-to-time for a period not exceeding five years provided that no extension period may extend beyond the stated maturity of the related debentures. During any such extension period, distributions to the trust securities will also be deferred and Huntington’s ability to pay dividends on its common stock will be restricted. Periodic cash payments and payments upon liquidation or redemption with respect to trust securities are guaranteed by Huntington to the extent of funds held by the trusts. The guarantee ranks subordinate and junior in right of payment to all indebtedness of the Company to the same extent as the junior subordinated debt. The guarantee does not place a limitation on the amount of additional indebtedness that may be incurred by Huntington. Affordable Housing Tax Credit Partnerships Huntington makes certain equity investments in various limited partnerships that sponsor affordable housing projects utilizing the LIHTC pursuant to Section 42 of the Internal Revenue Code. The purpose of these investments is to achieve a satisfactory return on capital, to facilitate the sale of additional affordable housing product offerings, and to assist in achieving goals associated with the Community Reinvestment Act. The primary activities of the limited partnerships include the identification, development, and operation of multi-family housing that is leased to qualifying residential tenants. Generally, these types of investments are funded through a combination of debt and equity. Huntington uses the proportional amortization method to account for a majority of its investments in these entities. These investments are included in other assets. Investments that do not meet the requirements of the proportional amortization method are accounted for using the equity method. Investment losses related to these investments are included in noninterest income in the Unaudited Condensed Consolidated Statements of Income. The following table presents the balances of Huntington’s affordable housing tax credit investments and related unfunded commitments at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) March 31, December 31, Affordable housing tax credit investments $ 1,146 $ 1,147 Less: amortization (461 ) (439 ) Net affordable housing tax credit investments $ 685 $ 708 Unfunded commitments $ 314 $ 357 The following table presents other information relating to Huntington’s affordable housing tax credit investments for the three-month periods ended March 31, 2019 and 2018 . Three Months Ended (dollar amounts in millions) 2019 2018 Tax credits and other tax benefits recognized $ 27 $ 23 Proportional amortization method Tax credit amortization expense included in provision for income taxes 22 19 There were no material sales of affordable housing tax credit investments during the three-month periods ended March 31, 2019 and 2018 . There was no impairment recognized for the three-month periods ended March 31, 2019 and 2018 . Other Investments Other investments determined to be VIE's include investments in Small Business Investment Companies, Historic Tax Credit Investments, certain equity method investments, automobile securitizations and other miscellaneous investments.

COMMITMENTS AND CONTINGENT LIAB

COMMITMENTS AND CONTINGENT LIABILITIES	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENT LIABILITIES	COMMITMENTS AND CONTINGENT LIABILITIES Commitments to extend credit In the ordinary course of business, Huntington makes various commitments to extend credit that are not reflected in the Unaudited Condensed Consolidated Financial Statements. The contract amounts of these financial agreements at March 31, 2019 and December 31, 2018 , were as follows: (dollar amounts in millions) March 31, December 31, Contract amount representing credit risk Commitments to extend credit: Commercial $ 17,377 $ 17,149 Consumer 15,129 14,974 Commercial real estate 1,302 1,188 Standby letters of credit 644 676 Commercial letters-of-credit 9 14 Commitments to extend credit generally have fixed expiration dates, are variable-rate, and contain clauses that permit Huntington to terminate or otherwise renegotiate the contracts in the event of a significant deterioration in the customer’s credit quality. These arrangements normally require the payment of a fee by the customer, the pricing of which is based on prevailing market conditions, credit quality, probability of funding, and other relevant factors. Since many of these commitments are expected to expire without being drawn upon, the contract amounts are not necessarily indicative of future cash requirements. Standby letters-of-credit are conditional commitments issued to guarantee the performance of a customer to a third-party. These guarantees are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing, and similar transactions. Most of these arrangements mature within two years . The carrying amount of deferred revenue associated with these guarantees was $14 million and $13 million at March 31, 2019 and December 31, 2018 , respectively. Commercial letters-of-credit represent short-term, self-liquidating instruments that facilitate customer trade transactions and generally have maturities of no longer than 90 days . The goods or cargo being traded normally secure these instruments. Litigation and Regulatory Matters The following supplements the disclosure in Note 20 - Commitments and Contingencies to the Consolidated Financial Statements of the Corporation’s 2018 Annual Report on Form 10-K. In the ordinary course of business, Huntington is routinely a defendant in or party to pending and threatened legal and regulatory actions and proceedings. In view of the inherent difficulty of predicting the outcome of such matters, particularly where the claimants seek very large or indeterminate damages or where the matters present novel legal theories or involve a large number of parties, Huntington generally cannot predict what the eventual outcome of the pending matters will be, what the timing of the ultimate resolution of these matters will be, or what the eventual loss, fines or penalties related to each matter may be. Huntington establishes an accrued liability when those matters present loss contingencies that are both probable and estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. Huntington thereafter continues to monitor the matter for further developments that could affect the amount of the accrued liability that has been previously established. For certain matters, Huntington is able to estimate a range of possible loss. In cases in which Huntington possesses information to estimate a range of possible loss, that estimate is aggregated and disclosed below. There may be other matters for which a loss is probable or reasonably possible but such an estimate of the range of possible loss may not be possible. For those matters where an estimate of the range of possible loss is possible, management currently estimates the aggregate range of possible loss is $0 to $25 million at March 31, 2019 in excess of the accrued liability (if any) related to those matters. This estimated range of possible loss is based upon currently available information and is subject to significant judgment and a variety of assumptions, and known and unknown uncertainties. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from the current estimate. The estimated range of possible loss does not represent Huntington’s maximum loss exposure. Based on current knowledge, management does not believe that loss contingencies arising from pending matters will have a material adverse effect on the consolidated financial position of Huntington. Further, management believes that amounts accrued are adequate to address Huntington’s contingent liabilities. However, in light of the inherent uncertainties involved in these matters, some of which are beyond Huntington’s control, and the large or indeterminate damages sought in some of these matters, an adverse outcome in one or more of these matters could be material to Huntington’s results of operations for any particular reporting period.

SEGMENT REPORTING

SEGMENT REPORTING	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
SEGMENT REPORTING	SEGMENT REPORTING Huntington's business segments are based on our internally-aligned segment leadership structure, which is how management monitors results and assesses performance. The Company has four major business segments: Consumer and Business Banking , Commercial Banking , Vehicle Finance , Regional Banking and The Huntington Private Client Group (RBHPCG) . The Treasury / Other function includes technology and operations, other unallocated assets, liabilities, revenue, and expense. Business segment results are determined based upon Huntington's management reporting system, which assigns balance sheet and income statement items to each of the business segments. The process is designed around the organizational and management structure and, accordingly, the results derived are not necessarily comparable with similar information published by other financial institutions. Additionally, because of the interrelationships of the various segments, the information presented is not indicative of how the segments would perform if they operated as independent entities. Revenue is recorded in the business segment responsible for the related product or service. Fee sharing is recorded to allocate portions of such revenue to other business segments involved in selling to, or providing service to customers. Results of operations for the business segments reflect these fee-sharing allocations. The management process that develops the business segment reporting utilizes various estimates and allocation methodologies to measure the performance of the business segments. Expenses are allocated to business segments using a two-phase approach. The first phase consists of measuring and assigning unit costs (activity-based costs) to activities related to product origination and servicing. These activity-based costs are then extended, based on volumes, with the resulting amount allocated to business segments that own the related products. The second phase consists of the allocation of overhead costs to all four business segments from Treasury / Other . Huntington utilizes a full-allocation methodology, where all Treasury / Other expenses, except reported Significant Items, if any, and a small amount of other residual unallocated expenses, are allocated to the four business segments. The management policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to GAAP. As a result, reported segment results are not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures result in changes in reported segment financial data. Accordingly, certain amounts have been reclassified to conform to the current period presentation. Huntington uses an active and centralized FTP methodology to attribute appropriate net interest income to the business segments. The intent of the FTP methodology is to transfer interest rate risk from the business segments by providing matched duration funding of assets and liabilities. The result is to centralize the financial impact, management, and reporting of interest rate risk in the Treasury / Other function where it can be centrally monitored and managed. The Treasury / Other function charges (credits) an internal cost of funds for assets held in (or pays for funding provided by) each business segment. The FTP rate is based on prevailing market interest rates for comparable duration assets (or liabilities). In the first quarter of 2019, the Company updated its FTP methodology primarily related to the allocation of deposit funding costs. Prior period amounts presented below have been restated to reflect the new methodology. Consumer and Business Banking - The Consumer and Business Banking segment, including Home Lending, provides a wide array of financial products and services to consumer and small business customers including but not limited to checking accounts, savings accounts, money market accounts, certificates of deposit, mortgage loans, consumer loans, credit cards, and small business loans and investment products. Other financial services available to consumer and small business customers include insurance, interest rate risk protection, foreign exchange, and treasury management. Business Banking is defined as serving companies with revenues up to $20 million . Home Lending supports origination and servicing of consumer loans and mortgages for customers who are generally located in our primary banking markets across all segments. Commercial Banking - Through a relationship banking model, this segment provides a wide array of products and services to the middle market, large corporate, real estate and government public sector customers located primarily within our geographic footprint. The segment is divided into six business units: Middle Market, Specialty Banking, Asset Finance, Capital Markets/Institutional Corporate Banking, Commercial Real Estate and Treasury Management. Vehicle Finance - Our products and services include providing financing to consumers for the purchase of automobiles, light-duty trucks, recreational vehicles and marine craft at franchised and other select dealerships, and providing financing to franchised dealerships for the acquisition of new and used inventory. Products and services are delivered through highly specialized relationship-focused bankers and product partners. Regional Banking and The Huntington Private Client Group - The core business of The Huntington Private Client Group is The Huntington Private Bank, which consists of Private Banking, Wealth & Investment Management, and Retirement Plan Services. The Huntington Private Bank provides high net-worth customers with deposit, lending (including specialized lending options), and banking services. The Huntington Private Bank also delivers wealth management and legacy planning through investment and portfolio management, fiduciary administration, and trust services. This group also provides retirement plan services to corporate businesses. The Huntington Private Client Group provides corporate trust services and institutional and mutual fund custody services. Listed in the table below is certain operating basis financial information reconciled to Huntington’s March 31, 2019 , December 31, 2018 , and March 31, 2018 , reported results by business segment. Three Months Ended March 31, Income Statements Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated (dollar amounts in millions) 2019 Net interest income $ 443 $ 264 $ 94 $ 50 $ (29 ) $ 822 Provision (benefit) for credit losses 17 43 9 (2 ) — 67 Noninterest income 174 76 2 51 16 319 Noninterest expense 401 142 38 64 8 653 Provision (benefit) for income taxes 42 32 10 8 (29 ) 63 Net income (loss) $ 157 $ 123 $ 39 $ 31 $ 8 $ 358 2018 Net interest income $ 446 $ 276 $ 99 $ 57 $ (108 ) $ 770 Provision (benefit) for credit losses 32 21 14 (1 ) — 66 Noninterest income 175 71 3 51 14 314 Noninterest expense 412 118 34 57 12 633 Provision (benefit) for income taxes 37 44 11 11 (44 ) 59 Net income (loss) $ 140 $ 164 $ 43 $ 41 $ (62 ) $ 326 Assets at Deposits at (dollar amounts in millions) March 31, December 31, March 31, December 31, Consumer & Business Banking $ 25,334 $ 27,486 $ 52,354 $ 50,300 Commercial Banking 33,749 34,818 20,543 23,185 Vehicle Finance 19,263 19,435 327 346 RBHPCG 6,259 6,540 5,959 6,809 Treasury / Other 23,598 20,502 2,972 4,134 Total $ 108,203 $ 108,781 $ 82,155 $ 84,774

ACCOUNTING STANDARDS UPDATE (Po

ACCOUNTING STANDARDS UPDATE (Policies)	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
ACCOUNTING STANDARDS UPDATE	ACCOUNTING STANDARDS UPDATE Accounting standards adopted in current period Standard Summary of guidance Effects on financial statements ASU 2016-02 - Leases. Issued February 2016 - New lease accounting model for lessees and lessors. For lessees, virtually all leases will be required to be recognized on the balance sheet by recording a right-of-use asset and lease liability. Subsequent accounting for leases varies depending on whether the lease is classified as an operating lease or a finance lease. - Accounting applied by a lessor is largely unchanged from that applied under previous guidance. - Requires additional qualitative and quantitative disclosures with the objective of enabling users of the financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. - Effective for the fiscal period beginning after December 15, 2018, with early application permitted. - Management adopted the guidance on January 1, 2019, and elected certain practical expedients offered by the FASB, including foregoing the restatement of comparative periods upon adoption. Management also excluded short-term leases from the recognition of right-of-use asset and lease liabilities. Additionally, Huntington elected the transition relief allowed by FASB in foregoing reassessment of the following: whether any existing contracts were or contained leases, the classification of existing leases, and the determination of initial direct costs for existing leases. - Huntington recognized right-of-use assets of approximately $200 million offset by lease liabilities of approximately $250 million upon adoption, representing substantially all of its operating lease commitments, with the difference attributable to transition adjustments required by ASC Topic 842 relating to previously recognized amounts for deferred rent and lease exit costs (recorded pursuant to ASC Topic 420). Right-of-use assets and lease liabilities were based, primarily, on the present value of unpaid future minimum lease payments. Additionally, the amounts were impacted by assumptions around renewals and/or extensions, and the interest rate used to discount those future lease obligations. Impact to the income statement was not material in the current period. - Existing sale and leaseback guidance, including the detailed guidance applicable to sale-leasebacks of real estate, was replaced with a new model applicable to all assets, which will apply equally to both lessees and lessors. Under the new standard, if the transaction meets sale criteria, the seller-lessee will recognize the sale based on the new revenue recognition standard (when control transfers to the buyer-lessor), derecognizing the asset sold and replacing it with a right-of-use asset and lease liability for the leaseback. If the transaction is at fair value, the seller-lessee shall recognize a gain or loss on sale at that time. - Costs related to exiting an operating lease before the end of its contractual term have been historically accounted for pursuant to ASC Topic 420, with the recognition of a liability measured at the present value of remaining lease payments reduced by any expected sublease income upon the exit of that space. ASC Topic 842 changes the accounting for such costs, with entities evaluating the impairment of right-of-use assets using the guidance in ASC Topic 360. Such an impairment analysis would occur once the entity commits to a plan to abandon the space, which may accelerate the timing of these costs. - The new standard defines initial direct costs as those that would not have been incurred if the lease had not been obtained. Certain incremental costs previously eligible for capitalization, such as internal overhead, will now be expensed. Standard Summary of guidance Effects on financial statements ASU 2019-01 - Leases (ASC Topic 842): Codification Improvements Issued: March 2019 - Notes that lessors that are not manufacturers or dealers will apply the fair value exception in a manner similar to what they did prior to the implementation of ASC Topic 842. - Clarifies that lessors in the scope of ASC Topic 942 (Financial Services - Depository & Lending) must classify principal payments received from sales-type and direct financing leases in investing activities in the statement of cash flows. - Eliminates certain interim transition disclosure requirements related to the effect of an accounting change on certain interim period financial information. - The amendments relating to lessor accounting are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. - Huntington adopted the guidance concurrent with the adoption of ASU 2016-02 on January 1, 2019. The amendment did not have a material impact on Huntington's Unaudited Condensed Consolidated Financial Statements. Accounting standards yet to be adopted Standard Summary of guidance Effects on financial statements ASU 2016-13 - Financial Instruments - Credit Losses. Issued June 2016 - Eliminates the probable recognition threshold for credit losses on financial assets measured at amortized cost, replacing the current incurred loss model with an expected credit loss model. - Requires those financial assets subject to the new standard to be presented at the net amount expected to be collected (i.e., net of expected credit losses). - Measurement of expected credit losses should be based on relevant information including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. – The standard will require additional quantitative and qualitative disclosures to help users of the financial statements understand the credit risk inherent in Huntington’s portfolio and how management monitors the portfolio’s credit quality. - Effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018. - Adoption will be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. - Management intends to adopt the guidance on January 1, 2020 and has formed a working group comprised of teams from different disciplines including credit, finance, and risk management that has evaluated the requirements of the new standard and the impact it will have on our processes, systems and controls. This group is now working through implementing those identified process, system and control changes. - Huntington is continuing the process of developing credit models as well as accounting, reporting, and governance processes to comply with the new standard. For certain portfolios, development is complete and model implementation and validation is underway. Model development is anticipated to be substantially completed during the second quarter of 2019, and implementation and validation substantially completed during the third quarter of 2019. – The standard eliminates the current accounting model for purchased-credit-impaired loans, but requires an allowance to be recognized for purchased-credit-deteriorated (PCD) assets (those that have experienced more-than-insignificant deterioration in credit quality since origination). Huntington does not expect a material impact from PCD assets upon adoption. – Upon adoption, Huntington does not expect to record a material allowance with respect to HTM and AFS securities as the portfolios consist primarily of agency-backed securities that inherently have minimal nonpayment risk. ASU 2017-04 - Simplifying the Test for Goodwill Impairment. Issued January 2017 - Simplifies the goodwill impairment test by eliminating Step 2 of the goodwill impairment process, which requires an entity to determine the implied fair value of its goodwill by assigning fair value to all its assets and liabilities. - Entities will instead recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. - Entities will still have the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. - Effective for annual and interim goodwill tests performed in fiscal years beginning after December 15, 2019. Early adoption is permitted. - The amendment is not expected to have a material impact on Huntington's Unaudited Condensed Consolidated Financial Statements.

LOANS _ LEASES AND ALLOWANCE _2

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loan and Lease Portfolio	The following table provides a detailed listing of Huntington’s loan and lease portfolio at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) March 31, 2019 December 31, 2018 Loans and leases: Commercial and industrial $ 30,972 $ 30,605 Commercial real estate 6,795 6,842 Automobile 12,272 12,429 Home equity 9,551 9,722 Residential mortgage 10,885 10,728 RV and marine 3,344 3,254 Other consumer 1,260 1,320 Loans and leases $ 75,079 $ 74,900 Allowance for loan and lease losses (764 ) (772 ) Net loans and leases $ 74,315 $ 74,128
NALs and Past Due Loans	The following table presents NALs by loan class at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) March 31, December 31, Commercial and industrial $ 271 $ 188 Commercial real estate 9 15 Automobile 4 5 Home equity 64 62 Residential mortgage 68 69 RV and marine 1 1 Other consumer — — Total nonaccrual loans $ 417 $ 340
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 March 31, 2019 and December 31, 2018 : March 31, 2019 Past Due (1) Loans Accounted for Under FVO Total Loans 90 or (dollar amounts in millions) 30-59 60-89 90 or Total Current Commercial and industrial $ 49 $ 18 $ 48 $ 115 $ 30,857 $ — $ 30,972 $ 3 (2) Commercial real estate 1 3 4 8 6,787 — 6,795 — Automobile 64 13 7 84 12,188 — 12,272 6 Home equity 46 18 56 120 9,429 2 9,551 15 Residential mortgage 116 38 151 305 10,503 77 10,885 116 (3) RV and marine 9 2 2 13 3,331 — 3,344 2 Other consumer 12 6 5 23 1,237 — 1,260 5 Total loans and leases $ 297 $ 98 $ 273 $ 668 $ 74,332 $ 79 $ 75,079 $ 147 December 31, 2018 Past Due (1) Loans Accounted for Under FVO Total Loans 90 or (dollar amounts in millions) 30-59 60-89 90 or Total Current Commercial and industrial 72 17 51 140 30,465 — 30,605 7 (2) Commercial real estate 10 — 5 15 6,827 — 6,842 — Automobile 95 19 10 124 12,305 — 12,429 8 Home equity 51 21 56 128 9,593 1 9,722 17 Residential mortgage 108 47 168 323 10,327 78 10,728 131 (3) RV and marine 12 3 2 17 3,237 — 3,254 1 Other consumer 14 7 6 27 1,293 — 1,320 6 Total loans and leases $ 362 $ 114 $ 298 $ 774 $ 74,047 $ 79 $ 74,900 $ 170 (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. (3) Amounts include mortgage loans insured by U.S. government agencies.
ALLL and AULC activity by portfolio segment	The following table presents ALLL and AULC activity by portfolio segment for the three-month periods ended March 31, 2019 and 2018 . (dollar amounts in millions) Commercial Consumer Total Three-month period ended March 31, 2019: ALLL balance, beginning of period $ 542 $ 230 $ 772 Loan charge-offs (45 ) (52 ) (97 ) Recoveries of loans previously charged-off 12 14 26 Provision for loan and lease losses 36 27 63 ALLL balance, end of period $ 545 $ 219 $ 764 AULC balance, beginning of period $ 94 $ 2 $ 96 Provision (reduction in allowance) for unfunded loan commitments and letters of credit 4 — 4 AULC balance, end of period $ 98 $ 2 $ 100 ACL balance, end of period $ 643 $ 221 $ 864 (dollar amounts in millions) Commercial Consumer Total Three-month period ended March 31, 2018: ALLL balance, beginning of period $ 482 $ 209 $ 691 Loan charge-offs (23 ) (50 ) (73 ) Recoveries of loans previously charged-off 20 15 35 Provision for loan and lease losses 36 32 68 ALLL balance, end of period $ 515 $ 206 $ 721 AULC balance, beginning of period $ 84 $ 3 $ 87 Provision (reduction in allowance) for unfunded loan commitments and letters of credit (2 ) — (2 ) AULC balance, end of period $ 82 $ 3 $ 85 ACL balance, end of period $ 597 $ 209 $ 806
Loan and lease balances by credit quality indicator	The following table presents each loan and lease class by credit quality indicator at March 31, 2019 and December 31, 2018 . March 31, 2019 (dollar amounts in millions) Credit Risk Profile by UCS Classification Commercial Pass OLEM Substandard Doubtful Total Commercial and industrial $ 29,038 $ 563 $ 1,365 $ 6 $ 30,972 Commercial real estate 6,513 207 73 2 6,795 Credit Risk Profile by FICO Score (1), (2) Consumer 750+ 650-749 <650 Other (3) Total Automobile $ 6,111 $ 4,491 $ 1,388 $ 282 $ 12,272 Home equity 5,977 2,915 604 53 9,549 Residential mortgage 7,293 2,782 606 127 10,808 RV and marine 2,138 1,005 112 89 3,344 Other consumer 472 607 134 47 1,260 December 31, 2018 (dollar amounts in millions) Credit Risk Profile by UCS Classification Commercial Pass OLEM Substandard Doubtful Total Commercial and industrial $ 28,807 $ 518 $ 1,269 $ 11 $ 30,605 Commercial real estate 6,586 181 74 1 6,842 Credit Risk Profile by FICO Score (1), (2) Consumer 750+ 650-749 <650 Other (3) Total Automobile $ 6,254 $ 4,520 $ 1,373 $ 282 $ 12,429 Home equity 6,098 2,975 591 56 9,720 Residential mortgage 7,159 2,801 612 78 10,650 RV and marine 2,074 990 105 85 3,254 Other consumer 501 633 129 57 1,320 (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 at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) Commercial Consumer Total ALLL at March 31, 2019 Portion of ALLL balance: Attributable to loans individually evaluated for impairment $ 50 $ 9 $ 59 Attributable to loans collectively evaluated for impairment 495 210 705 Total ALLL balance $ 545 $ 219 $ 764 Loan and Lease Ending Balances at March 31, 2019 (1) Portion of loan and lease ending balance: Individually evaluated for impairment $ 610 $ 589 $ 1,199 Collectively evaluated for impairment 37,157 36,644 73,801 Total loans and leases evaluated for impairment $ 37,767 $ 37,233 $ 75,000 (1) Excludes loans accounted for under the fair value option. (dollar amounts in millions) Commercial Consumer Total ALLL at December 31, 2018 Portion of ALLL balance: Attributable to loans individually evaluated for impairment $ 33 $ 10 $ 43 Attributable to loans collectively evaluated for impairment 509 220 729 Total ALLL balance: $ 542 $ 230 $ 772 Loan and Lease Ending Balances at December 31, 2018 (1) Portion of loan and lease ending balances: Individually evaluated for impairment 516 591 1,107 Collectively evaluated for impairment 36,931 36,783 73,714 Total loans and leases evaluated for impairment $ 37,447 $ 37,374 $ 74,821 (1) Excludes loans accounted for under the fair value option.
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: (1) March 31, 2019 Three Months Ended (dollar amounts in millions) Ending Balance Unpaid Principal Balance (6) Related Allowance (7) Average Balance Interest Income Recognized With no related allowance recorded: Commercial and industrial $ 207 $ 235 $ — $ 215 $ 6 Commercial real estate 40 44 — 38 2 With an allowance recorded: Commercial and industrial 328 362 48 274 2 Commercial real estate 35 40 2 35 — Automobile 40 43 2 39 1 Home equity 311 351 11 313 3 Residential mortgage 287 322 4 287 3 RV and marine 3 3 — 2 — Other consumer 9 9 2 9 — Total Commercial and industrial (3) 535 597 48 489 8 Commercial real estate (4) 75 84 2 73 2 Automobile (2) 40 43 2 39 1 Home equity (5) 311 351 11 313 3 Residential mortgage (5) 287 322 4 287 3 RV and marine (2) 3 3 — 2 — Other consumer (2) 9 9 2 9 — December 31, 2018 Three Months Ended (dollar amounts in millions) Ending Balance Unpaid Principal Balance (6) Related Allowance (7) Average Balance Interest Income Recognized With no related allowance recorded: Commercial and industrial $ 224 $ 261 $ — $ 264 $ 5 Commercial real estate 36 45 — 63 2 With an allowance recorded: Commercial and industrial 221 240 31 286 3 Commercial real estate 35 39 2 47 — Automobile 38 42 2 36 1 Home equity 314 356 10 334 3 Residential mortgage 287 323 4 308 3 RV and marine 2 3 — 2 — Other consumer 9 9 3 7 — Total Commercial and industrial (3) 445 501 31 550 8 Commercial real estate (4) 71 84 2 110 2 Automobile (2) 38 42 2 36 1 Home equity (5) 314 356 10 334 3 Residential mortgage (5) 287 323 4 308 3 RV and marine (2) 2 3 — 2 — Other consumer (2) 9 9 3 7 — (1) These tables do not include loans fully charged-off. (2) All automobile, RV and marine, and other consumer impaired loans included in these tables are considered impaired due to their status as a TDR. (3) At March 31, 2019 and December 31, 2018 , C&I loans of $356 million and $366 million , respectively, were considered impaired due to their status as a TDR. (4) At March 31, 2019 and December 31, 2018 , CRE loans of $66 million and $60 million , respectively, were considered impaired due to their status as a TDR. (5) Includes home equity and residential mortgages considered impaired due to collateral dependent designation associated with their non-accrual status as well as home equity and mortgage loans considered impaired due to their status as a TDR. (6) The differences between the ending balance and unpaid principal balance amounts primarily represent partial charge-offs. (7) Impaired loans in the consumer portfolio are evaluated in pools and not at the loan level. Thus, these loans do not have an individually assigned allowance and as such are all classified as with an allowance in the tables above.
Detailed troubled debt restructuring information by class	The following table presents, by class and modification type, the number of contracts, post-modification outstanding balance, and the financial effects of the modification for the three-month periods ended March 31, 2019 and 2018 . New Troubled Debt Restructurings (1) Three Months Ended March 31, 2019 Number of Post-modification Outstanding Recorded Investment (2) (dollar amounts in millions) Interest rate reduction Amortization or maturity date change Chapter 7 bankruptcy Other Total Commercial and industrial 115 $ — $ 35 $ — $ — $ 35 Commercial real estate 8 — 9 — — 9 Automobile 744 — 5 2 — 7 Home equity 104 — 3 2 — 5 Residential mortgage 76 — 8 — — 8 RV and marine 36 — — 1 — 1 Other consumer 244 1 — — — 1 Total new TDRs 1,327 $ 1 $ 60 $ 5 $ — $ 66 Three Months Ended March 31, 2018 Number of Post-modification Outstanding Recorded Investment (2) (dollar amounts in millions) Interest rate reduction Amortization or maturity date change Chapter 7 bankruptcy Other Total Commercial and industrial 241 $ — $ 96 $ — $ — $ 96 Commercial real estate 48 — 32 — — 32 Automobile 627 — 4 2 — 6 Home equity 144 — 5 3 — 8 Residential mortgage 83 — 9 — — 9 RV and marine 19 — — — — — Other consumer 441 2 — — — 2 Total new TDRs 1,603 $ 2 $ 146 $ 5 $ — $ 153 (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 financial effects of modification represent the financial impact via provision (recovery) for loan and lease losses as a result of the modification and were $(3) million and $(3) million at March 31, 2019 and March 31, 2018 , respectively.

INVESTMENT SECURITIES AND OTH_2

INVESTMENT SECURITIES AND OTHER SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Gain (Loss) on Securities [Table Text Block]	.
Unrealized Gain (Loss) on Investments [Table Text Block]	The following tables provide amortized cost, fair value, and gross unrealized gains and losses by investment category at March 31, 2019 and December 31, 2018 : Unrealized (dollar amounts in millions) Amortized Cost Gross Gains Gross Losses Fair Value March 31, 2019 Available-for-sale securities: U.S. Treasury $ 5 $ — $ — $ 5 Federal agencies: Residential CMO 7,093 25 (108 ) 7,010 Residential MBS 1,359 19 (5 ) 1,373 Commercial MBS 1,606 — (53 ) 1,553 Other agencies 119 — (1 ) 118 Total U.S. Treasury, federal agency and other agency securities 10,182 44 (167 ) 10,059 Municipal securities 3,539 17 (38 ) 3,518 Asset-backed securities 350 2 (3 ) 349 Corporate debt 51 1 — 52 Other securities/Sovereign debt 4 — — 4 Total available-for-sale securities $ 14,126 $ 64 $ (208 ) $ 13,982 Held-to-maturity securities: Federal agencies: Residential CMO $ 2,125 $ 4 $ (23 ) $ 2,106 Residential MBS 2,093 11 (15 ) 2,089 Commercial MBS 4,187 1 (130 ) 4,058 Other agencies 338 — (4 ) 334 Total federal agency and other agency securities 8,743 16 (172 ) 8,587 Municipal securities 4 — — 4 Total held-to-maturity securities $ 8,747 $ 16 $ (172 ) $ 8,591 Other securities, at cost: Non-marketable equity securities: Federal Home Loan Bank stock $ 167 $ — $ — $ 167 Federal Reserve Bank stock 296 — — 296 Other securities, at fair value Mutual funds 21 — — 21 Marketable equity securities 1 1 — 2 Total other securities $ 485 $ 1 $ — $ 486 Unrealized (dollar amounts in millions) Amortized Gross Gross Fair Value December 31, 2018 Available-for-sale securities: U.S. Treasury $ 5 $ — $ — $ 5 Federal agencies: Residential CMO 7,185 15 (201 ) 6,999 Residential MBS 1,261 9 (15 ) 1,255 Commercial MBS 1,641 — (58 ) 1,583 Other agencies 128 — (2 ) 126 Total U.S. Treasury, federal agency and other agency securities 10,220 24 (276 ) 9,968 Municipal securities 3,512 6 (78 ) 3,440 Asset-backed securities 318 1 (4 ) 315 Corporate debt 54 — (1 ) 53 Other securities/Sovereign debt 4 — — 4 Total available-for-sale securities $ 14,108 $ 31 $ (359 ) $ 13,780 Held-to-maturity securities: Federal agencies: Residential CMO $ 2,124 $ — $ (47 ) $ 2,077 Residential MBS 1,851 2 (42 ) 1,811 Commercial MBS 4,235 — (186 ) 4,049 Other agencies 350 — (6 ) 344 Total federal agency and other agency securities 8,560 2 (281 ) 8,281 Municipal securities 5 — — 5 Total held-to-maturity securities $ 8,565 $ 2 $ (281 ) $ 8,286 Other securities, at cost: Non-marketable equity securities: Federal Home Loan Bank stock $ 248 $ — $ — $ 248 Federal Reserve Bank stock 295 — — 295 Other securities, at fair value Mutual funds 20 — — 20 Marketable equity securities 1 1 — 2 Total other securities $ 564 $ 1 $ — $ 565
Investments Classified by Contractual Maturity Date [Table Text Block]	The following table provides the amortized cost and fair value of securities by contractual maturity at March 31, 2019 and December 31, 2018 . Expected maturities may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without incurring penalties. March 31, 2019 December 31, 2018 (dollar amounts in millions) Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities: Under 1 year $ 258 $ 254 $ 186 $ 185 After 1 year through 5 years 1,028 1,018 1,057 1,039 After 5 years through 10 years 1,879 1,869 1,838 1,802 After 10 years 10,961 10,841 11,027 10,754 Total available-for-sale securities $ 14,126 $ 13,982 $ 14,108 $ 13,780 Held-to-maturity securities: Under 1 year $ — $ — $ — $ — After 1 year through 5 years 20 20 11 11 After 5 years through 10 years 344 341 362 356 After 10 years 8,383 8,230 8,192 7,919 Total held-to-maturity securities $ 8,747 $ 8,591 $ 8,565 $ 8,286
Schedule of Unrealized Loss on Investments [Table Text Block]	March 31, 2019 December 31, 2018 (dollar amounts in millions) Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities: Under 1 year $ 258 $ 254 $ 186 $ 185 After 1 year through 5 years 1,028 1,018 1,057 1,039 After 5 years through 10 years 1,879 1,869 1,838 1,802 After 10 years 10,961 10,841 11,027 10,754 Total available-for-sale securities $ 14,126 $ 13,982 $ 14,108 $ 13,780 Held-to-maturity securities: Under 1 year $ — $ — $ — $ — After 1 year through 5 years 20 20 11 11 After 5 years through 10 years 344 341 362 356 After 10 years 8,383 8,230 8,192 7,919 Total held-to-maturity securities $ 8,747 $ 8,591 $ 8,565 $ 8,286 The following tables provide detail on investment securities with unrealized losses aggregated by investment category and the length of time the individual securities have been in a continuous loss position at March 31, 2019 and December 31, 2018 : Less than 12 Months Over 12 Months Total (dollar amounts in millions) Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized March 31, 2019 Available-for-sale securities: Federal agencies: Residential CMO $ 27 $ — $ 5,287 $ (108 ) $ 5,314 $ (108 ) Residential MBS — — 537 (5 ) 537 (5 ) Commercial MBS — — 1,553 (53 ) 1,553 (53 ) Other agencies — — 116 (1 ) 116 (1 ) Total federal agency and other agency securities 27 — 7,493 (167 ) 7,520 (167 ) Municipal securities 593 (7 ) 1,867 (31 ) 2,460 (38 ) Asset-backed securities 56 (1 ) 153 (2 ) 209 (3 ) Total temporarily impaired securities $ 676 $ (8 ) $ 9,513 $ (200 ) $ 10,189 $ (208 ) Held-to-maturity securities: Federal agencies: Residential CMO $ — $ — $ 1,283 $ (23 ) $ 1,283 $ (23 ) Residential MBS — — 1,464 (15 ) 1,464 (15 ) Commercial MBS — — 4,049 (130 ) 4,049 (130 ) Other agencies 6 — 279 (4 ) 285 (4 ) Total federal agency and other agency securities 6 — 7,075 (172 ) 7,081 (172 ) Municipal securities — — 4 — 4 — Total temporarily impaired securities $ 6 $ — $ 7,079 $ (172 ) $ 7,085 $ (172 ) Less than 12 Months Over 12 Months Total (dollar amounts in millions) Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized December 31, 2018 Available-for-sale securities: Federal agencies: Residential CMO $ 425 $ (3 ) $ 5,943 $ (198 ) $ 6,368 $ (201 ) Residential MBS 259 (6 ) 319 (9 ) 578 (15 ) Commercial MBS 10 — 1,573 (58 ) 1,583 (58 ) Other agencies — — 124 (2 ) 124 (2 ) Total federal agency and other agency securities 694 (9 ) 7,959 (267 ) 8,653 (276 ) Municipal securities 1,425 (24 ) 1,602 (54 ) 3,027 (78 ) Asset-backed securities 95 (2 ) 117 (2 ) 212 (4 ) Corporate debt 40 — 1 (1 ) 41 (1 ) Total temporarily impaired securities $ 2,254 $ (35 ) $ 9,679 $ (324 ) $ 11,933 $ (359 ) Held-to-maturity securities: Federal agencies: Residential CMO $ 12 $ — $ 2,004 $ (47 ) $ 2,016 $ (47 ) Residential MBS 16 — 1,457 (42 ) 1,473 (42 ) Commercial MBS — — 4,041 (186 ) 4,041 (186 ) Other agencies 113 (2 ) 205 (4 ) 318 (6 ) Total federal agency and other agency securities 141 (2 ) 7,707 (279 ) 7,848 (281 ) Municipal securities — — 4 — 4 — Total temporarily impaired securities $ 141 $ (2 ) $ 7,711 $ (279 ) $ 7,852 $ (281 )

MORTGAGE LOAN SALES AND SERVI_2

MORTGAGE LOAN SALES AND SERVICING RIGHTS (Tables)	3 Months Ended
	Mar. 31, 2019
Transfers and Servicing [Abstract]
Summarizes activity relating to loans securitized sold with servicing retained	The following table summarizes activity relating to residential mortgage loans sold with servicing retained for the three-month periods ended March 31, 2019 and 2018 : Three Months Ended (dollar amounts in millions) 2019 2018 Residential mortgage loans sold with servicing retained $ 833 $ 843 Pretax gains resulting from above loan sales (1) 12 21 (1) Recorded in mortgage banking income.
Summarizes activity relating to loans sold with servicing retained using the amortization method	The following table summarizes the changes in MSRs recorded using the amortization method for the three-month periods ended March 31, 2019 and 2018 : Three Months Ended (dollar amounts in millions) 2019 2018 Carrying value, beginning of period $ 211 $ 191 New servicing assets created 9 10 Impairment recovery (charge) (9 ) 7 Amortization (9 ) (8 ) Carrying value, end of period $ 202 $ 200 Fair value, end of period $ 202 $ 205 Weighted-average life (years) 6.1 7.0
Summary of key assumptions and the sensitivity of the servicing rights value to changes in the assumptions	For MSRs under the amortization method, a summary of key assumptions and the sensitivity of the MSR value to changes in these assumptions at March 31, 2019 , and December 31, 2018 follows: March 31, 2019 December 31, 2018 Decline in fair value due to Decline in fair value due to (dollar amounts in millions) Actual 10% 20% Actual 10% 20% Constant prepayment rate (annualized) 11.40 % $ (6 ) $ (12 ) 9.40 % $ (6 ) $ (12 ) Spread over forward interest rate swap rates 886 bps (7 ) (13 ) 934 bps (7 ) (13 )

OPERATING LEASES (Tables)

OPERATING LEASES (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Assets And Liabilities, Lessee	Net lease assets and liabilities at March 31, 2019 are as follows: (dollar amounts in millions) Classification March 31, 2019 Assets Operating lease assets Other assets $ 203 Liabilities Lease liabilities Other liabilities $ 228
Lease, Cost	Cash flow supplemental information at March 31, 2019 are as follows: (dollar amounts in millions) Three Months Ended March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 14 Right-of-use assets obtained in exchange for lease obligations Operating leases 1 Lease term and discount rate as of March 31, 2019 are as follows: March 31, 2019 Weighted-average remaining lease term (years) Operating leases 7.3 Weighted-average discount rate Operating leases 4.73 % Net lease cost for the three months ended March 31, 2019 is as follows: (dollar amounts in millions) Classification Three Months Ended March 31, 2019 Operating lease cost Net occupancy $ 11 Sublease income Net occupancy (1 ) Net lease cost $ 10
Lessee, Operating Lease, Liability, Maturity	Maturity of lease liabilities at March 31, 2019 are as follows: (dollar amounts in millions) Total 2019 $ 36 2020 50 2021 36 2022 31 2023 26 Thereafter 93 Total lease payments $ 272 Less: Interest (44 ) Total $ 228

OTHER COMPREHENSIVE INCOME (Tab

OTHER COMPREHENSIVE INCOME (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Components of other comprehensive income	The components of Huntington's OCI for the three-month periods ended March 31, 2019 and 2018 , were as follows: Three Months Ended Tax (expense) (dollar amounts in millions) Pretax Benefit After-tax Unrealized gains (losses) on available-for-sale securities arising during the period $ 184 $ (41 ) $ 143 Less: Reclassification adjustment for realized net losses (gains) included in net income 4 (1 ) 3 Net change in unrealized holding gains (losses) on available-for-sale securities 188 (42 ) 146 Net change in fair value on cash flow hedges 8 (1 ) 7 Net change in pension and other post-retirement obligations 1 — 1 Total other comprehensive income (loss) $ 197 $ (43 ) $ 154 Three Months Ended Tax (expense) (dollar amounts in millions) Pretax Benefit After-tax Unrealized gains (losses) on available-for-sale securities arising during the period $ (206 ) $ 45 $ (161 ) Less: Reclassification adjustment for realized net losses (gains) included in net income 15 (3 ) 12 Net change in unrealized gains (losses) on available-for-sale securities (191 ) 42 (149 ) Net change in pension and other post-retirement obligations 1 — 1 Total other comprehensive income (loss) $ (190 ) $ 42 $ (148 )
Activity in accumulated other comprehensive income, net of tax	ctivity in accumulated OCI for the three -month periods ended March 31, 2019 and 2018 , were as follows: (dollar amounts in millions) Unrealized gains (losses) on debt securities (1) Change in fair value related to cash flow hedges Unrealized gains (losses) for pension and other post- retirement obligations Total Three Months Ended March 31, 2019 Balance, beginning of period $ (363 ) $ — $ (246 ) $ (609 ) Other comprehensive income before reclassifications 143 7 — 150 Amounts reclassified from accumulated OCI to earnings 3 — 1 4 Period change 146 7 1 154 Balance, end of period $ (217 ) $ 7 $ (245 ) $ (455 ) Three Months Ended March 31, 2018 Balance, beginning of period $ (278 ) $ — $ (250 ) $ (528 ) Cumulative-effect adjustments (ASU 2016-01) (1 ) (1 ) Other comprehensive income before reclassifications (161 ) — — (161 ) Amounts reclassified from accumulated OCI to earnings 12 — 1 13 Period change (149 ) — 1 (148 ) Balance, end of period $ (428 ) $ — $ (249 ) $ (677 ) (1) AOCI amounts at March 31, 2019 , December 31, 2018 and March 31, 2018 include $134 million , $137 million and $147 million , respectively, of net unrealized losses on securities transferred from the available-for-sale securities portfolio to the held-to-maturity securities portfolio. The net unrealized losses will be recognized in earnings over the remaining life of the security using the effective interest method.
Reclassification Out Of Accumulated OCI	The following table presents the reclassification adjustments out of accumulated OCI included in net income and the impacted line items as listed on the Unaudited Condensed Consolidated Statements of Income for the three-month periods ended March 31, 2019 and 2018 : Reclassifications out of accumulated OCI Accumulated OCI components Amounts reclassified from accumulated OCI Location of net gain (loss) reclassified from accumulated OCI into earnings Three Months Ended (dollar amounts in millions) March 31, 2019 March 31, 2018 Gains (losses) on debt securities: Amortization of unrealized gains (losses) $ (4 ) $ (3 ) Interest income - held-to-maturity securities - taxable Realized gain (loss) on sale of securities — (12 ) Noninterest income - net gains (losses) on sale of securities Total before tax (4 ) (15 ) Tax (expense) benefit 1 3 Net of tax $ (3 ) $ (12 ) Amortization of defined benefit pension and post-retirement items: Actuarial gains (losses) $ (2 ) $ 2 Noninterest income Net periodic benefit costs 1 (1 ) Noninterest income Total before tax (1 ) 1 Tax (expense) benefit — — Net of tax $ (1 ) $ 1

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Basic and diluted earnings loss per share	The calculation of basic and diluted earnings per share for the three -month periods ended March 31, 2019 and 2018 was as follows: Three Months Ended (dollar amounts in millions, except per data, share count in thousands) 2019 2018 Basic earnings per common share: Net income $ 358 $ 326 Preferred stock dividends (19 ) (12 ) Net income available to common shareholders $ 339 $ 314 Average common shares issued and outstanding 1,046,995 1,083,836 Basic earnings per common share $ 0.32 $ 0.29 Diluted earnings per common share: Dilutive potential common shares: Stock options and restricted stock units and awards 14,807 19,858 Shares held in deferred compensation plans 3,836 3,228 Dilutive impact of Preferred Stock — 17,856 Dilutive potential common shares 18,643 40,942 Total diluted average common shares issued and outstanding 1,065,638 1,124,778 Diluted earnings per common share $ 0.32 $ 0.28

NONINTEREST INCOME (Tables)

NONINTEREST INCOME (Tables)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Schedule of Noninterest Income	The following table shows Huntington’s total noninterest income segregated between contracts with customers within the scope of ASC 606 and those within the scope of other GAAP Topics. (dollar amounts in millions) Three Months Ended March 31, 2019 2018 Noninterest income Noninterest income from contracts with customers $ 222 $ 214 Noninterest income within the scope of other GAAP topics 97 100 Total noninterest income $ 319 $ 314 The following table illustrates the disaggregation by operating segment and major revenue stream and reconciles disaggregated revenue to segment revenue presented in Note 15 " Segment Reporting ". Three Months Ended March 31, 2019 (dollar amounts in millions) Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated Major Revenue Streams Service charges on deposit accounts $ 69 $ 16 $ 1 $ 1 $ — $ 87 Card and payment processing income 50 3 — — — 53 Trust and investment management services 8 — — 35 1 44 Insurance income 8 2 — 11 — 21 Other income 8 5 1 3 — 17 Net revenue from contracts with customers $ 143 $ 26 $ 2 $ 50 $ 1 $ 222 Noninterest income within the scope of other GAAP topics 31 50 — 1 15 97 Total noninterest income $ 174 $ 76 $ 2 $ 51 $ 16 $ 319 Three Months Ended March 31, 2018 (dollar amounts in millions) Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated Major Revenue Streams Service charges on deposit accounts $ 68 $ 16 $ 1 $ 1 $ — $ 86 Cards and payment processing income 47 2 — — — 49 Trust and investment management services 7 1 — 36 — 44 Insurance income 8 1 — 11 1 21 Other Income 10 — 1 3 — 14 Net revenue from contracts with customers $ 140 $ 20 $ 2 $ 51 $ 1 $ 214 Noninterest income within the scope of other GAAP topics 35 51 1 — 13 100 Total noninterest income $ 175 $ 71 $ 3 $ 51 $ 14 $ 314

FAIR VALUES OF ASSETS AND LIA_2

FAIR VALUES OF ASSETS AND LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 and December 31, 2018 are summarized below: Fair Value Measurements at Reporting Date Using Netting Adjustments (1) March 31, 2019 (dollar amounts in millions) Level 1 Level 2 Level 3 Assets Trading account securities: Federal agencies: Other agencies $ — $ 2 $ — $ — $ 2 Municipal securities — 86 — — 86 Other securities 77 1 — — 78 77 89 — — 166 Available-for-sale securities: U.S. Treasury securities 5 — — — 5 Residential CMOs — 7,010 — — 7,010 Residential MBS — 1,373 — — 1,373 Commercial MBS — 1,553 — — 1,553 Other agencies — 118 — — 118 Municipal securities — 281 3,237 — 3,518 Asset-backed securities — 349 — — 349 Corporate debt — 52 — — 52 Other securities/sovereign debt — 4 — — 4 5 10,740 3,237 — 13,982 Other securities 23 — — — 23 Loans held for sale — 523 — — 523 Loans held for investment — 50 29 — 79 MSRs — — 10 — 10 Derivative assets 1 513 8 (259 ) 263 Liabilities Derivative liabilities 8 360 3 (284 ) 87 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 (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 Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Loans held for investment Opening balance $ 10 $ 2 $ 3,165 $ 30 Transfers out of Level 3 (1) — (9 ) — — Total gains/losses for the period: Included in earnings — 12 1 — Included in OCI — — 43 — Purchases/originations — — 81 — Sales — — — — Repayments — — — (1 ) Settlements — — (53 ) — Closing balance $ 10 $ 5 $ 3,237 $ 29 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ — $ 2 $ — $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period $ — $ — $ 43 $ — Level 3 Fair Value Measurements 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) — (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 $ — $ — $ — $ — (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, 2019 and 2018 : Level 3 Fair Value Measurements Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Loans held for investment Classification of gains and losses in earnings: Mortgage banking income $ — $ 12 $ — $ — Securities gains (losses) — — — — Interest and fee income — — 1 — Total $ — $ 12 $ 1 $ — Level 3 Fair Value Measurements 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 ) $ —
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, 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 $ 523 $ 506 $ 17 $ — $ — $ — Loans held for investment 79 86 (7 ) 6 7 (1 ) December 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 $ 613 $ 594 $ 19 $ — $ — $ — Loans held for investment 79 87 (8 ) 6 7 (1 ) The following tables present the net gains (losses) from fair value changes for the three-month periods ended March 31, 2019 and 2018 . Net gains (losses) from fair value changes (dollar amounts in millions) Three Months Ended March 31, Assets 2019 2018 Loans held for sale (1) $ (2 ) $ (2 ) Loans held for investment — — (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 March 31, 2019 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 Impaired loans 49 — — 49 — Other real estate owned 6 — — 6 (4 )
Quantitative information about significant unobservable level 3 fair value measurement inputs	Quantitative Information about Level 3 Fair Value Measurements at March 31, 2019 (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% - 27 % 8 % Spread over forward interest rate swap rates 5% - 11 % 9 % Derivative assets 8 Consensus Pricing Net market price (3)% - 11 % 3 % Estimated Pull through % 2% - 100 % 88 % Derivative liabilities 3 Discounted cash flow Estimated conversion factor 163 % Estimated growth rate of Visa Class A shares 7 % Discount rate 3 % Timing of the resolution of the litigation 6/30/2020 Municipal securities 3,237 Discounted cash flow Discount rate 3% - 3 % 3 % Cumulative default 0 % - 39 % 3 % Loss given default 5% - 90 % 24 % Loans held for investment 29 Discounted cash flow Discount rate 7% - 8 % 8 % Constant prepayment rate 8% - 12 % 9 % Measured at fair value on a nonrecurring basis: Impaired loans 49 Appraisal value NA NA Other real estate owned 6 Appraisal value NA NA 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 0 % - 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
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, 2019 and December 31, 2018 : March 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 $ 1,483 $ — $ — $ 1,483 $ 1,483 Trading account securities — — 166 166 166 Available-for-sale securities — — 13,982 13,982 13,982 Held-to-maturity securities 8,747 — — 8,747 8,591 Other securities 463 — 23 486 486 Loans held for sale — 170 523 693 696 Net loans and leases (1) 74,236 — 79 74,315 74,160 Derivatives — — 263 263 263 Financial Liabilities Deposits 82,155 — — 82,155 82,130 Short-term borrowings 2,862 — — 2,862 2,862 Long-term debt 9,400 — — 9,400 9,610 Derivatives — — 87 87 87 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 (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, 2019 and December 31, 2018 : Estimated Fair Value Measurements at Reporting Date Using March 31, 2019 (dollar amounts in millions) Level 1 Level 2 Level 3 Financial Assets Trading account securities $ 77 $ 89 $ — $ 166 Available-for-sale securities 5 10,740 3,237 13,982 Held-to-maturity securities — 8,591 — 8,591 Other securities (1) 23 — — 23 Loans held for sale — 523 173 696 Net loans and direct financing leases — 50 74,110 74,160 Financial Liabilities Deposits — 74,859 7,271 82,130 Short-term borrowings 2 — 2,860 2,862 Long-term debt — 9,016 594 9,610 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

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Asset and liability derivatives included in accrued income and other assets	March 31, 2019 December 31, 2018 (dollar amounts in millions) Asset Liability Asset Liability Derivatives designated as Hedging Instruments Interest rate contracts $ 95 $ 30 $ 44 $ 42 Derivatives not designated as Hedging Instruments Interest rate contracts 276 188 261 165 Foreign exchange contracts 18 16 23 19 Commodities contracts 133 131 172 168 Equity contracts — 6 — 10 Total Contracts $ 522 $ 371 $ 500 $ 404
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges	The following table presents the amount of gain or loss recognized in income for derivatives not designated as hedging instruments under ASC Subtopic 815-10 in the Unaudited Condensed Consolidated Income Statement for the three-month periods ended March 31, 2019 and March 31, 2018 , respectively. Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative Three months ended March 31, (dollar amounts in millions) 2019 2018 Interest rate contracts: Customer Capital markets fees $ 10 $ 7 Mortgage Banking Mortgage banking income 12 (8 ) Foreign exchange contracts Capital markets fees 8 6 Commodities contracts Capital markets fees (6 ) 2 Equity contracts Other noninterest expense (1 ) (1 ) Total $ 23 $ 6
Gross notional values of derivatives used in asset and liability management activities	The following table presents the gross notional values of derivatives used in Huntington’s asset and liability management activities at March 31, 2019 and December 31, 2018 , identified by the underlying interest rate-sensitive instruments. March 31, 2019 (dollar amounts in millions) Fair Value Hedges Cash Flow Hedges Economic Hedges Total Instruments associated with: Loans $ — $ 2,750 $ — $ 2,750 Investment securities — 12 — 12 Long-term debt 5,790 — — 5,790 Unassigned (1) — — 1,000 1,000 Total notional value at March 31, 2019 $ 5,790 $ 2,762 $ 1,000 $ 9,552 December 31, 2018 (dollar amounts in millions) Fair Value Hedges Cash Flow Hedges Total Instruments associated with: Investment securities $ — $ 12 $ 12 Long-term debt 4,865 — 4,865 Total notional value at December 31, 2018 $ 4,865 $ 12 $ 4,877
Additional information about the interest rate swaps used in asset and liability management activities	The following table presents additional information about the interest rate swaps and floors used in Huntington’s asset and liability management activities at March 31, 2019 and December 31, 2018 . March 31, 2019 Weighted-Average Rate (dollar amounts in millions) Notional Value Average Maturity (years) Fair Value Receive Pay Asset conversion swaps Receive fixed—generic $ 12 1.0 $ — 2.20 % 2.48 % Liability conversion swaps Receive fixed—generic 5,790 2.5 53 2.24 2.54 Total swap portfolio at March 31, 2019 $ 5,802 2.5 $ 53 2.24 % 2.54 % March 31, 2019 (dollar amounts in millions) Notional Value Average Maturity (years) Fair Value Purchased floors Purchased interest rate floors $ 3,750 1.8 $ 12 Total floors portfolio at March 31, 2019 $ 3,750 1.8 $ 12 December 31, 2018 Weighted-Average Rate (dollar amounts in millions) Notional Value Average Maturity (years) Fair Value Receive Pay Asset conversion swaps Receive fixed—generic $ 12 1.2 $ — 2.20 % 2.46 % Liability conversion swaps Receive fixed—generic $ 4,865 2.6 $ 2 2.24 % 2.54 % Total swap portfolio at December 31, 2018 $ 4,877 2.6 $ 2 2.24 % 2.54 %
Increase or (decrease) to interest expense for derivatives designated as fair value hedges	The following table presents the change in fair value for derivatives designated as fair value hedges as well as the offsetting change in fair value on the hedged item for the three-month periods ended March 31, 2019 and 2018 . Three Months Ended (dollar amounts in millions) 2019 2018 Interest rate contracts Change in fair value of interest rate swaps hedging long-term debt (1) $ 41 $ (68 ) Change in fair value of hedged long term debt (1) (41 ) 71 (1) Recognized in Interest expense—long-term debt in the Unaudited Condensed Consolidated Statements of Income .
Amounts recorded on the balance sheet related to cumulative basis adjustments	As of March 31, 2019 and December 31, 2018 , the following amounts were recorded on the balance sheet related to cumulative basis adjustments for fair value hedges. Carrying Amount of the Hedged Liabilities Cumulative Amount of Fair Value Hedging Adjustment To Hedged Liabilities (dollar amounts in millions) March 31, 2019 December 31, 2018 March 31, 2019 December 31, 2018 Long-term debt $ 6,498 $ 4,845 $ 29 $ (12 ) The cumulative amount of fair value hedging adjustments remaining for any hedged assets and liabilities for which hedge accounting has been discontinued was $(119) million and $(127) million at March 31, 2019 and December 31, 2018 , respectively.
Offsetting of financial assets and derivatives assets	The following tables present the gross amounts of these assets and liabilities with any offsets to arrive at the net amounts recognized in the Unaudited Condensed Consolidated Balance Sheets at March 31, 2019 and December 31, 2018 . Offsetting of Financial Assets and Derivative Assets Gross amounts Net amounts of Gross amounts not offset in the (dollar amounts in millions) Gross amounts of recognized assets Financial instruments Cash collateral received Net amount March 31, 2019 Derivatives $ 522 $ (259 ) $ 263 $ (4 ) $ (21 ) $ 238 December 31, 2018 Derivatives 500 (291 ) 209 (4 ) (53 ) 152
Offsetting of financial liabilities and derivative liabilities	Offsetting of Financial Liabilities and Derivative Liabilities Gross amounts offset in the unaudited condensed consolidated balance sheets Net amounts of liabilities presented in the unaudited condensed consolidated balance sheets Gross amounts not offset in the unaudited condensed consolidated balance sheets (dollar amounts in millions) Gross amounts of recognized liabilities Financial instruments Cash collateral received Net amount March 31, 2019 Derivatives $ 371 $ (284 ) $ 87 $ — $ (15 ) $ 72 December 31, 2018 Derivatives 404 (217 ) 187 — (12 ) 175

VIEs (Tables)

VIEs (Tables)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Carrying amount and classification of the trusts assets and liabilities	The following tables provide a summary of the assets and liabilities included in Huntington’s Unaudited Condensed Consolidated Financial Statements, as well as the maximum exposure to losses, associated with its interests related to unconsolidated VIEs for which Huntington holds an interest, but is not the primary beneficiary, to the VIE at March 31, 2019 , and December 31, 2018 : March 31, 2019 (dollar amounts in millions) Total Assets Total Liabilities Maximum Exposure to Loss Trust Preferred Securities $ 14 $ 252 $ — Affordable Housing Tax Credit Partnerships 685 314 685 Other Investments 150 59 150 Total $ 849 $ 625 $ 835 December 31, 2018 (dollar amounts in millions) Total Assets Total Liabilities Maximum Exposure to Loss Trust Preferred Securities $ 14 $ 252 $ — Affordable Housing Tax Credit Partnerships 708 357 708 Other Investments 126 53 126 Total $ 848 $ 662 $ 834
Summary of Outstanding Trust Preferred Securities	A list of trust preferred securities outstanding at March 31, 2019 follows: (dollar amounts in millions) Rate Principal amount of subordinated note/ debenture issued to trust (1) Investment in unconsolidated subsidiary Huntington Capital I 3.29 % (2) $ 70 $ 6 Huntington Capital II 3.22 (3) 32 3 Sky Financial Capital Trust III 3.99 (4) 72 2 Sky Financial Capital Trust IV 3.99 (4) 74 2 Camco Financial Trust 3.92 (5) 4 1 Total $ 252 $ 14 (1) Represents the principal amount of debentures issued to each trust, including unamortized original issue discount. (2) Variable effective rate at March 31, 2019 , based on three-month LIBOR + 0.70% . (3) Variable effective rate at March 31, 2019 , based on three-month LIBOR + 0.625% . (4) Variable effective rate at March 31, 2019 , based on three-month LIBOR + 1.40% . (5) Variable effective rate at March 31, 2019 , based on three-month LIBOR + 1.33% .
Affordable housing tax credit investments	The following table presents the balances of Huntington’s affordable housing tax credit investments and related unfunded commitments at March 31, 2019 and December 31, 2018 . (dollar amounts in millions) March 31, December 31, Affordable housing tax credit investments $ 1,146 $ 1,147 Less: amortization (461 ) (439 ) Net affordable housing tax credit investments $ 685 $ 708 Unfunded commitments $ 314 $ 357 The following table presents other information relating to Huntington’s affordable housing tax credit investments for the three-month periods ended March 31, 2019 and 2018 . Three Months Ended (dollar amounts in millions) 2019 2018 Tax credits and other tax benefits recognized $ 27 $ 23 Proportional amortization method Tax credit amortization expense included in provision for income taxes 22 19

COMMITMENTS AND CONTINGENT LI_2

COMMITMENTS AND CONTINGENT LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Contract amounts of various commitments to extend credit	In the ordinary course of business, Huntington makes various commitments to extend credit that are not reflected in the Unaudited Condensed Consolidated Financial Statements. The contract amounts of these financial agreements at March 31, 2019 and December 31, 2018 , were as follows: (dollar amounts in millions) March 31, December 31, Contract amount representing credit risk Commitments to extend credit: Commercial $ 17,377 $ 17,149 Consumer 15,129 14,974 Commercial real estate 1,302 1,188 Standby letters of credit 644 676 Commercial letters-of-credit 9 14

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Listed in the table below is certain operating basis financial information reconciled to Huntington’s March 31, 2019 , December 31, 2018 , and March 31, 2018 , reported results by business segment. Three Months Ended March 31, Income Statements Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated (dollar amounts in millions) 2019 Net interest income $ 443 $ 264 $ 94 $ 50 $ (29 ) $ 822 Provision (benefit) for credit losses 17 43 9 (2 ) — 67 Noninterest income 174 76 2 51 16 319 Noninterest expense 401 142 38 64 8 653 Provision (benefit) for income taxes 42 32 10 8 (29 ) 63 Net income (loss) $ 157 $ 123 $ 39 $ 31 $ 8 $ 358 2018 Net interest income $ 446 $ 276 $ 99 $ 57 $ (108 ) $ 770 Provision (benefit) for credit losses 32 21 14 (1 ) — 66 Noninterest income 175 71 3 51 14 314 Noninterest expense 412 118 34 57 12 633 Provision (benefit) for income taxes 37 44 11 11 (44 ) 59 Net income (loss) $ 140 $ 164 $ 43 $ 41 $ (62 ) $ 326 Assets at Deposits at (dollar amounts in millions) March 31, December 31, March 31, December 31, Consumer & Business Banking $ 25,334 $ 27,486 $ 52,354 $ 50,300 Commercial Banking 33,749 34,818 20,543 23,185 Vehicle Finance 19,263 19,435 327 346 RBHPCG 6,259 6,540 5,959 6,809 Treasury / Other 23,598 20,502 2,972 4,134 Total $ 108,203 $ 108,781 $ 82,155 $ 84,774
Segment Disclosure of Assets and Deposits	Assets at Deposits at (dollar amounts in millions) March 31, December 31, March 31, December 31, Consumer & Business Banking $ 25,334 $ 27,486 $ 52,354 $ 50,300 Commercial Banking 33,749 34,818 20,543 23,185 Vehicle Finance 19,263 19,435 327 346 RBHPCG 6,259 6,540 5,959 6,809 Treasury / Other 23,598 20,502 2,972 4,134 Total $ 108,203 $ 108,781 $ 82,155 $ 84,774

LOANS _ LEASES AND ALLOWANCE _3

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)reserve	Dec. 31, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital Leases, Future Minimum Payments Receivable	$ 1,700
Total ALLL balance	764	$ 772	$ 721	$ 691
Loans and leases receivable net premium	$ 446	428
Number of days past due	30 days
Allowance number of reserves | reserve	2
Collateral for secured borrowings	$ 37,600	46,500
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ALLL balance	545	542	515	482
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total ALLL balance	$ 219	$ 230	$ 206	$ 209
Threshold period past due for write-off	120 days

LOANS _ LEASES AND ALLOWANCE _4

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan and Lease Portfolio Composition (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial		$ 30,972	$ 30,605
Commercial real estate		6,795	6,842
Automobile		12,272	12,429
Home equity		9,551	9,722
Residential mortgage		10,885	10,728
Recreation Finance		3,344	3,254
Other consumer		1,260	1,320
Loans and leases	[1]	75,079	74,900
Allowance for loan and lease losses		(764)	(772)	$ (721)	$ (691)
Net loans and leases		74,315	74,128
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Automobile		12,272	12,429
Home equity		9,549	9,720
Residential mortgage		10,808	10,650
Other consumer		1,260	1,320
Allowance for loan and lease losses		(219)	(230)	(206)	(209)
Consumer | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		12,272	12,429
Consumer | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		9,551	9,722
Consumer | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		10,885	10,728
Consumer | RV and Marine FInance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		3,344	3,254
Consumer | Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		1,260	1,320
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial		30,972	30,605
Commercial real estate		6,795	6,842
Allowance for loan and lease losses		(545)	(542)	$ (515)	$ (482)
Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		$ 30,972	$ 30,605
[1]	Amounts represent loans for which Huntington has elected the fair value option.

LOANS _ LEASES AND ALLOWANCE _5

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Direct Financing Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residual Value of Leased Asset	$ 96
Capital Leases, Future Minimum Payments Receivable, Next Twelve Months	600
Capital Leases, Future Minimum Payments, Receivable in Two Years	500
Capital Leases, Future Minimum Payments, Receivable in Three Years	300
Capital Leases, Future Minimum Payments, Receivable in Four Years	200
Capital Leases, Future Minimum Payments, Receivable in Five Years	100
Capital Leases, Future Minimum Payments, Receivable Thereafter	100
Direct Financing Lease, Interest Income	26
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	1,727	$ 1,747
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property	717	726
Capital Leases Gross Investment In Direct Financing Leases	2,444	2,473
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs	19	20
Capital Leases, Net Investment in Direct Financing Leases, Deferred Income	250	250
Capital Leases, Net Investment in Direct Financing Leases	$ 2,213	$ 2,243

LOANS _ LEASES AND ALLOWANCE _6

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans by Loan Class (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 417	$ 340
Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	271	188
Commercial | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	9	15
Consumer | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	4	5
Consumer | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	64	62
Consumer | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	68	69
Consumer | RV and Marine FInance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	1	1
Consumer | Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 0	$ 0

LOANS _ LEASES AND ALLOWANCE _7

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - NALs Past Due (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		$ 668	$ 774
Current		74,332	74,047
Consumer loans		79	79
Loans and leases	[1]	75,079	74,900
90 or more days past due and accruing		147	170
30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		297	362
60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		98	114
90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		273	298
Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		115	140
Current		30,857	30,465
Consumer loans		0	0
Loans and leases		30,972	30,605
90 or more days past due and accruing		3	7
Commercial | Commercial and Industrial | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		49	72
Commercial | Commercial and Industrial | 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		18	17
Commercial | Commercial and Industrial | 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		48	51
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		8	15
Current		6,787	6,827
Consumer loans		0	0
Loans and leases		6,795	6,842
90 or more days past due and accruing		0	0
Commercial | Real Estate | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		1	10
Commercial | Real Estate | 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		3	0
Commercial | Real Estate | 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		4	5
Consumer | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		84	124
Current		12,188	12,305
Consumer loans		0	0
Loans and leases		12,272	12,429
90 or more days past due and accruing		6	8
Consumer | Automobile | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		64	95
Consumer | Automobile | 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		13	19
Consumer | Automobile | 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		7	10
Consumer | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		120	128
Current		9,429	9,593
Consumer loans		2	1
Loans and leases		9,551	9,722
90 or more days past due and accruing		15	17
Consumer | Home Equity | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		46	51
Consumer | Home Equity | 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		18	21
Consumer | Home Equity | 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		56	56
Consumer | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		305	323
Current		10,503	10,327
Consumer loans		77	78
Loans and leases		10,885	10,728
90 or more days past due and accruing		116	131
Consumer | Residential Mortgage | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		116	108
Consumer | Residential Mortgage | 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		38	47
Consumer | Residential Mortgage | 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		151	168
Consumer | RV and Marine FInance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		13	17
Current		3,331	3,237
Consumer loans		0	0
Loans and leases		3,344	3,254
90 or more days past due and accruing		2	1
Consumer | RV and Marine FInance | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		9	12
Consumer | RV and Marine FInance | 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		2	3
Consumer | RV and Marine FInance | 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		2	2
Consumer | Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		23	27
Current		1,237	1,293
Consumer loans		0	0
Loans and leases		1,260	1,320
90 or more days past due and accruing		5	6
Consumer | Other Consumer | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		12	14
Consumer | Other Consumer | 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		6	7
Consumer | Other Consumer | 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due (1)		$ 5	$ 6
[1]	Amounts represent loans for which Huntington has elected the fair value option.

LOANS _ LEASES AND ALLOWANCE _8

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Portion of ALLL balance:
ALLL balance, beginning of period	$ 772	$ 691
Loan charge-offs	(97)	(73)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	26	35
Provision for Loan and Lease Losses	67	66
Provision For (Reduction In Allowance) Loan and Lease Losses.	63	68
ALLL balance, end of period	764	721
AULC Balance, beginning of period	96	87
Provision (reduction in allowance) for unfunded loan commitments and letters of credit	4	(2)
AULC Balance, end of period	100	85
ACL balance, end of period	864	806
Commercial
Portion of ALLL balance:
ALLL balance, beginning of period	542	482
Loan charge-offs	(45)	(23)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	12	20
Provision for Loan and Lease Losses		36
Provision For (Reduction In Allowance) Loan and Lease Losses.	36
ALLL balance, end of period	545	515
AULC Balance, beginning of period	94	84
Provision (reduction in allowance) for unfunded loan commitments and letters of credit	4	(2)
AULC Balance, end of period	98	82
ACL balance, end of period	643	597
Consumer
Portion of ALLL balance:
ALLL balance, beginning of period	230	209
Loan charge-offs	(52)	(50)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	14	15
Provision for Loan and Lease Losses		32
Provision For (Reduction In Allowance) Loan and Lease Losses.	27
ALLL balance, end of period	219	206
AULC Balance, beginning of period	2	3
Provision (reduction in allowance) for unfunded loan commitments and letters of credit	0	0
AULC Balance, end of period	2	3
ACL balance, end of period	$ 221	$ 209

LOANS _ LEASES AND ALLOWANCE _9

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	$ 30,972	$ 30,605
Commercial real estate	6,795	6,842
Automobile	12,272	12,429
Home equity	9,551	9,722
Residential mortgage	10,885	10,728
Other consumer	1,260	1,320
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	30,972	30,605
Commercial real estate	6,795	6,842
Commercial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	29,038	28,807
Commercial real estate	6,513	6,586
Commercial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	1,365	1,269
Commercial real estate	73	74
Commercial | OLEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	563	518
Commercial real estate	207	181
Commercial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	6	11
Commercial real estate	2	1
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Automobile	12,272	12,429
Home equity	9,549	9,720
Residential mortgage	10,808	10,650
RV and marine finance	3,344	3,254
Other consumer	1,260	1,320
Consumer | Greater than 750
Accounts, Notes, Loans and Financing Receivable [Line Items]
Automobile	6,111	6,254
Home equity	5,977	6,098
Residential mortgage	7,293	7,159
RV and marine finance	2,138	2,074
Other consumer	472	501
Consumer | 650-749
Accounts, Notes, Loans and Financing Receivable [Line Items]
Automobile	4,491	4,520
Home equity	2,915	2,975
Residential mortgage	2,782	2,801
RV and marine finance	1,005	990
Other consumer	607	633
Consumer | Less Than 650
Accounts, Notes, Loans and Financing Receivable [Line Items]
Automobile	1,388	1,373
Home equity	604	591
Residential mortgage	606	612
RV and marine finance	112	105
Other consumer	134	129
Consumer | Other FICO score
Accounts, Notes, Loans and Financing Receivable [Line Items]
Automobile	282	282
Home equity	53	56
Residential mortgage	127	78
RV and marine finance	89	85
Other consumer	$ 47	$ 57

LOANS _ LEASES AND ALLOWANCE_10

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Portion of ALLL balance:
Attributable to loans individually evaluated for impairment	$ 59	$ 43
Attributable to loans collectively evaluated for impairment	705	729
Total ALLL balance	764	772	$ 721	$ 691
Portion of loan and lease ending balance:
Collectively evaluated for impairment	73,801	73,714
Individually evaluated for impairment	1,199	1,107
Financing Receivable Evaluated For Impairment	75,000	74,821
Commercial
Portion of ALLL balance:
Attributable to loans individually evaluated for impairment	50	33
Attributable to loans collectively evaluated for impairment	495	509
Total ALLL balance	545	542	515	482
Portion of loan and lease ending balance:
Collectively evaluated for impairment	37,157	36,931
Individually evaluated for impairment	610	516
Financing Receivable Evaluated For Impairment	37,767	37,447
Consumer
Portion of ALLL balance:
Attributable to loans individually evaluated for impairment	9	10
Attributable to loans collectively evaluated for impairment	210	220
Total ALLL balance	219	230	$ 206	$ 209
Portion of loan and lease ending balance:
Collectively evaluated for impairment	36,644	36,783
Individually evaluated for impairment	589	591
Financing Receivable Evaluated For Impairment	$ 37,233	$ 37,374

LOANS _ LEASES AND ALLOWANCE_11

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance of impaired loans with no allowance recorded	$ 207		$ 224
Unpaid principal balance of impaired loans with no allowance recorded	235		261
Average balance of impaired loans with no allowance recorded	215	$ 264
Interest income recognized on impaired loans with no allowance recorded	6	5
Ending balance of impaired loans with allowance recorded	328		221
Unpaid principal balance of impaired loans with allowance recorded	362		240
Related Allowance	48		31
Average balance of impaired loans with allowance recorded	274	286
Interest income recognized on impaired loans with allowance recorded	2	3
Impaired Financing Receivable, Recorded Investment	535		445
Impaired Financing Receivable, Unpaid Principal Balance	597		501
Impaired Financing Receivable, Average Recorded Investment	489	550
Impaired Financing Receivable, Interest Income, Accrual Method	8	8
Loans considered impaired due to status as a TDR	356		366
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance of impaired loans with no allowance recorded	40		36
Unpaid principal balance of impaired loans with no allowance recorded	44		45
Average balance of impaired loans with no allowance recorded	38	63
Interest income recognized on impaired loans with no allowance recorded	2	2
Ending balance of impaired loans with allowance recorded	35		35
Unpaid principal balance of impaired loans with allowance recorded	40		39
Related Allowance	2		2
Average balance of impaired loans with allowance recorded	35	47
Interest income recognized on impaired loans with allowance recorded	0	0
Impaired Financing Receivable, Recorded Investment	75		71
Impaired Financing Receivable, Unpaid Principal Balance	84		84
Impaired Financing Receivable, Average Recorded Investment	73	110
Impaired Financing Receivable, Interest Income, Accrual Method	2	2
Loans considered impaired due to status as a TDR	66		60
Consumer | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance of impaired loans with allowance recorded	40		38
Unpaid principal balance of impaired loans with allowance recorded	43		42
Related Allowance	2		2
Average balance of impaired loans with allowance recorded	39	36
Interest income recognized on impaired loans with allowance recorded	1	1
Impaired Financing Receivable, Recorded Investment	40		38
Impaired Financing Receivable, Unpaid Principal Balance	43		42
Impaired Financing Receivable, Average Recorded Investment	39	36
Impaired Financing Receivable, Interest Income, Accrual Method	1	1
Consumer | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance of impaired loans with allowance recorded	311		314
Unpaid principal balance of impaired loans with allowance recorded	351		356
Related Allowance	11		10
Average balance of impaired loans with allowance recorded	313	334
Interest income recognized on impaired loans with allowance recorded	3	3
Impaired Financing Receivable, Recorded Investment	311		314
Impaired Financing Receivable, Unpaid Principal Balance	351		356
Impaired Financing Receivable, Average Recorded Investment	313	334
Impaired Financing Receivable, Interest Income, Accrual Method	3	3
Consumer | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance of impaired loans with allowance recorded	287		287
Unpaid principal balance of impaired loans with allowance recorded	322		323
Related Allowance	4		4
Average balance of impaired loans with allowance recorded	287	308
Interest income recognized on impaired loans with allowance recorded	3	3
Impaired Financing Receivable, Recorded Investment	287		287
Impaired Financing Receivable, Unpaid Principal Balance	322		323
Impaired Financing Receivable, Average Recorded Investment	287	308
Impaired Financing Receivable, Interest Income, Accrual Method	3	3
Consumer | RV and Marine FInance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance of impaired loans with allowance recorded	3		2
Unpaid principal balance of impaired loans with allowance recorded	3		3
Related Allowance	0		0
Average balance of impaired loans with allowance recorded	2	2
Interest income recognized on impaired loans with allowance recorded	0	0
Impaired Financing Receivable, Recorded Investment	3		2
Impaired Financing Receivable, Unpaid Principal Balance	3		3
Impaired Financing Receivable, Average Recorded Investment	2	2
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Consumer | Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance of impaired loans with allowance recorded	9		9
Unpaid principal balance of impaired loans with allowance recorded	9		9
Related Allowance	2		3
Average balance of impaired loans with allowance recorded	9	7
Interest income recognized on impaired loans with allowance recorded	0	0
Impaired Financing Receivable, Recorded Investment	9		9
Impaired Financing Receivable, Unpaid Principal Balance	9		$ 9
Impaired Financing Receivable, Average Recorded Investment	9	7
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0

LOANS _ LEASES AND ALLOWANCE_12

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - TDRs (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)contract	Mar. 31, 2018USD ($)contract
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Number of Contracts | contract	1,327	1,603
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 66	$ 153
New Troubled Debt Restructuring, Financial effects of modification	3	3
Interest rate reduction
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	1	2
Amortization or maturity date change
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	60	146
Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	5	5
Other
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0
Commercial | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Number of Contracts | contract	115	241
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 35	$ 96
Commercial | Commercial and Industrial | Interest rate reduction
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Commercial | Commercial and Industrial | Amortization or maturity date change
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	35	96
Commercial | Commercial and Industrial | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Commercial | Commercial and Industrial | Other
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0
Commercial | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Number of Contracts | contract	8	48
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 9	$ 32
Commercial | Commercial Real Estate | Interest rate reduction
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Commercial | Commercial Real Estate | Amortization or maturity date change
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	9	32
Commercial | Commercial Real Estate | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Commercial | Commercial Real Estate | Other
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0
Consumer | Automobile
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Number of Contracts | contract	744	627
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 7	$ 6
Consumer | Automobile | Interest rate reduction
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Consumer | Automobile | Amortization or maturity date change
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	5	4
Consumer | Automobile | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	2	2
Consumer | Automobile | Other
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0
Consumer | Home Equity
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Number of Contracts | contract	104	144
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 5	$ 8
Consumer | Home Equity | Interest rate reduction
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Consumer | Home Equity | Amortization or maturity date change
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	3	5
Consumer | Home Equity | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	2	3
Consumer | Home Equity | Other
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0
Consumer | Residential Mortgage
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Number of Contracts | contract	76	83
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 8	$ 9
Consumer | Residential Mortgage | Interest rate reduction
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Consumer | Residential Mortgage | Amortization or maturity date change
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	8	9
Consumer | Residential Mortgage | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Consumer | Residential Mortgage | Other
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0
Consumer | RV and Marine FInance
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Number of Contracts | contract	36	19
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 1	$ 0
Consumer | RV and Marine FInance | Interest rate reduction
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Consumer | RV and Marine FInance | Amortization or maturity date change
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Consumer | RV and Marine FInance | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	1	0
Consumer | RV and Marine FInance | Other
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0
Consumer | Other Consumer
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Number of Contracts | contract	244	441
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 1	$ 2
Consumer | Other Consumer | Interest rate reduction
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	1	2
Consumer | Other Consumer | Amortization or maturity date change
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Consumer | Other Consumer | Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0
Consumer | Other Consumer | Other
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0

INVESTMENT SECURITIES AND OTH_3

INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 14,126,000,000	$ 14,108,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	64,000,000	31,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	208,000,000	359,000,000
Debt Securities, Available-for-sale	13,982,000,000	13,780,000,000
Debt Securities, Held-to-maturity	8,747,000,000	8,565,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	16,000,000	2,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(172,000,000)	(281,000,000)
Debt Securities, Held-to-maturity, Fair Value	8,591,000,000	8,286,000,000
Equity Securities, FV-NI, Cost	485,000,000	564,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax	1,000,000	1,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	486,000,000	565,000,000
US Treasury Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,000,000	5,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	5,000,000	5,000,000
Collateralized Mortgage Obligations [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,093,000,000	7,185,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	25,000,000	15,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	108,000,000	201,000,000
Debt Securities, Available-for-sale	7,010,000,000	6,999,000,000
Debt Securities, Held-to-maturity	2,125,000,000	2,124,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	4,000,000	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(23,000,000)	(47,000,000)
Debt Securities, Held-to-maturity, Fair Value	2,106,000,000	2,077,000,000
Residential Mortgage Backed Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,359,000,000	1,261,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	19,000,000	9,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	5,000,000	15,000,000
Debt Securities, Available-for-sale	1,373,000,000	1,255,000,000
Debt Securities, Held-to-maturity	2,093,000,000	1,851,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	11,000,000	2,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(15,000,000)	(42,000,000)
Debt Securities, Held-to-maturity, Fair Value	2,089,000,000	1,811,000,000
Commercial Mortgage Backed Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,606,000,000	1,641,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	53,000,000	58,000,000
Debt Securities, Available-for-sale	1,553,000,000	1,583,000,000
Debt Securities, Held-to-maturity	4,187,000,000	4,235,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,000,000	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(130,000,000)	(186,000,000)
Debt Securities, Held-to-maturity, Fair Value	4,058,000,000	4,049,000,000
Other Federal Agencies [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	119,000,000	128,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,000,000	2,000,000
Debt Securities, Available-for-sale	118,000,000	126,000,000
Debt Securities, Held-to-maturity	338,000,000	350,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4,000,000)	(6,000,000)
Debt Securities, Held-to-maturity, Fair Value	334,000,000	344,000,000
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	10,182,000,000	10,220,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	44,000,000	24,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	167,000,000	276,000,000
Debt Securities, Available-for-sale	10,059,000,000	9,968,000,000
Debt Securities, Held-to-maturity	8,743,000,000	8,560,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	16,000,000	2,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(172,000,000)	(281,000,000)
Debt Securities, Held-to-maturity, Fair Value	8,587,000,000	8,281,000,000
Municipal securities
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,539,000,000	3,512,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	17,000,000	6,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	38,000,000	78,000,000
Debt Securities, Available-for-sale	3,518,000,000	3,440,000,000
Debt Securities, Held-to-maturity	4,000,000	5,000,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	4,000,000	5,000,000
Asset-backed Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	350,000,000	318,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,000,000	1,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3,000,000	4,000,000
Debt Securities, Available-for-sale	349,000,000	315,000,000
Corporate Debt Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	51,000,000	54,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,000,000	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	1,000,000
Debt Securities, Available-for-sale	52,000,000	53,000,000
Other Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,000,000	4,000,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	4,000,000	4,000,000
Mutual Fund [Member]
Schedule of investment securities and other securities [Line Items]
Equity Securities, FV-NI, Cost	21,000,000	20,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax	0	0
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	21,000,000	20,000,000
Equity Securities [Member]
Schedule of investment securities and other securities [Line Items]
Equity Securities, FV-NI, Cost	1,000,000	1,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax	1,000,000	1,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	2,000,000	2,000,000
Investment in Federal Home Loan Bank Stock [Member] | Nonmarketable Equity Securities [Member]
Schedule of investment securities and other securities [Line Items]
Equity Securities, FV-NI, Cost	167,000,000	248,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax	0	0
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	167,000,000	248,000,000
Investment in Federal Reserve Stock [Member] | Nonmarketable Equity Securities [Member]
Schedule of investment securities and other securities [Line Items]
Equity Securities, FV-NI, Cost	296,000,000	295,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax	0	0
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	$ 296,000,000	$ 295,000,000

INVESTMENT SECURITIES AND OTH_4

INVESTMENT SECURITIES AND OTHER SECURITIES - Contractual Maturities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 258	$ 186
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	254	185
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,028	1,057
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,018	1,039
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	1,879	1,838
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	1,869	1,802
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	10,961	11,027
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	10,841	10,754
Debt Securities, Available-for-sale, Amortized Cost	14,126	14,108
Debt Securities, Available-for-sale	13,982	13,780
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	0	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	0	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	20	11
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	20	11
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	344	362
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	341	356
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	8,383	8,192
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	8,230	7,919
Debt Securities, Held-to-maturity	8,747	8,565
Debt Securities, Held-to-maturity, Fair Value	$ 8,591	$ 8,286

INVESTMENT SECURITIES AND OTH_5

INVESTMENT SECURITIES AND OTHER SECURITIES INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 676	$ 2,254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8	35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,513	9,679
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	200	324
Debt Securities, Available-for-sale, Unrealized Loss Position	10,189	11,933
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	208	359
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	6	141
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	2
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	7,079	7,711
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(172)	(279)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	7,085	7,852
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	172	281
Collateralized Mortgage Obligations [Member]
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	27	425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5,287	5,943
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	108	198
Debt Securities, Available-for-sale, Unrealized Loss Position	5,314	6,368
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	108	201
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	12
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,283	2,004
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(23)	(47)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,283	2,016
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	23	47
Residential Mortgage Backed Securities [Member]
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	259
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	537	319
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5	9
Debt Securities, Available-for-sale, Unrealized Loss Position	537	578
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	5	15
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	16
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,464	1,457
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(15)	(42)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,464	1,473
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	15	42
Commercial Mortgage Backed Securities [Member]
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,553	1,573
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	53	58
Debt Securities, Available-for-sale, Unrealized Loss Position	1,553	1,583
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	53	58
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	4,049	4,041
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(130)	(186)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	4,049	4,041
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	130	186
Other Federal Agencies [Member]
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	116	124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	2
Debt Securities, Available-for-sale, Unrealized Loss Position	116	124
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1	2
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	6	113
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	2
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	279	205
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4)	(4)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	285	318
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	4	6
US Government-sponsored Enterprises Debt Securities [Member]
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	27	694
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	7,493	7,959
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	167	267
Debt Securities, Available-for-sale, Unrealized Loss Position	7,520	8,653
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	167	276
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	6	141
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	2
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	7,075	7,707
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(172)	(279)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	7,081	7,848
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	172	281
Municipal securities
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	593	1,425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	24
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,867	1,602
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	31	54
Debt Securities, Available-for-sale, Unrealized Loss Position	2,460	3,027
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	38	78
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	4	4
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	4	4
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	0
Asset-backed Securities [Member]
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	56	95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	153	117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2	2
Debt Securities, Available-for-sale, Unrealized Loss Position	209	212
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3	4
Corporate Debt Securities [Member]
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(1)
Debt Securities, Available-for-sale, Unrealized Loss Position		41
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ (1)

INVESTMENT SECURITIES AND OTH_6

INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Pledged Financial Instruments, Not Separately Reported, Securities for Other Debt Facilities	$ 5,000,000,000	$ 4,000,000,000
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings	0
Other-than-temporary Impairment Loss, Equity Securities, Portion Recognized in Earnings	$ 0

MORTGAGE LOAN SALES AND SERVI_3

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Narrative (Details) - Residential Mortgage - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]
Servicing income	$ 15	$ 15
Unpaid principal balance of third party serviced loans	$ 21,300		$ 21,000

MORTGAGE LOAN SALES AND SERVI_4

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio (Details) - Commercial Loan [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Servicing Asset at Amortized Cost [Line Items]
Loans sold with servicing retained	$ 833	$ 843
Pretax gains resulting from above loan sales	$ 12	$ 21

MORTGAGE LOAN SALES AND SERVI_5

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Fair Value Method (Details) - Residential Mortgage - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Changes in valuation inputs or assumptions (less than)	$ 1	$ 1
Fair value, end of period:	$ 10	$ 12

MORTGAGE LOAN SALES AND SERVI_6

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method (Details) - Residential Mortgage - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Carrying value, beginning of period	$ 211	$ 191
New servicing assets created	9	10
Impairment recovery (charge)	(9)	(7)
Amortization and other	(9)	(8)
Carrying value, end of period	202	200
Fair value, end of period	$ 202	$ 205
Amortization method
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Weighted-average life (years)	6 years 1 month	7 years

MORTGAGE LOANS SALES AND SERVIC

MORTGAGE LOANS SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method Key Assumptions (Details) - Amortization method - Residential Mortgage - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]
Constant prepayment rate (annualized), actual	11.40%	9.40%
Constant prepayment rate (annualized), 10% adverse change	$ (6)	$ (6)
Constant prepayment rate (annualized), 20% adverse change	$ (12)	$ (12)
Spread over forward interest rate swap rates, actual	8.86%	9.34%
Spread over forward interest rate swap rates, 10% adverse change	$ (7)	$ (7)
Spread over forward interest rate swap rates, 20% adverse change	$ (13)	$ (13)

OPERATING LEASES - Net Operatin

OPERATING LEASES - Net Operating Lease Assets and Liabilities (Details) $ in Millions	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease assets	$ 203
Lease liabilities	$ 228

OPERATING LEASES - Lease Cost (

OPERATING LEASES - Lease Cost (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 11
Sublease income	(1)
Net lease cost	$ 10

OPERATING LEASES - Maturity of

OPERATING LEASES - Maturity of Lease Liabilities (Details) $ in Millions	Mar. 31, 2019USD ($)
Leases [Abstract]
2019	$ 36
2020	50
2021	36
2022	31
2023	26
Thereafter	93
Total lease payments	272
Less: Interest	(44)
Total	$ 228

OPERATING LEASES - Lease Cost a

OPERATING LEASES - Lease Cost and Discount Rate (Details)	Mar. 31, 2019
Leases [Abstract]
Weighted-average remaining lease term (years)	7 years 4 months 4 days
Weighted-average discount rate	4.73%

OPERATING LEASES - Supplemental

OPERATING LEASES - Supplemental Cash Flow Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 14
Right-of-use assets obtained in exchange for lease obligations	$ 1

LONG-TERM DEBT (Details)

LONG-TERM DEBT (Details) - Senior Notes - USD ($)	3 Months Ended
	Mar. 31, 2019	Jan. 29, 2019
Huntington National Bank Senior Note Due February 2021, No Coupon Rate [Member]
Debt Instrument [Line Items]
Debt face amount		$ 300,000,000
Debt percent of value	100.00%
Debt Instrument, Redemption Price, Percentage	100.00%
Huntington National Bank Senior Note Due April 2022, 3.125 Percent [Member]
Debt Instrument [Line Items]
Debt face amount		$ 500,000,000
Debt percent of value	99.909%
Debt stated interest rate		3.125%
Debt Instrument, Redemption Price, Percentage	100.00%

OTHER COMPREHENSIVE INCOME - Ac

OTHER COMPREHENSIVE INCOME - Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 1
Pretax
Other comprehensive income (loss), pretax	$ 197	(190)
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit	(43)	42
After-tax
Other comprehensive income (loss), net of tax	154	(148)
Other comprehensive income before reclassifications	150	(161)
Unrealized gains and (losses) on debt securities | Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ (1)
Pretax
Other comprehensive income (loss), before reclassifications, before tax	184	(206)
Reclassification adjustment, before tax	4	15
Tax (Expense) Benefit
Other comprehensive income (loss) before reclassifications, tax	(41)	45
Reclassification adjustment, tax	(1)	(3)
After-tax
Other comprehensive income (loss), before reclassifications, net of tax	143	(161)
Reclassification adjustment, net of tax	3	12
Other comprehensive income (loss), net of tax	146	(149)
Other comprehensive income before reclassifications	143	(161)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] | Equity Securities [Member]
After-tax
Other comprehensive income before reclassifications	7
Unrealized gains and (losses) on debt securities and Accumulated OTTI | Debt Securities
Pretax
Other comprehensive income (loss), pretax	188	(191)
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit	(42)	42
Accumulated Other Comprehensive Income (Loss), Derivative Qualifying as Hedge, Excluded Component, Including Portion Attributable to Noncontrolling Interest [Member]
Pretax
Other comprehensive income (loss), pretax	8
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit	(1)
After-tax
Other comprehensive income (loss), net of tax	7
Unrealized gains (losses) for pension and other post- retirement obligations
Pretax
Other comprehensive income (loss), pretax	1	1
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit	0	0
After-tax
Other comprehensive income (loss), net of tax	1	1
Other comprehensive income before reclassifications	$ 0	$ 0

OTHER COMPREHENSIVE INCOME OTHE

OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 11,102	$ 10,814	$ 10,814
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		1
Other comprehensive income before reclassifications	150	(161)
Amounts reclassified from accumulated OCI to earnings	4	13
Period change	154	(148)
Balance, end of period	11,432	11,308	11,102
Unrealized gains and (losses) on debt securities | Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(363)	(278)	(278)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				$ (1)
Other comprehensive income before reclassifications	143	(161)
Amounts reclassified from accumulated OCI to earnings	3	12
Period change	146	(149)
Balance, end of period	(217)	(428)	(363)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] | Equity Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	0
Other comprehensive income before reclassifications	7
Amounts reclassified from accumulated OCI to earnings	0
Period change	7
Balance, end of period	7		0
Unrealized gains (losses) for pension and other post- retirement obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(246)	(250)	(250)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated OCI to earnings	1	1
Period change	1	1
Balance, end of period	(245)	(249)	(246)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(609)	(528)	(528)
Balance, end of period	(455)	(677)	(609)
Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net unrealized loss on securities transfer	$ (134)	$ (147)	$ (137)

OTHER COMPREHENSIVE INCOME - Re

OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest income - held-to-maturity securities - taxable	$ 54	$ 54
Interest income - loans and leases	901	756
Noninterest income - other income	39	40
Noninterest expense - personnel costs	(394)	(376)
Income before income taxes	421	385
Provision for income taxes	(63)	(59)
Net income applicable to common shares	339	314
Unrealized gains and (losses) on debt securities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest income - held-to-maturity securities - taxable	(4)	(3)
Noninterest income - net gains (losses) on sale of securities	0	(12)
Unrealized gains and (losses) on debt securities and Accumulated OTTI | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(4)	(15)
Provision for income taxes	1	3
Net income applicable to common shares	(3)	(12)
Amortization of defined benefit pension and post-retirement items: actuarial gains (losses) | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Noninterest expense - personnel costs	(2)	2
Amortization of defined benefit pension and post-retirement items: Prior service credit | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Noninterest expense - personnel costs	1	(1)
Unrealized gains (losses) for pension and other post- retirement obligations | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(1)	1
Provision for income taxes	0	0
Net income applicable to common shares	$ (1)	$ 1

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic earnings per common share:
Net income	$ 358	$ 326
Preferred stock dividends	(19)	(12)
Net income available to common shareholders	$ 339	$ 314
Average common shares issued and outstanding (in shares)	1,046,995	1,083,836
Basic earnings per common share (in usd per share)	$ 0.32	$ 0.29
Dilutive potential common shares:
Stock options and restricted stock units and awards	14,807	19,858
Shares held in deferred compensation plans	3,836	3,228
Dilutive impact of Preferred Stock	0	17,856
Dilutive potential common shares	18,643	40,942
Total diluted average common shares issued and outstanding (in shares)	1,065,638	1,124,778
Diluted earnings per common share (in usd per share)	$ 0.32	$ 0.28
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options outstanding to purchase common stock shares having antidilutive effect	4,000	100

NONINTEREST INCOME - Summary of

NONINTEREST INCOME - Summary of Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Noninterest income from contracts with customers	$ 222	$ 214
Noninterest income within the scope of other GAAP topics	97	100
Total noninterest income	$ 319	$ 314

NONINTEREST INCOME - Disaggrega

NONINTEREST INCOME - Disaggregation by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	$ 222	$ 214
Noninterest income within the scope of other GAAP topics	97	100
Noninterest income	319	314
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	87	86
Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	53	49
Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	44	44
Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	21	21
Other income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	17	14
Operating Segments | Consumer & Business Banking
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	143	140
Noninterest income within the scope of other GAAP topics	31	35
Noninterest income	174	175
Operating Segments | Consumer & Business Banking | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	69	68
Operating Segments | Consumer & Business Banking | Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	50	47
Operating Segments | Consumer & Business Banking | Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	8	7
Operating Segments | Consumer & Business Banking | Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	8	8
Operating Segments | Consumer & Business Banking | Other income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	8	10
Operating Segments | Commercial Banking
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	26	20
Noninterest income within the scope of other GAAP topics	50	51
Noninterest income	76	71
Operating Segments | Commercial Banking | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	16	16
Operating Segments | Commercial Banking | Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	3	2
Operating Segments | Commercial Banking | Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	1
Operating Segments | Commercial Banking | Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	2	1
Operating Segments | Commercial Banking | Other income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	5	0
Operating Segments | Vehicle Finance
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	2	2
Noninterest income within the scope of other GAAP topics	0	1
Noninterest income	2	3
Operating Segments | Vehicle Finance | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	1
Operating Segments | Vehicle Finance | Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0
Operating Segments | Vehicle Finance | Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0
Operating Segments | Vehicle Finance | Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0
Operating Segments | Vehicle Finance | Other income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	1
Operating Segments | RBPCG
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	50	51
Noninterest income within the scope of other GAAP topics	1	0
Noninterest income	51	51
Operating Segments | RBPCG | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	1
Operating Segments | RBPCG | Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0
Operating Segments | RBPCG | Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	35	36
Operating Segments | RBPCG | Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	11	11
Operating Segments | RBPCG | Other income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	3	3
Treasury / Other
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	1
Noninterest income within the scope of other GAAP topics	15	13
Noninterest income	16	14
Treasury / Other | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0
Treasury / Other | Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0
Treasury / Other | Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	0
Treasury / Other | Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	1
Treasury / Other | Other income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	$ 0	$ 0

FAIR VALUES OF ASSETS AND LIA_3

FAIR VALUES OF ASSETS AND LIABILITIES - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 523	$ 613
Loans Receivable, Fair Value Disclosure	$ 79	$ 79

FAIR VALUES OF ASSETS AND LIA_4

FAIR VALUES OF ASSETS AND LIABILITIES - Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Assets measured at fair value on a recurring basis
Trading account securities	$ 166	$ 105
Loans Held-for-sale, Fair Value Disclosure	523	613
Consumer loans	79	79
Gross amounts of recognized assets	522	500
Derivative assets netting	(259)	(291)
Net amounts of assets presented in the condensed consolidated balance sheets	263	209
Liabilities measured at fair value on a recurring basis
Gross amounts of recognized liabilities	371	404
Gross amounts offset in the condensed consolidated balance sheets	(284)	(217)
Derivative liabilities	87	187
Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Trading account securities	166	105
Available-for-sale securities	13,982	13,780
Other securities	23	22
Loans Held-for-sale, Fair Value Disclosure	523	613
MSRs	10	10
Derivative assets netting	(259)	(291)
Net amounts of assets presented in the condensed consolidated balance sheets	263	209
Liabilities measured at fair value on a recurring basis
Gross amounts offset in the condensed consolidated balance sheets	(284)	(217)
Derivative liabilities	87	187
Fair Value, Measurements, Recurring | Municipal securities
Assets measured at fair value on a recurring basis
Trading account securities	86	28
Available-for-sale securities	3,518	3,440
Fair Value, Measurements, Recurring | Other securities
Assets measured at fair value on a recurring basis
Trading account securities	78	77
Available-for-sale securities	4	4
Fair Value, Measurements, Recurring | US Treasury Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	5	5
Fair Value, Measurements, Recurring | Federal agencies: Mortgage-backed securities
Assets measured at fair value on a recurring basis
Available-for-sale securities	7,010	6,999
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	1,373	1,255
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	1,553	1,583
Fair Value, Measurements, Recurring | Other Federal Agencies [Member]
Assets measured at fair value on a recurring basis
Trading account securities	2
Available-for-sale securities	118	126
Fair Value, Measurements, Recurring | Asset-backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	349	315
Fair Value, Measurements, Recurring | Corporate Debt Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	52	53
Fair Value, Measurements, Recurring | Level 1
Assets measured at fair value on a recurring basis
Trading account securities	77	78
Available-for-sale securities	5	5
Other securities	23	22
Loans Held-for-sale, Fair Value Disclosure	0	0
Consumer loans	0	0
MSRs	0	0
Gross amounts of recognized assets	1	21
Liabilities measured at fair value on a recurring basis
Gross amounts of recognized liabilities	8	11
Fair Value, Measurements, Recurring | Level 1 | Municipal securities
Assets measured at fair value on a recurring basis
Trading account securities	0	1
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Other securities
Assets measured at fair value on a recurring basis
Trading account securities	77	77
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 1 | US Treasury Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	5	5
Fair Value, Measurements, Recurring | Level 1 | Federal agencies: Mortgage-backed securities
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Other Federal Agencies [Member]
Assets measured at fair value on a recurring basis
Trading account securities	0
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Corporate Debt Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 2
Assets measured at fair value on a recurring basis
Trading account securities	89	27
Available-for-sale securities	10,740	10,610
Loans Held-for-sale, Fair Value Disclosure	523	613
Consumer loans	50	49
MSRs	0	0
Gross amounts of recognized assets	513	474
Liabilities measured at fair value on a recurring basis
Gross amounts of recognized liabilities	360	390
Fair Value, Measurements, Recurring | Level 2 | Municipal securities
Assets measured at fair value on a recurring basis
Trading account securities	86	27
Available-for-sale securities	281	275
Fair Value, Measurements, Recurring | Level 2 | Other securities
Assets measured at fair value on a recurring basis
Trading account securities	1	0
Available-for-sale securities	4	4
Fair Value, Measurements, Recurring | Level 2 | US Treasury Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Federal agencies: Mortgage-backed securities
Assets measured at fair value on a recurring basis
Available-for-sale securities	7,010	6,999
Fair Value, Measurements, Recurring | Level 2 | Residential Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	1,373	1,255
Fair Value, Measurements, Recurring | Level 2 | Commercial Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	1,553	1,583
Fair Value, Measurements, Recurring | Level 2 | Other Federal Agencies [Member]
Assets measured at fair value on a recurring basis
Trading account securities	2
Available-for-sale securities	118	126
Fair Value, Measurements, Recurring | Level 2 | Asset-backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	349	315
Fair Value, Measurements, Recurring | Level 2 | Corporate Debt Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	52	53
Fair Value, Measurements, Recurring | Level 3
Assets measured at fair value on a recurring basis
Trading account securities	0	0
Available-for-sale securities	3,237	3,165
Loans Held-for-sale, Fair Value Disclosure	0	0
Consumer loans	29	30
MSRs	10	10
Gross amounts of recognized assets	8	5
Liabilities measured at fair value on a recurring basis
Gross amounts of recognized liabilities	3	3
Fair Value, Measurements, Recurring | Level 3 | Municipal securities
Assets measured at fair value on a recurring basis
Trading account securities	0	0
Available-for-sale securities	3,237	3,165
Fair Value, Measurements, Recurring | Level 3 | Other securities
Assets measured at fair value on a recurring basis
Trading account securities	0	0
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 3 | US Treasury Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Federal agencies: Mortgage-backed securities
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Other Federal Agencies [Member]
Assets measured at fair value on a recurring basis
Trading account securities	0
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Corporate Debt Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	$ 0	$ 0

FAIR VALUES OF ASSETS AND LIA_5

FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Total gains/losses for the period:
Included in OCI	$ (43)
MSRs
Assets Level 3 Roll Forward:
Opening balance	10	$ 11
Transfers out of Level 3 (1)	0	0
Total gains/losses for the period:
Included in earnings	0	1
Included in OCI	0	0
Purchases/originations	0	0
Sales	0	0
Repayments	0	0
Settlements	0	0
Closing balance	10	12
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	0	1
Derivative instruments
Assets Level 3 Roll Forward:
Opening balance	2	(1)
Transfers out of Level 3 (1)	(9)	(5)
Total gains/losses for the period:
Included in earnings	(12)	(6)
Included in OCI	0	0
Purchases/originations	0	0
Sales	0	0
Repayments	0	0
Settlements	0	0
Closing balance	5	0
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	2	0
Municipal securities
Assets Level 3 Roll Forward:
Opening balance	3,165	3,167
Transfers out of Level 3 (1)	0	0
Total gains/losses for the period:
Included in earnings	1	(1)
Included in OCI	(43)	28
Purchases/originations	81	193
Sales	0	0
Repayments	0	0
Settlements	(53)	(101)
Closing balance	3,237	3,230
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	0	0
Asset-backed Securities [Member]
Assets Level 3 Roll Forward:
Opening balance		24
Transfers out of Level 3 (1)		0
Total gains/losses for the period:
Included in earnings		(2)
Included in OCI		(11)
Purchases/originations		0
Sales		(33)
Repayments		0
Settlements		0
Closing balance		0
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date		0
Automobile
Assets Level 3 Roll Forward:
Opening balance	30	38
Transfers out of Level 3 (1)	0	0
Total gains/losses for the period:
Included in earnings	0	0
Included in OCI	0	0
Purchases/originations	0	0
Sales	0	0
Repayments	(1)	(1)
Settlements	0	0
Closing balance	29	37
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	0	$ 0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	13,982		$ 13,780
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	1,553		1,583
Fair Value, Measurements, Recurring [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	1,373		1,255
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	10,740		10,610
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	1,553		1,583
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities	$ 1,373		$ 1,255

FAIR VALUES OF ASSETS AND LIA_6

FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Classification of Gains/Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 0	$ 1
Mortgage banking income	0	(1)
Securities gains (losses)	0	0
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0	1
Fair Value Assets Measured On Recurring Basis Gain Loss Included In Interest and fee income	0
Derivative Financial Instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage banking income	(12)	(6)
Securities gains (losses)	0	0
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(12)	(6)
Fair Value Assets Measured On Recurring Basis Gain Loss Included In Interest and fee income	0
Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	1	(1)
Fair Value Assets Measured On Recurring Basis Gain Loss Included In Other Expense		(1)
Mortgage banking income	0	0
Securities gains (losses)	0	0
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	1	(1)
Fair Value Assets Measured On Recurring Basis Gain Loss Included In Interest and fee income	(1)
Asset-backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(2)
Mortgage banking income		0
Securities gains (losses)		(2)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings		(2)
Automobile
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0
Mortgage banking income	0	0
Securities gains (losses)	0	0
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0	$ 0
Fair Value Assets Measured On Recurring Basis Gain Loss Included In Interest and fee income	$ 0

FAIR VALUES OF ASSETS AND LIA_7

FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 523	$ 613
Loans Receivable, Fair Value Disclosure	79	79
Fair Value, Measurements, Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Fair Value Disclosure	523	613
Fair Value, Measurements, Recurring | Mortgages Held For Sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held For Sale Unpaid Principal	506	594
Difference	(17)	(19)
Fair Value, Measurements, Recurring | Mortgages Held To Maturity
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Receivable, Fair Value Disclosure	79	79
Loans Held To Maturity Unpaid Principal	86	87
Difference	(7)	(8)
Fair Value, Measurements, Recurring | 90 or more days | Mortgages Held For Sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Loans Held For Sale Unpaid Principal	0	0
Difference	0	0
Fair Value, Measurements, Recurring | 90 or more days | Mortgages Held To Maturity
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Receivable, Fair Value Disclosure	6	6
Loans Held To Maturity Unpaid Principal	7	7
Difference	$ (1)	$ (1)

FAIR VALUES OF ASSETS AND LIA_8

FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option-Changs in Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Measurements, Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gains (losses) from fair value changes	$ (2)	$ (2)
Consumer loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gains (losses) from fair value changes	$ 0	$ 0

FAIR VALUES OF ASSETS AND LIA_9

FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		$ 166	$ 105
Loans held for sale	[1]	693	804
Long-term debt		9,400	8,625
Held-to-maturity securities		8,747	8,565
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		74,315	74,128
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		166	105
Loans held for sale		696	806
Available-for-sale securities		13,982	13,780
Long-term debt		9,610	8,718
Held-to-maturity securities		8,591	8,286
Other Securities		486	565
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		74,160	73,668
Level 1 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		77	78
Loans held for sale		0
Available-for-sale securities		5	5
Long-term debt		0	0
Held-to-maturity securities		0	0
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		0	0
Level 2 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		89	27
Loans held for sale		523	613
Available-for-sale securities		10,740	10,610
Long-term debt		9,016	8,158
Held-to-maturity securities		8,591	8,286
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		50	49
Level 3 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		0	0
Loans held for sale		173	193
Available-for-sale securities		3,237	3,165
Long-term debt		594	560
Held-to-maturity securities		0	0
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		74,110	73,619
Nonrecurring Basis
Assets measured at fair value on a nonrecurring basis
Impaired loans			(33)
Other real estate owned			$ (20)
Nonrecurring Basis | Fair Value
Assets measured at fair value on a nonrecurring basis
Impaired loans		(49)
Other real estate owned		(6)
Nonrecurring Basis | Total Gains/(Losses)
Assets measured at fair value on a nonrecurring basis
Impaired loans		0
Other real estate owned		(4)
Nonrecurring Basis | Level 1 | Fair Value
Assets measured at fair value on a nonrecurring basis
Impaired loans		0
Other real estate owned		0
Nonrecurring Basis | Level 2 | Fair Value
Assets measured at fair value on a nonrecurring basis
Impaired loans		0
Other real estate owned		0
Nonrecurring Basis | Level 3 | Fair Value
Assets measured at fair value on a nonrecurring basis
Impaired loans		(49)
Other real estate owned		$ (6)
[1]	Amounts represent loans for which Huntington has elected the fair value option.

FAIR VALUES OF ASSETS AND LI_10

FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value Disclosures [Abstract]
Gross amounts of recognized assets	$ 522	$ 500
Derivative Liability, Fair Value, Gross Liability	371	404
Consumer loans	79	79
Loans Held-for-sale, Fair Value Disclosure	523	613
Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
MSRs	10	10
Available-for-sale securities	13,982	13,780
Loans Held-for-sale, Fair Value Disclosure	523	613
Fair Value, Measurements, Nonrecurring
Fair Value Disclosures [Abstract]
Impaired loans Fair Value Disclosure		33
Accrued income and other assets Fair Value Disclosure		20
Level 3 | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
MSRs	10	10
Gross amounts of recognized assets	8	5
Derivative Liability, Fair Value, Gross Liability	3	3
Available-for-sale securities	3,237	3,165
Consumer loans	29	30
Loans Held-for-sale, Fair Value Disclosure	$ 0	$ 0
Weighted Average | Market Approach Valuation Technique | Level 3 | Derivative Financial Instruments, Liabilities [Member]
Fair Value Disclosures [Abstract]
Fair Value Inputs, Timing of the resolution of the litigation	Jun. 30, 2020
Loans held for investment [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.12	0.09
Loans held for investment [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.08	0.09
Loans held for investment [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.08	0.09
Loans held for investment [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.07	0.07
Loans held for investment [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.09	0.09
Loans held for investment [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.08	0.09
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	$ 1,373	$ 1,255
Residential Mortgage Backed Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing Asset, Measurement Input	0.27	0.54
Residential Mortgage Backed Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Option Adjusted Spread [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing Asset, Measurement Input	0.11	0.11
Residential Mortgage Backed Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing Asset, Measurement Input	0.06	0.06
Residential Mortgage Backed Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Option Adjusted Spread [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing Asset, Measurement Input	0.05	0.05
Residential Mortgage Backed Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Constant Prepayment Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing Asset, Measurement Input	0.08	0.08
Residential Mortgage Backed Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Option Adjusted Spread [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Servicing Asset, Measurement Input	0.09	0.08
Derivative Financial Instruments, Liabilities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Estimated Conversion Factor [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Derivative Liability, Measurement Input	1.63	1.630
Derivative Financial Instruments, Liabilities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Estimated Growth Rate of Visa Class A Shares [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Derivative Liability, Measurement Input	0.07	0.070
Derivative Financial Instruments, Liabilities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Derivative Liability, Measurement Input	0.03	0.040
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	$ 349	$ 315
Asset-backed Securities [Member] | Level 3 | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	0	0
Municipal securities | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	3,518	3,440
Municipal securities | Level 3 | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	3,237	3,165
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	52	53
Corporate Debt Securities [Member] | Level 3 | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	$ 0	$ 0
Corporate Debt Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0.03	0.04
Corporate Debt Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0.39	0.39
Corporate Debt Securities [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0.90	0.90
Corporate Debt Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0.03	0.04
Corporate Debt Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0	0
Corporate Debt Securities [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0.05	0.05
Corporate Debt Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0.03	0.04
Corporate Debt Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Default Rate [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0.03	0.03
Corporate Debt Securities [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Loss Severity [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Debt Securities, Available-for-sale, Measurement Input	0.24	0.25
Derivative Financial Instruments, Assets [Member] | Maximum | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Net Market Price [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative Asset, Measurement Input	0.11	0.23
Derivative Financial Instruments, Assets [Member] | Maximum | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Estimated Pull Thru [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative Asset, Measurement Input	1	1
Derivative Financial Instruments, Assets [Member] | Minimum | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Net Market Price [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative Asset, Measurement Input	(0.03)	(0.05)
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.03
Derivative Financial Instruments, Assets [Member] | Minimum | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Estimated Pull Thru [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative Asset, Measurement Input	0.02	0.01
Derivative Financial Instruments, Assets [Member] | Minimum | Market Approach Valuation Technique | Level 3 | Measurement Input, Estimated Pull Thru [Member] | Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.88
Derivative Financial Instruments, Assets [Member] | Weighted Average | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Net Market Price [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative Asset, Measurement Input		0.02
Derivative Financial Instruments, Assets [Member] | Weighted Average | Valuation Technique, Consensus Pricing Model [Member] | Level 3 | Measurement Input, Estimated Pull Thru [Member] | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative Asset, Measurement Input		0.92
Loans held for sale [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Fair Value, Measurements, Nonrecurring
Fair Value Disclosures [Abstract]
Loans Held-for-sale, Fair Value Disclosure		$ 121
Loans held for sale [Member] | Valuation Technique, Appraisal Value [Member] | Level 3 | Fair Value, Measurements, Nonrecurring
Fair Value Disclosures [Abstract]
Loans Held-for-sale, Fair Value Disclosure		$ 24
Loans held for sale [Member] | Maximum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Nonrecurring
Fair Value Disclosures [Abstract]
Loans Held-for-sale, Measurement Input		0.06
Loans held for sale [Member] | Minimum | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Nonrecurring
Fair Value Disclosures [Abstract]
Loans Held-for-sale, Measurement Input		0.05
Loans held for sale [Member] | Weighted Average | Valuation Technique, Discounted Cash Flow [Member] | Level 3 | Measurement Input, Discount Rate [Member] | Fair Value, Measurements, Nonrecurring
Fair Value Disclosures [Abstract]
Loans Held-for-sale, Measurement Input		0.05

FAIR VALUES OF ASSETS AND LI_11

FAIR VALUES OF ASSETS AND LIABILITIES - Balance Sheet Location (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Financial Assets:
Trading account securities		$ 166	$ 105
Debt Securities, Held-to-maturity		8,747	8,565
Loans held for sale	[1]	693	804
Net loans and direct financing leases		74,315	74,128
Derivatives		263	209
Financial Liabilities:
Deposits (includes $845 and $872 respectively, classified as held-for-sale)		82,155	84,774
Short-term borrowings		2,862	2,017
Long-term borrowings		9,400	8,625
Derivatives		87	187
Reported Value Measurement [Member]
Financial Assets:
Available-for-sale securities			13,780
Other Securities		486	565
Financial Liabilities:
Short-term borrowings		2,862
Long-term borrowings		9,400
Derivatives			187
Estimate of Fair Value Measurement [Member]
Financial Assets:
Cash and short term assets		1,483
Trading account securities		166	105
Available-for-sale securities		13,982	13,780
Debt Securities, Held-to-maturity		8,591	8,286
Other Securities		486	565
Loans held for sale		696	806
Other securities (1)		23	22
Net loans and direct financing leases		74,160	73,668
Financial Liabilities:
Deposits (includes $845 and $872 respectively, classified as held-for-sale)		82,130	84,731
Short-term borrowings		2,862	2,017
Long-term borrowings		9,610	8,718
Estimate of Fair Value Measurement [Member] | Level 1
Financial Assets:
Trading account securities		77	78
Available-for-sale securities		5	5
Debt Securities, Held-to-maturity		0	0
Loans held for sale		0
Other securities (1)		23	22
Net loans and direct financing leases		0	0
Financial Liabilities:
Deposits (includes $845 and $872 respectively, classified as held-for-sale)		0	0
Short-term borrowings		2	1
Long-term borrowings		0	0
Estimate of Fair Value Measurement [Member] | Level 2
Financial Assets:
Trading account securities		89	27
Available-for-sale securities		10,740	10,610
Debt Securities, Held-to-maturity		8,591	8,286
Loans held for sale		523	613
Other securities (1)		0	0
Net loans and direct financing leases		50	49
Financial Liabilities:
Deposits (includes $845 and $872 respectively, classified as held-for-sale)		74,859	76,922
Short-term borrowings		0	0
Long-term borrowings		9,016	8,158
Estimate of Fair Value Measurement [Member] | Level 3
Financial Assets:
Trading account securities		0	0
Available-for-sale securities		3,237	3,165
Debt Securities, Held-to-maturity		0	0
Loans held for sale		173	193
Other securities (1)		0	0
Net loans and direct financing leases		74,110	73,619
Financial Liabilities:
Deposits (includes $845 and $872 respectively, classified as held-for-sale)		7,271	7,809
Short-term borrowings		2,860	2,016
Long-term borrowings		594	560
Fair Value, Measurements, Recurring [Member]
Financial Assets:
Trading account securities		166	105
Available-for-sale securities		13,982	13,780
Derivatives		263	209
Financial Liabilities:
Derivatives		87	187
Fair Value, Measurements, Recurring [Member] | Level 1
Financial Assets:
Trading account securities		77	78
Available-for-sale securities		5	5
Fair Value, Measurements, Recurring [Member] | Level 2
Financial Assets:
Trading account securities		89	27
Available-for-sale securities		10,740	10,610
Fair Value, Measurements, Recurring [Member] | Level 3
Financial Assets:
Trading account securities		0	0
Available-for-sale securities		3,237	3,165
Other securities | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Trading account securities		78	77
Available-for-sale securities		4	4
Other securities | Fair Value, Measurements, Recurring [Member] | Level 1
Financial Assets:
Trading account securities		77	77
Available-for-sale securities		0	0
Other securities | Fair Value, Measurements, Recurring [Member] | Level 2
Financial Assets:
Trading account securities		1	0
Available-for-sale securities		4	4
Other securities | Fair Value, Measurements, Recurring [Member] | Level 3
Financial Assets:
Trading account securities		0	0
Available-for-sale securities		0	0
Amortized Cost [Member] | Reported Value Measurement [Member]
Financial Assets:
Cash and short term assets		1,483	2,725
Debt Securities, Held-to-maturity		8,747	8,565
Other Securities		463	543
Financial Liabilities:
Deposits (includes $845 and $872 respectively, classified as held-for-sale)		82,155	84,774
Short-term borrowings		2,862	2,017
Long-term borrowings		9,400	8,625
Fair Value Fair Value Option [Member] | Reported Value Measurement [Member]
Financial Assets:
Trading account securities		166	105
Available-for-sale securities		13,982	13,780
Other Securities		23	22
Loans held for sale		523	613
Derivatives		263	209
Financial Liabilities:
Derivatives		87	187
LowerOfCostOrMarket [Member] | Reported Value Measurement [Member]
Financial Assets:
Loans held for sale		$ 170	$ 191
[1]	Amounts represent loans for which Huntington has elected the fair value option.

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)group	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Derivative [Line Items]
Purchase of interest rate caps and derivative financial instruments, notional value	$ 9,552	$ 4,877	$ 4,877
Increase (decrease) to net interest income due to derivative adjustment	(14)	1
Fair value hedging adjustments	(119)		(127)
Credit risks from interest rate swaps used for trading purposes	237	132	132
Derivative Liability	$ 87	187	187
Number of primary groups | group	2
Aggregate credit risk, net of collateral	$ 21	37	37
Investment securities and cash collateral pledged by Huntington	80
Investment securities and cash collateral pledged to Huntington	76
Swap
Derivative [Line Items]
Derivative Liability	3
Derivative used in trading activity
Derivative [Line Items]
Net derivative asset (liability)	82	92	92
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value	28,000	26,000	26,000
Derivative used in Mortgage Banking Activities
Derivative [Line Items]
Purchase of interest rate caps and derivative financial instruments, notional value	650	0	0
Derivative, Fair Value, Net		(4)	(4)
Fair Value Hedging
Derivative [Line Items]
Purchase of interest rate caps and derivative financial instruments, notional value	5,790	4,865	4,865
Cash Flow Hedging
Derivative [Line Items]
Purchase of interest rate caps and derivative financial instruments, notional value	2,762	12	12
Commitments to Sell Loans [Member]
Derivative [Line Items]
Commitments to sell residential real estate loans	$ 900	$ 800	$ 800

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS - Hedging Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Asset derivatives included in accrued income and other assets
Total contracts	$ 522	$ 500
Liability derivatives included in accrued expenses and other liabilities
Total contracts	371	404
Accrued income and other assets
Asset derivatives included in accrued income and other assets
Interest rate contracts designated as hedging instruments	95	44
Interest rate contracts not designated as hedging instruments	276	261
Foreign exchange contracts not designated as hedging instruments	18	23
Commodities contracts not designated as hedging instruments	133	172
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0
Total contracts	522	500
Accrued expenses and other liabilities
Liability derivatives included in accrued expenses and other liabilities
Interest rate contracts designated as hedging instruments	30	42
Interest rate contracts not designated as hedging instruments	188	165
Foreign exchange contracts not designated as hedging instruments	16	19
Commodities contracts not designated as hedging instruments	131	168
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	6	10
Total contracts	$ 371	$ 404

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS - Gain (Loss) (Details) - Not Designated as Hedging Instrument [Member] - Fair Value Hedging - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 23	$ 6
Interest Rate Contract [Member] | Capital markets fees [Domain]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	10	7
Interest Rate Contract [Member] | Mortgage Banking Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	12	(8)
Foreign Exchange Contract [Member] | Capital markets fees [Domain]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	8	6
Commodity Contract [Member] | Capital markets fees [Domain]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(6)	2
Equity Contract [Member] | Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (1)	$ (1)

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Notional Disclosures [Abstract]
Derivative, Notional Amount	$ 9,552,000	$ 4,877,000
Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	5,790,000	4,865,000
Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	2,762,000	12,000
Economic Hedging [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	1,000,000
Loan
Notional Disclosures [Abstract]
Derivative, Notional Amount	2,750,000
Loan | Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	0
Loan | Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	2,750,000
Loan | Economic Hedging [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	0
Securities Investment [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	12,000	12,000
Securities Investment [Member] | Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	0	0
Securities Investment [Member] | Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	12,000	12,000
Securities Investment [Member] | Economic Hedging [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	0
Other long-term debt
Notional Disclosures [Abstract]
Derivative, Notional Amount	5,790,000	4,865,000
Other long-term debt | Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	5,790,000	4,865,000
Other long-term debt | Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	0	0
Other long-term debt | Economic Hedging [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	0
Unassigned [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	1,000,000
Unassigned [Member] | Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	0
Unassigned [Member] | Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	0
Unassigned [Member] | Economic Hedging [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	1,000,000
Asset conversion swaps Receive Fixed Generic
Notional Disclosures [Abstract]
Derivative, Notional Amount	12,000	12,000
Liability conversion swaps Receive Fixed Generic
Notional Disclosures [Abstract]
Derivative, Notional Amount	5,790,000	$ 4,865,000
Interest Rate Floor [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	$ 3,750,000

DERIVATIVE FINANCIAL INSTRUME_7

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Managemen Add Info (Details Add Info) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Notional Amount	$ 9,552,000	$ 4,877,000
Derivative, Average Remaining Maturity	2 years 6 months 10 days
Asset conversion swaps - Receive Fixed - Generic
Derivative [Line Items]
Derivative, Notional Amount	$ 12,000	$ 12,000
Derivative, Average Remaining Maturity	11 months 20 days	1 year 2 months
Fair Value	$ 0	$ (51)
Weighted-Average Rate Receive	2.20%	2.20%
Weighted-Average Rate Pay	2.48%	2.46%
Liability conversion swaps - Receive Fixed - Generic
Derivative [Line Items]
Derivative, Notional Amount	$ 5,790,000	$ 4,865,000
Derivative, Average Remaining Maturity	2 years 6 months 10 days	2 years 7 months
Fair Value	$ 53,000	$ 2,000
Weighted-Average Rate Receive	2.24%	2.24%
Weighted-Average Rate Pay	2.54%	2.54%
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 5,802,000	$ 4,877,000
Fair Value	$ 53,000	$ 2,000
Weighted-Average Rate Receive	2.24%	2.24%
Weighted-Average Rate Pay	2.54%	2.54%
Interest Rate Floor [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 3,750,000
Derivative, Average Remaining Maturity	1 year 9 months 27 days
Fair Value	$ 12,000

DERIVATIVE FINANCIAL INSTRUME_8

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Hedge Liabilities	$ 6,498	$ 4,845
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	29	(12)
Interest expense subordinated notes and other long term debt [Member] | Subordinated notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	41	(68)
Interest expense subordinated notes and other long term debt [Member] | Hedged Subordinated notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	$ (41)	$ 71

DERIVATIVE FINANCIAL INSTRUME_9

DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
MSR Derivative Hedging [Table Text Block]	The notional value of the derivative financial instruments, corresponding trading assets and liabilities, and net trading gains (losses) related to MSR hedging activity is summarized in the following table: (dollar amounts in millions) March 31, 2019 December 31, 2018 Notional Value $ 650 $ — Trading Assets 4 — Trading Liabilities 1 — Three months ended March 31, (dollar amounts in millions) 2019 2018 Trading gains (losses) $ 7 $ —
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 9,552		$ 4,877
Derivative used in Mortgage Banking Activities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	650		0
Trading Assets	4		0
Trading Liabilities	1		$ 0
Derivative, Gain (Loss) on Derivative, Net	$ 7	$ 0

DERIVATIVE FINANCIAL INSTRUM_10

DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	$ 522	$ 500
Gross amounts offset in the condensed consolidated balance sheets	259	291
Net amounts of assets presented in the condensed consolidated balance sheets	263	209
Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments	(4)	(4)
Gross amounts not offset in the condensed consolidated balance sheets, cash collateral received	(21)	(53)
Net amount	$ 238	$ 152

DERIVATIVE FINANCIAL INSTRUM_11

DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	$ 371	$ 404
Gross amounts offset in the condensed consolidated balance sheets	(284)	(217)
Derivative liabilities	87	187
Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments	0	0
Gross amounts not offset in the condensed consolidated balance sheets, Cash collateral received	(15)	(12)
Net amount	$ 72	$ 175

VIEs - Narrative (Details)

VIEs - Narrative (Details)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Maximum year to defer payment of interest on Debenture	5 years

VIEs - Unconsolidated VIEs (Det

VIEs - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Trust Preferred Securities
Variable Interest Entity [Line Items]
Total Assets	$ 14	$ 14
Total Liabilities	252	252
Maximum Exposure to Loss	0	0
Affordable Housing Tax Credit Partnerships
Variable Interest Entity [Line Items]
Total Assets	685	708
Total Liabilities	314	357
Maximum Exposure to Loss	685	708
Other Investments
Variable Interest Entity [Line Items]
Total Assets	150	126
Total Liabilities	59	53
Maximum Exposure to Loss	150	126
Total
Variable Interest Entity [Line Items]
Total Assets	849	848
Total Liabilities	625	662
Maximum Exposure to Loss	$ 835	$ 834

VIEs - Trust preferred Securiti

VIEs - Trust preferred Securities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Summary of Outstanding Trust Preferred Securities
Principal amount of subordinated note/ debenture issued to trust	$ 252
Investment in unconsolidated subsidiary	$ 14
Huntington Capital I
Summary of Outstanding Trust Preferred Securities
Interest rate on Trust Preferred Securities	3.29%
Principal amount of subordinated note/ debenture issued to trust	$ 70
Investment in unconsolidated subsidiary	$ 6
Huntington Capital I | London Interbank Offered Rate (LIBOR)
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]
Rate spread over three month LIBOR	0.70%
Huntington Capital II
Summary of Outstanding Trust Preferred Securities
Interest rate on Trust Preferred Securities	3.22%
Principal amount of subordinated note/ debenture issued to trust	$ 32
Investment in unconsolidated subsidiary	$ 3
Huntington Capital II | London Interbank Offered Rate (LIBOR)
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]
Rate spread over three month LIBOR	0.625%
Sky Financial Capital Trust III
Summary of Outstanding Trust Preferred Securities
Interest rate on Trust Preferred Securities	3.99%
Principal amount of subordinated note/ debenture issued to trust	$ 72
Investment in unconsolidated subsidiary	$ 2
Sky Financial Capital Trust III | London Interbank Offered Rate (LIBOR)
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]
Rate spread over three month LIBOR	1.40%
Sky Financial Capital Trust IV
Summary of Outstanding Trust Preferred Securities
Interest rate on Trust Preferred Securities	3.99%
Principal amount of subordinated note/ debenture issued to trust	$ 74
Investment in unconsolidated subsidiary	$ 2
Camco Financial Trust
Summary of Outstanding Trust Preferred Securities
Interest rate on Trust Preferred Securities	3.92%
Principal amount of subordinated note/ debenture issued to trust	$ 4
Investment in unconsolidated subsidiary	$ 1
Camco Financial Trust | London Interbank Offered Rate (LIBOR)
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]
Rate spread over three month LIBOR	1.33%

VIEs - Low Income Housing Tax C

VIEs - Low Income Housing Tax Credit Partnership (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Low Income Housing Tax Credit Partnerships
Variable Interest Entity [Line Items]
Affordable housing tax credit investments	$ 1,146		$ 1,147
Less: amortization	(461)		(439)
Net affordable housing tax credit investments	685		708
Unfunded commitments	314		$ 357
Tax credits and other tax benefits recognized	27	$ 23
Proportional Amortization Method
Variable Interest Entity [Line Items]
Tax credit amortization expense included in provision for income taxes	$ 22	$ 19

COMMITMENTS AND CONTINGENT LI_3

COMMITMENTS AND CONTINGENT LIABILITIES - Commitments to Extend Credit (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Commercial
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	$ 17,377	$ 17,149
Consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	15,129	14,974
Commercial Real Estate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	1,302	1,188
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	644	676
Commercial | Commercial letters-of-credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	$ 9	$ 14

COMMITMENTS AND CONTINGENT LI_4

COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Maturity period of majority of standby letters of credit	P2Y
Maturity period of Commercial letters of credit	P90D
Standby letters of credit
Loss Contingencies [Line Items]
Carrying amount of deferred revenue associated with guarantees	$ 14,000,000	$ 13,000,000
Outstanding standby letters of credit	644,000,000	$ 676,000,000
Maximum
Loss Contingencies [Line Items]
Aggregate range of reasonably possible losses current legal proceedings	25,000,000
Minimum
Loss Contingencies [Line Items]
Aggregate range of reasonably possible losses current legal proceedings	$ 0

SEGMENT REPORTING (Details)

SEGMENT REPORTING (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)reporting_unitsegments	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of reporting segments | segments	4
Maximum business banking customer's revenue	$ 20
Net interest income	822	$ 770
Provision (reduction in allowance) for credit losses	(67)	(66)
Noninterest income	319	314
Noninterest expense	653	633
Provision (benefit) for income taxes	63	59
Net income	358	326
Assets	108,203		$ 108,781
Deposits (includes $845 and $872 respectively, classified as held-for-sale)	$ 82,155		84,774
Operating Segments
Segment Reporting Information [Line Items]
Number of reporting units | reporting_unit	6
Operating Segments | Consumer & Business Banking
Segment Reporting Information [Line Items]
Net interest income	$ 443	446
Provision (reduction in allowance) for credit losses	(17)	(32)
Noninterest income	174	175
Noninterest expense	401	412
Provision (benefit) for income taxes	42	37
Net income	157	140
Assets	25,334		27,486
Deposits (includes $845 and $872 respectively, classified as held-for-sale)	52,354		50,300
Operating Segments | Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	264	276
Provision (reduction in allowance) for credit losses	(43)	(21)
Noninterest income	76	71
Noninterest expense	142	118
Provision (benefit) for income taxes	32	44
Net income	123	164
Assets	33,749		34,818
Deposits (includes $845 and $872 respectively, classified as held-for-sale)	20,543		23,185
Operating Segments | Vehicle Finance [Member]
Segment Reporting Information [Line Items]
Net interest income	94	99
Provision (reduction in allowance) for credit losses	(9)	(14)
Noninterest income	2	3
Noninterest expense	38	34
Provision (benefit) for income taxes	10	11
Net income	39	43
Assets	19,263		19,435
Deposits (includes $845 and $872 respectively, classified as held-for-sale)	327		346
Operating Segments | RBPCG
Segment Reporting Information [Line Items]
Net interest income	50	57
Provision (reduction in allowance) for credit losses	2	1
Noninterest income	51	51
Noninterest expense	64	57
Provision (benefit) for income taxes	8	11
Net income	31	41
Assets	6,259		6,540
Deposits (includes $845 and $872 respectively, classified as held-for-sale)	5,959		6,809
Treasury / Other
Segment Reporting Information [Line Items]
Net interest income	(29)	(108)
Provision (reduction in allowance) for credit losses	0	0
Noninterest income	16	14
Noninterest expense	8	12
Provision (benefit) for income taxes	(29)	(44)
Net income	8	$ (62)
Assets	23,598		20,502
Deposits (includes $845 and $872 respectively, classified as held-for-sale)	$ 2,972		$ 4,134