Huntington Bancshares (HBAN) 10-Q31 Jul 202020 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page	6 Months Ended
Cover Page	Jun. 30, 2020shares
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity Registrant Name	HUNTINGTON BANCSHARES INC/MD
Entity Incorporation, State or Country Code	MD
Entity File Number	1-34073
Entity Tax Identification Number	31-0724920
Entity Address, Address Line One	41 South High Street
Entity Address, City or Town	Columbus
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43287
City Area Code	614
Local Phone Number	480-2265
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	1,017,309,583
Entity Central Index Key	0000049196
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Common Stock-Par Value $0.01 per share
Entity Information [Line Items]
Title of 12(b) Security	Common Stock—Par Value $0.01 per Share
Trading Symbol	HBAN
Security Exchange Name	NASDAQ
5.875% Series C Non-Cumulative, perpetual preferred stock
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares (each representing a 1/40th interest in a share of 5.875% Series C Non-Cumulative, perpetual preferred stock)
Trading Symbol	HBANN
Security Exchange Name	NASDAQ
6.250% Series D Non-Cumulative, perpetual preferred stock
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares (each representing a 1/40th interest in a share of 6.250% Series D Non-Cumulative, perpetual preferred stock)
Trading Symbol	HBANO
Security Exchange Name	NASDAQ

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Assets
Cash and due from banks		$ 1,285	$ 1,045
Interest-bearing deposits at Federal Reserve Bank		5,008	125
Interest-bearing deposits in banks		82	102
Trading account securities		45	99
Available-for-sale securities		13,297	14,149
Held-to-maturity securities		9,416	9,070
Other securities		438	441
Loans held for sale (includes $954 and $781 respectively, measured at fair value)	[1]	1,165	877
Loans and leases (includes $79 and $81 respectively, measured at fair value)	[1]	80,139	75,404
Allowance for loan and lease losses		(1,702)	(783)
Net loans and leases		78,437	74,621
Bank owned life insurance		2,560	2,542
Premises and equipment		751	763
Goodwill		1,990	1,990
Servicing rights and other intangible assets		411	475
Other assets		3,540	2,703
Total assets		118,425	109,002
Liabilities
Deposits		93,691	82,347
Short-term borrowings		146	2,606
Long-term debt		9,753	9,849
Other liabilities		2,521	2,405
Total liabilities		106,111	97,207
Shareholders’ equity
Preferred stock		1,697	1,203
Common stock		10	10
Capital surplus		8,743	8,806
Less treasury shares, at cost		(59)	(56)
Accumulated other comprehensive gain (loss)		290	(256)
Retained earnings		1,633	2,088
Total shareholders’ equity		12,314	11,795
Total liabilities and shareholders’ equity		$ 118,425	$ 109,002
Common shares authorized (par value of $0.01) (in shares)		1,500,000,000	1,500,000,000
Common shares outstanding (in shares)		1,017,309,583	1,020,003,482
Treasury shares outstanding (in shares)		4,999,371	4,537,605
Preferred stock, authorized shares (in shares)		6,617,808	6,617,808
Preferred shares outstanding (in shares)		745,500	740,500

[1]	(1) Amounts represent loans for which Huntington has elected the fair value option. See Note 12 “ Fair Values of Assets and Liabilities ”.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets
Loans held for sale, fair value	$ 954	$ 781
Loans Receivable, Fair Value Disclosure	$ 92	$ 81
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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest and fee income:
Loans and leases	$ 754	$ 903	$ 1,563	$ 1,804
Available-for-sale securities
Taxable	64	72	141	148
Tax-exempt	15	21	33	43
Held-to-maturity securities—taxable	59	56	117	110
Other securities—taxable	1	4	3	10
Other	9	12	20	23
Total interest income	902	1,068	1,877	2,138
Interest expense:
Deposits	46	150	151	295
Short-term borrowings	1	19	13	33
Long-term debt	63	87	131	176
Total interest expense	110	256	295	504
Net interest income	792	812	1,582	1,634
Provision for credit losses	327	59	768	126
Net interest income after provision for credit losses	465	753	814	1,508
Service charges on deposit accounts	60	92	148	179
Card and payment processing income	59	63	117	119
Trust and investment management services	96	34	92	87
Mortgage banking income	45	43	154	55
Capital markets fees	25	23	64	56
Insurance income	31	34	48	44
Bank Owned Life Insurance Income	17	15	32	31
Gain (Loss) on Sales of Loans, Net	8	13	17	26
Net (losses) gains on sales of securities	(1)	(2)	(1)	(2)
Noninterest Income, Other Operating Income	51	59	81	98
Total noninterest income	391	374	752	693
Personnel costs	418	428	814	822
Outside data processing and other services	90	89	175	170
Equipment	46	40	87	80
Net occupancy	39	38	79	80
Professional services	5	11	22	24
Amortization of intangibles	10	12	21	25
Marketing	11	12	14	18
Deposit and other insurance expense	9	8	18	16
Other noninterest expense	47	62	97	118
Total noninterest expense	675	700	1,327	1,353
Income before income taxes	181	427	239	848
Provision for income taxes	31	63	41	126
Net income	150	364	198	722
Dividends on preferred shares	19	18	37	37
Net income applicable to common shares	$ 131	$ 346	$ 161	$ 685
Average common shares—basic (in shares)	1,016,259	1,044,802	1,016,951	1,045,899
Average common shares—diluted (in shares)	1,028,683	1,060,280	1,031,629	1,062,959
Per common share:
Net income—basic (in usd per share)	$ 0.13	$ 0.33	$ 0.16	$ 0.66
Net income—diluted (in usd per share)	$ 0.13	$ 0.33	$ 0.16	$ 0.64

Condensed Consolidated Statem_2

Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 150	$ 364	$ 198	$ 722
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	(62)	(134)	(235)	(280)
Change in fair value related to cash flow hedges, net of reclassification to earnings	11	47
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax			319	54
Change in accumulated unrealized gains (losses) for pension and other post-retirement obligations	(10)	1	(8)	2
Other comprehensive income, net of tax	63	182	546	336
Comprehensive income	$ 213	$ 546	$ 744	$ 1,058

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Preferred Stock	Common Stock	Capital Surplus	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings (Deficit)	Series F Preferred Stock	Series B Preferred Stock	Series B Preferred StockRetained Earnings (Deficit)	Series C Preferred Stock	Series C Preferred StockRetained Earnings (Deficit)	Series D Preferred Stock	Series D Preferred StockRetained Earnings (Deficit)	Series E Preferred Stock	Series E Preferred StockRetained Earnings (Deficit)
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	$ 1,203	$ 11	$ 9,181	$ (45)	$ (609)	$ 1,361
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	722						722
Other comprehensive income (loss), net of tax	336					336
Cash dividends declared:
Common stock, dividend	(297)						(297)
Preferred stock, dividend									$ (1)	$ (1)	$ (3)	$ (3)	$ (19)	$ (19)	$ (14)	$ (14)
Repurchases of common stock (in shares)			(13,177)
Repurchases of common stock	(177)		$ (1)	(176)
Recognition of the fair value of share-based compensation	48			48
Other share-based compensation activity (in shares)			4,733
Other share-based compensation activity	(23)		$ 0	(23)			0
Other (in shares)					482
Other	(6)			0	$ (7)		1
Balance, end of period (in shares) at Jun. 30, 2019			1,042,140		(4,299)
Balance, end of period at Jun. 30, 2019	11,668	1,203	$ 10	9,030	$ (52)	(273)	1,750
Balance, beginning of period (in shares) at Mar. 31, 2019			1,050,253		(3,813)
Balance, beginning of period at Mar. 31, 2019	11,432	1,203	$ 11	9,167	$ (45)	(455)	1,551
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	364						364
Other comprehensive income (loss), net of tax	182					182
Cash dividends declared:
Common stock, dividend	(148)						(148)
Preferred stock, dividend									0	0	(1)	(1)	(10)	(10)	(7)	(7)
Repurchases of common stock (in shares)			(11,344)
Repurchases of common stock	(152)		$ (1)	(151)
Recognition of the fair value of share-based compensation	31			31
Other share-based compensation activity (in shares)			3,231
Other share-based compensation activity	(17)		$ 0	(17)			0
Other (in shares)					(486)
Other	(6)				$ (7)		1
Balance, end of period (in shares) at Jun. 30, 2019			1,042,140		(4,299)
Balance, end of period at Jun. 30, 2019	11,668	1,203	$ 10	9,030	$ (52)	(273)	1,750
Balance, beginning of period (in shares) at Dec. 31, 2019			1,024,541		(4,537)
Balance, beginning of period at Dec. 31, 2019	11,795	1,203	$ 10	8,806	$ (56)	(256)	2,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	198						198
Other comprehensive income (loss), net of tax	546					546
Stock Issued During Period, Value, New Issues	494							$ 494
Cash dividends declared:
Common stock, dividend	(310)						(310)
Preferred stock, dividend									(1)	(1)	(3)	(3)	(19)	(19)	(14)	(14)
Repurchases of common stock (in shares)			(7,088)
Repurchases of common stock	(88)		$ 0	(88)
Recognition of the fair value of share-based compensation	40			40
Other share-based compensation activity (in shares)			4,856
Other share-based compensation activity	(15)		$ 0	(15)
Other (in shares)					(462)
Other	(3)			0	$ (3)		0
Balance, end of period (in shares) at Jun. 30, 2020			1,022,309		(4,999)
Balance, end of period at Jun. 30, 2020	12,314	1,697	$ 10	8,743	$ (59)	290	1,633
Balance, beginning of period (in shares) at Mar. 31, 2020			1,018,752		(4,534)
Balance, beginning of period at Mar. 31, 2020	11,769	1,203	$ 10	8,728	$ (56)	227	1,657
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	150						150
Other comprehensive income (loss), net of tax	63					63
Stock Issued During Period, Value, New Issues	494							$ 494
Cash dividends declared:
Common stock, dividend	(155)						(155)
Preferred stock, dividend									$ 0	$ 0	$ (2)	$ (2)	$ (10)	$ (10)	$ (7)	$ (7)
Repurchases of common stock (in shares)			0
Repurchases of common stock	0		$ 0	0
Recognition of the fair value of share-based compensation	25			25
Other share-based compensation activity (in shares)			3,557
Other share-based compensation activity	(10)		$ 0	(10)
Other (in shares)					(465)
Other	(3)				$ (3)
Balance, end of period (in shares) at Jun. 30, 2020			1,022,309		(4,999)
Balance, end of period at Jun. 30, 2020	12,314	$ 1,697	$ 10	$ 8,743	$ (59)	$ 290	1,633
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	0						$ (306)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax	$ (306)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash dividends declared:
Common stock, Cash dividend per share (in usd per share)	$ 0.15	$ 0.14	$ 0.3	$ 0.28
Series B Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	9.8	13.24	21.13	26.96
Series C Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	14.69	14.69	29.38	29.38
Series D Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	15.63	15.63	31.25	31.25
Series E Preferred Stock
Cash dividends declared:
Preferred stock dividend per share (in usd per share)	$ 1,425	$ 1,425	$ 2,850	$ 2,850

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities
Net income	$ 198	$ 722
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	768	126
Depreciation and amortization	178	204
Share-based compensation expense	40	48
Deferred income tax (benefit) expense	(66)	29
Net change in:
Trading account securities	54	(71)
Loans held for sale	(181)	(97)
Other assets	(1,032)	(464)
Other liabilities	755	362
Other, net	(4)	(7)
Net cash provided by (used in) operating activities	710	852
Investing activities
Change in interest bearing deposits in banks	(27)	(137)
Proceeds from:
Maturities and calls of available-for-sale securities	1,947	768
Maturities and calls of held-to-maturity securities	1,173	380
Maturities and calls of other securities	65	127
Sales of available-for-sale securities	390	1,546
Purchases of available-for-sale securities	(2,744)	(1,890)
Purchases of held-to-maturity securities	0	(516)
Purchases of other securities	(62)	(2)
Net proceeds from sales of portfolio loans	416	430
Principal payments received under direct finance and sales-type leases	346	340
Net loan and lease activity, excluding sales and purchases	(5,443)	(807)
Purchases of premises and equipment	(49)	(51)
Purchases of loans and leases	(402)	(241)
Net cash paid for branch disposition	0	(555)
Other, net	21	29
Net cash provided by (used in) investing activities	(4,369)	(579)
Financing activities
Increase (decrease) in deposits	11,344	(3,167)
(Decrease) increase in short-term borrowings	2,293	(2,157)
Net proceeds from issuance of long-term debt	1,321	857
Maturity/redemption of long-term debt	(1,634)	(661)
Dividends paid on preferred stock	(37)	(37)
Dividends paid on common stock	(307)	(295)
Repurchases of common stock	(88)	(177)
Net proceeds from issuance of preferred stock	494	0
Payments related to tax-withholding for share based compensation awards	(19)	(26)
Other, net	1	2
Net cash provided by (used for) financing activities	8,782	(1,347)
Increase (decrease) in cash and cash equivalents	5,123	(1,074)
Cash and cash equivalents at beginning of period	1,170	2,672
Cash and cash equivalents at end of period	6,293	1,598
Supplemental disclosures:
Interest paid	297	508
Income taxes paid (refunded)	10	(19)
Non-cash activities
Loans transferred to held-for-sale from portfolio	589	457
Loans transferred to portfolio from held-for-sale	23	8
Transfer of loans to OREO	5	10
Transfer of securities from held-to-maturity to available-for-sale	$ (1,520)	$ 0

BASIS OF PRESENTATION

BASIS OF PRESENTATION	6 Months Ended
BASIS OF PRESENTATION	Jun. 30, 2020
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 2019 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.

ACCOUNTING STANDARDS UPDATE

ACCOUNTING STANDARDS UPDATE	6 Months Ended
ACCOUNTING STANDARDS UPDATE	Jun. 30, 2020
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 2016-13 - 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 framework with an expected credit loss model. - Requires those financial assets subject to the new guidance 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 collectability of the reported amount. - The guidance will require additional quantitative and qualitative disclosures related to the credit risk inherent in Huntington’s portfolio and how management monitors the portfolio’s credit quality. - Management adopted the guidance on January 1, 2020 through a cumulative-effect adjustment to retained earnings and implemented changes to relevant systems, processes, and controls where necessary. - The adoption of ASU 2016-13 on January 1, 2020 resulted in an increase to our total ACL of $393 million. This represented an increase of 44% from the 2019 year end ACL level of $887 million. For more detail on the day 1 adoption impacts, please refer to Note 5 - Allowance for Credit Losses. - The ASU eliminated 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 did not have any loans accounted for as PCD upon adoption. - At adoption, Huntington did not record an allowance with respect to HTM securities as the portfolio consists almost entirely of agency-backed securities that inherently have minimal nonpayment risk. ASU 2019-04 - Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments Issued: April 2019 - Clarifies various implementation issues related to Recognition and Measurement of Financial Instruments (ASC Topic 825), Current Expected Credit Losses (ASC Topic 326) and Derivatives and Hedging (ASC Topic 815). - Provides additional implementation guidance on CECL issues that include, among others, (a) measurement of credit allowance on accrued interest; (b) treatment of credit allowance upon transfers between classifications or categories for loans and debt securities; (c) inclusion of recoveries in determining credit allowance amounts; (d) using projections of rate change for variable rate instruments; (e) vintage disclosures for lines-of-credit; (f) contractual extensions and renewals; (g) consideration of prepayments in calculating effective interest rate; and (h) consideration of costs to sell if the entity intends to sell the collateral when foreclosure is probable. - Clarifies for Topic 815, among others, that (a) only interest rate risk may be hedged in a partial-term fair value hedge; (b) amortization of fair value basis adjustment may begin before the fair value hedge is discontinued; (c) hedged AFS securities should be disclosed at amortized cost for disclosures related to hedged assets; and (d) contractually specified interest rate should be considered when applying hypothetical derivative method while assessing hedge effectiveness. - Clarifies among others, that (a) using observable price under measurement alternative provided by ASC Topic 321 is a non-recurring fair value measurement and entities should adhere to non-recurring fair value disclosure requirements of Topic 820; and (b) equity securities without readily determinable fair value accounted for under measurement alternative should be remeasured using historical exchange rates. - Management adopted the amendments on January 1, 2020. - The ASU did not have a material impact on Huntington’s Unaudited Condensed Consolidated Financial Statements. Standard Summary of guidance Effects on financial statements ASU 2019-05 - Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief Issued: May 2019 - Provides entities that have certain instruments within the scope of ASC Subtopic 326-20 with an option to irrevocably elect fair value option, applied on instrument-by-instrument basis. The fair value option does not apply to held-to-maturity debt securities. - Management did not elect this option on any eligible instruments when adopting Topic 326 on January 1, 2020. - The ASU did not impact Huntington’s Unaudited Condensed Consolidated Financial Statements. ASU 2019-08 - Compensation - Codification Improvements - Share-based Consideration Payable to a Customer Issued: November 2019 - The ASU requires that an entity measure and classify share-based payment awards granted to a customer by applying the guidance in Topic 718. - The amount of share-based payment awards should be recorded as a reduction of the transaction price and is required to be measured on the basis of grant-date fair value of the share-based payment awards in accordance with Topic 718. - The classification and subsequent measurement of the award are subject to the guidance in Topic 718 unless the share-based payment award is subsequently modified and the grantee is no longer a customer. - Management adopted the amendments on January 1, 2020. - The ASU did not have a material impact on Huntington’s Unaudited Condensed Consolidated Financial Statements. ASU 2019-11 - Financial Instruments - Credit Losses (Topic 326): Codification Improvements to Topic 326 Issued: November 2019 - The ASU clarifies or addresses stakeholders’ specific issues related to ASU 2016-13 as described below: - Clarifies that the allowance for purchased financial assets with credit deterioration should include expected recoveries. If a method other than a discounted cash flow method is used to calculate allowance, expected recoveries should not result in an acceleration of the noncredit discount. - Provides transition relief by permitting entities an accounting policy election to adjust the effective interest rate on existing TDRs using prepayment assumptions on the date of adoption of Topic 326 rather than the prepayment assumptions in effect immediately before the restructuring. - Extends the disclosure relief for accrued interest receivable balances to additional relevant disclosures involving amortized cost basis. - Clarifies that an entity should assess whether it reasonably expects the borrower will be able to continually replenish collateral securing the financial asset to apply the practical expedient related to collateral maintenance provision. - Management adopted the amendments on January 1, 2020. - The ASU 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 2019-12 - Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes Issued: December 2019 - The ASU simplifies the accounting for income taxes by removing exceptions to the: (a) Incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items; (b) Requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment; (c) Ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary; and (d) General methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. - The ASU also simplifies various other aspects of the accounting for income taxes. - The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. - Early adoption of the ASU is permitted, including adoption in any interim period for which financial statements have not yet been issued. An entity that elects to early adopt in an interim period should reflect any adjustments as of the beginning of the annual period that includes that interim period. - The ASU is not expected to have a material impact on Huntington’s Unaudited Condensed Consolidated Financial Statements. ASU 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting Issued: March 2020 - The ASU provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met, including the following: - Modifications of contracts within the scope of Topics 310, Receivables, and 470, Debt, should be accounted for by prospectively adjusting the effective interest rate. - Modifications of contracts within the scope of Topic 842, Leases, should be accounted for as a continuation of the existing contracts with no reassessments of the lease classification and the discount rate. - Modifications of contracts do not require an entity to reassess its original conclusion about whether that contract contains an embedded derivative that is clearly and closely related to the economic characteristics and risks of the host contract under Topic 815. - The ASU also provides optional expedients for various hedging relationships and do not require de-designation of hedging relationships if certain criteria are met. - An entity may make a one time election to sell, transfer, or both sell and transfer debt securities classified as held to maturity that reference a rate affected by reference rate reform and that are classified as held to maturity before January 1, 2020. - The ASU is effective for all entities from the beginning of an interim period that includes or is subsequent to March 12, 2020 through December 31, 2022. - The ASU is not expected to have a material impact Huntington’s Unaudited Condensed Consolidated Financial Statements.

INVESTMENT SECURITIES AND OTHER

INVESTMENT SECURITIES AND OTHER SECURITIES	6 Months Ended
INVESTMENT SECURITIES AND OTHER SECURITIES	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities Disclosure [Text Block]	INVESTMENT SECURITIES AND OTHER SECURITIES Debt securities purchased in which Huntington has the 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 June 30, 2020 and December 31, 2019 : Unrealized (dollar amounts in millions) Amortized Cost Gross Gains Gross Losses Fair Value June 30, 2020 Available-for-sale securities: U.S. Treasury $ 8 $ — $ — $ 8 Federal agencies: Residential CMO 4,933 185 — 5,118 Residential MBS 3,718 120 — 3,838 Commercial MBS 764 24 — 788 Other agencies 144 3 — 147 Total U.S. Treasury, federal agency and other agency securities 9,567 332 — 9,899 Municipal securities 3,145 47 (35 ) 3,157 Private-label CMO 5 — — 5 Asset-backed securities 208 3 — 211 Corporate debt 22 — (1 ) 21 Other securities/Sovereign debt 4 — — 4 Total available-for-sale securities $ 12,951 $ 382 $ (36 ) $ 13,297 Held-to-maturity securities: Federal agencies: Residential CMO $ 2,151 $ 106 $ — $ 2,257 Residential MBS 3,361 120 — 3,481 Commercial MBS 3,631 202 — 3,833 Other agencies 269 12 — 281 Total federal agency and other agency securities 9,412 440 — 9,852 Municipal securities 4 — — 4 Total held-to-maturity securities $ 9,416 $ 440 $ — $ 9,856 Other securities, at cost: Non-marketable equity securities: Federal Home Loan Bank stock $ 84 $ — $ — $ 84 Federal Reserve Bank stock 298 — — 298 Other securities, at fair value Mutual funds 52 — — 52 Marketable equity securities 3 1 — 4 Total other securities $ 437 $ 1 $ — $ 438 Unrealized (dollar amounts in millions) Amortized Gross Gross Fair Value December 31, 2019 Available-for-sale securities: U.S. Treasury $ 10 $ — $ — $ 10 Federal agencies: Residential CMO 5,055 48 (18 ) 5,085 Residential MBS 4,180 45 (3 ) 4,222 Commercial MBS 979 1 (4 ) 976 Other agencies 165 1 (1 ) 165 Total U.S. Treasury, federal agency and other agency securities 10,389 95 (26 ) 10,458 Municipal securities 3,044 34 (23 ) 3,055 Private-label CMO 2 — — 2 Asset-backed securities 575 6 (2 ) 579 Corporate debt 49 2 — 51 Other securities/Sovereign debt 4 — — 4 Total available-for-sale securities $ 14,063 $ 137 $ (51 ) $ 14,149 Held-to-maturity securities: Federal agencies: Residential CMO $ 2,351 $ 33 $ (3 ) $ 2,381 Residential MBS 2,463 50 — 2,513 Commercial MBS 3,959 34 — 3,993 Other agencies 293 2 — 295 Total federal agency and other agency securities 9,066 119 (3 ) 9,182 Municipal securities 4 — — 4 Total held-to-maturity securities $ 9,070 $ 119 $ (3 ) $ 9,186 Other securities, at cost: Non-marketable equity securities: Federal Home Loan Bank stock $ 90 $ — $ — $ 90 Federal Reserve Bank stock 297 — — 297 Other securities, at fair value Mutual funds 53 — — 53 Marketable equity securities 1 — — 1 Total other securities $ 441 $ — $ — $ 441 The following table provides the amortized cost and fair value of securities by contractual maturity at June 30, 2020 and December 31, 2019 . Expected maturities may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without incurring penalties. June 30, 2020 December 31, 2019 (dollar amounts in millions) Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities: Under 1 year $ 344 $ 337 $ 231 $ 229 After 1 year through 5 years 1,166 1,159 1,196 1,189 After 5 years through 10 years 1,410 1,421 1,594 1,606 After 10 years 10,031 10,380 11,042 11,125 Total available-for-sale securities $ 12,951 $ 13,297 $ 14,063 $ 14,149 Held-to-maturity securities: Under 1 year $ — $ — $ — $ — After 1 year through 5 years 141 149 17 17 After 5 years through 10 years 181 190 300 305 After 10 years 9,094 9,517 8,753 8,864 Total held-to-maturity securities $ 9,416 $ 9,856 $ 9,070 $ 9,186 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 June 30, 2020 and December 31, 2019 : Less than 12 Months Over 12 Months Total (dollar amounts in millions) Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized June 30, 2020 Available-for-sale securities: Federal agencies: Residential CMO $ 74 $ — $ — $ — $ 74 $ — Residential MBS — — — — — Commercial MBS — — — — — — Other agencies — — — — — — Total federal agency and other agency securities 74 — — — 74 — Municipal securities 428 (8 ) 1,023 (27 ) 1,451 (35 ) Asset-backed securities 26 — 56 — 82 — Corporate debt 13 (1 ) — — 13 (1 ) Total temporarily impaired securities $ 541 $ (9 ) $ 1,079 $ (27 ) $ 1,620 $ (36 ) Held-to-maturity securities: Federal agencies: Residential CMO $ — $ — $ — $ — $ — $ — Residential MBS — — — — — — Commercial MBS — — — — — — Other agencies — — — — — — Total federal agency and other agency securities — — — — — — Municipal securities — — — — — — Total temporarily impaired securities $ — $ — $ — $ — $ — $ — Less than 12 Months Over 12 Months Total (dollar amounts in millions) Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized December 31, 2019 Available-for-sale securities: Federal agencies: Residential CMO $ 1,206 $ (10 ) $ 519 $ (8 ) $ 1,725 $ (18 ) Residential MBS 1,169 (3 ) 9 — 1,178 (3 ) Commercial MBS 472 (2 ) 272 (2 ) 744 (4 ) Other agencies 86 (1 ) — — 86 (1 ) Total federal agency and other agency securities 2,933 (16 ) 800 (10 ) 3,733 (26 ) Municipal securities 273 (4 ) 1,204 (19 ) 1,477 (23 ) Asset-backed securities 116 (1 ) 37 (1 ) 153 (2 ) Corporate debt 1 — — — 1 — Total temporarily impaired securities $ 3,323 $ (21 ) $ 2,041 $ (30 ) $ 5,364 $ (51 ) Held-to-maturity securities: Federal agencies: Residential CMO $ 218 $ (1 ) $ 112 $ (2 ) $ 330 $ (3 ) Residential MBS 317 — — — 317 — Commercial MBS 81 — — — 81 — Other agencies 58 — — — 58 — Total federal agency and other agency securities 674 (1 ) 112 (2 ) 786 (3 ) Municipal securities 4 — — — 4 — Total temporarily impaired securities $ 678 $ (1 ) $ 112 $ (2 ) $ 790 $ (3 ) During the 2020 first quarter, Huntington transferred $1.5 billion of securities from the AFS portfolio to the HTM portfolio. At the time of the transfer, AOCI included $22 million of unrealized gains attributed to these securities. This gain will be amortized into interest income over the remaining life of the securities. At June 30, 2020 and December 31, 2019 , the carrying value of investment securities pledged to secure public and trust deposits, trading account liabilities, U.S. Treasury demand notes, security repurchase agreements and to support borrowing capacity totaled $18.5 billion and $3.8 billion , respectively. There were no securities of a single issuer, which were not governmental or government-sponsored, that exceeded 10% of shareholders’ equity at either June 30, 2020 or December 31, 2019 . At June 30, 2020 , all HTM debt securities are considered AAA rated. In addition, there were no HTM debt securities considered past due at June 30, 2020 . Securities Impairment Based on an evaluation of available information about past events, current conditions, and reasonable and supportable forecasts that are relevant to collectability, Huntington has concluded that it expects to receive all contractual cash flows from each security held in its AFS and HTM debt securities portfolio. As such, no allowance is recorded with respect to securities as of June 30, 2020 .

LOANS AND LEASES LOANS AND LEAS

LOANS AND LEASES LOANS AND LEASES (Notes)	6 Months Ended
LOANS AND LEASES LOANS AND LEASES (Notes)	Jun. 30, 2020
Receivables [Abstract]
Financing Receivables [Text Block]	LOANS / LEASES 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 of unamortized premiums, discounts, fees, and costs, recognized as part of loans and leases, was a net premium of $384 million and $525 million at June 30, 2020 and December 31, 2019 , respectively. Loan and Lease Portfolio Composition The following table provides a detailed listing of Huntington’s loan and lease portfolio at June 30, 2020 and December 31, 2019 . (dollar amounts in millions) June 30, 2020 December 31, 2019 Loans and leases: Commercial and industrial $ 34,879 $ 30,664 Commercial real estate 7,179 6,674 Automobile 12,678 12,797 Home equity 8,866 9,093 Residential mortgage 11,621 11,376 RV and marine 3,843 3,563 Other consumer 1,073 1,237 Loans and leases $ 80,139 $ 75,404 Allowance for loan and lease losses (1,702 ) (783 ) Net loans and leases $ 78,437 $ 74,621 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. Huntington assesses net investments in leases (including residual values) for impairment and recognizes 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 June 30, 2020 and December 31, 2019 . (dollar amounts in millions) June 30, December 31, Commercial and industrial: Lease payments receivable $ 1,762 $ 1,841 Estimated residual value of leased assets 691 728 Gross investment in commercial and industrial lease financing receivables 2,453 2,569 Deferred origination costs 19 19 Deferred fees (214 ) (249 ) Total net investment in commercial and industrial lease financing receivables $ 2,258 $ 2,339 The carrying value of residual values guaranteed was $96 million and $95 million as of June 30, 2020 and December 31, 2019 , respectively. The future lease rental payments due from customers on sales-type and direct financing leases at June 30, 2020 , totaled $1.8 billion and were due as follows: $0.6 billion in 2021 , $0.5 billion in 2022 , $0.3 billion in 2023 , $0.2 billion in 2024 , $0.1 billion in 2025 , and $0.1 billion thereafter. Interest income recognized for these types of leases was $28 million and $27 million for the three-month periods ended June 30, 2020 and 2019 , respectively. For the six-month periods ended June 30, 2020 and 2019 , interest income recognized was $55 million and $53 million , respectively. 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, 2019 for a description of the accounting policies related to the NALs. The following table presents NALs by loan class at June 30, 2020 and December 31, 2019 (1): June 30, 2020 December 31, 2019 (dollar amounts in millions) Nonaccrual loans with no ACL Total nonaccrual loans Nonaccrual loans with no ACL Total nonaccrual loans Commercial and industrial $ 97 $ 485 $ 109 $ 323 Commercial real estate 6 28 2 10 Automobile — 8 — 4 Home equity — 59 — 59 Residential mortgage — 66 — 71 RV and marine — 2 — 1 Other consumer — — — — Total nonaccrual loans $ 103 $ 648 $ 111 $ 468 (1) Generally excludes loans that were under payment deferral or granted other assistance, including amendments or waivers of financial covenants in response to the COVID-19 pandemic. The following table presents an aging analysis of loans and leases, including past due loans and leases, by loan class at June 30, 2020 and December 31, 2019 : June 30, 2020 Past Due (1)(2) Loans Accounted for Under FVO Total Loans 90 or (dollar amounts in millions) 30-59 60-89 90 or Total Current Commercial and industrial $ 46 $ 24 $ 87 $ 157 $ 34,722 $ — $ 34,879 $ 13 (3) Commercial real estate 3 21 4 28 7,151 — 7,179 — Automobile 47 14 14 75 12,603 — 12,678 8 Home equity 26 12 48 86 8,779 1 8,866 10 Residential mortgage 75 24 194 293 11,237 91 11,621 158 (4) RV and marine 8 3 3 14 3,829 — 3,843 2 Other consumer 6 2 3 11 1,062 — 1,073 3 Total loans and leases $ 211 $ 100 $ 353 $ 664 $ 79,383 $ 92 $ 80,139 $ 194 December 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 $ 65 $ 31 $ 69 $ 165 $ 30,499 $ — $ 30,664 $ 11 (3) Commercial real estate 3 1 7 11 6,663 — 6,674 — Automobile 95 19 11 125 12,672 — 12,797 8 Home equity 50 19 51 120 8,972 1 9,093 14 Residential mortgage 103 49 170 322 10,974 80 11,376 129 (4) RV and marine 13 4 2 19 3,544 — 3,563 2 Other consumer 13 6 7 26 1,211 — 1,237 7 Total loans and leases $ 342 $ 129 $ 317 $ 788 $ 74,535 $ 81 $ 75,404 $ 171 (1) NALs are included in this aging analysis based on the loan’s past due status. (2) At June 30, 2020, the principal balance of loans in payment deferral programs offered in response to the COVID-19 pandemic which are performing according to their modified terms are generally not considered delinquent. (3) Amounts include Huntington Technology Finance administrative lease delinquencies. (4) Amounts include mortgage loans insured by U.S. government agencies. Credit Quality Indicators See Note 4 “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, 2019 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 resulting from 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 borrower’s 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. For all classes within the consumer loan portfolio, loans are assigned pool level PD factors based on the FICO range within which the borrower’s credit bureau score falls. A credit bureau score is a credit score developed by FICO based on data provided by the credit bureaus. The credit bureau score is widely accepted as the standard measure of consumer credit risk used by lenders, regulators, rating agencies, and consumers. The higher the credit bureau score, the higher likelihood of repayment and therefore, an indicator of higher credit quality. Huntington assesses the risk in the loan portfolio by utilizing numerous risk characteristics. The classifications described above, and also presented in the table below, represent one of those characteristics that are closely monitored in the overall credit risk management processes. The following table presents each loan and lease class by vintage and credit quality indicator at June 30, 2020 : As of June 30, 2020 Term Loans Amortized Cost Basis by Origination Year Revolver Total at Amortized Cost Basis Revolver Total Converted to Term Loans (dollar amounts in millions) 2020 2019 2018 2017 2016 Prior Total (3) Commercial and industrial Credit Quality Indicator (1): Pass $ 9,667 $ 5,916 $ 3,675 $ 1,937 $ 1,236 $ 1,369 $ 8,112 $ 3 $ 31,915 OLEM 348 118 146 59 77 33 268 — 1,049 Substandard 241 187 279 194 91 204 711 — 1,907 Doubtful 2 — 5 — — 1 — — 8 Total Commercial and industrial $ 10,258 $ 6,221 $ 4,105 $ 2,190 $ 1,404 $ 1,607 $ 9,091 $ 3 $ 34,879 Commercial real estate Credit Quality Indicator (1): Pass $ 1,023 $ 1,616 $ 1,287 $ 603 $ 610 $ 700 $ 720 $ — $ 6,559 OLEM 44 140 100 59 23 32 37 — 435 Substandard 19 30 11 37 56 20 10 — 183 Doubtful — — — — — 2 — — 2 Total Commercial real estate $ 1,086 $ 1,786 $ 1,398 $ 699 $ 689 $ 754 $ 767 $ — $ 7,179 Automobile Credit Quality Indicator (2): 750+ $ 1,389 $ 2,367 $ 1,442 $ 1,025 $ 449 $ 170 $ — $ — $ 6,842 650-749 921 1,752 1,011 551 247 100 — — 4,582 <650 125 391 327 226 118 67 — — 1,254 Total Automobile $ 2,435 $ 4,510 $ 2,780 $ 1,802 $ 814 $ 337 $ — $ — $ 12,678 Home equity Credit Quality Indicator (2): 750+ $ 236 $ 32 $ 36 $ 39 $ 110 $ 547 $ 4,511 $ 193 $ 5,704 650-749 38 12 10 14 31 198 2,130 189 2,622 <650 — 1 1 1 7 86 329 114 539 Total Home equity $ 274 $ 45 $ 47 $ 54 $ 148 $ 831 $ 6,970 $ 496 $ 8,865 Residential mortgage Credit Quality Indicator (2): 750+ $ 1,492 $ 1,664 $ 1,236 $ 1,384 $ 950 $ 1,608 $ — $ — $ 8,334 650-749 512 586 418 322 209 565 — — 2,612 <650 12 35 67 75 58 337 — — 584 Total Residential mortgage $ 2,016 $ 2,285 $ 1,721 $ 1,781 $ 1,217 $ 2,510 $ — $ — $ 11,530 RV and marine Credit Quality Indicator (2): 750+ $ 562 $ 585 $ 682 $ 386 $ 174 $ 300 $ — $ — $ 2,689 650-749 131 263 239 165 77 159 — — 1,034 <650 2 16 25 27 14 36 — — 120 Total RV and marine $ 695 $ 864 $ 946 $ 578 $ 265 $ 495 $ — $ — $ 3,843 Other consumer Credit Quality Indicator (2): 750+ $ 52 $ 69 $ 32 $ 11 $ 5 $ 10 $ 325 $ 2 $ 506 650-749 21 74 25 8 3 5 311 32 479 <650 1 11 4 2 1 1 30 38 88 Total Other consumer $ 74 $ 154 $ 61 $ 21 $ 9 $ 16 $ 666 $ 72 $ 1,073 (1) Consistent with the credit quality disclosures, indicators for the Commercial portfolio are based on internally defined categories of credit grades which are generally refreshed at least semi-annually. (2) Consistent with the credit quality disclosures, indicators for the Consumer portfolio are based on updated customer credit scores refreshed at least quarterly. (3) The total amount of accrued interest recorded for these loans at June 30, 2020, presented in Other assets within the Condensed Consolidated Balance Sheets, was $106 million and $127 million of commercial and consumer, respectively. The following table presents each loan and lease class by credit quality indicator at December 31, 2019 . December 31, 2019 (dollar amounts in millions) Credit Risk Profile by UCS Classification Commercial Pass OLEM Substandard Doubtful Total Commercial and industrial $ 28,477 $ 634 $ 1,551 $ 2 $ 30,664 Commercial real estate 6,487 98 88 1 6,674 Credit Risk Profile by FICO Score (1), (2) Consumer 750+ 650-749 <650 Total Automobile $ 6,759 $ 4,661 $ 1,377 $ 12,797 Home equity 5,763 2,772 557 9,092 Residential mortgage 7,976 2,742 578 11,296 RV and marine 2,391 1,053 119 3,563 Other consumer 546 571 120 1,237 (1) Excludes loans accounted for under the fair value option. (2) Reflects updated customer credit scores. Collateral-dependent Loans Certain commercial and consumer loans for which repayment is expected to be provided substantially through the operation or sale of the loan collateral are considered to be collateral-dependent. Commercial collateral-dependent loans are generally secured by business assets and/or commercial real estate. Consumer collateral-dependent loans are primarily secured by residential real estate. 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 would not otherwise be considered. However, not all loan modifications are TDRs. See Note 4 “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, 2019 for an additional discussion of TDRs. On March 22, 2020 and April 7, 2020, the federal bank regulatory agencies including the FRB and OCC released statements encouraging financial institutions to work prudently with borrowers that may be unable to meet their contractual obligations because of the effects of COVID-19. The statements go on to explain that, in consultation with the FASB staff, the federal bank regulatory agencies concluded that short-term modifications (e.g. six months) made on a good faith basis to borrowers who were current as of the implementation date of a relief program are not TDRs. Section 4013 of the CARES Act further addresses COVID-19 related modifications and specifies that COVID-19 related modifications on loans that were current as of December 31, 2019 are not TDRs. For COVID-19 related loan modifications which occurred from March 1, 2020 through June 30,2020, and met the loan modification criteria under the CARES Act, Huntington elected to suspend TDR accounting for such loan modifications. For loan modifications not eligible for the CARES Act, Huntington applied the interagency regulatory guidance that was clarified on April 7, 2020. Accordingly, insignificant concessions (related to the current COVID- 19 crisis) granted through payment deferrals, fee waivers, or other short-term modifications (generally 6 months or less) and provided to borrowers less than 30 days past due at March 17, 2020 were not be deemed to be TDRs. Therefore, modified loans that met the required guidelines for relief are excluded from the TDR disclosures below. 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 and six-month periods ended June 30, 2020 and 2019 . New Troubled Debt Restructurings (1) Three Months Ended June 30, 2020 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 98 $ — $ 26 $ — $ 52 $ 78 Commercial real estate 2 — 1 — — 1 Automobile 1,058 — 14 2 — 16 Home equity 63 — 2 1 — 3 Residential mortgage 105 — 12 2 — 14 RV and marine 68 — 3 — — 3 Other consumer 142 1 — — — 1 Total new TDRs 1,536 $ 1 $ 58 $ 5 $ 52 $ 116 Three Months Ended June 30, 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 101 $ — $ 39 $ — $ — $ 39 Commercial real estate 6 — 2 — — 2 Automobile 650 — 4 2 — 6 Home equity 68 — 2 1 — 3 Residential mortgage 96 — 10 1 — 11 RV and marine 31 — — 2 — 2 Other consumer 343 2 — — — 2 Total new TDRs 1,295 $ 2 $ 57 $ 6 $ — $ 65 New Troubled Debt Restructurings (1) Six Months Ended June 30, 2020 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 238 $ — $ 88 $ — $ 58 $ 146 Commercial real estate 9 — 3 — — 3 Automobile 1,856 — 20 4 — 24 Home equity 126 — 3 3 — 6 Residential mortgage 206 — 21 4 — 25 RV and marine finance 96 — 4 — — 4 Other consumer 391 2 — — — 2 Total new TDRs 2,922 $ 2 $ 139 $ 11 $ 58 $ 210 Six Months Ended June 30, 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 216 $ — $ 74 $ — $ — $ 74 Commercial real estate 14 — 11 — — 11 Automobile 1,394 — 9 4 — 13 Home equity 172 — 5 3 — 8 Residential mortgage 172 — 18 1 — 19 RV and marine finance 67 — — 1 — 1 Other consumer 587 3 — — — 3 Total new TDRs 2,622 $ 3 $ 117 $ 9 $ — $ 129 (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 on the provision (recovery) for loan and lease losses. Amounts for the three-month periods ended June 30, 2020 and 2019 , were $ 1 million and less than $1 million respectively. For the six-month periods ended June 30, 2020 and 2019 , the financial effects of modification were $(4) million and $(3) million , respectively. Pledged Loans and Leases The Bank has access to the Federal Reserve’s discount window and advances from the FHLB. As of June 30, 2020 and December 31, 2019 , these borrowings and advances are secured by $42.8 billion and $39.6 billion , respectively, of loans.

ALLOWANCE FOR CREDIT LOSSES

ALLOWANCE FOR CREDIT LOSSES	6 Months Ended
ALLOWANCE FOR CREDIT LOSSES	Jun. 30, 2020
Credit Loss [Abstract]
Allowance for Credit Losses	ALLOWANCE FOR CREDIT LOSSES On January 1, 2020, Huntington adopted ASU 2016-13 Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments, which replaced the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The measurement of expected credit losses under CECL is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet exposures not accounted for as insurance and net investments in leases accounted for under ASC Topic 842. Additionally, ASC Topic 326 made changes to the accounting for AFS debt securities, including a requirement to present credit losses as an allowance rather than as a write-down on AFS debt securities that management does not intend to sell, or believes will not be required to sell. Huntington adopted ASC Topic 326 using the modified retrospective method for all financial assets in scope of the standard. Results for reporting periods beginning after January 1, 2020 are presented under ASC Topic 326, while prior period amounts continue to be reported in accordance with previously applicable GAAP. Upon adoption, Huntington recorded an increase to the ACL of $393 million and a corresponding decrease to retained earnings of approximately $306 million , net of tax of $87 million . The overall increase to the ACL at adoption is comprised of a $180 million increase in the commercial ALLL, a $211 million increase in the consumer ALLL, and a $2 million increase to the AULC. The allowance for credit losses is deducted from the amortized cost basis of a financial asset or a group of financial assets so that the balance sheet reflects the net amount Huntington expects to collect. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts, fair value hedge accounting adjustments, and deferred fees and costs. Subsequent changes (favorable and unfavorable) in expected credit losses are recognized immediately in net income as a credit loss expense or a reversal of credit loss expense. Management estimates the allowance by projecting probability-of-default, loss-given-default and exposure-at-default depending on economic parameters for each month of the remaining contractual term. Those economic parameters are developed using available information relating to past events, current conditions, and reasonable and supportable forecasts. Huntington’s reasonable and supportable forecast period reverts to a historical norm based on inputs within approximately two to three years. The reversion period is dependent on the state of the economy at the beginning of the forecast. Historical credit experience provides the basis for the estimation of expected credit losses, with adjustments made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency levels and terms, as well as for changes in the micro- and macro-economic environments. The contractual terms of financial assets are adjusted for expected prepayments and any extensions outside of Huntington’s control. Loans that are determined to have unique risk characteristics are evaluated on an individual basis by management. If a loan is determined to be collateral dependent, or meets the criteria to apply the collateral dependent practical expedient, expected credit losses are determined based on the fair value of the collateral at the reporting date, less costs to sell as appropriate. Loans with unique risk characteristics that are not subject to collateral dependent accounting, are assessed using a discounted cash flows methodology. The allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist. Management believes the products within each of the entity’s portfolio classes exhibit similar risk characteristics. Huntington has identified its portfolio classes as disclosed above. Allowance for Credit Losses - HTM Securities Nearly all of Huntington’s HTM debt securities are issued by U.S. government entities and agencies. These securities are either explicitly or implicitly guaranteed by the U.S. government, are highly rated by major rating agencies, and have a long history of no credit losses. As such, there is currently zero loss expectation for this portfolio. Allowance for Credit Losses - AFS Securities For individual debt securities classified as AFS, Huntington assesses whether a decline in fair value below the amortized cost basis has resulted from a credit loss or other factors. Any impairment relating to credit losses would be recognized through an allowance for credit losses. At June 30, 2020 , it was determined that no allowance was required. Any impairment due to factors other than a credit loss, such as changes in market interest rates, is recognized in other comprehensive income, net of applicable taxes. Impairment is determined on an individual security basis. Therefore, an AFS debt security cannot be combined with other securities to determine whether the collective securities are impaired. Allowance for Loan and Lease Losses and Allowance for Credit Losses - Roll-forward The following table presents ALLL and AULC activity by portfolio segment for the three-month and six-month periods ended June 30, 2020 and 2019 . (dollar amounts in millions) Commercial Consumer Total Three-month period ended June 30, 2020: ALLL balance, beginning of period $ 996 $ 508 $ 1,504 Loan charge-offs (84 ) (39 ) (123 ) Recoveries of loans previously charged-off 4 12 16 Provision for loan and lease losses 253 52 305 ALLL balance, end of period $ 1,169 $ 533 $ 1,702 AULC balance, beginning of period $ 58 $ 41 $ 99 Provision (reduction in allowance) for unfunded loan commitments and letters of credit 25 (3 ) 22 Unfunded commitment losses (2 ) — (2 ) AULC balance, end of period $ 81 $ 38 $ 119 ACL balance, end of period $ 1,250 $ 571 $ 1,821 Six-month period ended June 30, 2020: ALLL balance, beginning of period $ 552 $ 231 $ 783 Cumulative-effect of change in accounting principle for financial instruments - credit losses (1) 180 211 391 Loan charge-offs (172 ) (87 ) (259 ) Recoveries of loans previously charged-off 9 26 35 Provision for loan and lease losses 600 152 752 ALLL balance, end of period $ 1,169 $ 533 $ 1,702 AULC balance, beginning of period $ 102 $ 2 $ 104 Cumulative-effect of change in accounting principle for financial instruments - credit losses (1) 2 — 2 Provision (reduction in allowance) for unfunded loan commitments and letters of credit (20 ) 36 16 Unfunded commitment losses (3 ) — (3 ) AULC balance, end of period $ 81 $ 38 $ 119 ACL balance, end of period $ 1,250 $ 571 $ 1,821 (1) Relates to day one impact of the CECL adjustment as a result of the implementation of ASU 2016-13. (dollar amounts in millions) Commercial Consumer Total Three-month period ended June 30, 2019: ALLL balance, beginning of period $ 545 $ 219 $ 764 Loan charge-offs (24 ) (46 ) (70 ) Recoveries of loans previously charged-off 6 16 22 Provision for loan and lease losses 33 25 58 ALLL balance, end of period $ 560 $ 214 $ 774 AULC balance, beginning of period $ 98 $ 2 $ 100 Provision (reduction in allowance) for unfunded loan commitments and letters of credit 1 — 1 AULC balance, end of period $ 99 $ 2 $ 101 ACL balance, end of period $ 659 $ 216 $ 875 Six-month period ended June 30, 2019: ALLL balance, beginning of period $ 542 $ 230 $ 772 Loan charge-offs (70 ) (97 ) (167 ) Recoveries of loans previously charged-off 19 29 48 Provision for loan and lease losses 69 52 121 ALLL balance, end of period $ 560 $ 214 $ 774 AULC balance, beginning of period $ 94 $ 2 $ 96 Provision (reduction in allowance) for unfunded loan commitments and letters of credit 5 — 5 AULC balance, end of period $ 99 $ 2 $ 101 ACL balance, end of period $ 659 $ 216 $ 875 At June 30, 2020 , the ACL was $1.8 billion , an increase of $934 million from the December 31, 2019 balance of $887 million . Of the increase, $541 million relates primarily to the deteriorating economic outlook resulting from the COVID-19 pandemic, with the remaining $393 million related to transition to the CECL lifetime loss methodology. The majority of the increase was related to the commercial portfolio. Huntington has elected to exclude accrued interest receivable from the measurement of its ACL. For all classes within all loan portfolios, when a loan is placed on nonaccrual status, any outstanding accrued interest is reversed against interest income.

MORTGAGE LOAN SALES AND SERVICI

MORTGAGE LOAN SALES AND SERVICING RIGHTS	6 Months Ended
MORTGAGE LOAN SALES AND SERVICING RIGHTS	Jun. 30, 2020
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 and six-month periods ended June 30, 2020 and 2019 : Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Residential mortgage loans sold with servicing retained $ 2,287 $ 954 $ 3,715 $ 1,787 Pretax gains resulting from above loan sales (1) 59 23 98 35 (1) Recorded in mortgage banking income On January 1, 2020, Huntington made an irrevocable election to subsequently measure all classes of residential MSRs at fair value in order to eliminate any potential measurement mismatch between our economic hedges and the MSRs. The impact of the irrevocable election was not material. The following table summarizes the changes in MSRs recorded using the fair value method for the three-month and six-month periods ended June 30, 2020 and 2019 (1): Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 (1) 2020 2019 (1) Fair value, beginning of period $ 165 $ 10 $ 7 $ 10 Fair value election for servicing assets previously measured using the amortized method — — 205 — New servicing assets created 26 — 40 — Change in fair value during the period due to: Time decay (2) (2 ) — (4 ) — Payoffs (3) (10 ) — (16 ) — Changes in valuation inputs or assumptions (4) (7 ) (1 ) (60 ) (1 ) Fair value, end of period $ 172 $ 9 $ 172 $ 9 Weighted-average life (years) 6.5 6.4 6.5 6.4 (1) Prior to January 1, 2020, substantially all of Huntington’s MSR assets were recorded at amortized cost. (2) Represents decrease in value due to passage of time, including the impact from both regularly scheduled loan principal payments and partial loan paydowns. (3) Represents decrease in value associated with loans that paid off during the period. (4) Represents change in value resulting primarily from market-driven changes in interest rates and prepayment speeds. 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 fair value method, a summary of key assumptions and the sensitivity of the MSR value to changes in these assumptions at June 30, 2020 , and December 31, 2019 follows: June 30, 2020 December 31, 2019 (1) 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) 17.32 % $ (9 ) $ (17 ) 8.21 % $ — $ — Spread over forward interest rate swap rates 793 bps (5 ) (9 ) 824 bps — — (1) Prior to January 1, 2020, substantially all of Huntington’s MSR assets were recorded at amortized cost. Total servicing, late fees and other ancillary fees included in mortgage banking income was $14 million and $16 million for the three-month periods ended June 30, 2020 and 2019 , respectively. For the six-month periods ended June 30, 2020 and 2019, total servicing, late fees and other ancillary fees included in mortgage banking income was $31 million and $31 million , respectively. The unpaid principal balance of residential mortgage loans serviced for third parties was $23.2 billion and $22.4 billion at June 30, 2020 and December 31, 2019 , respectively.

LONG-TERM DEBT

LONG-TERM DEBT	6 Months Ended
LONG-TERM DEBT	Jun. 30, 2020
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT In January 2020, the Bank issued $500 million of senior notes at 99.916% of face value. The senior notes mature on February 3, 2023 and have a fixed coupon rate of 1.800% . The senior notes may be redeemed one month prior to the maturity date at 100% of principal plus accrued and unpaid interest. In January 2020, Huntington issued $750 million of senior notes at 99.597% of face value. The senior notes mature on February 4, 2030 and have a fixed coupon rate of 2.55% . The senior notes may be redeemed three months prior to the maturity date at 100% of principal plus accrued and unpaid interest.

OTHER COMPREHENSIVE INCOME

OTHER COMPREHENSIVE INCOME	6 Months Ended
OTHER COMPREHENSIVE INCOME	Jun. 30, 2020
Equity [Abstract]
OTHER COMPREHENSIVE INCOME	OTHER COMPREHENSIVE INCOME The components of Huntington’s OCI for the three-month and six-month periods ended June 30, 2020 and 2019 , 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 $ 57 $ (13 ) $ 44 Less: Reclassification adjustment for realized net losses (gains) included in net income 23 (5 ) 18 Net change in unrealized holding gains (losses) on available-for-sale securities 80 (18 ) 62 Net change in fair value on cash flow hedges 14 (3 ) 11 Net change in pension and other post-retirement obligations (1) (12 ) 2 (10 ) Total other comprehensive income (loss) $ 82 $ (19 ) $ 63 (1) Includes a settlement gain recognized in other noninterest income on the Unaudited Condensed Consolidated Statements of Income. 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 $ 163 $ (36 ) $ 127 Less: Reclassification adjustment for realized net losses (gains) included in net income 9 (2 ) 7 Net change in unrealized gains (losses) on available-for-sale securities 172 (38 ) 134 Net change in fair value on cash flow hedges 60 (13 ) 47 Net change in pension and other post-retirement obligations 1 — 1 Total other comprehensive income (loss) $ 233 $ (51 ) $ 182 Six Months Ended Tax (expense) (dollar amounts in millions) Pretax Benefit After-tax Unrealized holding gains (losses) on available-for-sale securities arising during the period $ 274 $ (61 ) $ 213 Less: Reclassification adjustment for realized net losses (gains) included in net income 28 (6 ) 22 Net change in unrealized holding gains (losses) on available-for-sale securities 302 (67 ) 235 Net change in fair value on cash flow hedges 409 (90 ) 319 Net change in pension and other post-retirement obligations (1) (10 ) 2 (8 ) Total other comprehensive income (loss) $ 701 $ (155 ) $ 546 (1) Includes a settlement gain recognized in other noninterest income on the Unaudited Condensed Consolidated Statements of Income. Six Months Ended Tax (expense) (dollar amounts in millions) Pretax Benefit After-tax Unrealized holding gains (losses) on available-for-sale securities arising during the period $ 347 $ (77 ) $ 270 Less: Reclassification adjustment for realized net losses (gains) included in net income 13 (3 ) 10 Net change in unrealized holding gains (losses) on available-for-sale securities 360 (80 ) 280 Net change in fair value on cash flow hedges 68 (14 ) 54 Net change in pension and other post-retirement obligations 2 — 2 Total other comprehensive income (loss) $ 430 $ (94 ) $ 336 Activity in accumulated OCI for the three-month and six-month periods ended June 30, 2020 and 2019 , 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 (2) Total Three Months Ended June 30, 2020 Balance, beginning of period $ 145 $ 331 $ (249 ) $ 227 Other comprehensive income before reclassifications 44 11 — 55 Amounts reclassified from accumulated OCI to earnings 18 — (10 ) 8 Period change 62 11 (10 ) 63 Balance, end of period $ 207 $ 342 $ (259 ) $ 290 Three Months Ended June 30, 2019 Balance, beginning of period $ (217 ) $ 7 $ (245 ) $ (455 ) Other comprehensive income before reclassifications 127 47 — 174 Amounts reclassified from accumulated OCI to earnings 7 — 1 8 Period change 134 47 1 182 Balance, end of period $ (83 ) $ 54 $ (244 ) $ (273 ) (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 (2) Total Six Months Ended June 30, 2020 Balance, beginning of period $ (28 ) $ 23 $ (251 ) $ (256 ) Other comprehensive income before reclassifications 213 319 — 532 Amounts reclassified from accumulated OCI to earnings 22 — (8 ) 14 Period change 235 319 (8 ) 546 Balance, end of period $ 207 $ 342 $ (259 ) $ 290 Six Months Ended June 30, 2019 Balance, beginning of period $ (363 ) $ — $ (246 ) $ (609 ) Other comprehensive income before reclassifications 270 54 — 324 Amounts reclassified from accumulated OCI to earnings 10 — 2 12 Period change 280 54 2 336 Balance, end of period $ (83 ) $ 54 $ (244 ) $ (273 ) (1) AOCI amounts at June 30, 2020 , March 31, 2020 and June 30, 2019 include $81 million , $87 million and $131 million , respectively, net of 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. (2) Amounts for the three months and six months ended June 30, 2020 include a settlement gain recognized in other noninterest income on the Unaudited Condensed Consolidated Statements of Income.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	6 Months Ended
SHAREHOLDERS' EQUITY	Jun. 30, 2020
Equity [Abstract]
SHAREHOLDERS' EQUITY	SHAREHOLDERS’ EQUITY The following is a summary of Huntington’s non-cumulative, non-voting, perpetual preferred stock outstanding as of June 30, 2020 . (dollar amounts in millions) Series Issuance Date Total Shares Outstanding Carrying Amount Dividend Rate Earliest Redemption Date Series B 12/28/2011 35,500 $ 23 3-mo. LIBOR + 270 bps 1/15/2017 Series D 3/21/2016 400,000 386 6.25 % 4/15/2021 Series D 5/5/2016 200,000 199 6.25 % 4/15/2021 Series C 8/16/2016 100,000 100 5.875 % 1/15/2022 Series E 2/27/2018 5,000 495 5.700 % 4/15/2023 Series F 5/27/2020 5,000 494 5.625 % 7/15/2030 Total 745,500 $ 1,697 Series B, D, and C of preferred stock has a liquidation value and redemption price per share of $1,000, plus any declared and unpaid dividends. Series E and F stock has a liquidation value and redemption price per share of $100,000 , plus any declared and unpaid dividends. All preferred stock has no stated maturity and redemption is solely at the option of the Company. Under current rules, any redemption of the preferred stock is subject to prior approval of the FRB. Preferred F Stock issued and outstanding During the 2020 second quarter, Huntington issued $500 million of preferred stock. Huntington issued 500,000 depositary shares, each depositary shares representing a 1/100th ownership interest in a share of 5.625% Series F Non-Cumulative Perpetual Preferred Stock (Series F Preferred Stock), par value $0.01 per share, with a liquidation preference of $100,000 per share (equivalent to $1,000 per depositary share). Each holder of a depositary share will be entitled to all proportional rights and preferences of the Series F Preferred Stock (including dividend, voting, redemption, and liquidation rights). Costs of $6 million related to the issuance of the Series F Preferred Stock are reported as a direct deduction from the face amount of the stock. Dividends on the Series F Preferred Stock will be non-cumulative and payable quarterly in arrears, when, as and if authorized by the Company's board of directors or a duly authorized committee of the board and declared by the Company, at an annual rate of 5.625% per year on the liquidation preference of $100,000 per share, equivalent to $1,000 per depositary share. The dividend payment dates will be the fifteenth day of each January, April, July and October, commencing on October 15, 2020.

EARNINGS PER SHARE

EARNINGS PER SHARE	6 Months Ended
EARNINGS PER SHARE	Jun. 30, 2020
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 calculation of basic and diluted earnings per share for the three-month and six-month periods ended June 30, 2020 and 2019 was as follows: Three Months Ended Six Months Ended (dollar amounts in millions, except per share data, share count in thousands) 2020 2019 2020 2019 Basic earnings per common share: Net income $ 150 $ 364 $ 198 $ 722 Preferred stock dividends (19 ) (18 ) (37 ) (37 ) Net income available to common shareholders $ 131 $ 346 $ 161 $ 685 Average common shares issued and outstanding 1,016,259 1,044,802 1,016,951 1,045,899 Basic earnings per common share $ 0.13 $ 0.33 $ 0.16 $ 0.66 Diluted earnings per common share: Dilutive potential common shares: Stock options and restricted stock units and awards 7,516 11,308 9,939 13,057 Shares held in deferred compensation plans 4,908 4,170 4,739 4,003 Dilutive potential common shares 12,424 15,478 14,678 17,060 Total diluted average common shares issued and outstanding 1,028,683 1,060,280 1,031,629 1,062,959 Diluted earnings per common share $ 0.13 $ 0.33 $ 0.16 $ 0.64 Anti-dilutive awards (1) 17,200 7,656 12,291 6,237 (1) Reflects the total number of shares related to outstanding options that have been excluded from the computation of diluted earnings per share because the impact would have been anti-dilutive.

NONINTEREST INCOME

NONINTEREST INCOME	6 Months Ended
NONINTEREST INCOME	Jun. 30, 2020
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 June 30, Six Months Ended June 30, Noninterest income 2020 2019 2020 2019 Noninterest income from contracts with customers $ 201 $ 235 $ 428 $ 457 Noninterest income within the scope of other GAAP topics 190 139 324 236 Total noninterest income $ 391 $ 374 $ 752 $ 693 The following table illustrates the disaggregation by operating segment and major revenue stream and reconciles disaggregated revenue to segment revenue presented in Note 16 “ Segment Reporting ”. Three Months Ended June 30, 2020 (dollar amounts in millions) Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated Major Revenue Streams Service charges on deposit accounts $ 39 $ 18 $ 1 $ 1 $ — $ 59 Card and payment processing income 52 3 — — — 55 Trust and investment management services 10 1 — 34 — 45 Insurance income 12 1 — 11 1 25 Other noninterest income 4 5 — 7 1 17 Net revenue from contracts with customers $ 117 $ 28 $ 1 $ 53 $ 2 $ 201 Noninterest income within the scope of other GAAP topics 101 57 1 1 30 190 Total noninterest income $ 218 $ 85 $ 2 $ 54 $ 32 $ 391 Three Months Ended June 30, 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 $ 73 $ 16 $ 2 $ 1 $ — $ 92 Card and payment processing income 56 4 — — — 60 Trust and investment management services 8 1 — 34 — 43 Insurance income 9 1 — 12 1 23 Other noninterest income 8 5 1 1 2 17 Net revenue from contracts with customers $ 154 $ 27 $ 3 $ 48 $ 3 $ 235 Noninterest income within the scope of other GAAP topics 44 62 1 1 31 139 Total noninterest income $ 198 $ 89 $ 4 $ 49 $ 34 $ 374 Six Months Ended June 30, 2020 (dollar amounts in millions) Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated Major Revenue Streams Service charges on deposit accounts $ 107 $ 35 $ 2 $ 2 $ — $ 146 Card and payment processing income 104 7 — — — 111 Trust and investment management services 20 2 — 70 — 92 Insurance income 20 3 — 23 2 48 Other noninterest income 12 8 1 8 2 31 Net revenue from contracts with customers $ 263 $ 55 $ 3 $ 103 $ 4 $ 428 Noninterest income within the scope of other GAAP topics 167 115 2 2 38 324 Total noninterest income $ 430 $ 170 $ 5 $ 105 $ 42 $ 752 Six Months Ended June 30, 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 $ 142 $ 32 $ 3 $ 2 $ — $ 179 Card and payment processing income 106 7 — — — 113 Trust and investment management services 16 1 — 69 1 87 Insurance income 17 3 — 23 1 44 Other noninterest income 16 10 2 4 2 34 Net revenue from contracts with customers $ 297 $ 53 $ 5 $ 98 $ 4 $ 457 Noninterest income within the scope of other GAAP topics 75 112 1 2 46 236 Total noninterest income $ 372 $ 165 $ 6 $ 100 $ 50 $ 693 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 June 30, 2020 is expected to be earned within one year.

FAIR VALUES OF ASSETS AND LIABI

FAIR VALUES OF ASSETS AND LIABILITIES	6 Months Ended
FAIR VALUES OF ASSETS AND LIABILITIES	Jun. 30, 2020
Fair Value Disclosures [Abstract]
FAIR VALUES OF ASSETS AND LIABILITIES	FAIR VALUES OF ASSETS AND LIABILITIES See Note 18 “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, 2019 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 and six-month periods ended June 30, 2020 and 2019 . Assets and Liabilities measured at fair value on a recurring basis Assets and liabilities measured at fair value on a recurring basis at June 30, 2020 and December 31, 2019 are summarized below: Fair Value Measurements at Reporting Date Using Netting Adjustments (1) June 30, 2020 (dollar amounts in millions) Level 1 Level 2 Level 3 Assets Trading account securities: Municipal securities $ — $ 45 $ — $ — $ 45 Available-for-sale securities: U.S. Treasury securities 8 — — — 8 Residential CMOs — 5,118 — — 5,118 Residential MBS — 3,838 — — 3,838 Commercial MBS — 788 — — 788 Other agencies — 147 — — 147 Municipal securities — 55 3,102 — 3,157 Private-label CMO — — 5 — 5 Asset-backed securities — 155 56 — 211 Corporate debt — 21 — — 21 Other securities/sovereign debt — 4 — — 4 8 10,126 3,163 — 13,297 Other securities 56 — — — 56 Loans held for sale — 954 — — 954 Loans held for investment — 67 25 — 92 MSRs — — 172 — 172 Derivative assets — 2,278 43 (1,214 ) 1,107 Liabilities Derivative liabilities — 1,276 3 (1,107 ) 172 Fair Value Measurements at Reporting Date Using Netting Adjustments (1) December 31, 2019 (dollar amounts in millions) Level 1 Level 2 Level 3 Assets Trading account securities: Federal agencies: Other agencies $ — $ 4 $ — $ — $ 4 Municipal securities — 63 — — 63 Other securities 30 2 — — 32 30 69 — — 99 Available-for-sale securities: U.S. Treasury securities 10 — — — 10 Residential CMOs — 5,085 — — 5,085 Residential MBS — 4,222 — — 4,222 Commercial MBS — 976 — — 976 Other agencies — 165 — — 165 Municipal securities — 56 2,999 — 3,055 Private-label CMO — — 2 — 2 Asset-backed securities — 531 48 — 579 Corporate debt — 51 — — 51 Other securities/sovereign debt — 4 — — 4 10 11,090 3,049 — 14,149 Other securities 54 — — — 54 Loans held for sale — 781 — — 781 Loans held for investment — 55 26 — 81 MSRs — — 7 — 7 Derivative assets — 848 8 (404 ) 452 Liabilities Derivative liabilities — 519 2 (417 ) 104 (1) Amounts represent the impact of legally enforceable master netting agreements that allow the Company to settle positive and negative positions and cash collateral held or placed with the same counterparties. The tables below present a rollforward of the balance sheet amounts for the three-month and six-month periods ended June 30, 2020 and 2019 , for financial instruments measured on a recurring basis and classified as Level 3. The classification of an item as Level 3 is based on the significance of the unobservable inputs to the overall fair value measurement. However, Level 3 measurements may also include observable components of value that can be validated externally. Accordingly, the gains and losses in the table below include changes in fair value due in part to observable factors that are part of the valuation methodology. Level 3 Fair Value Measurements Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Private- label CMO Asset-backed securities Loans held for investment Opening balance $ 165 $ 39 $ 2,937 $ 2 $ 69 $ 26 Transfers out of Level 3 (1) — (55 ) — — — — Total gains/losses for the period: Included in earnings 7 56 — — — — Included in OCI — — 69 — — — Purchases/originations — — 264 3 — — Repayments — — — — — (1 ) Settlements — — (168 ) — (13 ) — Closing balance $ 172 $ 40 $ 3,102 $ 5 $ 56 $ 25 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ 7 $ — $ — $ — $ — $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period — — (20 ) — — — Level 3 Fair Value Measurements MSRs Derivative instruments Available-for-sale securities Loans held for investment (dollar amounts in millions) Municipal securities Opening balance $ 10 $ 5 $ 3,237 $ 29 Transfers out of Level 3 (1) — (15 ) — — Total gains/losses for the period: Included in earnings (1 ) 19 (1 ) — Included in OCI — — 3 — Purchases/originations — — 28 — Repayments — — — (1 ) Settlements — — (65 ) — Closing balance $ 9 $ 9 $ 3,202 $ 28 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (1 ) $ 4 $ — $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period $ — $ — 3 $ — Level 3 Fair Value Measurements Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Private- label CMO Asset-backed securities Loans held for investment Opening balance $ 7 $ 6 $ 2,999 $ 2 $ 48 $ 26 Fair value election for servicing assets previously measured using the amortized method 205 — — — — — Transfers out of Level 3 (1) — (75 ) — — — — Total gains/losses for the period: Included in earnings (40 ) 109 (1 ) — — — Included in OCI — — 1 — — — Purchases/originations — — 338 3 28 — Repayments — — — — — (1 ) Settlements — — (235 ) — (20 ) — Closing balance $ 172 $ 40 $ 3,102 $ 5 $ 56 $ 25 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (40 ) $ 34 $ — $ — $ — $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period — — 2 — — — Level 3 Fair Value Measurements Available-for-sale securities Loans held for investment (dollar amounts in millions) MSRs Derivative instruments Municipal securities Opening balance $ 10 $ 2 $ 3,165 $ 30 Transfers out of Level 3 (1) — (24 ) — — Total gains/losses for the period: Included in earnings (1 ) 31 — — Included in OCI — — 46 — Purchases/originations — — 108 — Repayments — — — (2 ) Settlements — — (117 ) — Closing balance $ 9 $ 9 $ 3,202 $ 28 Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date $ (1 ) $ 6 $ — $ — Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period — — 46 — (1) Transfers out of Level 3 represent the settlement value of the derivative instruments (i.e. interest rate lock agreements) that is transferred to loans held for sale, which is classified as Level 2. The tables below summarize the classification of gains and losses due to changes in fair value, recorded in earnings for Level 3 assets and liabilities for the three-month and six-month periods ended June 30, 2020 and 2019 : Level 3 Fair Value Measurements Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Classification of gains and losses in earnings: Mortgage banking income $ 7 $ 56 $ — Interest and fee income — — — Total $ 7 $ 56 $ — Level 3 Fair Value Measurements Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Classification of gains and losses in earnings: Mortgage banking income $ (1 ) $ 19 $ — Interest and fee income — — (1 ) Total $ (1 ) $ 19 $ (1 ) Level 3 Fair Value Measurements Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Classification of gains and losses in earnings: Mortgage banking income $ (40 ) $ 109 $ — Interest and fee income — — (1 ) Total $ (40 ) $ 109 $ (1 ) Level 3 Fair Value Measurements Available-for-sale securities (dollar amounts in millions) MSRs Derivative instruments Municipal securities Classification of gains and losses in earnings: Mortgage banking income $ (1 ) $ 31 $ — Interest and fee income — — — Total $ (1 ) $ 31 $ — Assets and liabilities under the fair value option The following tables present the fair value and aggregate principal balance of certain assets and liabilities under the fair value option: June 30, 2020 (dollar amounts in millions) Total Loans Loans that are 90 or more days past due Assets Fair value carrying amount Aggregate unpaid principal Difference Fair value carrying amount Aggregate unpaid principal Difference Loans held for sale $ 954 $ 906 $ 48 $ 1 $ 1 $ — Loans held for investment 92 97 (5 ) 4 4 — December 31, 2019 (dollar amounts in millions) Total Loans Loans that are 90 or more days past due Assets Fair value carrying amount Aggregate unpaid principal Difference Fair value carrying amount Aggregate unpaid principal Difference Loans held for sale $ 781 $ 755 $ 26 $ 2 $ 2 $ — Loans held for investment 81 87 (6 ) 3 4 (1 ) The following tables present the net gains (losses) from fair value changes for the three-month and six-month periods ended June 30, 2020 and 2019 . Net gains (losses) from fair value changes Net gains (losses) from fair value changes (dollar amounts in millions) Three Months Ended June 30, Six Months Ended June 30, Assets 2020 2019 2020 2019 Loans held for sale (1) $ 3 $ 8 $ 22 $ 6 (1) The net gains (losses) from fair value changes are included in Mortgage banking income on the Unaudited Condensed Consolidated Statements of Income. Assets 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 June 30, 2020 were as follows: Fair Value Measurements Using (dollar amounts in millions) Fair Value Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Total Collateral-dependent loans 116 — — 116 (38 ) Loans held for sale 76 — — 76 (45 ) Huntington records nonrecurring adjustments of collateral-dependent loans held for investment. 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 in the form of a charge-off. Loans held for sale are measured at lower of cost or fair value less costs to sell. The fair value of loans held for sale is based on binding or non-binding bids for the respective loans or similar loans. 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 June 30, 2020 and December 31, 2019 : Quantitative Information about Level 3 Fair Value Measurements at June 30, 2020 (1) (dollar amounts in millions) Fair Value Valuation Technique Significant Unobservable Input Range Weighted Average Measured at fair value on a recurring basis: MSRs $ 172 Discounted cash flow Constant prepayment rate 10 % - 26% 17 % Spread over forward interest rate swap rates 5 % - 11% 8 % Derivative assets 43 Consensus Pricing Net market price (3 )% - 14% 4 % Estimated Pull through % 4 % - 100% 88 % Municipal securities 3,102 Discounted cash flow Discount rate 2 % - 2% 2 % Asset-backed securities 56 Cumulative default 0 % - 39% 4 % Loss given default 5 % - 80% 24 % Measured at fair value on a nonrecurring basis: Collateral-dependent loans 116 Appraisal value NA NA (1) Certain disclosures related to quantitative level 3 fair value measurements do not include those deemed to be immaterial. Quantitative Information about Level 3 Fair Value Measurements at December 31, 2019 (1) (dollar amounts in millions) Fair Value Valuation Technique Significant Unobservable Input Range Weighted Average Measured at fair value on a recurring basis: MSRs $ 7 Discounted cash flow Constant prepayment rate — % - 26% 8 % Spread over forward interest rate swap rates 5 % - 11% 8 % Derivative assets 8 Consensus Pricing Net market price (2 )% - 11% 2 % Estimated Pull through % 2 % - 100% 91 % Municipal securities 2,999 Discounted cash flow Discount rate 2 % - 3% 2 % Asset-backed securities 48 Cumulative default — % - 39% 4 % Loss given default 5 % - 80% 24 % Measured at fair value on a nonrecurring basis: MSRs 206 Discounted cash flow Constant prepayment rate 10 % - 31% 12 % Spread over forward interest rate swap rates 5 % - 11% 9 % Impaired loans 26 Appraisal value NA NA (1) Certain disclosures related to quantitative level 3 fair value measurements do not include those deemed to be immaterial. 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. 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 June 30, 2020 and December 31, 2019 : June 30, 2020 (dollar amounts in millions) Amortized Cost Lower of Cost or Market Fair Value or Fair Value Option Total Carrying Amount Estimated Fair Value Financial Assets Cash and short-term assets $ 6,375 $ — $ — $ 6,375 $ 6,375 Trading account securities — — 45 45 45 Available-for-sale securities — — 13,297 13,297 13,297 Held-to-maturity securities 9,416 — — 9,416 9,856 Other securities 382 — 56 438 438 Loans held for sale — 211 954 1,165 1,167 Net loans and leases (1) 78,345 — 92 78,437 79,502 Derivative assets — — 1,107 1,107 1,107 Financial Liabilities Deposits 93,691 — — 93,691 93,702 Short-term borrowings 146 — — 146 146 Long-term debt 9,753 — — 9,753 9,992 Derivative liabilities — — 172 172 172 December 31, 2019 (dollar amounts in millions) Amortized Cost Lower of Cost or Market Fair Value or Fair Value Option Total Carrying Amount Estimated Fair Value Financial Assets Cash and short-term assets $ 1,272 $ — $ — $ 1,272 $ 1,272 Trading account securities — — 99 99 99 Available-for-sale securities — — 14,149 14,149 14,149 Held-to-maturity securities 9,070 — — 9,070 9,186 Other securities 387 — 54 441 441 Loans held for sale — 96 781 877 879 Net loans and leases (1) 74,540 — 81 74,621 75,177 Derivative assets — — 452 452 452 Financial Liabilities Deposits 82,347 — — 82,347 82,344 Short-term borrowings 2,606 — — 2,606 2,606 Long-term debt 9,849 — — 9,849 10,075 Derivative liabilities — — 104 104 104 (1) Includes collateral-dependent loans. The following table presents the level in the fair value hierarchy for the estimated fair values at June 30, 2020 and December 31, 2019 : Estimated Fair Value Measurements at Reporting Date Using Netting Adjustments (1) June 30, 2020 (dollar amounts in millions) Level 1 Level 2 Level 3 Financial Assets Trading account securities $ — $ 45 $ — $ 45 Available-for-sale securities 8 10,126 3,163 13,297 Held-to-maturity securities — 9,856 — 9,856 Other securities (2) 56 — — 56 Loans held for sale — 954 213 1,167 Net loans and direct financing leases — 67 79,435 79,502 Derivative assets — 2,278 43 $ (1,214 ) 1,107 Financial Liabilities Deposits — 90,153 3,549 93,702 Short-term borrowings — — 146 146 Long-term debt — 9,374 618 9,992 Derivative liabilities — 1,276 3 (1,107 ) 172 Estimated Fair Value Measurements at Reporting Date Using Netting Adjustments (1) December 31, 2019 (dollar amounts in millions) Level 1 Level 2 Level 3 Financial Assets Trading account securities $ 30 $ 69 $ — $ 99 Available-for-sale securities 10 11,090 3,049 14,149 Held-to-maturity securities — 9,186 — 9,186 Other securities (2) 54 — — 54 Loans held for sale — 781 98 879 Net loans and direct financing leases — 55 75,122 75,177 Derivative assets — 848 8 $ (404 ) 452 Financial Liabilities Deposits — 76,790 5,554 82,344 Short-term borrowings — — 2,606 2,606 Long-term debt — 9,439 636 10,075 Derivative liabilities — 519 2 (417 ) 104 (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. (2) 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 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	6 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS	Jun. 30, 2020
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 the income statement line item where the gains and losses on the hedged item are recognized. Gains and losses on derivatives that are not designated in an effective hedge relationship under GAAP immediately impact earnings within the period they occur. The following table presents the fair values and notional values of all derivative instruments included in the Unaudited Condensed Consolidated Balance Sheets at June 30, 2020 and December 31, 2019 . Amounts in the table below are presented gross without the impact of any net collateral arrangements. June 30, 2020 December 31, 2019 (dollar amounts in millions) Notional Value Asset Liability Notional Value Asset Liability Derivatives designated as Hedging Instruments Interest rate contracts $ 28,819 $ 975 $ 86 $ 25,927 $ 256 $ 36 Derivatives not designated as Hedging Instruments Interest rate contracts 32,025 1,122 951 27,614 420 314 Foreign exchange contracts 2,093 27 27 2,173 19 18 Commodities contracts 2,278 197 193 3,020 155 152 Equity contracts 478 — 22 427 6 1 Total Contracts $ 65,693 $ 2,321 $ 1,279 $ 59,161 $ 856 $ 521 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 and six-month periods ended June 30, 2020 and 2019 , respectively. Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Interest rate contracts: Customer Capital markets fees $ 12 $ 12 $ 29 $ 22 Mortgage Banking Mortgage banking income 6 22 63 34 Interest Rate Floors Other noninterest income — 5 — 5 Foreign exchange contracts Capital markets fees 6 7 12 15 Commodities contracts Capital markets fees 1 2 3 (4 ) Equity contracts Other noninterest expense (1 ) — (3 ) (1 ) Total $ 24 $ 48 $ 104 $ 71 Derivatives used in asset and liability management activities Huntington engages in balance sheet hedging activity, principally for asset and liability management purposes. 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 hedge changes in fair value of outstanding fixed-rate debt and investment securities caused by fluctuations in market interest rates. Cash flow hedges are executed to modify interest rate characteristics of designated commercial loans in order to reduce the impact of changes in future cash flows due to market interest rate changes. The following table presents the gross notional values of derivatives used in Huntington’s asset and liability management activities at June 30, 2020 and December 31, 2019 , identified by the underlying interest rate-sensitive instruments. June 30, 2020 (dollar amounts in millions) Fair Value Hedges Cash Flow Hedges Total Instruments associated with: Loans $ — $ 18,375 $ 18,375 Investment securities 2,950 — 2,950 Long-term debt 7,494 — 7,494 Total notional value at June 30, 2020 $ 10,444 $ 18,375 $ 28,819 December 31, 2019 (dollar amounts in millions) Fair Value Hedges Cash Flow Hedges Total Instruments associated with: Loans $ — $ 18,375 $ 18,375 Investment securities — 12 12 Long-term debt 7,540 — 7,540 Total notional value at December 31, 2019 $ 7,540 $ 18,387 $ 25,927 These derivative financial instruments were entered into for the purpose of managing the interest rate risk of assets and liabilities. 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 $52 million and $(15) million for the three-month periods ended June 30, 2020 , and 2019 , respectively. For the six -month periods ended June 30, 2020 , and 2019 , the net amounts resulted in an increase (decrease) to net interest income of $68 million and $(29) million , 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. Huntington has designated $3.0 billion of interest rate swaps as fair value hedges of fixed-rate investment securities using the last-of-layer method. This approach allows the Company to designate as the hedged item a stated amount of the assets that are not expected to be affected by prepayments, defaults and other factors affecting the timing and amount of cash flows. The fair value basis adjustment on our hedged mortgage-backed securities is included in available-for-sale securities on our Unaudited Condensed Consolidated Statements of Financial Condition. 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 and six-month periods ended June 30, 2020 and 2019 . Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Interest rate contracts Change in fair value of interest rate swaps hedging investment securities (1) $ (1 ) $ — $ (1 ) $ — Change in fair value of hedged investment securities (1) 1 — 1 — Change in fair value of interest rate swaps hedging long-term debt (2) (5 ) 88 196 129 Change in fair value of hedged long term debt (2) (4 ) (88 ) (195 ) (129 ) (1) Recognized in Interest income—available-for-sale securities—taxable in the Unaudited Condensed Consolidated Statements of Income (2) Recognized in Interest expense—long-term debt in the Unaudited Condensed Consolidated Statements of Income . As of June 30, 2020 , and December 31, 2019 , the following amounts were recorded on the balance sheet related to cumulative basis adjustments for fair value hedges. Amortized Cost Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (dollar amounts in millions) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Investment securities (1) $ 7,573 $ — $ 1 $ — Long-term debt 7,242 7,578 309 114 Total $ 14,815 $ 7,578 $ 310 $ 114 (1) Amounts include the amortized cost basis of closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. As of June 30, 2020 , the amortized cost basis of the closed portfolios used in these hedging relationships was $7.6 billion , the cumulative basis adjustments associated with these hedging relationships was $1.0 million , and the amounts of the designated hedged items were $3.0 billion . The cumulative amount of fair value hedging adjustments remaining for any hedged assets and liabilities for which hedge accounting has been discontinued was $(76) million and $(93) million at June 30, 2020 and December 31, 2019 , respectively. Cash Flow Hedges At June 30, 2020 , Huntington has $18.4 billion of interest rate floors and swaps. These are designated as cash flow hedges for variable rate commercial loans indexed to LIBOR. The initial premium paid for the interest rate floor contracts represents the time value of the contracts and is not included in the measurement of hedge effectiveness. Any change in fair value related to time value is recognized in OCI. The initial premium paid is amortized on a straight line basis as a reduction to interest income over the contractual life of these contracts. Gains and losses on interest rate floors and swaps recognized in other comprehensive income were $11 million and $47 million for the three-months periods ended June 30, 2020 and 2019 , respectively. For the six-month periods ended June 30, 2020 and 2019 , gains and losses on interest rate floors and swaps recognized in other comprehensive income were $319 million and, $54 million respectively. Derivatives used in mortgage banking activities Mortgage loan origination hedging activity Huntington’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. Forward commitments to sell economically hedge the possible loss on interest rate lock commitments due to interest rate change. The net asset (liability) position of these derivatives at June 30, 2020 and December 31, 2019 are $31 million and $6 million , respectively. At June 30, 2020 and December 31, 2019 , Huntington had commitments to sell residential real estate loans of $2.3 billion and $1.4 billion , respectively. These contracts mature in less than one 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) June 30, 2020 December 31, 2019 Notional value $ 540 $ 778 Trading assets 69 19 Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Trading gains $ 6 $ 18 $ 63 $ 25 MSR hedging trading assets and liabilities are included in other assets and other liabilities, respectively, in the Unaudited Condensed Balance Sheets. 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 these 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 June 30, 2020 and December 31, 2019 , were $65 million and $87 million , respectively. The total notional values of derivative financial instruments used by Huntington on behalf of customers, including offsetting derivatives, were $32 billion and $30 billion at June 30, 2020 and December 31, 2019 , respectively. Huntington’s credit risk from customer derivatives was $1.0 billion and $407 million at the same dates, respectively. 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 12 “ 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. In addition to the customer derivative credit exposure, aggregate credit risk associated with broker-dealer and bank derivative transactions, net of collateral that has been pledged by the counterparty, was $92 million and $22 million at June 30, 2020 and December 31, 2019 , respectively. The credit risk associated with derivatives is calculated after considering master netting agreements. At June 30, 2020 , Huntington pledged $231 million of investment securities and cash collateral to counterparties, while other counterparties pledged $441 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 June 30, 2020 and December 31, 2019 . 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 June 30, 2020 Derivatives $ 2,321 $ (1,214 ) $ 1,107 $ (129 ) $ (59 ) $ 919 December 31, 2019 Derivatives 856 (404 ) 452 (65 ) (29 ) 358 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 delivered Net amount June 30, 2020 Derivatives $ 1,279 $ (1,107 ) $ 172 $ (40 ) $ (28 ) $ 104 December 31, 2019 Derivatives 521 (417 ) 104 — (75 ) 29

VIEs

VIEs	6 Months Ended
VIEs	Jun. 30, 2020
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 June 30, 2020 , and December 31, 2019 : June 30, 2020 (dollar amounts in millions) Total Assets Total Liabilities Maximum Exposure to Loss Trust Preferred Securities $ 14 $ 252 $ — Affordable Housing Tax Credit Partnerships 858 432 858 Other Investments 220 59 220 Total $ 1,092 $ 743 $ 1,078 December 31, 2019 (dollar amounts in millions) Total Assets Total Liabilities Maximum Exposure to Loss Trust Preferred Securities $ 14 $ 252 $ — Affordable Housing Tax Credit Partnerships 727 332 727 Other Investments 179 63 179 Total $ 920 $ 647 $ 906 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 June 30, 2020 follows: (dollar amounts in millions) Rate Principal amount of subordinated note/ debenture issued to trust (1) Investment in unconsolidated subsidiary Huntington Capital I 1.00 % (2) $ 70 $ 6 Huntington Capital II 0.93 (3) 32 3 Sky Financial Capital Trust III 1.70 (4) 72 2 Sky Financial Capital Trust IV 1.70 (4) 74 2 Camco Financial Trust 1.63 (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 June 30, 2020 , based on three-month LIBOR + 0.70% . (3) Variable effective rate at June 30, 2020 , based on three-month LIBOR + 0.625% . (4) Variable effective rate at June 30, 2020 , based on three-month LIBOR + 1.40% . (5) Variable effective rate at June 30, 2020 , 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 June 30, 2020 and December 31, 2019 . (dollar amounts in millions) June 30, December 31, Affordable housing tax credit investments $ 1,423 $ 1,242 Less: amortization (565 ) (515 ) Net affordable housing tax credit investments $ 858 $ 727 Unfunded commitments $ 432 $ 332 The following table presents other information relating to Huntington’s affordable housing tax credit investments for the three-month and six-month periods ended June 30, 2020 and 2019 . Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Tax credits and other tax benefits recognized $ 30 $ 26 $ 59 $ 53 Proportional amortization expense included in provision for income taxes 25 22 50 44 There were no sales of affordable housing tax credit investments during the three-month and six-month periods ended June 30, 2020 and 2019 . There was no impairment recognized for the three-month and six-month periods ended June 30, 2020 and 2019 . Other VIE’s Other VIE’s include investments in Small Business Investment Companies, Historic Tax Credit Investments, certain equity method investments, renewable energy financings, automobile securitizations, and other miscellaneous investments.

COMMITMENTS AND CONTINGENT LIAB

COMMITMENTS AND CONTINGENT LIABILITIES	6 Months Ended
COMMITMENTS AND CONTINGENT LIABILITIES	Jun. 30, 2020
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 June 30, 2020 and December 31, 2019 , were as follows: (dollar amounts in millions) June 30, December 31, Contract amount representing credit risk Commitments to extend credit: Commercial $ 20,283 $ 18,326 Consumer 14,735 14,831 Commercial real estate 1,261 1,364 Standby letters of credit 591 587 Commercial letters of credit 20 8 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. The interest rate risk arising from these financial instruments is insignificant as a result of their predominantly short-term, variable-rate nature. 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 $5 million and $8 million at June 30, 2020 and December 31, 2019 , 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 21 - Commitments and Contingencies to the Consolidated Financial Statements of the Corporation’s 2019 Annual Report on Form 10-K and Note 14 - Commitments and Contingencies to the Consolidated Financial Statements of the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2020 (collectively, the prior commitments and contingencies disclosures). 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 $20 million at June 30, 2020 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, 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	6 Months Ended
SEGMENT REPORTING	Jun. 30, 2020
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. For a description of our business segments, see Note 24 - Segment Reporting to the Consolidated Financial Statements of the Corporation’s 2019 Annual Report on Form 10-K. 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. 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). Listed in the table below is certain operating basis financial information reconciled to Huntington’s June 30, 2020 , December 31, 2019 , and June 30, 2019 , reported results by business segment. Three Months Ended June 30, Income Statements Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated (dollar amounts in millions) 2020 Net interest income $ 368 $ 240 $ 100 $ 40 $ 44 $ 792 Provision (benefit) for credit losses 31 226 70 — — 327 Noninterest income 218 85 2 54 32 391 Noninterest expense 422 136 34 62 21 675 Provision (benefit) for income taxes 27 (7 ) — 6 5 31 Net income (loss) $ 106 $ (30 ) $ (2 ) $ 26 $ 50 $ 150 2019 Net interest income $ 464 $ 264 $ 96 $ 52 $ (64 ) $ 812 Provision (benefit) for credit losses 30 24 5 — — 59 Noninterest income 198 89 4 49 34 374 Noninterest expense 427 145 38 67 23 700 Provision (benefit) for income taxes 43 39 12 7 (38 ) 63 Net income (loss) $ 162 $ 145 $ 45 $ 27 $ (15 ) $ 364 Six Months Ended June 30, Income Statements Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated (dollar amounts in millions) 2020 Net interest income $ 733 $ 472 $ 206 $ 83 $ 88 $ 1,582 Provision (benefit) for credit losses 114 523 131 — — 768 Noninterest income 430 170 5 105 42 752 Noninterest expense 840 265 69 124 29 1,327 Provision (benefit) for income taxes 44 (31 ) 2 14 12 41 Net income (loss) $ 165 $ (115 ) $ 9 $ 50 $ 89 $ 198 2019 Net interest income $ 936 $ 536 $ 191 $ 104 $ (133 ) $ 1,634 Provision (benefit) for credit losses 48 67 14 (3 ) — 126 Noninterest income 372 165 6 100 50 693 Noninterest expense 827 288 75 130 33 1,353 Provision (benefit) for income taxes 91 73 23 16 (77 ) 126 Net income (loss) $ 342 $ 273 $ 85 $ 61 $ (39 ) $ 722 Assets at Deposits at (dollar amounts in millions) June 30, December 31, June 30, December 31, Consumer & Business Banking $ 30,697 $ 25,073 $ 59,202 $ 51,675 Commercial Banking 35,323 34,337 22,041 20,762 Vehicle Finance 19,137 20,155 824 376 RBHPCG 6,855 6,665 6,834 6,370 Treasury / Other 26,413 22,772 4,790 3,164 Total $ 118,425 $ 109,002 $ 93,691 $ 82,347

ACCOUNTING STANDARDS UPDATE (Po

ACCOUNTING STANDARDS UPDATE (Policies)	6 Months Ended
ACCOUNTING STANDARDS UPDATE (Policies)	Jun. 30, 2020
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Credit Loss, Financial Instrument [Policy Text Block]	The allowance for credit losses is deducted from the amortized cost basis of a financial asset or a group of financial assets so that the balance sheet reflects the net amount Huntington expects to collect. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts, fair value hedge accounting adjustments, and deferred fees and costs. Subsequent changes (favorable and unfavorable) in expected credit losses are recognized immediately in net income as a credit loss expense or a reversal of credit loss expense. Management estimates the allowance by projecting probability-of-default, loss-given-default and exposure-at-default depending on economic parameters for each month of the remaining contractual term. Those economic parameters are developed using available information relating to past events, current conditions, and reasonable and supportable forecasts. Huntington’s reasonable and supportable forecast period reverts to a historical norm based on inputs within approximately two to three years. The reversion period is dependent on the state of the economy at the beginning of the forecast. Historical credit experience provides the basis for the estimation of expected credit losses, with adjustments made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency levels and terms, as well as for changes in the micro- and macro-economic environments. The contractual terms of financial assets are adjusted for expected prepayments and any extensions outside of Huntington’s control. Loans that are determined to have unique risk characteristics are evaluated on an individual basis by management. If a loan is determined to be collateral dependent, or meets the criteria to apply the collateral dependent practical expedient, expected credit losses are determined based on the fair value of the collateral at the reporting date, less costs to sell as appropriate. Loans with unique risk characteristics that are not subject to collateral dependent accounting, are assessed using a discounted cash flows methodology. The allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist. Management believes the products within each of the entity’s portfolio classes exhibit similar risk characteristics. Huntington has identified its portfolio classes as disclosed above.
ACCOUNTING STANDARDS UPDATE	ACCOUNTING STANDARDS UPDATE Accounting standards adopted in current period 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 framework with an expected credit loss model. - Requires those financial assets subject to the new guidance 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 collectability of the reported amount. - The guidance will require additional quantitative and qualitative disclosures related to the credit risk inherent in Huntington’s portfolio and how management monitors the portfolio’s credit quality. - Management adopted the guidance on January 1, 2020 through a cumulative-effect adjustment to retained earnings and implemented changes to relevant systems, processes, and controls where necessary. - The adoption of ASU 2016-13 on January 1, 2020 resulted in an increase to our total ACL of $393 million. This represented an increase of 44% from the 2019 year end ACL level of $887 million. For more detail on the day 1 adoption impacts, please refer to Note 5 - Allowance for Credit Losses. - The ASU eliminated 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 did not have any loans accounted for as PCD upon adoption. - At adoption, Huntington did not record an allowance with respect to HTM securities as the portfolio consists almost entirely of agency-backed securities that inherently have minimal nonpayment risk. ASU 2019-04 - Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments Issued: April 2019 - Clarifies various implementation issues related to Recognition and Measurement of Financial Instruments (ASC Topic 825), Current Expected Credit Losses (ASC Topic 326) and Derivatives and Hedging (ASC Topic 815). - Provides additional implementation guidance on CECL issues that include, among others, (a) measurement of credit allowance on accrued interest; (b) treatment of credit allowance upon transfers between classifications or categories for loans and debt securities; (c) inclusion of recoveries in determining credit allowance amounts; (d) using projections of rate change for variable rate instruments; (e) vintage disclosures for lines-of-credit; (f) contractual extensions and renewals; (g) consideration of prepayments in calculating effective interest rate; and (h) consideration of costs to sell if the entity intends to sell the collateral when foreclosure is probable. - Clarifies for Topic 815, among others, that (a) only interest rate risk may be hedged in a partial-term fair value hedge; (b) amortization of fair value basis adjustment may begin before the fair value hedge is discontinued; (c) hedged AFS securities should be disclosed at amortized cost for disclosures related to hedged assets; and (d) contractually specified interest rate should be considered when applying hypothetical derivative method while assessing hedge effectiveness. - Clarifies among others, that (a) using observable price under measurement alternative provided by ASC Topic 321 is a non-recurring fair value measurement and entities should adhere to non-recurring fair value disclosure requirements of Topic 820; and (b) equity securities without readily determinable fair value accounted for under measurement alternative should be remeasured using historical exchange rates. - Management adopted the amendments on January 1, 2020. - The ASU did not have a material impact on Huntington’s Unaudited Condensed Consolidated Financial Statements. Standard Summary of guidance Effects on financial statements ASU 2019-05 - Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief Issued: May 2019 - Provides entities that have certain instruments within the scope of ASC Subtopic 326-20 with an option to irrevocably elect fair value option, applied on instrument-by-instrument basis. The fair value option does not apply to held-to-maturity debt securities. - Management did not elect this option on any eligible instruments when adopting Topic 326 on January 1, 2020. - The ASU did not impact Huntington’s Unaudited Condensed Consolidated Financial Statements. ASU 2019-08 - Compensation - Codification Improvements - Share-based Consideration Payable to a Customer Issued: November 2019 - The ASU requires that an entity measure and classify share-based payment awards granted to a customer by applying the guidance in Topic 718. - The amount of share-based payment awards should be recorded as a reduction of the transaction price and is required to be measured on the basis of grant-date fair value of the share-based payment awards in accordance with Topic 718. - The classification and subsequent measurement of the award are subject to the guidance in Topic 718 unless the share-based payment award is subsequently modified and the grantee is no longer a customer. - Management adopted the amendments on January 1, 2020. - The ASU did not have a material impact on Huntington’s Unaudited Condensed Consolidated Financial Statements. ASU 2019-11 - Financial Instruments - Credit Losses (Topic 326): Codification Improvements to Topic 326 Issued: November 2019 - The ASU clarifies or addresses stakeholders’ specific issues related to ASU 2016-13 as described below: - Clarifies that the allowance for purchased financial assets with credit deterioration should include expected recoveries. If a method other than a discounted cash flow method is used to calculate allowance, expected recoveries should not result in an acceleration of the noncredit discount. - Provides transition relief by permitting entities an accounting policy election to adjust the effective interest rate on existing TDRs using prepayment assumptions on the date of adoption of Topic 326 rather than the prepayment assumptions in effect immediately before the restructuring. - Extends the disclosure relief for accrued interest receivable balances to additional relevant disclosures involving amortized cost basis. - Clarifies that an entity should assess whether it reasonably expects the borrower will be able to continually replenish collateral securing the financial asset to apply the practical expedient related to collateral maintenance provision. - Management adopted the amendments on January 1, 2020. - The ASU 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 2019-12 - Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes Issued: December 2019 - The ASU simplifies the accounting for income taxes by removing exceptions to the: (a) Incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items; (b) Requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment; (c) Ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary; and (d) General methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. - The ASU also simplifies various other aspects of the accounting for income taxes. - The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. - Early adoption of the ASU is permitted, including adoption in any interim period for which financial statements have not yet been issued. An entity that elects to early adopt in an interim period should reflect any adjustments as of the beginning of the annual period that includes that interim period. - The ASU is not expected to have a material impact on Huntington’s Unaudited Condensed Consolidated Financial Statements. ASU 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting Issued: March 2020 - The ASU provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met, including the following: - Modifications of contracts within the scope of Topics 310, Receivables, and 470, Debt, should be accounted for by prospectively adjusting the effective interest rate. - Modifications of contracts within the scope of Topic 842, Leases, should be accounted for as a continuation of the existing contracts with no reassessments of the lease classification and the discount rate. - Modifications of contracts do not require an entity to reassess its original conclusion about whether that contract contains an embedded derivative that is clearly and closely related to the economic characteristics and risks of the host contract under Topic 815. - The ASU also provides optional expedients for various hedging relationships and do not require de-designation of hedging relationships if certain criteria are met. - An entity may make a one time election to sell, transfer, or both sell and transfer debt securities classified as held to maturity that reference a rate affected by reference rate reform and that are classified as held to maturity before January 1, 2020. - The ASU is effective for all entities from the beginning of an interim period that includes or is subsequent to March 12, 2020 through December 31, 2022. - The ASU is not expected to have a material impact Huntington’s Unaudited Condensed Consolidated Financial Statements.

INVESTMENT SECURITIES AND OTH_2

INVESTMENT SECURITIES AND OTHER SECURITIES (Tables)	6 Months Ended
INVESTMENT SECURITIES AND OTHER SECURITIES (Tables)	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
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 June 30, 2020 and December 31, 2019 : Unrealized (dollar amounts in millions) Amortized Cost Gross Gains Gross Losses Fair Value June 30, 2020 Available-for-sale securities: U.S. Treasury $ 8 $ — $ — $ 8 Federal agencies: Residential CMO 4,933 185 — 5,118 Residential MBS 3,718 120 — 3,838 Commercial MBS 764 24 — 788 Other agencies 144 3 — 147 Total U.S. Treasury, federal agency and other agency securities 9,567 332 — 9,899 Municipal securities 3,145 47 (35 ) 3,157 Private-label CMO 5 — — 5 Asset-backed securities 208 3 — 211 Corporate debt 22 — (1 ) 21 Other securities/Sovereign debt 4 — — 4 Total available-for-sale securities $ 12,951 $ 382 $ (36 ) $ 13,297 Held-to-maturity securities: Federal agencies: Residential CMO $ 2,151 $ 106 $ — $ 2,257 Residential MBS 3,361 120 — 3,481 Commercial MBS 3,631 202 — 3,833 Other agencies 269 12 — 281 Total federal agency and other agency securities 9,412 440 — 9,852 Municipal securities 4 — — 4 Total held-to-maturity securities $ 9,416 $ 440 $ — $ 9,856 Other securities, at cost: Non-marketable equity securities: Federal Home Loan Bank stock $ 84 $ — $ — $ 84 Federal Reserve Bank stock 298 — — 298 Other securities, at fair value Mutual funds 52 — — 52 Marketable equity securities 3 1 — 4 Total other securities $ 437 $ 1 $ — $ 438 Unrealized (dollar amounts in millions) Amortized Gross Gross Fair Value December 31, 2019 Available-for-sale securities: U.S. Treasury $ 10 $ — $ — $ 10 Federal agencies: Residential CMO 5,055 48 (18 ) 5,085 Residential MBS 4,180 45 (3 ) 4,222 Commercial MBS 979 1 (4 ) 976 Other agencies 165 1 (1 ) 165 Total U.S. Treasury, federal agency and other agency securities 10,389 95 (26 ) 10,458 Municipal securities 3,044 34 (23 ) 3,055 Private-label CMO 2 — — 2 Asset-backed securities 575 6 (2 ) 579 Corporate debt 49 2 — 51 Other securities/Sovereign debt 4 — — 4 Total available-for-sale securities $ 14,063 $ 137 $ (51 ) $ 14,149 Held-to-maturity securities: Federal agencies: Residential CMO $ 2,351 $ 33 $ (3 ) $ 2,381 Residential MBS 2,463 50 — 2,513 Commercial MBS 3,959 34 — 3,993 Other agencies 293 2 — 295 Total federal agency and other agency securities 9,066 119 (3 ) 9,182 Municipal securities 4 — — 4 Total held-to-maturity securities $ 9,070 $ 119 $ (3 ) $ 9,186 Other securities, at cost: Non-marketable equity securities: Federal Home Loan Bank stock $ 90 $ — $ — $ 90 Federal Reserve Bank stock 297 — — 297 Other securities, at fair value Mutual funds 53 — — 53 Marketable equity securities 1 — — 1 Total other securities $ 441 $ — $ — $ 441
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 June 30, 2020 and December 31, 2019 . Expected maturities may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without incurring penalties. June 30, 2020 December 31, 2019 (dollar amounts in millions) Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities: Under 1 year $ 344 $ 337 $ 231 $ 229 After 1 year through 5 years 1,166 1,159 1,196 1,189 After 5 years through 10 years 1,410 1,421 1,594 1,606 After 10 years 10,031 10,380 11,042 11,125 Total available-for-sale securities $ 12,951 $ 13,297 $ 14,063 $ 14,149 Held-to-maturity securities: Under 1 year $ — $ — $ — $ — After 1 year through 5 years 141 149 17 17 After 5 years through 10 years 181 190 300 305 After 10 years 9,094 9,517 8,753 8,864 Total held-to-maturity securities $ 9,416 $ 9,856 $ 9,070 $ 9,186
Schedule of Unrealized Loss on Investments [Table Text Block]	June 30, 2020 December 31, 2019 (dollar amounts in millions) Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities: Under 1 year $ 344 $ 337 $ 231 $ 229 After 1 year through 5 years 1,166 1,159 1,196 1,189 After 5 years through 10 years 1,410 1,421 1,594 1,606 After 10 years 10,031 10,380 11,042 11,125 Total available-for-sale securities $ 12,951 $ 13,297 $ 14,063 $ 14,149 Held-to-maturity securities: Under 1 year $ — $ — $ — $ — After 1 year through 5 years 141 149 17 17 After 5 years through 10 years 181 190 300 305 After 10 years 9,094 9,517 8,753 8,864 Total held-to-maturity securities $ 9,416 $ 9,856 $ 9,070 $ 9,186 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 June 30, 2020 and December 31, 2019 : Less than 12 Months Over 12 Months Total (dollar amounts in millions) Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized June 30, 2020 Available-for-sale securities: Federal agencies: Residential CMO $ 74 $ — $ — $ — $ 74 $ — Residential MBS — — — — — Commercial MBS — — — — — — Other agencies — — — — — — Total federal agency and other agency securities 74 — — — 74 — Municipal securities 428 (8 ) 1,023 (27 ) 1,451 (35 ) Asset-backed securities 26 — 56 — 82 — Corporate debt 13 (1 ) — — 13 (1 ) Total temporarily impaired securities $ 541 $ (9 ) $ 1,079 $ (27 ) $ 1,620 $ (36 ) Held-to-maturity securities: Federal agencies: Residential CMO $ — $ — $ — $ — $ — $ — Residential MBS — — — — — — Commercial MBS — — — — — — Other agencies — — — — — — Total federal agency and other agency securities — — — — — — Municipal securities — — — — — — Total temporarily impaired securities $ — $ — $ — $ — $ — $ — Less than 12 Months Over 12 Months Total (dollar amounts in millions) Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized December 31, 2019 Available-for-sale securities: Federal agencies: Residential CMO $ 1,206 $ (10 ) $ 519 $ (8 ) $ 1,725 $ (18 ) Residential MBS 1,169 (3 ) 9 — 1,178 (3 ) Commercial MBS 472 (2 ) 272 (2 ) 744 (4 ) Other agencies 86 (1 ) — — 86 (1 ) Total federal agency and other agency securities 2,933 (16 ) 800 (10 ) 3,733 (26 ) Municipal securities 273 (4 ) 1,204 (19 ) 1,477 (23 ) Asset-backed securities 116 (1 ) 37 (1 ) 153 (2 ) Corporate debt 1 — — — 1 — Total temporarily impaired securities $ 3,323 $ (21 ) $ 2,041 $ (30 ) $ 5,364 $ (51 ) Held-to-maturity securities: Federal agencies: Residential CMO $ 218 $ (1 ) $ 112 $ (2 ) $ 330 $ (3 ) Residential MBS 317 — — — 317 — Commercial MBS 81 — — — 81 — Other agencies 58 — — — 58 — Total federal agency and other agency securities 674 (1 ) 112 (2 ) 786 (3 ) Municipal securities 4 — — — 4 — Total temporarily impaired securities $ 678 $ (1 ) $ 112 $ (2 ) $ 790 $ (3 )

LOANS AND LEASES (Tables)

LOANS AND LEASES (Tables)	6 Months Ended
LOANS AND LEASES (Tables)	Jun. 30, 2020
Receivables [Abstract]
Loan and Lease Portfolio	The following table provides a detailed listing of Huntington’s loan and lease portfolio at June 30, 2020 and December 31, 2019 . (dollar amounts in millions) June 30, 2020 December 31, 2019 Loans and leases: Commercial and industrial $ 34,879 $ 30,664 Commercial real estate 7,179 6,674 Automobile 12,678 12,797 Home equity 8,866 9,093 Residential mortgage 11,621 11,376 RV and marine 3,843 3,563 Other consumer 1,073 1,237 Loans and leases $ 80,139 $ 75,404 Allowance for loan and lease losses (1,702 ) (783 ) Net loans and leases $ 78,437 $ 74,621
Direct Financing Lease, Lease Income	The following table presents net investments in lease financing receivables by category at June 30, 2020 and December 31, 2019 . (dollar amounts in millions) June 30, December 31, Commercial and industrial: Lease payments receivable $ 1,762 $ 1,841 Estimated residual value of leased assets 691 728 Gross investment in commercial and industrial lease financing receivables 2,453 2,569 Deferred origination costs 19 19 Deferred fees (214 ) (249 ) Total net investment in commercial and industrial lease financing receivables $ 2,258 $ 2,339 The carrying value of residual values guaranteed was $96 million and $95 million as of June 30, 2020 and December 31, 2019 , respectively. The future lease rental payments due from customers on sales-type and direct financing leases at June 30, 2020 , totaled $1.8 billion and were due as follows: $0.6 billion in 2021 , $0.5 billion in 2022 , $0.3 billion in 2023 , $0.2 billion in 2024 , $0.1 billion in 2025 , and $0.1 billion thereafter. Interest income recognized for these types of leases was $28 million and $27 million for the three-month periods ended June 30, 2020 and 2019 , respectively. For the six-month periods ended June 30, 2020 and 2019 , interest income recognized was $55 million and $53 million , respectively.
NALs and Past Due Loans	The following table presents NALs by loan class at June 30, 2020 and December 31, 2019 (1): June 30, 2020 December 31, 2019 (dollar amounts in millions) Nonaccrual loans with no ACL Total nonaccrual loans Nonaccrual loans with no ACL Total nonaccrual loans Commercial and industrial $ 97 $ 485 $ 109 $ 323 Commercial real estate 6 28 2 10 Automobile — 8 — 4 Home equity — 59 — 59 Residential mortgage — 66 — 71 RV and marine — 2 — 1 Other consumer — — — — Total nonaccrual loans $ 103 $ 648 $ 111 $ 468
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 June 30, 2020 and December 31, 2019 : June 30, 2020 Past Due (1)(2) Loans Accounted for Under FVO Total Loans 90 or (dollar amounts in millions) 30-59 60-89 90 or Total Current Commercial and industrial $ 46 $ 24 $ 87 $ 157 $ 34,722 $ — $ 34,879 $ 13 (3) Commercial real estate 3 21 4 28 7,151 — 7,179 — Automobile 47 14 14 75 12,603 — 12,678 8 Home equity 26 12 48 86 8,779 1 8,866 10 Residential mortgage 75 24 194 293 11,237 91 11,621 158 (4) RV and marine 8 3 3 14 3,829 — 3,843 2 Other consumer 6 2 3 11 1,062 — 1,073 3 Total loans and leases $ 211 $ 100 $ 353 $ 664 $ 79,383 $ 92 $ 80,139 $ 194 December 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 $ 65 $ 31 $ 69 $ 165 $ 30,499 $ — $ 30,664 $ 11 (3) Commercial real estate 3 1 7 11 6,663 — 6,674 — Automobile 95 19 11 125 12,672 — 12,797 8 Home equity 50 19 51 120 8,972 1 9,093 14 Residential mortgage 103 49 170 322 10,974 80 11,376 129 (4) RV and marine 13 4 2 19 3,544 — 3,563 2 Other consumer 13 6 7 26 1,211 — 1,237 7 Total loans and leases $ 342 $ 129 $ 317 $ 788 $ 74,535 $ 81 $ 75,404 $ 171 (1) NALs are included in this aging analysis based on the loan’s past due status. (2) At June 30, 2020, the principal balance of loans in payment deferral programs offered in response to the COVID-19 pandemic which are performing according to their modified terms are generally not considered delinquent. (3) Amounts include Huntington Technology Finance administrative lease delinquencies. (4)
Loan and lease balances by credit quality indicator	The following table presents each loan and lease class by vintage and credit quality indicator at June 30, 2020 : As of June 30, 2020 Term Loans Amortized Cost Basis by Origination Year Revolver Total at Amortized Cost Basis Revolver Total Converted to Term Loans (dollar amounts in millions) 2020 2019 2018 2017 2016 Prior Total (3) Commercial and industrial Credit Quality Indicator (1): Pass $ 9,667 $ 5,916 $ 3,675 $ 1,937 $ 1,236 $ 1,369 $ 8,112 $ 3 $ 31,915 OLEM 348 118 146 59 77 33 268 — 1,049 Substandard 241 187 279 194 91 204 711 — 1,907 Doubtful 2 — 5 — — 1 — — 8 Total Commercial and industrial $ 10,258 $ 6,221 $ 4,105 $ 2,190 $ 1,404 $ 1,607 $ 9,091 $ 3 $ 34,879 Commercial real estate Credit Quality Indicator (1): Pass $ 1,023 $ 1,616 $ 1,287 $ 603 $ 610 $ 700 $ 720 $ — $ 6,559 OLEM 44 140 100 59 23 32 37 — 435 Substandard 19 30 11 37 56 20 10 — 183 Doubtful — — — — — 2 — — 2 Total Commercial real estate $ 1,086 $ 1,786 $ 1,398 $ 699 $ 689 $ 754 $ 767 $ — $ 7,179 Automobile Credit Quality Indicator (2): 750+ $ 1,389 $ 2,367 $ 1,442 $ 1,025 $ 449 $ 170 $ — $ — $ 6,842 650-749 921 1,752 1,011 551 247 100 — — 4,582 <650 125 391 327 226 118 67 — — 1,254 Total Automobile $ 2,435 $ 4,510 $ 2,780 $ 1,802 $ 814 $ 337 $ — $ — $ 12,678 Home equity Credit Quality Indicator (2): 750+ $ 236 $ 32 $ 36 $ 39 $ 110 $ 547 $ 4,511 $ 193 $ 5,704 650-749 38 12 10 14 31 198 2,130 189 2,622 <650 — 1 1 1 7 86 329 114 539 Total Home equity $ 274 $ 45 $ 47 $ 54 $ 148 $ 831 $ 6,970 $ 496 $ 8,865 Residential mortgage Credit Quality Indicator (2): 750+ $ 1,492 $ 1,664 $ 1,236 $ 1,384 $ 950 $ 1,608 $ — $ — $ 8,334 650-749 512 586 418 322 209 565 — — 2,612 <650 12 35 67 75 58 337 — — 584 Total Residential mortgage $ 2,016 $ 2,285 $ 1,721 $ 1,781 $ 1,217 $ 2,510 $ — $ — $ 11,530 RV and marine Credit Quality Indicator (2): 750+ $ 562 $ 585 $ 682 $ 386 $ 174 $ 300 $ — $ — $ 2,689 650-749 131 263 239 165 77 159 — — 1,034 <650 2 16 25 27 14 36 — — 120 Total RV and marine $ 695 $ 864 $ 946 $ 578 $ 265 $ 495 $ — $ — $ 3,843 Other consumer Credit Quality Indicator (2): 750+ $ 52 $ 69 $ 32 $ 11 $ 5 $ 10 $ 325 $ 2 $ 506 650-749 21 74 25 8 3 5 311 32 479 <650 1 11 4 2 1 1 30 38 88 Total Other consumer $ 74 $ 154 $ 61 $ 21 $ 9 $ 16 $ 666 $ 72 $ 1,073 (1) Consistent with the credit quality disclosures, indicators for the Commercial portfolio are based on internally defined categories of credit grades which are generally refreshed at least semi-annually. (2) Consistent with the credit quality disclosures, indicators for the Consumer portfolio are based on updated customer credit scores refreshed at least quarterly. (3) The total amount of accrued interest recorded for these loans at June 30, 2020, presented in Other assets within the Condensed Consolidated Balance Sheets, was $106 million and $127 million of commercial and consumer, respectively. The following table presents each loan and lease class by credit quality indicator at December 31, 2019 . December 31, 2019 (dollar amounts in millions) Credit Risk Profile by UCS Classification Commercial Pass OLEM Substandard Doubtful Total Commercial and industrial $ 28,477 $ 634 $ 1,551 $ 2 $ 30,664 Commercial real estate 6,487 98 88 1 6,674 Credit Risk Profile by FICO Score (1), (2) Consumer 750+ 650-749 <650 Total Automobile $ 6,759 $ 4,661 $ 1,377 $ 12,797 Home equity 5,763 2,772 557 9,092 Residential mortgage 7,976 2,742 578 11,296 RV and marine 2,391 1,053 119 3,563 Other consumer 546 571 120 1,237 (1) Excludes loans accounted for under the fair value option. (2) Reflects updated customer credit scores.
Detailed troubled debt restructuring information by class	on of TDRs. On March 22, 2020 and April 7, 2020, the federal bank regulatory agencies including the FRB and OCC released statements encouraging financial institutions to work prudently with borrowers that may be unable to meet their contractual obligations because of the effects of COVID-19. The statements go on to explain that, in consultation with the FASB staff, the federal bank regulatory agencies concluded that short-term modifications (e.g. six months) made on a good faith basis to borrowers who were current as of the implementation date of a relief program are not TDRs. Section 4013 of the CARES Act further addresses COVID-19 related modifications and specifies that COVID-19 related modifications on loans that were current as of December 31, 2019 are not TDRs. For COVID-19 related loan modifications which occurred from March 1, 2020 through June 30,2020, and met the loan modification criteria under the CARES Act, Huntington elected to suspend TDR accounting for such loan modifications. For loan modifications not eligible for the CARES Act, Huntington applied the interagency regulatory guidance that was clarified on April 7, 2020. Accordingly, insignificant concessions (related to the current COVID- 19 crisis) granted through payment deferrals, fee waivers, or other short-term modifications (generally 6 months or less) and provided to borrowers less than 30 days past due at March 17, 2020 were not be deemed to be TDRs. Therefore, modified loans that met the required guidelines for relief are excluded from the TDR disclosures below. 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 and six-month periods ended June 30, 2020 and 2019 . New Troubled Debt Restructurings (1) Three Months Ended June 30, 2020 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 98 $ — $ 26 $ — $ 52 $ 78 Commercial real estate 2 — 1 — — 1 Automobile 1,058 — 14 2 — 16 Home equity 63 — 2 1 — 3 Residential mortgage 105 — 12 2 — 14 RV and marine 68 — 3 — — 3 Other consumer 142 1 — — — 1 Total new TDRs 1,536 $ 1 $ 58 $ 5 $ 52 $ 116 Three Months Ended June 30, 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 101 $ — $ 39 $ — $ — $ 39 Commercial real estate 6 — 2 — — 2 Automobile 650 — 4 2 — 6 Home equity 68 — 2 1 — 3 Residential mortgage 96 — 10 1 — 11 RV and marine 31 — — 2 — 2 Other consumer 343 2 — — — 2 Total new TDRs 1,295 $ 2 $ 57 $ 6 $ — $ 65 New Troubled Debt Restructurings (1) Six Months Ended June 30, 2020 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 238 $ — $ 88 $ — $ 58 $ 146 Commercial real estate 9 — 3 — — 3 Automobile 1,856 — 20 4 — 24 Home equity 126 — 3 3 — 6 Residential mortgage 206 — 21 4 — 25 RV and marine finance 96 — 4 — — 4 Other consumer 391 2 — — — 2 Total new TDRs 2,922 $ 2 $ 139 $ 11 $ 58 $ 210 Six Months Ended June 30, 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 216 $ — $ 74 $ — $ — $ 74 Commercial real estate 14 — 11 — — 11 Automobile 1,394 — 9 4 — 13 Home equity 172 — 5 3 — 8 Residential mortgage 172 — 18 1 — 19 RV and marine finance 67 — — 1 — 1 Other consumer 587 3 — — — 3 Total new TDRs 2,622 $ 3 $ 117 $ 9 $ — $ 129 (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 on the provision (recovery) for loan and lease losses. Amounts for the three-month periods ended June 30, 2020 and 2019 , were $ 1 million and less than $1 million respectively. For the six-month periods ended June 30, 2020 and 2019 , the financial effects of modification were $(4) million and $(3) million , respectively.

ALLOWANCE FOR CREDIT LOSSES ALL

ALLOWANCE FOR CREDIT LOSSES ALLOWANCE FOR CREDIT LOSSES (Tables)	6 Months Ended
	Jun. 30, 2020
Credit Loss [Abstract]
Financing Receivable, Allowance for Credit Loss [Table Text Block]	Allowance for Loan and Lease Losses and Allowance for Credit Losses - Roll-forward The following table presents ALLL and AULC activity by portfolio segment for the three-month and six-month periods ended June 30, 2020 and 2019 . (dollar amounts in millions) Commercial Consumer Total Three-month period ended June 30, 2020: ALLL balance, beginning of period $ 996 $ 508 $ 1,504 Loan charge-offs (84 ) (39 ) (123 ) Recoveries of loans previously charged-off 4 12 16 Provision for loan and lease losses 253 52 305 ALLL balance, end of period $ 1,169 $ 533 $ 1,702 AULC balance, beginning of period $ 58 $ 41 $ 99 Provision (reduction in allowance) for unfunded loan commitments and letters of credit 25 (3 ) 22 Unfunded commitment losses (2 ) — (2 ) AULC balance, end of period $ 81 $ 38 $ 119 ACL balance, end of period $ 1,250 $ 571 $ 1,821 Six-month period ended June 30, 2020: ALLL balance, beginning of period $ 552 $ 231 $ 783 Cumulative-effect of change in accounting principle for financial instruments - credit losses (1) 180 211 391 Loan charge-offs (172 ) (87 ) (259 ) Recoveries of loans previously charged-off 9 26 35 Provision for loan and lease losses 600 152 752 ALLL balance, end of period $ 1,169 $ 533 $ 1,702 AULC balance, beginning of period $ 102 $ 2 $ 104 Cumulative-effect of change in accounting principle for financial instruments - credit losses (1) 2 — 2 Provision (reduction in allowance) for unfunded loan commitments and letters of credit (20 ) 36 16 Unfunded commitment losses (3 ) — (3 ) AULC balance, end of period $ 81 $ 38 $ 119 ACL balance, end of period $ 1,250 $ 571 $ 1,821 (1) Relates to day one impact of the CECL adjustment as a result of the implementation of ASU 2016-13. (dollar amounts in millions) Commercial Consumer Total Three-month period ended June 30, 2019: ALLL balance, beginning of period $ 545 $ 219 $ 764 Loan charge-offs (24 ) (46 ) (70 ) Recoveries of loans previously charged-off 6 16 22 Provision for loan and lease losses 33 25 58 ALLL balance, end of period $ 560 $ 214 $ 774 AULC balance, beginning of period $ 98 $ 2 $ 100 Provision (reduction in allowance) for unfunded loan commitments and letters of credit 1 — 1 AULC balance, end of period $ 99 $ 2 $ 101 ACL balance, end of period $ 659 $ 216 $ 875 Six-month period ended June 30, 2019: ALLL balance, beginning of period $ 542 $ 230 $ 772 Loan charge-offs (70 ) (97 ) (167 ) Recoveries of loans previously charged-off 19 29 48 Provision for loan and lease losses 69 52 121 ALLL balance, end of period $ 560 $ 214 $ 774 AULC balance, beginning of period $ 94 $ 2 $ 96 Provision (reduction in allowance) for unfunded loan commitments and letters of credit 5 — 5 AULC balance, end of period $ 99 $ 2 $ 101 ACL balance, end of period $ 659 $ 216 $ 875

MORTGAGE LOAN SALES AND SERVI_2

MORTGAGE LOAN SALES AND SERVICING RIGHTS (Tables)	6 Months Ended
MORTGAGE LOAN SALES AND SERVICING RIGHTS (Tables)	Jun. 30, 2020
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 and six-month periods ended June 30, 2020 and 2019 : Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Residential mortgage loans sold with servicing retained $ 2,287 $ 954 $ 3,715 $ 1,787 Pretax gains resulting from above loan sales (1) 59 23 98 35 (1) Recorded in mortgage banking income
Summarizes activity relating to loans sold with servicing retained using the fair value method	The following table summarizes the changes in MSRs recorded using the fair value method for the three-month and six-month periods ended June 30, 2020 and 2019 (1): Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 (1) 2020 2019 (1) Fair value, beginning of period $ 165 $ 10 $ 7 $ 10 Fair value election for servicing assets previously measured using the amortized method — — 205 — New servicing assets created 26 — 40 — Change in fair value during the period due to: Time decay (2) (2 ) — (4 ) — Payoffs (3) (10 ) — (16 ) — Changes in valuation inputs or assumptions (4) (7 ) (1 ) (60 ) (1 ) Fair value, end of period $ 172 $ 9 $ 172 $ 9 Weighted-average life (years) 6.5 6.4 6.5 6.4 (1) Prior to January 1, 2020, substantially all of Huntington’s MSR assets were recorded at amortized cost. (2) Represents decrease in value due to passage of time, including the impact from both regularly scheduled loan principal payments and partial loan paydowns. (3) Represents decrease in value associated with loans that paid off during the period. (4) Represents change in value resulting primarily from market-driven changes in interest rates and prepayment speeds.
Summary of key assumptions and the sensitivity of the servicing rights value to changes in the assumptions	For MSRs under the fair value method, a summary of key assumptions and the sensitivity of the MSR value to changes in these assumptions at June 30, 2020 , and December 31, 2019 follows: June 30, 2020 December 31, 2019 (1) 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) 17.32 % $ (9 ) $ (17 ) 8.21 % $ — $ — Spread over forward interest rate swap rates 793 bps (5 ) (9 ) 824 bps — — (1) Prior to January 1, 2020, substantially all of Huntington’s MSR assets were recorded at amortized cost.

OTHER COMPREHENSIVE INCOME (Tab

OTHER COMPREHENSIVE INCOME (Tables)	6 Months Ended
OTHER COMPREHENSIVE INCOME (Tables)	Jun. 30, 2020
Equity [Abstract]
Components of other comprehensive income	The components of Huntington’s OCI for the three-month and six-month periods ended June 30, 2020 and 2019 , 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 $ 57 $ (13 ) $ 44 Less: Reclassification adjustment for realized net losses (gains) included in net income 23 (5 ) 18 Net change in unrealized holding gains (losses) on available-for-sale securities 80 (18 ) 62 Net change in fair value on cash flow hedges 14 (3 ) 11 Net change in pension and other post-retirement obligations (1) (12 ) 2 (10 ) Total other comprehensive income (loss) $ 82 $ (19 ) $ 63 (1) Includes a settlement gain recognized in other noninterest income on the Unaudited Condensed Consolidated Statements of Income. 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 $ 163 $ (36 ) $ 127 Less: Reclassification adjustment for realized net losses (gains) included in net income 9 (2 ) 7 Net change in unrealized gains (losses) on available-for-sale securities 172 (38 ) 134 Net change in fair value on cash flow hedges 60 (13 ) 47 Net change in pension and other post-retirement obligations 1 — 1 Total other comprehensive income (loss) $ 233 $ (51 ) $ 182 Six Months Ended Tax (expense) (dollar amounts in millions) Pretax Benefit After-tax Unrealized holding gains (losses) on available-for-sale securities arising during the period $ 274 $ (61 ) $ 213 Less: Reclassification adjustment for realized net losses (gains) included in net income 28 (6 ) 22 Net change in unrealized holding gains (losses) on available-for-sale securities 302 (67 ) 235 Net change in fair value on cash flow hedges 409 (90 ) 319 Net change in pension and other post-retirement obligations (1) (10 ) 2 (8 ) Total other comprehensive income (loss) $ 701 $ (155 ) $ 546 (1) Includes a settlement gain recognized in other noninterest income on the Unaudited Condensed Consolidated Statements of Income. Six Months Ended Tax (expense) (dollar amounts in millions) Pretax Benefit After-tax Unrealized holding gains (losses) on available-for-sale securities arising during the period $ 347 $ (77 ) $ 270 Less: Reclassification adjustment for realized net losses (gains) included in net income 13 (3 ) 10 Net change in unrealized holding gains (losses) on available-for-sale securities 360 (80 ) 280 Net change in fair value on cash flow hedges 68 (14 ) 54 Net change in pension and other post-retirement obligations 2 — 2 Total other comprehensive income (loss) $ 430 $ (94 ) $ 336
Activity in accumulated other comprehensive income, net of tax	Activity in accumulated OCI for the three-month and six-month periods ended June 30, 2020 and 2019 , 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 (2) Total Three Months Ended June 30, 2020 Balance, beginning of period $ 145 $ 331 $ (249 ) $ 227 Other comprehensive income before reclassifications 44 11 — 55 Amounts reclassified from accumulated OCI to earnings 18 — (10 ) 8 Period change 62 11 (10 ) 63 Balance, end of period $ 207 $ 342 $ (259 ) $ 290 Three Months Ended June 30, 2019 Balance, beginning of period $ (217 ) $ 7 $ (245 ) $ (455 ) Other comprehensive income before reclassifications 127 47 — 174 Amounts reclassified from accumulated OCI to earnings 7 — 1 8 Period change 134 47 1 182 Balance, end of period $ (83 ) $ 54 $ (244 ) $ (273 ) (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 (2) Total Six Months Ended June 30, 2020 Balance, beginning of period $ (28 ) $ 23 $ (251 ) $ (256 ) Other comprehensive income before reclassifications 213 319 — 532 Amounts reclassified from accumulated OCI to earnings 22 — (8 ) 14 Period change 235 319 (8 ) 546 Balance, end of period $ 207 $ 342 $ (259 ) $ 290 Six Months Ended June 30, 2019 Balance, beginning of period $ (363 ) $ — $ (246 ) $ (609 ) Other comprehensive income before reclassifications 270 54 — 324 Amounts reclassified from accumulated OCI to earnings 10 — 2 12 Period change 280 54 2 336 Balance, end of period $ (83 ) $ 54 $ (244 ) $ (273 ) (1) AOCI amounts at June 30, 2020 , March 31, 2020 and June 30, 2019 include $81 million , $87 million and $131 million
Reclassification Out Of Accumulated OCI	1) AOCI amounts at June 30, 2020 , March 31, 2020 and June 30, 2019 include $81 million , $87 million and $131 million , respectively, net of 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. (2) Amounts for the three months and six months ended June 30, 2020 include a settlement gain recognized in other noninterest income on the Unaudited Condensed Consolidated Statements of Income.

SHAREHOLDERS' EQUITY (Tables)

SHAREHOLDERS' EQUITY (Tables)	6 Months Ended
SHAREHOLDERS' EQUITY (Tables)	Jun. 30, 2020
Class of Stock [Line Items]
Schedule of Stock by Class [Table Text Block]	The following is a summary of Huntington’s non-cumulative, non-voting, perpetual preferred stock outstanding as of June 30, 2020 . (dollar amounts in millions) Series Issuance Date Total Shares Outstanding Carrying Amount Dividend Rate Earliest Redemption Date Series B 12/28/2011 35,500 $ 23 3-mo. LIBOR + 270 bps 1/15/2017 Series D 3/21/2016 400,000 386 6.25 % 4/15/2021 Series D 5/5/2016 200,000 199 6.25 % 4/15/2021 Series C 8/16/2016 100,000 100 5.875 % 1/15/2022 Series E 2/27/2018 5,000 495 5.700 % 4/15/2023 Series F 5/27/2020 5,000 494 5.625 % 7/15/2030 Total 745,500 $ 1,697

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	6 Months Ended
EARNINGS PER SHARE (Tables)	Jun. 30, 2020
Earnings Per Share [Abstract]
Basic and diluted earnings loss per share	The calculation of basic and diluted earnings per share for the three-month and six-month periods ended June 30, 2020 and 2019 was as follows: Three Months Ended Six Months Ended (dollar amounts in millions, except per share data, share count in thousands) 2020 2019 2020 2019 Basic earnings per common share: Net income $ 150 $ 364 $ 198 $ 722 Preferred stock dividends (19 ) (18 ) (37 ) (37 ) Net income available to common shareholders $ 131 $ 346 $ 161 $ 685 Average common shares issued and outstanding 1,016,259 1,044,802 1,016,951 1,045,899 Basic earnings per common share $ 0.13 $ 0.33 $ 0.16 $ 0.66 Diluted earnings per common share: Dilutive potential common shares: Stock options and restricted stock units and awards 7,516 11,308 9,939 13,057 Shares held in deferred compensation plans 4,908 4,170 4,739 4,003 Dilutive potential common shares 12,424 15,478 14,678 17,060 Total diluted average common shares issued and outstanding 1,028,683 1,060,280 1,031,629 1,062,959 Diluted earnings per common share $ 0.13 $ 0.33 $ 0.16 $ 0.64 Anti-dilutive awards (1) 17,200 7,656 12,291 6,237

NONINTEREST INCOME NONINTEREST

NONINTEREST INCOME NONINTEREST INCOME (Tables)	6 Months Ended
NONINTEREST INCOME NONINTEREST INCOME (Tables)	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Schedule of Noninterest Income	The following table illustrates the disaggregation by operating segment and major revenue stream and reconciles disaggregated revenue to segment revenue presented in Note 16 “ Segment Reporting ”. Three Months Ended June 30, 2020 (dollar amounts in millions) Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated Major Revenue Streams Service charges on deposit accounts $ 39 $ 18 $ 1 $ 1 $ — $ 59 Card and payment processing income 52 3 — — — 55 Trust and investment management services 10 1 — 34 — 45 Insurance income 12 1 — 11 1 25 Other noninterest income 4 5 — 7 1 17 Net revenue from contracts with customers $ 117 $ 28 $ 1 $ 53 $ 2 $ 201 Noninterest income within the scope of other GAAP topics 101 57 1 1 30 190 Total noninterest income $ 218 $ 85 $ 2 $ 54 $ 32 $ 391 Three Months Ended June 30, 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 $ 73 $ 16 $ 2 $ 1 $ — $ 92 Card and payment processing income 56 4 — — — 60 Trust and investment management services 8 1 — 34 — 43 Insurance income 9 1 — 12 1 23 Other noninterest income 8 5 1 1 2 17 Net revenue from contracts with customers $ 154 $ 27 $ 3 $ 48 $ 3 $ 235 Noninterest income within the scope of other GAAP topics 44 62 1 1 31 139 Total noninterest income $ 198 $ 89 $ 4 $ 49 $ 34 $ 374 Six Months Ended June 30, 2020 (dollar amounts in millions) Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated Major Revenue Streams Service charges on deposit accounts $ 107 $ 35 $ 2 $ 2 $ — $ 146 Card and payment processing income 104 7 — — — 111 Trust and investment management services 20 2 — 70 — 92 Insurance income 20 3 — 23 2 48 Other noninterest income 12 8 1 8 2 31 Net revenue from contracts with customers $ 263 $ 55 $ 3 $ 103 $ 4 $ 428 Noninterest income within the scope of other GAAP topics 167 115 2 2 38 324 Total noninterest income $ 430 $ 170 $ 5 $ 105 $ 42 $ 752 Six Months Ended June 30, 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 $ 142 $ 32 $ 3 $ 2 $ — $ 179 Card and payment processing income 106 7 — — — 113 Trust and investment management services 16 1 — 69 1 87 Insurance income 17 3 — 23 1 44 Other noninterest income 16 10 2 4 2 34 Net revenue from contracts with customers $ 297 $ 53 $ 5 $ 98 $ 4 $ 457 Noninterest income within the scope of other GAAP topics 75 112 1 2 46 236 Total noninterest income $ 372 $ 165 $ 6 $ 100 $ 50 $ 693 (dollar amounts in millions) Three Months Ended June 30, Six Months Ended June 30, Noninterest income 2020 2019 2020 2019 Noninterest income from contracts with customers $ 201 $ 235 $ 428 $ 457 Noninterest income within the scope of other GAAP topics 190 139 324 236 Total noninterest income $ 391 $ 374 $ 752 $ 693

FAIR VALUES OF ASSETS AND LIA_2

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

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	6 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Asset and liability derivatives included in accrued income and other assets	June 30, 2020 December 31, 2019 (dollar amounts in millions) Notional Value Asset Liability Notional Value Asset Liability Derivatives designated as Hedging Instruments Interest rate contracts $ 28,819 $ 975 $ 86 $ 25,927 $ 256 $ 36 Derivatives not designated as Hedging Instruments Interest rate contracts 32,025 1,122 951 27,614 420 314 Foreign exchange contracts 2,093 27 27 2,173 19 18 Commodities contracts 2,278 197 193 3,020 155 152 Equity contracts 478 — 22 427 6 1 Total Contracts $ 65,693 $ 2,321 $ 1,279 $ 59,161 $ 856 $ 521
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 and six-month periods ended June 30, 2020 and 2019 , respectively. Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Interest rate contracts: Customer Capital markets fees $ 12 $ 12 $ 29 $ 22 Mortgage Banking Mortgage banking income 6 22 63 34 Interest Rate Floors Other noninterest income — 5 — 5 Foreign exchange contracts Capital markets fees 6 7 12 15 Commodities contracts Capital markets fees 1 2 3 (4 ) Equity contracts Other noninterest expense (1 ) — (3 ) (1 ) Total $ 24 $ 48 $ 104 $ 71
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 June 30, 2020 and December 31, 2019 , identified by the underlying interest rate-sensitive instruments. June 30, 2020 (dollar amounts in millions) Fair Value Hedges Cash Flow Hedges Total Instruments associated with: Loans $ — $ 18,375 $ 18,375 Investment securities 2,950 — 2,950 Long-term debt 7,494 — 7,494 Total notional value at June 30, 2020 $ 10,444 $ 18,375 $ 28,819 December 31, 2019 (dollar amounts in millions) Fair Value Hedges Cash Flow Hedges Total Instruments associated with: Loans $ — $ 18,375 $ 18,375 Investment securities — 12 12 Long-term debt 7,540 — 7,540 Total notional value at December 31, 2019 $ 7,540 $ 18,387 $ 25,927
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 and six-month periods ended June 30, 2020 and 2019 . Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Interest rate contracts Change in fair value of interest rate swaps hedging investment securities (1) $ (1 ) $ — $ (1 ) $ — Change in fair value of hedged investment securities (1) 1 — 1 — Change in fair value of interest rate swaps hedging long-term debt (2) (5 ) 88 196 129 Change in fair value of hedged long term debt (2) (4 ) (88 ) (195 ) (129 ) (1) Recognized in Interest income—available-for-sale securities—taxable in the Unaudited Condensed Consolidated Statements of Income (2) 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 June 30, 2020 , and December 31, 2019 , the following amounts were recorded on the balance sheet related to cumulative basis adjustments for fair value hedges. Amortized Cost Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (dollar amounts in millions) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Investment securities (1) $ 7,573 $ — $ 1 $ — Long-term debt 7,242 7,578 309 114 Total $ 14,815 $ 7,578 $ 310 $ 114 (1) Amounts include the amortized cost basis of closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. As of June 30, 2020 , the amortized cost basis of the closed portfolios used in these hedging relationships was $7.6 billion , the cumulative basis adjustments associated with these hedging relationships was $1.0 million , and the amounts of the designated hedged items were $3.0 billion . The cumulative amount of fair value hedging adjustments remaining for any hedged assets and liabilities for which hedge accounting has been discontinued was $(76) million and $(93) million at June 30, 2020 and December 31, 2019 , 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 June 30, 2020 and December 31, 2019 . 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 June 30, 2020 Derivatives $ 2,321 $ (1,214 ) $ 1,107 $ (129 ) $ (59 ) $ 919 December 31, 2019 Derivatives 856 (404 ) 452 (65 ) (29 ) 358
MSR Derivative Hedging	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) June 30, 2020 December 31, 2019 Notional value $ 540 $ 778 Trading assets 69 19 Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Trading gains $ 6 $ 18 $ 63 $ 25
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 delivered Net amount June 30, 2020 Derivatives $ 1,279 $ (1,107 ) $ 172 $ (40 ) $ (28 ) $ 104 December 31, 2019 Derivatives 521 (417 ) 104 — (75 ) 29

VIEs (Tables)

VIEs (Tables)	6 Months Ended
VIEs (Tables)	Jun. 30, 2020
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 June 30, 2020 , and December 31, 2019 : June 30, 2020 (dollar amounts in millions) Total Assets Total Liabilities Maximum Exposure to Loss Trust Preferred Securities $ 14 $ 252 $ — Affordable Housing Tax Credit Partnerships 858 432 858 Other Investments 220 59 220 Total $ 1,092 $ 743 $ 1,078 December 31, 2019 (dollar amounts in millions) Total Assets Total Liabilities Maximum Exposure to Loss Trust Preferred Securities $ 14 $ 252 $ — Affordable Housing Tax Credit Partnerships 727 332 727 Other Investments 179 63 179 Total $ 920 $ 647 $ 906
Summary of Outstanding Trust Preferred Securities	A list of trust preferred securities outstanding at June 30, 2020 follows: (dollar amounts in millions) Rate Principal amount of subordinated note/ debenture issued to trust (1) Investment in unconsolidated subsidiary Huntington Capital I 1.00 % (2) $ 70 $ 6 Huntington Capital II 0.93 (3) 32 3 Sky Financial Capital Trust III 1.70 (4) 72 2 Sky Financial Capital Trust IV 1.70 (4) 74 2 Camco Financial Trust 1.63 (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 June 30, 2020 , based on three-month LIBOR + 0.70% . (3) Variable effective rate at June 30, 2020 , based on three-month LIBOR + 0.625% . (4) Variable effective rate at June 30, 2020 , based on three-month LIBOR + 1.40% . (5) Variable effective rate at June 30, 2020 , 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 June 30, 2020 and December 31, 2019 . (dollar amounts in millions) June 30, December 31, Affordable housing tax credit investments $ 1,423 $ 1,242 Less: amortization (565 ) (515 ) Net affordable housing tax credit investments $ 858 $ 727 Unfunded commitments $ 432 $ 332 The following table presents other information relating to Huntington’s affordable housing tax credit investments for the three-month and six-month periods ended June 30, 2020 and 2019 . Three Months Ended Six Months Ended (dollar amounts in millions) 2020 2019 2020 2019 Tax credits and other tax benefits recognized $ 30 $ 26 $ 59 $ 53 Proportional amortization expense included in provision for income taxes 25 22 50 44

COMMITMENTS AND CONTINGENT LI_2

COMMITMENTS AND CONTINGENT LIABILITIES (Tables)	6 Months Ended
COMMITMENTS AND CONTINGENT LIABILITIES (Tables)	Jun. 30, 2020
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 June 30, 2020 and December 31, 2019 , were as follows: (dollar amounts in millions) June 30, December 31, Contract amount representing credit risk Commitments to extend credit: Commercial $ 20,283 $ 18,326 Consumer 14,735 14,831 Commercial real estate 1,261 1,364 Standby letters of credit 591 587 Commercial letters of credit 20 8

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	6 Months Ended
SEGMENT REPORTING (Tables)	Jun. 30, 2020
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three Months Ended June 30, Income Statements Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated (dollar amounts in millions) 2020 Net interest income $ 368 $ 240 $ 100 $ 40 $ 44 $ 792 Provision (benefit) for credit losses 31 226 70 — — 327 Noninterest income 218 85 2 54 32 391 Noninterest expense 422 136 34 62 21 675 Provision (benefit) for income taxes 27 (7 ) — 6 5 31 Net income (loss) $ 106 $ (30 ) $ (2 ) $ 26 $ 50 $ 150 2019 Net interest income $ 464 $ 264 $ 96 $ 52 $ (64 ) $ 812 Provision (benefit) for credit losses 30 24 5 — — 59 Noninterest income 198 89 4 49 34 374 Noninterest expense 427 145 38 67 23 700 Provision (benefit) for income taxes 43 39 12 7 (38 ) 63 Net income (loss) $ 162 $ 145 $ 45 $ 27 $ (15 ) $ 364 Six Months Ended June 30, Income Statements Consumer & Business Banking Commercial Banking Vehicle Finance RBHPCG Treasury / Other Huntington Consolidated (dollar amounts in millions) 2020 Net interest income $ 733 $ 472 $ 206 $ 83 $ 88 $ 1,582 Provision (benefit) for credit losses 114 523 131 — — 768 Noninterest income 430 170 5 105 42 752 Noninterest expense 840 265 69 124 29 1,327 Provision (benefit) for income taxes 44 (31 ) 2 14 12 41 Net income (loss) $ 165 $ (115 ) $ 9 $ 50 $ 89 $ 198 2019 Net interest income $ 936 $ 536 $ 191 $ 104 $ (133 ) $ 1,634 Provision (benefit) for credit losses 48 67 14 (3 ) — 126 Noninterest income 372 165 6 100 50 693 Noninterest expense 827 288 75 130 33 1,353 Provision (benefit) for income taxes 91 73 23 16 (77 ) 126 Net income (loss) $ 342 $ 273 $ 85 $ 61 $ (39 ) $ 722 Assets at Deposits at (dollar amounts in millions) June 30, December 31, June 30, December 31, Consumer & Business Banking $ 30,697 $ 25,073 $ 59,202 $ 51,675 Commercial Banking 35,323 34,337 22,041 20,762 Vehicle Finance 19,137 20,155 824 376 RBHPCG 6,855 6,665 6,834 6,370 Treasury / Other 26,413 22,772 4,790 3,164 Total $ 118,425 $ 109,002 $ 93,691 $ 82,347
Segment Disclosure of Assets and Deposits	Assets at Deposits at (dollar amounts in millions) June 30, December 31, June 30, December 31, Consumer & Business Banking $ 30,697 $ 25,073 $ 59,202 $ 51,675 Commercial Banking 35,323 34,337 22,041 20,762 Vehicle Finance 19,137 20,155 824 376 RBHPCG 6,855 6,665 6,834 6,370 Treasury / Other 26,413 22,772 4,790 3,164 Total $ 118,425 $ 109,002 $ 93,691 $ 82,347

INVESTMENT SECURITIES AND OTH_3

INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 12,951	$ 14,063
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	382	137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	36	51
Debt Securities, Available-for-sale	13,297	14,149
Held-to-maturity securities	9,416	9,070
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	440	119
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(3)
Debt Securities, Held-to-maturity, Fair Value	9,856	9,186
Equity Securities, FV-NI, Cost	437	441
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax	1	0
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	438	441
US Treasury Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	8	10
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	8	10
Collateralized Mortgage Obligations [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,933	5,055
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	185	48
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	18
Debt Securities, Available-for-sale	5,118	5,085
Held-to-maturity securities	2,151	2,351
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	106	33
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(3)
Debt Securities, Held-to-maturity, Fair Value	2,257	2,381
Residential Mortgage Backed Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,718	4,180
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	120	45
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	3
Debt Securities, Available-for-sale	3,838	4,222
Held-to-maturity securities	3,361	2,463
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	120	50
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	3,481	2,513
Commercial Mortgage Backed Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	764	979
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	24	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	4
Debt Securities, Available-for-sale	788	976
Held-to-maturity securities	3,631	3,959
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	202	34
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	3,833	3,993
Other Federal Agencies [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	144	165
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	1
Debt Securities, Available-for-sale	147	165
Held-to-maturity securities	269	293
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	12	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	281	295
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,567	10,389
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	332	95
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	26
Debt Securities, Available-for-sale	9,899	10,458
Held-to-maturity securities	9,412	9,066
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	440	119
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(3)
Debt Securities, Held-to-maturity, Fair Value	9,852	9,182
Municipal securities
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,145	3,044
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	47	34
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	35	23
Debt Securities, Available-for-sale	3,157	3,055
Held-to-maturity securities	4	4
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	4
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	5
Asset-backed Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	208	575
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	2
Debt Securities, Available-for-sale	211	579
Corporate Debt Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	22	49
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1	0
Debt Securities, Available-for-sale	21	51
Other Securities [Member]
Schedule of investment securities and other securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4	4
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	4
Mutual Fund [Member]
Schedule of investment securities and other securities [Line Items]
Equity Securities, FV-NI, Cost	52	53
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	52	53
Equity Securities [Member]
Schedule of investment securities and other securities [Line Items]
Equity Securities, FV-NI, Cost	3	1
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax	1	0
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	4	1
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	84	90
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	84	90
Investment in Federal Reserve Stock [Member] \| Nonmarketable Equity Securities [Member]
Schedule of investment securities and other securities [Line Items]
Equity Securities, FV-NI, Cost	298	297
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	$ 298	$ 297

INVESTMENT SECURITIES AND OTH_4

INVESTMENT SECURITIES AND OTHER SECURITIES - Contractual Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 344	$ 231
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	337	229
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,166	1,196
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,159	1,189
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	1,410	1,594
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	1,421	1,606
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	10,031	11,042
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	10,380	11,125
Debt Securities, Available-for-sale, Amortized Cost	12,951	14,063
Debt Securities, Available-for-sale	13,297	14,149
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	141	17
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	149	17
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	181	300
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	190	305
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	9,094	8,753
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	9,517	8,864
Held-to-maturity securities	9,416	9,070
Debt Securities, Held-to-maturity, Fair Value	$ 9,856	$ 9,186

INVESTMENT SECURITIES AND OTH_5

INVESTMENT SECURITIES AND OTHER SECURITIES INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 541	$ 3,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9	21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,079	2,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(27)	(30)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,620	5,364
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(36)	(51)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	678
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	112
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(2)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	0	790
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	3
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	74	1,206
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	519
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(8)
Debt Securities, Available-for-sale, Unrealized Loss Position	74	1,725
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(18)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	218
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	112
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(2)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	0	330
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	3
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		1,169
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	0	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	0	1,178
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(3)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	317
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	0	0
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	0	317
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	0
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	472
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	272
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(2)
Debt Securities, Available-for-sale, Unrealized Loss Position	0	744
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(4)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	81
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	0	0
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	0	81
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	0
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	86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	0	86
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(1)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	58
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	0	0
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	0	58
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	0
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	74	2,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	800
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(10)
Debt Securities, Available-for-sale, Unrealized Loss Position	74	3,733
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(26)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	674
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	112
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(2)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	0	786
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	3
Municipal securities
Investment securities and other securities disclosure [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	428	273
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,023	1,204
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(27)	(19)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,451	1,477
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(35)	(23)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	4
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	0	0
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	0	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	26	116
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	56	37
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(1)
Debt Securities, Available-for-sale, Unrealized Loss Position	82	153
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(2)
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	13	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	13	1
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (1)	$ 0

INVESTMENT SECURITIES AND OTH_6

INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Available For Sale Securities Transferred To Held To Maturity Securities	$ 1,500	$ 1,520	$ 0
Unrealized Net Losses Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities	22
Pledged Financial Instruments, Not Separately Reported, Securities for Other Debt Facilities	$ 18,500	$ 18,500		$ 3,800

LOANS AND LEASES - Narrative (D

LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable net premium	$ 384		$ 384		$ 525
Residual Value of Leased Asset	96		96		95
Future lease rental payments	1,800		1,800
Capital Leases, Future Minimum Payments Receivable, Next Twelve Months	600		600
Capital Leases, Future Minimum Payments, Receivable in Two Years	500		500
Capital Leases, Future Minimum Payments, Receivable in Three Years	300		300
Capital Leases, Future Minimum Payments, Receivable in Four Years	200		200
Capital Leases, Future Minimum Payments, Receivable in Five Years	100		100
Capital Leases, Future Minimum Payments, Receivable Thereafter	100		100
Direct Financing Lease, Interest Income	$ 28	$ 27		$ 53
Number of days past due	30 days
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 42,800		42,800		$ 39,600
Financing Receivable, Modifications, Effect of Modification	$ 1	$ 1	$ 4	$ (3)

LOANS AND LEASES - Loan and Lea

LOANS AND LEASES - Loan and Lease Portfolio Composition (Details) - USD ($) $ in Millions		Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	[1]	$ 80,139		$ 75,404
Allowance for loan and lease losses		(1,702)	$ (1,504)	(783)	$ (774)	$ (764)	$ (772)
Net loans and leases		78,437		74,621
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		34,879		30,664
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		7,179		6,674
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases				6,674
Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		12,678		12,797
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		8,866		9,093
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		11,621		11,376
RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		3,843		3,563
Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		1,073		1,237
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses		(533)	(508)	(231)	(214)	(219)	(230)
Consumer \| Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases				12,797
Consumer \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases				9,092
Consumer \| RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases				3,563
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases				30,664
Allowance for loan and lease losses		$ (1,169)	$ (996)	$ (552)	$ (560)	$ (545)	$ (542)

[1]	(1) Amounts represent loans for which Huntington has elected the fair value option. See Note 12 “ Fair Values of Assets and Liabilities ”.

LOANS AND LEASES LOANS AND LE_2

LOANS AND LEASES LOANS AND LEASES - Direct Financing Leases (Details) - Commercial and industrial - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	$ 1,762	$ 1,841
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property	691	728
Capital Leases Gross Investment In Direct Financing Leases	2,453	2,569
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs	19	19
Capital Leases, Net Investment in Direct Financing Leases, Deferred Income	214	249
Capital Leases, Net Investment in Direct Financing Leases	$ 2,258	$ 2,339

LOANS AND LEASES - Nonaccrual L

LOANS AND LEASES - Nonaccrual Loans by Loan Class (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 648	$ 468
Nonaccrual loans with no ACL	103	111
Commercial and industrial \| Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	485	323
Nonaccrual loans with no ACL	97	109
Commercial and industrial \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	28	10
Nonaccrual loans with no ACL	6	2
Consumer \| Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	8	4
Nonaccrual loans with no ACL	0	0
Consumer \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	59	59
Nonaccrual loans with no ACL	0	0
Consumer \| Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	66	71
Nonaccrual loans with no ACL	0	0
Consumer \| RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	2	1
Nonaccrual loans with no ACL	0	0
Consumer \| Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	0	0
Nonaccrual loans with no ACL	$ 0	$ 0

LOANS AND LEASES - NALs Past Du

LOANS AND LEASES - NALs Past Due (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no ACL		$ 103	$ 111
Total nonaccrual loans		648	468
Past Due		664	788
Current		79,383	74,535
Consumer loans		92	81
Loans and leases	[1]	80,139	75,404
90 or more days past due and accruing		194	171
30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		211	342
60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		100	129
90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		353	317
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		157	165
Current		34,722	30,499
Consumer loans		0	0
Loans and leases		34,879	30,664
90 or more days past due and accruing		13	11
Commercial and Industrial \| 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		46	65
Commercial and Industrial \| 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		24	31
Commercial and Industrial \| 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		87	69
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases			6,674
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		28	11
Current		7,151	6,663
Consumer loans		0	0
Loans and leases		7,179	6,674
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		3	3
Commercial Real Estate \| 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		21	1
Commercial Real Estate \| 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		4	7
Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		75	125
Current		12,603	12,672
Consumer loans		0	0
Loans and leases		12,678	12,797
90 or more days past due and accruing		8	8
Automobile \| 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		47	95
Automobile \| 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		14	19
Automobile \| 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		14	11
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		86	120
Current		8,779	8,972
Consumer loans		1	1
Loans and leases		8,866	9,093
90 or more days past due and accruing		10	14
Home equity \| 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		26	50
Home equity \| 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		12	19
Home equity \| 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		48	51
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		293	322
Current		11,237	10,974
Consumer loans		91	80
Loans and leases		11,621	11,376
90 or more days past due and accruing		158	129
Residential Mortgage \| 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		75	103
Residential Mortgage \| 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		24	49
Residential Mortgage \| 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		194	170
RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		14	19
Current		3,829	3,544
Consumer loans		0	0
Loans and leases		3,843	3,563
90 or more days past due and accruing		2	2
RV and marine \| 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		8	13
RV and marine \| 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		3	4
RV and marine \| 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		3	2
Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		11	26
Current		1,062	1,211
Consumer loans		0	0
Loans and leases		1,073	1,237
90 or more days past due and accruing		3	7
Other Consumer \| 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		6	13
Other Consumer \| 60-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		2	6
Other Consumer \| 90 or more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		3	7
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases			30,664
Commercial and industrial \| Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no ACL		97	109
Total nonaccrual loans		485	323
Commercial and industrial \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no ACL		6	2
Total nonaccrual loans		28	10
Consumer \| Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no ACL		0	0
Total nonaccrual loans		8	4
Loans and leases			12,797
Consumer \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no ACL		0	0
Total nonaccrual loans		59	59
Loans and leases			9,092
Consumer \| Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no ACL		0	0
Total nonaccrual loans		66	71
Consumer \| RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no ACL		0	0
Total nonaccrual loans		2	1
Loans and leases			3,563
Consumer \| Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans with no ACL		0	0
Total nonaccrual loans		$ 0	$ 0

[1]	(1) Amounts represent loans for which Huntington has elected the fair value option. See Note 12 “ Fair Values of Assets and Liabilities ”.

LOANS AND LEASES - Vintage Cred

LOANS AND LEASES - Vintage Credit Quality (Details) $ in Millions	Jun. 30, 2020USD ($)
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 10,258
2019	6,221
2018	4,105
2017	2,190
2016	1,404
Prior	1,607
Revolver Total at Amortized Cost Basis	9,091
Revolver Total Converted to Term Loans	3
Total	34,879
Accrued interest	106
Commercial and industrial \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	9,667
2019	5,916
2018	3,675
2017	1,937
2016	1,236
Prior	1,369
Revolver Total at Amortized Cost Basis	8,112
Revolver Total Converted to Term Loans	3
Total	31,915
Commercial and industrial \| OLEM
Financing Receivable, Credit Quality Indicator [Line Items]
2020	348
2019	118
2018	146
2017	59
2016	77
Prior	33
Revolver Total at Amortized Cost Basis	268
Revolver Total Converted to Term Loans	0
Total	1,049
Commercial and industrial \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	241
2019	187
2018	279
2017	194
2016	91
Prior	204
Revolver Total at Amortized Cost Basis	711
Revolver Total Converted to Term Loans	0
Total	1,907
Commercial and industrial \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2
2019	0
2018	5
2017	0
2016	0
Prior	1
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	8
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,086
2019	1,786
2018	1,398
2017	699
2016	689
Prior	754
Revolver Total at Amortized Cost Basis	767
Revolver Total Converted to Term Loans	0
Total	7,179
Commercial real estate \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,023
2019	1,616
2018	1,287
2017	603
2016	610
Prior	700
Revolver Total at Amortized Cost Basis	720
Revolver Total Converted to Term Loans	0
Total	6,559
Commercial real estate \| OLEM
Financing Receivable, Credit Quality Indicator [Line Items]
2020	44
2019	140
2018	100
2017	59
2016	23
Prior	32
Revolver Total at Amortized Cost Basis	37
Revolver Total Converted to Term Loans	0
Total	435
Commercial real estate \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	19
2019	30
2018	11
2017	37
2016	56
Prior	20
Revolver Total at Amortized Cost Basis	10
Revolver Total Converted to Term Loans	0
Total	183
Commercial real estate \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	2
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	2
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Accrued interest	127
Consumer \| Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,435
2019	4,510
2018	2,780
2017	1,802
2016	814
Prior	337
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	12,678
Consumer \| Automobile \| 750 plus
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,389
2019	2,367
2018	1,442
2017	1,025
2016	449
Prior	170
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	6,842
Consumer \| Automobile \| 650-749
Financing Receivable, Credit Quality Indicator [Line Items]
2020	921
2019	1,752
2018	1,011
2017	551
2016	247
Prior	100
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	4,582
Consumer \| Automobile \| Less than 650
Financing Receivable, Credit Quality Indicator [Line Items]
2020	125
2019	391
2018	327
2017	226
2016	118
Prior	67
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	1,254
Consumer \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	274
2019	45
2018	47
2017	54
2016	148
Prior	831
Revolver Total at Amortized Cost Basis	6,970
Revolver Total Converted to Term Loans	496
Total	8,865
Consumer \| Home equity \| 750 plus
Financing Receivable, Credit Quality Indicator [Line Items]
2020	236
2019	32
2018	36
2017	39
2016	110
Prior	547
Revolver Total at Amortized Cost Basis	4,511
Revolver Total Converted to Term Loans	193
Total	5,704
Consumer \| Home equity \| 650-749
Financing Receivable, Credit Quality Indicator [Line Items]
2020	38
2019	12
2018	10
2017	14
2016	31
Prior	198
Revolver Total at Amortized Cost Basis	2,130
Revolver Total Converted to Term Loans	189
Total	2,622
Consumer \| Home equity \| Less than 650
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	1
2018	1
2017	1
2016	7
Prior	86
Revolver Total at Amortized Cost Basis	329
Revolver Total Converted to Term Loans	114
Total	539
Consumer \| Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,016
2019	2,285
2018	1,721
2017	1,781
2016	1,217
Prior	2,510
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	11,530
Consumer \| Residential mortgage \| 750 plus
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,492
2019	1,664
2018	1,236
2017	1,384
2016	950
Prior	1,608
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	8,334
Consumer \| Residential mortgage \| 650-749
Financing Receivable, Credit Quality Indicator [Line Items]
2020	512
2019	586
2018	418
2017	322
2016	209
Prior	565
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	2,612
Consumer \| Residential mortgage \| Less than 650
Financing Receivable, Credit Quality Indicator [Line Items]
2020	12
2019	35
2018	67
2017	75
2016	58
Prior	337
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	584
Consumer \| RV and marine
Financing Receivable, Credit Quality Indicator [Line Items]
2020	695
2019	864
2018	946
2017	578
2016	265
Prior	495
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	3,843
Consumer \| RV and marine \| 750 plus
Financing Receivable, Credit Quality Indicator [Line Items]
2020	562
2019	585
2018	682
2017	386
2016	174
Prior	300
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	2,689
Consumer \| RV and marine \| 650-749
Financing Receivable, Credit Quality Indicator [Line Items]
2020	131
2019	263
2018	239
2017	165
2016	77
Prior	159
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	1,034
Consumer \| RV and marine \| Less than 650
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2
2019	16
2018	25
2017	27
2016	14
Prior	36
Revolver Total at Amortized Cost Basis	0
Revolver Total Converted to Term Loans	0
Total	120
Consumer \| Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	74
2019	154
2018	61
2017	21
2016	9
Prior	16
Revolver Total at Amortized Cost Basis	666
Revolver Total Converted to Term Loans	72
Total	1,073
Consumer \| Other consumer \| 750 plus
Financing Receivable, Credit Quality Indicator [Line Items]
2020	52
2019	69
2018	32
2017	11
2016	5
Prior	10
Revolver Total at Amortized Cost Basis	325
Revolver Total Converted to Term Loans	2
Total	506
Consumer \| Other consumer \| 650-749
Financing Receivable, Credit Quality Indicator [Line Items]
2020	21
2019	74
2018	25
2017	8
2016	3
Prior	5
Revolver Total at Amortized Cost Basis	311
Revolver Total Converted to Term Loans	32
Total	479
Consumer \| Other consumer \| Less than 650
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1
2019	11
2018	4
2017	2
2016	1
Prior	1
Revolver Total at Amortized Cost Basis	30
Revolver Total Converted to Term Loans	38
Total	$ 88

LOANS AND LEASES - Credit Quali

LOANS AND LEASES - Credit Quality Indicators (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	[1]	$ 80,139	$ 75,404
Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial		12,678	12,797
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial		8,866	9,093
RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial		$ 3,843	3,563
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			30,664
Commercial and industrial \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			28,477
Commercial and industrial \| OLEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			634
Commercial and industrial \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			1,551
Commercial and industrial \| Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			2
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			6,674
Commercial real estate \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			6,487
Commercial real estate \| OLEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			98
Commercial real estate \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			88
Commercial real estate \| Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			1
Consumer \| Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			12,797
Consumer \| Automobile \| 750 plus
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			6,759
Consumer \| Automobile \| 650-749
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			4,661
Consumer \| Automobile \| Less than 650
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			1,377
Consumer \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			9,092
Consumer \| Home equity \| 750 plus
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			5,763
Consumer \| Home equity \| 650-749
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			2,772
Consumer \| Home equity \| Less than 650
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			557
Consumer \| Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			11,296
Consumer \| Residential mortgage \| 750 plus
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			7,976
Consumer \| Residential mortgage \| 650-749
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			2,742
Consumer \| Residential mortgage \| Less than 650
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			578
Consumer \| RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			3,563
Consumer \| RV and marine \| 750 plus
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			2,391
Consumer \| RV and marine \| 650-749
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			1,053
Consumer \| RV and marine \| Less than 650
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			119
Consumer \| Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			1,237
Consumer \| Other consumer \| 750 plus
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			546
Consumer \| Other consumer \| 650-749
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			571
Consumer \| Other consumer \| Less than 650
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial			$ 120

[1]	(1) Amounts represent loans for which Huntington has elected the fair value option. See Note 12 “ Fair Values of Assets and Liabilities ”.

LOANS AND LEASES - TDRs (Detail

LOANS AND LEASES - TDRs (Details) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
LOANS AND LEASES - TDRs (Details) $ in Millions	Jun. 30, 2020USD ($)contract	Dec. 31, 2019USD ($)contract	Jun. 30, 2020USD ($)contract	Dec. 31, 2019USD ($)contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Number of Contracts \| contract	1,536	1,295	2,922	2,622
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 116	$ 65	$ 210	$ 129
Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	1	2	2	3
Amortization or maturity date change
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	58	57	139	117
Chapter 7 bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	5	6	11	9
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 52	$ 0	$ 58	$ 0
Commercial and industrial \| Commercial and Industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Number of Contracts \| contract	98	101	238	216
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 78	$ 39	$ 146	$ 74
Commercial and industrial \| Commercial and Industrial \| Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Commercial and industrial \| Commercial and Industrial \| Amortization or maturity date change
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	26	39	88	74
Commercial and industrial \| Commercial and Industrial \| Chapter 7 bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Commercial and industrial \| Commercial and Industrial \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 52	$ 0	$ 58	$ 0
Commercial and industrial \| Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Number of Contracts \| contract	2	6	9	14
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 1	$ 2	$ 3	$ 11
Commercial and industrial \| Commercial Real Estate \| Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Commercial and industrial \| Commercial Real Estate \| Amortization or maturity date change
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	1	2	3	11
Commercial and industrial \| Commercial Real Estate \| Chapter 7 bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Commercial and industrial \| Commercial Real Estate \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0	$ 0	$ 0
Consumer \| Automobile
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Number of Contracts \| contract	1,058	650	1,856	1,394
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 16	$ 6	$ 24	$ 13
Consumer \| Automobile \| Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Consumer \| Automobile \| Amortization or maturity date change
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	14	4	20	9
Consumer \| Automobile \| Chapter 7 bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	2	2	4	4
Consumer \| Automobile \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0	$ 0	$ 0
Consumer \| Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Number of Contracts \| contract	63	68	126	172
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 3	$ 3	$ 6	$ 8
Consumer \| Home equity \| Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Consumer \| Home equity \| Amortization or maturity date change
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	2	2	3	5
Consumer \| Home equity \| Chapter 7 bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	1	1	3	3
Consumer \| Home equity \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0	$ 0	$ 0
Consumer \| Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Number of Contracts \| contract	105	96	206	172
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 14	$ 11	$ 25	$ 19
Consumer \| Residential Mortgage \| Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Consumer \| Residential Mortgage \| Amortization or maturity date change
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	12	10	21	18
Consumer \| Residential Mortgage \| Chapter 7 bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	2	1	4	1
Consumer \| Residential Mortgage \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0	$ 0	$ 0
Consumer \| RV and marine
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Number of Contracts \| contract	68	31	96	67
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 3	$ 2	$ 4	$ 1
Consumer \| RV and marine \| Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Consumer \| RV and marine \| Amortization or maturity date change
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	3	0	4	0
Consumer \| RV and marine \| Chapter 7 bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	2	0	1
Consumer \| RV and marine \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0	$ 0	$ 0
Consumer \| Other Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Number of Contracts \| contract	142	343	391	587
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 1	$ 2	$ 2	$ 3
Consumer \| Other Consumer \| Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	1	2	2	3
Consumer \| Other Consumer \| Amortization or maturity date change
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Consumer \| Other Consumer \| Chapter 7 bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	0	0	0	0
Consumer \| Other Consumer \| Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance	$ 0	$ 0	$ 0	$ 0

ALLOWANCE FOR CREDIT LOSSES A_2

ALLOWANCE FOR CREDIT LOSSES ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax	$ (306)		$ (306)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	0		$ 0
Document Period End Date			Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total ALLL balance	1,702	$ 774	$ 1,702	$ 774	$ 1,504		$ 783	$ 764	$ 772
Financing Receivable, Allowance for Credit Loss, Writeoff	(123)	(70)	(259)	(167)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	16	22	35	48
Provision For (Reduction In Allowance) Loan and Lease Losses.	305	58	752	121
Provision (reduction in allowance) for unfunded loan commitments and letters of credit	22	1	16	5
Additions to Unfunded Loan Commitments and Letters of Credit Allowance	(2)		(3)
AULC Balance	119	101	119	101	99		104	100	96
Acl Balance End Of Period	1,821	875	1,821	875		$ 887
Allowance for credit loss, change since adoption	934
Total ALLL balance	1,702	774	1,702	774	1,504		783	764	772
ALLL [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax						(391)
AULC [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax						(2)
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total ALLL balance	533	214	533	214	508		231	219	230
Financing Receivable, Allowance for Credit Loss, Writeoff	(39)	(46)	(87)	(97)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	12	16	26	29
Provision For (Reduction In Allowance) Loan and Lease Losses.	52	25	152	52
Provision (reduction in allowance) for unfunded loan commitments and letters of credit	(3)	0	36	0
Additions to Unfunded Loan Commitments and Letters of Credit Allowance	0		0
AULC Balance	38	2	38	2	41		2	2	2
Acl Balance End Of Period	571	216	571	216
Total ALLL balance	533	214	533	214	508		231	219	230
Consumer \| ALLL [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax						211
Consumer \| AULC [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax						0
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Total ALLL balance	1,169	560	1,169	560	996		552	545	542
Financing Receivable, Allowance for Credit Loss, Writeoff	(84)	(24)	(172)	(70)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	4	6	9	19
Provision For (Reduction In Allowance) Loan and Lease Losses.	253	33	600	69
Provision (reduction in allowance) for unfunded loan commitments and letters of credit	25	1	(20)	5
Additions to Unfunded Loan Commitments and Letters of Credit Allowance	(2)		(3)
AULC Balance	81	99	81	99	58		102	98	94
Acl Balance End Of Period	1,250	659	1,250	659
Total ALLL balance	1,169	$ 560	1,169	$ 560	$ 996		$ 552	$ 545	$ 542
Commercial and industrial \| ALLL [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax						(180)
Commercial and industrial \| AULC [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative-effect of change in accounting principle for financial instruments - credit losses (ASU 2016-13), net of tax						(2)
Cumulative Effect Period Of Adoption Adjustment Member [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability						(393)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable Allowance For Credit Loss Off Balance Sheet Credit Loss Liability						(2)
Cumulative Effect Period Of Adoption Adjustment Member [Member] \| Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability						(211)
Cumulative Effect Period Of Adoption Adjustment Member [Member] \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Allowance For Credit Loss Including Off Balance Sheet Credit Loss Liability						(180)
Retained Earnings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ (306)		$ (306)
Retained Earnings [Member] \| Accounting Standards Update 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets						306
Cumulative Effect Of New Accounting Principle In Period Of Adoption Deferred Taxes						$ 87

MORTGAGE LOAN SALES AND SERVI_3

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Narrative (Details) - Residential Mortgage - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Servicing Assets at Fair Value [Line Items]
Servicing income	$ 14	$ 16
Unpaid principal balance of third party serviced loans	$ 23,200		$ 22,400

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		6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Servicing Asset at Amortized Cost [Line Items]
Loans sold with servicing retained	$ 2,287	$ 954	$ 3,715	$ 1,787
Pretax gains resulting from above loan sales	$ 59	$ 23	$ 98	$ 35

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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jan. 01, 2020	Jun. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]
Fair value, beginning of period	$ 165	$ 10	$ 7	$ 10
Servicing Asset at Fair Value, Additions	26	0	40	0
Time decay	(2)	0	(4)	0
Servicing Asset At Fair Value Payoffs	(10)	0	(16)	0
Changes in valuation inputs or assumptions (less than)	(7)	(1)	(60)	(1)
Fair value, end of period:	$ 165	$ 10	$ 7	$ 10	$ 172	$ 205	$ 9
Fair value method
Servicing Asset at Fair Value, Amount [Roll Forward]
Weighted-average life (years)	6 years 6 months	6 years 4 months 24 days	6 years 6 months	6 years 4 months 24 days

MORTGAGE LOAN SALES AND SERVI_6

MORTGAGE LOAN SALES AND SERVICING RIGHTS MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Fair Value Method Key Assumptions (Details) - Fair value method - Residential Mortgage - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]
Constant prepayment rate (annualized), actual	17.32%	8.21%
Constant prepayment rate (annualized), 10% adverse change	$ (9)	$ 0
Constant prepayment rate (annualized), 20% adverse change	(17)	0
Spread over forward interest rate swap rates, 10% adverse change	(5)	$ 0
Spread over forward interest rate swap rates, 20% adverse change	$ (9)		$ 0

LONG-TERM DEBT (Details)

LONG-TERM DEBT (Details) - Senior Notes - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jan. 28, 2020
Huntington National Bank Senior Note Due February 2023, 1.8 Percent [Member]
Debt Instrument [Line Items]
Debt face amount		$ 500
Debt percent of value	99.916%
Debt stated interest rate		1.80%
Debt Instrument, Redemption Price, Percentage	100.00%
Huntington National Bank Senior Note Due February 4, 2030 2.550 Percent [Member]
Debt Instrument [Line Items]
Debt face amount		$ 750
Debt percent of value	99.597%
Debt stated interest rate		2.55%
Debt Instrument, Redemption Price, Percentage	100.00%

OTHER COMPREHENSIVE INCOME - Ac

OTHER COMPREHENSIVE INCOME - Activity (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pretax
Other comprehensive income (loss), pretax	$ 82	$ 233		$ 701	$ 430
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit	(19)	(51)		(155)	(94)
After-tax
Other comprehensive income, net of tax	63	182	$ 182	546	336
Other comprehensive income before reclassifications	55		174	532	324
Period change	63		182	546	336
Unrealized gains and (losses) on debt securities \| Debt Securities
Pretax
Other comprehensive income (loss), before reclassifications, before tax	57	163		274	347
Reclassification adjustment, before tax	23	9		28	13
Tax (Expense) Benefit
Other comprehensive income (loss) before reclassifications, tax	(13)	(36)		(61)	(77)
Reclassification adjustment, tax	(5)	(2)		(6)	(3)
After-tax
Other comprehensive income (loss), before reclassifications, net of tax	44	127		213	270
Reclassification adjustment, net of tax	18	7		22	10
Other comprehensive income, net of tax	62	134		235	280
Other comprehensive income before reclassifications	44		127	213	270
Period change	62		134	235	280
AOCI Attributable to Parent [Member]
After-tax
Other comprehensive income, net of tax	63		182	546	336
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] \| Equity Securities [Member]
After-tax
Other comprehensive income before reclassifications	11		47	319	54
Period change	11			319	54
Unrealized gains and (losses) on debt securities and Accumulated OTTI \| Debt Securities
Pretax
Other comprehensive income (loss), pretax	80	172		302	360
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit	(18)	(38)		(67)	(80)
Unrealized gains and (losses) on cash flow hedging derivatives
Pretax
Other comprehensive income (loss), pretax	14	60		409	68
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit		(13)		90	(14)
After-tax
Other comprehensive income, net of tax		47		319	54
Accumulated Other Comprehensive Income (Loss), Derivative Qualifying as Hedge, Excluded Component, Including Portion Attributable to Noncontrolling Interest [Member]
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit	(3)
After-tax
Other comprehensive income, net of tax	11
Unrealized gains (losses) for pension and other post- retirement obligations (2)
Pretax
Other comprehensive income (loss), pretax	(12)	1		(10)	2
Tax (Expense) Benefit
Total other comprehensive income (loss), tax (expense) benefit	2	0		2	0
After-tax
Other comprehensive income, net of tax	(10)	$ 1		(8)	2
Other comprehensive income before reclassifications	0		0	0	0
Period change	$ (10)		$ 1	$ (8)	$ 2

OTHER COMPREHENSIVE INCOME OTHE

OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 11,769	$ 11,432	$ 11,795	$ 11,102
Other comprehensive income before reclassifications	55	174	532	324
Amounts reclassified from accumulated OCI to earnings	8	8	14	12
Period change	63	182	546	336
Balance, end of period	12,314	11,668	12,314	11,668
Unrealized gains and (losses) on debt securities \| Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	145	(217)	(28)	(363)
Other comprehensive income before reclassifications	44	127	213	270
Amounts reclassified from accumulated OCI to earnings	18	7	22	10
Period change	62	134	235	280
Balance, end of period	207	(83)	207	(83)
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	331	7
Other comprehensive income before reclassifications	11	47	319	54
Amounts reclassified from accumulated OCI to earnings	0	47	0
Period change	11		319	54
Balance, end of period	342	54	342	54
Unrealized gains and (losses) on cash flow hedging derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			23
Unrealized gains (losses) for pension and other post- retirement obligations (2)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(249)	(245)	(251)	(246)
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from accumulated OCI to earnings	(10)	1	(8)	2
Period change	(10)	1	(8)	2
Balance, end of period	(259)	(244)	(259)	(244)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	227	(455)	(256)	(609)
Balance, end of period	$ 290	$ (273)	290	$ (273)
Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net unrealized loss on securities transfer			$ (81)

SHAREHOLDERS' EQUITY (Details)

SHAREHOLDERS' EQUITY (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020USD ($)shares	Jun. 30, 2020USD ($)Rateshares	Dec. 31, 2019USD ($)shares	May 27, 2020USD ($)$ / shares
Equity, Class of Treasury Stock [Line Items]
Document Period End Date		Jun. 30, 2020
Preferred Stock, Shares Outstanding \| shares	745,500	745,500	740,500
Preferred Stock, Value, Outstanding	$ 1,697,000	$ 1,697,000
Preferred stock	$ 1,697,000	$ 1,697,000	$ 1,203,000
Series B Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Depository Share, Percent Interest in Preferred Stock			0.025
Preferred Stock, Shares Outstanding \| shares	35,500	35,500
Preferred Stock, Value, Outstanding	$ 23,000	$ 23,000
Preferred Stock, Redemption Date		Jan. 15, 2017
Series C Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred Stock, Shares Outstanding \| shares	100,000	100,000
Preferred Stock, Value, Outstanding	$ 100,000	$ 100,000
Preferred Stock, Redemption Date		Jan. 15, 2022
Preferred Stock, Dividend Rate, Percentage \| Rate		5.875%
Series E Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred Stock, Shares Outstanding \| shares	5,000	5,000
Preferred Stock, Value, Outstanding	$ 495,000	$ 495,000
Preferred Stock, Redemption Date		Apr. 15, 2023
Preferred Stock, Dividend Rate, Percentage \| Rate		5.70%
Series D Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred Stock, Shares Outstanding \| shares	400,000	400,000
Preferred Stock, Value, Outstanding	$ 386,000	$ 386,000
Preferred Stock, Redemption Date		Apr. 15, 2021
Preferred Stock, Dividend Rate, Percentage \| Rate		6.25%
Series D Preferred Stock2 [Member]
Equity, Class of Treasury Stock [Line Items]
Preferred Stock, Shares Outstanding \| shares	200,000	200,000
Preferred Stock, Value, Outstanding	$ 199,000	$ 199,000
Preferred Stock, Redemption Date		Apr. 15, 2021
Preferred Stock, Dividend Rate, Percentage \| Rate		6.25%
Series F Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share \| $ / shares				$ 100,000
Depositary Shares, Liquidation Preference Per Share \| $ / shares				$ 1,000
Preferred Stock, Shares Outstanding \| shares	5,000	5,000
Preferred Stock, Value, Outstanding	$ 494,000	$ 494,000
Preferred stock				$ 500,000
Depositary Shares, Issued \| shares	500,000
Preferred Stock, Par or Stated Value Per Share \| $ / shares				$ 0.01
Payments of Stock Issuance Costs	$ 6,000
Preferred Stock, Redemption Date		Jul. 15, 2030
Preferred Stock, Dividend Rate, Percentage	5.625%	5.625%
Preferred Stock, Liquidation Preference, Value	$ 100	$ 100
London Interbank Offered Rate (LIBOR) \| Series B Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred Stock, Basis Spread On Variable Rate	2.70%	2.70%

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic earnings per common share:
Net income	$ 150	$ 364	$ 198	$ 722
Preferred stock dividends	(19)	(18)	(37)	(37)
Net income available to common shareholders	$ 131	$ 346	$ 161	$ 685
Average common shares issued and outstanding (in shares)	1,016,259	1,044,802	1,016,951	1,045,899
Basic earnings per common share (in usd per share)	$ 0.13	$ 0.33	$ 0.16	$ 0.66
Dilutive potential common shares:
Stock options and restricted stock units and awards	7,516	11,308	9,939	13,057
Shares held in deferred compensation plans	4,908	4,170	4,739	4,003
Dilutive potential common shares	12,424	15,478	14,678	17,060
Total diluted average common shares issued and outstanding (in shares)	1,028,683	1,060,280	1,031,629	1,062,959
Diluted earnings per common share (in usd per share)	$ 0.13	$ 0.33	$ 0.16	$ 0.64
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options outstanding to purchase common stock shares having antidilutive effect	17,200	7,656	12,291	6,237

NONINTEREST INCOME - Summary of

NONINTEREST INCOME - Summary of Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Noninterest income from contracts with customers	$ 201	$ 235	$ 428	$ 457
Noninterest income within the scope of other GAAP topics	190	139	324	236
Total noninterest income	$ 391	$ 374	$ 752	$ 693

NONINTEREST INCOME - Disaggrega

NONINTEREST INCOME - Disaggregation by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	$ 201	$ 235	$ 428	$ 457
Noninterest income within the scope of other GAAP topics	190	139	324	236
Noninterest income	391	374	752	693
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	59	92	146	179
Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	55	60	111	113
Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	45	43	92	87
Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	25	23	48	44
Other noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	17	17	31	34
Operating Segments \| Consumer & Business Banking
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	117	154	263	297
Noninterest income within the scope of other GAAP topics	101	44	167	75
Noninterest income	218	198	430	372
Operating Segments \| Consumer & Business Banking \| Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	39	73	107	142
Operating Segments \| Consumer & Business Banking \| Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	52	56	104	106
Operating Segments \| Consumer & Business Banking \| Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	10	8	20	16
Operating Segments \| Consumer & Business Banking \| Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	12	9	20	17
Operating Segments \| Consumer & Business Banking \| Other noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	4	8	12	16
Operating Segments \| Commercial Banking
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	28	27	55	53
Noninterest income within the scope of other GAAP topics	57	62	115	112
Noninterest income	85	89	170	165
Operating Segments \| Commercial Banking \| Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	18	16	35	32
Operating Segments \| Commercial Banking \| Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	3	4	7	7
Operating Segments \| Commercial Banking \| Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	1	2	1
Operating Segments \| Commercial Banking \| Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	1	3	3
Operating Segments \| Commercial Banking \| Other noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	5	5	8	10
Operating Segments \| Vehicle Finance
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	3	3	5
Noninterest income within the scope of other GAAP topics	1	1	2	1
Noninterest income	2	4	5	6
Operating Segments \| Vehicle Finance \| Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	2	2	3
Operating Segments \| Vehicle Finance \| Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0	0	0
Operating Segments \| Vehicle Finance \| Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0	0	0
Operating Segments \| Vehicle Finance \| Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0	0	0
Operating Segments \| Vehicle Finance \| Other noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	1	1	2
Operating Segments \| RBPCG
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	53	48	103	98
Noninterest income within the scope of other GAAP topics	1	1	2	2
Noninterest income	54	49	105	100
Operating Segments \| RBPCG \| Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	1	2	2
Operating Segments \| RBPCG \| Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0	0	0
Operating Segments \| RBPCG \| Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	34	34	70	69
Operating Segments \| RBPCG \| Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	11	12	23	23
Operating Segments \| RBPCG \| Other noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	7	1	8	4
Treasury / Other
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	2	3	4	4
Noninterest income within the scope of other GAAP topics	30	31	38	46
Noninterest income	32	34	42	50
Treasury / Other \| Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0	0	0
Treasury / Other \| Card and payment processing income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0	0	0
Treasury / Other \| Trust and investment management services
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	0	0	0	1
Treasury / Other \| Insurance income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	1	1	2	1
Treasury / Other \| Other noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income from contracts with customers	$ 1	$ 2	$ 2	$ 2

FAIR VALUES OF ASSETS AND LIA_3

FAIR VALUES OF ASSETS AND LIABILITIES - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 954	$ 781
Loans Receivable, Fair Value Disclosure	$ 92	$ 81

FAIR VALUES OF ASSETS AND LIA_4

FAIR VALUES OF ASSETS AND LIABILITIES - Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets measured at fair value on a recurring basis
Loans Held-for-sale, Fair Value Disclosure	$ 954	$ 781
Consumer loans	92	81
Gross amounts of recognized assets	2,321	856
Derivative assets netting	(1,214)	(404)
Net amounts of assets presented in the condensed consolidated balance sheets	1,107	452
Liabilities measured at fair value on a recurring basis
Gross amounts of recognized liabilities	1,279	521
Gross amounts offset in the condensed consolidated balance sheets	(1,107)	(417)
Derivative liabilities	172	104
Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Trading account securities		99
Available-for-sale securities	13,297	14,149
Other securities	56	54
Loans Held-for-sale, Fair Value Disclosure	954	781
MSRs	172	7
Derivative assets netting	(1,214)	(404)
Net amounts of assets presented in the condensed consolidated balance sheets	1,107	452
Liabilities measured at fair value on a recurring basis
Gross amounts offset in the condensed consolidated balance sheets	(1,107)	(417)
Derivative liabilities	172	104
Fair Value, Measurements, Recurring \| Municipal securities
Assets measured at fair value on a recurring basis
Trading account securities	45	63
Available-for-sale securities	3,157	3,055
Fair Value, Measurements, Recurring \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	5	2
Fair Value, Measurements, Recurring \| Other securities
Assets measured at fair value on a recurring basis
Trading account securities		32
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	8	10
Fair Value, Measurements, Recurring \| Federal agencies: Mortgage-backed securities
Assets measured at fair value on a recurring basis
Available-for-sale securities	5,118	5,085
Fair Value, Measurements, Recurring \| Residential Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	3,838	4,222
Fair Value, Measurements, Recurring \| Commercial Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	788	976
Fair Value, Measurements, Recurring \| Other Federal Agencies [Member]
Assets measured at fair value on a recurring basis
Trading account securities		4
Available-for-sale securities	147	165
Fair Value, Measurements, Recurring \| Asset-backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	211	579
Fair Value, Measurements, Recurring \| Corporate Debt Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	21	51
Fair Value, Measurements, Recurring \| Level 1
Assets measured at fair value on a recurring basis
Trading account securities		30
Available-for-sale securities	8	10
Other securities	56	54
Loans Held-for-sale, Fair Value Disclosure	0	0
Consumer loans	0	0
MSRs	0	0
Gross amounts of recognized assets	0	0
Liabilities measured at fair value on a recurring basis
Gross amounts of recognized liabilities	0	0
Fair Value, Measurements, Recurring \| Level 1 \| Municipal 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 1 \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets measured at fair value on a recurring basis
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		30
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	8	10
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 \| Residential Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	0
Fair Value, Measurements, Recurring \| Level 1 \| Commercial Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	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		69
Available-for-sale securities	10,126	11,090
Loans Held-for-sale, Fair Value Disclosure	954	781
Consumer loans	67	55
MSRs	0	0
Gross amounts of recognized assets	2,278	848
Liabilities measured at fair value on a recurring basis
Gross amounts of recognized liabilities	1,276	519
Fair Value, Measurements, Recurring \| Level 2 \| Municipal securities
Assets measured at fair value on a recurring basis
Trading account securities	45	63
Available-for-sale securities	55	56
Fair Value, Measurements, Recurring \| Level 2 \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Level 2 \| Other securities
Assets measured at fair value on a recurring basis
Trading account securities		2
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	5,118	5,085
Fair Value, Measurements, Recurring \| Level 2 \| Residential Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	3,838	4,222
Fair Value, Measurements, Recurring \| Level 2 \| Commercial Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	788	976
Fair Value, Measurements, Recurring \| Level 2 \| Other Federal Agencies [Member]
Assets measured at fair value on a recurring basis
Trading account securities		4
Available-for-sale securities	147	165
Fair Value, Measurements, Recurring \| Level 2 \| Asset-backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	155	531
Fair Value, Measurements, Recurring \| Level 2 \| Corporate Debt Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	21	51
Fair Value, Measurements, Recurring \| Level 3
Assets measured at fair value on a recurring basis
Trading account securities		0
Available-for-sale securities	3,163	3,049
Loans Held-for-sale, Fair Value Disclosure	0	0
Consumer loans	25	26
MSRs	172	7
Gross amounts of recognized assets	43	8
Liabilities measured at fair value on a recurring basis
Gross amounts of recognized liabilities	3	2
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	3,102	2,999
Fair Value, Measurements, Recurring \| Level 3 \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	5	2
Fair Value, Measurements, Recurring \| Level 3 \| Other securities
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 \| 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 \| Residential Mortgage Backed Securities [Member]
Assets measured at fair value on a recurring basis
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Level 3 \| Commercial Mortgage Backed Securities [Member]
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	56	48
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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs					$ 40		$ 6	$ 9	$ (2)
Assets Level 3 Roll Forward:
Transfers into Level 3			$ 0
Transfers out of Level 3 (1)			(75)	$ (24)
Total gains/losses for the period:
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings			109	31
Included in OCI	$ (20)		2
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)			0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases			0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements			0	0
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)			34	(6)
MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0	0
Assets Level 3 Roll Forward:
Opening balance	165	$ 10	7	10
Transfers out of Level 3 (1)	0	0
Total gains/losses for the period:
Included in earnings	7	(1)	(40)	(1)
Included in OCI	0	0	0	0
Purchases/originations	0	0	0	0
Repayments	0	0	0	0
Settlements	0	0	0	0
Closing balance	165	10	7	10	172	$ 205	7	9	10
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	7	(1)	(40)	(1)
Derivative instruments
Assets Level 3 Roll Forward:
Opening balance	39	5
Transfers out of Level 3 (1)	(55)	(15)
Total gains/losses for the period:
Included in earnings	(56)	(19)
Included in OCI	0	0
Purchases/originations	0	0
Repayments	0	0	0	0
Settlements	0	0
Closing balance	39	5			40			9
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	0	4
Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0	0
Assets Level 3 Roll Forward:
Opening balance	2,937	3,237	2,999	3,165
Transfers out of Level 3 (1)	0	0
Total gains/losses for the period:
Included in earnings	0	(1)	(1)	0
Included in OCI	69	3	1	46
Purchases/originations	264	28	338	108
Repayments	0	0	0	0
Settlements	(168)	(65)	(235)	(117)
Closing balance	2,937	3,237	2,999	3,165	3,102		2,999	3,202	3,165
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	0	0	0	0
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Assets Level 3 Roll Forward:
Opening balance	2		2
Transfers out of Level 3 (1)	0
Total gains/losses for the period:
Included in earnings	0
Included in OCI	0
Purchases/originations	3
Repayments	0
Settlements	0
Closing balance	2		2		5		2
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	0
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 Transfers Into Level 3			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0
Assets Level 3 Roll Forward:
Opening balance	69		48
Transfers out of Level 3 (1)	0
Total gains/losses for the period:
Included in earnings	0		0
Included in OCI	0		0
Purchases/originations	0		28
Repayments	0		0
Settlements	(13)		(20)
Closing balance	69		48		56		48
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	0		0
Automobile
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0
Real Estate Loan [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0	0
Assets Level 3 Roll Forward:
Opening balance	26	29	26	30
Transfers out of Level 3 (1)	0	0
Total gains/losses for the period:
Included in earnings	0	0	0	0
Included in OCI	0	0	0	0
Purchases/originations	0	0	0	0
Repayments	(1)	(1)	(1)	(2)
Settlements	0	0	0	0
Closing balance	26	29	26	30	25		26	$ 28	$ 30
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date	$ 0	$ 0	$ 0	$ 0
Fair Value, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities					13,297		14,149
Fair Value, Recurring [Member] \| Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities					788		976
Fair Value, Recurring [Member] \| Residential Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities					3,838		4,222
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities					10,126		11,090
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities					788		976
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Residential Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities					$ 3,838		$ 4,222

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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings			$ 109	$ 31
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	$ 7	$ (1)	(40)	(1)
Mortgage banking income	(7)	1
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	7	(1)
Fair Value Assets Measured On Recurring Basis Gain Loss Included In Interest and fee income	0	0
Derivative Financial Instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage banking income	(56)	(19)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(56)	(19)
Fair Value Assets Measured On Recurring Basis Gain Loss Included In Interest and fee income	0	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	0	(1)	(1)	0
Mortgage banking income	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	$ (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	0		0
Mortgage banking income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings			109	31
Mortgage banking income \| 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			(40)	(1)
Mortgage banking income \| 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			$ 0	0
Interest and Fee Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings	0			0
Interest and Fee Income [Member] \| 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			0
Interest and Fee Income [Member] \| 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)			$ 0

FAIR VALUES OF ASSETS AND LIA_7

FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 954	$ 781
Loans Receivable, Fair Value Disclosure	92	81
Fair Value, Measurements, Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Fair Value Disclosure	954	781
Fair Value, Measurements, Recurring \| Mortgages Held For Sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held For Sale Unpaid Principal	906	755
Difference	(48)	(26)
Fair Value, Measurements, Recurring \| Mortgages Held To Maturity
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Receivable, Fair Value Disclosure	92	81
Loans Held To Maturity Unpaid Principal	97	87
Difference	(5)	(6)
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	1	2
Loans Held For Sale Unpaid Principal	1	2
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	4	3
Loans Held To Maturity Unpaid Principal	4	4
Difference	$ 0	$ (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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Measurements, Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gains (losses) from fair value changes	$ 3	$ 8	$ 22	$ 6

FAIR VALUES OF ASSETS AND LIA_9

FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	[1]	$ 1,165	$ 877
Long-term debt		9,753	9,849
Held-to-maturity securities		9,416	9,070
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		78,437	74,621
Loans Held-for-sale, Fair Value Disclosure		(954)	(781)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI		45	99
Loans held for sale		1,167	879
Available-for-sale securities		13,297	14,149
Long-term debt		9,992	10,075
Held-to-maturity securities		9,856	9,186
Other Securities		438	441
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		79,502	75,177
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		0	30
Loans held for sale		0	0
Available-for-sale securities		8	10
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		45	69
Loans held for sale		954	781
Available-for-sale securities		10,126	11,090
Long-term debt		9,374	9,439
Held-to-maturity securities		9,856	9,186
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		67	55
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		213	98
Available-for-sale securities		3,163	3,049
Long-term debt		618	636
Held-to-maturity securities		0	0
Assets measured at fair value on a nonrecurring basis
Net loans and direct financing leases		79,435	75,122
Nonrecurring Basis
Assets measured at fair value on a nonrecurring basis
Collateral-dependent loans			(26)
Nonrecurring Basis \| Fair Value
Assets measured at fair value on a nonrecurring basis
Collateral-dependent loans		(116)
Loans Held-for-sale, Fair Value Disclosure		(76)
Nonrecurring Basis \| Total Gains/(Losses)
Assets measured at fair value on a nonrecurring basis
Collateral-dependent loans		(38)
Loans Held-for-sale, Fair Value Disclosure		(45)
Nonrecurring Basis \| Level 1 \| Fair Value
Assets measured at fair value on a nonrecurring basis
Collateral-dependent loans		0
Nonrecurring Basis \| Level 2 \| Fair Value
Assets measured at fair value on a nonrecurring basis
Collateral-dependent loans		0
Nonrecurring Basis \| Level 3
Assets measured at fair value on a nonrecurring basis
MSRs			$ 206
Nonrecurring Basis \| Level 3 \| Fair Value
Assets measured at fair value on a nonrecurring basis
Collateral-dependent loans		(116)
Loans Held-for-sale, Fair Value Disclosure		$ (76)

[1]	(1) Amounts represent loans for which Huntington has elected the fair value option. See Note 12 “ Fair Values of Assets and Liabilities ”.

FAIR VALUES OF ASSETS AND LI_10

FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details) $ in Millions	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Fair Value Disclosures [Abstract]
Gross amounts of recognized assets	$ 2,321	$ 856
Derivative Liability, Fair Value, Gross Liability	1,279	521
Consumer loans	92	81
Loans Held-for-sale, Fair Value Disclosure	954	781
Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
MSRs	172	7
Available-for-sale securities	13,297	14,149
Loans Held-for-sale, Fair Value Disclosure	954	781
Fair Value, Measurements, Nonrecurring
Fair Value Disclosures [Abstract]
Impaired loans Fair Value Disclosure		26
Level 3 \| Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
MSRs	172	7
Gross amounts of recognized assets	43	8
Derivative Liability, Fair Value, Gross Liability	3	2
Available-for-sale securities	3,163	3,049
Consumer loans	25	26
Loans Held-for-sale, Fair Value Disclosure	0	0
Level 3 \| Fair Value, Measurements, Nonrecurring
Fair Value Disclosures [Abstract]
MSRs		206
Residential Mortgage Backed Securities [Member] \| Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	3,838	4,222
Residential Mortgage Backed Securities [Member] \| Level 3 \| Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	$ 0	$ 0
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]
Servicing Asset, Measurement Input	0.26	0.26
Residential Mortgage Backed Securities [Member] \| Maximum \| Valuation Technique, Discounted Cash Flow [Member] \| Level 3 \| Measurement Input, Constant Prepayment Rate [Member] \| Fair Value, Measurements, Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Servicing Asset, Measurement Input		0.31
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]
Servicing Asset, Measurement Input	0.11	0.11
Residential Mortgage Backed Securities [Member] \| Maximum \| Valuation Technique, Discounted Cash Flow [Member] \| Level 3 \| Measurement Input, Option Adjusted Spread [Member] \| Fair Value, Measurements, Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Servicing Asset, Measurement Input		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]
Servicing Asset, Measurement Input	0.10	0
Residential Mortgage Backed Securities [Member] \| Minimum \| Valuation Technique, Discounted Cash Flow [Member] \| Level 3 \| Measurement Input, Constant Prepayment Rate [Member] \| Fair Value, Measurements, Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Servicing Asset, Measurement Input		0.10
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]
Servicing Asset, Measurement Input	0.05	0.05
Residential Mortgage Backed Securities [Member] \| Minimum \| Valuation Technique, Discounted Cash Flow [Member] \| Level 3 \| Measurement Input, Option Adjusted Spread [Member] \| Fair Value, Measurements, Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Servicing Asset, Measurement Input		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]
Servicing Asset, Measurement Input	0.17	0.08
Residential Mortgage Backed Securities [Member] \| Weighted Average \| Valuation Technique, Discounted Cash Flow [Member] \| Level 3 \| Measurement Input, Constant Prepayment Rate [Member] \| Fair Value, Measurements, Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Servicing Asset, Measurement Input		0.12
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]
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, Nonrecurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Servicing Asset, Measurement Input		0.09
Asset-backed Securities [Member] \| Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	$ 211	$ 579
Asset-backed Securities [Member] \| Level 3 \| Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	56	48
Municipal securities \| Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	3,157	3,055
Municipal securities \| Level 3 \| Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	3,102	2,999
Corporate Debt Securities [Member] \| Fair Value, Measurements, Recurring
Fair Value Disclosures [Abstract]
Available-for-sale securities	21	51
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	0.02	0.03
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	0.80	0.80
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	0.02	0.02
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	0.02	0.02
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	0.04	0.04
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	0.24
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]
Derivative Asset, Measurement Input	0.14	0.11
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]
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]
Derivative Asset, Measurement Input	(0.03)	(0.02)
Fair Value Disclosures [Abstract]
Loans held for investment, Measurement Input	0.04
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]
Derivative Asset, Measurement Input	0.04	0.02
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]
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]
Derivative Asset, Measurement Input		0.91

FAIR VALUES OF ASSETS AND LI_11

FAIR VALUES OF ASSETS AND LIABILITIES - Balance Sheet Location (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Financial Assets:
Held-to-maturity securities		$ 9,416	$ 9,070
Loans held for sale	[1]	1,165	877
Net loans and direct financing leases		78,437	74,621
Derivatives		1,107	452
Derivative Asset, Fair Value, Gross Asset		2,321	856
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(1,214)	(404)
Financial Liabilities:
Deposits		93,691	82,347
Short-term borrowings		146	2,606
Long-term borrowings		9,753	9,849
Derivatives		172	104
Derivative Liability, Fair Value, Gross Liability		1,279	521
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(1,107)	(417)
Reported Value Measurement [Member]
Financial Assets:
Cash and short term assets		6,375	1,272
Trading account securities		45	99
Available-for-sale securities		13,297	14,149
Held-to-maturity securities		9,416	9,070
Other Securities		438	441
Loans held for sale		1,165	877
Net loans and direct financing leases		78,437	74,621
Derivatives		1,107	452
Financial Liabilities:
Deposits		93,691	82,347
Short-term borrowings		146	2,606
Long-term borrowings		9,753	9,849
Derivatives		172	104
Estimate of Fair Value Measurement [Member]
Financial Assets:
Cash and short term assets		6,375	1,272
Trading account securities		45	99
Available-for-sale securities		13,297	14,149
Held-to-maturity securities		9,856	9,186
Other Securities		438	441
Loans held for sale		1,167	879
Other securities (2)		56	54
Net loans and direct financing leases		79,502	75,177
Derivatives		1,107	452
Financial Liabilities:
Deposits		93,702	82,344
Short-term borrowings		146	2,606
Long-term borrowings		9,992	10,075
Derivatives		172	104
Estimate of Fair Value Measurement [Member] \| Level 1
Financial Assets:
Trading account securities		0	30
Available-for-sale securities		8	10
Held-to-maturity securities		0	0
Loans held for sale		0	0
Other securities (2)		56	54
Net loans and direct financing leases		0	0
Financial Liabilities:
Deposits		0	0
Short-term borrowings		0	0
Long-term borrowings		0	0
Estimate of Fair Value Measurement [Member] \| Level 2
Financial Assets:
Trading account securities		45	69
Available-for-sale securities		10,126	11,090
Held-to-maturity securities		9,856	9,186
Loans held for sale		954	781
Other securities (2)		0	0
Net loans and direct financing leases		67	55
Derivative Asset, Fair Value, Gross Asset		2,278	848
Financial Liabilities:
Deposits		90,153	76,790
Short-term borrowings		0	0
Long-term borrowings		9,374	9,439
Derivative Liability, Fair Value, Gross Liability		1,276	519
Estimate of Fair Value Measurement [Member] \| Level 3
Financial Assets:
Trading account securities		0	0
Available-for-sale securities		3,163	3,049
Held-to-maturity securities		0	0
Loans held for sale		213	98
Other securities (2)		0	0
Net loans and direct financing leases		79,435	75,122
Derivative Asset, Fair Value, Gross Asset		43	8
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		1,214	404
Financial Liabilities:
Deposits		3,549	5,554
Short-term borrowings		146	2,606
Long-term borrowings		618	636
Derivative Liability, Fair Value, Gross Liability		3	2
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(1,107)	(417)
Fair Value, Recurring [Member]
Financial Assets:
Trading account securities			99
Available-for-sale securities		13,297	14,149
Derivatives		1,107	452
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(1,214)	(404)
Financial Liabilities:
Derivatives		172	104
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(1,107)	(417)
Fair Value, Recurring [Member] \| Level 1
Financial Assets:
Trading account securities			30
Available-for-sale securities		8	10
Derivative Asset, Fair Value, Gross Asset		0	0
Financial Liabilities:
Derivative Liability, Fair Value, Gross Liability		0	0
Fair Value, Recurring [Member] \| Level 2
Financial Assets:
Trading account securities			69
Available-for-sale securities		10,126	11,090
Derivative Asset, Fair Value, Gross Asset		2,278	848
Financial Liabilities:
Derivative Liability, Fair Value, Gross Liability		1,276	519
Fair Value, Recurring [Member] \| Level 3
Financial Assets:
Trading account securities			0
Available-for-sale securities		3,163	3,049
Derivative Asset, Fair Value, Gross Asset		43	8
Financial Liabilities:
Derivative Liability, Fair Value, Gross Liability		3	2
Other securities \| Fair Value, Recurring [Member]
Financial Assets:
Trading account securities			32
Available-for-sale securities		4	4
Other securities \| Fair Value, Recurring [Member] \| Level 1
Financial Assets:
Trading account securities			30
Available-for-sale securities		0	0
Other securities \| Fair Value, Recurring [Member] \| Level 2
Financial Assets:
Trading account securities			2
Available-for-sale securities		4	4
Other securities \| Fair Value, Recurring [Member] \| Level 3
Financial Assets:
Trading account securities			0
Available-for-sale securities		0	0
Amortized Cost [Member] \| Reported Value Measurement [Member]
Financial Assets:
Cash and short term assets		6,375	1,272
Held-to-maturity securities		9,416	9,070
Other Securities		382	387
Net loans and direct financing leases		78,345	74,540
Financial Liabilities:
Deposits		93,691	82,347
Short-term borrowings		146	2,606
Long-term borrowings		9,753	9,849
Fair Value Fair Value Option [Member] \| Reported Value Measurement [Member]
Financial Assets:
Trading account securities		45	99
Available-for-sale securities		13,297	14,149
Other Securities		56	54
Loans held for sale		954	781
Net loans and direct financing leases		92	81
Derivatives		1,107	452
Financial Liabilities:
Derivatives		172	104
LowerOfCostOrMarket [Member] \| Reported Value Measurement [Member]
Financial Assets:
Loans held for sale		$ 211	$ 96

[1]	(1) Amounts represent loans for which Huntington has elected the fair value option. See Note 12 “ Fair Values of Assets and Liabilities ”.

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020USD ($)group	Dec. 31, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Derivative [Line Items]
Increase (decrease) to net interest income due to derivative adjustment	$ 52	$ (15)	$ 68	$ (29)
Fair value hedging adjustments			(76)		$ (93)
Derivative, Notional Amount	28,819	25,927	28,819		25,927
Credit risks from interest rate swaps used for trading purposes	1,000	407	1,000		407
Derivative Liability	$ 172	104	172		104
Number of primary groups \| group	2
Aggregate credit risk, net of collateral	$ 92	22	92		22
Investment securities and cash collateral pledged by Huntington	231		231
Investment securities and cash collateral pledged to Huntington	441		441
Derivative used in trading activity
Derivative [Line Items]
Net derivative asset (liability)	65	87	65		87
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value	32,000	30,000	32,000		30,000
Derivative used in Mortgage Banking Activities
Derivative [Line Items]
Derivative, Notional Amount	540	778	540		778
Derivative, Fair Value, Net	31	6	31		6
Fair Value Hedging
Derivative [Line Items]
Derivative, Notional Amount	10,444	7,540	10,444		7,540
Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount	18,375	18,387	18,375		18,387
Commitments to Sell Loans [Member]
Derivative [Line Items]
Commitments to sell residential real estate loans	2,300	1,400	2,300		1,400
Loans Payable [Member]
Derivative [Line Items]
Derivative, Notional Amount	18,375	18,375	18,375		18,375
Loans Payable [Member] \| Fair Value Hedging
Derivative [Line Items]
Derivative, Notional Amount	0		0
Loans Payable [Member] \| Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount	$ 18,375	$ 18,375	$ 18,375		$ 18,375

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS - Hedging Instruments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Document Period End Date	Jun. 30, 2020
Derivative, Notional Amount	$ 28,819	$ 25,927
Asset derivatives included in accrued income and other assets
Total contracts	2,321	856
Liability derivatives included in accrued expenses and other liabilities
Total contracts	1,279	521
Accrued income and other assets
Asset derivatives included in accrued income and other assets
Interest rate contracts designated as hedging instruments	975	256
Interest rate contracts not designated as hedging instruments	1,122	420
Foreign exchange contracts not designated as hedging instruments	27	19
Commodities contracts not designated as hedging instruments	197	155
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	6
Total contracts	2,321	856
Accrued expenses and other liabilities
Liability derivatives included in accrued expenses and other liabilities
Interest rate contracts designated as hedging instruments	86	36
Interest rate contracts not designated as hedging instruments	951	314
Foreign exchange contracts not designated as hedging instruments	27	18
Commodities contracts not designated as hedging instruments	193	152
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	22	1
Total contracts	1,279	521
Designated as Hedging Instrument [Member] \| Accrued income and other assets
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	28,819	25,927
Not Designated as Hedging Instrument [Member] \| Accrued income and other assets
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	65,693	59,161
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Accrued income and other assets
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	32,025	27,614
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Accrued income and other assets
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,093	2,173
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Accrued income and other assets
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,278	3,020
Not Designated as Hedging Instrument [Member] \| Equity Contract [Member] \| Accrued income and other assets
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 478	$ 427

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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 24	$ 48	$ 104	$ 71
Interest Rate Contract [Member] \| Capital markets fees
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	12	12	29	22
Interest Rate Contract [Member] \| Mortgage banking income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	6	22	63	34
Interest Rate Floor [Member] \| Other noninterest expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	5	0	5
Foreign Exchange Contract [Member] \| Capital markets fees
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	6	7	12	15
Commodity Contract [Member] \| Capital markets fees
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1	2	3	(4)
Equity Contract [Member] \| Other noninterest expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (1)	$ 0	$ (3)	$ (1)

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Credit Derivatives [Line Items]
Document Period End Date	Jun. 30, 2020
Notional Disclosures [Abstract]
Derivative, Notional Amount	$ 28,819	$ 25,927
Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	10,444	7,540
Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	18,375	18,387
Loans Payable [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	18,375	18,375
Loans Payable [Member] \| Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	0
Loans Payable [Member] \| Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	18,375	18,375
Securities Investment [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	2,950	12
Securities Investment [Member] \| Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	2,950	0
Securities Investment [Member] \| Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	0	12
Other long-term debt
Notional Disclosures [Abstract]
Derivative, Notional Amount	7,494	7,540
Other long-term debt \| Fair Value Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	7,494	7,540
Other long-term debt \| Cash Flow Hedging
Notional Disclosures [Abstract]
Derivative, Notional Amount	$ 0	$ 0

DERIVATIVE FINANCIAL INSTRUME_7

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management Add Info (Details Add Info) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Derivative, Notional Amount	$ 28,819	$ 25,927	$ 28,819
Increase decrease to net interest income due to derivative adjustment	$ 52	$ (15)	$ 68	$ (29)

DERIVATIVE FINANCIAL INSTRUME_8

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Asset, Fair Value Hedge, Last-of-Layer, Amount	$ 3,000		$ 3,000
Document Period End Date			Jun. 30, 2020
Fair value hedging adjustments			$ 76		$ 93
Fair Value Hedge Liabilities	14,815		14,815		7,578
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	310		310		114
Investment Securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Hedge Liabilities	7,573		7,573		0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	1		1		0
Subordinated notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Hedge Liabilities	7,242		7,242		7,578
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	309		309		$ 114
Interest income available for sale securities taxable [Member] \| Investment Securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	(1)	$ 0	(1)	$ 0
Interest income available for sale securities taxable [Member] \| Hedged investment securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	1	0	1	0
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	(5)	88	196	129
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	$ (4)	$ (88)	$ (195)	$ (129)

DERIVATIVE FINANCIAL INSTRUME_9

DERIVATIVE FINANCIAL INSTRUMENTS DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness	$ 11	$ 47	$ 319	$ 54
Derivative, Notional Amount	28,819		28,819		$ 25,927
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	18,375		18,375		18,387
Loans Payable [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	18,375		18,375		18,375
Loans Payable [Member] \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 18,375		$ 18,375		$ 18,375

DERIVATIVE FINANCIAL INSTRUM_10

DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Document Period End Date			Jun. 30, 2020
Derivative, Notional Amount	$ 28,819	$ 25,927	$ 28,819	$ 25,927
Derivative used in Mortgage Banking Activities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net	31	6	31	6
Derivative, Notional Amount	540	778	540	778
Trading Assets	69	19	69	19
Derivative, Gain (Loss) on Derivative, Net	$ 6	$ 18	$ 63	$ 25

DERIVATIVE FINANCIAL INSTRUM_11

DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized assets	$ 2,321	$ 856
Gross amounts offset in the condensed consolidated balance sheets	1,214	404
Net amounts of assets presented in the condensed consolidated balance sheets	1,107	452
Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments	(129)	(65)
Gross amounts not offset in the condensed consolidated balance sheets, cash collateral received	(59)	(29)
Net amount	$ 919	$ 358

DERIVATIVE FINANCIAL INSTRUM_12

DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized liabilities	$ 1,279	$ 521
Gross amounts offset in the condensed consolidated balance sheets	(1,107)	(417)
Derivative liabilities	172	104
Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments	(40)	0
Gross amounts not offset in the condensed consolidated balance sheets, Cash collateral received	(28)	(75)
Net amount	$ 104	$ 29

VIEs - Narrative (Details)

VIEs - Narrative (Details)	3 Months Ended
VIEs - Narrative (Details)	Jun. 30, 2020
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	Jun. 30, 2020	Dec. 31, 2019
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	858	727
Total Liabilities	432	332
Maximum Exposure to Loss	858	727
Other Investments
Variable Interest Entity [Line Items]
Total Assets	220	179
Total Liabilities	59	63
Maximum Exposure to Loss	220	179
Total
Variable Interest Entity [Line Items]
Total Assets	1,092	920
Total Liabilities	743	647
Maximum Exposure to Loss	$ 1,078	$ 906

VIEs - Trust preferred Securiti

VIEs - Trust preferred Securities (Details) $ in Millions	3 Months Ended
VIEs - Trust preferred Securities (Details) $ in Millions	Jun. 30, 2020USD ($)
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	1.00%
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	0.93%
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	1.70%
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	1.70%
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	1.63%
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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Low Income Housing Tax Credit Partnerships
Variable Interest Entity [Line Items]
Affordable housing tax credit investments	$ 1,423		$ 1,423		$ 1,242
Less: amortization	(565)		(565)		(515)
Net affordable housing tax credit investments	858		858		727
Unfunded commitments	432		432		$ 332
Tax credits and other tax benefits recognized	30	$ 26	59	$ 53
Proportional Amortization Method
Variable Interest Entity [Line Items]
Proportional amortization expense included in provision for income taxes	$ 25	$ 22	$ 50	$ 44

COMMITMENTS AND CONTINGENT LI_3

COMMITMENTS AND CONTINGENT LIABILITIES - Commitments to Extend Credit (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Commercial
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	$ 20,283	$ 18,326
Consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	14,735	14,831
Commercial Real Estate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	1,261	1,364
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	591	587
Commercial \| Commercial letters-of-credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract amount represents credit risk	$ 20	$ 8

COMMITMENTS AND CONTINGENT LI_4

COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
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	$ 5	$ 8
Outstanding standby letters of credit	591	$ 587
Maximum
Loss Contingencies [Line Items]
Aggregate range of reasonably possible losses current legal proceedings	20
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		6 Months Ended
SEGMENT REPORTING (Details) $ in Millions	Jun. 30, 2020USD ($)segments	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Segment Reporting Information [Line Items]
Number of reporting segments \| segments	4
Net interest income	$ 792	$ 812	$ 1,582	$ 1,634
Provision (reduction in allowance) for credit losses	(327)	(59)	(768)	(126)
Noninterest income	391	374	752	693
Noninterest expense	675	700	1,327	1,353
Provision (benefit) for income taxes	31	63	41	126
Net income	150	364	198	722
Assets	118,425		118,425		$ 109,002
Deposits	93,691		93,691		82,347
Operating Segments \| Consumer & Business Banking
Segment Reporting Information [Line Items]
Net interest income	368	464	733	936
Provision (reduction in allowance) for credit losses	(31)	(30)	(114)	(48)
Noninterest income	218	198	430	372
Noninterest expense	422	427	840	827
Provision (benefit) for income taxes	27	43	44	91
Net income	106	162	165	342
Assets	30,697		30,697		25,073
Deposits	59,202		59,202		51,675
Operating Segments \| Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	240	264	472	536
Provision (reduction in allowance) for credit losses	(226)	(24)	(523)	(67)
Noninterest income	85	89	170	165
Noninterest expense	136	145	265	288
Provision (benefit) for income taxes	(7)	39	(31)	73
Net income	(30)	145	(115)	273
Assets	35,323		35,323		34,337
Deposits	22,041		22,041		20,762
Operating Segments \| Vehicle Finance [Member]
Segment Reporting Information [Line Items]
Net interest income	100	96	206	191
Provision (reduction in allowance) for credit losses	(70)	(5)	(131)	(14)
Noninterest income	2	4	5	6
Noninterest expense	34	38	69	75
Provision (benefit) for income taxes	0	12	2	23
Net income	(2)	45	9	85
Assets	19,137		19,137		20,155
Deposits	824		824		376
Operating Segments \| RBPCG
Segment Reporting Information [Line Items]
Net interest income	40	52	83	104
Provision (reduction in allowance) for credit losses	0	0	0	3
Noninterest income	54	49	105	100
Noninterest expense	62	67	124	130
Provision (benefit) for income taxes	6	7	14	16
Net income	26	27	50	61
Assets	6,855		6,855		6,665
Deposits	6,834		6,834		6,370
Treasury / Other
Segment Reporting Information [Line Items]
Net interest income	44	(64)	88	(133)
Provision (reduction in allowance) for credit losses	0	0	0	0
Noninterest income	32	34	42	50
Noninterest expense	21	23	29	33
Provision (benefit) for income taxes	5	(38)	12	(77)
Net income	50	$ (15)	89	$ (39)
Assets	26,413		26,413		22,772
Deposits	$ 4,790		$ 4,790		$ 3,164