10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

______________________________

FORM 10-Q

______________________________

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2014

Or

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 1-10706

____________________________________________________________________________________

Comerica Incorporated

(Exact name of registrant as specified in its charter)

___________________________________________________________________________________

Delaware	38-1998421
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

Comerica Bank Tower

1717 Main Street, MC 6404

Dallas, Texas 75201

(Address of principal executive offices)

(Zip Code)

(214) 462-6831

(Registrant’s telephone number, including area code)

_________________________________________________________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ý No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ý Accelerated filer o Non-accelerated filer o (Do not check if a smaller reporting company) Smaller reporting company o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No ý

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date.

$5 par value common stock:

Outstanding as of October 24, 2014: 179,686,578 shares

COMERICA INCORPORATED AND SUBSIDIARIES

TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION
ITEM 1. Financial Statements
Consolidated Balance Sheets at September 30, 2014 (unaudited) and December 31, 2013	1
Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2014 and 2013 (unaudited)	2
Consolidated Statements of Changes in Shareholders’ Equity for the Nine Months Ended September 30, 2014 and 2013 (unaudited)	3
Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2014 and 2013 (unaudited)	4
Notes to Consolidated Financial Statements (unaudited)	5
ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	37
ITEM 3. Quantitative and Qualitative Disclosures about Market Risk	65
ITEM 4. Controls and Procedures	65
PART II. OTHER INFORMATION
ITEM 1. Legal Proceedings	65
ITEM 1A. Risk Factors	65
ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds	65
ITEM 6. Exhibits	66
Signature	67

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements

CONSOLIDATED BALANCE SHEETS

Comerica Incorporated and Subsidiaries

(in millions, except share data)	September 30, 2014			December 31, 2013
	(unaudited)
ASSETS
Cash and due from banks	$	1,039		$	1,140
Interest-bearing deposits with banks	6,748			5,311
Other short-term investments	112			112
Investment securities available-for-sale	9,468			9,307
Commercial loans	30,759			28,815
Real estate construction loans	1,992			1,762
Commercial mortgage loans	8,603			8,787
Lease financing	805			845
International loans	1,429			1,327
Residential mortgage loans	1,797			1,697
Consumer loans	2,323			2,237
Total loans	47,708			45,470
Less allowance for loan losses	(592		)	(598		)
Net loans	47,116			44,872
Premises and equipment	524			594
Accrued income and other assets	3,880			3,888
Total assets	$	68,887		$	65,224
LIABILITIES AND SHAREHOLDERS’ EQUITY
Noninterest-bearing deposits	$	27,490		$	23,875
Money market and interest-bearing checking deposits	23,523			22,332
Savings deposits	1,753			1,673
Customer certificates of deposit	4,698			5,063
Foreign office time deposits	117			349
Total interest-bearing deposits	30,091			29,417
Total deposits	57,581			53,292
Short-term borrowings	202			253
Accrued expenses and other liabilities	1,002			986
Medium- and long-term debt	2,669			3,543
Total liabilities	61,454			58,074
Common stock - $5 par value:
Authorized - 325,000,000 shares
Issued - 228,164,824 shares	1,141			1,141
Capital surplus	2,183			2,179
Accumulated other comprehensive loss	(317		)	(391		)
Retained earnings	6,631			6,318
Less cost of common stock in treasury - 47,992,721 shares at 9/30/14 and 45,860,786 shares at 12/31/13	(2,205		)	(2,097		)
Total shareholders’ equity	7,433			7,150
Total liabilities and shareholders’ equity	$	68,887		$	65,224

See notes to consolidated financial statements.

1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited)

Comerica Incorporated and Subsidiaries 

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions, except per share data)	2014			2013			2014			2013
INTEREST INCOME
Interest and fees on loans	$	381		$	381		$	1,142		$	1,159
Interest on investment securities	52			54			160			159
Interest on short-term investments	3			4			9			10
Total interest income	436			439			1,311			1,328
INTEREST EXPENSE
Interest on deposits	11			13			33			43
Interest on medium- and long-term debt	11			14			38			43
Total interest expense	22			27			71			86
Net interest income	414			412			1,240			1,242
Provision for credit losses	5			8			25			37
Net interest income after provision for credit losses	409			404			1,215			1,205
NONINTEREST INCOME
Service charges on deposit accounts	54			53			162			161
Fiduciary income	44			41			133			128
Commercial lending fees	26			28			69			71
Card fees	20			20			59			55
Letter of credit fees	14			17			43			49
Bank-owned life insurance	11			12			31			31
Foreign exchange income	9			9			30			27
Brokerage fees	4			4			13			14
Net securities (losses) gains	(1		)	1			—			(1		)
Other noninterest income	34			43			103			128
Total noninterest income	215			228			643			663
NONINTEREST EXPENSES
Salaries and benefits expense	248			255			735			751
Net occupancy expense	46			41			125			119
Equipment expense	14			15			43			45
Outside processing fee expense	31			31			89			89
Software expense	25			22			72			66
Litigation-related expense	(2		)	(4		)	4			—
FDIC insurance expense	9			9			25			26
Advertising expense	5			6			16			18
Gain on debt redemption	(32		)	—			(32		)	(1		)
Other noninterest expenses	53			42			130			136
Total noninterest expenses	397			417			1,207			1,249
Income before income taxes	227			215			651			619
Provision for income taxes	73			68			207			195
NET INCOME	154			147			444			424
Less income allocated to participating securities	2			2			6			6
Net income attributable to common shares	$	152		$	145		$	438		$	418
Earnings per common share:
Basic	$	0.85		$	0.80		$	2.44		$	2.28
Diluted	0.82			0.78			2.35			2.23
Comprehensive income	141			144			518			296
Cash dividends declared on common stock	36			31			107			95
Cash dividends declared per common share	0.20			0.17			0.59			0.51

See notes to consolidated financial statements.

2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (unaudited)

Comerica Incorporated and Subsidiaries

	Common Stock							Accumulated Other Comprehensive Loss									Total Shareholders’ Equity
(in millions, except per share data)	Shares Outstanding		Amount		Capital Surplus						Retained Earnings			Treasury Stock
BALANCE AT DECEMBER 31, 2012	188.3		$	1,141	$	2,162		$	(413	)	$	5,928		$	(1,879	)	$	6,939
Net income	—		—		—			—			424			—			424
Other comprehensive loss, net of tax	—		—		—			(128		)	—			—			(128		)
Cash dividends declared on common stock ($0.51 per share)	—		—		—			—			(95		)	—			(95		)
Purchase of common stock	(5.8	)	—		—			—			—			(218		)	(218		)
Net issuance of common stock under employee stock plans	1.2		—		(18		)	—			(21		)	56			17
Share-based compensation	—		—		27			—			—			—			27
BALANCE AT SEPTEMBER 30, 2013	183.7		$	1,141	$	2,171		$	(541	)	$	6,236		$	(2,041	)	$	6,966
BALANCE AT DECEMBER 31, 2013	182.3		$	1,141	$	2,179		$	(391	)	$	6,318		$	(2,097	)	$	7,150
Net income	—		—		—			—			444			—			444
Other comprehensive income, net of tax	—		—		—			74			—			—			74
Cash dividends declared on common stock ($0.59 per share)	—		—		—			—			(107		)	—			(107		)
Purchase of common stock	(4.1	)	—		—			—			—			(200		)	(200		)
Net issuance of common stock under employee stock plans	2.0		—		(26		)	—			(24		)	91			41
Share-based compensation	—		—		31			—			—			—			31
Other	—		—		(1		)	—			—			1			—
BALANCE AT SEPTEMBER 30, 2014	180.2		$	1,141	$	2,183		$	(317	)	$	6,631		$	(2,205	)	$	7,433

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)

Comerica Incorporated and Subsidiaries

	Nine Months Ended September 30,
(in millions)	2014			2013
OPERATING ACTIVITIES
Net income	$	444		$	424
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	25			37
Provision (benefit) for deferred income taxes	7			(6		)
Depreciation and amortization	92			92
Net periodic defined benefit cost	29			65
Share-based compensation expense	31			27
Net amortization of securities	9			21
Accretion of loan purchase discount	(25		)	(26		)
Net securities losses	—			1
Net gains on sales of foreclosed property	(3		)	(4		)
Gain on debt redemption	(32		)	(1		)
Excess tax benefits from share-based compensation arrangements	(6		)	(3		)
Net change in:
Trading securities	1			15
Accrued income receivable	(2		)	9
Accrued expenses payable	(44		)	(13		)
Other, net	39			(228		)
Net cash provided by operating activities	565			410
INVESTING ACTIVITIES
Investment securities available-for-sale:
Maturities and redemptions	1,328			2,418
Purchases	(1,413		)	(1,899		)
Net change in loans	(2,254		)	1,864
Proceeds from sales of foreclosed property	13			40
Net increase in premises and equipment	(38		)	(70		)
Sales of Federal Home Loan Bank stock	41			41
Other, net	(4		)	10
Net cash (used in) provided by investing activities	(2,327		)	2,404
FINANCING ACTIVITIES
Net change in:
Deposits	4,205			999
Short-term borrowings	(51		)	116
Medium- and long-term debt:
Maturities and redemptions	(1,406		)	(1,080		)
Issuances	596			—
Common stock:
Repurchases	(200		)	(218		)
Cash dividends paid	(101		)	(92		)
Issuances under employee stock plans	45			22
Excess tax benefits from share-based compensation arrangements	6			3
Other, net	4			(10		)
Net cash provided by (used in) financing activities	3,098			(260		)
Net increase in cash and cash equivalents	1,336			2,554
Cash and cash equivalents at beginning of period	6,451			4,534
Cash and cash equivalents at end of period	$	7,787		$	7,088
Interest paid	$	74		$	88
Income taxes and tax-related interest paid	154			104
Noncash investing and financing activities:
Loans transferred to other real estate	13			10

See notes to consolidated financial statements.

4

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

NOTE 1 - BASIS OF PRESENTATION AND ACCOUNTING POLICIES

Organization

The accompanying unaudited consolidated financial statements were prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation were included. The results of operations for the nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. Certain items in prior periods were reclassified to conform to the current presentation. For further information, refer to the consolidated financial statements and footnotes thereto included in the Annual Report of Comerica Incorporated and Subsidiaries (the Corporation) on Form 10-K for the year ended December 31, 2013.

Allowance for Credit Losses

In the second quarter 2014, the Corporation enhanced the approach used to determine the standard reserve factors used in estimating the allowance for credit losses, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly.

Recently Adopted Accounting Pronouncement

Effective January 1, 2014, the Corporation early adopted Accounting Standards Update (ASU) No. 2014-01, “Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects,” an amendment to GAAP which enables companies that invest in affordable housing projects that qualify for the low-income housing tax credit (LIHTC) to elect to use the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial investment cost of the project is amortized in proportion to the amount of tax credits and other benefits received, with the results of the investment presented on a net basis as a component of the provision for income taxes. Previously, LIHTC investments were accounted for under the cost or equity method, and the amortization was recorded as a reduction to other noninterest income, with the tax credits and other benefits received recorded as a component of the provision for income taxes. The Corporation believes the proportional amortization method better represents the economics of LIHTC investments and provides users with a better understanding of the returns from such investments than the cost or equity method.

The cumulative effect of the retrospective application of the change in amortization method was a $3 million decrease to both "accrued income and other assets" and "retained earnings" on the consolidated balance sheets as of January 1, 2013. The unaudited consolidated financial statements have been retrospectively adjusted to reflect the prior period effect of the adoption of the amendment, which resulted in increases of $14 million and $41 million to both "other noninterest income" and "provision for income taxes" for the three- and nine-month periods ended September 30, 2013, respectively. The adoption of ASU 2014-01 had no effect on net income or earnings per common share for any period presented.

See Note 6 to these unaudited consolidated financial statements for additional information regarding LIHTC and other tax credit investments.

Pending Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous GAAP comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2016, and must be retrospectively applied. Entities will have the option of presenting prior periods as impacted by the new guidance or presenting the cumulative effect of initial application along with supplementary disclosures. Early adoption is prohibited. The Corporation is currently evaluating the impact of adopting ASU 2014-09.

In June 2014, the FASB issued ASU No. 2014-12, “Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” (ASU 2014-12). The new guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. ASU 2014-12 is effective for annual and interim periods beginning after December 15, 2015, with early adoption permitted. The Corporation's current accounting treatment of

5

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

performance conditions for employees who are or become retirement eligible prior to the achievement of the performance target are consistent with ASU 2014-12, and as such does not expect the new guidance to have a material effect on the Corporation’s financial condition and results of operations. The Corporation expects to prospectively adopt ASU 2014-12 in the first quarter 2015.

NOTE 2 – FAIR VALUE MEASUREMENTS

The Corporation utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The determination of fair values of financial instruments often requires the use of estimates. In cases where quoted market values in an active market are not available, the Corporation uses present value techniques and other valuation methods to estimate the fair values of its financial instruments. These valuation methods require considerable judgment and the resulting estimates of fair value can be significantly affected by the assumptions made and methods used.

Fair value is an estimate of the exchange price that would be received to sell an asset or paid to transfer a liability in an orderly transaction (i.e., not a forced transaction, such as a liquidation or distressed sale) between market participants at the measurement date. However, the calculated fair value estimates in many instances cannot be substantiated by comparison to independent markets and, in many cases, may not be realizable in a current sale of the financial instrument.

Trading securities, investment securities available-for-sale, derivatives and deferred compensation plan liabilities are recorded at fair value on a recurring basis. Additionally, from time to time, the Corporation may be required to record other assets and liabilities at fair value on a nonrecurring basis, such as impaired loans, other real estate (primarily foreclosed property), nonmarketable equity securities and certain other assets and liabilities. These nonrecurring fair value adjustments typically involve write-downs of individual assets or application of lower of cost or fair value accounting.

The Corporation categorizes assets and liabilities recorded at fair value on a recurring or nonrecurring basis and the estimated fair value of financial instruments not recorded at fair value on a recurring basis into a three-level hierarchy, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value.

Level 1	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.
Level 3	Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques.

The Corporation generally utilizes third-party pricing services to value Level 1 and Level 2 trading securities and investment securities available-for-sale, as well as certain derivatives designated as fair value hedges. Management reviews the methodologies and assumptions used by the third-party pricing services and evaluates the values provided, principally by comparison with other available market quotes for similar instruments and/or analysis based on internal models using available third-party market data. The Corporation may occasionally adjust certain values provided by the third-party pricing service when management believes, as the result of its review, that the adjusted price most appropriately reflects the fair value of the particular security.

Following are descriptions of the valuation methodologies and key inputs used to measure financial assets and liabilities recorded at fair value, as well as a description of the methods and significant assumptions used to estimate fair value disclosures for financial instruments not recorded at fair value in their entirety on a recurring basis. The descriptions include an indication of the level of the fair value hierarchy in which the assets or liabilities are classified. Transfers of assets or liabilities between levels of the fair value hierarchy are recognized at the beginning of the reporting period, when applicable.

Cash and due from banks, federal funds sold and interest-bearing deposits with banks

Due to their short-term nature, the carrying amount of these instruments approximates the estimated fair value. As such, the Corporation classifies the estimated fair value of these instruments as Level 1.

Trading securities and associated deferred compensation plan liabilities

Trading securities include securities held for trading purposes as well as assets held related to employee deferred compensation plans. Trading securities and associated deferred compensation plan liabilities are recorded at fair value on a recurring basis and included in “other short-term investments” and “accrued expenses and other liabilities,” respectively, on the consolidated

6

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

balance sheets. Level 1 trading securities include assets related to employee deferred compensation plans, which are invested in mutual funds, U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and other securities traded on an active exchange, such as the New York Stock Exchange. Deferred compensation plan liabilities represent the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets. Level 2 trading securities include municipal bonds and residential mortgage-backed securities issued by U.S. government-sponsored entities and corporate debt securities. The methods used to value trading securities are the same as the methods used to value investment securities available-for-sale, discussed below.

Loans held-for-sale

Loans held-for-sale, included in “other short-term investments” on the consolidated balance sheets, are recorded at the lower of cost or fair value. Loans held-for-sale may be carried at fair value on a nonrecurring basis when fair value is less than cost. The fair value is based on what secondary markets are currently offering for portfolios with similar characteristics. As such, the Corporation classifies both loans held-for-sale subjected to nonrecurring fair value adjustments and the estimated fair value of loans held-for sale as Level 2.

Investment securities available-for-sale

Investment securities available-for-sale are recorded at fair value on a recurring basis. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and money market funds. Level 2 securities include residential mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored entities and corporate debt securities. The fair value of Level 2 securities was determined using quoted prices of securities with similar characteristics, or pricing models based on observable market data inputs, primarily interest rates, spreads and prepayment information.

Securities classified as Level 3 represent securities in less liquid markets requiring significant management assumptions when determining fair value. Auction-rate securities comprise Level 3 investment securities available-for-sale. Due to the lack of a robust secondary auction-rate securities market with active fair value indicators, fair value for all periods presented was determined using an income approach based on a discounted cash flow model. The discounted cash flow model utilizes two significant inputs: discount rate and workout period. The discount rate was calculated using credit spreads of the underlying collateral or similar securities plus a liquidity risk premium. The liquidity risk premium was derived from the rate at which various types of similar auction-rate securities had been redeemed or sold. The workout period was based on an assessment of publicly available information on efforts to re-establish functioning markets for these securities and the Corporation's own redemption experience. Significant increases in any of these inputs in isolation would result in a significantly lower fair value. The Corporate Development Department, with appropriate oversight and approval provided by senior management, is responsible for determining the valuation methodology for auction-rate securities and for updating significant inputs based on changes to the factors discussed above. Valuation results, including an analysis of changes to the valuation methodology and significant inputs, are provided to senior management for review on a quarterly basis.

Loans

The Corporation does not record loans at fair value on a recurring basis. However, the Corporation may establish a specific allowance for an impaired loan based on the fair value of the underlying collateral. Such loan values are reported as nonrecurring fair value measurements. Collateral values supporting individually evaluated impaired loans are evaluated quarterly. When management determines that the fair value of the collateral requires additional adjustments, either as a result of non-current appraisal value or when there is no observable market price, the Corporation classifies the impaired loan as Level 3. The Special Assets Group is responsible for performing quarterly credit quality reviews for all impaired loans as part of the quarterly allowance for loan losses process overseen by the Chief Credit Officer, during which valuation adjustments to updated collateral values are determined.

The Corporation discloses fair value estimates for loans. The estimated fair value is determined based on characteristics such as loan category, repricing features and remaining maturity, and includes prepayment and credit loss estimates. For variable rate business loans that reprice frequently, the estimated fair value is based on carrying values adjusted for estimated credit losses inherent in the portfolio at the balance sheet date. For other business loans and retail loans, fair values are estimated using a discounted cash flow model that employs a discount rate that reflects the Corporation's current pricing for loans with similar characteristics and remaining maturity, adjusted by an amount for estimated credit losses inherent in the portfolio at the balance sheet date. The rates take into account the expected yield curve, as well as an adjustment for prepayment risk, when applicable. The Corporation classifies the estimated fair value of loans held for investment as Level 3.

7

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Customers’ liability on acceptances outstanding and acceptances outstanding

Customers' liability on acceptances outstanding is included in "accrued income and other assets" and acceptances outstanding are included in "accrued expenses and other liabilities" on the consolidated balance sheets. Due to their short-term nature, the carrying amount of these instruments approximates the estimated fair value. As such, the Corporation classifies the estimated fair value of these instruments as Level 1.

Derivative assets and derivative liabilities

Derivative instruments held or issued for risk management or customer-initiated activities are traded in over-the-counter markets where quoted market prices are not readily available. Fair value for over-the-counter derivative instruments is measured on a recurring basis using internally developed models that use primarily market observable inputs, such as yield curves and option volatilities. The Corporation manages credit risk on its derivative positions based on whether the derivatives are being settled through a clearinghouse or bilaterally with each counterparty. For derivative positions settled on a counterparty-by-counterparty basis, the Corporation calculates credit valuation adjustments, included in the fair value of these instruments, on the basis of its relationships at the counterparty portfolio/master netting agreement level. These credit valuation adjustments are determined by applying a credit spread for the counterparty or the Corporation, as appropriate, to the total expected exposure of the derivative after considering collateral and other master netting arrangements. These adjustments, which are considered Level 3 inputs, are based on estimates of current credit spreads to evaluate the likelihood of default. The Corporation assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Corporation classifies its over-the-counter derivative valuations in Level 2 of the fair value hierarchy. Examples of Level 2 derivative instruments are interest rate swaps and energy derivative and foreign exchange contracts.

Warrants which contain a net exercise provision or a non-contingent put right embedded in the warrant agreement are accounted for as derivatives and recorded at fair value on a recurring basis using a Black-Scholes valuation model. The Black-Scholes valuation model utilizes five inputs: risk-free rate, expected life, volatility, exercise price, and the per share market value of the underlying company. The Corporation holds a portfolio of warrants for generally nonmarketable equity securities with a fair value of $4 million at September 30, 2014, included in "accrued income and other assets" on the consolidated balance sheets. These warrants are primarily from non-public technology companies obtained as part of the loan origination process. The Corporate Development Department is responsible for the warrant valuation process, which includes reviewing all significant inputs for reasonableness, and for providing valuation results to senior management. Increases in any of these inputs in isolation, with the exception of exercise price, would result in a higher fair value. Increases in exercise price in isolation would result in a lower fair value. The Corporation classifies warrants accounted for as derivatives as Level 3.

The Corporation also holds a derivative contract associated with the 2008 sale of its remaining ownership of Visa Inc. (Visa) Class B shares. Under the terms of the derivative contract, the Corporation will compensate the counterparty primarily for dilutive adjustments made to the conversion factor of the Visa Class B to Class A shares based on the ultimate outcome of litigation involving Visa. Conversely, the Corporation will be compensated by the counterparty for any increase in the conversion factor from anti-dilutive adjustments. At September 30, 2014, the fair value of the contract was a liability of $3 million. The recurring fair value of the derivative contract is based on unobservable inputs consisting of management's estimate of the litigation outcome, timing of litigation settlements and payments related to the derivative. Significant increases in the estimate of litigation outcome and the timing of litigation settlements in isolation would result in a significantly higher liability fair value. Significant increases in payments related to the derivative in isolation would result in a significantly lower liability fair value. The Corporation classifies the derivative liability as Level 3.

Nonmarketable equity securities

The Corporation has a portfolio of indirect (through funds) private equity and venture capital investments with a carrying value and unfunded commitments of $12 million and $5 million, respectively, at September 30, 2014. These funds generally cannot be redeemed and the majority are not readily marketable. Distributions from these funds are received by the Corporation as a result of the liquidation of underlying investments of the funds and/or as income distributions. It is estimated that the underlying assets of the funds will be liquidated over a period of up to 15 years. Recently issued federal regulations may require the Corporation to sell certain of these funds prior to liquidation. The investments are accounted for either on the cost or equity method and are individually reviewed for impairment on a quarterly basis by comparing the carrying value to the estimated fair value. These investments may be carried at fair value on a nonrecurring basis when they are deemed to be impaired and written down to fair value. Where there is not a readily determinable fair value, the Corporation estimates fair value for indirect private equity and venture capital investments based on the net asset value, as reported by the fund, after indication that the fund adheres to applicable fair value measurement guidance. For those funds where the net asset value is not reported by the fund, the Corporation derives the fair value of the fund by estimating the fair value of each underlying investment in the fund. In addition to using qualitative

8

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

information about each underlying investment, as provided by the fund, the Corporation gives consideration to information pertinent to the specific nature of the debt or equity investment, such as relevant market conditions, offering prices, operating results, financial conditions, exit strategy and other qualitative information, as available. The lack of an independent source to validate fair value estimates, including the impact of future capital calls and transfer restrictions, is an inherent limitation in the valuation process. On a quarterly basis, the Corporate Development Department is responsible, with appropriate oversight and approval provided by senior management, for performing the valuation procedures and updating significant inputs, as are primarily provided by the underlying fund's management. The Corporation classifies fair value measurements of nonmarketable equity securities as Level 3. Commitments to fund additional investments in nonmarketable equity securities recorded at fair value on a nonrecurring basis were not significant at September 30, 2014 or December 31, 2013.

The Corporation also holds restricted equity investments, primarily Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock. Restricted equity securities are not readily marketable and are recorded at cost (par value) in "accrued income and other assets" on the consolidated balance sheets and evaluated for impairment based on the ultimate recoverability of the par value. No significant observable market data for these instruments is available. The Corporation considers the profitability and asset quality of the issuer, dividend payment history and recent redemption experience when determining the ultimate recoverability of the par value. The Corporation’s investment in FHLB stock totaled $7 million and $48 million at September 30, 2014 and December 31, 2013, respectively, and its investment in FRB stock totaled $85 million at both September 30, 2014 and December 31, 2013. The Corporation believes its investments in FHLB and FRB stock are ultimately recoverable at par. Therefore, the carrying amount for these restricted equity investments approximates fair value. The Corporation classifies the estimated fair value of such investments as Level 1.

Other real estate

Other real estate is included in “accrued income and other assets” on the consolidated balance sheets and includes primarily foreclosed property. Foreclosed property is initially recorded at fair value, less costs to sell, at the date of foreclosure, establishing a new cost basis. Subsequently, foreclosed property is carried at the lower of cost or fair value, less costs to sell. Other real estate may be carried at fair value on a nonrecurring basis when fair value is less than cost. Fair value is based upon independent market prices, appraised value or management's estimate of the value of the property. The Special Assets Group obtains updated independent market prices and appraised values, as required by state regulation or deemed necessary based on market conditions, and determines if additional write-downs are necessary. On a quarterly basis, senior management reviews all other real estate and determines whether the carrying values are reasonable, based on the length of time elapsed since receipt of independent market price or appraised value and current market conditions. When management determines that the fair value of other real estate requires additional adjustments, either as a result of a non-current appraisal or when there is no observable market price, the Corporation classifies the other real estate as Level 3.

Deposit liabilities

The estimated fair value of checking, savings and certain money market deposit accounts is represented by the amounts payable on demand. The estimated fair value of term deposits is calculated by discounting the scheduled cash flows using the period-end rates offered on these instruments. As such, the Corporation classifies the estimated fair value of deposit liabilities as Level 2.

Short-term borrowings

The carrying amount of federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings approximates the estimated fair value. As such, the Corporation classifies the estimated fair value of short-term borrowings as Level 1.

Medium- and long-term debt

The carrying value of variable-rate FHLB advances approximates the estimated fair value. The estimated fair value of the Corporation's remaining variable- and fixed-rate medium- and long-term debt is based on quoted market values when available. If quoted market values are not available, the estimated fair value is based on the market values of debt with similar characteristics. The Corporation classifies the estimated fair value of medium- and long-term debt as Level 2.

Credit-related financial instruments

Credit-related financial instruments include unused commitments to extend credit and letters of credit. These instruments generate ongoing fees which are recognized over the term of the commitment. In situations where credit losses are probable, the Corporation records an allowance. The carrying value of these instruments included in "accrued expenses and other liabilities" on the consolidated balance sheets, which includes the carrying value of the deferred fees plus the related allowance, approximates the estimated fair value. The Corporation classifies the estimated fair value of credit-related financial instruments as Level 3.

9

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

ASSETS AND LIABLILITIES RECORDED AT FAIR VALUE ON A RECURRING BASIS

The following tables present the recorded amount of assets and liabilities measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013.

(in millions)	Total		Level 1		Level 2		Level 3
September 30, 2014
Trading securities:
Deferred compensation plan assets	$	97	$	97	$	—	$	—
Equity and other non-debt securities	2		2		—		—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	4		—		4		—
Corporate debt securities	1		—		1		—
Total trading securities	107		99		8		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	9,109		—		9,109		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	53		—		52		1		(b)
Equity and other non-debt securities	238		125		—		113		(b)
Total investment securities available-for-sale	9,468		170		9,161		137
Derivative assets:
Interest rate contracts	306		—		306		—
Energy derivative contracts	86		—		86		—
Foreign exchange contracts	28		—		28		—
Warrants	4		—		—		4
Total derivative assets	424		—		420		4
Total assets at fair value	$	9,999	$	269	$	9,589	$	141
Derivative liabilities:
Interest rate contracts	$	97	$	—	$	97	$	—
Energy derivative contracts	85		—		85		—
Foreign exchange contracts	28		—		28		—
Other	3		—		—		3
Total derivative liabilities	213		—		210		3
Deferred compensation plan liabilities	97		97		—		—
Total liabilities at fair value	$	310	$	97	$	210	$	3

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

10

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

(in millions)	Total		Level 1		Level 2		Level 3
December 31, 2013
Trading securities:
Deferred compensation plan assets	$	96	$	96	$	—	$	—
Equity and other non-debt securities	7		7		—		—
Residential mortgage-backed securities (a)	2		—		2		—
State and municipal securities	3		—		3		—
Total trading securities	108		103		5		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	8,926		—		8,926		—
State and municipal securities	22		—		—		22		(b)
Corporate debt securities	56		—		55		1		(b)
Equity and other non-debt securities	258		122		—		136		(b)
Total investment securities available-for-sale	9,307		167		8,981		159
Derivative assets:
Interest rate contracts	380		—		380		—
Energy derivative contracts	105		—		105		—
Foreign exchange contracts	15		—		15		—
Warrants	3		—		—		3
Total derivative assets	503		—		500		3
Total assets at fair value	$	9,918	$	270	$	9,486	$	162
Derivative liabilities:
Interest rate contracts	$	133	$	—	$	133	$	—
Energy derivative contracts	102		—		102		—
Foreign exchange contracts	14		—		14		—
Other	2		—		—		2
Total derivative liabilities	251		—		249		2
Deferred compensation plan liabilities	96		96		—		—
Total liabilities at fair value	$	347	$	96	$	249	$	2

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

There were no transfers of assets or liabilities recorded at fair value on a recurring basis into or out of Level 1, Level 2 and Level 3 fair value measurements during each of the three- and nine-month periods ended September 30, 2014 and 2013.

11

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three- and nine-month periods ended September 30, 2014 and 2013.

			Net Realized/Unrealized Gains (Losses) (Pretax)
	Balance  at Beginning of Period		Recorded in Earnings							Recorded in Other Comprehensive Income										Balance  at End of  Period
(in millions)			Realized			Unrealized								Sales			Settlements
Three Months Ended September 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	118		1		(c)	—				1			(b)	(7		)	—			113
Total investment securities available-for-sale	142		1		(c)	—				1			(b)	(7		)	—			137
Derivative assets:
Warrants	4		2		(d)	—				—				(2		)	—			4
Derivative liabilities:
Other	2		—			(1		)	(c)	—				—			—			3
Three Months Ended September 30, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	25	$	—		$	—			$	—			$	—		$	—		$	25
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	146		1		(c)	—				5			(b)	(11		)	—			141
Total investment securities available-for-sale	172		1		(c)	—				5			(b)	(11		)	—			167
Derivative assets:
Warrants	3		7		(d)	—				—				(2		)	(6		)	2
Derivative liabilities:
Other	3		—			—				—				—			(1		)	2
Nine Months Ended September 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	22	$	—		$	—			$	1		(b)	$	—		$	—		$	23
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	136		2		(c)	—				7			(b)	(32		)	—			113
Total investment securities available-for-sale	159		2		(c)	—				8			(b)	(32		)	—			137
Derivative assets:
Warrants	3		6		(d)	1			(d)	—				(6		)	—			4
Derivative liabilities:
Other	2		—			(1		)	(c)	—				—			—			3
Nine Months Ended September 30, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—			$	2		(b)	$	—		$	—		$	25
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	156		1		(c)	—				(1		)	(b)	(15		)	—			141
Total investment securities available-for-sale	180		1		(c)	—				1			(b)	(15		)	—			167
Derivative assets:
Warrants	3		8		(d)	1			(d)	—				(4		)	(6		)	2
Derivative liabilities:
Other	1		—			(2		)	(c)	—				—			(1		)	2

(a) Auction-rate securities.

(b) Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income.

(c) Realized and unrealized gains and losses due to changes in fair value recorded in "net securities gains" on the consolidated statements of comprehensive income.

(d) Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income.

12

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

ASSETS AND LIABILITIES RECORDED AT FAIR VALUE ON A NONRECURRING BASIS

The Corporation may be required, from time to time, to record certain assets and liabilities at fair value on a nonrecurring basis. These include assets that are recorded at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. All assets recorded at fair value on a nonrecurring basis were classified as Level 3 at September 30, 2014 and December 31, 2013 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013.

(in millions)	Level 3
September 30, 2014
Loans:
Commercial	$	14
Real estate construction	14
Commercial mortgage	68
Total loans	96
Nonmarketable equity securities	1
Other real estate	1
Total assets at fair value	$	98
December 31, 2013
Loans:
Commercial	$	43
Real estate construction	20
Commercial mortgage	61
International	4
Total loans	128
Nonmarketable equity securities	2
Other real estate	5
Total assets at fair value	$	135

Level 3 assets recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013 included loans for which a specific allowance was established based on the fair value of collateral and other real estate for which fair value of the properties was less than the cost basis. For both asset classes, the unobservable inputs were the additional adjustments applied by management to the appraised values to reflect such factors as non-current appraisals and revisions to estimated time to sell. These adjustments are determined based on qualitative judgments made by management on a case-by-case basis and are not quantifiable inputs, although they are used in the determination of fair value.

The following table presents quantitative information related to the significant unobservable inputs utilized in the Corporation's Level 3 recurring fair value measurement as of September 30, 2014 and December 31, 2013. The Corporation's Level 3 recurring fair value measurements include auction-rate securities where fair value is determined using an income approach based on a discounted cash flow model. The inputs in the table below reflect management's expectation of continued illiquidity in the secondary auction-rate securities market due to a lack of market activity for the issuers remaining in the portfolio, a lack of market incentives for issuer redemptions, and the expectation for a continuing low interest rate environment. The September 30, 2014 workout periods reflect management's view that short-term interest rates could begin to rise in 2015.

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
September 30, 2014
State and municipal securities (a)	$	23	3% - 10%	1 - 3
Equity and other non-debt securities (a)	113		4% - 8%	1 - 2
December 31, 2013
State and municipal securities (a)	$	22	5% - 10%	3 - 4
Equity and other non-debt securities (a)	136		5% - 8%	2 - 3

(a) Auction-rate securities.

13

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

ESTIMATED FAIR VALUES OF FINANCIAL INSTRUMENTS NOT RECORDED AT FAIR VALUE ON A RECURRING BASIS

The Corporation typically holds the majority of its financial instruments until maturity and thus does not expect to realize many of the estimated fair value amounts disclosed. The disclosures also do not include estimated fair value amounts for items that are not defined as financial instruments, but which have significant value. These include such items as core deposit intangibles, the future earnings potential of significant customer relationships and the value of trust operations and other fee generating businesses. The Corporation believes the imprecision of an estimate could be significant.

The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis on the Corporation’s consolidated balance sheets are as follows:

	Carrying Amount			Estimated Fair Value
(in millions)				Total			Level 1		Level 2		Level 3
September 30, 2014
Assets
Cash and due from banks	$	1,039		$	1,039		$	1,039	$	—	$	—
Interest-bearing deposits with banks	6,748			6,748			6,748		—		—
Loans held-for-sale	5			5			—		5		—
Total loans, net of allowance for loan losses (a)	47,116			46,980			—		—		46,980
Customers’ liability on acceptances outstanding	15			15			15		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	27,490			27,490			—		27,490		—
Interest-bearing deposits	25,393			25,393			—		25,393		—
Customer certificates of deposit	4,698			4,686			—		4,686		—
Total deposits	57,581			57,569			—		57,569		—
Short-term borrowings	202			202			202		—		—
Acceptances outstanding	15			15			15		—		—
Medium- and long-term debt	2,669			2,696			—		2,696		—
Credit-related financial instruments	(91		)	(91		)	—		—		(91		)
December 31, 2013
Assets
Cash and due from banks	$	1,140		$	1,140		$	1,140	$	—	$	—
Interest-bearing deposits with banks	5,311			5,311			5,311		—		—
Loans held-for-sale	4			4			—		4		—
Total loans, net of allowance for loan losses (a)	44,872			44,801			—		—		44,801
Customers’ liability on acceptances outstanding	11			11			11		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	133			133			133		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,875			23,875			—		23,875		—
Interest-bearing deposits	24,354			24,354			—		24,354		—
Customer certificates of deposit	5,063			5,055			—		5,055		—
Total deposits	53,292			53,284			—		53,284		—
Short-term borrowings	253			253			253		—		—
Acceptances outstanding	11			11			11		—		—
Medium- and long-term debt	3,543			3,540			—		3,540		—
Credit-related financial instruments	(88		)	(88		)	—		—		(88		)

(a) Included $96 million and $128 million of impaired loans recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

(b) Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

14

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

NOTE 3 - INVESTMENT SECURITIES

A summary of the Corporation’s investment securities available-for-sale follows:

(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
September 30, 2014
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,131		106		128		9,109
State and municipal securities	24		—		1		23
Corporate debt securities	53		—		—		53
Equity and other non-debt securities	238		1		1		238
Total investment securities available-for-sale (b)	$	9,491	$	107	$	130	$	9,468
December 31, 2013
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,023		91		188		8,926
State and municipal securities	24		—		2		22
Corporate debt securities	56		—		—		56
Equity and other non-debt securities	266		1		9		258
Total investment securities available-for-sale (b)	$	9,414	$	92	$	199	$	9,307

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Included auction-rate securities at amortized cost and fair value of $138 million and $137 million, respectively, as of September 30, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

A summary of the Corporation’s investment securities available-for-sale in an unrealized loss position as of September 30, 2014 and December 31, 2013 follows:

	Temporarily Impaired
	Less than 12 Months				12 Months or more					Total
(in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
September 30, 2014
Residential mortgage-backed securities (a)	$	1,434	$	11	$	3,519	$	117		$	4,953	$	128
State and municipal securities (b)	—		—		23		1			23		1
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		113		1			113		1
Total impaired securities	$	1,434	$	11	$	3,656	$	119		$	5,090	$	130
December 31, 2013
Residential mortgage-backed securities (a)	$	5,825	$	187	$	11	$	1		$	5,836	$	188
State and municipal securities (b)	—		—		22		2			22		2
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		148		9			148		9
Total impaired securities	$	5,825	$	187	$	182	$	12		$	6,007	$	199

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

(c) Unrealized losses less than $0.5 million.

At September 30, 2014, the Corporation had 162 securities in an unrealized loss position with no credit impairment, including 101 residential mortgage-backed securities, 43 equity and other non-debt auction-rate preferred securities, 17 state and municipal auction-rate securities, and one corporate auction-rate debt security. As of September 30, 2014, approximately 89 percent of the aggregate par value of auction-rate securities have been redeemed or sold since acquisition, of which approximately 95 percent were redeemed at or above cost. The unrealized losses for these securities resulted from changes in market interest rates and liquidity. The Corporation ultimately expects full collection of the carrying amount of these securities, does not intend to sell the securities in an unrealized loss position, and it is not more-likely-than-not that the Corporation will be required to sell the securities in an unrealized loss position prior to recovery of amortized cost. The Corporation does not consider these securities to be other-than-temporarily impaired at September 30, 2014.

15

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Sales, calls and write-downs of investment securities available-for-sale resulted in the following gains and losses recorded in “net securities (losses) gains” on the consolidated statements of comprehensive income, computed based on the adjusted cost of the specific security.

	Nine Months Ended September 30,
(in millions)	2014			2013
Securities gains	$	1		$	1
Securities losses (a)	(1		)	(2		)
Net securities (losses) gains	$	—		$	(1	)

(a) Primarily charges related to a derivative contract tied to the conversion rate of Visa Class B shares.

The following table summarizes the amortized cost and fair values of debt securities by contractual maturity. Securities with multiple maturity dates are classified in the period of final maturity. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(in millions)
September 30, 2014	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	131	$	132
After one year through five years	443		442
After five years through ten years	571		600
After ten years	8,108		8,056
Subtotal	9,253		9,230
Equity and other non-debt securities	238		238
Total investment securities available-for-sale	$	9,491	$	9,468

Included in the contractual maturity distribution in the table above were auction-rate securities with a total amortized cost and fair value of $24 million and $23 million, respectively. Auction-rate securities are long-term, floating rate instruments for which interest rates are reset at periodic auctions. At each successful auction, the Corporation has the option to sell the security at par value. Additionally, the issuers of auction-rate securities generally have the right to redeem or refinance the debt. As a result, the expected life of auction-rate securities may differ significantly from the contractual life. Also included in the table above were residential mortgage-backed securities with total amortized cost and fair value of $9.1 billion. The actual cash flows of mortgage-backed securities may differ from contractual maturity as the borrowers of the underlying loans may exercise prepayment options.

At September 30, 2014, investment securities with a carrying value of $3.1 billion were pledged where permitted or required by law to secure $2.1 billion of liabilities, primarily public and other deposits of state and local government agencies and derivative instruments.

16

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

NOTE 4 – CREDIT QUALITY AND ALLOWANCE FOR CREDIT LOSSES

The following table presents an aging analysis of the recorded balance of loans.

	Loans Past Due and Still Accruing
(in millions)	30-59 Days		60-89  Days		90 Days or More		Total		Nonaccrual Loans		Current Loans (c)		Total  Loans
September 30, 2014
Business loans:
Commercial	$	7	$	57	$	5	$	69	$	93	$	30,597	$	30,759
Real estate construction:
Commercial Real Estate business line (a)	—		2		—		2		17		1,664		1,683
Other business lines (b)	—		—		—		—		1		308		309
Total real estate construction	—		2		—		2		18		1,972		1,992
Commercial mortgage:
Commercial Real Estate business line (a)	4		1		—		5		49		1,689		1,743
Other business lines (b)	29		2		7		38		95		6,727		6,860
Total commercial mortgage	33		3		7		43		144		8,416		8,603
Lease financing	—		—		—		—		—		805		805
International	2		2		—		4		—		1,425		1,429
Total business loans	42		64		12		118		255		43,215		43,588
Retail loans:
Residential mortgage	9		5		—		14		42		1,741		1,797
Consumer:
Home equity	5		2		1		8		31		1,595		1,634
Other consumer	1		—		—		1		1		687		689
Total consumer	6		2		1		9		32		2,282		2,323
Total retail loans	15		7		1		23		74		4,023		4,120
Total loans	$	57	$	71	$	13	$	141	$	329	$	47,238	$	47,708
December 31, 2013
Business loans:
Commercial	$	36	$	17	$	4	$	57	$	81	$	28,677	$	28,815
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		20		1,427		1,447
Other business lines (b)	—		—		—		—		1		314		315
Total real estate construction	—		—		—		—		21		1,741		1,762
Commercial mortgage:
Commercial Real Estate business line (a)	9		1		—		10		51		1,617		1,678
Other business lines (b)	27		6		4		37		105		6,967		7,109
Total commercial mortgage	36		7		4		47		156		8,584		8,787
Lease financing	—		—		—		—		—		845		845
International	—		—		3		3		4		1,320		1,327
Total business loans	72		24		11		107		262		41,167		41,536
Retail loans:
Residential mortgage	15		3		—		18		53		1,626		1,697
Consumer:
Home equity	6		2		—		8		33		1,476		1,517
Other consumer	4		1		5		10		2		708		720
Total consumer	10		3		5		18		35		2,184		2,237
Total retail loans	25		6		5		36		88		3,810		3,934
Total loans	$	97	$	30	$	16	$	143	$	350	$	44,977	$	45,470

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Included purchased credit-impaired (PCI) loans with a total carrying value of $3 million at September 30, 2014 and $5 million at December 31, 2013.

17

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table presents loans by credit quality indicator, based on internal risk ratings assigned to each business loan at the time of approval and subjected to subsequent reviews, generally at least annually, and to pools of retail loans with similar risk characteristics.

	Internally Assigned Rating
(in millions)	Pass (a)		Special Mention (b)		Substandard (c)		Nonaccrual (d)		Total
September 30, 2014
Business loans:
Commercial	$	29,439	$	545	$	682	$	93	$	30,759
Real estate construction:
Commercial Real Estate business line (e)	1,654		12		—		17		1,683
Other business lines (f)	301		7		—		1		309
Total real estate construction	1,955		19		—		18		1,992
Commercial mortgage:
Commercial Real Estate business line (e)	1,590		75		29		49		1,743
Other business lines (f)	6,436		149		180		95		6,860
Total commercial mortgage	8,026		224		209		144		8,603
Lease financing	765		37		3		—		805
International	1,407		10		12		—		1,429
Total business loans	41,592		835		906		255		43,588
Retail loans:
Residential mortgage	1,746		4		5		42		1,797
Consumer:
Home equity	1,593		2		8		31		1,634
Other consumer	683		3		2		1		689
Total consumer	2,276		5		10		32		2,323
Total retail loans	4,022		9		15		74		4,120
Total loans	$	45,614	$	844	$	921	$	329	$	47,708
December 31, 2013
Business loans:
Commercial	$	27,470	$	590	$	674	$	81	$	28,815
Real estate construction:
Commercial Real Estate business line (e)	1,399		13		15		20		1,447
Other business lines (f)	314		—		—		1		315
Total real estate construction	1,713		13		15		21		1,762
Commercial mortgage:
Commercial Real Estate business line (e)	1,474		92		61		51		1,678
Other business lines (f)	6,596		145		263		105		7,109
Total commercial mortgage	8,070		237		324		156		8,787
Lease financing	841		3		1		—		845
International	1,298		7		18		4		1,327
Total business loans	39,392		850		1,032		262		41,536
Retail loans:
Residential mortgage	1,635		3		6		53		1,697
Consumer:
Home equity	1,475		4		5		33		1,517
Other consumer	708		3		7		2		720
Total consumer	2,183		7		12		35		2,237
Total retail loans	3,818		10		18		88		3,934
Total loans	$	43,210	$	860	$	1,050	$	350	$	45,470

(a) Includes all loans not included in the categories of special mention, substandard or nonaccrual.

(b) Special mention loans are accruing loans that have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date.

(c) Substandard loans are accruing loans that have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans also are distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. PCI loans are included in the substandard category. This category is generally consistent with the "substandard" category as defined by regulatory authorities.

(d) Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-58 in the Corporation's 2013 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.

(e) Primarily loans to real estate developers.

(f) Primarily loans secured by owner-occupied real estate.

18

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table summarizes nonperforming assets.

(in millions)	September 30, 2014		December 31, 2013
Nonaccrual loans	$	329	$	350
Reduced-rate loans (a)	17		24
Total nonperforming loans	346		374
Foreclosed property	11		9
Total nonperforming assets	$	357	$	383

(a) Reduced-rate business loans were zero at September 30, 2014 and $4 million at December 31, 2013, and reduced-rate retail loans were $17 million and $20 million at September 30, 2014 and December 31, 2013, respectively.

Allowance for Credit Losses

The following table details the changes in the allowance for loan losses and related loan amounts.

	2014									2013
(in millions)	Business Loans			Retail Loans			Total			Business Loans			Retail Loans			Total
Three Months Ended September 30
Allowance for loan losses:
Balance at beginning of period	$	528		$	63		$	591		$	542		$	71		$	613
Loan charge-offs	(20		)	(4		)	(24		)	(30		)	(9		)	(39		)
Recoveries on loans previously charged-off	19			2			21			18			2			20
Net loan charge-offs	(1		)	(2		)	(3		)	(12		)	(7		)	(19		)
Provision for loan losses	2			2			4			5			5			10
Balance at end of period	$	529		$	63		$	592		$	535		$	69		$	604
Nine Months Ended September 30
Allowance for loan losses:
Balance at beginning of period	$	531		$	67		$	598		$	552		$	77		$	629
Loan charge-offs	(71		)	(11		)	(82		)	(94		)	(18		)	(112		)
Recoveries on loans previously charged-off	50			8			58			45			7			52
Net loan charge-offs	(21		)	(3		)	(24		)	(49		)	(11		)	(60		)
Provision for loan losses	19			(1		)	18			32			3			35
Balance at end of period	$	529		$	63		$	592		$	535		$	69		$	604
As a percentage of total loans	1.21		%	1.52		%	1.24		%	1.32		%	1.83		%	1.37		%
September 30
Allowance for loan losses:
Individually evaluated for impairment	$	40		$	—		$	40		$	67		$	—		$	67
Collectively evaluated for impairment	489			63			552			468			69			537
Total allowance for loan losses	$	529		$	63		$	592		$	535		$	69		$	604
Loans:
Individually evaluated for impairment	$	204		$	44		$	248		$	294		$	52		$	346
Collectively evaluated for impairment	43,384			4,073			47,457			40,045			3,745			43,790
PCI loans (a)	—			3			3			10			5			15
Total loans evaluated for impairment	$	43,588		$	4,120		$	47,708		$	40,349		$	3,802		$	44,151

(a)    No allowance for loan losses was required for PCI loans at September 30, 2014 and 2013.

Changes in the allowance for credit losses on lending-related commitments, included in "accrued expenses and other liabilities" on the consolidated balance sheets, are summarized in the following table.

	Three Months Ended September 30,					Nine Months Ended September 30,
(in millions)	2014		2013			2014		2013
Balance at beginning of period	$	42	$	36		$	36	$	32
Provision for credit losses on lending-related commitments	1		(2		)	7		2
Balance at end of period	$	43	$	34		$	43	$	34

19

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Individually Evaluated Impaired Loans

The following table presents additional information regarding individually evaluated impaired loans.

	Recorded Investment In:
(in millions)	Impaired Loans with No Related Allowance		Impaired Loans with Related Allowance		Total Impaired Loans		Unpaid Principal Balance		Related Allowance for Loan Losses
September 30, 2014
Business loans:
Commercial	$	4	$	82	$	86	$	124	$	19
Real estate construction:
Commercial Real Estate business line (a)	—		14		14		16		1
Other business lines (b)	—		1		1		1		—
Total real estate construction	—		15		15		17		1
Commercial mortgage:
Commercial Real Estate business line (a)	—		35		35		68		14
Other business lines (b)	2		65		67		91		6
Total commercial mortgage	2		100		102		159		20
International	1		—		1		1		—
Total business loans	7		197		204		301		40
Retail loans:
Residential mortgage	28		—		28		17		—
Consumer:
Home equity	12		—		12		16		—
Other consumer	4		—		4		5		—
Total consumer	16		—		16		21		—
Total retail loans (c)	44		—		44		38		—
Total individually evaluated impaired loans	$	51	$	197	$	248	$	339	$	40
December 31, 2013
Business loans:
Commercial	$	10	$	64	$	74	$	121	$	26
Real estate construction:
Commercial Real Estate business line (a)	—		20		20		24		3
Other business lines (b)	—		1		1		1		—
Total real estate construction	—		21		21		25		3
Commercial mortgage:
Commercial Real Estate business line (a)	—		60		60		104		12
Other business lines (b)	1		63		64		90		15
Total commercial mortgage	1		123		124		194		27
International	—		4		4		4		1
Total business loans	11		212		223		344		57
Retail loans:
Residential mortgage	35		—		35		42		—
Consumer:
Home equity	12		—		12		17		—
Other consumer	4		—		4		12		—
Total consumer	16		—		16		29		—
Total retail loans (c)	51		—		51		71		—
Total individually evaluated impaired loans	$	62	$	212	$	274	$	415	$	57

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy changes which resulted in direct write-downs of restructured retail loans. 

20

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table presents information regarding average individually evaluated impaired loans and the related interest recognized. Interest income recognized for the period primarily related to reduced-rate loans.

	Individually Evaluated Impaired Loans
	2014				2013
(in millions)	Average Balance for the Period		Interest Income Recognized for the Period		Average Balance for the Period		Interest Income Recognized for the Period
Three Months Ended September 30
Business loans:
Commercial	$	74	$	1	$	96	$	—
Real estate construction:
Commercial Real Estate business line (a)	16		—		24		—
Commercial mortgage:
Commercial Real Estate business line (a)	49		—		78		—
Other business lines (b)	70		—		106		1
Total commercial mortgage	119		—		184		1
International	1		—		—		—
Total business loans	210		1		304		1
Retail loans:
Residential mortgage	29		—		35		—
Consumer loans:
Home equity	11		—		8		—
Other consumer	4		—		4		—
Total consumer	15		—		12		—
Total retail loans	44		—		47		—
Total individually evaluated impaired loans	$	254	$	1	$	351	$	1
Nine Months Ended September 30
Business loans:
Commercial	$	68	$	1	$	105	$	2
Real estate construction:
Commercial Real Estate business line (a)	17		—		25		—
Other business lines (b)	1		—		—		—
Total real estate construction	18		—		25		—
Commercial mortgage:
Commercial Real Estate business line (a)	56		—		87		—
Other business lines (b)	68		2		114		2
Total commercial mortgage	124		2		201		2
Lease financing	—		—		1		—
International	2		—		—		—
Total business loans	212		3		332		4
Retail loans:
Residential mortgage	31		—		36		—
Consumer:
Home equity	12		—		7		—
Other consumer	4		—		4		—
Total consumer	16		—		11		—
Total retail loans	47		—		47		—
Total individually evaluated impaired loans	$	259	$	3	$	379	$	4

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

21

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Troubled Debt Restructurings

The following tables detail the recorded balance at September 30, 2014 and 2013 of loans considered to be TDRs that were restructured during the three- and nine-month periods ended September 30, 2014 and 2013, by type of modification. In cases of loans with more than one type of modification, the loans were categorized based on the most significant modification.

	2014							2013
	Type of Modification							Type of Modification
(in millions)	Principal Deferrals (a)			Interest Rate Reductions		Total Modifications		Principal Deferrals (a)			Interest Rate Reductions		AB Note Restructures (b)		Total Modifications
Three Months Ended September 30
Business loans:
Commercial	$	2		$	—	$	2	$	3		$	—	$	—	$	3
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		14			—		—		14
Other business lines (d)	6			—		6		4			—		—		4
Total commercial mortgage	6			—		6		18			—		—		18
Total business loans	8			—		8		21			—		—		21
Retail loans:
Residential mortgage	—			—		—		—			1		—		1
Consumer:
Home equity	1		(e)	—		1		4		(e)	1		—		5
Other consumer	—			—		—		2		(e)	—		—		2
Total consumer	1			—		1		6			1		—		7
Total retail loans	1			—		1		6			2		—		8
Total loans	$	9		$	—	$	9	$	27		$	2	$	—	$	29
Nine Months Ended September 30
Business loans:
Commercial	$	3		$	—	$	3	$	13		$	—	$	8	$	21
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		33			—		—		33
Other business lines (d)	10			—		10		15			—		11		26
Total commercial mortgage	10			—		10		48			—		11		59
International	1			—		1		—			—		—		—
Total business loans	14			—		14		61			—		19		80
Retail loans:
Residential mortgage	—			—		—		1		(e)	2		—		3
Consumer:
Home equity	1		(e)	2		3		6		(e)	1		—		7
Other consumer	—			—		—		2		(e)	1		—		3
Total consumer	1			2		3		8			2		—		10
Total retail loans	1			2		3		9			4		—		13
Total loans	$	15		$	2	$	17	$	70		$	4	$	19	$	93

(a) Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates.

(b) Loan restructurings whereby the original loan is restructured into two notes: an "A" note, which generally reflects the portion of the modified loan which is expected to be collected; and a "B" note, which is either fully charged off or exchanged for an equity interest.

(c) Primarily loans to real estate developers.

(d) Primarily loans secured by owner-occupied real estate.

(e) Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

At September 30, 2014 and December 31, 2013, commitments to lend additional funds to borrowers whose terms have been modified in TDRs totaled $1 million and $4 million, respectively.

The majority of the modifications considered to be TDRs that occurred during the nine months ended September 30, 2014 and 2013 were principal deferrals. The Corporation charges interest on principal balances outstanding during deferral periods. Additionally, none of the modifications involved forgiveness of principal. As a result, the current and future financial effects of the recorded balance of loans considered to be TDRs that were restructured during the nine months ended September 30, 2014 and 2013 were insignificant.

22

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

On an ongoing basis, the Corporation monitors the performance of modified loans to their restructured terms. In the event of a subsequent default, the allowance for loan losses continues to be reassessed on the basis of an individual evaluation of the loan.

The following table presents information regarding the recorded balance at September 30, 2014 and 2013 of loans modified by principal deferral during the twelve months ended September 30, 2014 and 2013, and those principal deferrals which experienced a subsequent default during the three- and nine-month periods ended September 30, 2014 and 2013. For principal deferrals, incremental deterioration in the credit quality of the loan, represented by a downgrade in the risk rating of the loan, for example, due to missed interest payments or a reduction of collateral value, is considered a subsequent default.

	2014							2013
(in millions)	Balance at September 30			Subsequent Default in the Three Months Ended September 30		Subsequent Default in the Nine Months Ended September 30		Balance at September 30			Subsequent Default in the Three Months Ended September 30		Subsequent Default in the Nine Months Ended September 30
Principal deferrals:
Business loans:
Commercial	$	13		$	6	$	9	$	13		$	2	$	11
Real estate construction:
Commercial Real Estate business line (a)	—			—		—		1			—		—
Commercial mortgage:
Commercial Real Estate business line (a)	4			—		—		34			—		20
Other business lines (b)	10			4		4		20			2		11
Total commercial mortgage	14			4		4		54			2		31
International	1			—		—		—			—		—
Total business loans	28			10		13		68			4		42
Retail loans:
Residential mortgage	2		(c)	—		—		3		(c)	—		—
Consumer:
Home equity	2		(c)	—		—		7		(c)	—		—
Other consumer	—			—		—		3		(c)	—		—
Total consumer	2			—		—		10			—		—
Total retail loans	4			—		—		13			—		—
Total principal deferrals	$	32		$	10	$	13	$	81		$	4	$	42

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

During the twelve months ended September 30, 2014 and 2013, loans with a carrying value of $3 million and $4 million, respectively, were modified by interest rate reduction. During the twelve months ended September 30, 2013, loans with a carrying value of $19 million were restructured into two notes (AB note restructures). For reduced-rate loans and AB note restructures, a subsequent payment default is defined in terms of delinquency, when a principal or interest payment is 90 days past due. There were no subsequent payment defaults of reduced-rate loans or AB note restructures during the three- and nine-month periods ended September 30, 2014 and 2013.

Purchased Credit-Impaired Loans

Acquired loans are initially recorded at fair value with no carryover of any allowance for loan losses. Loans acquired with evidence of credit quality deterioration at acquisition for which it was probable that the Corporation would not be able to collect all contractual amounts due were accounted for as PCI loans. The Corporation aggregated the acquired PCI loans into pools of loans based on common risk characteristics.

23

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

No allowance for loan losses was required on the acquired PCI loan pools at both September 30, 2014 and December 31, 2013. The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at September 30, 2014 and December 31, 2013 were as follows.

(in millions)	September 30, 2014		December 31, 2013
Acquired PCI loans:
Carrying amount	$	3	$	5
Outstanding balance (principal and unpaid interest)	17		46

Changes in the accretable yield for acquired PCI loans for the three- and nine-month periods ended September 30, 2014 and 2013 were as follows.

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Balance at beginning of period	$	6		$	10		$	15		$	16
Reclassifications from nonaccretable	1			4			10			4
Accretion	(1		)	(3		)	(19		)	(9		)
Balance at end of period	$	6		$	11		$	6		$	11

NOTE 5 - DERIVATIVE AND CREDIT-RELATED FINANCIAL INSTRUMENTS

In the normal course of business, the Corporation enters into various transactions involving derivative and credit-related financial instruments to manage exposure to fluctuations in interest rate, foreign currency and other market risks and to meet the financing needs of customers (customer-initiated derivatives). These financial instruments involve, to varying degrees, elements of market and credit risk. Market and credit risk are included in the determination of fair value.

Market risk is the potential loss that may result from movements in interest rates, foreign currency exchange rates or energy commodity prices that cause an unfavorable change in the value of a financial instrument. The Corporation manages this risk by establishing monetary exposure limits and monitoring compliance with those limits. Market risk inherent in interest rate and energy contracts entered into on behalf of customers is mitigated by taking offsetting positions, except in those circumstances when the amount, tenor and/or contract rate level results in negligible economic risk, whereby the cost of purchasing an offsetting contract is not economically justifiable. The Corporation mitigates most of the inherent market risk in foreign exchange contracts entered into on behalf of customers by taking offsetting positions and manages the remainder through individual foreign currency position limits and aggregate value-at-risk limits. These limits are established annually and reviewed quarterly. Market risk inherent in derivative instruments held or issued for risk management purposes is typically offset by changes in the fair value of the assets or liabilities being hedged.

Credit risk is the possible loss that may occur in the event of nonperformance by the counterparty to a financial instrument. The Corporation attempts to minimize credit risk arising from customer-initiated derivatives by evaluating the creditworthiness of each customer, adhering to the same credit approval process used for traditional lending activities and obtaining collateral as deemed necessary. Derivatives with dealer counterparties are either cleared through a clearinghouse or settled directly with a single counterparty. For derivatives settled directly with dealer counterparties, the Corporation utilizes counterparty risk limits and monitoring procedures as well as master netting arrangements and bilateral collateral agreements to facilitate the management of credit risk. Master netting arrangements effectively reduce credit risk by permitting settlement of positive and negative positions and offset cash collateral held with the same counterparty on a net basis. Bilateral collateral agreements require daily exchange of cash or highly rated securities issued by the U.S. Treasury or other U.S. government entities to collateralize amounts due to either party beyond certain risk limits. At September 30, 2014, counterparties with bilateral collateral agreements had pledged $124 million of marketable investment securities and deposited $12 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had pledged $1 million of investment securities and posted $2 million of cash as collateral for contracts in an unrealized loss position. For those counterparties not covered under bilateral collateral agreements, collateral is obtained, if deemed necessary, based on the results of management’s credit evaluation of the counterparty. Collateral varies, but may include cash, investment securities, accounts receivable, equipment or real estate. Included in the fair value of derivative instruments are credit valuation adjustments reflecting counterparty credit risk. These adjustments are determined by applying a credit spread for the counterparty or the Corporation, as appropriate, to the total expected exposure of the derivative.

The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position on September 30, 2014 was $5 million, for which the Corporation had pledged collateral of $1 million in the normal course of business. The credit-risk-related contingent features require the Corporation’s debt to maintain an investment grade credit rating from each of the major credit rating agencies. If the Corporation’s debt were to fall below investment grade, the

24

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

counterparties to the derivative instruments could require additional overnight collateral on derivative instruments in net liability positions. If the credit-risk-related contingent features underlying these agreements had been triggered on September 30, 2014, the Corporation would have been required to assign an additional $4 million of collateral to its counterparties.

Derivative Instruments

Derivative instruments utilized by the Corporation are negotiated over-the-counter and primarily include swaps, caps and floors, forward contracts and options, each of which may relate to interest rates, energy commodity prices or foreign currency exchange rates. Swaps are agreements in which two parties periodically exchange cash payments based on specified indices applied to a specified notional amount until a stated maturity. Caps and floors are agreements which entitle the buyer to receive cash payments based on the difference between a specified reference rate or price and an agreed strike rate or price, applied to a specified notional amount until a stated maturity. Forward contracts are over-the-counter agreements to buy or sell an asset at a specified future date and price. Options are similar to forward contracts except the purchaser has the right, but not the obligation, to buy or sell the asset during a specified period or at a specified future date.

Over-the-counter contracts are tailored to meet the needs of the counterparties involved and, therefore, contain a greater degree of credit risk and liquidity risk than exchange-traded contracts, which have standardized terms and readily available price information. The Corporation reduces exposure to market and liquidity risks from over-the-counter derivative instruments entered into for risk management purposes, and transactions entered into to mitigate the market risk associated with customer-initiated transactions, by conducting hedging transactions with investment grade domestic and foreign financial institutions and subjecting counterparties to credit approvals, limits and collateral monitoring procedures similar to those used in making other extensions of credit. In addition, certain derivative contracts executed bilaterally with a dealer counterparty in the over-the-counter market are cleared through a clearinghouse, whereby the clearinghouse becomes the counterparty to the transaction.

25

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table presents the composition of the Corporation’s derivative instruments held or issued for risk management purposes or in connection with customer-initiated and other activities at September 30, 2014 and December 31, 2013. The table excludes commitments, warrants accounted for as derivatives and a derivative related to the Corporation’s 2008 sale of its remaining ownership of Visa shares.

	September 30, 2014								December 31, 2013
			Fair Value								Fair Value
(in millions)	Notional/ Contract Amount (a)		Gross Derivative Assets			Gross Derivative Liabilities			Notional/ Contract Amount (a)		Gross Derivative Assets			Gross Derivative Liabilities
Risk management purposes
Derivatives designated as hedging instruments
Interest rate contracts:
Swaps - fair value - receive fixed/pay floating	$	1,800	$	164		$	2		$	1,450	$	198		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	426		1			4			253		1			—
Total risk management purposes	2,226		165			6			1,703		199			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	277		—			—			277		—			1
Caps and floors purchased	277		—			—			277		1			—
Swaps	11,403		142			95			11,143		181			132
Total interest rate contracts	11,957		142			95			11,697		182			133
Energy contracts:
Caps and floors written	1,349		3			40			1,325		1			48
Caps and floors purchased	1,349		40			3			1,325		48			1
Swaps	2,483		43			42			2,724		56			53
Total energy contracts	5,181		86			85			5,374		105			102
Foreign exchange contracts:
Spot, forwards, options and swaps	2,032		27			24			1,764		14			14
Total customer-initiated and other activities	19,170		255			204			18,835		301			249
Total gross derivatives	$	21,396	420			210			$	20,538	500			249
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(123		)	(123		)			(187		)	(187		)
Netting adjustment - Cash collateral received/posted			(11		)	—					(2		)	(10		)
Net derivatives included in the consolidated balance sheets (b)			286			87					311			52
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(121		)	(1		)			(138		)	(10		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	165		$	86				$	173		$	42

(a) Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

(b) Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $2 million at both September 30, 2014 and December 31, 2013.

Risk Management

As an end-user, the Corporation employs a variety of financial instruments for risk management purposes, including cash instruments, such as investment securities, as well as derivative instruments. Activity related to these instruments is centered predominantly in the interest rate markets and mainly involves interest rate swaps. Various other types of instruments also may

26

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

be used to manage exposures to market risks, including interest rate caps and floors, total return swaps, foreign exchange forward contracts and foreign exchange swap agreements.

As part of a fair value hedging strategy, the Corporation entered into interest rate swap agreements for interest rate risk management purposes. These interest rate swap agreements effectively modify the Corporation’s exposure to interest rate risk by converting fixed-rate debt to a floating rate. These agreements involve the receipt of fixed-rate interest amounts in exchange for floating-rate interest payments over the life of the agreement, without an exchange of the underlying principal amount. Risk management fair value interest rate swaps generated net interest income of $18 million for both the three-month periods ended September 30, 2014 and 2013 and $54 million for both the nine-month periods ended September 30, 2014 and 2013. The Corporation recognized $1 million of net losses in "other noninterest income" in the consolidated statements of comprehensive income for the ineffective portion of risk management derivative instruments designated as fair value hedges of fixed-rate debt for each of the three- and nine-month periods ended September 30, 2014 and an insignificant amount for each of the three- and nine-month periods ended September 30, 2013.

Foreign exchange rate risk arises from changes in the value of certain assets and liabilities denominated in foreign currencies. The Corporation employs spot and forward contracts in addition to swap contracts to manage exposure to these and other risks. The Corporation recognized an insignificant amount of net gains on risk management derivative instruments used as economic hedges in "other noninterest income" in the consolidated statements of comprehensive income for each of the three- and nine-month periods ended September 30, 2014 and 2013.

The following table summarizes the expected weighted average remaining maturity of the notional amount of risk management interest rate swaps and the weighted average interest rates associated with amounts expected to be received or paid on interest rate swap agreements as of September 30, 2014 and December 31, 2013.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
September 30, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,800	4.8	4.54	%	0.49	%
December 31, 2013
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,450		3.4	5.45		0.38

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at September 30, 2014 and December 31, 2013.

Management believes these hedging strategies achieve the desired relationship between the rate maturities of assets and funding sources which, in turn, reduce the overall exposure of net interest income to interest rate risk, although there can be no assurance that such strategies will be successful.

Customer-Initiated and Other

The Corporation enters into derivative transactions at the request of customers and generally takes offsetting positions with dealer counterparties to mitigate the inherent market risk. Income primarily results from the spread between the customer derivative and the offsetting dealer position.

For customer-initiated foreign exchange contracts where offsetting positions have not been taken, the Corporation manages the remaining inherent market risk through individual foreign currency position limits and aggregate value-at-risk limits. These limits are established annually and reviewed quarterly. For those customer-initiated derivative contracts which were not offset or where the Corporation holds a speculative position within the limits described above, the Corporation recognized $1 million of net gains in “other noninterest income” in the consolidated statements of comprehensive income for each of the three- and nine-month periods ended September 30, 2014 and an insignificant amount for each of the three- and nine-month periods ended September 30, 2013.

27

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Fair values of customer-initiated and other derivative instruments represent the net unrealized gains or losses on such contracts and are recorded in the consolidated balance sheets. Changes in fair value are recognized in the consolidated statements of comprehensive income. The net gains recognized in income on customer-initiated derivative instruments, net of the impact of offsetting positions, were as follows.

		Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	Location of Gain	2014		2013		2014		2013
Interest rate contracts	Other noninterest income	$	3	$	8	$	11	$	17
Energy contracts	Other noninterest income	1		—		1		2
Foreign exchange contracts	Foreign exchange income	9		8		29		26
Total		$	13	$	16	$	41	$	45

Credit-Related Financial Instruments

The Corporation issues off-balance sheet financial instruments in connection with commercial and consumer lending activities. The Corporation’s credit risk associated with these instruments is represented by the contractual amounts indicated in the following table.

(in millions)	September 30, 2014		December 31, 2013
Unused commitments to extend credit:
Commercial and other	$	28,158	$	27,728
Bankcard, revolving check credit and home equity loan commitments	2,138		1,889
Total unused commitments to extend credit	$	30,296	$	29,617
Standby letters of credit	$	3,942	$	4,297
Commercial letters of credit	65		103
Other credit-related financial instruments	3		2

The Corporation maintains an allowance to cover probable credit losses inherent in lending-related commitments, including unused commitments to extend credit, letters of credit and financial guarantees. At September 30, 2014 and December 31, 2013, the allowance for credit losses on lending-related commitments, included in “accrued expenses and other liabilities” on the consolidated balance sheets, was $43 million and $36 million, respectively.

Unused Commitments to Extend Credit

Commitments to extend credit are legally binding agreements to lend to a customer, provided there is no violation of any condition established in the contract. These commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Corporation. Commercial and other unused commitments are primarily variable rate commitments. The allowance for credit losses on lending-related commitments included $30 million and $28 million at September 30, 2014 and December 31, 2013, respectively, for probable credit losses inherent in the Corporation’s unused commitments to extend credit.

Standby and Commercial Letters of Credit

Standby letters of credit represent conditional obligations of the Corporation which guarantee the performance of a customer to a third party. Standby letters of credit are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing and similar transactions. Commercial letters of credit are issued to finance foreign or domestic trade transactions. These contracts expire in decreasing amounts through the year 2022. The Corporation may enter into participation arrangements with third parties that effectively reduce the maximum amount of future payments which may be required under standby and commercial letters of credit. These risk participations covered $308 million and $259 million, respectively, of the $4.0 billion and $4.4 billion standby and commercial letters of credit outstanding at September 30, 2014 and December 31, 2013, respectively.

The carrying value of the Corporation’s standby and commercial letters of credit, included in “accrued expenses and other liabilities” on the consolidated balance sheets, totaled $60 million at September 30, 2014, including $47 million in deferred fees and $13 million in the allowance for credit losses on lending-related commitments. At December 31, 2013, the comparable amounts were $59 million, $51 million and $8 million, respectively.

The following table presents a summary of criticized standby and commercial letters of credit at September 30, 2014 and December 31, 2013. The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful

28

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines.

(dollar amounts in millions)	September 30, 2014			December 31, 2013
Total criticized standby and commercial letters of credit	$	102		$	69
As a percentage of total outstanding standby and commercial letters of credit	2.5		%	1.6		%

Other Credit-Related Financial Instruments

The Corporation enters into credit risk participation agreements, under which the Corporation assumes credit exposure associated with a borrower’s performance related to certain interest rate derivative contracts. The Corporation is not a party to the interest rate derivative contracts and only enters into these credit risk participation agreements in instances in which the Corporation is also a party to the related loan participation agreement for such borrowers. The Corporation manages its credit risk on the credit risk participation agreements by monitoring the creditworthiness of the borrowers, which is based on the normal credit review process had it entered into the derivative instruments directly with the borrower. The notional amount of such credit risk participation agreement reflects the pro-rata share of the derivative instrument, consistent with its share of the related participated loan. As of September 30, 2014 and December 31, 2013, the total notional amount of the credit risk participation agreements was approximately $527 million and $614 million, respectively, and the fair value, included in customer-initiated interest rate contracts recorded in "accrued expenses and other liabilities" on the consolidated balance sheets, was insignificant for each period. The maximum estimated exposure to these agreements, as measured by projecting a maximum value of the guaranteed derivative instruments, assuming 100 percent default by all obligors on the maximum values, was approximately $5 million and $7 million at September 30, 2014 and December 31, 2013, respectively. In the event of default, the lead bank has the ability to liquidate the assets of the borrower, in which case the lead bank would be required to return a percentage of the recouped assets to the participating banks. As of September 30, 2014, the weighted average remaining maturity of outstanding credit risk participation agreements was 2.8 years.

In 2008, the Corporation sold its remaining ownership of Visa Class B shares and entered into a derivative contract. Under the terms of the derivative contract, the Corporation will compensate the counterparty primarily for dilutive adjustments made to the conversion factor of the Visa Class B shares to Class A shares based on the ultimate outcome of litigation involving Visa. Conversely, the Corporation will be compensated by the counterparty for any increase in the conversion factor from anti-dilutive adjustments. The notional amount of the derivative contract was equivalent to approximately 780,000 Visa Class B shares. The fair value of the derivative liability, included in "accrued expenses and other liabilities" on the consolidated balance sheets, was $3 million and $2 million at September 30, 2014 and December 31, 2013, respectively.

NOTE 6 - VARIABLE INTEREST ENTITIES (VIEs)

The Corporation evaluates its interest in certain entities to determine if these entities meet the definition of a VIE and whether the Corporation is the primary beneficiary and should consolidate the entity based on the variable interests it held both at inception and when there is a change in circumstances that requires a reconsideration.

The Corporation holds ownership interests in funds in the form of limited partnerships or limited liability companies (LLCs) investing in affordable housing projects that qualify for the LIHTC. The Corporation also directly invests in limited partnerships and LLCs which invest in community development projects which generate similar tax credits to investors. As an investor, the Corporation obtains income tax credits and deductions from the operating losses of these tax credit entities. These tax credit entities meet the definition of a VIE; however, the Corporation is not the primary beneficiary of the entities, as the general partner or the managing member has both the power to direct the activities that most significantly impact the economic performance of the entities and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. While the partnership/LLC agreements allow the limited partners/investor members, through a majority vote, to remove the general partner/managing member, this right is not deemed to be substantive as the general partner/managing member can only be removed for cause.

The Corporation accounts for its interests in LIHTC entities using the proportional amortization method. Exposure to loss as a result of the Corporation’s involvement with LIHTC entities at September 30, 2014 was limited to approximately $379 million. Ownership interests in other community development projects which generate similar tax credits to investors (other tax credit entities) are accounted for under either the cost or equity method. Exposure to loss as a result of the Corporation's involvement in other tax credit entities at September 30, 2014 was limited to approximately $10 million.

Investment balances, including all legally binding commitments to fund future investments, are included in “accrued income and other assets” on the consolidated balance sheets. A liability is recognized in “accrued expenses and other liabilities” on the consolidated balance sheets for all legally binding unfunded commitments to fund tax credit entities ($131 million at

29

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

September 30, 2014). Amortization and other write-downs of LIHTC investments are presented on a net basis as a component of the "provision for income taxes" on the consolidated statements of comprehensive income, while amortization and write-downs of other tax credit investments are recorded in “other noninterest income." The income tax credits and deductions are recorded as a reduction of income tax expense and a reduction of federal income taxes payable.

The Corporation provided no financial or other support that was not contractually required to any of the above VIEs during the nine months ended September 30, 2014 and 2013.

The following table summarizes the impact of these tax credit entities on line items on the Corporation’s consolidated statements of comprehensive income.

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Other noninterest income:
Amortization of other tax credit investments	$	(2	)	$	—		$	(5	)	$	—
Provision for income taxes:
Amortization of LIHTC investments	15			14			43			41
Low income housing tax credits	(15		)	(14		)	(43		)	(42		)
Other tax benefits related to tax credit entities	(6		)	(5		)	(19		)	(15		)
Total provision for income taxes	$	(6	)	$	(5	)	(19		)	(16		)

For further information on the Corporation’s consolidation policy, see Note 1 to these unaudited consolidated financial statements and Note 1 to the consolidated financial statements in the Corporation's 2013 Annual Report.

NOTE 7 - MEDIUM- AND LONG-TERM DEBT

Medium- and long-term debt is summarized as follows:

(in millions)	September 30, 2014		December 31, 2013
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	308	$	318
3.80% subordinated notes due 2026 (a)	249		—
Medium-term notes:
3.00% notes due 2015	299		299
2.125% notes due 2019 (a)	346		—
Total parent company	1,202		617
Subsidiaries
Subordinated notes:
5.70% subordinated notes due 2014 (a)	—		255
8.375% subordinated notes called 2014	—		183
5.75% subordinated notes due 2016 (a)	672		681
5.20% subordinated notes due 2017 (a)	551		566
7.875% subordinated notes due 2026 (a)	221		213
Total subordinated notes	1,444		1,898
Federal Home Loan Bank advance:
Floating-rate based on LIBOR indices due 2014	—		1,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	23		28
Total subsidiaries	1,467		2,926
Total medium- and long-term debt	$	2,669	$	3,543

(a) The carrying value of medium- and long-term debt has been adjusted to reflect the gain or loss attributable to the risk hedged with interest rate swaps.

Subordinated notes with remaining maturities greater than one year qualify as Tier 2 capital.

Comerica Bank (the Bank) is a member of the FHLB, which provides short- and long-term funding to its members through advances collateralized by real estate-related assets. Actual borrowing capacity is contingent on the amount of collateral available

30

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

to be pledged to the FHLB. At September 30, 2014, $14 billion of real estate-related loans were pledged to the FHLB as blanket collateral for potential future borrowings.

In the second quarter 2014, the Corporation issued $350 million of 2.125% senior notes due 2019, which were swapped to a floating rate based on six-month LIBOR. Proceeds were used for general corporate purposes.

In the third quarter 2014, the Corporation issued $250 million of 3.80% subordinated notes due 2026, which were swapped to a floating rate based on six-month LIBOR. Proceeds were used for general corporate purposes. Also in the third quarter 2014, the Corporation exercised its option to redeem, at par, $150 million of 8.375% subordinated notes, originally due in 2024. A gain of $32 million was recognized on the early redemption, primarily from the recognition of the unamortized value of a related, previously terminated interest rate swap.

NOTE 8 - ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the nine months ended September 30, 2014 and 2013, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Nine Months Ended September 30,
(in millions)	2014			2013
Accumulated net unrealized gains (losses) on investment securities available-for-sale:
Balance at beginning of period, net of tax	$	(68	)	$	150
Net unrealized holding gains (losses) arising during the period	85			(270		)
Less: Provision (benefit) for income taxes	30			(100		)
Net unrealized holding gains (losses) arising during the period, net of tax	55			(170		)
Less:
Net realized gains included in net securities gains	1			1
Less: Provision for income taxes	—			—
Reclassification adjustment for net securities gains included in net income, net of tax	1			1
Change in net unrealized gains (losses) on investment securities available-for-sale, net of tax	54			(171		)
Balance at end of period, net of tax	$	(14	)	$	(21	)
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(323	)	$	(563	)
Amortization of actuarial net loss	30			65
Amortization of prior service cost	1			2
Amounts recognized in salaries and benefits expense	31			67
Less: Provision for income taxes	11			24
Change in defined benefit pension and other postretirement plans adjustment, net of tax	20			43
Balance at end of period, net of tax	$	(303	)	$	(520	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(317	)	$	(541	)

31

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

NOTE 9 - NET INCOME PER COMMON SHARE

Basic and diluted net income per common share are presented in the following table.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share data)	2014		2013		2014		2013
Basic and diluted
Net income	$	154	$	147	$	444	$	424
Less:
Income allocated to participating securities	2		2		6		6
Net income attributable to common shares	$	152	$	145	$	438	$	418
Basic average common shares	179		182		179		184
Basic net income per common share	$	0.85	$	0.80	$	2.44	$	2.28
Basic average common shares	179		182		179		184
Dilutive common stock equivalents:
Net effect of assumed exercise of stock options	2		1		2		1
Net effect of the assumed exercise of warrants	4		4		5		2
Diluted average common shares	185		187		186		187
Diluted net income per common share	$	0.82	$	0.78	$	2.35	$	2.23

The following average shares related to outstanding options to purchase shares of common stock were not included in the computation of diluted net income per common share because the prices of the options were greater than the average market price of common shares for the period.

	Three Months Ended September 30,		Nine Months Ended September 30,
(shares in millions)	2014	2013	2014	2013
Average outstanding options	6.0	8.2	7.3	11.8
Range of exercise prices	$50.87 - $60.82	$41.70 - $61.94	$48.17 - $61.94	$34.78 - $61.94

NOTE 10 - EMPLOYEE BENEFIT PLANS

Net periodic benefit costs are charged to "employee benefits expense" on the consolidated statements of comprehensive income. The components of net periodic benefit cost for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows.

Qualified Defined Benefit Pension Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Service cost	$	7		$	9		$	22		$	28
Interest cost	22			20			66			59
Expected return on plan assets	(33		)	(33		)	(99		)	(99		)
Amortization of prior service cost	1			1			4			3
Amortization of net loss	9			18			24			56
Net periodic defined benefit cost	$	6		$	15		$	17		$	47

Non-Qualified Defined Benefit Pension Plan	Three Months Ended September 30,					Nine Months Ended September 30,
(in millions)	2014			2013		2014			2013
Service cost	$	1		$	1	$	3		$	3
Interest cost	2			2		7			7
Amortization of prior service cost (credit)	(1		)	—		(3		)	(1		)
Amortization of net loss	2			3		5			8
Net periodic defined benefit cost	$	4		$	6	$	12		$	17

32

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Postretirement Benefit Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Interest cost	$	—		$	1		$	2		$	3
Expected return on plan assets	(1		)	(1		)	(3		)	(3		)
Amortization of net loss	1			—			1			1
Net periodic postretirement benefit cost	$	—		$	—		$	—		$	1

For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2013 Annual Report.

NOTE 11 - INCOME TAXES AND TAX-RELATED ITEMS

At September 30, 2014, net unrecognized tax benefits were $14 million, compared to $11 million at December 31, 2013. The increase in unrecognized tax benefits of $3 million was primarily the result of the recognition of federal audit adjustments. The Corporation anticipates that it is reasonably possible that final settlement of federal and state tax issues will result in a decrease in net unrecognized tax benefits of $9 million within the next twelve months. Included in "accrued expense and other liabilities" on the consolidated balance sheets was a $2 million liability for tax-related interest and penalties at both September 30, 2014 and December 31, 2013.

Net deferred tax assets were $200 million at September 30, 2014, compared to $256 million at December 31, 2013. The decrease of $56 million in net deferred tax assets resulted primarily from a decrease in unrealized losses on investment securities available-for-sale recognized in other comprehensive income. Deferred tax assets were evaluated for realization and it was determined that no valuation allowance was needed at both September 30, 2014 and December 31, 2013. This conclusion was based on available evidence of loss carryback capacity, projected future reversals of existing taxable temporary differences and assumptions made regarding future events.

In the ordinary course of business, the Corporation enters into certain transactions that have tax consequences. From time to time, the Internal Revenue Service (IRS) may review and/or challenge specific interpretive tax positions taken by the Corporation with respect to those transactions. The Corporation believes that its tax returns were filed based upon applicable statutes, regulations and case law in effect at the time of the transactions. The IRS, an administrative authority or a court, if presented with the transactions, could disagree with the Corporation’s interpretation of the tax law.

Based on current knowledge and probability assessment of various potential outcomes, the Corporation believes that current tax reserves are adequate, and the amount of any potential incremental liability arising is not expected to have a material adverse effect on the Corporation’s consolidated financial condition or results of operations. Probabilities and outcomes are reviewed as events unfold, and adjustments to the reserves are made when necessary.

NOTE 12 - CONTINGENT LIABILITIES

Legal Proceedings

As previously reported in the Corporation's Form 10-K for the year ended December 31, 2013 and Forms 10-Q for the quarterly periods ended March 31, 2014 and June 30, 2014, Comerica Bank, a wholly owned subsidiary of the Corporation, was sued in November 2011 as a third-party defendant in Butte Local Development v. Masters Group v. Comerica Bank (“the case”), for lender liability. The case was tried in January 2014, in the Montana Second District Judicial Court for Silver Bow County in Butte, Montana ("the court"). On January 17, 2014, a jury awarded Masters $52 million against the Bank. Following the jury’s decision on the case, the Corporation increased its reserve for litigation-related expense, effective as of December 31, 2013, to $52 million. The Corporation increased its reserve related to the case to $54 million in March 2014, to include additional attorney's fees and costs awarded by the court.

The Corporation believes that it has meritorious defenses and appellate issues for this litigation and has appealed to the Montana Supreme Court, the sole appellate court for the state of Montana. The Montana Supreme Court heard oral arguments in September 2014 and will be rendering a written decision on the appeal.

The Corporation and certain of its subsidiaries are subject to various other pending or threatened legal proceedings arising out of the normal course of business or operations. The Corporation believes it has meritorious defenses to the claims asserted against it in its other currently outstanding legal proceedings and, with respect to such legal proceedings, intends to continue to defend itself vigorously, litigating or settling cases according to management’s judgment as to what is in the best interests of the Corporation and its shareholders. Settlement may result from the Corporation's determination that it may be more prudent financially to settle, rather than litigate, and should not be regarded as an admission of liability. On at least a quarterly basis, the Corporation assesses its potential liabilities and contingencies in connection with outstanding legal proceedings utilizing the latest information

33

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

available. On a case-by-case basis, reserves are established for those legal claims for which it is probable that a loss will be incurred either as a result of a settlement or judgment, and the amount of such loss can be reasonably estimated. The actual costs of resolving these claims may be substantially higher or lower than the amounts reserved. Based on current knowledge, and after consultation with legal counsel, management believes that current reserves are adequate, and the amount of any incremental liability arising from these matters is not expected to have a material adverse effect on the Corporation’s consolidated financial condition, consolidated results of operations or consolidated cash flows. Legal fees of $8 million and $5 million were included in "other noninterest expenses" on the consolidated statements of income for the three-month periods ended September 30, 2014 and 2013, respectively, and $18 million and $19 million for the nine-month periods ended September 30, 2014 and 2013, respectively. For matters where a loss is not probable, the Corporation has not established legal reserves. The Corporation believes the estimate of the aggregate range of reasonably possible losses, in excess of reserves established, for all legal proceedings in which it is involved is from zero to approximately $44 million at September 30, 2014. This estimated aggregate range of reasonably possible losses is based upon currently available information for those proceedings in which the Corporation is involved, taking into account the Corporation’s best estimate of such losses for those cases for which such estimate can be made. For certain cases, the Corporation does not believe that an estimate can currently be made. The Corporation’s estimate involves significant judgment, given the varying stages of the proceedings (including the fact that many are currently in preliminary stages), the existence in certain proceedings of multiple defendants (including the Corporation) whose share of liability has yet to be determined, the numerous yet-unresolved issues in many of the proceedings (including issues regarding class certification and the scope of many of the claims) and the attendant uncertainty of the various potential outcomes of such proceedings. Accordingly, the Corporation’s estimate will change from time to time, and actual losses may be more or less than the current estimate.

In the event of unexpected future developments, it is possible that the ultimate resolution of these matters, if unfavorable, may be material to the Corporation's consolidated financial condition, consolidated results of operations or consolidated cash flows.

For information regarding income tax contingencies, refer to Note 11.

NOTE 13 - BUSINESS SEGMENT INFORMATION

The Corporation has strategically aligned its operations into three major business segments: the Business Bank, the Retail Bank and Wealth Management. These business segments are differentiated based on the type of customer and the related products and services provided. In addition to the three major business segments, the Finance Division is also reported as a segment. Business segment results are produced by the Corporation’s internal management accounting system. This system measures financial results based on the internal business unit structure of the Corporation. The performance of the business segments is not comparable with the Corporation's consolidated results and is not necessarily comparable with similar information for any other financial institution. 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. The management accounting system assigns balance sheet and income statement items to each business segment using certain methodologies, which are regularly reviewed and refined. These methodologies may be modified as the management accounting system is enhanced and changes occur in the organizational structure and/or product lines. For comparability purposes, amounts in all periods are based on business segments and methodologies in effect at September 30, 2014.

In the second quarter 2014, the Corporation enhanced the approach used to determine the standard reserve factors used in estimating the allowance for credit losses, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly. As a result, the current year provision for credit losses within each segment is not comparable to prior period amounts.

The following discussion provides information about the activities of each business segment. A discussion of the financial results and the factors impacting performance can be found in the section entitled "Business Segments" in the financial review.

The Business Bank meets the needs of middle market businesses, multinational corporations and governmental entities by offering various products and services, including commercial loans and lines of credit, deposits, cash management, capital market products, international trade finance, letters of credit, foreign exchange management services and loan syndication services.

The Retail Bank includes small business banking and personal financial services, consisting of consumer lending, consumer deposit gathering and mortgage loan origination. In addition to a full range of financial services provided to small business customers, this business segment offers a variety of consumer products, including deposit accounts, installment loans, credit cards, student loans, home equity lines of credit and residential mortgage loans.

34

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Wealth Management offers products and services consisting of fiduciary services, private banking, retirement services, investment management and advisory services, investment banking and brokerage services. This business segment also offers the sale of annuity products, as well as life, disability and long-term care insurance products.

The Finance segment includes the Corporation’s securities portfolio and asset and liability management activities. This segment is responsible for managing the Corporation’s funding, liquidity and capital needs, performing interest sensitivity analysis and executing various strategies to manage the Corporation’s exposure to liquidity, interest rate risk and foreign exchange risk.

The Other category includes discontinued operations, the income and expense impact of equity and cash, tax benefits not assigned to specific business segments, charges of an unusual or infrequent nature that are not reflective of the normal operations of the business segments and miscellaneous other expenses of a corporate nature.

For further information on the methodologies which form the basis for these results refer to Note 22 to the consolidated financial statements in the Corporation's 2013 Annual Report.

Business segment financial results are as follows:

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Nine Months Ended September 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	1,124		$	446		$	139		$	(485	)	$	19		$	1,243
Provision for credit losses	45			(2		)	(11		)	—			(7		)	25
Noninterest income	275			123			195			44			6			643
Noninterest expenses	441			524			239			(24		)	27			1,207
Provision (benefit) for income taxes (FTE)	311			16			38			(160		)	5			210
Net income (loss)	$	602		$	31		$	68		$	(257	)	$	—		$	444
Net credit-related charge-offs	$	16		$	7		$	1		$	—		$	—		$	24
Selected average balances:
Assets	$	37,094		$	6,074		$	4,981		$	11,070		$	6,117		$	65,336
Loans	36,124			5,406			4,797			—			—			46,327
Deposits	27,755			21,600			3,934			246			246			53,781
Statistical data:
Return on average assets (a)	2.17		%	0.19		%	1.81		%	N/M			N/M			0.91		%
Efficiency ratio (b)	31.56			91.81			71.95			N/M			N/M			63.99

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Nine Months Ended September 30, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	1,115		$	460		$	138		$	(492	)	$	23		$	1,244
Provision for credit losses	29			21			(8		)	—			(5		)	37
Noninterest income	287			132			191			47			6			663
Noninterest expenses	446			530			238			7			28			1,249
Provision (benefit) for income taxes (FTE)	312			14			35			(168		)	4			197
Net income (loss)	$	615		$	27		$	64		$	(284	)	$	2		$	424
Net credit-related charge-offs	$	37		$	18		$	5		$	—		$	—		$	60
Selected average balances:
Assets	$	35,694		$	5,967		$	4,785		$	11,553		$	5,708		$	63,707
Loans	34,626			5,278			4,629			—			—			44,533
Deposits	25,931			21,183			3,722			309			210			51,355
Statistical data:
Return on average assets (a)	2.30		%	0.17		%	1.78		%	N/M			N/M			0.89		%
Efficiency ratio (b)	31.78			89.19			72.64			N/M			N/M			65.45

(a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

(b)    Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

FTE – Fully Taxable Equivalent

N/M – not meaningful

35

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The Corporation operates in three primary markets - Texas, California, and Michigan, as well as in Arizona and Florida, with select businesses operating in several other states, and in Canada and Mexico. The Corporation produces market segment results for the Corporation’s three primary geographic markets as well as Other Markets. Other Markets includes Florida, Arizona, the International Finance division and businesses with a national perspective. The Finance & Other category includes the Finance segment and the Other category as previously described. Market segment results are provided as supplemental information to the business segment results and may not meet all operating segment criteria as set forth in GAAP. For comparability purposes, amounts in all periods are based on market segments and methodologies in effect at September 30, 2014.

A discussion of the financial results and the factors impacting performance can be found in the section entitled "Market Segments" in the financial review.

Market segment financial results are as follows:

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Nine Months Ended September 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	544		$	531		$	403		$	231		$	(466	)	$	1,243
Provision for credit losses	(13		)	39			32			(26		)	(7		)	25
Noninterest income	268			109			95			121			50			643
Noninterest expenses	487			299			274			144			3			1,207
Provision (benefit) for income taxes (FTE)	122			113			70			60			(155		)	210
Net income (loss)	$	216		$	189		$	122		$	174		$	(257	)	$	444
Net credit-related charge-offs (recoveries)	$	13		$	21		$	8		$	(18	)	$	—		$	24
Selected average balances:
Assets	$	13,797		$	15,543		$	11,525		$	7,284		$	17,187		$	65,336
Loans	13,400			15,259			10,829			6,839			—			46,327
Deposits	20,853			15,506			10,743			6,187			492			53,781
Statistical data:
Return on average assets (a)	1.32		%	1.52		%	1.36		%	3.19		%	N/M			0.91		%
Efficiency ratio (b)	59.87			46.74			55.02			41.12			N/M			63.99

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Nine Months Ended September 30, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	564		$	516		$	394		$	239		$	(469	)	$	1,244
Provision for credit losses	(16		)	22			31			5			(5		)	37
Noninterest income	268			113			100			129			53			663
Noninterest expenses	496			298			272			148			35			1,249
Provision (benefit) for income taxes (FTE)	125			115			67			54			(164		)	197
Net income (loss)	$	227		$	194		$	124		$	161		$	(282	)	$	424
Net credit-related charge-offs	$	10		$	30		$	7		$	13		$	—		$	60
Selected average balances:
Assets	$	13,936		$	14,072		$	10,774		$	7,664		$	17,261		$	63,707
Loans	13,508			13,826			10,064			7,135			—			44,533
Deposits	20,294			14,532			10,149			5,861			519			51,355
Statistical data:
Return on average assets (a)	1.42		%	1.66		%	1.46		%	2.80		%	N/M			0.89		%
Efficiency ratio (b)	59.52			47.39			54.96			40.22			N/M			65.45

(a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

(b)    Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

FTE – Fully Taxable Equivalent

N/M – not meaningful

36

ITEM 2.  Management's Discussion and Analysis of Financial Condition and Results of Operations

FORWARD-LOOKING STATEMENTS

This report includes forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. In addition, the Corporation may make other written and oral communications from time to time that contain such statements. All statements regarding the Corporation's expected financial position, strategies and growth prospects and general economic conditions expected to exist in the future are forward-looking statements. The words, "anticipates," "believes," "contemplates," "feels," "expects," "estimates," "seeks," "strives," "plans," "intends," "outlook," "forecast," "position," "target," "mission," "assume," "achievable," "potential," "strategy," "goal," "aspiration," "opportunity," "initiative," "outcome," "continue," "remain," "maintain," "on course," "trend," "objective," "looks forward," "projects," "models," and variations of such words and similar expressions, or future or conditional verbs such as "will," "would," "should," "could," "might," "can," "may" or similar expressions, as they relate to the Corporation or its management, are intended to identify forward-looking statements. These forward-looking statements are predicated on the beliefs and assumptions of the Corporation's management based on information known to the Corporation's management as of the date of this report and do not purport to speak as of any other date. Forward-looking statements may include descriptions of plans and objectives of the Corporation's management for future or past operations, products or services, and forecasts of the Corporation's revenue, earnings or other measures of economic performance, including statements of profitability, business segments and subsidiaries, estimates of credit trends and global stability. Such statements reflect the view of the Corporation's management as of this date with respect to future events and are subject to risks and uncertainties. Should one or more of these risks materialize or should underlying beliefs or assumptions prove incorrect, the Corporation's actual results could differ materially from those discussed. Factors that could cause or contribute to such differences are changes in general economic, political or industry conditions; changes in monetary and fiscal policies, including changes in interest rates; volatility and disruptions in global capital and credit markets; changes in the Corporation's credit rating; the interdependence of financial service companies; changes in regulation or oversight; unfavorable developments concerning credit quality; the effects of more stringent capital or liquidity requirements; declines or other changes in the businesses or industries of the Corporation's customers; operational difficulties, failure of technology infrastructure or information security incidents; the implementation of the Corporation's strategies and business initiatives; the Corporation's ability to utilize technology to efficiently and effectively develop, market and deliver new products and services; changes in the financial markets, including fluctuations in interest rates and their impact on deposit pricing; competitive product and pricing pressures among financial institutions within the Corporation's markets; changes in customer behavior; any future strategic acquisitions or divestitures; management's ability to maintain and expand customer relationships; management's ability to retain key officers and employees; the impact of legal and regulatory proceedings or determinations; the effectiveness of methods of reducing risk exposures; the effects of terrorist activities and other hostilities; the effects of catastrophic events including, but not limited to, hurricanes, tornadoes, earthquakes, fires and floods; changes in accounting standards and the critical nature of the Corporation's accounting policies. The Corporation cautions that the foregoing list of factors is not exclusive. For discussion of factors that may cause actual results to differ from expectations, please refer to our filings with the Securities and Exchange Commission. In particular, please refer to “Item 1A. Risk Factors” beginning on page 12 of Comerica's Annual Report on Form 10-K for the year ended December 31, 2013. Forward-looking statements speak only as of the date they are made. The Corporation does not undertake to update forward-looking statements to reflect facts, circumstances, assumptions or events that occur after the date the forward-looking statements are made. For any forward-looking statements made in this report or in any documents, the Corporation claims the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995.

37

RESULTS OF OPERATIONS

Net income for the three months ended September 30, 2014 was $154 million, an increase of $7 million from $147 million reported for the three months ended September 30, 2013. This increase was primarily the result of a $20 million decrease in noninterest expenses, a $2 million increase in net interest income and a $3 million decrease in the provision for credit losses, partially offset by a $13 million decrease in noninterest income. Net income per diluted common share was $0.82 for the three months ended September 30, 2014, compared to $0.78 for the same period one year ago. Third quarter results reflected a net benefit of $5 million, after tax, or $0.03 per share, from certain actions including a $32 million gain on the early redemption of debt, a $9 million contribution to the Comerica Charitable Foundation and other charges totaling $15 million intended to assist in partially offsetting headwinds from rising regulatory and technology demands. Average diluted common shares were 185 million and 187 million for the three-month periods ended September 30, 2014 and 2013, respectively.

Net income for the nine months ended September 30, 2014 was $444 million, an increase of $20 million from $424 million reported for the nine months ended September 30, 2013. The increase in net income was primarily the result of decreases of $42 million in noninterest expenses and $12 million in the provision for credit losses, partially offset by decreases of $20 million in noninterest income and $2 million in net interest income. Net income per diluted common share was $2.35 for the nine months ended September 30, 2014, compared to $2.23 for the same period one year ago. Average diluted common shares were 186 million and 187 million for the nine-month periods ended September 30, 2014 and 2013, respectively.

Full-Year and Fourth Quarter 2014 Outlook

Management expectations for full-year 2014 compared to full-year 2013 have not changed from the previously provided outlook, with the exception of the following:

• Average loans - previous outlook was for growth in average loans of 4 percent to 6 percent and now growth is expected to be in the middle of the range, or about 5 percent.

• Net interest income - previous outlook for purchase accounting accretion was $25 million to $30 million and now accretion is expected to be at the upper end of the range, or about $30 million.

For fourth quarter 2014 compared to third quarter 2014, management expects the following, assuming a continuation of the current economic and low-rate environment:

• Slight growth in average loans, reflecting a seasonal decline in Mortgage Banker Finance, a seasonal increase in National Dealer Services, and slight growth in our remaining business lines similar to the third quarter, with continued focus on pricing and structure discipline.

• Slight growth in net interest income, reflecting fourth quarter purchase accounting accretion of about $5 million. Loan growth approximately offsets continued pressure from low rate environment.

• Provision for credit losses to remain low, similar to the provisions in the first half of 2014.

• Noninterest income relatively stable, with stable customer-driven income and lower noncustomer-driven income.

• Noninterest expenses higher, reflecting higher technology and consulting expenses, a seasonal increase in benefits expense and certain fourth quarter actions expected to result in additional charges of about $5 million to $7 million. Third quarter included a net benefit of $8 million from actions taken.

The Corporation early adopted an amendment to U.S. generally accepted accounting principles in the first quarter 2014 related to the accounting for affordable housing projects that qualify for the low-income housing tax credit. Amortization of the initial investment cost of qualifying projects is now recorded in the provision for income taxes together with the tax credits and benefits received. Previously, the amortization was recorded as a reduction to other noninterest income. All prior period amounts in this financial review have been restated to reflect the adoption of the amendment, which resulted in offsetting increases to other noninterest income and the provision for income taxes of $14 million and $41 million for the three- and nine-month periods ended September 30, 2013, respectively ($56 million for full-year 2013). The adoption had no impact on net income for any period presented.

38

Net Interest Income

The "Quarterly Analysis of Net Interest Income & Rate/Volume - Fully Taxable Equivalent" table that follows provides an analysis of net interest income (FTE) for the three months ended September 30, 2014 and 2013 and details the components of the change in net interest income on a FTE basis for the three months ended September 30, 2014 compared to the same period in the prior year.

Quarterly Analysis of Net Interest Income & Rate/Volume - Fully Taxable Equivalent (FTE)

	Three Months Ended
	September 30, 2014							September 30, 2013
(dollar amounts in millions)	Average Balance			Interest		Average Rate		Average Balance			Interest		Average Rate
Commercial loans	$	30,188		$	236	3.11	%	$	27,759		$	226	3.25	%
Real estate construction loans	1,973			17		3.41		1,522			15		3.78
Commercial mortgage loans	8,698			76		3.45		8,943			88		3.90
Lease financing	823			4		2.33		839			7		3.21
International loans	1,417			13		3.59		1,252			12		3.76
Residential mortgage loans	1,792			17		3.76		1,642			17		3.98
Consumer loans	2,268			19		3.24		2,137			17		3.27
Total loans (a)	47,159			382		3.22		44,094			382		3.44
Mortgage-backed securities available-for-sale	9,020			52		2.29		8,989			54		2.41
Other investment securities available-for-sale	368			—		0.43		391			—		0.43
Total investment securities available-for-sale	9,388			52		2.22		9,380			54		2.32
Interest-bearing deposits with banks (b)	5,015			3		0.25		5,308			4		0.26
Other short-term investments	110			—		0.54		110			—		0.77
Total earning assets	61,672			437		2.82		58,892			440		2.97
Cash and due from banks	963							1,027
Allowance for loan losses	(601		)					(622		)
Accrued income and other assets	4,367							4,360
Total assets	$	66,401						$	63,657
Money market and interest-bearing checking deposits	$	23,146		6		0.11		$	21,894		7		0.13
Savings deposits	1,759			—		0.03		1,680			—		0.04
Customer certificates of deposit	4,824			4		0.36		5,384			6		0.41
Foreign office time deposits	159			1		1.43		528			—		0.48
Total interest-bearing deposits	29,888			11		0.15		29,486			13		0.18
Short-term borrowings	231			—		0.03		249			—		0.06
Medium- and long-term debt	2,652			11		1.75		3,590			14		1.54
Total interest-bearing sources	32,771			22		0.28		33,325			27		0.32
Noninterest-bearing deposits	25,275							22,379
Accrued expenses and other liabilities	944							1,033
Total shareholders’ equity	7,411							6,920
Total liabilities and shareholders’ equity	$	66,401						$	63,657
Net interest income/rate spread (FTE)				$	415	2.54					$	413	2.65
FTE adjustment				$	1						$	1
Impact of net noninterest-bearing sources of funds						0.13							0.14
Net interest margin (as a percentage of average earning assets) (FTE) (a) (b)						2.67	%						2.79	%

(a) Accretion of the purchase discount on the acquired loan portfolio of $3 million and $8 million in the three-month periods ended September 30, 2014 and 2013, respectively, increased the net interest margin by 2 basis points and 5 basis points in each respective period.

(b) Average balances deposited with the Federal Reserve Bank reduced the net interest margin by 21 basis points and 24 basis points in the three months ended September 30, 2014 and 2013, respectively.

39

Quarterly Analysis of Net Interest Income & Rate/Volume - Fully Taxable Equivalent (FTE) (continued)

	Three Months Ended
	September 30, 2014/September 30, 2013
(in millions)	Increase (Decrease) Due to Rate			Increase (Decrease) Due to  Volume (a)			Net Increase (Decrease)
Interest Income (FTE):
Loans	$	(25	)	$	25		$	—
Investment securities available-for-sale	(2		)	—			(2		)
Interest-bearing deposits with banks	(1		)	—			(1		)
Total interest income (FTE)	(28		)	25			(3		)
Interest Expense:
Interest-bearing deposits	(1		)	(1		)	(2		)
Medium- and long-term debt	2			(5		)	(3		)
Total interest expense	1			(6		)	(5		)
Net interest income (FTE)	$	(29	)	$	31		$	2

(a) Rate/volume variances are allocated to variances due to volume.

Net interest income was $414 million for the three months ended September 30, 2014, an increase of $2 million compared to $412 million for the three months ended September 30, 2013. The increase in net interest income resulted primarily from the benefit provided by an increase in average earning assets and a decrease in funding costs, partially offset by a decrease in loan yields. Average earning assets increased $2.8 billion, or 5 percent, to $61.7 billion for the three months ended September 30, 2014, compared to $58.9 billion for the same period in 2013. The increase in average earning assets primarily reflected an increase of $3.1 billion in average loans, partially offset by a decrease of $293 million in average interest-bearing deposits with banks. The net interest margin (FTE) for the three months ended September 30, 2014 decreased 12 basis points to 2.67 percent, from 2.79 percent for the comparable period in 2013, primarily from decreased yields on loans and mortgage-backed investment securities, partially offset by the benefit from lower funding costs. The decrease in loan yields reflected shifts in the average loan portfolio mix, a decrease in accretion on the acquired loan portfolio, the impact of a competitive rate environment, the decline in LIBOR and positive credit quality migration throughout the portfolio, as well as the impact of a negative residual value adjustment to assets in the leasing portfolio. Yields on mortgage-backed investment securities decreased primarily due to the benefit of a cumulative retrospective premium adjustment to third quarter 2013 yields, with no similar adjustment in the third quarter 2014, partially offset by decreased premium amortization resulting from slower actual prepayments in third quarter 2014, compared to third quarter 2013. Average balances deposited with the Federal Reserve Bank (FRB) of $4.9 billion and $5.2 billion in the three months ended September 30, 2014 and 2013, respectively, included in "interest bearing deposits with banks" on the consolidated balance sheets, reduced the net interest margin by approximately 21 basis points and 24 basis points in each respective period.

40

The "Year-to-Date Analysis of Net Interest Income & Rate/Volume - Fully Taxable Equivalent" table that follows provides an analysis of net interest income (FTE) for the nine months ended September 30, 2014 and 2013 and details the components of the change in net interest income on a FTE basis for the nine months ended September 30, 2014 compared to the same period in the prior year.

Year-to-Date Analysis of Net Interest Income & Rate/Volume - Fully Taxable Equivalent (FTE)

	Nine Months Ended
	September 30, 2014							September 30, 2013
(dollar amounts in millions)	Average Balance			Interest		Average Rate		Average Balance			Interest		Average Rate
Commercial loans	$	29,487		$	689	3.12	%	$	28,069		$	688	3.28	%
Real estate construction loans	1,905			49		3.42		1,430			43		3.98
Commercial mortgage loans	8,739			246		3.77		9,177			271		3.95
Lease financing	840			20		3.23		850			21		3.22
International loans	1,349			37		3.64		1,265			35		3.73
Residential mortgage loans	1,763			50		3.81		1,600			50		4.13
Consumer loans	2,244			54		3.21		2,142			53		3.32
Total loans (a)	46,327			1,145		3.30		44,533			1,161		3.49
Mortgage-backed securities available-for-sale	8,976			159		2.36		9,339			158		2.29
Other investment securities available-for-sale	369			1		0.44		390			1		0.48
Total investment securities available-for-sale	9,345			160		2.28		9,729			159		2.21
Interest-bearing deposits with banks (b)	4,803			9		0.25		4,433			9		0.26
Other short-term investments	110			—		0.60		115			1		1.38
Total earning assets	60,585			1,314		2.90		58,810			1,330		3.03
Cash and due from banks	932							993
Allowance for loan losses	(602		)					(627		)
Accrued income and other assets	4,421							4,531
Total assets	$	65,336						$	63,707
Money market and interest-bearing checking deposits	$	22,571		18		0.11		$	21,594		22		0.13
Savings deposits	1,734			—		0.03		1,654			—		0.03
Customer certificates of deposit	4,990			13		0.36		5,603			19		0.44
Foreign office time deposits	304			2		0.68		513			2		0.54
Total interest-bearing deposits	29,599			33		0.15		29,364			43		0.19
Short-term borrowings	209			—		0.03		189			—		0.07
Medium- and long-term debt	3,062			38		1.67		4,109			43		1.42
Total interest-bearing sources	32,870			71		0.29		33,662			86		0.34
Noninterest-bearing deposits	24,182							21,991
Accrued expenses and other liabilities	960							1,104
Total shareholders’ equity	7,324							6,950
Total liabilities and shareholders’ equity	$	65,336						$	63,707
Net interest income/rate spread (FTE)				$	1,243	2.61					$	1,244	2.69
FTE adjustment				$	3						$	2
Impact of net noninterest-bearing sources of funds						0.13							0.14
Net interest margin (as a percentage of average earning assets) (FTE) (a) (b)						2.74	%						2.83	%

(a) Accretion of the purchase discount on the acquired loan portfolio of $25 million and $26 million in the nine months ended September 30, 2014 and 2013, respectively, increased the net interest margin by 6 basis points in each period.

(b) Average balances deposited with the Federal Reserve Bank reduced the net interest margin by 20 basis points in both the nine-month periods ended September 30, 2014 and 2013.

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Year-to-Date Analysis of Net Interest Income & Rate/Volume - Fully Taxable Equivalent (FTE) (continued)

	Nine Months Ended
	September 30, 2014/September 30, 2013
(in millions)	Increase (Decrease) Due to Rate			Increase (Decrease) Due to  Volume (a)			Net Increase (Decrease)
Interest Income (FTE):
Loans	$	(58	)	$	42		$	(16	)
Investment securities available-for-sale	4			(3		)	1
Other short-term investments	(1		)	—			(1		)
Total interest income (FTE)	(55		)	39			(16		)
Interest Expense:
Interest-bearing deposits	(8		)	(2		)	(10		)
Medium- and long-term debt	8			(13		)	(5		)
Total interest expense	—			(15		)	(15		)
Net interest income (FTE)	$	(55	)	$	54		$	(1	)

(a) Rate/volume variances are allocated to variances due to volume.

Net interest income was $1.2 billion for the nine months ended September 30, 2014, a decrease of $2 million compared to the same period in 2013. The decrease in net interest income resulted primarily from a decrease in loan yields, partially offset by the benefit provided by an increase in average loans and a decrease in funding costs. Average earning assets increased $1.8 billion, or 3 percent, to $60.6 billion for the nine months ended September 30, 2014, compared to $58.8 billion for the same period in 2013. The increase in average earning assets primarily reflected increases of $1.8 billion in average loans and $370 million in average interest-bearing deposits with banks, partially offset by a decrease of $384 million in average investment securities available-for-sale. The net interest margin (FTE) for the nine months ended September 30, 2014 decreased 9 basis points to 2.74 percent, from 2.83 percent for the comparable period in 2013, due to decreased yields on loans, partially offset by improved yields on mortgage-backed investment securities and the benefit from lower funding costs. The decrease in loan yields was primarily the result of the same reasons discussed in the quarterly analysis above, with the exception of the impact of accretion on the acquired portfolio, which was largely neutral to the change in loan yields for the nine months ended September 30, 2014 compared to the same period in 2013. The increase in mortgage-backed investment securities yields was primarily due to decreased premium amortization resulting from slower prepayment speeds. Average balances deposited with the FRB of $4.7 billion and $4.3 billion in the nine months ended September 30, 2014 and 2013, respectively, included in "interest bearing deposits with banks" on the consolidated balance sheets, reduced the net interest margin by approximately 20 basis points in each respective period.

For further discussion of the effects of market rates on net interest income, refer to the "Market and Liquidity Risk" section of this financial review.

Provision for Credit Losses

The provision for credit losses was $5 million and $8 million for the three-month periods ended September 30, 2014 and 2013, respectively, and $25 million and $37 million for the nine-month periods ended September 30, 2014 and 2013, respectively. The provision for credit losses includes both the provision for loan losses and the provision for credit losses on lending-related commitments.

The provision for loan losses is recorded to maintain the allowance for loan losses at the level deemed appropriate by the Corporation to cover probable credit losses inherent in the portfolio. For a discussion of the allowance for loan losses and the methodology used in the determination of the allowance for loan losses, refer to the "Credit Risk" and "Critical Accounting Policies" sections of this financial review. The provision for loan losses was $4 million for the three months ended September 30, 2014, compared to $10 million for the three months ended September 30, 2013, and was $18 million for the nine months ended September 30, 2014 compared to $35 million for the same period in the prior year. Credit quality in the loan portfolio continued to improve in the three- and nine-month periods ended September 30, 2014, compared to the same periods in the prior year. Improvements in credit quality included a decline of $367 million in the Corporation's criticized loan list from September 30, 2013 to September 30, 2014. Reflected in the decline in criticized loans was a decrease in nonaccrual loans of $108 million. The Corporation's criticized loan list is consistent with loans in the Special Mention, Substandard and Doubtful categories defined by regulatory authorities.

Net loan charge-offs in the three months ended September 30, 2014 decreased $16 million to $3 million, or 0.03 percent of average total loans, compared to $19 million, or 0.18 percent, for the three months ended September 30, 2013. The $16 million decrease in net loan charge-offs in the three months ended September 30, 2014, compared to the same period in 2013, primarily reflected decreases in Commercial Real Estate, Retail Banking and Small Business, partially offset by increases in Technology and Life Sciences, Private Banking and general Middle Market.

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Net loan charge-offs in the nine months ended September 30, 2014 decreased $36 million to $24 million, or 0.07 percent of average total loans, compared to $60 million, or 0.18 percent, for the nine months ended September 30, 2013. The $36 million decrease in net loan charge-offs in the nine months ended September 30, 2014, compared to the same period in 2013, reflected decreases in most business lines, with the largest decreases in general Middle Market, Commercial Real Estate, Small Business and Corporate Banking, partially offset by an increase in Technology and Life Sciences.

The provision for credit losses on lending-related commitments is recorded to maintain the allowance for credit losses on lending-related commitments at the level deemed appropriate by the Corporation to cover probable credit losses inherent in lending-related commitments. The provision for credit losses on lending-related commitments was $1 million in the three months ended September 30, 2014, compared to a benefit of $2 million in the three months ended September 30, 2013 and was $7 million for the nine months ended September 30, 2014 compared to $2 million for the same period in 2013. The $3 million increase in the provision for credit losses on lending-related commitments in the three months ended September 30, 2014 compared to the same period in 2013, primarily reflected an increase in the provision for letters of credit. The $5 million increase in the provision for credit losses on lending-related commitments in the nine months ended September 30, 2014 compared to the same period in 2013 primarily reflected the impact of a second quarter 2013 reduction of specific reserves on unfunded lending commitments. Lending-related commitment charge-offs were insignificant for the three- and nine-month periods ended September 30, 2014.

An analysis of the allowance for credit losses and nonperforming assets is presented under the "Credit Risk" subheading in the "Risk Management" section of this financial review.

Noninterest Income

	Three Months Ended September 30,					Nine Months Ended September 30,
(in millions)	2014			2013		2014		2013
Customer-driven income:
Service charges on deposit accounts	$	54		$	53	$	162	$	161
Fiduciary income	44			41		133		128
Commercial lending fees	26			28		69		71
Card fees	20			20		59		55
Letter of credit fees	14			17		43		49
Foreign exchange income	9			9		30		27
Brokerage fees	4			4		13		14
Other customer-driven income (a)	19			23		59		67
Total customer-driven noninterest income	190			195		568		572
Noncustomer-driven income:
Bank-owned life insurance	11			12		31		31
Net securities (losses) gains	(1		)	1		—		(1		)
Other noncustomer-driven income (a)	15			20		44		61
Total noninterest income	$	215		$	228	$	643	$	663

(a) The table below provides further details on certain categories included in other noninterest income.

Noninterest income was $215 million for the three months ended September 30, 2014, a decrease of $13 million compared to $228 million for the same period in 2013. The decrease reflected a $5 million decrease in customer-driven income and an $8 million decrease in noncustomer-driven income. The $5 million decrease in customer-driven income primarily reflected a $4 million decrease in customer derivative income, a $3 million decrease in letter of credit fees and small decreases in several other categories, partially offset by a $3 million increase in fiduciary income. The $8 million decrease in noncustomer-driven income primarily reflected a $5 million decrease in warrant income and small decreases in most other categories, partially offset by a $3 million increase in deferred compensation asset returns.

Noninterest income was $643 million for the nine months ended September 30, 2014, a decrease of $20 million compared to $663 million for the same period in 2013, reflecting a $4 million decrease in customer-driven income and a $16 million decrease in noncustomer-driven income. The decrease in customer-driven income primarily reflected decreases of $7 million in customer derivative income and $6 million in letter of credit fees, partially offset by increases of $5 million in fiduciary income and $4 million in card fees. The $16 million decrease in noncustomer-driven income primarily reflected decreases of $7 million in income from the Corporation's third-party credit card provider, $4 million in securities trading income, $3 million in income from principal investing and warrants and small decreases in most other categories. The decrease in income from the Corporation's third-party credit card provider in part reflects a change in the timing of the recognition of incentives from annually to quarterly in the third quarter of 2013.

The following table illustrates certain categories included in "other noninterest income" on the consolidated statements of comprehensive income.

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	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2014		2013		2014		2013
Other noninterest income:
Other customer-driven income:
Investment banking fees	$	4	$	5	$	14	$	15
Customer derivative income	4		8		12		19
All other customer-driven income	11		10		33		33
Total other customer-driven income	19		23		59		67
Other noncustomer-driven income:
Securities trading income	3		3		7		11
Deferred compensation asset returns (a)	3		—		6		7
Income from principal investing and warrants	3		8		9		12
All other noncustomer-driven income	6		9		22		31
Total other noncustomer-driven income	15		20		44		61
Total other noninterest income	$	34	$	43	$	103	$	128

(a) Compensation deferred by the Corporation's officers is invested based on investment selections of the officers. Income earned on these assets is reported in noninterest income and the offsetting increase in liability is reported in salaries and benefits expense.

Noninterest Expenses

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Salaries and benefits expense	$	248		$	255		$	735		$	751
Net occupancy expense	46			41			125			119
Equipment expense	14			15			43			45
Outside processing fee expense	31			31			89			89
Software expense	25			22			72			66
Litigation-related expense	(2		)	(4		)	4			—
FDIC insurance expense	9			9			25			26
Advertising expense	5			6			16			18
Gain on debt redemption	(32		)	—			(32		)	(1		)
Other noninterest expenses	53			42			130			136
Total noninterest expenses	$	397		$	417		$	1,207		$	1,249

Noninterest expenses were $397 million for the three months ended September 30, 2014, a decrease of $20 million compared to $417 million for the three months ended September 30, 2013. Third quarter 2014 included certain actions that resulted in a net benefit to noninterest expenses of $8 million. These actions primarily included a $9 million contribution to the Comerica Charitable Foundation (in other noninterest expenses), a $32 million gain on the early redemption of debt, $6 million of severance-related expenses (in salaries and benefits expense) and $5 million of lease termination charges associated with real estate optimization (in net occupancy expense). Excluding these actions, noninterest expenses decreased $12 million, primarily due to a decrease in salaries and benefits expense, largely the result of decreases in pension and incentive expense, partially offset by the impact of merit increases.

Noninterest expenses were $1.2 billion for the nine months ended September 30, 2014, a decrease of $42 million compared to the same period in the prior year. Excluding the impact of the third quarter 2014 actions described above, noninterest expenses decreased $34 million, primarily reflecting a decrease in salaries and benefits expense, decreased expenses related to foreclosed properties (in other noninterest expenses) and small decreases in several other categories, partially offset by increases in software and litigation-related expenses. The decrease in salaries and benefits expense was primarily for the same reasons noted in the quarterly discussion above, as well as an increase in payroll tax expenses.

Provision for Income Taxes

The provision for income taxes was $73 million for the three months ended September 30, 2014 compared to $68 million for the three months ended September 30, 2013, and $207 million for the nine months ended September 30, 2014 compared to $195 million for the same period in the prior year. The increases in the provision for income taxes in both comparative periods were primarily due to increases in pretax income.

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STRATEGIC LINES OF BUSINESS

The Corporation's management accounting system assigns balance sheet and income statement items to each segment using certain methodologies, which are regularly reviewed and refined. These methodologies may be modified as the management accounting system is enhanced and changes occur in the organizational structure and/or product lines.

In the second quarter 2014, the Corporation enhanced the approach used to determine the standard reserve factors used in estimating the allowance for credit losses, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly. As a result, the current year provision for credit losses within each segment is not comparable to prior year amounts.

Business Segments

The Corporation's operations are strategically aligned into three major business segments: the Business Bank, the Retail Bank and Wealth Management. These business segments are differentiated based upon the products and services provided. In addition to the three major business segments, Finance is also reported as a segment. The Other category includes items not directly associated with these business segments or the Finance segment. The performance of the business segments is not comparable with the Corporation's consolidated results and is not necessarily comparable with similar information for any other financial institution. 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. Note 13 to the consolidated financial statements describes the business activities of each business segment and presents financial results of these business segments for the nine months ended September 30, 2014 and 2013.

The following table presents net income (loss) by business segment.

	Nine Months Ended September 30,
(dollar amounts in millions)	2014					2013
Business Bank	$	602		86	%	$	615		87	%
Retail Bank	31			4		27			4
Wealth Management	68			10		64			9
	701			100	%	706			100	%
Finance	(257		)			(284		)
Other (a)	—					2
Total	$	444				$	424

(a)    Includes items not directly associated with the three major business segments or the Finance Division.

The Business Bank's net income of $602 million for the nine months ended September 30, 2014 decreased $13 million compared to the nine months ended September 30, 2013. Net interest income (FTE) of $1.1 billion for the nine months ended September 30, 2014 increased $9 million compared to the same period in the prior year, primarily the result of the benefit from an increase in average loans of $1.5 billion, an increase in accretion of the purchase discount on the acquired loan portfolio and lower deposit costs, partially offset by lower loan yields. Average deposits increased $1.8 billion. The provision for credit losses increased $16 million to $45 million for the nine months ended September 30, 2014, compared to the same period in the prior year. Net credit-related charge-offs of $16 million decreased $21 million in the nine months ended September 30, 2014, compared to the nine months ended September 30, 2013, primarily reflecting decreases in general Middle Market, Commercial Real Estate, Corporate Banking and Environmental Services, partially offset by an increase in Technology and Life Sciences. Noninterest income of $275 million for the nine months ended September 30, 2014 decreased $12 million from the comparable period in the prior year, primarily reflecting a decrease of $6 million in letter of credit fees and small decreases in most other categories of noninterest income, partially offset by a $5 million increase in card fees. Noninterest expenses of $441 million for the nine months ended September 30, 2014 decreased $5 million compared to the same period in the prior year, primarily due to a $9 million decrease in salaries and benefits expense and a $7 million decrease in expenses related to foreclosed properties, partially offset by a $9 million increase in corporate overhead expense. The increase in overhead expenses was primarily related to certain actions taken in the third quarter 2014 including a contribution to the Comerica Charitable Foundation, charges associated with real estate optimization and several other efficiency-related actions.

Net income for the Retail Bank of $31 million for the nine months ended September 30, 2014 increased $4 million, compared to $27 million for the nine months ended September 30, 2013. Net interest income (FTE) of $446 million decreased $14 million in the nine months ended September 30, 2014, primarily due to lower loan yields, a decrease in accretion of the purchase discount on the acquired loan portfolio and a decrease in net funds transfer pricing (FTP) credits, partially offset by the benefit provided by a $128 million increase in average loans and lower deposit rates. Average deposits increased $417 million.

45

The provision for credit losses was a benefit of $2 million for the nine months ended September 30, 2014, a decrease of $23 million from the comparable period in the prior year. Net credit-related charge-offs of $7 million for the nine months ended September 30, 2014 decreased $11 million from the comparable period in the prior year, reflecting decreases in both Small Business and Retail Banking. Noninterest income of $123 million for the nine months ended September 30, 2014 decreased $9 million compared to the nine months ended September 30, 2013, primarily due to a $7 million decrease in income from the Corporation's third-party credit card provider, largely reflecting a change in the timing of the recognition of incentives from annually to quarterly in the third quarter of 2013. Noninterest expenses of $524 million for the nine months ended September 30, 2014 decreased $6 million from the comparable period in the prior year, primarily due to a $4 million decrease in salaries and benefits expense and small decreases in several other noninterest expense categories, partially offset by a $5 million increase in corporate overhead expense, for the same reasons as described above in the Business Bank discussion.

Wealth Management's net income of $68 million for the nine months ended September 30, 2014 increased $4 million, compared to $64 million for the nine months ended September 30, 2013. Net interest income (FTE) of $139 million for the nine months ended September 30, 2014 remained relatively stable compared to $138 million for the nine months ended September 30, 2013, as the benefit provided by a $168 million increase in average loans was largely offset by a decline in loan yields. Average deposits increased $212 million. The provision for credit losses was a benefit of $11 million for the nine months ended September 30, 2014, compared to a benefit of $8 million for the nine months ended September 30, 2013. Net credit-related charge-offs were $1 million for the nine months ended September 30, 2014, compared to $5 million for the nine months ended September 30, 2013. Noninterest income of $195 million increased $4 million from the comparable period in the prior year, primarily reflecting an $6 million increase in fiduciary income, partially offset by a $2 million decrease in securities trading income. Noninterest expenses of $239 million for the nine months ended September 30, 2014 increased $1 million primarily due to a $3 million increase in corporate overhead expense, partially offset by small decreases in several other noninterest expense categories. See the Business Bank discussion, above, for an explanation of the increase in corporate overhead expense.

The net loss in the Finance segment was $257 million for the nine months ended September 30, 2014, compared to a net loss of $284 million for the nine months ended September 30, 2013. Net interest expense (FTE) of $485 million for the nine months ended September 30, 2014 decreased $7 million, compared to the nine months ended September 30, 2013, primarily reflecting a decrease in net FTP expense as a result of lower net rates paid to the business segments under the Corporation's internal FTP methodology. A $31 million decrease in noninterest expenses was primarily the result of the third quarter 2014 gain of $32 million on the early redemption of debt.

Market Segments

Market segment results are provided for the Corporation's three largest geographic markets: Michigan, California and Texas. In addition to the three largest geographic markets, Other Markets is also reported as a market segment. The Finance & Other category includes the Finance segment and the Other category as previously described in the "Business Segments" section of this financial review. Note 13 to these consolidated financial statements presents a description of each of these market segments as well as the financial results for the nine months ended September 30, 2014 and 2013.

The following table presents net income (loss) by market segment.

	Nine Months Ended September 30,
(dollar amounts in millions)	2014					2013
Michigan	$	216		31	%	$	227		32	%
California	189			27		194			27
Texas	122			17		124			18
Other Markets	174			25		161			23
	701			100	%	706			100	%
Finance & Other (a)	(257		)			(282		)
Total	$	444				$	424

(a)    Includes items not directly associated with the market segments.

The Michigan market's net income of $216 million for the nine months ended September 30, 2014 decreased $11 million, compared to $227 million for the nine months ended September 30, 2013. Net interest income (FTE) of $544 million for the nine months ended September 30, 2014 decreased $20 million from the comparable period in the prior year, primarily due to lower loan yields, the impact of a $108 million decrease in average loans and a decrease in net FTP credits, partially offset by lower deposit rates. Average deposits increased $559 million. The provision for credit losses was a benefit of $13 million for the nine months ended September 30, 2014, a decrease of $3 million compared to the same period in the prior year. Net credit-related charge-offs were $13 million for the nine months ended September 30, 2014, compared to $10 million for the comparable period in the prior year, primarily reflecting an increase in Commercial Real Estate, partially offset by decreases in almost all other lines of business. Noninterest income of $268 million for the nine months ended September 30, 2014 was unchanged from the comparable period in 2013. Noninterest expenses of $487 million for the nine months ended September 30, 2014 decreased $9 million from

46

the comparable period in the prior year, primarily reflecting a $7 million decrease in salaries and benefits expense and small decreases in several noninterest expense categories, partially offset by a $5 million increase in corporate overhead expenses. See the Business Bank discussion, above, for an explanation of the increase in corporate overhead expense.

The California market's net income of $189 million decreased $5 million in the nine months ended September 30, 2014, compared to $194 million for the nine months ended September 30, 2013. Net interest income (FTE) of $531 million for the nine months ended September 30, 2014 increased $15 million from the comparable period in the prior year, primarily due to the benefit provided by a $1.4 billion increase in average loans and an increase in FTP credits, partially offset by lower loan yields. Average deposits increased $974 million. The provision for credit losses of $39 million in the nine months ended September 30, 2014 increased $17 million from the comparable period in the prior year. Net credit-related charge-offs of $21 million in the nine months ended September 30, 2014 decreased $9 million compared to the nine months ended September 30, 2013, primarily reflecting decreases in most lines of business, partially offset by an increase in Technology and Life Sciences. Noninterest income of $109 million for the nine months ended September 30, 2014 decreased $4 million compared to the nine months ended September 30, 2013, primarily due to a $3 million decrease in warrant income. Noninterest expenses of $299 million for the nine months ended September 30, 2014 increased $1 million from the comparable period in the prior year, primarily reflecting a $5 million increase in corporate overhead expenses and small increases in several other noninterest expense categories, partially offset by a $6 million decrease in salaries and benefits and a $5 million decrease in expenses related to foreclosed property. See the Business Bank discussion, above, for an explanation of the increase in corporate overhead expense.

The Texas market's net income of $122 million for the nine months ended September 30, 2014 decreased $2 million from $124 million for the nine months ended September 30, 2013. Net interest income (FTE) of $403 million for the nine months ended September 30, 2014 increased $9 million from the comparable period in the prior year, primarily due to the benefit provided by a $765 million increase in average loans, a decrease in net FTP charges and lower deposit rates, partially offset by lower loan yields. Average deposits increased $594 million. The provision for credit losses of $32 million for the nine months ended September 30, 2014 increased $1 million from the comparable period in the prior year. Net credit-related charge-offs of $8 million for the nine months ended September 30, 2014 increased $1 million from the comparable period in the prior year, primarily due to an increase in general Middle Market, partially offset by decreases in almost all other lines of business. Noninterest income of $95 million for the nine months ended September 30, 2014 decreased $5 million compared to the comparable period in the prior year, primarily due to a decrease in syndication agent fees, a component of commercial lending fees. Noninterest expenses of $274 million for the nine months ended September 30, 2014 increased $2 million compared to the nine months ended September 30, 2013, primarily due to a $6 million increase in corporate overhead expenses, partially offset by small decreases in several other categories of noninterest expenses. See the Business Bank discussion, above, for an explanation of the increase in corporate overhead expense.

Net income in Other Markets of $174 million for the nine months ended September 30, 2014 increased $13 million from the nine months ended September 30, 2013. Net interest income (FTE) of $231 million for the nine months ended September 30, 2014 decreased $8 million from the comparable period in the prior year, primarily due to the impact of a decrease in average loans of $296 million and lower loan yields, partially offset by an increase in net FTP credits. Average deposits increased $326 million. The provision for credit losses decreased $31 million in the nine months ended September 30, 2014, compared to the same period in the prior year. Net credit-related recoveries were $18 million for the nine months ended September 30, 2014 compared to net charge-offs of $13 million for the comparable period in the prior year, primarily reflecting decreases in general Middle Market, Commercial Real Estate and Environmental Services. Noninterest income of $121 million for the nine months ended September 30, 2014 decreased $8 million from the comparable period in the prior year, primarily reflecting a $7 million decrease in income from the Corporation's third-party credit card provider, largely due to a change in the timing of the recognition of incentives from annually to quarterly in the third quarter of 2013, and small decreases in several noninterest income categories. Noninterest expenses of $144 million for the nine months ended September 30, 2014 decreased $4 million compared to the same period in the prior year, primarily due to a $4 million decrease in salaries and benefits expense and smaller decreases in several other noninterest expense categories, partially offset by a $2 million increase in corporate overhead expenses. See the Business Banking discussion, above, for an explanation of the increase in corporate overhead expense.

The net loss for the Finance & Other category of $257 million in the nine months ended September 30, 2014 decreased $25 million compared to the nine months ended September 30, 2013, primarily reflecting a $27 million decrease in net loss in the Finance segment, largely due to the third quarter 2014 gain of $32 million on the early redemption of debt as previously discussed under the "Business Segments" subheading above.

47

The following table lists the Corporation's banking centers by geographic market segment.

	September 30,
	2014	2013
Michigan	214	215
Texas	135	136
California	104	105
Other Markets:
Arizona	18	18
Florida	9	9
Canada	1	1
Total	481	484

48

FINANCIAL CONDITION

Total assets were $68.9 billion at September 30, 2014, an increase of $3.7 billion from $65.2 billion at December 31, 2013, primarily reflecting increases of $2.2 billion in total loans and $1.4 billion in interest-bearing deposits with banks. On an average basis, total assets increased $1.8 billion to $66.4 billion in the third quarter 2014, compared to $64.6 billion in the fourth quarter 2013, resulting primarily from an increase of $3.1 billion in average loans, partially offset by a decrease of $1.4 billion in average interest-bearing deposits with banks.

The following tables provide information about the change in the Corporation's average loan portfolio in the third quarter 2014, compared to the fourth quarter 2013.

	Three Months Ended							Percent Change
(dollar amounts in millions)	September 30, 2014		December 31, 2013		Change
Average Loans:
Commercial loans by business line:
General Middle Market	$	10,354	$	9,954	$	400		4	%
National Dealer Services	3,919		3,777		142			4
Energy	3,268		2,725		543			20
Technology and Life Sciences	2,467		1,988		479			24
Environmental Services	884		791		93			12
Entertainment	552		617		(65		)	(11	)
Total Middle Market	21,444		19,852		1,592			8
Corporate Banking	3,370		3,130		240			8
Mortgage Banker Finance	1,595		1,109		486			44
Commercial Real Estate	805		760		45			6
Total Business Bank commercial loans	27,214		24,851		2,363			10
Total Retail Bank commercial loans	1,592		1,431		161			11
Total Wealth Management commercial loans	1,382		1,401		(19		)	(1	)
Total commercial loans	30,188		27,683		2,505			10
Real estate construction loans	1,973		1,652		321			19
Commercial mortgage loans	8,698		8,714		(16		)	—
Lease financing	823		838		(15		)	(2	)
International loans	1,417		1,303		114			9
Residential mortgage loans	1,792		1,679		113			7
Consumer loans	2,268		2,185		83			4
Total loans	$	47,159	$	44,054	$	3,105		7	%
Average Loans By Geographic Market:
Michigan	$	13,248	$	13,323	$	(75	)	(1	)%
California	15,509		14,431		1,078			7
Texas	11,147		9,766		1,381			14
Other Markets	7,255		6,534		721			11
Total loans	$	47,159	$	44,054	$	3,105		7	%

Average loans for the three months ended September 30, 2014 increased $3.1 billion, compared to the three months ended December 31, 2013, led by increases of $2.5 billion, or 10 percent in average commercial loans and $305 million, or 3 percent in average combined commercial mortgage and real estate construction loans. The $2.5 billion increase in average commercial loans primarily reflected an increase in Middle Market ($1.6 billion), Mortgage Banker Finance ($486 million) and Corporate Banking ($240 million). The increase in Middle Market primarily reflected increases in Energy ($543 million), Technology and Life Sciences ($479 million) and general Middle Market ($400 million). In general, Middle Market serves customers with annual revenue between $20 million and $500 million; while Corporate serves customers with revenue over $500 million. Changes in average total loans by geographic market is provided in the table above.

Investment securities available-for-sale increased $161 million to $9.5 billion at September 30, 2014, from $9.3 billion at December 31, 2013, primarily reflecting purchases slightly out-pacing paydowns on residential mortgage-backed investment securities (RMBS) as well as an $84 million decrease in net unrealized losses, to a net unrealized loss of $23 million at September 30, 2014, compared to a net unrealized loss of $107 million at December 31, 2013. On an average basis, investment securities available-for-sale increased $23 million in the third quarter 2014, compared to the fourth quarter 2013.

49

The Corporation has been purchasing Government National Mortgage Association (GNMA) RMBS to replace paydowns on RMBS issued by government-sponsored enterprises, as GNMA securities receive more favorable treatment under the liquidity rules recently issued by U.S. banking regulators. Further information about the rule is provided later in this section under the "Capital" subheading. The following table provides a summary of the composition of the Corporation's RMBS portfolio.

	September 30, 2014				December 31, 2013
(dollar amounts in millions)	Amount		Percent of Total		Amount		Percent of Total
RMBS issued by GNMA	$	1,755	19	%	$	672	8	%
RMBS issued by government-sponsored enterprises	7,354		81		8,254		92
Total RMBS	$	9,109	100	%	$	8,926	100	%

Total liabilities increased $3.4 billion to $61.5 billion at September 30, 2014, compared to $58.1 billion at December 31, 2013, primarily reflecting an increase of $4.3 billion in total deposits, partially offset by a decrease of $874 million in medium- and long-term debt. On an average basis, total liabilities increased $1.4 billion in the third quarter 2014, compared to the fourth quarter 2013, primarily due to increases of $1.7 billion in noninterest-bearing deposits and $651 million in interest-bearing deposits, partially offset by a decrease of $911 million in medium- and long-term debt. The decrease in average medium- and long-term debt resulted primarily from the maturities of $1 billion of floating-rate FHLB advances and $250 million of subordinated notes, as well as the early redemption of $150 million of subordinated notes, partially offset by issuances of $350 million of medium-term senior notes and $250 million of subordinated notes, during the second and third quarters of 2014. The increase in average total deposits of $2.4 billion primarily reflected increases in general Middle Market ($1.4 billion), Technology and Life Sciences ($701 million), Retail Banking ($305 million) and Private Banking ($248 million), partially offset by a decrease in Corporate Banking ($123 million). Average total deposits increased in all geographic markets.

Capital

Total shareholders' equity increased $283 million to $7.4 billion at September 30, 2014, compared to December 31, 2013. The following table presents a summary of changes in total shareholders' equity in the nine months ended September 30, 2014.

(in millions)
Balance at January 1, 2014			$	7,150
Net income			444
Cash dividends declared on common stock			(107		)
Purchase of common stock			(200		)
Other comprehensive income:
Investment securities available-for-sale	$	54
Defined benefit and other postretirement plans	20
Total other comprehensive income			74
Issuance of common stock under employee stock plans			41
Share-based compensation			31
Balance at September 30, 2014			$	7,433

The Corporation periodically conducts stress tests to evaluate potential impacts to the Corporation's forecasted financial condition under various economic scenarios. These stress tests are a regular part of the Corporation's overall risk management and capital planning process. The same forecasting process is also used by the Corporation to conduct the stress test that was part of the Federal Reserve's Comprehensive Capital Analysis and Review (CCAR). For additional information about risk management processes, refer to the "Risk Management" section of this financial review.

The Federal Reserve completed its 2014 CCAR review in March 2014 and did not object to the Corporation's capital plan and capital distributions contemplated in the plan. The plan provides for up to $236 million in share repurchases for the four-quarter period ending March 31, 2015. At September 30, 2014, up to $118 million remained available for share repurchases under the plan. The plan also provided the authority to fully redeem $150 million par value of 8.375% subordinated notes due 2024. The notes were called at par on July 15, 2014, resulting in a gain of approximately $32 million.

On April 22, 2014, the Board of Directors of the Corporation (the Board) approved a 1-cent increase in the quarterly dividend to $0.20 per common share. The Board also authorized the repurchase of up to an additional 2.0 million shares of Comerica Incorporated outstanding common stock, in addition to the 5.1 million shares remaining at March 31, 2014 under the Board's prior authorizations for the share repurchase program initially approved in November 2010. Including the April 22, 2014 authorization, a total of 30.3 million shares has been authorized for repurchase under the share repurchase program since its inception in 2010. In November 2010, the Board authorized the purchase of up to all 11.5 million of the Corporation's original outstanding warrants. There is no expiration date for the Corporation's share repurchase program.

50

The following table summarizes the Corporation's repurchase activity during the nine months ended September 30, 2014.

(shares in thousands)	Total Number of Shares and Warrants Purchased as  Part of Publicly Announced Repurchase Plans or Programs	Remaining Repurchase Authorization (a)		Total Number of Shares Purchased (b)	Average Price Paid Per  Share		Average Price Paid Per  Warrant (c)
Total first quarter 2014	1,523	16,591		1,703	$	47.21	$	—
Total second quarter 2014	1,236	16,697	(d)	1,273	$	47.73	—
July 2014	502	16,145		505	50.14		—
August 2014	566	15,579		566	49.42		—
September 2014	115	15,334		115	50.48		—
Total third quarter 2014	1,183	15,334		1,186	49.83		—
Total 2014	3,942	15,334		4,162	$	48.11	$	—

(a) Maximum number of shares and warrants that may yet be purchased under the publicly announced plans or programs.

(b) Includes approximately 220,000 shares purchased pursuant to deferred compensation plans and shares purchased from employees to pay for taxes related to restricted stock vesting under the terms of an employee share-based compensation plan during the nine months ended September 30, 2014. These transactions are not considered part of the Corporation's repurchase program.

(c) The Corporation made no repurchases of warrants under the repurchase program during the nine months ended September 30, 2014. Upon exercise of a warrant, the number of shares with a value equal to the aggregate exercise price is withheld from an exercising warrant holder as payment (known as a "net exercise provision"). During the nine months ended September 30, 2014, the Corporation withheld the equivalent of approximately 492,000 shares to cover an aggregate of $14.4 million in exercise price and issued approximately 361,000 shares to the exercising warrant holders. Shares withheld in connection with the net exercise provision are not included in the total number of shares or warrants purchased in the above table.

(d) Includes April 22, 2014 share repurchase authorization for up to an additional 2.0 million shares.

Risk-based regulatory capital standards are designed to make regulatory capital requirements more sensitive to differences in credit risk profiles among banking institutions and to account for off-balance sheet exposure. Assets and off-balance sheet items are assigned to broad risk categories, each with specified risk-weighting factors. The resulting capital ratios represent capital as a percentage of total risk-weighted assets and off-balance sheet items.

The Corporation's capital ratios exceeded minimum regulatory requirements as follows:

	September 30, 2014				December 31, 2013
(dollar amounts in millions)	Capital		Ratio		Capital		Ratio
Tier 1 common (a) (b)	$	7,105	10.69	%	$	6,895	10.64	%
Tier 1 risk-based (4.00% - minimum) (b)	7,105		10.69		6,895		10.64
Total risk-based (8.00% - minimum) (b)	8,608		12.95		8,491		13.10
Leverage (3.00% - minimum) (b)	7,105		10.80		6,895		10.77
Tangible common equity (a)	6,783		9.94		6,498		10.07

(a) See Supplemental Financial Data section for reconcilements of non-GAAP financial measures.

(b) September 30, 2014 capital and ratios are estimated.

In July 2013, U.S. banking regulators issued a final rule for the U.S. adoption of the Basel III regulatory capital framework. The regulatory framework includes a more conservative definition of capital, two new capital buffers - a conservation buffer and a countercyclical buffer, new and more stringent risk weight categories for assets and off-balance sheet items, and a supplemental leverage ratio. As a banking organization subject to the standardized approach, the rules will be effective for the Corporation on January 1, 2015, with certain transition provisions fully phased in on January 1, 2018.

According to the rule, the Corporation will be subject to the capital conservation buffer of 2.5 percent, when fully phased in, to avoid restrictions on capital distributions and discretionary bonuses. However, the rules do not subject the Corporation to the capital countercyclical buffer of up to 2.5 percent or the supplemental leverage ratio. The Corporation estimates the September 30, 2014 common equity Tier 1 and Tier 1 risk-based ratio would be 10.4 percent if calculated under the final rule, excluding most elements of accumulated other comprehensive income from regulatory capital. The Corporation's September 30, 2014 estimated common equity Tier 1 and Tier 1 capital ratios exceed the minimum required by the final rule (7 percent and 8.5 percent, respectively, including the fully phased-in capital conservation buffer). For a reconcilement of these non-GAAP financial measures, refer to the "Supplemental Financial Data" section of this financial review.

The Corporation expects that U.S. banking regulators will establish an additional capital buffer for banking organizations deemed systemically important to the U.S. financial system (Domestic Systemically Important Banks, or "D-SIB"). If designated as a D-SIB by the U.S. banking regulators, the Corporation would be subject to the additional buffer. While the level and timing of a D-SIB buffer is not currently known, the Corporation expects to exceed all required capital levels within regulatory timelines.

51

In September 2014, U.S. banking regulators issued a final rule implementing a quantitative liquidity requirement in the U.S. generally consistent with the Liquidity Coverage Ratio (LCR) minimum liquidity measure established under the Basel III liquidity framework. Under the rule, the Corporation is subject to a modified LCR standard, which requires a financial institution to hold a minimum level of high-quality, liquid assets (HQLA) to fully cover modified net cash outflows under a 30-day systematic liquidity stress scenario. The rule is effective for the Corporation on January 1, 2016. During the transition year, 2016, the Corporation will be required to maintain a minimum LCR of 90 percent. Beginning January 1, 2017, and thereafter, the minimum required LCR will be 100 percent. The Corporation continues to evaluate the impact of the rule; however, we expect to meet the final requirements adopted by U.S. banking regulators within the required timetable. To reach full compliance and provide a buffer for normal volatility in balance sheet dynamics, the Corporation expects to add additional HQLA, funded with additional debt, in the future. The Corporation does not expect compliance with the LCR rule will have a significant impact on net interest income.

The Basel III liquidity framework includes a second minimum liquidity measure, the Net Stable Funding Ratio (NSFR), which requires the amount of available longer-term, stable sources of funding to be at least 100 percent of the required amount of longer-term stable funding over a one-year period. The Basel Committee on Banking Supervision is in the process of reviewing the proposed NSFR standard and evaluating its impact on the banking system. U.S. banking regulators have announced that they expect to issue proposed rulemaking to implement the NSFR in advance of its scheduled global implementation in 2018. While uncertainty exists in the final form and timing of the U.S. rule implementing the NSFR and whether or not the Corporation will be subject to the full requirements, the Corporation is closely monitoring the development of the rule.

RISK MANAGEMENT

The following updated information should be read in conjunction with the "Risk Management" section on pages F-23 through F-40 in the Corporation's 2013 Annual Report.

Credit Risk

Allowance for Credit Losses

The allowance for credit losses includes both the allowance for loan losses and the allowance for credit losses on lending-related commitments. The allowance for loan losses represents management's assessment of probable, estimable losses inherent in the Corporation's loan portfolio. The allowance for credit losses on lending-related commitments, included in "accrued expenses and other liabilities" on the consolidated balance sheets, provides for probable losses inherent in lending-related commitments, including unused commitments to extend credit and standby letters of credit.

The Corporation disaggregates the loan portfolio into segments for purposes of determining the allowance for credit losses. These segments are based on the level at which the Corporation develops, documents and applies a systematic methodology to determine the allowance for credit losses. The Corporation's portfolio segments are business loans and retail loans. Business loans are defined as those belonging to the commercial, real estate construction, commercial mortgage, lease financing and international loan portfolios. Retail loans consist of traditional residential mortgage, home equity and other consumer loans. The allowance for loan losses includes specific allowances, based on individual evaluations of certain loans, and allowances for homogeneous pools of loans with similar risk characteristics.

The Corporation regularly reviews and refines its methodology for determining the allowance for credit losses. In the second quarter 2014, the approach used to determine standard reserve factors was enhanced, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the business segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each business segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly.

The U.S. economy rebounded from a first quarter 2014 in which real Gross Domestic Product declined at a 2.9% annual rate. The second quarter 2014 saw real GDP growth of 4.6% and third quarter growth was about 2.1%. Unemployment claims have fallen in recent reporting periods while housing related metrics have started to moderate. While the U.S economy continues to show moderate growth overall, European and Asian economies appear to be slowing, with heightened risk of Europe falling into recession. Improvement in overall credit portfolio metrics has abated, as the Corporation believes it has reached near cycle-low levels of criticized loans and loan charge-offs. This is balanced by continued loan growth at the Corporation and industry-wide. While the overall credit quality of the loan portfolio remained strong in the third quarter of 2014, economic complexity and uncertainty continued to be a consideration when determining the appropriateness of the allowance for loan losses.

The allowance for loan losses was $592 million at September 30, 2014, compared to $598 million at December 31, 2013, a decrease of $6 million, or 1 percent. The decrease resulted primarily from improved credit quality in the loan portfolio, partially offset by higher loan balances.

52

The total allowance for loan losses is sufficient to absorb incurred losses inherent in the total loan portfolio. Unanticipated economic events, including political, economic and regulatory instability could cause changes in the credit characteristics of the portfolio and result in a currently unanticipated increase in the allowance. Loss emergence periods, which are used to determine the most appropriate default horizon associated with the calculation of probabilities of default, tend to lengthen during benign economic periods and shorten during periods of economic distress. Considered in isolation, lengthening the loss emergence period assumption would result in an increase to the allowance for loan losses. In addition, inclusion of other industry-specific portfolio exposures in the allowance, as well as significant increases in the current portfolio exposures, could also increase the amount of the allowance. Any of these events, or some combination thereof, may result in a future need for additional provision for loan losses in order to maintain an allowance that complies with credit risk and accounting policies.

The allowance for credit losses on lending-related commitments includes specific allowances, based on individual evaluations of certain letters of credit in a manner consistent with business loans, and allowances based on the pool of the remaining letters of credit and all unused commitments to extend credit within each internal risk rating.

The allowance for credit losses on lending-related commitments was $43 million at September 30, 2014 compared to $36 million at December 31, 2013. The $7 million increase in the allowance for credit losses on lending-related commitments resulted primarily from an increase of $7 million in reserves for standby letters of credit, primarily as a result of an increase in criticized standby letters of credit.

Nonperforming Assets

Nonperforming assets include loans on nonaccrual status, troubled debt restructured loans (TDRs) which have been renegotiated to less than the original contractual rates (reduced-rate loans) and foreclosed property. TDRs include performing and nonperforming loans. Nonperforming TDRs are either on nonaccrual or reduced-rate status. Nonperforming assets do not include purchased credit impaired (PCI) loans.

The following table presents a summary of nonperforming assets and past due loans.

(dollar amounts in millions)	September 30, 2014			December 31, 2013
Nonaccrual loans:
Business loans:
Commercial	$	93		$	81
Real estate construction	18			21
Commercial mortgage	144			156
International	—			4
Total nonaccrual business loans	255			262
Retail loans:
Residential mortgage	42			53
Consumer:
Home equity	31			33
Other consumer	1			2
Total consumer	32			35
Total nonaccrual retail loans	74			88
Total nonaccrual loans	329			350
Reduced-rate loans	17			24
Total nonperforming loans	346			374
Foreclosed property	11			9
Total nonperforming assets	$	357		$	383
Nonperforming loans as a percentage of total loans	0.73		%	0.82		%
Nonperforming assets as a percentage of total loans and foreclosed property	0.75			0.84
Allowance for loan losses as a percentage of total nonperforming loans	171			160
Loans past due 90 days or more and still accruing	$	13		$	16
Loans past due 90 days or more and still accruing as a percentage of total loans	0.03		%	0.03		%

Nonperforming assets decreased $26 million to $357 million at September 30, 2014, from $383 million at December 31, 2013. The decrease in nonperforming assets reflected decreases in almost all categories, with the exception of increases in commercial loans ($12 million) and foreclosed property ($2 million). Nonperforming assets as a percentage of total loans and foreclosed property was 0.75 percent at September 30, 2014, compared to 0.84 percent at December 31, 2013.

53

The following table presents a summary of changes in nonaccrual loans.

	Three Months Ended
(in millions)	September 30, 2014			June 30, 2014			December 31, 2013
Balance at beginning of period	$	326		$	317		$	437
Loans transferred to nonaccrual (a)	54			53			23
Nonaccrual business loan gross charge-offs (b)	(20		)	(24		)	(33		)
Nonaccrual business loans sold (c)	(3		)	(6		)	(14		)
Payments/other (d)	(28		)	(14		)	(63		)
Balance at end of period	$	329		$	326		$	350
(a) Based on an analysis of nonaccrual loans with book balances greater than $2 million.
(b) Analysis of gross loan charge-offs:
Nonaccrual business loans	$	20		$	24		$	33
Performing criticized loans	—			—			3
Retail loans	4			4			5
Total gross loan charge-offs	$	24		$	28		$	41
(c) Analysis of loans sold:
Nonaccrual business loans	$	3		$	6		$	14
Performing criticized loans	—			8			22
Total criticized loans sold	$	3		$	14		$	36
(d) Includes net changes related to nonaccrual loans with balances less than $2 million, payments on nonaccrual loans with book balances greater than $2 million, transfers of nonaccrual loans to foreclosed property and retail loan gross charge-offs. Excludes business loan gross charge-offs and nonaccrual business loans sold.

There were four borrowers with balances greater than $2 million, totaling $54 million, transferred to nonaccrual status in the third quarter 2014, an increase of $1 million when compared to $53 million in the second quarter 2014. The transfers to nonaccrual greater than $2 million in the third quarter 2014, included two borrowers from Technology and Life Sciences and one each from general Middle Market and Private Banking.

The following table presents the composition of nonaccrual loans by balance and the related number of borrowers at September 30, 2014 and December 31, 2013.

	September 30, 2014			December 31, 2013
(dollar amounts in millions)	Number of Borrowers	Balance		Number of Borrowers	Balance
Under $2 million	1,549	$	173	1,756	$	211
$2 million - $5 million	15	46		23	71
$5 million - $10 million	4	32		3	23
$10 million - $25 million	4	51		3	45
Greater than $25 million	1	27		—	—
Total	1,573	$	329	1,785	$	350

54

The following table presents a summary of nonaccrual loans at September 30, 2014 and loans transferred to nonaccrual and net loan charge-offs for the three months ended September 30, 2014, based primarily on North American Industry Classification System (NAICS) categories.

	September 30, 2014				Three Months Ended September 30, 2014
(dollar amounts in millions)	Nonaccrual Loans				Loans Transferred to Nonaccrual (a)				Net Loan Charge-Offs (Recoveries)
Industry Category
Real Estate	$	89	27	%	$	12	22	%	$	(4	)	(125	)%
Services	42		13		—		—		1			22
Residential Mortgage	41		12		—		—		—			—
Contractors	30		9		27		50		—			—
Retail	21		6		15		28		7			224
Holding and Other Investment Companies	18		6		—		—		(2		)	(57	)
Transportation and Warehousing	16		5		—		—		2			61
Hotels	9		3		—		—		—			—
Health Care and Social Assistance	6		2		—		—		—			—
Natural Resources	6		2		—		—		(1		)	(20	)
Restaurants and Food Service	5		2		—		—		—			—
Manufacturing	5		1		—		—		(2		)	(74	)
Wholesale Trade	5		1		—		—		1			15
Other (b)	36		11		—		—		1			54
Total	$	329	100	%	$	54	100	%	$	3		100	%

(a) Based on an analysis of nonaccrual loans with book balances greater than $2 million.

(b) Consumer, excluding residential mortgage and certain personal purpose nonaccrual loans and net charge-offs, are included in the “Other” category.

The following table presents a summary of TDRs at September 30, 2014 and December 31, 2013.

(in millions)	September 30, 2014		December 31, 2013
Nonperforming TDRs:
Nonaccrual TDRs	$	77	$	100
Reduced-rate TDRs	17		24
Total nonperforming TDRs	94		124
Performing TDRs (a)	32		57
Total TDRs	$	126	$	181

(a) TDRs that do not include a reduction in the original contractual interest rate which are performing in accordance with their modified terms.

Performing TDRs primarily included $23 million in Small Business Banking, $7 million in Middle Market, and $1 million each in Corporate Banking and in Private Banking at September 30, 2014.

Loans past due 90 days or more and still accruing interest generally represent loans that are well collateralized and in a continuing process of collection. Loans past due 90 days or more and still accruing interest decreased$3 million to $13 million at September 30, 2014, compared to $16 million at December 31, 2013. Loans past due 30-89 days increased$1 million to $128 million at September 30, 2014, compared to $127 million at December 31, 2013.

The following table presents a summary of total criticized loans. Criticized loans with balances of $2 million or more on nonaccrual status or whose terms have been modified in a TDR are individually subjected to quarterly credit quality reviews, and the Corporation may establish specific allowances for such loans.

(dollar amounts in millions)	September 30, 2014			June 30, 2014			December 31, 2013
Total criticized loans	$	2,094		$	2,188		$	2,260
As a percentage of total loans	4.6		%	4.6		%	5.0		%

The following table presents a summary of foreclosed property by property type.

(in millions)	September 30, 2014		June 30, 2014		December 31, 2013
Single family residential properties	$	9	$	9	$	5
Construction, land development and other land	—		—		2
Other non-land, nonresidential properties	2		4		2
Total foreclosed property	$	11	$	13	$	9

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At September 30, 2014, foreclosed property totaled $11 million and consisted of approximately 91 properties, compared to $9 million and approximately 89 properties at December 31, 2013.

The following table presents a summary of changes in foreclosed property.

	Three Months Ended
(in millions)	September 30, 2014			June 30, 2014			December 31, 2013
Balance at beginning of period	$	13		$	14		$	19
Acquired in foreclosure	2			4			4
Write-downs	—			(1		)	(1		)
Foreclosed property sold (a)	(4		)	(4		)	(13		)
Balance at end of period	$	11		$	13		$	9
(a) Net gain on foreclosed property sold	$	1		$	2		$	2

Commercial and Residential Real Estate Lending

The following table summarizes the Corporation's commercial real estate loan portfolio by loan category.

(in millions)	September 30, 2014		December 31, 2013
Real estate construction loans:
Commercial Real Estate business line (a)	$	1,683	$	1,447
Other business lines (b)	309		315
Total real estate construction loans	$	1,992	$	1,762
Commercial mortgage loans:
Commercial Real Estate business line (a)	$	1,743	$	1,678
Other business lines (b)	6,860		7,109
Total commercial mortgage loans	$	8,603	$	8,787

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

The Corporation limits risk inherent in its commercial real estate lending activities by limiting exposure to those borrowers directly involved in the commercial real estate markets and adhering to conservative policies on loan-to-value ratios for such loans. Commercial real estate loans, consisting of real estate construction and commercial mortgage loans, totaled $10.6 billion at September 30, 2014, of which $3.4 billion, or 32 percent, were to borrowers in the Commercial Real Estate business line, which includes loans to real estate developers. The remaining $7.2 billion, or 68 percent, of commercial real estate loans in other business lines consisted primarily of owner-occupied commercial mortgages, which bear credit characteristics similar to non-commercial real estate business loans.

The real estate construction loan portfolio primarily contains loans made to long-time customers with satisfactory completion experience. Real estate construction loans in the Commercial Real Estate business line totaled $1.7 billion with $17 million on nonaccrual status at September 30, 2014, compared to $1.4 billion with $20 million on nonaccrual status at December 31, 2013. In other business lines, $1 million of real estate construction loans were on nonaccrual status at both September 30, 2014 and December 31, 2013.

Loans in the commercial mortgage portfolio generally mature within three to five years. Of the $1.7 billion of commercial mortgage loans in the Commercial Real Estate business line outstanding at both September 30, 2014 and December 31, 2013, $49 million and $51 million were on nonaccrual status at September 30, 2014 and December 31, 2013, respectively. Commercial mortgage loan net recoveries in the Commercial Real Estate business line were $2 million for the nine months ended September 30, 2014, compared to net charge-offs of $7 million for the nine months ended September 30, 2013. In other business lines, $95 million and $105 million of commercial mortgage loans were on nonaccrual status at September 30, 2014 and December 31, 2013, respectively. Net charge-offs were $4 million and $9 million for the nine-month periods ended September 30, 2014 and 2013, respectively.

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The geographic distribution and project type of commercial real estate loans are important factors in diversifying credit risk within the portfolio. The following table reflects real estate construction and commercial mortgage loans to borrowers in the Commercial Real Estate business line by project type and location of property.

	September 30, 2014
	Location of Property												December 31, 2013
(dollar amounts in millions) Project Type:	California		Michigan		Texas		Other		Total		% of Total		Total		% of Total
Real estate construction loans:
Commercial Real Estate business line:
Residential	185		20		53		10		268		17		228		16
Multi-family	499		1		466		81		1,047		62		830		57
Office	84		—		32		4		120		7		162		11
Retail	41		8		35		18		102		6		102		7
Commercial	6		—		60		2		68		4		46		3
Other	3		37		14		24		78		4		79		6
Total	$	818	$	66	$	660	$	139	$	1,683	100	%	$	1,447	100	%
Commercial mortgage loans:
Commercial Real Estate business line:
Residential	61		12		23		27		123		7		136		8
Multi-family	264		33		72		61		430		25		378		22
Retail	110		87		101		64		362		21		337		20
Office	162		14		45		12		233		13		235		14
Commercial	105		33		24		25		187		11		178		11
Other	260		15		45		88		408		23		414		25
Total	$	962	$	194	$	310	$	277	$	1,743	100	%	$	1,678	100	%

The following table summarizes the Corporation's residential mortgage and home equity loan portfolios by geographic market.

	September 30, 2014								December 31, 2013
(dollar amounts in millions)	Residential Mortgage  Loans		% of Total		Home Equity  Loans		% of Total		Residential Mortgage  Loans		% of Total		Home Equity  Loans		% of Total
Geographic market:
Michigan	$	416	23	%	$	805	49	%	$	422	25	%	$	808	53	%
California	805		45		536		33		705		41		436		29
Texas	339		19		243		15		340		20		228		15
Other Markets	237		13		50		3		230		14		45		3
Total	$	1,797	100	%	$	1,634	100	%	$	1,697	100	%	$	1,517	100	%

Residential real estate loans consist of traditional residential mortgages and home equity loans and lines of credit. Residential mortgages totaled $1.8 billion at September 30, 2014, and were primarily larger, variable-rate mortgages originated and retained for certain private banking relationship customers. Of the $1.8 billion of residential mortgage loans outstanding, $42 million were on nonaccrual status at September 30, 2014. The home equity portfolio totaled $1.6 billion at September 30, 2014, of which $1.5 billion was outstanding under primarily variable-rate, interest-only home equity lines of credit and $83 million were closed-end home equity loans. Of the $1.6 billion of home equity loans outstanding, $31 million were on nonaccrual status at September 30, 2014. A majority of the home equity portfolio was secured by junior liens at September 30, 2014. The residential real estate portfolio is principally located within the Corporation's primary geographic markets. Substantially all residential real estate loans past due 90 days or more are placed on nonaccrual status. Even if current or less than 90 days past due, substantially all junior lien home equity loans are placed on nonaccrual status if full collection of the senior position is in doubt. Such loans are charged off to current appraised values less costs to sell no later than 180 days past due.

Shared National Credits

Shared National Credits (SNCs) are defined by banking regulators as facilities of more than $20 million shared by three or more federally supervised financial institutions that are selectively reviewed on an annual basis by regulatory authorities at the agent bank level. The Corporation generally seeks to obtain ancillary business at the origination of a SNC relationship. Loans classified as SNC loans totaled $10.4 billion at September 30, 2014 (approximately 865 borrowers), compared to $9.4 billion (approximately 860 borrowers) at December 31, 2013. SNC loans are held to the same credit underwriting and pricing standards as the remainder of the loan portfolio. The Bank was the agent for $1.9 billion and $1.5 billion of the SNC loans outstanding at

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September 30, 2014 and December 31, 2013, respectively. Nonaccrual SNC loans increased $5 million to $16 million at September 30, 2014, compared to $11 million at December 31, 2013. SNC net loan charge-offs totaled $2 million for both the three- and nine-month periods ended September 30, 2014, respectively, compared to zero and $8 million for the three- and nine-month periods ended September 30, 2013, respectively.

Energy Lending

The Corporation has a portfolio of energy-related loans that are included primarily in "commercial loans" in the consolidated balance sheets. The Corporation has over 30 years of experience in energy lending, with a focus on middle market companies. Loans in the Middle Market - Energy business line were $3.4 billion, or approximately 7 percent of total loans, at September 30, 2014, compared to $2.8 billion, or approximately 6 percent of total loans, at December 31, 2013. Nonaccrual Middle Market - Energy loans were zero at September 30, 2014, compared to $1 million at December 31, 2013. There were no Middle Market - Energy net loan charge-offs for both the three- and nine-month periods ended September 30, 2014, compared to net loan charge-offs of zero and $2 million for the three- and nine-month periods ended September 30, 2013, respectively. Energy loans are diverse in nature, with outstanding balances by customer market segment distributed approximately as follows at September 30, 2014: 70 percent exploration and production (EP) (comprised of approximately 59 percent oil, 23 percent mixed and 18 percent natural gas), 17 percent energy services and 13 percent midstream. Approximately 95 percent of the outstanding loans in the EP and midstream market segments were secured at September 30, 2014.

State and Local Municipalities

In the normal course of business, the Corporation serves the needs of state and local municipalities in multiple capacities, including traditional banking products such as deposit services, loans and letters of credit, investment banking services such as bond underwriting and private placements, and by investing in municipal securities.

The following table summarizes the Corporation's direct exposure to state and local municipalities as of September 30, 2014 and December 31, 2013.

(in millions)	September 30, 2014		December 31, 2013
Loans outstanding	$	35	$	39
Lease financing	309		330
Investment securities available-for-sale	23		22
Trading account securities	1		3
Standby letters of credit	96		97
Unused commitments to extend credit	19		20
Total direct exposure to state and local municipalities	$	483	$	511

Indirect exposure comprised $98 million in auction-rate preferred securities collateralized by municipal securities at September 30, 2014, compared to $109 million at December 31, 2013. Additionally, the Corporation is exposed to Automated Clearing House (ACH) transaction risk for those municipalities utilizing this electronic payment and/or deposit method and similar products in their cash flow management. The Corporation sets limits on ACH activity during the underwriting process.

Extensions of credit to state and local municipalities are subjected to the same underwriting standards as other business loans. At both September 30, 2014 and December 31, 2013, all outstanding municipal loans and leases were performing according to contractual terms, and one municipal lease was included in the Corporation's criticized loan list. Municipal leases are secured by the underlying equipment, and a substantial majority of the leases are fully defeased with AAA-rated U.S. government securities. Substantially all municipal investment securities available-for sale are auction-rate securities. All auction-rate securities are reviewed quarterly for other-than-temporary impairment. All auction-rate municipal securities were rated investment grade, and all auction-rate preferred securities collateralized by municipal securities were rated investment grade and were adequately collateralized at both September 30, 2014 and December 31, 2013. Municipal securities are held in the trading account for resale to customers. In addition, Comerica Securities, a broker-dealer subsidiary of the Bank, underwrites bonds issued by municipalities. All bonds underwritten by Comerica Securities are sold to third party investors.

On July 18, 2013, the city of Detroit filed for Chapter 9 bankruptcy protection in federal court. The Corporation's direct exposure to the city of Detroit is insignificant.

Automotive Lending

Substantially all dealer loans are in the National Dealer Services business line. Loans in the National Dealer Services business line include floor plan financing and other loans to automotive dealerships. Floor plan loans, included in “commercial loans” in the consolidated balance sheets, totaled $3.2 billion at September 30, 2014, a decrease of $321 million compared to $3.5 billion at December 31, 2013. At September 30, 2014, other loans to automotive dealers in the National Dealer Services business line totaled $2.3 billion, including $1.5 billion of owner-occupied commercial real estate mortgage loans, compared to $2.1 billion of other loans to automotive dealers in the National Dealer Service line, including $1.4 billion of owner-occupied commercial real

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estate mortgage loans, at December 31, 2013. Automotive lending also includes loans to borrowers involved with automotive production, primarily Tier 1 and Tier 2 suppliers. Loans to borrowers involved with automotive production totaled approximately $1.2 billion at both September 30, 2014 and December 31, 2013.

International Exposure

International assets are subject to general risks inherent in the conduct of business in foreign countries, including economic uncertainties and each foreign government's regulations. Risk management practices minimize the risk inherent in international lending arrangements. These practices include structuring bilateral agreements or participating in bank facilities, which secure repayment from sources external to the borrower's country. Accordingly, such international outstandings are excluded from the cross-border risk of that country.

The Corporation does not hold any sovereign exposure to Europe. The Corporation's international strategy as it pertains to Europe is to focus on European companies doing business in North America, with an emphasis on the Corporation's primary geographic markets. The following table summarizes cross-border exposure to entities domiciled in European countries.

	September 30, 2014						December 31, 2013
(in millions)	Outstanding (a)		Unfunded Commitments and Guarantees		Total Exposure		Outstanding (a)		Unfunded Commitments and Guarantees		Total Exposure
United Kingdom	$	71	$	208	$	279	$	99	$	242	$	341
Netherlands	55		39		94		61		89		150
Luxembourg	27		33		60		17		7		24
Germany	6		43		49		7		47		54
Switzerland	15		6		21		18		1		19
Sweden	1		18		19		4		15		19
Italy	10		5		15		5		2		7
Belgium	7		1		8		7		4		11
Other	1		1		2		3		1		4
Total Europe	$	193	$	354	$	547	$	221	$	408	$	629

(a) Includes funded loans, bankers acceptances and net counterparty derivative exposure.

For further discussion of credit risk, see the "Credit Risk" section of pages F-23 through F-35 in the Corporation's 2013 Annual Report.

Market and Liquidity Risk

Market risk represents the risk of loss due to adverse movements in market rates or prices, including interest rates, foreign exchange rates, and commodity and equity prices. Liquidity risk represents the failure to meet financial obligations coming due resulting from an inability to liquidate assets or obtain adequate funding, and the inability to easily unwind or offset specific exposures without significant changes in pricing, due to inadequate market depth or market disruptions.

The Asset and Liability Policy Committee (ALCO) of the Corporation establishes and monitors compliance with the policies and risk limits pertaining to market and liquidity risk management activities. ALCO meets regularly to discuss and review market and liquidity risk management strategies, and consists of executive and senior management from various areas of the Corporation, including treasury, finance, economics, lending, deposit gathering and risk management.

The Corporation's Market Risk Department in the Office of Enterprise Risk supports ALCO in measuring, monitoring and managing interest rate and liquidity risks and coordinating all other market risks. Key activities encompass: (i) providing information and analysis of the Corporation's balance sheet structure and measurement of interest rate, liquidity and all other market risks; (ii) monitoring and reporting of the Corporation's positions relative to established policy limits and guidelines; (iii) developing and presenting analyses and strategies to adjust risk positions; (iv) reviewing and presenting policies and authorizations for approval; (v) monitoring of industry trends and analytical tools to be used in the management of interest rate, liquidity and all other market risks; and (vi) developing and monitoring the interest rate risk economic capital estimate.

Interest Rate Risk

Net interest income is the primary source of revenue for the Corporation. Interest rate risk arises in the normal course of business due to differences in the repricing and cash flow characteristics of assets and liabilities, primarily through the Corporation's core business activities of extending loans and acquiring deposits. The Corporation's balance sheet is predominantly characterized by floating-rate loans funded by a combination of core deposits and wholesale borrowings. Approximately 85 percent of the Corporation's loans were floating at September 30, 2014, of which approximately 75 percent were based on LIBOR and 25 percent were based on Prime. This creates sensitivity to interest rate movements due to the imbalance between the floating-rate loan

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portfolio and the more slowly repricing deposit products. In addition, growth and/or contraction in the Corporation's loans and deposits may lead to changes in sensitivity to interest rate movements in the absence of mitigating actions. Examples of such actions are purchasing investment securities, primarily fixed-rate, which provide liquidity to the balance sheet and act to mitigate the inherent interest sensitivity, and hedging the sensitivity with interest rate swaps. The Corporation actively manages its exposure to interest rate risk, with the principal objective of optimizing net interest income and the economic value of equity while operating within acceptable limits established for interest rate risk and maintaining adequate levels of funding and liquidity.

Since no single measurement system satisfies all management objectives, a combination of techniques is used to manage interest rate risk. These techniques examine the impact of interest rate risk on net interest income and the economic value of equity under a variety of alternative scenarios, including changes in the level, slope and shape of the yield curve, utilizing multiple simulation analyses. Simulation analyses produce only estimates of net interest income, as the assumptions used are inherently uncertain. Actual results may differ from simulated results due to many factors, including, but not limited to, the timing, magnitude and frequency of changes in interest rates, market conditions, regulatory impacts and management strategies.

Sensitivity of Net Interest Income to Changes in Interest Rates

The analysis of the impact of changes in interest rates on net interest income under various interest rate scenarios is management's principal risk management technique. Management models a base case net interest income under an unchanged interest rate environment and what is believed to be the most likely balance sheet structure. Existing derivative instruments entered into for risk management purposes are included in the analysis, but no additional hedging is currently forecasted. These derivative instruments currently comprise interest rate swaps that convert fixed-rate long-term debt to variable rates. This base case net interest income is then compared against interest rate scenarios in which rates rise or decline in a linear, non-parallel fashion from the base case over 12 months. In the scenarios presented, short-term interest rates increase 200 basis points, resulting in an average increase in short-term interest rates of 100 basis points over the period (+200 scenario). Due to the current low level of interest rates, the analysis reflects a declining interest rate scenario of a 25 basis point drop in short-term interest rates, to zero percent.

Each scenario includes assumptions such as loan growth, investment security prepayment levels, depositor behavior, yield curve changes, loan and deposit pricing, and overall balance sheet mix and growth. In the +200 scenario, assumptions related to loan growth and deposit run-off are based on historical experience, resulting in a modest increase in loans and a modest decrease in deposits from the base case. No changes are modeled to investment securities beyond the replacement of prepayments, and expected funding maturities are included. As a result of the modeled balance sheet movement, excess reserves diminish. In addition, the model reflects deposit pricing based on historical price movements with short-term interest rates and loan spreads held at current levels. The analysis also does not capture possible regulatory impacts, including impacts of the recently finalized LCR requirements, which could impact balance sheet structure, product offerings and pricing as well as how interest rate risk is managed. How the Corporation chooses to make additional investments in HQLA and fund such investments may have an impact on sensitivity. Changes in economic activity may result in a balance sheet structure that is different from the changes management included in its simulation analysis and may translate into a materially different interest rate environment than those presented. For example, deposit balances have grown significantly over the past several years, creating uncertainty regarding future deposit balance levels. A decline in deposit balances beyond historical experience would reduce the estimated increase in net interest income in the +200 scenario.

The table below, as of September 30, 2014 and December 31, 2013, displays the estimated impact on net interest income during the next 12 months by relating the base case scenario results to those from the rising and declining rate scenarios described above.

	Estimated Annual Change
	September 30, 2014					December 31, 2013
(in millions)	Amount			%		Amount			%
Change in Interest Rates:
+200 basis points	$	227		14	%	$	210		13	%
-25 basis points (to zero percent)	(32		)	(2	)	(30		)	(2	)

Sensitivity increased slightly from December 31, 2013 to September 30, 2014 primarily due to changes in the current balance sheet mix driving a revised forecast. The risk to declining interest rates is limited as a result of the inability of the current low level of rates to fall significantly.

The table below, as of September 30, 2014, illustrates the estimated sensitivity of the above results to a change in deposit balance assumptions in the +200 scenario, with all other assumptions held constant. In this analysis, average noninterest-bearing deposit run-off in the 12-month period has been increased by $1 billion and $3 billion from the historical run-off experience included in the standard +200 scenario presented above and assumes the deposit run-off reduces excess reserves and increases purchased funds. The analysis is provided as an indicator of the sensitivity of net interest income to the modeled deposit run-off assumption. It is not meant to reflect management's expectation or best estimate. Actual run-off results may vary from those reflected.

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	+200 Basis Points
(in millions)	Estimated Annual Change
June 30, 2014	Amount		%
Incremental Average Decrease in Noninterest-bearing Deposit Balances:
$1 billion	$	216	13	%
$3 billion	194		12

Sensitivity of Economic Value of Equity to Changes in Interest Rates

In addition to the simulation analysis on net interest income, an economic value of equity analysis provides an alternative view of the interest rate risk position. The economic value of equity is the difference between the estimate of the economic value of the Corporation's financial assets, liabilities and off-balance sheet instruments, derived through discounting cash flows based on actual rates at the end of the period and the estimated economic value after applying the estimated impact of rate movements. The economic value of equity analysis is based on an immediate parallel 200 basis point increase and 25 basis point decrease in interest rates.

The table below, as of September 30, 2014 and December 31, 2013, displays the estimated impact on the economic value of equity from the interest rate scenario described above.

	September 30, 2014					December 31, 2013
(in millions)	Amount			%		Amount			%
Change in Interest Rates:
+200 basis points	$	940		8	%	$	670		6	%
-25 basis points (to zero percent)	(233		)	(2	)	(164		)	(1	)

The change in the sensitivity of the economic value of equity to a 200 basis point parallel increase in rates between December 31, 2013 and September 30, 2014 was primarily driven by changes in market interest rates at the middle to long end of the curve, which most significantly impact the value of deposits without a stated maturity, as well as growth in deposits without a stated maturity.

Wholesale Funding

The Corporation may access the purchased funds market when necessary, which includes foreign office time deposits and short-term borrowings. Capacity for incremental purchased funds at September 30, 2014 included the ability to purchase federal funds, sell securities under agreements to repurchase, as well as issue deposits to institutional investors and issue certificates of deposit through brokers. Purchased funds totaled $319 million at September 30, 2014, compared to $602 million at December 31, 2013. At September 30, 2014, the Bank had pledged loans totaling $25 billion which provided for up to $19 billion of available collateralized borrowing with the FRB.

The Bank is a member of the FHLB of Dallas, Texas, which provides short- and long-term funding to its members through advances collateralized by real estate-related assets. Actual borrowing capacity is contingent on the amount of collateral available to be pledged to the FHLB. At September 30, 2014, real estate-related loans pledged to the FHLB as blanket collateral provided for potential future borrowings of approximately $6 billion. Additionally, the Bank had the ability to issue up to $15.0 billion of debt at September 30, 2014 under an existing $15 billion medium-term senior note program which allows the issuance of debt with maturities between three months and 30 years.

The Corporation maintains a shelf registration statement with the Securities and Exchange Commission from which it may issue debt and/or equity securities. Under the shelf registration, on May 23, 2014, the Corporation issued $350 million of 2.125% medium-term senior notes due in 2019 and on July 22, 2014 issued $250 million of 3.80% subordinated notes due in 2026. Both issuances were swapped to floating rates based on 6-month LIBOR indices.

The FRB completed its 2014 CCAR review in March 2014 and did not object to Comerica's capital plan and capital distributions contemplated in the plan. Comerica's capital plan includes the authority to fully redeem $150 million par value of 8.375% subordinated notes due 2024. The notes were called at par on July 15, 2014, resulting in a pretax gain of approximately $32 million.

Further information regarding the Corporation's medium- and long-term debt is provided in Note 7 to these unaudited financial statements.

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The ability of the Corporation and the Bank to raise funds at competitive rates is impacted by rating agencies' views of the credit quality, liquidity, capital and earnings of the Corporation and the Bank. As of September 30, 2014, the four major rating agencies had assigned the following ratings to long-term senior unsecured obligations of the Corporation and the Bank. A security rating is not a recommendation to buy, sell, or hold securities and may be subject to revision or withdrawal at any time by the assigning rating agency. Each rating should be evaluated independently of any other rating.

	Comerica Incorporated		Comerica Bank
September 30, 2014	Rating	Outlook	Rating	Outlook
Standard and Poor’s	A-	Stable	A	Stable
Moody’s Investors Service	A3	Stable	A2	Stable
Fitch Ratings	A	Stable	A	Stable
DBRS	A	Stable	A (High)	Stable

The Corporation satisfies liquidity requirements with either liquid assets or various funding sources. Liquid assets, which totaled $14.3 billion at September 30, 2014, compared to $12.6 billion at December 31, 2013, before any applicable regulatory haircuts, provide a reservoir of liquidity. Liquid assets include cash and due from banks, federal funds sold, interest-bearing deposits with banks, other short-term investments and unencumbered investment securities available-for-sale. At September 30, 2014, the Corporation held deposits at the FRB of $6.6 billion, compared to $5.2 billion at December 31, 2013.

CRITICAL ACCOUNTING POLICIES

The Corporation’s consolidated financial statements are prepared based on the application of accounting policies, the most significant of which are described in Note 1 to the consolidated financial statements included in the Corporation's 2013 Annual Report. These policies require numerous estimates and strategic or economic assumptions, which may prove inaccurate or subject to variations. Changes in underlying factors, assumptions or estimates could have a material impact on the Corporation’s future financial condition and results of operations. At December 31, 2013, the most critical of these significant accounting policies were the policies related to the allowance for credit losses, valuation methodologies, goodwill, pension plan accounting and income taxes. These policies were reviewed with the Audit Committee of the Corporation’s Board of Directors and are discussed more fully on pages F-41 through F-46 in the Corporation's 2013 Annual Report. As of the date of this report, there have been no significant changes to the Corporation's critical accounting policies or estimates, except as discussed below.

Allowance for Credit Losses

In the second quarter 2014, the Corporation enhanced the approach used to determine the standard reserve factors used in estimating the allowance for credit losses, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly.

For further discussion of the methodology used in the determination of the allowance for credit losses, refer to the "Allowance for Credit Losses" section in this financial review and Note 1 to the unaudited consolidated financial statements.

Goodwill

Goodwill is initially recorded as the excess of the purchase price over the fair value of net assets acquired in a business combination and is subsequently evaluated at least annually for impairment. Goodwill impairment testing is performed at the reporting unit level, equivalent to a business segment or one level below. The Corporation has three reporting units: the Business Bank, the Retail Bank and Wealth Management. At September 30, 2014 and December 31, 2013, goodwill totaled $635 million, including $380 million allocated to the Business Bank, $194 million allocated to the Retail Bank and $61 million allocated to Wealth Management.

The Corporation performs its annual evaluation of goodwill impairment in the third quarter of each year and on an interim basis if events or changes in circumstances between annual tests suggest additional testing may be warranted to determine if goodwill might be impaired. The goodwill impairment test is a two-step test. The first step of the goodwill impairment test compares the estimated fair value of identified reporting units with their carrying amount, including goodwill. If the estimated fair value of the reporting unit is less than the carrying value, the second step must be performed to determine the implied fair value of the reporting unit's goodwill and the amount of goodwill impairment, if any. The implied fair value of goodwill is determined as if the reporting unit were being acquired in a business combination. If the implied fair value of goodwill exceeds the goodwill assigned to the reporting unit, there is no impairment. If the goodwill assigned to a reporting unit exceeds the implied fair value of goodwill, an impairment charge is recorded for the excess.

In performing the annual impairment test, the carrying value of each reporting unit is the greater of economic or regulatory capital. The Corporation assigns economic capital using internal management methodologies on the basis of each reporting unit's

62

credit, operational and interest rate risks, as well as goodwill. To determine regulatory capital, each reporting unit is assigned sufficient capital such that their respective Tier 1 ratio, based on allocated risk-weighted assets, is the same as that of the Corporation. Using this two-pronged approach, the Corporation's equity is fully allocated to its reporting units except for capital held primarily for the risk associated with the securities portfolio which is assigned to the Finance segment of the Corporation.

Determining the fair value of reporting units is a subjective process involving the use of estimates and judgments related to the selection of inputs such as future cash flows, discount rates, comparable public company multiples, applicable control premiums and economic expectations used in determining the interest rate environment. The estimated fair values of the reporting units are determined using a blend of two commonly used valuation techniques: the market approach and the income approach. For the market approach, valuations of reporting units consider a combination of earnings, equity and other multiples from companies with characteristics similar to the reporting unit. Since the fair values determined under the market approach are representative of noncontrolling interests, the valuations accordingly incorporate a control premium. For the income approach, estimated future cash flows and terminal value are discounted. Estimated future cash flows are derived from internal forecasts and economic expectations for each reporting unit which incorporate uncertainty factors inherent to long-term projections. The applicable discount rate is based on the imputed cost of equity capital appropriate for each reporting unit, which incorporates the risk-free rate of return, the level of non-diversified risk associated with companies with characteristics similar to the reporting unit, a size risk premium and a market equity risk premium.

The annual test of goodwill impairment was performed as of the beginning of the third quarter 2014. The Corporation's assumptions included maintaining the low Federal funds target rate through mid-2015 with modest increases thereafter until eventually reaching a normal interest rate environment. At the conclusion of the first step of the annual goodwill impairment tests performed in the third quarter 2014, the estimated fair values of all reporting units substantially exceeded their carrying amounts, including goodwill. The results of the annual test of the goodwill impairment test for each reporting unit were subjected to stress testing as appropriate.

Economic conditions impact the assumptions related to interest and growth rates, loss rates and imputed cost of equity capital. The fair value estimates for each reporting unit incorporated current economic and market conditions, including the recent Federal Reserve announcements and the impact of legislative and regulatory changes, to the extent known and as described above. However, further weakening in the economic environment, such as adverse changes in interest rates, a decline in the performance of the reporting units or other factors could cause the fair value of one or more of the reporting units to fall below their carrying value, resulting in a goodwill impairment charge. Additionally, new legislative or regulatory changes not anticipated in management's expectations may cause the fair value of one or more of the reporting units to fall below the carrying value, resulting in a goodwill impairment charge. Any impairment charge would not affect the Corporation's regulatory capital ratios, tangible common equity ratio or liquidity position.

63

SUPPLEMENTAL FINANCIAL DATA

The following table provides a reconciliation of non-GAAP financial measures used in this financial review with financial measures defined by GAAP.

(dollar amounts in millions)	September 30, 2014			December 31, 2013
Tier 1 Common Capital Ratio:
Tier 1 and Tier 1 common capital (a) (b)	$	7,105		$	6,895
Risk-weighted assets (a) (b)	66,481			64,825
Tier 1 and Tier 1 common risk-based capital ratio (b)	10.69		%	10.64		%
Basel III Common Equity Tier 1 Capital Ratio:
Tier 1 common capital (b)	$	7,105		$	6,895
Basel III adjustments (c)	(1		)	(6		)
Basel III common equity Tier 1 capital (c)	$	7,104		$	6,889
Risk-weighted assets (a) (b)	$	66,481		$	64,825
Basel III adjustments (c)	1,627			1,754
Basel III risk-weighted assets (c)	$	68,108		$	66,579
Tier 1 common capital ratio (b)	10.7		%	10.6		%
Basel III common equity Tier 1 capital ratio (c)	10.4			10.3
Tangible Common Equity Ratio:
Common shareholders' equity	$	7,433		$	7,150
Less:
Goodwill	635			635
Other intangible assets	15			17
Tangible common equity	$	6,783		$	6,498
Total assets	$	68,887		$	65,224
Less:
Goodwill	635			635
Other intangible assets	15			17
Tangible assets	$	68,237		$	64,572
Common equity ratio	10.79		%	10.97		%
Tangible common equity ratio	9.94			10.07
Tangible Common Equity per Share of Common Stock:
Common shareholders' equity	$	7,433		$	7,150
Tangible common equity	6,783			6,498
Shares of common stock outstanding (in millions)	180			182
Common shareholders' equity per share of common stock	$	41.26		$	39.22
Tangible common equity per share of common stock	37.65			35.64

(a) Tier 1 capital and risk-weighted assets as defined by regulation.

(b) September 30, 2014 Tier 1 capital and risk-weighted-assets are estimated.

(c) Estimated ratios based on the standardized approach in the final rule for the U.S. adoption of the Basel III regulatory capital framework, excluding most elements of AOCI.

The Tier 1 common capital ratio removes preferred stock and qualifying trust preferred securities from Tier 1 capital as defined by and calculated in conformity with bank regulations. The Basel III common equity Tier 1 capital ratio further adjusts Tier 1 common capital and risk-weighted assets to account for the final rule approved by U.S. banking regulators in July 2013 for the U.S. adoption of the Basel III regulatory capital framework. The final Basel III capital rules are effective January 1, 2015 for banking organizations subject to the standardized approach. The tangible common equity ratio removes preferred stock and the effect of intangible assets from capital and the effect of intangible assets from total assets and tangible common equity per share of common stock removes the effect of intangible assets from common shareholders' equity per share of common stock. The Corporation believes these measurements are meaningful measures of capital adequacy used by investors, regulators, management and others to evaluate the adequacy of common equity and to compare against other companies in the industry.

64

ITEM 3. Quantitative and Qualitative Disclosures about Market Risk

Quantitative and qualitative disclosures for the current period can be found in the "Market and Liquidity Risk" section of "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."

ITEM 4. Controls and Procedures

(a) Evaluation of Disclosure Controls and Procedures. The Corporation maintains a set of disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) that are designed to ensure that information required to be disclosed by the Corporation in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms, and that such information is accumulated and communicated to the Corporation's management, including the Corporation's Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. Management has evaluated, with the participation of the Corporation's Chief Executive Officer and Chief Financial Officer, the effectiveness of the Corporation's disclosure controls and procedures as of the end of the period covered by this quarterly report (the "Evaluation Date"). Based on the evaluation, the Corporation's Chief Executive Officer and Chief Financial Officer have concluded that, as of the Evaluation Date, the Corporation's disclosure controls and procedures are effective.

(b) Changes in Internal Control Over Financial Reporting. During the period to which this report relates, there have not been any changes in the Corporation's internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that have materially affected, or that are reasonably likely to materially affect, such controls.

PART II. OTHER INFORMATION

ITEM 1. Legal Proceedings

For information regarding the Corporation's legal proceedings, see "Part I. Item 1. Note 12 – Contingent Liabilities," which is incorporated herein by reference.

ITEM 1A. Risk Factors

There has been no material change in the Corporation’s risk factors as previously disclosed in our Form 10-K for the fiscal year ended December 31, 2013 in response to Part I, Item 1A. of such Form 10-K. Such risk factors are incorporated herein by reference.

ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds

For information regarding the Corporation's purchase of equity securities, see "Part I. Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations – Capital," which is incorporated herein by reference.

65

ITEM 6. Exhibits

Exhibit No.	Description
3.1	Restated Certificate of Incorporation of Comerica Incorporated (filed as Exhibit 3.2 to Registrant's Current Report on Form 8-K dated August 4, 2010, and incorporated herein by reference).
3.2	Certificate of Amendment to Restated Certificate of Incorporation of Comerica Incorporated (filed as Exhibit 3.2 to Registrant's Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, and incorporated herein by reference).
3.3	Amended and Restated Bylaws of Comerica Incorporated (filed as Exhibit 3.3 to Registrant's Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, and incorporated herein by reference).
4	[In accordance with Regulation S-K Item No. 601(b)(4)(iii), the Registrant is not filing copies of instruments defining the rights of holders of long-term debt because none of those instruments authorizes debt in excess of 10% of the total assets of the registrant and its subsidiaries on a consolidated basis. The Registrant hereby agrees to furnish a copy of any such instrument to the SEC upon request.]
10.1†	Form of Standard Comerica Incorporated Non-Qualified Stock Option Agreement under the Comerica Incorporated Amended and Restated 2006 Long-Term Incentive Plan (2014 version 2) (filed as Exhibit 10.1 to Registrant's Current Report on Form 8-K dated July 22, 2014, and incorporated herein by reference).
10.2†	Form of Standard Comerica Incorporated Restricted Stock Award Agreement (non-cliff vesting) under the Amended and Restated Comerica Incorporated 2006 Long-Term Incentive Plan (2014 version 2) (filed as Exhibit 10.2 to Registrant's Current Report on Form 8-K dated July 22, 2014, and incorporated herein by reference).
10.3†	Form of Standard Comerica Incorporated Senior Executive Long-Term Performance Restricted Stock Unit Award Agreement under the Amended and Restated Comerica Incorporated 2006 Long-Term Incentive Plan (2014 version 2) (filed as Exhibit 10.3 to Registrant's Current Report on Form 8-K dated July 22, 2014, and incorporated herein by reference).
31.1	Chairman, President and CEO Rule 13a-14(a)/15d-14(a) Certification of Periodic Report (pursuant to Section 302 of the Sarbanes-Oxley Act of 2002).
31.2	Vice Chairman and CFO Rule 13a-14(a)/15d-14(a) Certification of Periodic Report (pursuant to Section 302 of the Sarbanes-Oxley Act of 2002).
32	Section 1350 Certification of Periodic Report (pursuant to Section 906 of the Sarbanes-Oxley Act of 2002).
101	Financial statements from Quarterly Report on Form 10-Q of the Registrant for the quarter ended September 30, 2014, formatted in Extensible Business Reporting Language: (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Comprehensive Income, (iii) the Consolidated Statements of Changes in Shareholders' Equity, (iv) the Consolidated Statements of Cash Flows and (v) the Notes to Consolidated Financial Statements.
†	Management contract or compensatory plan or arrangement.

66

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

COMERICA INCORPORATED

(Registrant)

/s/ Muneera S. Carr

Muneera S. Carr

Executive Vice President and

Chief Accounting Officer and

Duly Authorized Officer

Date: October 28, 2014

67

EXHIBIT INDEX

Exhibit No.	Description
3.1	Restated Certificate of Incorporation of Comerica Incorporated (filed as Exhibit 3.2 to Registrant's Current Report on Form 8-K dated August 4, 2010, and incorporated herein by reference).
3.2	Certificate of Amendment to Restated Certificate of Incorporation of Comerica Incorporated (filed as Exhibit 3.2 to Registrant's Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, and incorporated herein by reference).
3.3	Amended and Restated Bylaws of Comerica Incorporated (filed as Exhibit 3.3 to Registrant's Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, and incorporated herein by reference).
4	[In accordance with Regulation S-K Item No. 601(b)(4)(iii), the Registrant is not filing copies of instruments defining the rights of holders of long-term debt because none of those instruments authorizes debt in excess of 10% of the total assets of the registrant and its subsidiaries on a consolidated basis. The Registrant hereby agrees to furnish a copy of any such instrument to the SEC upon request.]
10.1†	Form of Standard Comerica Incorporated Non-Qualified Stock Option Agreement under the Comerica Incorporated Amended and Restated 2006 Long-Term Incentive Plan (2014 version 2) (filed as Exhibit 10.1 to Registrant's Current Report on Form 8-K dated July 22, 2014, and incorporated herein by reference).
10.2†	Form of Standard Comerica Incorporated Restricted Stock Award Agreement (non-cliff vesting) under the Amended and Restated Comerica Incorporated 2006 Long-Term Incentive Plan (2014 version 2) (filed as Exhibit 10.2 to Registrant's Current Report on Form 8-K dated July 22, 2014, and incorporated herein by reference).
10.3†	Form of Standard Comerica Incorporated Senior Executive Long-Term Performance Restricted Stock Unit Award Agreement under the Amended and Restated Comerica Incorporated 2006 Long-Term Incentive Plan (2014 version 2) (filed as Exhibit 10.3 to Registrant's Current Report on Form 8-K dated July 22, 2014, and incorporated herein by reference).
31.1	Chairman, President and CEO Rule 13a-14(a)/15d-14(a) Certification of Periodic Report (pursuant to Section 302 of the Sarbanes-Oxley Act of 2002)
31.2	Vice Chairman and CFO Rule 13a-14(a)/15d-14(a) Certification of Periodic Report (pursuant to Section 302 of the Sarbanes-Oxley Act of 2002)
32	Section 1350 Certification of Periodic Report (pursuant to Section 906 of the Sarbanes-Oxley Act of 2002)
101	Financial statements from Quarterly Report on Form 10-Q of the Registrant for the quarter ended September 30, 2014, formatted in Extensible Business Reporting Language: (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Comprehensive Income, (iii) the Consolidated Statements of Changes in Shareholders' Equity, (iv) the Consolidated Statements of Cash Flows and (v) the Notes to Consolidated Financial Statements.
†	Management contract or compensatory plan or arrangement.

68

EX-31.1

Exhibit 31.1

Chairman, President and CEO Rule 13a-14(a)/15d-14(a) Certification of Periodic Report (pursuant to Section 302 of the Sarbanes-Oxley Act of 2002)

CERTIFICATION OF PERIODIC REPORT

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Ralph W. Babb, Jr., certify that:

1. I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2014 of Comerica Incorporated (the “Registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

4. The Registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the Registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the Registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the Registrant's internal control over financial reporting that occurred during the Registrant's most recent fiscal quarter (the Registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Registrant's internal control over financial reporting; and

5. The Registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant's auditors and the audit committee of the Registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant's internal control over financial reporting.

Date:	October 28, 2014	/s/ Ralph W. Babb, Jr.
		Ralph W. Babb, Jr.
		Chairman, President and
		Chief Executive Officer

EX-31.2

Exhibit 31.2

Vice Chairman and CFO Rule 13a-14(a)/15d-14(a) Certification of Periodic Report (pursuant to Section 302 of the Sarbanes-Oxley Act of 2002)

CERTIFICATION OF PERIODIC REPORT

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Karen L. Parkhill, certify that:

1. I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2014 of Comerica Incorporated (the “Registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

4. The Registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the Registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the Registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the Registrant's internal control over financial reporting that occurred during the Registrant's most recent fiscal quarter (the Registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Registrant's internal control over financial reporting; and

5. The Registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant's auditors and the audit committee of the Registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant's internal control over financial reporting.

Date:	October 28, 2014	/s/ Karen L. Parkhill
		Karen L. Parkhill
		Vice Chairman and
		Chief Financial Officer

EX-32

Exhibit 32

Section 1350 Certification of Periodic Report (pursuant to Section 906 of the Sarbanes-Oxley Act of 2002)

CERTIFICATION OF PERIODIC REPORT

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned, Ralph W. Babb, Jr., Chairman, President and Chief Executive Officer, and Karen L. Parkhill, Vice Chairman and Chief Financial Officer, of Comerica Incorporated (the “Company”), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

(1) the Quarterly Report on Form 10-Q of the Company for the quarterly period ended September 30, 2014 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	October 28, 2014	/s/ Ralph W. Babb, Jr.
		Ralph W. Babb, Jr.
		Chairman, President and
		Chief Executive Officer
		/s/ Karen L. Parkhill
		Karen L. Parkhill
		Vice Chairman and
		Chief Financial Officer

XML

Investment Securities (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Securities with no credit impairment in unrealized loss position	162
Amortized cost securities	$ 9,253,000,000
Fair value securities	9,230,000,000
Carrying value of securities pledged	3,100,000,000
Liabilities secured by pledged collateral	2,100,000,000
Residential Mortgage-Backed Securities
Securities with no credit impairment in unrealized loss position	101
Amortized cost securities	9,100,000,000
Fair value securities	9,100,000,000
Auction Rate Preferred Securities
Securities with no credit impairment in unrealized loss position	43
State And Municipal Securities
Securities with no credit impairment in unrealized loss position	17
Corporate Debt Securities
Securities with no credit impairment in unrealized loss position	1
Auction-Rate Securities
ARS portfolio redeemed or sold since acquisition	89.00%
ARS portfolio redeemed or sold since acquisition at or above cost	95.00%
Amortized cost securities	24,000,000
Fair value securities	$ 23,000,000

XML

Credit Quality And Allowance For Credit Losses (Acquired Purchased Credit-Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Credit Quality And Allowance For Credit Losses [Abstract]
Carrying amount PCI loans	$ 3	$ 5
Outstanding balance PCI loans	$ 17	$ 46

XML

Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Loan Losses And Related Loan Amounts) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses	$ 5		$ 8		$ 25		$ 37
PCI loans	3				3				5
Total loans	47,708				47,708				45,470
Allowance for PCI loans	0				0				0
Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	43,588				43,588				41,536
Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,120				4,120				3,934
Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	591		613		598		629
Loan charge-offs	(24)		(39)		(82)		(112)
Recoveries on loans previously charged-off	21		20		58		52
Net loan charge-offs	(3)		(19)		(24)		(60)
Provision for loan losses	4		10		18		35
Balance at end of period	592		604		592		604
As a percentage of total loans	1.24%		1.37%		1.24%		1.37%
Allowance for loan losses individually evaluated for impairment	40		67		40		67
Allowance for loan losses collectively evaluated for impairment	552		537		552		537
Total allowance for loan losses	592		604		592		604
Loans individually evaluated for impairment	248		346		248		346
Loans collectively evaluated for impairment	47,457		43,790		47,457		43,790
PCI loans	3	[1]	15	[1]	3	[1]	15	[1]
Total loans	47,708		44,151		47,708		44,151
Financing Receivable [Member] | Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	528		542		531		552
Loan charge-offs	(20)		(30)		(71)		(94)
Recoveries on loans previously charged-off	19		18		50		45
Net loan charge-offs	(1)		(12)		(21)		(49)
Provision for loan losses	2		5		19		32
Balance at end of period	529		535		529		535
As a percentage of total loans	1.21%		1.32%		1.21%		1.32%
Allowance for loan losses individually evaluated for impairment	40		67		40		67
Allowance for loan losses collectively evaluated for impairment	489		468		489		468
Total allowance for loan losses	529		535		529		535
Loans individually evaluated for impairment	204		294		204		294
Loans collectively evaluated for impairment	43,384		40,045		43,384		40,045
PCI loans	0	[1]	10	[1]	0	[1]	10	[1]
Total loans	43,588		40,349		43,588		40,349
Financing Receivable [Member] | Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	63		71		67		77
Loan charge-offs	(4)		(9)		(11)		(18)
Recoveries on loans previously charged-off	2		2		8		7
Net loan charge-offs	(2)		(7)		(3)		(11)
Provision for loan losses	2		5		(1)		3
Balance at end of period	63		69		63		69
As a percentage of total loans	1.52%		1.83%		1.52%		1.83%
Allowance for loan losses individually evaluated for impairment	0		0		0		0
Allowance for loan losses collectively evaluated for impairment	63		69		63		69
Total allowance for loan losses	63		69		63		69
Loans individually evaluated for impairment	44		52		44		52
Loans collectively evaluated for impairment	4,073		3,745		4,073		3,745
PCI loans	3	[1]	5	[1]	3	[1]	5	[1]
Total loans	$ 4,120		$ 3,802		$ 4,120		$ 3,802

[1] No allowance for loan losses was required for PCI loans at September 30, 2014 and 2013.

XML

Income Taxes And Tax-Related Items Income Taxes And Tax-Related Items (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 14	$ 11
Increase in unrecognized tax benefits	3
Reasonably possible decrease in unrecognized tax benefits in next 12 months	9
Tax-related interest and penalties payable	2	2
Net deferred tax assets	200	256
Decrease in net deferred tax assets	56
Valuation allowance for deferred tax assets	$ 0	$ 0

XML

Credit Quality And Allowance For Credit Losses (Accretable Yield For Acquired Purchased Credit-Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Credit Quality And Allowance For Credit Losses [Abstract]
Balance at beginning of period	$ 6	$ 10	$ 15	$ 16
Reclassifications from nonaccretable	1	4	10	4
Accretion	(1)	(3)	(19)	(9)
Balance at end of period	$ 6	$ 11	$ 6	$ 11

XML

Credit Quality And Allowance For Credit Losses (Loans By Credit Quality Indicator) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 47,708		$ 45,470
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	45,614	[1]	43,210	[1]
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	844	[2]	860	[2]
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	921	[3]	1,050	[3]
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	329	[4]	350	[4]
Business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	43,588		41,536
Business loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,592	[1]	39,392	[1]
Business loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	835	[2]	850	[2]
Business loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	906	[3]	1,032	[3]
Business loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	255	[4]	262	[4]
Business loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	30,759		28,815
Business loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	29,439	[1]	27,470	[1]
Business loans | Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	545	[2]	590	[2]
Business loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	682	[3]	674	[3]
Business loans | Commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	93	[4]	81	[4]
Business loans | Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,992		1,762
Business loans | Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,955	[1]	1,713	[1]
Business loans | Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	19	[2]	13	[2]
Business loans | Real estate construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[3]	15	[3]
Business loans | Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	18	[4]	21	[4]
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,683	[5]	1,447	[5]
Business loans | Real estate construction | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,654	[1],[5]	1,399	[1],[5]
Business loans | Real estate construction | Commercial Real Estate business line | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	12	[2],[5]	13	[2],[5]
Business loans | Real estate construction | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[3],[5]	15	[3],[5]
Business loans | Real estate construction | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	17	[4],[5]	20	[4],[5]
Business loans | Real estate construction | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	309	[6]	315	[6]
Business loans | Real estate construction | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	301	[1],[6]	314	[1],[6]
Business loans | Real estate construction | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	7	[2],[6]	0	[2],[6]
Business loans | Real estate construction | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[3],[6]	0	[3],[6]
Business loans | Real estate construction | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	1	[4],[6]	1	[4],[6]
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,603		8,787
Business loans | Commercial mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,026	[1]	8,070	[1]
Business loans | Commercial mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	224	[2]	237	[2]
Business loans | Commercial mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	209	[3]	324	[3]
Business loans | Commercial mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	144	[4]	156	[4]
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,743	[5]	1,678	[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,590	[1],[5]	1,474	[1],[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	75	[2],[5]	92	[2],[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	29	[3],[5]	61	[3],[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	49	[4],[5]	51	[4],[5]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,860	[6]	7,109	[6]
Business loans | Commercial mortgage | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,436	[1],[6]	6,596	[1],[6]
Business loans | Commercial mortgage | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	149	[2],[6]	145	[2],[6]
Business loans | Commercial mortgage | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	180	[3],[6]	263	[3],[6]
Business loans | Commercial mortgage | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	95	[4],[6]	105	[4],[6]
Business loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans	805		845
Business loans | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	765	[1]	841	[1]
Business loans | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	37	[2]	3	[2]
Business loans | Lease financing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	3	[3]	1	[3]
Business loans | Lease financing | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[4]	0	[4]
Business loans | International
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,429		1,327
Business loans | International | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,407	[1]	1,298	[1]
Business loans | International | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	10	[2]	7	[2]
Business loans | International | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	12	[3]	18	[3]
Business loans | International | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[4]	4	[4]
Retail loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,120		3,934
Retail loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,022	[1]	3,818	[1]
Retail loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	9	[2]	10	[2]
Retail loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	15	[3]	18	[3]
Retail loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	74	[4]	88	[4]
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,797		1,697
Retail loans | Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,746	[1]	1,635	[1]
Retail loans | Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	4	[2]	3	[2]
Retail loans | Residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	5	[3]	6	[3]
Retail loans | Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	42	[4]	53	[4]
Retail loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,323		2,237
Retail loans | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,276	[1]	2,183	[1]
Retail loans | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	5	[2]	7	[2]
Retail loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	10	[3]	12	[3]
Retail loans | Consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	32	[4]	35	[4]
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,634		1,517
Retail loans | Consumer | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,593	[1]	1,475	[1]
Retail loans | Consumer | Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	[2]	4	[2]
Retail loans | Consumer | Home equity | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	8	[3]	5	[3]
Retail loans | Consumer | Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	31	[4]	33	[4]
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	689		720
Retail loans | Consumer | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	683	[1]	708	[1]
Retail loans | Consumer | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	3	[2]	3	[2]
Retail loans | Consumer | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	[3]	7	[3]
Retail loans | Consumer | Other consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1	[4]	$ 2	[4]

[1] Includes all loans not included in the categories of special mention, substandard or nonaccrual.

[2] Special mention loans are accruing loans that have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date.

[3] Substandard loans are accruing loans that have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans also are distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. PCI loans are included in the substandard category. This category is generally consistent with the "substandard" category as defined by regulatory authorities.

[4] Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-58 in the Corporation's 2013 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.

[5] Primarily loans to real estate developers.

[6] Primarily loans secured by owner-occupied real estate.

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Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Derivative assets	$ 420			$ 420			$ 500
Fair value of derivative liability	210			210			249
Commitments to fund additional investments in nonmarketable equity securities	5			5
Underlying assets of funds, estimated liquidation period, years, maximum				15 years
Federal Home Loan Bank stock	7			7			48
Federal Reserve Bank stock	85			85			85
Recurring
Derivative assets	424			424			503
Transfers into or out of Level 1 or Level 2 or Level 3	0		0	0		0
Total liabilities at fair value	310			310			347
Nonrecurring
Commitments to fund additional investments in nonmarketable equity securities	0			0			0
Total liabilities at fair value	0			0			0
Carrying Amount
Carrying value of nonmarketable equity securities	12	[1]		12	[1]		12	[1]
Warrants | Recurring
Derivative assets	4			4			3
Visa derivative contract
Fair value of derivative liability	$ 3			$ 3			$ 2

[1] Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

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Business Segment Information (Business Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Net interest income (expense) (FTE)			$ 1,243		$ 1,244
Provision for credit losses	5	8	25		37
Noninterest income	215	228	643		663
Noninterest expenses	397	417	1,207		1,249
Provision (benefit) for income taxes (FTE)			210		197
Net income (loss)	154	147	444		424
Net credit-related charge-offs			24		60
Assets, average			65,336		63,707
Loans, average			46,327		44,533
Deposits, average			53,781		51,355
Return on average assets			0.91%	[1]	0.89%	[1]
Efficiency ratio			63.99%	[2]	65.45%	[2]
Business Bank
Net interest income (expense) (FTE)			1,124		1,115
Provision for credit losses			45		29
Noninterest income			275		287
Noninterest expenses			441		446
Provision (benefit) for income taxes (FTE)			311		312
Net income (loss)			602		615
Net credit-related charge-offs			16		37
Assets, average			37,094		35,694
Loans, average			36,124		34,626
Deposits, average			27,755		25,931
Return on average assets			2.17%	[1]	2.30%	[1]
Efficiency ratio			31.56%	[2]	31.78%	[2]
Retail Bank
Net interest income (expense) (FTE)			446		460
Provision for credit losses			(2)		21
Noninterest income			123		132
Noninterest expenses			524		530
Provision (benefit) for income taxes (FTE)			16		14
Net income (loss)			31		27
Net credit-related charge-offs			7		18
Assets, average			6,074		5,967
Loans, average			5,406		5,278
Deposits, average			21,600		21,183
Return on average assets			0.19%	[1]	0.17%	[1]
Efficiency ratio			91.81%	[2]	89.19%	[2]
Wealth Management
Net interest income (expense) (FTE)			139		138
Provision for credit losses			(11)		(8)
Noninterest income			195		191
Noninterest expenses			239		238
Provision (benefit) for income taxes (FTE)			38		35
Net income (loss)			68		64
Net credit-related charge-offs			1		5
Assets, average			4,981		4,785
Loans, average			4,797		4,629
Deposits, average			3,934		3,722
Return on average assets			1.81%	[1]	1.78%	[1]
Efficiency ratio			71.95%	[2]	72.64%	[2]
Finance
Net interest income (expense) (FTE)			(485)		(492)
Provision for credit losses			0		0
Noninterest income			44		47
Noninterest expenses			(24)		7
Provision (benefit) for income taxes (FTE)			(160)		(168)
Net income (loss)			(257)		(284)
Net credit-related charge-offs			0		0
Assets, average			11,070		11,553
Loans, average			0		0
Deposits, average			246		309
Other
Net interest income (expense) (FTE)			19		23
Provision for credit losses			(7)		(5)
Noninterest income			6		6
Noninterest expenses			27		28
Provision (benefit) for income taxes (FTE)			5		4
Net income (loss)			0		2
Net credit-related charge-offs			0		0
Assets, average			6,117		5,708
Loans, average			0		0
Deposits, average			$ 246		$ 210

[1] Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

[2] Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

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Derivative And Credit-Related Financial Instruments (Schedule Of Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	$ 21,396	[1]	$ 20,538	[1]
Fair Value of Gross Derivative Assets	420		500
Fair Value of Gross Derivative Liabilities	210		249
Derivative Asset, Netting Adjustment - Offsetting Liabilities	(123)		(187)
Derivative Liability, Netting Adjustment - Offsetting Assets	(123)		(187)
Derivative Asset, Netting Adjustment - Cash Collateral Received	(11)		(2)
Derivative Liability, Netting Adjustment, Cash Collateral Posted	0		(10)
Net Derivative Assets Included in the Consolidated Balance Sheets	286	[2]	311	[2]
Net Derivative Liabilities Included in the Consolidated Balance Sheets	87	[2]	52	[2]
Derivative Asset, Securities Pledged As Collateral	(121)		(138)
Derivative Liability, Securities Pledged As Collateral	(1)		(10)
Net Derivative Assets After Deducting Amounts Not Offset in the Consolidated Balance Sheets	165		173
Net Derivative Liabilities After Deducting Amounts Not Offset in the Consolidated Balance Sheets	86		42
Derivative Credit Risk Valuation Adjustment, Derivative Assets	2		2
Risk Management Purposes
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	2,226	[1]	1,703	[1]
Fair Value of Gross Derivative Assets	165		199
Fair Value of Gross Derivative Liabilities	6		0
Risk Management Purposes | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	1,800	[1]	1,450	[1]
Fair Value of Gross Derivative Assets	164		198
Fair Value of Gross Derivative Liabilities	2		0
Risk Management Purposes | Derivatives Used As Economic Hedges | Foreign Exchange Spot Forward And Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	426	[1]	253	[1]
Fair Value of Gross Derivative Assets	1		1
Fair Value of Gross Derivative Liabilities	4		0
Customer-Initiated And Other Activities
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	19,170	[1]	18,835	[1]
Fair Value of Gross Derivative Assets	255		301
Fair Value of Gross Derivative Liabilities	204		249
Customer-Initiated And Other Activities | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	11,957	[1]	11,697	[1]
Fair Value of Gross Derivative Assets	142		182
Fair Value of Gross Derivative Liabilities	95		133
Customer-Initiated And Other Activities | Interest Rate Caps And Floors Written
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	277	[1]	277	[1]
Fair Value of Gross Derivative Assets	0		0
Fair Value of Gross Derivative Liabilities	0		1
Customer-Initiated And Other Activities | Interest Rate Caps and Floors Purchased
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	277	[1]	277	[1]
Fair Value of Gross Derivative Assets	0		1
Fair Value of Gross Derivative Liabilities	0		0
Customer-Initiated And Other Activities | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	11,403	[1]	11,143	[1]
Fair Value of Gross Derivative Assets	142		181
Fair Value of Gross Derivative Liabilities	95		132
Customer-Initiated And Other Activities | Energy Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	5,181	[1]	5,374	[1]
Fair Value of Gross Derivative Assets	86		105
Fair Value of Gross Derivative Liabilities	85		102
Customer-Initiated And Other Activities | Energy Caps and Floors Written
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	1,349	[1]	1,325	[1]
Fair Value of Gross Derivative Assets	3		1
Fair Value of Gross Derivative Liabilities	40		48
Customer-Initiated And Other Activities | Energy Caps and Floors Purchased
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	1,349	[1]	1,325	[1]
Fair Value of Gross Derivative Assets	40		48
Fair Value of Gross Derivative Liabilities	3		1
Customer-Initiated And Other Activities | Energy Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	2,483	[1]	2,724	[1]
Fair Value of Gross Derivative Assets	43		56
Fair Value of Gross Derivative Liabilities	42		53
Customer-Initiated And Other Activities | Foreign Exchange Spot, Forwards, Options and Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	2,032	[1]	1,764	[1]
Fair Value of Gross Derivative Assets	27		14
Fair Value of Gross Derivative Liabilities	$ 24		$ 14

[1] Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

[2] Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $2 million at both September 30, 2014 and December 31, 2013.

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Contingent Liabilities (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Pending Litigation	Dec. 31, 2013 Butte Local Development v. Masters Group v. Comerica Bank	Sep. 30, 2014 Butte Local Development v. Masters Group v. Comerica Bank	Jan. 17, 2014 Butte Local Development v. Masters Group v. Comerica Bank Comerica Bank
Loss Contingencies [Line Items]
Amount of damages awarded by the jury								$ 52,000,000
Increase in reserve for litigation-related expense	(2,000,000)	(4,000,000)	4,000,000	0		52,000,000
Litigation-related reserve related to the case							54,000,000
Minimum amount of reasonably possible losses					0
Estimated maximum amount of reasonably possible losses					44,000,000
Legal Fees	$ 8,000,000	$ 5,000,000	$ 18,000,000	$ 19,000,000

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Derivative And Credit-Related Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule Of Derivative Instruments

The following table presents the composition of the Corporation’s derivative instruments held or issued for risk management purposes or in connection with customer-initiated and other activities at September 30, 2014 and December 31, 2013. The table excludes commitments, warrants accounted for as derivatives and a derivative related to the Corporation’s 2008 sale of its remaining ownership of Visa shares.

	September 30, 2014								December 31, 2013
			Fair Value								Fair Value
(in millions)	Notional/ Contract Amount (a)		Gross Derivative Assets			Gross Derivative Liabilities			Notional/ Contract Amount (a)		Gross Derivative Assets			Gross Derivative Liabilities
Risk management purposes
Derivatives designated as hedging instruments
Interest rate contracts:
Swaps - fair value - receive fixed/pay floating	$	1,800	$	164		$	2		$	1,450	$	198		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	426		1			4			253		1			—
Total risk management purposes	2,226		165			6			1,703		199			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	277		—			—			277		—			1
Caps and floors purchased	277		—			—			277		1			—
Swaps	11,403		142			95			11,143		181			132
Total interest rate contracts	11,957		142			95			11,697		182			133
Energy contracts:
Caps and floors written	1,349		3			40			1,325		1			48
Caps and floors purchased	1,349		40			3			1,325		48			1
Swaps	2,483		43			42			2,724		56			53
Total energy contracts	5,181		86			85			5,374		105			102
Foreign exchange contracts:
Spot, forwards, options and swaps	2,032		27			24			1,764		14			14
Total customer-initiated and other activities	19,170		255			204			18,835		301			249
Total gross derivatives	$	21,396	420			210			$	20,538	500			249
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(123		)	(123		)			(187		)	(187		)
Netting adjustment - Cash collateral received/posted			(11		)	—					(2		)	(10		)
Net derivatives included in the consolidated balance sheets (b)			286			87					311			52
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(121		)	(1		)			(138		)	(10		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	165		$	86				$	173		$	42

(a) Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

(b) Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $2 million at both September 30, 2014 and December 31, 2013.

Schedule Of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps

The following table summarizes the expected weighted average remaining maturity of the notional amount of risk management interest rate swaps and the weighted average interest rates associated with amounts expected to be received or paid on interest rate swap agreements as of September 30, 2014 and December 31, 2013.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
September 30, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,800	4.8	4.54	%	0.49	%
December 31, 2013
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,450		3.4	5.45		0.38

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at September 30, 2014 and December 31, 2013.

Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives

The net gains recognized in income on customer-initiated derivative instruments, net of the impact of offsetting positions, were as follows.

		Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	Location of Gain	2014		2013		2014		2013
Interest rate contracts	Other noninterest income	$	3	$	8	$	11	$	17
Energy contracts	Other noninterest income	1		—		1		2
Foreign exchange contracts	Foreign exchange income	9		8		29		26
Total		$	13	$	16	$	41	$	45

Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk

The Corporation’s credit risk associated with these instruments is represented by the contractual amounts indicated in the following table.

(in millions)	September 30, 2014		December 31, 2013
Unused commitments to extend credit:
Commercial and other	$	28,158	$	27,728
Bankcard, revolving check credit and home equity loan commitments	2,138		1,889
Total unused commitments to extend credit	$	30,296	$	29,617
Standby letters of credit	$	3,942	$	4,297
Commercial letters of credit	65		103
Other credit-related financial instruments	3		2

Summary Of Criticized Letters Of Credit

The following table presents a summary of criticized standby and commercial letters of credit at September 30, 2014 and December 31, 2013. The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines.

(dollar amounts in millions)	September 30, 2014			December 31, 2013
Total criticized standby and commercial letters of credit	$	102		$	69
As a percentage of total outstanding standby and commercial letters of credit	2.5		%	1.6		%

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Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	$ 51		$ 62
Recorded investment in impaired loans with related allowance	197		212
Recorded investment total impaired loans	248		274
Unpaid principal balance	339		415
Related allowance for loan losses	40		57
Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	7		11
Recorded investment in impaired loans with related allowance	197		212
Recorded investment total impaired loans	204		223
Unpaid principal balance	301		344
Related allowance for loan losses	40		57
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	4		10
Recorded investment in impaired loans with related allowance	82		64
Recorded investment total impaired loans	86		74
Unpaid principal balance	124		121
Related allowance for loan losses	19		26
Business loans | Real estate construction
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	0		0
Recorded investment in impaired loans with related allowance	15		21
Recorded investment total impaired loans	15		21
Unpaid principal balance	17		25
Related allowance for loan losses	1		3
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	0	[1]	0	[1]
Recorded investment in impaired loans with related allowance	14	[1]	20	[1]
Recorded investment total impaired loans	14	[1]	20	[1]
Unpaid principal balance	16	[1]	24	[1]
Related allowance for loan losses	1	[1]	3	[1]
Business loans | Real estate construction | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	0	[2]	0	[2]
Recorded investment in impaired loans with related allowance	1	[2]	1	[2]
Recorded investment total impaired loans	1	[2]	1	[2]
Unpaid principal balance	1	[2]	1	[2]
Related allowance for loan losses	0	[2]	0	[2]
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	2		1
Recorded investment in impaired loans with related allowance	100		123
Recorded investment total impaired loans	102		124
Unpaid principal balance	159		194
Related allowance for loan losses	20		27
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	0	[1]	0	[1]
Recorded investment in impaired loans with related allowance	35	[1]	60	[1]
Recorded investment total impaired loans	35	[1]	60	[1]
Unpaid principal balance	68	[1]	104	[1]
Related allowance for loan losses	14	[1]	12	[1]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	2	[2]	1	[2]
Recorded investment in impaired loans with related allowance	65	[2]	63	[2]
Recorded investment total impaired loans	67	[2]	64	[2]
Unpaid principal balance	91	[2]	90	[2]
Related allowance for loan losses	6	[2]	15	[2]
Business loans | International
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	1		0
Recorded investment in impaired loans with related allowance	0		4
Recorded investment total impaired loans	1		4
Unpaid principal balance	1		4
Related allowance for loan losses	0		1
Retail loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	44	[3]	51	[3]
Recorded investment in impaired loans with related allowance	0	[3]	0	[3]
Recorded investment total impaired loans	44	[3]	51	[3]
Unpaid principal balance	38	[3]	71	[3]
Related allowance for loan losses	0	[3]	0	[3]
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	28		35
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	28		35
Unpaid principal balance	17		42
Related allowance for loan losses	0		0
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	16		16
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	16		16
Unpaid principal balance	21		29
Related allowance for loan losses	0		0
Retail loans | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	12		12
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	12		12
Unpaid principal balance	16		17
Related allowance for loan losses	0		0
Retail loans | Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	4		4
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	4		4
Unpaid principal balance	5		12
Related allowance for loan losses	$ 0		$ 0

[1] Primarily loans to real estate developers.

[2] Primarily loans secured by owner-occupied real estate.

[3] Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy changes which resulted in direct write-downs of restructured retail loans.

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Investment Securities Investment Securities (Gains and Losses on Available-For-Sale Securities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]
Securities gains			$ 1		$ 1
Securities losses			(1)	[1]	(2)	[1]
Net securities (losses) gains	$ (1)	$ 1	$ 0		$ (1)

[1] charges related to a derivative contract tied to the conversion rate of Visa Class B shares.

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Fair Value Measurements (Quantitative Information About Level 3 Measurements) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	$ 9,468	[1]	$ 9,307	[1]
Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	9,468		9,307
Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	137		159
Recurring | State And Municipal Securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	3.00%	[2]	5.00%	[2]
Unobservable Input, Workout period	1 year	[2]	3 years	[2]
Recurring | State And Municipal Securities | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	10.00%	[2]	10.00%	[2]
Unobservable Input, Workout period	3 years	[2]	4 years	[2]
Recurring | Equity and Other Non-Debt Securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	4.00%	[2]	5.00%	[2]
Unobservable Input, Workout period	1 year	[2]	2 years	[2]
Recurring | Equity and Other Non-Debt Securities | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	8.00%	[2]	8.00%	[2]
Unobservable Input, Workout period	2 years	[2]	3 years	[2]
State And Municipal Securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	23		22
State And Municipal Securities | Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	23		22
State And Municipal Securities | Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	23	[2]	22	[2]
Equity and Other Non-Debt Securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	238		258
Equity and Other Non-Debt Securities | Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	238		258
Equity and Other Non-Debt Securities | Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	$ 113	[2]	$ 136	[2]

[1] Included auction-rate securities at amortized cost and fair value of $138 million and $137 million, respectively, as of September 30, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

[2] Auction-rate securities.

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Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings By Type Of Modification) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	$ 9		$ 29		$ 17		$ 93
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	9	[1]	27	[1]	15	[1]	70	[1]
Extension Term, Minimum Period					90 days		90 days
Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		2		2		4
AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]			19	[2]
Business loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	8		21		14		80
Business loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	8	[1]	21	[1]	14	[1]	61	[1]
Business loans | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		0		0		0
Business loans | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]			19	[2]
Business loans | Commercial
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	2		3		3		21
Business loans | Commercial | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	2	[1]	3	[1]	3	[1]	13	[1]
Business loans | Commercial | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		0		0		0
Business loans | Commercial | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]			8	[2]
Business loans | Commercial mortgage
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	6		18		10		59
Business loans | Commercial mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	6	[1]	18	[1]	10	[1]	48	[1]
Business loans | Commercial mortgage | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		0		0		0
Business loans | Commercial mortgage | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]			11	[2]
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[3]	14	[3]	0	[3]	33	[3]
Business loans | Commercial mortgage | Commercial Real Estate business line | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[1],[3]	14	[1],[3]	0	[1],[3]	33	[1],[3]
Business loans | Commercial mortgage | Commercial Real Estate business line | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[3]	0	[3]	0	[3]	0	[3]
Business loans | Commercial mortgage | Commercial Real Estate business line | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2],[3]			0	[2],[3]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	6	[4]	4	[4]	10	[4]	26	[4]
Business loans | Commercial mortgage | Other business lines | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	6	[1],[4]	4	[1],[4]	10	[1],[4]	15	[1],[4]
Business loans | Commercial mortgage | Other business lines | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[4]	0	[4]	0	[4]	0	[4]
Business loans | Commercial mortgage | Other business lines | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2],[4]			11	[2],[4]
Business loans | International
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period					1		0
Business loans | International | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period					1	[1]	0	[1]
Business loans | International | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period					0		0
Business loans | International | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period							0	[2]
Retail loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1		8		3		13
Retail loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1]	6	[1]	1	[1]	9	[1]
Retail loans | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		2		2		4
Retail loans | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]			0	[2]
Retail loans | Residential mortgage
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		1		0		3
Retail loans | Residential mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[1]	0	[1]	0	[1]	1	[1],[5]
Retail loans | Residential mortgage | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		1		0		2
Retail loans | Residential mortgage | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]			0	[2]
Retail loans | Consumer
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1		7		3		10
Retail loans | Consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1]	6	[1]	1	[1]	8	[1]
Retail loans | Consumer | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		1		2		2
Retail loans | Consumer | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]			0	[2]
Retail loans | Consumer | Home equity
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1		5		3		7
Retail loans | Consumer | Home equity | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1],[5]	4	[1],[5]	1	[1],[5]	6	[1],[5]
Retail loans | Consumer | Home equity | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		1		2		1
Retail loans | Consumer | Home equity | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]			0	[2]
Retail loans | Consumer | Other consumer
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		2		0		3
Retail loans | Consumer | Other consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[1]	2	[1],[5]	0	[1]	2	[1],[5]
Retail loans | Consumer | Other consumer | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		0		0		1
Retail loans | Consumer | Other consumer | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			$ 0	[2]			$ 0	[2]

[1] Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates.

[2] Loan restructurings whereby the original loan is restructured into two notes: an "A" note, which generally reflects the portion of the modified loan which is expected to be collected; and a "B" note, which is either fully charged off or exchanged for an equity interest.

[3] Primarily loans to real estate developers.

[4] Primarily loans secured by owner-occupied real estate.

[5] Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

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Net Income Per Common Share (Basic And Diluted Net Income Per Common Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 154	$ 147	$ 444	$ 424
Less income allocated to participating securities	2	2	6	6
Net income attributable to common shares	$ 152	$ 145	$ 438	$ 418
Basic average common shares	179	182	179	184
Basic earnings per common share	$ 0.85	$ 0.80	$ 2.44	$ 2.28
Basic average common shares	179	182	179	184
Net effect of the assumed exercise of stock options	2	1	2	1
Net effect of the assumed exercise of warrants	4	4	5	2
Diluted average common shares	185	187	186	187
Diluted earnings per common share	$ 0.82	$ 0.78	$ 2.35	$ 2.23

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Derivative And Credit-Related Financial Instruments (Summary Of Internally Classified Watch List Letters Of Credit) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Total criticized standby and commercial letters of credit	$ 102	$ 69
As a percentage of total outstanding standby and commercial letters of credit	2.50%	1.60%

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Credit Quality And Allowance For Credit Losses (Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Nonaccrual loans	$ 329		$ 350
Reduced-rate loans	17	[1]	24	[1]
Total nonperforming loans	346		374
Foreclosed property	11		9
Total nonperforming assets	357		383
Business loans
Nonaccrual loans	255		262
Reduced-rate loans	0		4
Retail loans
Nonaccrual loans	74		88
Reduced-rate loans	$ 17		$ 20

[1] Reduced-rate business loans were zero at September 30, 2014 and $4 million at December 31, 2013, and reduced-rate retail loans were $17 million and $20 million at September 30, 2014 and December 31, 2013, respectively.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The Corporation utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The determination of fair values of financial instruments often requires the use of estimates. In cases where quoted market values in an active market are not available, the Corporation uses present value techniques and other valuation methods to estimate the fair values of its financial instruments. These valuation methods require considerable judgment and the resulting estimates of fair value can be significantly affected by the assumptions made and methods used.

Fair value is an estimate of the exchange price that would be received to sell an asset or paid to transfer a liability in an orderly transaction (i.e., not a forced transaction, such as a liquidation or distressed sale) between market participants at the measurement date. However, the calculated fair value estimates in many instances cannot be substantiated by comparison to independent markets and, in many cases, may not be realizable in a current sale of the financial instrument.

Trading securities, investment securities available-for-sale, derivatives and deferred compensation plan liabilities are recorded at fair value on a recurring basis. Additionally, from time to time, the Corporation may be required to record other assets and liabilities at fair value on a nonrecurring basis, such as impaired loans, other real estate (primarily foreclosed property), nonmarketable equity securities and certain other assets and liabilities. These nonrecurring fair value adjustments typically involve write-downs of individual assets or application of lower of cost or fair value accounting.

The Corporation categorizes assets and liabilities recorded at fair value on a recurring or nonrecurring basis and the estimated fair value of financial instruments not recorded at fair value on a recurring basis into a three-level hierarchy, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value.

Level 1	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.
Level 3	Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques.

The Corporation generally utilizes third-party pricing services to value Level 1 and Level 2 trading securities and investment securities available-for-sale, as well as certain derivatives designated as fair value hedges. Management reviews the methodologies and assumptions used by the third-party pricing services and evaluates the values provided, principally by comparison with other available market quotes for similar instruments and/or analysis based on internal models using available third-party market data. The Corporation may occasionally adjust certain values provided by the third-party pricing service when management believes, as the result of its review, that the adjusted price most appropriately reflects the fair value of the particular security.

Following are descriptions of the valuation methodologies and key inputs used to measure financial assets and liabilities recorded at fair value, as well as a description of the methods and significant assumptions used to estimate fair value disclosures for financial instruments not recorded at fair value in their entirety on a recurring basis. The descriptions include an indication of the level of the fair value hierarchy in which the assets or liabilities are classified. Transfers of assets or liabilities between levels of the fair value hierarchy are recognized at the beginning of the reporting period, when applicable.

Cash and due from banks, federal funds sold and interest-bearing deposits with banks

Due to their short-term nature, the carrying amount of these instruments approximates the estimated fair value. As such, the Corporation classifies the estimated fair value of these instruments as Level 1.

Trading securities and associated deferred compensation plan liabilities

Trading securities include securities held for trading purposes as well as assets held related to employee deferred compensation plans. Trading securities and associated deferred compensation plan liabilities are recorded at fair value on a recurring basis and included in “other short-term investments” and “accrued expenses and other liabilities,” respectively, on the consolidated balance sheets. Level 1 trading securities include assets related to employee deferred compensation plans, which are invested in mutual funds, U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and other securities traded on an active exchange, such as the New York Stock Exchange. Deferred compensation plan liabilities represent the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets. Level 2 trading securities include municipal bonds and residential mortgage-backed securities issued by U.S. government-sponsored entities and corporate debt securities. The methods used to value trading securities are the same as the methods used to value investment securities available-for-sale, discussed below.

Loans held-for-sale

Loans held-for-sale, included in “other short-term investments” on the consolidated balance sheets, are recorded at the lower of cost or fair value. Loans held-for-sale may be carried at fair value on a nonrecurring basis when fair value is less than cost. The fair value is based on what secondary markets are currently offering for portfolios with similar characteristics. As such, the Corporation classifies both loans held-for-sale subjected to nonrecurring fair value adjustments and the estimated fair value of loans held-for sale as Level 2.

Investment securities available-for-sale

Investment securities available-for-sale are recorded at fair value on a recurring basis. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and money market funds. Level 2 securities include residential mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored entities and corporate debt securities. The fair value of Level 2 securities was determined using quoted prices of securities with similar characteristics, or pricing models based on observable market data inputs, primarily interest rates, spreads and prepayment information.

Securities classified as Level 3 represent securities in less liquid markets requiring significant management assumptions when determining fair value. Auction-rate securities comprise Level 3 investment securities available-for-sale. Due to the lack of a robust secondary auction-rate securities market with active fair value indicators, fair value for all periods presented was determined using an income approach based on a discounted cash flow model. The discounted cash flow model utilizes two significant inputs: discount rate and workout period. The discount rate was calculated using credit spreads of the underlying collateral or similar securities plus a liquidity risk premium. The liquidity risk premium was derived from the rate at which various types of similar auction-rate securities had been redeemed or sold. The workout period was based on an assessment of publicly available information on efforts to re-establish functioning markets for these securities and the Corporation's own redemption experience. Significant increases in any of these inputs in isolation would result in a significantly lower fair value. The Corporate Development Department, with appropriate oversight and approval provided by senior management, is responsible for determining the valuation methodology for auction-rate securities and for updating significant inputs based on changes to the factors discussed above. Valuation results, including an analysis of changes to the valuation methodology and significant inputs, are provided to senior management for review on a quarterly basis.

Loans

The Corporation does not record loans at fair value on a recurring basis. However, the Corporation may establish a specific allowance for an impaired loan based on the fair value of the underlying collateral. Such loan values are reported as nonrecurring fair value measurements. Collateral values supporting individually evaluated impaired loans are evaluated quarterly. When management determines that the fair value of the collateral requires additional adjustments, either as a result of non-current appraisal value or when there is no observable market price, the Corporation classifies the impaired loan as Level 3. The Special Assets Group is responsible for performing quarterly credit quality reviews for all impaired loans as part of the quarterly allowance for loan losses process overseen by the Chief Credit Officer, during which valuation adjustments to updated collateral values are determined.

The Corporation discloses fair value estimates for loans. The estimated fair value is determined based on characteristics such as loan category, repricing features and remaining maturity, and includes prepayment and credit loss estimates. For variable rate business loans that reprice frequently, the estimated fair value is based on carrying values adjusted for estimated credit losses inherent in the portfolio at the balance sheet date. For other business loans and retail loans, fair values are estimated using a discounted cash flow model that employs a discount rate that reflects the Corporation's current pricing for loans with similar characteristics and remaining maturity, adjusted by an amount for estimated credit losses inherent in the portfolio at the balance sheet date. The rates take into account the expected yield curve, as well as an adjustment for prepayment risk, when applicable. The Corporation classifies the estimated fair value of loans held for investment as Level 3.

Customers’ liability on acceptances outstanding and acceptances outstanding

Customers' liability on acceptances outstanding is included in "accrued income and other assets" and acceptances outstanding are included in "accrued expenses and other liabilities" on the consolidated balance sheets. Due to their short-term nature, the carrying amount of these instruments approximates the estimated fair value. As such, the Corporation classifies the estimated fair value of these instruments as Level 1.

Derivative assets and derivative liabilities

Derivative instruments held or issued for risk management or customer-initiated activities are traded in over-the-counter markets where quoted market prices are not readily available. Fair value for over-the-counter derivative instruments is measured on a recurring basis using internally developed models that use primarily market observable inputs, such as yield curves and option volatilities. The Corporation manages credit risk on its derivative positions based on whether the derivatives are being settled through a clearinghouse or bilaterally with each counterparty. For derivative positions settled on a counterparty-by-counterparty basis, the Corporation calculates credit valuation adjustments, included in the fair value of these instruments, on the basis of its relationships at the counterparty portfolio/master netting agreement level. These credit valuation adjustments are determined by applying a credit spread for the counterparty or the Corporation, as appropriate, to the total expected exposure of the derivative after considering collateral and other master netting arrangements. These adjustments, which are considered Level 3 inputs, are based on estimates of current credit spreads to evaluate the likelihood of default. The Corporation assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Corporation classifies its over-the-counter derivative valuations in Level 2 of the fair value hierarchy. Examples of Level 2 derivative instruments are interest rate swaps and energy derivative and foreign exchange contracts.

Warrants which contain a net exercise provision or a non-contingent put right embedded in the warrant agreement are accounted for as derivatives and recorded at fair value on a recurring basis using a Black-Scholes valuation model. The Black-Scholes valuation model utilizes five inputs: risk-free rate, expected life, volatility, exercise price, and the per share market value of the underlying company. The Corporation holds a portfolio of warrants for generally nonmarketable equity securities with a fair value of $4 million at September 30, 2014, included in "accrued income and other assets" on the consolidated balance sheets. These warrants are primarily from non-public technology companies obtained as part of the loan origination process. The Corporate Development Department is responsible for the warrant valuation process, which includes reviewing all significant inputs for reasonableness, and for providing valuation results to senior management. Increases in any of these inputs in isolation, with the exception of exercise price, would result in a higher fair value. Increases in exercise price in isolation would result in a lower fair value. The Corporation classifies warrants accounted for as derivatives as Level 3.

The Corporation also holds a derivative contract associated with the 2008 sale of its remaining ownership of Visa Inc. (Visa) Class B shares. Under the terms of the derivative contract, the Corporation will compensate the counterparty primarily for dilutive adjustments made to the conversion factor of the Visa Class B to Class A shares based on the ultimate outcome of litigation involving Visa. Conversely, the Corporation will be compensated by the counterparty for any increase in the conversion factor from anti-dilutive adjustments. At September 30, 2014, the fair value of the contract was a liability of $3 million. The recurring fair value of the derivative contract is based on unobservable inputs consisting of management's estimate of the litigation outcome, timing of litigation settlements and payments related to the derivative. Significant increases in the estimate of litigation outcome and the timing of litigation settlements in isolation would result in a significantly higher liability fair value. Significant increases in payments related to the derivative in isolation would result in a significantly lower liability fair value. The Corporation classifies the derivative liability as Level 3.

Nonmarketable equity securities

The Corporation has a portfolio of indirect (through funds) private equity and venture capital investments with a carrying value and unfunded commitments of $12 million and $5 million, respectively, at September 30, 2014. These funds generally cannot be redeemed and the majority are not readily marketable. Distributions from these funds are received by the Corporation as a result of the liquidation of underlying investments of the funds and/or as income distributions. It is estimated that the underlying assets of the funds will be liquidated over a period of up to 15 years. Recently issued federal regulations may require the Corporation to sell certain of these funds prior to liquidation. The investments are accounted for either on the cost or equity method and are individually reviewed for impairment on a quarterly basis by comparing the carrying value to the estimated fair value. These investments may be carried at fair value on a nonrecurring basis when they are deemed to be impaired and written down to fair value. Where there is not a readily determinable fair value, the Corporation estimates fair value for indirect private equity and venture capital investments based on the net asset value, as reported by the fund, after indication that the fund adheres to applicable fair value measurement guidance. For those funds where the net asset value is not reported by the fund, the Corporation derives the fair value of the fund by estimating the fair value of each underlying investment in the fund. In addition to using qualitative information about each underlying investment, as provided by the fund, the Corporation gives consideration to information pertinent to the specific nature of the debt or equity investment, such as relevant market conditions, offering prices, operating results, financial conditions, exit strategy and other qualitative information, as available. The lack of an independent source to validate fair value estimates, including the impact of future capital calls and transfer restrictions, is an inherent limitation in the valuation process. On a quarterly basis, the Corporate Development Department is responsible, with appropriate oversight and approval provided by senior management, for performing the valuation procedures and updating significant inputs, as are primarily provided by the underlying fund's management. The Corporation classifies fair value measurements of nonmarketable equity securities as Level 3. Commitments to fund additional investments in nonmarketable equity securities recorded at fair value on a nonrecurring basis were not significant at September 30, 2014 or December 31, 2013.

The Corporation also holds restricted equity investments, primarily Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock. Restricted equity securities are not readily marketable and are recorded at cost (par value) in "accrued income and other assets" on the consolidated balance sheets and evaluated for impairment based on the ultimate recoverability of the par value. No significant observable market data for these instruments is available. The Corporation considers the profitability and asset quality of the issuer, dividend payment history and recent redemption experience when determining the ultimate recoverability of the par value. The Corporation’s investment in FHLB stock totaled $7 million and $48 million at September 30, 2014 and December 31, 2013, respectively, and its investment in FRB stock totaled $85 million at both September 30, 2014 and December 31, 2013. The Corporation believes its investments in FHLB and FRB stock are ultimately recoverable at par. Therefore, the carrying amount for these restricted equity investments approximates fair value. The Corporation classifies the estimated fair value of such investments as Level 1.

Other real estate

Other real estate is included in “accrued income and other assets” on the consolidated balance sheets and includes primarily foreclosed property. Foreclosed property is initially recorded at fair value, less costs to sell, at the date of foreclosure, establishing a new cost basis. Subsequently, foreclosed property is carried at the lower of cost or fair value, less costs to sell. Other real estate may be carried at fair value on a nonrecurring basis when fair value is less than cost. Fair value is based upon independent market prices, appraised value or management's estimate of the value of the property. The Special Assets Group obtains updated independent market prices and appraised values, as required by state regulation or deemed necessary based on market conditions, and determines if additional write-downs are necessary. On a quarterly basis, senior management reviews all other real estate and determines whether the carrying values are reasonable, based on the length of time elapsed since receipt of independent market price or appraised value and current market conditions. When management determines that the fair value of other real estate requires additional adjustments, either as a result of a non-current appraisal or when there is no observable market price, the Corporation classifies the other real estate as Level 3.

Deposit liabilities

The estimated fair value of checking, savings and certain money market deposit accounts is represented by the amounts payable on demand. The estimated fair value of term deposits is calculated by discounting the scheduled cash flows using the period-end rates offered on these instruments. As such, the Corporation classifies the estimated fair value of deposit liabilities as Level 2.

Short-term borrowings

The carrying amount of federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings approximates the estimated fair value. As such, the Corporation classifies the estimated fair value of short-term borrowings as Level 1.

Medium- and long-term debt

The carrying value of variable-rate FHLB advances approximates the estimated fair value. The estimated fair value of the Corporation's remaining variable- and fixed-rate medium- and long-term debt is based on quoted market values when available. If quoted market values are not available, the estimated fair value is based on the market values of debt with similar characteristics. The Corporation classifies the estimated fair value of medium- and long-term debt as Level 2.

Credit-related financial instruments

Credit-related financial instruments include unused commitments to extend credit and letters of credit. These instruments generate ongoing fees which are recognized over the term of the commitment. In situations where credit losses are probable, the Corporation records an allowance. The carrying value of these instruments included in "accrued expenses and other liabilities" on the consolidated balance sheets, which includes the carrying value of the deferred fees plus the related allowance, approximates the estimated fair value. The Corporation classifies the estimated fair value of credit-related financial instruments as Level 3.

ASSETS AND LIABLILITIES RECORDED AT FAIR VALUE ON A RECURRING BASIS

The following tables present the recorded amount of assets and liabilities measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013.

(in millions)	Total		Level 1		Level 2		Level 3
September 30, 2014
Trading securities:
Deferred compensation plan assets	$	97	$	97	$	—	$	—
Equity and other non-debt securities	2		2		—		—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	4		—		4		—
Corporate debt securities	1		—		1		—
Total trading securities	107		99		8		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	9,109		—		9,109		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	53		—		52		1		(b)
Equity and other non-debt securities	238		125		—		113		(b)
Total investment securities available-for-sale	9,468		170		9,161		137
Derivative assets:
Interest rate contracts	306		—		306		—
Energy derivative contracts	86		—		86		—
Foreign exchange contracts	28		—		28		—
Warrants	4		—		—		4
Total derivative assets	424		—		420		4
Total assets at fair value	$	9,999	$	269	$	9,589	$	141
Derivative liabilities:
Interest rate contracts	$	97	$	—	$	97	$	—
Energy derivative contracts	85		—		85		—
Foreign exchange contracts	28		—		28		—
Other	3		—		—		3
Total derivative liabilities	213		—		210		3
Deferred compensation plan liabilities	97		97		—		—
Total liabilities at fair value	$	310	$	97	$	210	$	3

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

(in millions)	Total		Level 1		Level 2		Level 3
December 31, 2013
Trading securities:
Deferred compensation plan assets	$	96	$	96	$	—	$	—
Equity and other non-debt securities	7		7		—		—
Residential mortgage-backed securities (a)	2		—		2		—
State and municipal securities	3		—		3		—
Total trading securities	108		103		5		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	8,926		—		8,926		—
State and municipal securities	22		—		—		22		(b)
Corporate debt securities	56		—		55		1		(b)
Equity and other non-debt securities	258		122		—		136		(b)
Total investment securities available-for-sale	9,307		167		8,981		159
Derivative assets:
Interest rate contracts	380		—		380		—
Energy derivative contracts	105		—		105		—
Foreign exchange contracts	15		—		15		—
Warrants	3		—		—		3
Total derivative assets	503		—		500		3
Total assets at fair value	$	9,918	$	270	$	9,486	$	162
Derivative liabilities:
Interest rate contracts	$	133	$	—	$	133	$	—
Energy derivative contracts	102		—		102		—
Foreign exchange contracts	14		—		14		—
Other	2		—		—		2
Total derivative liabilities	251		—		249		2
Deferred compensation plan liabilities	96		96		—		—
Total liabilities at fair value	$	347	$	96	$	249	$	2

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

There were no transfers of assets or liabilities recorded at fair value on a recurring basis into or out of Level 1, Level 2 and Level 3 fair value measurements during each of the three- and nine-month periods ended September 30, 2014 and 2013.

The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three- and nine-month periods ended September 30, 2014 and 2013.

			Net Realized/Unrealized Gains (Losses) (Pretax)
	Balance  at Beginning of Period		Recorded in Earnings							Recorded in Other Comprehensive Income										Balance  at End of  Period
(in millions)			Realized			Unrealized								Sales			Settlements
Three Months Ended September 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	118		1		(c)	—				1			(b)	(7		)	—			113
Total investment securities available-for-sale	142		1		(c)	—				1			(b)	(7		)	—			137
Derivative assets:
Warrants	4		2		(d)	—				—				(2		)	—			4
Derivative liabilities:
Other	2		—			(1		)	(c)	—				—			—			3
Three Months Ended September 30, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	25	$	—		$	—			$	—			$	—		$	—		$	25
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	146		1		(c)	—				5			(b)	(11		)	—			141
Total investment securities available-for-sale	172		1		(c)	—				5			(b)	(11		)	—			167
Derivative assets:
Warrants	3		7		(d)	—				—				(2		)	(6		)	2
Derivative liabilities:
Other	3		—			—				—				—			(1		)	2
Nine Months Ended September 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	22	$	—		$	—			$	1		(b)	$	—		$	—		$	23
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	136		2		(c)	—				7			(b)	(32		)	—			113
Total investment securities available-for-sale	159		2		(c)	—				8			(b)	(32		)	—			137
Derivative assets:
Warrants	3		6		(d)	1			(d)	—				(6		)	—			4
Derivative liabilities:
Other	2		—			(1		)	(c)	—				—			—			3
Nine Months Ended September 30, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—			$	2		(b)	$	—		$	—		$	25
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	156		1		(c)	—				(1		)	(b)	(15		)	—			141
Total investment securities available-for-sale	180		1		(c)	—				1			(b)	(15		)	—			167
Derivative assets:
Warrants	3		8		(d)	1			(d)	—				(4		)	(6		)	2
Derivative liabilities:
Other	1		—			(2		)	(c)	—				—			(1		)	2

(a) Auction-rate securities.

(b) Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income.

(c) Realized and unrealized gains and losses due to changes in fair value recorded in "net securities gains" on the consolidated statements of comprehensive income.

(d) Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income.

ASSETS AND LIABILITIES RECORDED AT FAIR VALUE ON A NONRECURRING BASIS

The Corporation may be required, from time to time, to record certain assets and liabilities at fair value on a nonrecurring basis. These include assets that are recorded at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. All assets recorded at fair value on a nonrecurring basis were classified as Level 3 at September 30, 2014 and December 31, 2013 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013.

(in millions)	Level 3
September 30, 2014
Loans:
Commercial	$	14
Real estate construction	14
Commercial mortgage	68
Total loans	96
Nonmarketable equity securities	1
Other real estate	1
Total assets at fair value	$	98
December 31, 2013
Loans:
Commercial	$	43
Real estate construction	20
Commercial mortgage	61
International	4
Total loans	128
Nonmarketable equity securities	2
Other real estate	5
Total assets at fair value	$	135

Level 3 assets recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013 included loans for which a specific allowance was established based on the fair value of collateral and other real estate for which fair value of the properties was less than the cost basis. For both asset classes, the unobservable inputs were the additional adjustments applied by management to the appraised values to reflect such factors as non-current appraisals and revisions to estimated time to sell. These adjustments are determined based on qualitative judgments made by management on a case-by-case basis and are not quantifiable inputs, although they are used in the determination of fair value.

The following table presents quantitative information related to the significant unobservable inputs utilized in the Corporation's Level 3 recurring fair value measurement as of September 30, 2014 and December 31, 2013. The Corporation's Level 3 recurring fair value measurements include auction-rate securities where fair value is determined using an income approach based on a discounted cash flow model. The inputs in the table below reflect management's expectation of continued illiquidity in the secondary auction-rate securities market due to a lack of market activity for the issuers remaining in the portfolio, a lack of market incentives for issuer redemptions, and the expectation for a continuing low interest rate environment. The September 30, 2014 workout periods reflect management's view that short-term interest rates could begin to rise in 2015.

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
September 30, 2014
State and municipal securities (a)	$	23	3% - 10%	1 - 3
Equity and other non-debt securities (a)	113		4% - 8%	1 - 2
December 31, 2013
State and municipal securities (a)	$	22	5% - 10%	3 - 4
Equity and other non-debt securities (a)	136		5% - 8%	2 - 3

(a) Auction-rate securities.

ESTIMATED FAIR VALUES OF FINANCIAL INSTRUMENTS NOT RECORDED AT FAIR VALUE ON A RECURRING BASIS

The Corporation typically holds the majority of its financial instruments until maturity and thus does not expect to realize many of the estimated fair value amounts disclosed. The disclosures also do not include estimated fair value amounts for items that are not defined as financial instruments, but which have significant value. These include such items as core deposit intangibles, the future earnings potential of significant customer relationships and the value of trust operations and other fee generating businesses. The Corporation believes the imprecision of an estimate could be significant.

The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis on the Corporation’s consolidated balance sheets are as follows:

	Carrying Amount			Estimated Fair Value
(in millions)				Total			Level 1		Level 2		Level 3
September 30, 2014
Assets
Cash and due from banks	$	1,039		$	1,039		$	1,039	$	—	$	—
Interest-bearing deposits with banks	6,748			6,748			6,748		—		—
Loans held-for-sale	5			5			—		5		—
Total loans, net of allowance for loan losses (a)	47,116			46,980			—		—		46,980
Customers’ liability on acceptances outstanding	15			15			15		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	27,490			27,490			—		27,490		—
Interest-bearing deposits	25,393			25,393			—		25,393		—
Customer certificates of deposit	4,698			4,686			—		4,686		—
Total deposits	57,581			57,569			—		57,569		—
Short-term borrowings	202			202			202		—		—
Acceptances outstanding	15			15			15		—		—
Medium- and long-term debt	2,669			2,696			—		2,696		—
Credit-related financial instruments	(91		)	(91		)	—		—		(91		)
December 31, 2013
Assets
Cash and due from banks	$	1,140		$	1,140		$	1,140	$	—	$	—
Interest-bearing deposits with banks	5,311			5,311			5,311		—		—
Loans held-for-sale	4			4			—		4		—
Total loans, net of allowance for loan losses (a)	44,872			44,801			—		—		44,801
Customers’ liability on acceptances outstanding	11			11			11		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	133			133			133		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,875			23,875			—		23,875		—
Interest-bearing deposits	24,354			24,354			—		24,354		—
Customer certificates of deposit	5,063			5,055			—		5,055		—
Total deposits	53,292			53,284			—		53,284		—
Short-term borrowings	253			253			253		—		—
Acceptances outstanding	11			11			11		—		—
Medium- and long-term debt	3,543			3,540			—		3,540		—
Credit-related financial instruments	(88		)	(88		)	—		—		(88		)

(a) Included $96 million and $128 million of impaired loans recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

(b) Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

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Variable Interest Entities (VIEs) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Variable Interest Entity [Line Items]
Unfunded commitments to fund tax credit entities	$ 131
Amount of financial or other support not contractually required provided by the Corporation to VIEs	0	0
Low Income Housing Tax Credit Entities
Variable Interest Entity [Line Items]
Exposure to loss as a result of involvement with VIEs	379
Other Tax Credit Entities
Variable Interest Entity [Line Items]
Exposure to loss as a result of involvement with VIEs	$ 10

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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Within one year, Amortized Cost	$ 131
After one year through five years, Amortized Cost	443
After five years through ten years, Amortized Cost	571
After ten years, Amortized Cost	8,108
Subtotal, Amortized Cost	9,253
Total investment securities available-for-sale, Amortized Cost	9,491	[1]	9,414	[1]
Within one year, Fair Value	132
After one year through five years, Fair Value	442
After five years through ten years, Fair Value	600
After ten years, Fair Value	8,056
Subtotal, Fair Value	9,230
Total investment securities available-for-sale, Fair Value	9,468	[1]	9,307	[1]
Equity and Other Non-Debt Securities
Total investment securities available-for-sale, Amortized Cost	238		266
Total investment securities available-for-sale, Fair Value	$ 238		$ 258

[1] Included auction-rate securities at amortized cost and fair value of $138 million and $137 million, respectively, as of September 30, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

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Net Income Per Common Share (Tables)

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Basic And Diluted Net Income Per Common Share

Basic and diluted net income per common share are presented in the following table.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share data)	2014		2013		2014		2013
Basic and diluted
Net income	$	154	$	147	$	444	$	424
Less:
Income allocated to participating securities	2		2		6		6
Net income attributable to common shares	$	152	$	145	$	438	$	418
Basic average common shares	179		182		179		184
Basic net income per common share	$	0.85	$	0.80	$	2.44	$	2.28
Basic average common shares	179		182		179		184
Dilutive common stock equivalents:
Net effect of assumed exercise of stock options	2		1		2		1
Net effect of the assumed exercise of warrants	4		4		5		2
Diluted average common shares	185		187		186		187
Diluted net income per common share	$	0.82	$	0.78	$	2.35	$	2.23

Schedule of Average Shares Excluded From Diluted Net Income Per Common Share Computation

The following average shares related to outstanding options to purchase shares of common stock were not included in the computation of diluted net income per common share because the prices of the options were greater than the average market price of common shares for the period.

	Three Months Ended September 30,		Nine Months Ended September 30,
(shares in millions)	2014	2013	2014	2013
Average outstanding options	6.0	8.2	7.3	11.8
Range of exercise prices	$50.87 - $60.82	$41.70 - $61.94	$48.17 - $61.94	$34.78 - $61.94

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Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2014

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule Of Accumulated Other Comprehensive Loss

The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the nine months ended September 30, 2014 and 2013, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Nine Months Ended September 30,
(in millions)	2014			2013
Accumulated net unrealized gains (losses) on investment securities available-for-sale:
Balance at beginning of period, net of tax	$	(68	)	$	150
Net unrealized holding gains (losses) arising during the period	85			(270		)
Less: Provision (benefit) for income taxes	30			(100		)
Net unrealized holding gains (losses) arising during the period, net of tax	55			(170		)
Less:
Net realized gains included in net securities gains	1			1
Less: Provision for income taxes	—			—
Reclassification adjustment for net securities gains included in net income, net of tax	1			1
Change in net unrealized gains (losses) on investment securities available-for-sale, net of tax	54			(171		)
Balance at end of period, net of tax	$	(14	)	$	(21	)
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(323	)	$	(563	)
Amortization of actuarial net loss	30			65
Amortization of prior service cost	1			2
Amounts recognized in salaries and benefits expense	31			67
Less: Provision for income taxes	11			24
Change in defined benefit pension and other postretirement plans adjustment, net of tax	20			43
Balance at end of period, net of tax	$	(303	)	$	(520	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(317	)	$	(541	)

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Derivative And Credit-Related Financial Instruments (Narrative) (Details) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Fair value of securities pledged as collateral for derivative assets	$ 124,000,000		$ 124,000,000
Cash deposited as collateral for derivative assets	12,000,000		12,000,000
Available-for-sale securities pledged as collateral for derivative liabilities	1,000,000		1,000,000
Cash posted as collateral for derivative liabilities	2,000,000		2,000,000
Aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	5,000,000		5,000,000
Collateral pledged for aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	1,000,000		1,000,000
Additional required overnight collateral on derivatives with credit-risk contingent features at period end should the credit-risk contingent features be triggered	4,000,000		4,000,000
Net interest income generated by risk management fair value interest rate swaps	18,000,000	18,000,000	54,000,000	54,000,000
Loss on interest rate fair value hedge ineffectiveness	1,000,000		1,000,000
Interest rate fair value hedge ineffectiveness		an insignificant amount		an insignificant amount
Gain open foreign currency positions	1,000,000		1,000,000
Gain (loss) on open foreign currency positions		an insignificant amount		an insignificant amount
Allowance for credit losses on lending-related commitments	43,000,000		43,000,000		36,000,000
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit	30,000,000		30,000,000		28,000,000
Risk participation agreements covering standby and commercial letters of credit	308,000,000		308,000,000		259,000,000
Standby and commercial letters of credit	4,000,000,000		4,000,000,000		4,400,000,000
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities	60,000,000		60,000,000		59,000,000
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities	47,000,000		47,000,000		51,000,000
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit	13,000,000		13,000,000		8,000,000
Notional Amount of Derivative Credit Risk Participation Agreements	527,000,000		527,000,000		614,000,000
Maximum estimated exposure to credit risk participation agreements assuming 100% default	5,000,000		5,000,000		7,000,000
Weighted average remaining maturity of credit risk participation agreements, in years			2 years 9 months 10 days
Fair value of derivative liability	210,000,000		210,000,000		249,000,000
Visa derivative contract
Notional amount of the derivative contract equivalent to Visa Class B shares	780		780
Fair value of derivative liability	$ 3,000,000		$ 3,000,000		$ 2,000,000

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Credit Quality And Allowance For Credit Losses (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Credit Quality And Allowance For Credit Losses [Abstract]
Commitments to lend additional funds to TDR borrowers	$ 1	$ 4
Allowance for PCI loans	$ 0	$ 0

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2014

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows.

Qualified Defined Benefit Pension Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Service cost	$	7		$	9		$	22		$	28
Interest cost	22			20			66			59
Expected return on plan assets	(33		)	(33		)	(99		)	(99		)
Amortization of prior service cost	1			1			4			3
Amortization of net loss	9			18			24			56
Net periodic defined benefit cost	$	6		$	15		$	17		$	47

Non-Qualified Defined Benefit Pension Plan	Three Months Ended September 30,					Nine Months Ended September 30,
(in millions)	2014			2013		2014			2013
Service cost	$	1		$	1	$	3		$	3
Interest cost	2			2		7			7
Amortization of prior service cost (credit)	(1		)	—		(3		)	(1		)
Amortization of net loss	2			3		5			8
Net periodic defined benefit cost	$	4		$	6	$	12		$	17

Postretirement Benefit Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Interest cost	$	—		$	1		$	2		$	3
Expected return on plan assets	(1		)	(1		)	(3		)	(3		)
Amortization of net loss	1			—			1			1
Net periodic postretirement benefit cost	$	—		$	—		$	—		$	1

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Business Segment Information (Tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Business Segment Financial Results

Business segment financial results are as follows:

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Nine Months Ended September 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	1,124		$	446		$	139		$	(485	)	$	19		$	1,243
Provision for credit losses	45			(2		)	(11		)	—			(7		)	25
Noninterest income	275			123			195			44			6			643
Noninterest expenses	441			524			239			(24		)	27			1,207
Provision (benefit) for income taxes (FTE)	311			16			38			(160		)	5			210
Net income (loss)	$	602		$	31		$	68		$	(257	)	$	—		$	444
Net credit-related charge-offs	$	16		$	7		$	1		$	—		$	—		$	24
Selected average balances:
Assets	$	37,094		$	6,074		$	4,981		$	11,070		$	6,117		$	65,336
Loans	36,124			5,406			4,797			—			—			46,327
Deposits	27,755			21,600			3,934			246			246			53,781
Statistical data:
Return on average assets (a)	2.17		%	0.19		%	1.81		%	N/M			N/M			0.91		%
Efficiency ratio (b)	31.56			91.81			71.95			N/M			N/M			63.99

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Nine Months Ended September 30, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	1,115		$	460		$	138		$	(492	)	$	23		$	1,244
Provision for credit losses	29			21			(8		)	—			(5		)	37
Noninterest income	287			132			191			47			6			663
Noninterest expenses	446			530			238			7			28			1,249
Provision (benefit) for income taxes (FTE)	312			14			35			(168		)	4			197
Net income (loss)	$	615		$	27		$	64		$	(284	)	$	2		$	424
Net credit-related charge-offs	$	37		$	18		$	5		$	—		$	—		$	60
Selected average balances:
Assets	$	35,694		$	5,967		$	4,785		$	11,553		$	5,708		$	63,707
Loans	34,626			5,278			4,629			—			—			44,533
Deposits	25,931			21,183			3,722			309			210			51,355
Statistical data:
Return on average assets (a)	2.30		%	0.17		%	1.78		%	N/M			N/M			0.89		%
Efficiency ratio (b)	31.78			89.19			72.64			N/M			N/M			65.45

(a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

(b)    Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

FTE – Fully Taxable Equivalent

N/M – not meaningful

Market Segment Financial Results

Market segment financial results are as follows:

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Nine Months Ended September 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	544		$	531		$	403		$	231		$	(466	)	$	1,243
Provision for credit losses	(13		)	39			32			(26		)	(7		)	25
Noninterest income	268			109			95			121			50			643
Noninterest expenses	487			299			274			144			3			1,207
Provision (benefit) for income taxes (FTE)	122			113			70			60			(155		)	210
Net income (loss)	$	216		$	189		$	122		$	174		$	(257	)	$	444
Net credit-related charge-offs (recoveries)	$	13		$	21		$	8		$	(18	)	$	—		$	24
Selected average balances:
Assets	$	13,797		$	15,543		$	11,525		$	7,284		$	17,187		$	65,336
Loans	13,400			15,259			10,829			6,839			—			46,327
Deposits	20,853			15,506			10,743			6,187			492			53,781
Statistical data:
Return on average assets (a)	1.32		%	1.52		%	1.36		%	3.19		%	N/M			0.91		%
Efficiency ratio (b)	59.87			46.74			55.02			41.12			N/M			63.99

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Nine Months Ended September 30, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	564		$	516		$	394		$	239		$	(469	)	$	1,244
Provision for credit losses	(16		)	22			31			5			(5		)	37
Noninterest income	268			113			100			129			53			663
Noninterest expenses	496			298			272			148			35			1,249
Provision (benefit) for income taxes (FTE)	125			115			67			54			(164		)	197
Net income (loss)	$	227		$	194		$	124		$	161		$	(282	)	$	424
Net credit-related charge-offs	$	10		$	30		$	7		$	13		$	—		$	60
Selected average balances:
Assets	$	13,936		$	14,072		$	10,774		$	7,664		$	17,261		$	63,707
Loans	13,508			13,826			10,064			7,135			—			44,533
Deposits	20,294			14,532			10,149			5,861			519			51,355
Statistical data:
Return on average assets (a)	1.42		%	1.66		%	1.46		%	2.80		%	N/M			0.89		%
Efficiency ratio (b)	59.52			47.39			54.96			40.22			N/M			65.45

(a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

(b)    Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

FTE – Fully Taxable Equivalent

N/M – not meaningful

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Basis of Presentation and Accounting Policies

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

Basis of Presentation and Accounting Policies

BASIS OF PRESENTATION AND ACCOUNTING POLICIES

Organization

The accompanying unaudited consolidated financial statements were prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation were included. The results of operations for the nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. Certain items in prior periods were reclassified to conform to the current presentation. For further information, refer to the consolidated financial statements and footnotes thereto included in the Annual Report of Comerica Incorporated and Subsidiaries (the Corporation) on Form 10-K for the year ended December 31, 2013.

Allowance for Credit Losses

In the second quarter 2014, the Corporation enhanced the approach used to determine the standard reserve factors used in estimating the allowance for credit losses, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly.

Recently Adopted Accounting Pronouncement

Effective January 1, 2014, the Corporation early adopted Accounting Standards Update (ASU) No. 2014-01, “Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects,” an amendment to GAAP which enables companies that invest in affordable housing projects that qualify for the low-income housing tax credit (LIHTC) to elect to use the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial investment cost of the project is amortized in proportion to the amount of tax credits and other benefits received, with the results of the investment presented on a net basis as a component of the provision for income taxes. Previously, LIHTC investments were accounted for under the cost or equity method, and the amortization was recorded as a reduction to other noninterest income, with the tax credits and other benefits received recorded as a component of the provision for income taxes. The Corporation believes the proportional amortization method better represents the economics of LIHTC investments and provides users with a better understanding of the returns from such investments than the cost or equity method.

The cumulative effect of the retrospective application of the change in amortization method was a $3 million decrease to both "accrued income and other assets" and "retained earnings" on the consolidated balance sheets as of January 1, 2013. The unaudited consolidated financial statements have been retrospectively adjusted to reflect the prior period effect of the adoption of the amendment, which resulted in increases of $14 million and $41 million to both "other noninterest income" and "provision for income taxes" for the three- and nine-month periods ended September 30, 2013, respectively. The adoption of ASU 2014-01 had no effect on net income or earnings per common share for any period presented.

See Note 6 to these unaudited consolidated financial statements for additional information regarding LIHTC and other tax credit investments.

Pending Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous GAAP comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2016, and must be retrospectively applied. Entities will have the option of presenting prior periods as impacted by the new guidance or presenting the cumulative effect of initial application along with supplementary disclosures. Early adoption is prohibited. The Corporation is currently evaluating the impact of adopting ASU 2014-09.

In June 2014, the FASB issued ASU No. 2014-12, “Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” (ASU 2014-12). The new guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. ASU 2014-12 is effective for annual and interim periods beginning after December 15, 2015, with early adoption permitted. The Corporation's current accounting treatment of performance conditions for employees who are or become retirement eligible prior to the achievement of the performance target are consistent with ASU 2014-12, and as such does not expect the new guidance to have a material effect on the Corporation’s financial condition and results of operations. The Corporation expects to prospectively adopt ASU 2014-12 in the first quarter 2015.

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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014 Restatement Adjustment [Member]	Sep. 30, 2013 Restatement Adjustment [Member]	Sep. 30, 2014 Restatement Adjustment [Member]	Sep. 30, 2013 Restatement Adjustment [Member]	Jan. 02, 2013 Restatement Adjustment [Member]	Sep. 30, 2014 Retained Earnings	Sep. 30, 2013 Retained Earnings	Dec. 31, 2013 Retained Earnings	Dec. 31, 2012 Retained Earnings	Jan. 02, 2013 Retained Earnings Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accrued income and other assets	$ (3,880)		$ (3,880)		$ (3,888)						$ 3
Decrease to retained earnings	(7,433)	(6,966)	(7,433)	(6,966)	(7,150)	(6,939)						(6,631)	(6,236)	(6,318)	(5,928)	3
Increase to other noninterest income	34	43	103	128				14		41
Increase to provision for income taxes	73	68	207	195				14		41
Impact on net income	$ 154	$ 147	$ 444	$ 424			$ 0	$ 0	$ 0	$ 0		$ 444	$ 424
Impact on basic net income per common share	$ 0.85	$ 0.80	$ 2.44	$ 2.28			$ 0.00	$ 0.00	$ 0.00	$ 0.00
Impact on diluted net income per common share	$ 0.82	$ 0.78	$ 2.35	$ 2.23			$ 0.00	$ 0.00	$ 0.00	$ 0.00

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Investment Securities (Summary Of Investment Securities Available-For-Sale) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Amortized Cost	$ 9,491	[1]	$ 9,414	[1]
Gross Unrealized Gains	107	[1]	92	[1]
Gross Unrealized Losses	130	[1]	199	[1]
Investment securities available-for-sale	9,468	[1]	9,307	[1]
U.S. Treasury and Other U.S. Government Agency Securities
Amortized Cost	45		45
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Investment securities available-for-sale	45		45
Residential Mortgage-Backed Securities
Amortized Cost	9,131	[2]	9,023	[2]
Gross Unrealized Gains	106	[2]	91	[2]
Gross Unrealized Losses	128	[2]	188	[2]
Investment securities available-for-sale	9,109	[2]	8,926	[2]
State And Municipal Securities
Amortized Cost	24		24
Gross Unrealized Gains	0		0
Gross Unrealized Losses	1		2
Investment securities available-for-sale	23		22
Corporate Debt Securities
Amortized Cost	53		56
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Investment securities available-for-sale	53		56
Equity and Other Non-Debt Securities
Amortized Cost	238		266
Gross Unrealized Gains	1		1
Gross Unrealized Losses	1		9
Investment securities available-for-sale	238		258
Auction-Rate Securities
Amortized Cost	138		169
Investment securities available-for-sale	$ 137		$ 159

[1] Included auction-rate securities at amortized cost and fair value of $138 million and $137 million, respectively, as of September 30, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

[2] Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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Credit Quality And Allowance For Credit Losses Credit Quality And Allowance For Credit Losses (Troubled Debt Restructuring Subsequent Default) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	$ 32		$ 81		$ 32		$ 81
Subsequent Default During Period	10		4		13		42
Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	3		4		3		4
Subsequent Default During Period	0		0		0		0
AB Note Restructures
Financing Receivable, Modifications [Line Items]
Balance			19				19
Subsequent Default During Period	0		0		0		0
Business loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	28		68		28		68
Subsequent Default During Period	10		4		13		42
Business loans | Commercial | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	13		13		13		13
Subsequent Default During Period	6		2		9		11
Business loans | Real estate construction | Commercial Real Estate business line | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	0	[1]	1	[1]	0	[1]	1	[1]
Subsequent Default During Period	0	[1]	0	[1]	0	[1]	0	[1]
Business loans | Commercial mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	14		54		14		54
Subsequent Default During Period	4		2		4		31
Business loans | Commercial mortgage | Commercial Real Estate business line | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	4	[1]	34	[1]	4	[1]	34	[1]
Subsequent Default During Period	0	[1]	0	[1]	0	[1]	20	[1]
Business loans | Commercial mortgage | Other business lines | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	10	[2]	20	[2]	10	[2]	20	[2]
Subsequent Default During Period	4	[2]	2	[2]	4	[2]	11	[2]
Business loans | International | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	1		0		1		0
Subsequent Default During Period	0		0		0		0
Retail loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	4		13		4		13
Subsequent Default During Period	0		0		0		0
Retail loans | Residential mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	2	[3]	3	[3]	2	[3]	3	[3]
Subsequent Default During Period	0		0		0		0
Retail loans | Consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	2		10		2		10
Subsequent Default During Period	0		0		0		0
Retail loans | Consumer | Home equity | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	2	[3]	7	[3]	2	[3]	7	[3]
Subsequent Default During Period	0		0		0		0
Retail loans | Consumer | Other consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	0		3	[3]	0		3	[3]
Subsequent Default During Period	$ 0		$ 0		$ 0		$ 0

[1] Primarily loans to real estate developers.

[2] Primarily loans secured by owner-occupied real estate.

[3] Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

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Business Segment Information (Narrative) (Details)	9 Months Ended
	Sep. 30, 2014 markets segments
Segment Reporting [Abstract]
Number of Major Business Segments	3
Number of Primary Market Segments	3

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Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
ASSETS
Cash and due from banks	$ 1,039		$ 1,140
Interest-bearing deposits with banks	6,748		5,311
Other short-term investments	112		112
Investment securities available-for-sale	9,468	[1]	9,307	[1]
Commercial loans	30,759		28,815
Real estate construction loans	1,992		1,762
Commercial mortgage loans	8,603		8,787
Lease financing	805		845
International loans	1,429		1,327
Residential mortgage loans	1,797		1,697
Consumer loans	2,323		2,237
Total loans	47,708		45,470
Less allowance for loan losses	(592)		(598)
Net loans	47,116		44,872
Premises and equipment	524		594
Accrued income and other assets	3,880		3,888
Total assets	68,887		65,224
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing deposits	27,490		23,875
Money market and interest-bearing checking deposits	23,523		22,332
Savings deposits	1,753		1,673
Customer certificates of deposit	4,698		5,063
Foreign office time deposits	117		349
Total interest-bearing deposits	30,091		29,417
Total deposits	57,581		53,292
Short-term borrowings	202		253
Accrued expenses and other liabilities	1,002		986
Medium- and long-term debt	2,669		3,543
Total liabilities	61,454		58,074
Common stock - $5 par value: Authorized - 325,000,000 shares; Issued - 228,164,824 shares	1,141		1,141
Capital surplus	2,183		2,179
Accumulated other comprehensive loss	(317)		(391)
Retained earnings	6,631		6,318
Less cost of common stock in treasury - 47,992,721 shares at 9/30/14 and 45,860,786 shares at 12/31/13	(2,205)		(2,097)
Total shareholders' equity	7,433		7,150
Total liabilities and shareholders' equity	$ 68,887		$ 65,224

[1] Included auction-rate securities at amortized cost and fair value of $138 million and $137 million, respectively, as of September 30, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

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Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	$ 57		$ 97
60-89 days past due and still accruing	71		30
90 days or more past due and still accruing	13		16
Total loans past due and still accruing	141		143
Nonaccrual loans	329		350
Current loans	47,238	[1]	44,977	[1]
Total loans	47,708		45,470
Carrying amount PCI loans	3		5
Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	42		72
60-89 days past due and still accruing	64		24
90 days or more past due and still accruing	12		11
Total loans past due and still accruing	118		107
Nonaccrual loans	255		262
Current loans	43,215	[1]	41,167	[1]
Total loans	43,588		41,536
Business loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	7		36
60-89 days past due and still accruing	57		17
90 days or more past due and still accruing	5		4
Total loans past due and still accruing	69		57
Nonaccrual loans	93		81
Current loans	30,597	[1]	28,677	[1]
Total loans	30,759		28,815
Business loans | Real estate construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0		0
60-89 days past due and still accruing	2		0
90 days or more past due and still accruing	0		0
Total loans past due and still accruing	2		0
Nonaccrual loans	18		21
Current loans	1,972	[1]	1,741	[1]
Total loans	1,992		1,762
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0	[2]	0	[2]
60-89 days past due and still accruing	2	[2]	0	[2]
90 days or more past due and still accruing	0	[2]	0	[2]
Total loans past due and still accruing	2	[2]	0	[2]
Nonaccrual loans	17	[2]	20	[2]
Current loans	1,664	[1],[2]	1,427	[1],[2]
Total loans	1,683	[2]	1,447	[2]
Business loans | Real estate construction | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0	[3]	0	[3]
60-89 days past due and still accruing	0	[3]	0	[3]
90 days or more past due and still accruing	0	[3]	0	[3]
Total loans past due and still accruing	0	[3]	0	[3]
Nonaccrual loans	1	[3]	1	[3]
Current loans	308	[1],[3]	314	[1],[3]
Total loans	309	[3]	315	[3]
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	33		36
60-89 days past due and still accruing	3		7
90 days or more past due and still accruing	7		4
Total loans past due and still accruing	43		47
Nonaccrual loans	144		156
Current loans	8,416	[1]	8,584	[1]
Total loans	8,603		8,787
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	4	[2]	9	[2]
60-89 days past due and still accruing	1	[2]	1	[2]
90 days or more past due and still accruing	0	[2]	0	[2]
Total loans past due and still accruing	5	[2]	10	[2]
Nonaccrual loans	49	[2]	51	[2]
Current loans	1,689	[1],[2]	1,617	[1],[2]
Total loans	1,743	[2]	1,678	[2]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	29	[3]	27	[3]
60-89 days past due and still accruing	2	[3]	6	[3]
90 days or more past due and still accruing	7	[3]	4	[3]
Total loans past due and still accruing	38	[3]	37	[3]
Nonaccrual loans	95	[3]	105	[3]
Current loans	6,727	[1],[3]	6,967	[1],[3]
Total loans	6,860	[3]	7,109	[3]
Business loans | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0		0
60-89 days past due and still accruing	0		0
90 days or more past due and still accruing	0		0
Total loans past due and still accruing	0		0
Nonaccrual loans	0		0
Current loans	805	[1]	845	[1]
Total loans	805		845
Business loans | International
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	2		0
60-89 days past due and still accruing	2		0
90 days or more past due and still accruing	0		3
Total loans past due and still accruing	4		3
Nonaccrual loans	0		4
Current loans	1,425	[1]	1,320	[1]
Total loans	1,429		1,327
Retail loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	15		25
60-89 days past due and still accruing	7		6
90 days or more past due and still accruing	1		5
Total loans past due and still accruing	23		36
Nonaccrual loans	74		88
Current loans	4,023	[1]	3,810	[1]
Total loans	4,120		3,934
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	9		15
60-89 days past due and still accruing	5		3
90 days or more past due and still accruing	0		0
Total loans past due and still accruing	14		18
Nonaccrual loans	42		53
Current loans	1,741	[1]	1,626	[1]
Total loans	1,797		1,697
Retail loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	6		10
60-89 days past due and still accruing	2		3
90 days or more past due and still accruing	1		5
Total loans past due and still accruing	9		18
Nonaccrual loans	32		35
Current loans	2,282	[1]	2,184	[1]
Total loans	2,323		2,237
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	5		6
60-89 days past due and still accruing	2		2
90 days or more past due and still accruing	1		0
Total loans past due and still accruing	8		8
Nonaccrual loans	31		33
Current loans	1,595	[1]	1,476	[1]
Total loans	1,634		1,517
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	1		4
60-89 days past due and still accruing	0		1
90 days or more past due and still accruing	0		5
Total loans past due and still accruing	1		10
Nonaccrual loans	1		2
Current loans	687	[1]	708	[1]
Total loans	$ 689		$ 720

[1] Included purchased credit-impaired (PCI) loans with a total carrying value of $3 million at September 30, 2014 and $5 million at December 31, 2013.

[2] Primarily loans to real estate developers.

[3] Primarily loans secured by owner-occupied real estate.

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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$ 0.20	$ 0.17	$ 0.59	$ 0.51

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Derivative And Credit-Related Financial Instruments (Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives) (Details) (Not Designated as Hedging Instrument, Customer-Initiated And Other Activities, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net derivative gain recognized in income	$ 13	$ 16	$ 41	$ 45
Interest Rate Contracts | Other Noninterest Income
Net derivative gain recognized in income	3	8	11	17
Energy Contracts | Other Noninterest Income
Net derivative gain recognized in income	1	0	1	2
Foreign Exchange Contracts | Foreign Exchange Income
Net derivative gain recognized in income	$ 9	$ 8	$ 29	$ 26

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Fair Value Measurements (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Warrants
Balance at beginning of period	$ 4		$ 3		$ 3		$ 3
Realized gains (losses) recorded in earnings	2	[1]	7	[1]	6	[1]	8	[1]
Unrealized gains (losses) recorded in earnings	0		0		1	[1]	1	[1]
Gains (losses) recorded in other comprehensive income	0		0		0		0
Sales	(2)		(2)		(6)		(4)
Settlements	0		(6)		0		(6)
Balance at end of period	4		2		4		2
Other Derivative Liabilities
Balance at beginnning of period	2		3		2		1
Realized gains (losses) recorded in earnings	0		0		0		0
Unrealized gains (losses) recorded in earnings	(1)	[2]	0		(1)	[2]	(2)	[2]
Gains (losses) recorded in other comprehensive income	0		0		0		0
Sales	0		0		0		0
Settlements	0		(1)		0		(1)
Balance at end of period	3		2		3		2
Investment Securities Available-For-Sale [Member]
Balance at beginning of period	142		172		159		180
Realized gains (losses) recorded in earnings	1	[2]	1	[2]	2	[2]	1	[2]
Unrealized gains (losses) recorded in earnings	0		0		0		0
Gains (losses) recorded in other comprehensive income	1	[3]	5	[3]	8	[3]	1	[3]
Sales	(7)		(11)		(32)		(15)
Settlements	0		0		0		0
Balance at end of period	137		167		137		167
State And Municipal Securities | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	23	[4]	25	[4]	22	[4]	23	[4]
Realized gains (losses) recorded in earnings	0	[4]	0	[4]	0	[4]	0	[4]
Unrealized gains (losses) recorded in earnings	0	[4]	0	[4]	0	[4]	0	[4]
Gains (losses) recorded in other comprehensive income	0	[4]	0	[4]	1	[3],[4]	2	[3],[4]
Sales	0	[4]	0	[4]	0	[4]	0	[4]
Settlements	0	[4]	0	[4]	0	[4]	0	[4]
Balance at end of period	23	[4]	25	[4]	23	[4]	25	[4]
Corporate Debt Securities | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	1	[4]	1	[4]	1	[4]	1	[4]
Realized gains (losses) recorded in earnings	0	[4]	0	[4]	0	[4]	0	[4]
Unrealized gains (losses) recorded in earnings	0	[4]	0	[4]	0	[4]	0	[4]
Gains (losses) recorded in other comprehensive income	0	[4]	0	[4]	0	[4]	0	[4]
Sales	0	[4]	0	[4]	0	[4]	0	[4]
Settlements	0	[4]	0	[4]	0	[4]	0	[4]
Balance at end of period	1	[4]	1	[4]	1	[4]	1	[4]
Equity and Other Non-Debt Securities | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	118	[4]	146	[4]	136	[4]	156	[4]
Realized gains (losses) recorded in earnings	1	[2],[4]	1	[2],[4]	2	[2],[4]	1	[2],[4]
Unrealized gains (losses) recorded in earnings	0	[4]	0	[4]	0	[4]	0	[4]
Gains (losses) recorded in other comprehensive income	1	[3],[4]	5	[3],[4]	7	[3],[4]	(1)	[3],[4]
Sales	(7)	[4]	(11)	[4]	(32)	[4]	(15)	[4]
Settlements	0	[4]	0	[4]	0	[4]	0	[4]
Balance at end of period	$ 113	[4]	$ 141	[4]	$ 113	[4]	$ 141	[4]

[1] Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income.

[2] Realized and unrealized gains and losses due to changes in fair value recorded in "net securities gains" on the consolidated statements of comprehensive income.

[3] Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income.

[4] Auction-rate securities.

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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified							9 Months Ended		12 Months Ended		9 Months Ended				9 Months Ended	12 Months Ended	9 Months Ended					12 Months Ended				12 Months Ended		9 Months Ended		12 Months Ended		9 Months Ended		12 Months Ended		9 Months Ended		12 Months Ended				9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Parent Company	Dec. 31, 2013 Parent Company	Sep. 30, 2014 Subsidiaries	Dec. 31, 2013 Subsidiaries	Sep. 30, 2014 4.80% subordinated notes due 2015 Parent Company		Dec. 31, 2013 4.80% subordinated notes due 2015 Parent Company		Sep. 30, 2014 3.80% subordinated notes due 2026 Parent Company		Dec. 31, 2013 3.80% subordinated notes due 2026 Parent Company		Sep. 30, 2014 3.00% notes due 2015 Parent Company	Dec. 31, 2013 3.00% notes due 2015 Parent Company	Sep. 30, 2014 2.125% notes due 2019 Parent Company		Jun. 30, 2014 2.125% notes due 2019 Parent Company	Dec. 31, 2013 2.125% notes due 2019 Parent Company		Dec. 31, 2013 5.70% subordinated notes due 2014 Subsidiaries		Sep. 30, 2014 5.70% subordinated notes due 2014 Subsidiaries		Dec. 31, 2013 8.375% subordinated notes called 2014 Subsidiaries	Sep. 30, 2014 8.375% subordinated notes called 2014 Subsidiaries	Sep. 30, 2014 5.75% subordinated notes due 2016 Subsidiaries		Dec. 31, 2013 5.75% subordinated notes due 2016 Subsidiaries		Sep. 30, 2014 5.20% subordinated notes due 2017 Subsidiaries		Dec. 31, 2013 5.20% subordinated notes due 2017 Subsidiaries		Sep. 30, 2014 7.875% subordinated notes due 2026 Subsidiaries		Dec. 31, 2013 7.875% subordinated notes due 2026 Subsidiaries		Dec. 31, 2013 Federal Home Loan Bank advances floating-rate based on LIBOR indices due 2014 Subsidiaries	Sep. 30, 2014 Federal Home Loan Bank advances floating-rate based on LIBOR indices due 2014 Subsidiaries	Sep. 30, 2014 6.0% - 6.4% fixed-rate notes due 2020 Subsidiaries	Dec. 31, 2013 6.0% - 6.4% fixed-rate notes due 2020 Subsidiaries
Debt Instruments [Line Items]
Subordinated notes					$ 1,444	$ 1,898	$ 308	[1]	$ 318	[1]	$ 249	[1]	$ 0	[1]								$ 255	[1]	$ 0	[1]	$ 183	$ 0	$ 672	[1]	$ 681	[1]	$ 551	[1]	$ 566	[1]	$ 221	[1]	$ 213	[1]
Medium-term notes															299	299	346	[1]		0	[1]
Federal Home Loan Bank advances																																								1,000	0
Other Notes																																										23	28
Total medium- and long-term debt	$ 2,669	$ 3,543	$ 1,202	$ 617	$ 1,467	$ 2,926
Stated interest rate							4.80%		4.80%		3.80%				3.00%	3.00%	2.125%		2.125%			5.70%				8.375%	8.375%	5.75%		5.75%		5.20%		5.20%		7.875%		7.875%
Fixed Interest Rate - minimum																																										6.00%	6.00%
Fixed Interest Rate - maximum																																										6.40%	6.40%
Maturity Date							May 01, 2015		May 01, 2015		Jul. 22, 2026				Sep. 16, 2015	Sep. 16, 2015	May 23, 2019					Jun. 01, 2014				Jul. 15, 2024		Nov. 21, 2016		Nov. 21, 2016		Aug. 22, 2017		Aug. 22, 2017		Sep. 15, 2026		Sep. 15, 2026		May 07, 2014		Jun. 30, 2020	Jun. 30, 2020
Earliest call date																										Jul. 15, 2014

[1] The carrying value of medium- and long-term debt has been adjusted to reflect the gain or loss attributable to the risk hedged with interest rate swaps.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Assets And Liabilities Recorded At Fair Value On A Recurring Basis

The following tables present the recorded amount of assets and liabilities measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013.

(in millions)	Total		Level 1		Level 2		Level 3
September 30, 2014
Trading securities:
Deferred compensation plan assets	$	97	$	97	$	—	$	—
Equity and other non-debt securities	2		2		—		—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	4		—		4		—
Corporate debt securities	1		—		1		—
Total trading securities	107		99		8		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	9,109		—		9,109		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	53		—		52		1		(b)
Equity and other non-debt securities	238		125		—		113		(b)
Total investment securities available-for-sale	9,468		170		9,161		137
Derivative assets:
Interest rate contracts	306		—		306		—
Energy derivative contracts	86		—		86		—
Foreign exchange contracts	28		—		28		—
Warrants	4		—		—		4
Total derivative assets	424		—		420		4
Total assets at fair value	$	9,999	$	269	$	9,589	$	141
Derivative liabilities:
Interest rate contracts	$	97	$	—	$	97	$	—
Energy derivative contracts	85		—		85		—
Foreign exchange contracts	28		—		28		—
Other	3		—		—		3
Total derivative liabilities	213		—		210		3
Deferred compensation plan liabilities	97		97		—		—
Total liabilities at fair value	$	310	$	97	$	210	$	3

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

(in millions)	Total		Level 1		Level 2		Level 3
December 31, 2013
Trading securities:
Deferred compensation plan assets	$	96	$	96	$	—	$	—
Equity and other non-debt securities	7		7		—		—
Residential mortgage-backed securities (a)	2		—		2		—
State and municipal securities	3		—		3		—
Total trading securities	108		103		5		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	8,926		—		8,926		—
State and municipal securities	22		—		—		22		(b)
Corporate debt securities	56		—		55		1		(b)
Equity and other non-debt securities	258		122		—		136		(b)
Total investment securities available-for-sale	9,307		167		8,981		159
Derivative assets:
Interest rate contracts	380		—		380		—
Energy derivative contracts	105		—		105		—
Foreign exchange contracts	15		—		15		—
Warrants	3		—		—		3
Total derivative assets	503		—		500		3
Total assets at fair value	$	9,918	$	270	$	9,486	$	162
Derivative liabilities:
Interest rate contracts	$	133	$	—	$	133	$	—
Energy derivative contracts	102		—		102		—
Foreign exchange contracts	14		—		14		—
Other	2		—		—		2
Total derivative liabilities	251		—		249		2
Deferred compensation plan liabilities	96		96		—		—
Total liabilities at fair value	$	347	$	96	$	249	$	2

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis

The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three- and nine-month periods ended September 30, 2014 and 2013.

			Net Realized/Unrealized Gains (Losses) (Pretax)
	Balance  at Beginning of Period		Recorded in Earnings							Recorded in Other Comprehensive Income										Balance  at End of  Period
(in millions)			Realized			Unrealized								Sales			Settlements
Three Months Ended September 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	118		1		(c)	—				1			(b)	(7		)	—			113
Total investment securities available-for-sale	142		1		(c)	—				1			(b)	(7		)	—			137
Derivative assets:
Warrants	4		2		(d)	—				—				(2		)	—			4
Derivative liabilities:
Other	2		—			(1		)	(c)	—				—			—			3
Three Months Ended September 30, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	25	$	—		$	—			$	—			$	—		$	—		$	25
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	146		1		(c)	—				5			(b)	(11		)	—			141
Total investment securities available-for-sale	172		1		(c)	—				5			(b)	(11		)	—			167
Derivative assets:
Warrants	3		7		(d)	—				—				(2		)	(6		)	2
Derivative liabilities:
Other	3		—			—				—				—			(1		)	2
Nine Months Ended September 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	22	$	—		$	—			$	1		(b)	$	—		$	—		$	23
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	136		2		(c)	—				7			(b)	(32		)	—			113
Total investment securities available-for-sale	159		2		(c)	—				8			(b)	(32		)	—			137
Derivative assets:
Warrants	3		6		(d)	1			(d)	—				(6		)	—			4
Derivative liabilities:
Other	2		—			(1		)	(c)	—				—			—			3
Nine Months Ended September 30, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—			$	2		(b)	$	—		$	—		$	25
Corporate debt securities (a)	1		—			—				—				—			—			1
Equity and other non-debt securities (a)	156		1		(c)	—				(1		)	(b)	(15		)	—			141
Total investment securities available-for-sale	180		1		(c)	—				1			(b)	(15		)	—			167
Derivative assets:
Warrants	3		8		(d)	1			(d)	—				(4		)	(6		)	2
Derivative liabilities:
Other	1		—			(2		)	(c)	—				—			(1		)	2

(a) Auction-rate securities.

(b) Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income.

(c) Realized and unrealized gains and losses due to changes in fair value recorded in "net securities gains" on the consolidated statements of comprehensive income.

(d) Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income.

Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis

All assets recorded at fair value on a nonrecurring basis were classified as Level 3 at September 30, 2014 and December 31, 2013 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013.

(in millions)	Level 3
September 30, 2014
Loans:
Commercial	$	14
Real estate construction	14
Commercial mortgage	68
Total loans	96
Nonmarketable equity securities	1
Other real estate	1
Total assets at fair value	$	98
December 31, 2013
Loans:
Commercial	$	43
Real estate construction	20
Commercial mortgage	61
International	4
Total loans	128
Nonmarketable equity securities	2
Other real estate	5
Total assets at fair value	$	135

Quantitative Information About Level 3 Measurements

The following table presents quantitative information related to the significant unobservable inputs utilized in the Corporation's Level 3 recurring fair value measurement as of September 30, 2014 and December 31, 2013. The Corporation's Level 3 recurring fair value measurements include auction-rate securities where fair value is determined using an income approach based on a discounted cash flow model. The inputs in the table below reflect management's expectation of continued illiquidity in the secondary auction-rate securities market due to a lack of market activity for the issuers remaining in the portfolio, a lack of market incentives for issuer redemptions, and the expectation for a continuing low interest rate environment. The September 30, 2014 workout periods reflect management's view that short-term interest rates could begin to rise in 2015.

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
September 30, 2014
State and municipal securities (a)	$	23	3% - 10%	1 - 3
Equity and other non-debt securities (a)	113		4% - 8%	1 - 2
December 31, 2013
State and municipal securities (a)	$	22	5% - 10%	3 - 4
Equity and other non-debt securities (a)	136		5% - 8%	2 - 3

(a) Auction-rate securities.

Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value In Their Entirety On A Recurring Basis

The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis on the Corporation’s consolidated balance sheets are as follows:

	Carrying Amount			Estimated Fair Value
(in millions)				Total			Level 1		Level 2		Level 3
September 30, 2014
Assets
Cash and due from banks	$	1,039		$	1,039		$	1,039	$	—	$	—
Interest-bearing deposits with banks	6,748			6,748			6,748		—		—
Loans held-for-sale	5			5			—		5		—
Total loans, net of allowance for loan losses (a)	47,116			46,980			—		—		46,980
Customers’ liability on acceptances outstanding	15			15			15		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	27,490			27,490			—		27,490		—
Interest-bearing deposits	25,393			25,393			—		25,393		—
Customer certificates of deposit	4,698			4,686			—		4,686		—
Total deposits	57,581			57,569			—		57,569		—
Short-term borrowings	202			202			202		—		—
Acceptances outstanding	15			15			15		—		—
Medium- and long-term debt	2,669			2,696			—		2,696		—
Credit-related financial instruments	(91		)	(91		)	—		—		(91		)
December 31, 2013
Assets
Cash and due from banks	$	1,140		$	1,140		$	1,140	$	—	$	—
Interest-bearing deposits with banks	5,311			5,311			5,311		—		—
Loans held-for-sale	4			4			—		4		—
Total loans, net of allowance for loan losses (a)	44,872			44,801			—		—		44,801
Customers’ liability on acceptances outstanding	11			11			11		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	133			133			133		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,875			23,875			—		23,875		—
Interest-bearing deposits	24,354			24,354			—		24,354		—
Customer certificates of deposit	5,063			5,055			—		5,055		—
Total deposits	53,292			53,284			—		53,284		—
Short-term borrowings	253			253			253		—		—
Acceptances outstanding	11			11			11		—		—
Medium- and long-term debt	3,543			3,540			—		3,540		—
Credit-related financial instruments	(88		)	(88		)	—		—		(88		)

(a) Included $96 million and $128 million of impaired loans recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

(b) Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

XML

Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) (Nonrecurring, Level 3, USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 96	$ 128
Nonmarketable equity securities	1	2
Other real estate	1	5
Total assets at fair value	98	135
Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14	43
Real estate construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14	20
Commercial mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	68	61
International
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		$ 4

XML

Credit Quality And Allowance For Credit Losses (Tables)

9 Months Ended

Sep. 30, 2014

Credit Quality And Allowance For Credit Losses [Abstract]

Aging Analysis Of Loans

The following table presents an aging analysis of the recorded balance of loans.

	Loans Past Due and Still Accruing
(in millions)	30-59 Days		60-89  Days		90 Days or More		Total		Nonaccrual Loans		Current Loans (c)		Total  Loans
September 30, 2014
Business loans:
Commercial	$	7	$	57	$	5	$	69	$	93	$	30,597	$	30,759
Real estate construction:
Commercial Real Estate business line (a)	—		2		—		2		17		1,664		1,683
Other business lines (b)	—		—		—		—		1		308		309
Total real estate construction	—		2		—		2		18		1,972		1,992
Commercial mortgage:
Commercial Real Estate business line (a)	4		1		—		5		49		1,689		1,743
Other business lines (b)	29		2		7		38		95		6,727		6,860
Total commercial mortgage	33		3		7		43		144		8,416		8,603
Lease financing	—		—		—		—		—		805		805
International	2		2		—		4		—		1,425		1,429
Total business loans	42		64		12		118		255		43,215		43,588
Retail loans:
Residential mortgage	9		5		—		14		42		1,741		1,797
Consumer:
Home equity	5		2		1		8		31		1,595		1,634
Other consumer	1		—		—		1		1		687		689
Total consumer	6		2		1		9		32		2,282		2,323
Total retail loans	15		7		1		23		74		4,023		4,120
Total loans	$	57	$	71	$	13	$	141	$	329	$	47,238	$	47,708
December 31, 2013
Business loans:
Commercial	$	36	$	17	$	4	$	57	$	81	$	28,677	$	28,815
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		20		1,427		1,447
Other business lines (b)	—		—		—		—		1		314		315
Total real estate construction	—		—		—		—		21		1,741		1,762
Commercial mortgage:
Commercial Real Estate business line (a)	9		1		—		10		51		1,617		1,678
Other business lines (b)	27		6		4		37		105		6,967		7,109
Total commercial mortgage	36		7		4		47		156		8,584		8,787
Lease financing	—		—		—		—		—		845		845
International	—		—		3		3		4		1,320		1,327
Total business loans	72		24		11		107		262		41,167		41,536
Retail loans:
Residential mortgage	15		3		—		18		53		1,626		1,697
Consumer:
Home equity	6		2		—		8		33		1,476		1,517
Other consumer	4		1		5		10		2		708		720
Total consumer	10		3		5		18		35		2,184		2,237
Total retail loans	25		6		5		36		88		3,810		3,934
Total loans	$	97	$	30	$	16	$	143	$	350	$	44,977	$	45,470

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Included purchased credit-impaired (PCI) loans with a total carrying value of $3 million at September 30, 2014 and $5 million at December 31, 2013.

Loans By Credit Quality Indicator

The following table presents loans by credit quality indicator, based on internal risk ratings assigned to each business loan at the time of approval and subjected to subsequent reviews, generally at least annually, and to pools of retail loans with similar risk characteristics.

	Internally Assigned Rating
(in millions)	Pass (a)		Special Mention (b)		Substandard (c)		Nonaccrual (d)		Total
September 30, 2014
Business loans:
Commercial	$	29,439	$	545	$	682	$	93	$	30,759
Real estate construction:
Commercial Real Estate business line (e)	1,654		12		—		17		1,683
Other business lines (f)	301		7		—		1		309
Total real estate construction	1,955		19		—		18		1,992
Commercial mortgage:
Commercial Real Estate business line (e)	1,590		75		29		49		1,743
Other business lines (f)	6,436		149		180		95		6,860
Total commercial mortgage	8,026		224		209		144		8,603
Lease financing	765		37		3		—		805
International	1,407		10		12		—		1,429
Total business loans	41,592		835		906		255		43,588
Retail loans:
Residential mortgage	1,746		4		5		42		1,797
Consumer:
Home equity	1,593		2		8		31		1,634
Other consumer	683		3		2		1		689
Total consumer	2,276		5		10		32		2,323
Total retail loans	4,022		9		15		74		4,120
Total loans	$	45,614	$	844	$	921	$	329	$	47,708
December 31, 2013
Business loans:
Commercial	$	27,470	$	590	$	674	$	81	$	28,815
Real estate construction:
Commercial Real Estate business line (e)	1,399		13		15		20		1,447
Other business lines (f)	314		—		—		1		315
Total real estate construction	1,713		13		15		21		1,762
Commercial mortgage:
Commercial Real Estate business line (e)	1,474		92		61		51		1,678
Other business lines (f)	6,596		145		263		105		7,109
Total commercial mortgage	8,070		237		324		156		8,787
Lease financing	841		3		1		—		845
International	1,298		7		18		4		1,327
Total business loans	39,392		850		1,032		262		41,536
Retail loans:
Residential mortgage	1,635		3		6		53		1,697
Consumer:
Home equity	1,475		4		5		33		1,517
Other consumer	708		3		7		2		720
Total consumer	2,183		7		12		35		2,237
Total retail loans	3,818		10		18		88		3,934
Total loans	$	43,210	$	860	$	1,050	$	350	$	45,470

(a) Includes all loans not included in the categories of special mention, substandard or nonaccrual.

(b) Special mention loans are accruing loans that have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date.

(c) Substandard loans are accruing loans that have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans also are distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. PCI loans are included in the substandard category. This category is generally consistent with the "substandard" category as defined by regulatory authorities.

(d) Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-58 in the Corporation's 2013 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.

(e) Primarily loans to real estate developers.

(f) Primarily loans secured by owner-occupied real estate.

Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property

The following table summarizes nonperforming assets.

(in millions)	September 30, 2014		December 31, 2013
Nonaccrual loans	$	329	$	350
Reduced-rate loans (a)	17		24
Total nonperforming loans	346		374
Foreclosed property	11		9
Total nonperforming assets	$	357	$	383

(a) Reduced-rate business loans were zero at September 30, 2014 and $4 million at December 31, 2013, and reduced-rate retail loans were $17 million and $20 million at September 30, 2014 and December 31, 2013, respectively.

Changes In The Allowance For Loan Losses And Related Loan Amounts

The following table details the changes in the allowance for loan losses and related loan amounts.

	2014									2013
(in millions)	Business Loans			Retail Loans			Total			Business Loans			Retail Loans			Total
Three Months Ended September 30
Allowance for loan losses:
Balance at beginning of period	$	528		$	63		$	591		$	542		$	71		$	613
Loan charge-offs	(20		)	(4		)	(24		)	(30		)	(9		)	(39		)
Recoveries on loans previously charged-off	19			2			21			18			2			20
Net loan charge-offs	(1		)	(2		)	(3		)	(12		)	(7		)	(19		)
Provision for loan losses	2			2			4			5			5			10
Balance at end of period	$	529		$	63		$	592		$	535		$	69		$	604
Nine Months Ended September 30
Allowance for loan losses:
Balance at beginning of period	$	531		$	67		$	598		$	552		$	77		$	629
Loan charge-offs	(71		)	(11		)	(82		)	(94		)	(18		)	(112		)
Recoveries on loans previously charged-off	50			8			58			45			7			52
Net loan charge-offs	(21		)	(3		)	(24		)	(49		)	(11		)	(60		)
Provision for loan losses	19			(1		)	18			32			3			35
Balance at end of period	$	529		$	63		$	592		$	535		$	69		$	604
As a percentage of total loans	1.21		%	1.52		%	1.24		%	1.32		%	1.83		%	1.37		%
September 30
Allowance for loan losses:
Individually evaluated for impairment	$	40		$	—		$	40		$	67		$	—		$	67
Collectively evaluated for impairment	489			63			552			468			69			537
Total allowance for loan losses	$	529		$	63		$	592		$	535		$	69		$	604
Loans:
Individually evaluated for impairment	$	204		$	44		$	248		$	294		$	52		$	346
Collectively evaluated for impairment	43,384			4,073			47,457			40,045			3,745			43,790
PCI loans (a)	—			3			3			10			5			15
Total loans evaluated for impairment	$	43,588		$	4,120		$	47,708		$	40,349		$	3,802		$	44,151

(a)    No allowance for loan losses was required for PCI loans at September 30, 2014 and 2013.

Changes In the Allowance For Credit Losses On Lending-Related Commitments

Changes in the allowance for credit losses on lending-related commitments, included in "accrued expenses and other liabilities" on the consolidated balance sheets, are summarized in the following table.

	Three Months Ended September 30,					Nine Months Ended September 30,
(in millions)	2014		2013			2014		2013
Balance at beginning of period	$	42	$	36		$	36	$	32
Provision for credit losses on lending-related commitments	1		(2		)	7		2
Balance at end of period	$	43	$	34		$	43	$	34

Individually Evaluated Impaired Loans

The following table presents additional information regarding individually evaluated impaired loans.

	Recorded Investment In:
(in millions)	Impaired Loans with No Related Allowance		Impaired Loans with Related Allowance		Total Impaired Loans		Unpaid Principal Balance		Related Allowance for Loan Losses
September 30, 2014
Business loans:
Commercial	$	4	$	82	$	86	$	124	$	19
Real estate construction:
Commercial Real Estate business line (a)	—		14		14		16		1
Other business lines (b)	—		1		1		1		—
Total real estate construction	—		15		15		17		1
Commercial mortgage:
Commercial Real Estate business line (a)	—		35		35		68		14
Other business lines (b)	2		65		67		91		6
Total commercial mortgage	2		100		102		159		20
International	1		—		1		1		—
Total business loans	7		197		204		301		40
Retail loans:
Residential mortgage	28		—		28		17		—
Consumer:
Home equity	12		—		12		16		—
Other consumer	4		—		4		5		—
Total consumer	16		—		16		21		—
Total retail loans (c)	44		—		44		38		—
Total individually evaluated impaired loans	$	51	$	197	$	248	$	339	$	40
December 31, 2013
Business loans:
Commercial	$	10	$	64	$	74	$	121	$	26
Real estate construction:
Commercial Real Estate business line (a)	—		20		20		24		3
Other business lines (b)	—		1		1		1		—
Total real estate construction	—		21		21		25		3
Commercial mortgage:
Commercial Real Estate business line (a)	—		60		60		104		12
Other business lines (b)	1		63		64		90		15
Total commercial mortgage	1		123		124		194		27
International	—		4		4		4		1
Total business loans	11		212		223		344		57
Retail loans:
Residential mortgage	35		—		35		42		—
Consumer:
Home equity	12		—		12		17		—
Other consumer	4		—		4		12		—
Total consumer	16		—		16		29		—
Total retail loans (c)	51		—		51		71		—
Total individually evaluated impaired loans	$	62	$	212	$	274	$	415	$	57

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy changes which resulted in direct write-downs of restructured retail loans.

Average Individually Evaluated Impaired Loans And Related Interest Recognized

The following table presents information regarding average individually evaluated impaired loans and the related interest recognized. Interest income recognized for the period primarily related to reduced-rate loans.

	Individually Evaluated Impaired Loans
	2014				2013
(in millions)	Average Balance for the Period		Interest Income Recognized for the Period		Average Balance for the Period		Interest Income Recognized for the Period
Three Months Ended September 30
Business loans:
Commercial	$	74	$	1	$	96	$	—
Real estate construction:
Commercial Real Estate business line (a)	16		—		24		—
Commercial mortgage:
Commercial Real Estate business line (a)	49		—		78		—
Other business lines (b)	70		—		106		1
Total commercial mortgage	119		—		184		1
International	1		—		—		—
Total business loans	210		1		304		1
Retail loans:
Residential mortgage	29		—		35		—
Consumer loans:
Home equity	11		—		8		—
Other consumer	4		—		4		—
Total consumer	15		—		12		—
Total retail loans	44		—		47		—
Total individually evaluated impaired loans	$	254	$	1	$	351	$	1
Nine Months Ended September 30
Business loans:
Commercial	$	68	$	1	$	105	$	2
Real estate construction:
Commercial Real Estate business line (a)	17		—		25		—
Other business lines (b)	1		—		—		—
Total real estate construction	18		—		25		—
Commercial mortgage:
Commercial Real Estate business line (a)	56		—		87		—
Other business lines (b)	68		2		114		2
Total commercial mortgage	124		2		201		2
Lease financing	—		—		1		—
International	2		—		—		—
Total business loans	212		3		332		4
Retail loans:
Residential mortgage	31		—		36		—
Consumer:
Home equity	12		—		7		—
Other consumer	4		—		4		—
Total consumer	16		—		11		—
Total retail loans	47		—		47		—
Total individually evaluated impaired loans	$	259	$	3	$	379	$	4

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

Troubled Debt Restructurings By Type Of Modification

The following tables detail the recorded balance at September 30, 2014 and 2013 of loans considered to be TDRs that were restructured during the three- and nine-month periods ended September 30, 2014 and 2013, by type of modification. In cases of loans with more than one type of modification, the loans were categorized based on the most significant modification.

	2014							2013
	Type of Modification							Type of Modification
(in millions)	Principal Deferrals (a)			Interest Rate Reductions		Total Modifications		Principal Deferrals (a)			Interest Rate Reductions		AB Note Restructures (b)		Total Modifications
Three Months Ended September 30
Business loans:
Commercial	$	2		$	—	$	2	$	3		$	—	$	—	$	3
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		14			—		—		14
Other business lines (d)	6			—		6		4			—		—		4
Total commercial mortgage	6			—		6		18			—		—		18
Total business loans	8			—		8		21			—		—		21
Retail loans:
Residential mortgage	—			—		—		—			1		—		1
Consumer:
Home equity	1		(e)	—		1		4		(e)	1		—		5
Other consumer	—			—		—		2		(e)	—		—		2
Total consumer	1			—		1		6			1		—		7
Total retail loans	1			—		1		6			2		—		8
Total loans	$	9		$	—	$	9	$	27		$	2	$	—	$	29
Nine Months Ended September 30
Business loans:
Commercial	$	3		$	—	$	3	$	13		$	—	$	8	$	21
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		33			—		—		33
Other business lines (d)	10			—		10		15			—		11		26
Total commercial mortgage	10			—		10		48			—		11		59
International	1			—		1		—			—		—		—
Total business loans	14			—		14		61			—		19		80
Retail loans:
Residential mortgage	—			—		—		1		(e)	2		—		3
Consumer:
Home equity	1		(e)	2		3		6		(e)	1		—		7
Other consumer	—			—		—		2		(e)	1		—		3
Total consumer	1			2		3		8			2		—		10
Total retail loans	1			2		3		9			4		—		13
Total loans	$	15		$	2	$	17	$	70		$	4	$	19	$	93

(a) Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates.

(b) Loan restructurings whereby the original loan is restructured into two notes: an "A" note, which generally reflects the portion of the modified loan which is expected to be collected; and a "B" note, which is either fully charged off or exchanged for an equity interest.

(c) Primarily loans to real estate developers.

(d) Primarily loans secured by owner-occupied real estate.

(e) Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

Troubled Debt Restructuring Subsequent Default

The following table presents information regarding the recorded balance at September 30, 2014 and 2013 of loans modified by principal deferral during the twelve months ended September 30, 2014 and 2013, and those principal deferrals which experienced a subsequent default during the three- and nine-month periods ended September 30, 2014 and 2013. For principal deferrals, incremental deterioration in the credit quality of the loan, represented by a downgrade in the risk rating of the loan, for example, due to missed interest payments or a reduction of collateral value, is considered a subsequent default.

	2014							2013
(in millions)	Balance at September 30			Subsequent Default in the Three Months Ended September 30		Subsequent Default in the Nine Months Ended September 30		Balance at September 30			Subsequent Default in the Three Months Ended September 30		Subsequent Default in the Nine Months Ended September 30
Principal deferrals:
Business loans:
Commercial	$	13		$	6	$	9	$	13		$	2	$	11
Real estate construction:
Commercial Real Estate business line (a)	—			—		—		1			—		—
Commercial mortgage:
Commercial Real Estate business line (a)	4			—		—		34			—		20
Other business lines (b)	10			4		4		20			2		11
Total commercial mortgage	14			4		4		54			2		31
International	1			—		—		—			—		—
Total business loans	28			10		13		68			4		42
Retail loans:
Residential mortgage	2		(c)	—		—		3		(c)	—		—
Consumer:
Home equity	2		(c)	—		—		7		(c)	—		—
Other consumer	—			—		—		3		(c)	—		—
Total consumer	2			—		—		10			—		—
Total retail loans	4			—		—		13			—		—
Total principal deferrals	$	32		$	10	$	13	$	81		$	4	$	42

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

During the twelve months ended September 30, 2014 and 2013, loans with a carrying value of $3 million and $4 million, respectively, were modified by interest rate reduction. During the twelve months ended September 30, 2013, loans with a carrying value of $19 million were restructured into two notes (AB note restructures). For reduced-rate loans and AB note restructures, a subsequent payment default is defined in terms of delinquency, when a principal or interest payment is 90 days past due. There were no subsequent payment defaults of reduced-rate loans or AB note restructures during the three- and nine-month periods ended September 30, 2014 and 2013.

Acquired Purchased Credit-Impaired Loans

The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at September 30, 2014 and December 31, 2013 were as follows.

(in millions)	September 30, 2014		December 31, 2013
Acquired PCI loans:
Carrying amount	$	3	$	5
Outstanding balance (principal and unpaid interest)	17		46

Accretable Yield For Acquired Purchased Credit-Impaired Loans

Changes in the accretable yield for acquired PCI loans for the three- and nine-month periods ended September 30, 2014 and 2013 were as follows.

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Balance at beginning of period	$	6		$	10		$	15		$	16
Reclassifications from nonaccretable	1			4			10			4
Accretion	(1		)	(3		)	(19		)	(9		)
Balance at end of period	$	6		$	11		$	6		$	11

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Net Income Per Common Share (Schedule of Average Shares Excluded From Diluted Net Income Per Common Share Computation) (Details) (Stock Options) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding options	6.0	8.2	7.3	11.8
Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	50.87	41.70	48.17	34.78
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	60.82	61.94	61.94	61.94

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Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES
Net income	$ 444	$ 424
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	25	37
Provision (benefit) for deferred income taxes	7	(6)
Depreciation and amortization	92	92
Net periodic defined benefit cost	29	65
Share-based compensation expense	31	27
Net amortization of securities	9	21
Accretion of loan purchase discount	(25)	(26)
Net securities losses	0	1
Net gains on sales of foreclosed property	(3)	(4)
Gain on debt redemption	(32)	(1)
Excess tax benefits from share-based compensation arrangements	(6)	(3)
Net change in trading securities	1	15
Net change in accrued income receivable	(2)	9
Net change in accrued expenses payable	(44)	(13)
Other, net	39	(228)
Net cash provided by operating activities	565	410
INVESTING ACTIVITIES
Maturities and redemptions of investment securities available-for-sale	1,328	2,418
Purchases of investment securities available-for-sale	(1,413)	(1,899)
Net change in loans	(2,254)	1,864
Proceeds from sales of foreclosed property	13	40
Net increase in premises and equipment	(38)	(70)
Sales of Federal Home Loan Bank stock	41	41
Other, net	(4)	10
Net cash (used in) provided by investing activities	(2,327)	2,404
FINANCING ACTIVITIES
Net change in deposits	4,205	999
Net change in short-term borrowings	(51)	116
Maturities and redemptions of medium- and long-term debt	(1,406)	(1,080)
Issuances of medium- and long-term debt	596	0
Repurchases of common stock	(200)	(218)
Cash dividends paid on common stock	(101)	(92)
Issuances of common stock under employee stock plans	45	22
Excess tax benefits from share-based compensation arrangements	6	3
Other, net	4	(10)
Net cash used in financing activities	3,098	(260)
Net increase in cash and cash equivalents	1,336	2,554
Cash and cash equivalents at beginning of period	6,451	4,534
Cash and cash equivalents at end of period	7,787	7,088
Interest paid	74	88
Income taxes and tax-related interest paid	154	104
Noncash investing and financing activities:
Loans transferred to other real estate	$ 13	$ 10

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Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Common stock, par value	$ 5	$ 5
Common stock, authorized shares	325,000,000	325,000,000
Common stock, issued shares	228,164,824	228,164,824
Shares in treasury	47,992,721	45,860,786

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2014

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Employee Benefit Plans

EMPLOYEE BENEFIT PLANS

Net periodic benefit costs are charged to "employee benefits expense" on the consolidated statements of comprehensive income. The components of net periodic benefit cost for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows.

Qualified Defined Benefit Pension Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Service cost	$	7		$	9		$	22		$	28
Interest cost	22			20			66			59
Expected return on plan assets	(33		)	(33		)	(99		)	(99		)
Amortization of prior service cost	1			1			4			3
Amortization of net loss	9			18			24			56
Net periodic defined benefit cost	$	6		$	15		$	17		$	47

Non-Qualified Defined Benefit Pension Plan	Three Months Ended September 30,					Nine Months Ended September 30,
(in millions)	2014			2013		2014			2013
Service cost	$	1		$	1	$	3		$	3
Interest cost	2			2		7			7
Amortization of prior service cost (credit)	(1		)	—		(3		)	(1		)
Amortization of net loss	2			3		5			8
Net periodic defined benefit cost	$	4		$	6	$	12		$	17

Postretirement Benefit Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Interest cost	$	—		$	1		$	2		$	3
Expected return on plan assets	(1		)	(1		)	(3		)	(3		)
Amortization of net loss	1			—			1			1
Net periodic postretirement benefit cost	$	—		$	—		$	—		$	1

For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2013 Annual Report.

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Document And Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 24, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2014
Amendment Flag	false
Entity Registrant Name	Comerica INC /NEW/
Entity Central Index Key	0000028412
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		179,686,578
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

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Income Taxes And Tax-Related Items

9 Months Ended

Sep. 30, 2014

Income Tax Disclosure [Abstract]

Income Taxes and Tax-Related Items

INCOME TAXES AND TAX-RELATED ITEMS

At September 30, 2014, net unrecognized tax benefits were $14 million, compared to $11 million at December 31, 2013. The increase in unrecognized tax benefits of $3 million was primarily the result of the recognition of federal audit adjustments. The Corporation anticipates that it is reasonably possible that final settlement of federal and state tax issues will result in a decrease in net unrecognized tax benefits of $9 million within the next twelve months. Included in "accrued expense and other liabilities" on the consolidated balance sheets was a $2 million liability for tax-related interest and penalties at both September 30, 2014 and December 31, 2013.

Net deferred tax assets were $200 million at September 30, 2014, compared to $256 million at December 31, 2013. The decrease of $56 million in net deferred tax assets resulted primarily from a decrease in unrealized losses on investment securities available-for-sale recognized in other comprehensive income. Deferred tax assets were evaluated for realization and it was determined that no valuation allowance was needed at both September 30, 2014 and December 31, 2013. This conclusion was based on available evidence of loss carryback capacity, projected future reversals of existing taxable temporary differences and assumptions made regarding future events.

In the ordinary course of business, the Corporation enters into certain transactions that have tax consequences. From time to time, the Internal Revenue Service (IRS) may review and/or challenge specific interpretive tax positions taken by the Corporation with respect to those transactions. The Corporation believes that its tax returns were filed based upon applicable statutes, regulations and case law in effect at the time of the transactions. The IRS, an administrative authority or a court, if presented with the transactions, could disagree with the Corporation’s interpretation of the tax law.

Based on current knowledge and probability assessment of various potential outcomes, the Corporation believes that current tax reserves are adequate, and the amount of any potential incremental liability arising is not expected to have a material adverse effect on the Corporation’s consolidated financial condition or results of operations. Probabilities and outcomes are reviewed as events unfold, and adjustments to the reserves are made when necessary.

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Consolidated Statements Of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
INTEREST INCOME
Interest and fees on loans	$ 381	$ 381	$ 1,142	$ 1,159
Interest on investment securities	52	54	160	159
Interest on short-term investments	3	4	9	10
Total interest income	436	439	1,311	1,328
INTEREST EXPENSE
Interest on deposits	11	13	33	43
Interest on medium- and long-term debt	11	14	38	43
Total interest expense	22	27	71	86
Net interest income	414	412	1,240	1,242
Provision for credit losses	5	8	25	37
Net interest income after provision for credit losses	409	404	1,215	1,205
NONINTEREST INCOME
Service charges on deposit accounts	54	53	162	161
Fiduciary income	44	41	133	128
Commercial lending fees	26	28	69	71
Card fees	20	20	59	55
Letter of credit fees	14	17	43	49
Bank-owned life insurance	11	12	31	31
Foreign exchange income	9	9	30	27
Brokerage fees	4	4	13	14
Net securities (losses) gains	(1)	1	0	(1)
Other noninterest income	34	43	103	128
Total noninterest income	215	228	643	663
NONINTEREST EXPENSES
Salaries and benefits expense	248	255	735	751
Net occupancy expense	46	41	125	119
Equipment expense	14	15	43	45
Outside processing fee expense	31	31	89	89
Software expense	25	22	72	66
Litigation-related expense	(2)	(4)	4	0
FDIC insurance expense	9	9	25	26
Advertising expense	5	6	16	18
Gain on debt redemption	(32)	0	(32)	(1)
Other noninterest expenses	53	42	130	136
Total noninterest expenses	397	417	1,207	1,249
Income before income taxes	227	215	651	619
Provision for income taxes	73	68	207	195
Net Income	154	147	444	424
Less income allocated to participating securities	2	2	6	6
Net income attributable to common shares	152	145	438	418
Basic earnings per common share	$ 0.85	$ 0.80	$ 2.44	$ 2.28
Diluted earnings per common share	$ 0.82	$ 0.78	$ 2.35	$ 2.23
Comprehensive income	141	144	518	296
Cash dividends declared on common stock	$ 36	$ 31	$ 107	$ 95
Cash dividends declared per common share	$ 0.20	$ 0.17	$ 0.59	$ 0.51

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Derivative And Credit-Related Financial Instruments

9 Months Ended

Sep. 30, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative And Credit-Related Financial Instruments

DERIVATIVE AND CREDIT-RELATED FINANCIAL INSTRUMENTS

In the normal course of business, the Corporation enters into various transactions involving derivative and credit-related financial instruments to manage exposure to fluctuations in interest rate, foreign currency and other market risks and to meet the financing needs of customers (customer-initiated derivatives). These financial instruments involve, to varying degrees, elements of market and credit risk. Market and credit risk are included in the determination of fair value.

Market risk is the potential loss that may result from movements in interest rates, foreign currency exchange rates or energy commodity prices that cause an unfavorable change in the value of a financial instrument. The Corporation manages this risk by establishing monetary exposure limits and monitoring compliance with those limits. Market risk inherent in interest rate and energy contracts entered into on behalf of customers is mitigated by taking offsetting positions, except in those circumstances when the amount, tenor and/or contract rate level results in negligible economic risk, whereby the cost of purchasing an offsetting contract is not economically justifiable. The Corporation mitigates most of the inherent market risk in foreign exchange contracts entered into on behalf of customers by taking offsetting positions and manages the remainder through individual foreign currency position limits and aggregate value-at-risk limits. These limits are established annually and reviewed quarterly. Market risk inherent in derivative instruments held or issued for risk management purposes is typically offset by changes in the fair value of the assets or liabilities being hedged.

Credit risk is the possible loss that may occur in the event of nonperformance by the counterparty to a financial instrument. The Corporation attempts to minimize credit risk arising from customer-initiated derivatives by evaluating the creditworthiness of each customer, adhering to the same credit approval process used for traditional lending activities and obtaining collateral as deemed necessary. Derivatives with dealer counterparties are either cleared through a clearinghouse or settled directly with a single counterparty. For derivatives settled directly with dealer counterparties, the Corporation utilizes counterparty risk limits and monitoring procedures as well as master netting arrangements and bilateral collateral agreements to facilitate the management of credit risk. Master netting arrangements effectively reduce credit risk by permitting settlement of positive and negative positions and offset cash collateral held with the same counterparty on a net basis. Bilateral collateral agreements require daily exchange of cash or highly rated securities issued by the U.S. Treasury or other U.S. government entities to collateralize amounts due to either party beyond certain risk limits. At September 30, 2014, counterparties with bilateral collateral agreements had pledged $124 million of marketable investment securities and deposited $12 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had pledged $1 million of investment securities and posted $2 million of cash as collateral for contracts in an unrealized loss position. For those counterparties not covered under bilateral collateral agreements, collateral is obtained, if deemed necessary, based on the results of management’s credit evaluation of the counterparty. Collateral varies, but may include cash, investment securities, accounts receivable, equipment or real estate. Included in the fair value of derivative instruments are credit valuation adjustments reflecting counterparty credit risk. These adjustments are determined by applying a credit spread for the counterparty or the Corporation, as appropriate, to the total expected exposure of the derivative.

The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position on September 30, 2014 was $5 million, for which the Corporation had pledged collateral of $1 million in the normal course of business. The credit-risk-related contingent features require the Corporation’s debt to maintain an investment grade credit rating from each of the major credit rating agencies. If the Corporation’s debt were to fall below investment grade, the counterparties to the derivative instruments could require additional overnight collateral on derivative instruments in net liability positions. If the credit-risk-related contingent features underlying these agreements had been triggered on September 30, 2014, the Corporation would have been required to assign an additional $4 million of collateral to its counterparties.

Derivative Instruments

Derivative instruments utilized by the Corporation are negotiated over-the-counter and primarily include swaps, caps and floors, forward contracts and options, each of which may relate to interest rates, energy commodity prices or foreign currency exchange rates. Swaps are agreements in which two parties periodically exchange cash payments based on specified indices applied to a specified notional amount until a stated maturity. Caps and floors are agreements which entitle the buyer to receive cash payments based on the difference between a specified reference rate or price and an agreed strike rate or price, applied to a specified notional amount until a stated maturity. Forward contracts are over-the-counter agreements to buy or sell an asset at a specified future date and price. Options are similar to forward contracts except the purchaser has the right, but not the obligation, to buy or sell the asset during a specified period or at a specified future date.

Over-the-counter contracts are tailored to meet the needs of the counterparties involved and, therefore, contain a greater degree of credit risk and liquidity risk than exchange-traded contracts, which have standardized terms and readily available price information. The Corporation reduces exposure to market and liquidity risks from over-the-counter derivative instruments entered into for risk management purposes, and transactions entered into to mitigate the market risk associated with customer-initiated transactions, by conducting hedging transactions with investment grade domestic and foreign financial institutions and subjecting counterparties to credit approvals, limits and collateral monitoring procedures similar to those used in making other extensions of credit. In addition, certain derivative contracts executed bilaterally with a dealer counterparty in the over-the-counter market are cleared through a clearinghouse, whereby the clearinghouse becomes the counterparty to the transaction.

The following table presents the composition of the Corporation’s derivative instruments held or issued for risk management purposes or in connection with customer-initiated and other activities at September 30, 2014 and December 31, 2013. The table excludes commitments, warrants accounted for as derivatives and a derivative related to the Corporation’s 2008 sale of its remaining ownership of Visa shares.

	September 30, 2014								December 31, 2013
			Fair Value								Fair Value
(in millions)	Notional/ Contract Amount (a)		Gross Derivative Assets			Gross Derivative Liabilities			Notional/ Contract Amount (a)		Gross Derivative Assets			Gross Derivative Liabilities
Risk management purposes
Derivatives designated as hedging instruments
Interest rate contracts:
Swaps - fair value - receive fixed/pay floating	$	1,800	$	164		$	2		$	1,450	$	198		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	426		1			4			253		1			—
Total risk management purposes	2,226		165			6			1,703		199			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	277		—			—			277		—			1
Caps and floors purchased	277		—			—			277		1			—
Swaps	11,403		142			95			11,143		181			132
Total interest rate contracts	11,957		142			95			11,697		182			133
Energy contracts:
Caps and floors written	1,349		3			40			1,325		1			48
Caps and floors purchased	1,349		40			3			1,325		48			1
Swaps	2,483		43			42			2,724		56			53
Total energy contracts	5,181		86			85			5,374		105			102
Foreign exchange contracts:
Spot, forwards, options and swaps	2,032		27			24			1,764		14			14
Total customer-initiated and other activities	19,170		255			204			18,835		301			249
Total gross derivatives	$	21,396	420			210			$	20,538	500			249
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(123		)	(123		)			(187		)	(187		)
Netting adjustment - Cash collateral received/posted			(11		)	—					(2		)	(10		)
Net derivatives included in the consolidated balance sheets (b)			286			87					311			52
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(121		)	(1		)			(138		)	(10		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	165		$	86				$	173		$	42

(a) Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

(b) Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $2 million at both September 30, 2014 and December 31, 2013.

Risk Management

As an end-user, the Corporation employs a variety of financial instruments for risk management purposes, including cash instruments, such as investment securities, as well as derivative instruments. Activity related to these instruments is centered predominantly in the interest rate markets and mainly involves interest rate swaps. Various other types of instruments also may be used to manage exposures to market risks, including interest rate caps and floors, total return swaps, foreign exchange forward contracts and foreign exchange swap agreements.

As part of a fair value hedging strategy, the Corporation entered into interest rate swap agreements for interest rate risk management purposes. These interest rate swap agreements effectively modify the Corporation’s exposure to interest rate risk by converting fixed-rate debt to a floating rate. These agreements involve the receipt of fixed-rate interest amounts in exchange for floating-rate interest payments over the life of the agreement, without an exchange of the underlying principal amount. Risk management fair value interest rate swaps generated net interest income of $18 million for both the three-month periods ended September 30, 2014 and 2013 and $54 million for both the nine-month periods ended September 30, 2014 and 2013. The Corporation recognized $1 million of net losses in "other noninterest income" in the consolidated statements of comprehensive income for the ineffective portion of risk management derivative instruments designated as fair value hedges of fixed-rate debt for each of the three- and nine-month periods ended September 30, 2014 and an insignificant amount for each of the three- and nine-month periods ended September 30, 2013.

Foreign exchange rate risk arises from changes in the value of certain assets and liabilities denominated in foreign currencies. The Corporation employs spot and forward contracts in addition to swap contracts to manage exposure to these and other risks. The Corporation recognized an insignificant amount of net gains on risk management derivative instruments used as economic hedges in "other noninterest income" in the consolidated statements of comprehensive income for each of the three- and nine-month periods ended September 30, 2014 and 2013.

The following table summarizes the expected weighted average remaining maturity of the notional amount of risk management interest rate swaps and the weighted average interest rates associated with amounts expected to be received or paid on interest rate swap agreements as of September 30, 2014 and December 31, 2013.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
September 30, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,800	4.8	4.54	%	0.49	%
December 31, 2013
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,450		3.4	5.45		0.38

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at September 30, 2014 and December 31, 2013.

Management believes these hedging strategies achieve the desired relationship between the rate maturities of assets and funding sources which, in turn, reduce the overall exposure of net interest income to interest rate risk, although there can be no assurance that such strategies will be successful.

Customer-Initiated and Other

The Corporation enters into derivative transactions at the request of customers and generally takes offsetting positions with dealer counterparties to mitigate the inherent market risk. Income primarily results from the spread between the customer derivative and the offsetting dealer position.

For customer-initiated foreign exchange contracts where offsetting positions have not been taken, the Corporation manages the remaining inherent market risk through individual foreign currency position limits and aggregate value-at-risk limits. These limits are established annually and reviewed quarterly. For those customer-initiated derivative contracts which were not offset or where the Corporation holds a speculative position within the limits described above, the Corporation recognized $1 million of net gains in “other noninterest income” in the consolidated statements of comprehensive income for each of the three- and nine-month periods ended September 30, 2014 and an insignificant amount for each of the three- and nine-month periods ended September 30, 2013.

Fair values of customer-initiated and other derivative instruments represent the net unrealized gains or losses on such contracts and are recorded in the consolidated balance sheets. Changes in fair value are recognized in the consolidated statements of comprehensive income. The net gains recognized in income on customer-initiated derivative instruments, net of the impact of offsetting positions, were as follows.

		Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	Location of Gain	2014		2013		2014		2013
Interest rate contracts	Other noninterest income	$	3	$	8	$	11	$	17
Energy contracts	Other noninterest income	1		—		1		2
Foreign exchange contracts	Foreign exchange income	9		8		29		26
Total		$	13	$	16	$	41	$	45

Credit-Related Financial Instruments

The Corporation issues off-balance sheet financial instruments in connection with commercial and consumer lending activities. The Corporation’s credit risk associated with these instruments is represented by the contractual amounts indicated in the following table.

(in millions)	September 30, 2014		December 31, 2013
Unused commitments to extend credit:
Commercial and other	$	28,158	$	27,728
Bankcard, revolving check credit and home equity loan commitments	2,138		1,889
Total unused commitments to extend credit	$	30,296	$	29,617
Standby letters of credit	$	3,942	$	4,297
Commercial letters of credit	65		103
Other credit-related financial instruments	3		2

The Corporation maintains an allowance to cover probable credit losses inherent in lending-related commitments, including unused commitments to extend credit, letters of credit and financial guarantees. At September 30, 2014 and December 31, 2013, the allowance for credit losses on lending-related commitments, included in “accrued expenses and other liabilities” on the consolidated balance sheets, was $43 million and $36 million, respectively.

Unused Commitments to Extend Credit

Commitments to extend credit are legally binding agreements to lend to a customer, provided there is no violation of any condition established in the contract. These commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Corporation. Commercial and other unused commitments are primarily variable rate commitments. The allowance for credit losses on lending-related commitments included $30 million and $28 million at September 30, 2014 and December 31, 2013, respectively, for probable credit losses inherent in the Corporation’s unused commitments to extend credit.

Standby and Commercial Letters of Credit

Standby letters of credit represent conditional obligations of the Corporation which guarantee the performance of a customer to a third party. Standby letters of credit are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing and similar transactions. Commercial letters of credit are issued to finance foreign or domestic trade transactions. These contracts expire in decreasing amounts through the year 2022. The Corporation may enter into participation arrangements with third parties that effectively reduce the maximum amount of future payments which may be required under standby and commercial letters of credit. These risk participations covered $308 million and $259 million, respectively, of the $4.0 billion and $4.4 billion standby and commercial letters of credit outstanding at September 30, 2014 and December 31, 2013, respectively.

The carrying value of the Corporation’s standby and commercial letters of credit, included in “accrued expenses and other liabilities” on the consolidated balance sheets, totaled $60 million at September 30, 2014, including $47 million in deferred fees and $13 million in the allowance for credit losses on lending-related commitments. At December 31, 2013, the comparable amounts were $59 million, $51 million and $8 million, respectively.

The following table presents a summary of criticized standby and commercial letters of credit at September 30, 2014 and December 31, 2013. The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines.

(dollar amounts in millions)	September 30, 2014			December 31, 2013
Total criticized standby and commercial letters of credit	$	102		$	69
As a percentage of total outstanding standby and commercial letters of credit	2.5		%	1.6		%

Other Credit-Related Financial Instruments

The Corporation enters into credit risk participation agreements, under which the Corporation assumes credit exposure associated with a borrower’s performance related to certain interest rate derivative contracts. The Corporation is not a party to the interest rate derivative contracts and only enters into these credit risk participation agreements in instances in which the Corporation is also a party to the related loan participation agreement for such borrowers. The Corporation manages its credit risk on the credit risk participation agreements by monitoring the creditworthiness of the borrowers, which is based on the normal credit review process had it entered into the derivative instruments directly with the borrower. The notional amount of such credit risk participation agreement reflects the pro-rata share of the derivative instrument, consistent with its share of the related participated loan. As of September 30, 2014 and December 31, 2013, the total notional amount of the credit risk participation agreements was approximately $527 million and $614 million, respectively, and the fair value, included in customer-initiated interest rate contracts recorded in "accrued expenses and other liabilities" on the consolidated balance sheets, was insignificant for each period. The maximum estimated exposure to these agreements, as measured by projecting a maximum value of the guaranteed derivative instruments, assuming 100 percent default by all obligors on the maximum values, was approximately $5 million and $7 million at September 30, 2014 and December 31, 2013, respectively. In the event of default, the lead bank has the ability to liquidate the assets of the borrower, in which case the lead bank would be required to return a percentage of the recouped assets to the participating banks. As of September 30, 2014, the weighted average remaining maturity of outstanding credit risk participation agreements was 2.8 years.

In 2008, the Corporation sold its remaining ownership of Visa Class B shares and entered into a derivative contract. Under the terms of the derivative contract, the Corporation will compensate the counterparty primarily for dilutive adjustments made to the conversion factor of the Visa Class B shares to Class A shares based on the ultimate outcome of litigation involving Visa. Conversely, the Corporation will be compensated by the counterparty for any increase in the conversion factor from anti-dilutive adjustments. The notional amount of the derivative contract was equivalent to approximately 780,000 Visa Class B shares. The fair value of the derivative liability, included in "accrued expenses and other liabilities" on the consolidated balance sheets, was $3 million and $2 million at September 30, 2014 and December 31, 2013, respectively.

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Credit Quality And Allowance For Credit Losses

9 Months Ended

Sep. 30, 2014

Credit Quality And Allowance For Credit Losses [Abstract]

Credit Quality And Allowance For Credit Losses

CREDIT QUALITY AND ALLOWANCE FOR CREDIT LOSSES

The following table presents an aging analysis of the recorded balance of loans.

	Loans Past Due and Still Accruing
(in millions)	30-59 Days		60-89  Days		90 Days or More		Total		Nonaccrual Loans		Current Loans (c)		Total  Loans
September 30, 2014
Business loans:
Commercial	$	7	$	57	$	5	$	69	$	93	$	30,597	$	30,759
Real estate construction:
Commercial Real Estate business line (a)	—		2		—		2		17		1,664		1,683
Other business lines (b)	—		—		—		—		1		308		309
Total real estate construction	—		2		—		2		18		1,972		1,992
Commercial mortgage:
Commercial Real Estate business line (a)	4		1		—		5		49		1,689		1,743
Other business lines (b)	29		2		7		38		95		6,727		6,860
Total commercial mortgage	33		3		7		43		144		8,416		8,603
Lease financing	—		—		—		—		—		805		805
International	2		2		—		4		—		1,425		1,429
Total business loans	42		64		12		118		255		43,215		43,588
Retail loans:
Residential mortgage	9		5		—		14		42		1,741		1,797
Consumer:
Home equity	5		2		1		8		31		1,595		1,634
Other consumer	1		—		—		1		1		687		689
Total consumer	6		2		1		9		32		2,282		2,323
Total retail loans	15		7		1		23		74		4,023		4,120
Total loans	$	57	$	71	$	13	$	141	$	329	$	47,238	$	47,708
December 31, 2013
Business loans:
Commercial	$	36	$	17	$	4	$	57	$	81	$	28,677	$	28,815
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		20		1,427		1,447
Other business lines (b)	—		—		—		—		1		314		315
Total real estate construction	—		—		—		—		21		1,741		1,762
Commercial mortgage:
Commercial Real Estate business line (a)	9		1		—		10		51		1,617		1,678
Other business lines (b)	27		6		4		37		105		6,967		7,109
Total commercial mortgage	36		7		4		47		156		8,584		8,787
Lease financing	—		—		—		—		—		845		845
International	—		—		3		3		4		1,320		1,327
Total business loans	72		24		11		107		262		41,167		41,536
Retail loans:
Residential mortgage	15		3		—		18		53		1,626		1,697
Consumer:
Home equity	6		2		—		8		33		1,476		1,517
Other consumer	4		1		5		10		2		708		720
Total consumer	10		3		5		18		35		2,184		2,237
Total retail loans	25		6		5		36		88		3,810		3,934
Total loans	$	97	$	30	$	16	$	143	$	350	$	44,977	$	45,470

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Included purchased credit-impaired (PCI) loans with a total carrying value of $3 million at September 30, 2014 and $5 million at December 31, 2013.

The following table presents loans by credit quality indicator, based on internal risk ratings assigned to each business loan at the time of approval and subjected to subsequent reviews, generally at least annually, and to pools of retail loans with similar risk characteristics.

	Internally Assigned Rating
(in millions)	Pass (a)		Special Mention (b)		Substandard (c)		Nonaccrual (d)		Total
September 30, 2014
Business loans:
Commercial	$	29,439	$	545	$	682	$	93	$	30,759
Real estate construction:
Commercial Real Estate business line (e)	1,654		12		—		17		1,683
Other business lines (f)	301		7		—		1		309
Total real estate construction	1,955		19		—		18		1,992
Commercial mortgage:
Commercial Real Estate business line (e)	1,590		75		29		49		1,743
Other business lines (f)	6,436		149		180		95		6,860
Total commercial mortgage	8,026		224		209		144		8,603
Lease financing	765		37		3		—		805
International	1,407		10		12		—		1,429
Total business loans	41,592		835		906		255		43,588
Retail loans:
Residential mortgage	1,746		4		5		42		1,797
Consumer:
Home equity	1,593		2		8		31		1,634
Other consumer	683		3		2		1		689
Total consumer	2,276		5		10		32		2,323
Total retail loans	4,022		9		15		74		4,120
Total loans	$	45,614	$	844	$	921	$	329	$	47,708
December 31, 2013
Business loans:
Commercial	$	27,470	$	590	$	674	$	81	$	28,815
Real estate construction:
Commercial Real Estate business line (e)	1,399		13		15		20		1,447
Other business lines (f)	314		—		—		1		315
Total real estate construction	1,713		13		15		21		1,762
Commercial mortgage:
Commercial Real Estate business line (e)	1,474		92		61		51		1,678
Other business lines (f)	6,596		145		263		105		7,109
Total commercial mortgage	8,070		237		324		156		8,787
Lease financing	841		3		1		—		845
International	1,298		7		18		4		1,327
Total business loans	39,392		850		1,032		262		41,536
Retail loans:
Residential mortgage	1,635		3		6		53		1,697
Consumer:
Home equity	1,475		4		5		33		1,517
Other consumer	708		3		7		2		720
Total consumer	2,183		7		12		35		2,237
Total retail loans	3,818		10		18		88		3,934
Total loans	$	43,210	$	860	$	1,050	$	350	$	45,470

(a) Includes all loans not included in the categories of special mention, substandard or nonaccrual.

(b) Special mention loans are accruing loans that have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date.

(c) Substandard loans are accruing loans that have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans also are distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. PCI loans are included in the substandard category. This category is generally consistent with the "substandard" category as defined by regulatory authorities.

(d) Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-58 in the Corporation's 2013 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.

(e) Primarily loans to real estate developers.

(f) Primarily loans secured by owner-occupied real estate.

The following table summarizes nonperforming assets.

(in millions)	September 30, 2014		December 31, 2013
Nonaccrual loans	$	329	$	350
Reduced-rate loans (a)	17		24
Total nonperforming loans	346		374
Foreclosed property	11		9
Total nonperforming assets	$	357	$	383

(a) Reduced-rate business loans were zero at September 30, 2014 and $4 million at December 31, 2013, and reduced-rate retail loans were $17 million and $20 million at September 30, 2014 and December 31, 2013, respectively.

Allowance for Credit Losses

The following table details the changes in the allowance for loan losses and related loan amounts.

	2014									2013
(in millions)	Business Loans			Retail Loans			Total			Business Loans			Retail Loans			Total
Three Months Ended September 30
Allowance for loan losses:
Balance at beginning of period	$	528		$	63		$	591		$	542		$	71		$	613
Loan charge-offs	(20		)	(4		)	(24		)	(30		)	(9		)	(39		)
Recoveries on loans previously charged-off	19			2			21			18			2			20
Net loan charge-offs	(1		)	(2		)	(3		)	(12		)	(7		)	(19		)
Provision for loan losses	2			2			4			5			5			10
Balance at end of period	$	529		$	63		$	592		$	535		$	69		$	604
Nine Months Ended September 30
Allowance for loan losses:
Balance at beginning of period	$	531		$	67		$	598		$	552		$	77		$	629
Loan charge-offs	(71		)	(11		)	(82		)	(94		)	(18		)	(112		)
Recoveries on loans previously charged-off	50			8			58			45			7			52
Net loan charge-offs	(21		)	(3		)	(24		)	(49		)	(11		)	(60		)
Provision for loan losses	19			(1		)	18			32			3			35
Balance at end of period	$	529		$	63		$	592		$	535		$	69		$	604
As a percentage of total loans	1.21		%	1.52		%	1.24		%	1.32		%	1.83		%	1.37		%
September 30
Allowance for loan losses:
Individually evaluated for impairment	$	40		$	—		$	40		$	67		$	—		$	67
Collectively evaluated for impairment	489			63			552			468			69			537
Total allowance for loan losses	$	529		$	63		$	592		$	535		$	69		$	604
Loans:
Individually evaluated for impairment	$	204		$	44		$	248		$	294		$	52		$	346
Collectively evaluated for impairment	43,384			4,073			47,457			40,045			3,745			43,790
PCI loans (a)	—			3			3			10			5			15
Total loans evaluated for impairment	$	43,588		$	4,120		$	47,708		$	40,349		$	3,802		$	44,151

(a)    No allowance for loan losses was required for PCI loans at September 30, 2014 and 2013.

Changes in the allowance for credit losses on lending-related commitments, included in "accrued expenses and other liabilities" on the consolidated balance sheets, are summarized in the following table.

	Three Months Ended September 30,					Nine Months Ended September 30,
(in millions)	2014		2013			2014		2013
Balance at beginning of period	$	42	$	36		$	36	$	32
Provision for credit losses on lending-related commitments	1		(2		)	7		2
Balance at end of period	$	43	$	34		$	43	$	34

Individually Evaluated Impaired Loans

The following table presents additional information regarding individually evaluated impaired loans.

	Recorded Investment In:
(in millions)	Impaired Loans with No Related Allowance		Impaired Loans with Related Allowance		Total Impaired Loans		Unpaid Principal Balance		Related Allowance for Loan Losses
September 30, 2014
Business loans:
Commercial	$	4	$	82	$	86	$	124	$	19
Real estate construction:
Commercial Real Estate business line (a)	—		14		14		16		1
Other business lines (b)	—		1		1		1		—
Total real estate construction	—		15		15		17		1
Commercial mortgage:
Commercial Real Estate business line (a)	—		35		35		68		14
Other business lines (b)	2		65		67		91		6
Total commercial mortgage	2		100		102		159		20
International	1		—		1		1		—
Total business loans	7		197		204		301		40
Retail loans:
Residential mortgage	28		—		28		17		—
Consumer:
Home equity	12		—		12		16		—
Other consumer	4		—		4		5		—
Total consumer	16		—		16		21		—
Total retail loans (c)	44		—		44		38		—
Total individually evaluated impaired loans	$	51	$	197	$	248	$	339	$	40
December 31, 2013
Business loans:
Commercial	$	10	$	64	$	74	$	121	$	26
Real estate construction:
Commercial Real Estate business line (a)	—		20		20		24		3
Other business lines (b)	—		1		1		1		—
Total real estate construction	—		21		21		25		3
Commercial mortgage:
Commercial Real Estate business line (a)	—		60		60		104		12
Other business lines (b)	1		63		64		90		15
Total commercial mortgage	1		123		124		194		27
International	—		4		4		4		1
Total business loans	11		212		223		344		57
Retail loans:
Residential mortgage	35		—		35		42		—
Consumer:
Home equity	12		—		12		17		—
Other consumer	4		—		4		12		—
Total consumer	16		—		16		29		—
Total retail loans (c)	51		—		51		71		—
Total individually evaluated impaired loans	$	62	$	212	$	274	$	415	$	57

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy changes which resulted in direct write-downs of restructured retail loans. 

The following table presents information regarding average individually evaluated impaired loans and the related interest recognized. Interest income recognized for the period primarily related to reduced-rate loans.

	Individually Evaluated Impaired Loans
	2014				2013
(in millions)	Average Balance for the Period		Interest Income Recognized for the Period		Average Balance for the Period		Interest Income Recognized for the Period
Three Months Ended September 30
Business loans:
Commercial	$	74	$	1	$	96	$	—
Real estate construction:
Commercial Real Estate business line (a)	16		—		24		—
Commercial mortgage:
Commercial Real Estate business line (a)	49		—		78		—
Other business lines (b)	70		—		106		1
Total commercial mortgage	119		—		184		1
International	1		—		—		—
Total business loans	210		1		304		1
Retail loans:
Residential mortgage	29		—		35		—
Consumer loans:
Home equity	11		—		8		—
Other consumer	4		—		4		—
Total consumer	15		—		12		—
Total retail loans	44		—		47		—
Total individually evaluated impaired loans	$	254	$	1	$	351	$	1
Nine Months Ended September 30
Business loans:
Commercial	$	68	$	1	$	105	$	2
Real estate construction:
Commercial Real Estate business line (a)	17		—		25		—
Other business lines (b)	1		—		—		—
Total real estate construction	18		—		25		—
Commercial mortgage:
Commercial Real Estate business line (a)	56		—		87		—
Other business lines (b)	68		2		114		2
Total commercial mortgage	124		2		201		2
Lease financing	—		—		1		—
International	2		—		—		—
Total business loans	212		3		332		4
Retail loans:
Residential mortgage	31		—		36		—
Consumer:
Home equity	12		—		7		—
Other consumer	4		—		4		—
Total consumer	16		—		11		—
Total retail loans	47		—		47		—
Total individually evaluated impaired loans	$	259	$	3	$	379	$	4

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

Troubled Debt Restructurings

The following tables detail the recorded balance at September 30, 2014 and 2013 of loans considered to be TDRs that were restructured during the three- and nine-month periods ended September 30, 2014 and 2013, by type of modification. In cases of loans with more than one type of modification, the loans were categorized based on the most significant modification.

	2014							2013
	Type of Modification							Type of Modification
(in millions)	Principal Deferrals (a)			Interest Rate Reductions		Total Modifications		Principal Deferrals (a)			Interest Rate Reductions		AB Note Restructures (b)		Total Modifications
Three Months Ended September 30
Business loans:
Commercial	$	2		$	—	$	2	$	3		$	—	$	—	$	3
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		14			—		—		14
Other business lines (d)	6			—		6		4			—		—		4
Total commercial mortgage	6			—		6		18			—		—		18
Total business loans	8			—		8		21			—		—		21
Retail loans:
Residential mortgage	—			—		—		—			1		—		1
Consumer:
Home equity	1		(e)	—		1		4		(e)	1		—		5
Other consumer	—			—		—		2		(e)	—		—		2
Total consumer	1			—		1		6			1		—		7
Total retail loans	1			—		1		6			2		—		8
Total loans	$	9		$	—	$	9	$	27		$	2	$	—	$	29
Nine Months Ended September 30
Business loans:
Commercial	$	3		$	—	$	3	$	13		$	—	$	8	$	21
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		33			—		—		33
Other business lines (d)	10			—		10		15			—		11		26
Total commercial mortgage	10			—		10		48			—		11		59
International	1			—		1		—			—		—		—
Total business loans	14			—		14		61			—		19		80
Retail loans:
Residential mortgage	—			—		—		1		(e)	2		—		3
Consumer:
Home equity	1		(e)	2		3		6		(e)	1		—		7
Other consumer	—			—		—		2		(e)	1		—		3
Total consumer	1			2		3		8			2		—		10
Total retail loans	1			2		3		9			4		—		13
Total loans	$	15		$	2	$	17	$	70		$	4	$	19	$	93

(a) Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates.

(b) Loan restructurings whereby the original loan is restructured into two notes: an "A" note, which generally reflects the portion of the modified loan which is expected to be collected; and a "B" note, which is either fully charged off or exchanged for an equity interest.

(c) Primarily loans to real estate developers.

(d) Primarily loans secured by owner-occupied real estate.

(e) Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

At September 30, 2014 and December 31, 2013, commitments to lend additional funds to borrowers whose terms have been modified in TDRs totaled $1 million and $4 million, respectively.

The majority of the modifications considered to be TDRs that occurred during the nine months ended September 30, 2014 and 2013 were principal deferrals. The Corporation charges interest on principal balances outstanding during deferral periods. Additionally, none of the modifications involved forgiveness of principal. As a result, the current and future financial effects of the recorded balance of loans considered to be TDRs that were restructured during the nine months ended September 30, 2014 and 2013 were insignificant.

On an ongoing basis, the Corporation monitors the performance of modified loans to their restructured terms. In the event of a subsequent default, the allowance for loan losses continues to be reassessed on the basis of an individual evaluation of the loan.

The following table presents information regarding the recorded balance at September 30, 2014 and 2013 of loans modified by principal deferral during the twelve months ended September 30, 2014 and 2013, and those principal deferrals which experienced a subsequent default during the three- and nine-month periods ended September 30, 2014 and 2013. For principal deferrals, incremental deterioration in the credit quality of the loan, represented by a downgrade in the risk rating of the loan, for example, due to missed interest payments or a reduction of collateral value, is considered a subsequent default.

	2014							2013
(in millions)	Balance at September 30			Subsequent Default in the Three Months Ended September 30		Subsequent Default in the Nine Months Ended September 30		Balance at September 30			Subsequent Default in the Three Months Ended September 30		Subsequent Default in the Nine Months Ended September 30
Principal deferrals:
Business loans:
Commercial	$	13		$	6	$	9	$	13		$	2	$	11
Real estate construction:
Commercial Real Estate business line (a)	—			—		—		1			—		—
Commercial mortgage:
Commercial Real Estate business line (a)	4			—		—		34			—		20
Other business lines (b)	10			4		4		20			2		11
Total commercial mortgage	14			4		4		54			2		31
International	1			—		—		—			—		—
Total business loans	28			10		13		68			4		42
Retail loans:
Residential mortgage	2		(c)	—		—		3		(c)	—		—
Consumer:
Home equity	2		(c)	—		—		7		(c)	—		—
Other consumer	—			—		—		3		(c)	—		—
Total consumer	2			—		—		10			—		—
Total retail loans	4			—		—		13			—		—
Total principal deferrals	$	32		$	10	$	13	$	81		$	4	$	42

(a) Primarily loans to real estate developers.

(b) Primarily loans secured by owner-occupied real estate.

(c) Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

During the twelve months ended September 30, 2014 and 2013, loans with a carrying value of $3 million and $4 million, respectively, were modified by interest rate reduction. During the twelve months ended September 30, 2013, loans with a carrying value of $19 million were restructured into two notes (AB note restructures). For reduced-rate loans and AB note restructures, a subsequent payment default is defined in terms of delinquency, when a principal or interest payment is 90 days past due. There were no subsequent payment defaults of reduced-rate loans or AB note restructures during the three- and nine-month periods ended September 30, 2014 and 2013.

Purchased Credit-Impaired Loans

Acquired loans are initially recorded at fair value with no carryover of any allowance for loan losses. Loans acquired with evidence of credit quality deterioration at acquisition for which it was probable that the Corporation would not be able to collect all contractual amounts due were accounted for as PCI loans. The Corporation aggregated the acquired PCI loans into pools of loans based on common risk characteristics.

No allowance for loan losses was required on the acquired PCI loan pools at both September 30, 2014 and December 31, 2013. The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at September 30, 2014 and December 31, 2013 were as follows.

(in millions)	September 30, 2014		December 31, 2013
Acquired PCI loans:
Carrying amount	$	3	$	5
Outstanding balance (principal and unpaid interest)	17		46

Changes in the accretable yield for acquired PCI loans for the three- and nine-month periods ended September 30, 2014 and 2013 were as follows.

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Balance at beginning of period	$	6		$	10		$	15		$	16
Reclassifications from nonaccretable	1			4			10			4
Accretion	(1		)	(3		)	(19		)	(9		)
Balance at end of period	$	6		$	11		$	6		$	11

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Investment Securities (Tables)

9 Months Ended

Sep. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Summary Of Investment Securities Available-For-Sale

A summary of the Corporation’s investment securities available-for-sale follows:

(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
September 30, 2014
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,131		106		128		9,109
State and municipal securities	24		—		1		23
Corporate debt securities	53		—		—		53
Equity and other non-debt securities	238		1		1		238
Total investment securities available-for-sale (b)	$	9,491	$	107	$	130	$	9,468
December 31, 2013
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,023		91		188		8,926
State and municipal securities	24		—		2		22
Corporate debt securities	56		—		—		56
Equity and other non-debt securities	266		1		9		258
Total investment securities available-for-sale (b)	$	9,414	$	92	$	199	$	9,307

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Included auction-rate securities at amortized cost and fair value of $138 million and $137 million, respectively, as of September 30, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

Summary Of Investment Securities Available-For-Sale In Unrealized Loss Positions

A summary of the Corporation’s investment securities available-for-sale in an unrealized loss position as of September 30, 2014 and December 31, 2013 follows:

	Temporarily Impaired
	Less than 12 Months				12 Months or more					Total
(in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
September 30, 2014
Residential mortgage-backed securities (a)	$	1,434	$	11	$	3,519	$	117		$	4,953	$	128
State and municipal securities (b)	—		—		23		1			23		1
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		113		1			113		1
Total impaired securities	$	1,434	$	11	$	3,656	$	119		$	5,090	$	130
December 31, 2013
Residential mortgage-backed securities (a)	$	5,825	$	187	$	11	$	1		$	5,836	$	188
State and municipal securities (b)	—		—		22		2			22		2
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		148		9			148		9
Total impaired securities	$	5,825	$	187	$	182	$	12		$	6,007	$	199

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

(c) Unrealized losses less than $0.5 million.

Summary of Net Securities Gains (Losses)

Sales, calls and write-downs of investment securities available-for-sale resulted in the following gains and losses recorded in “net securities (losses) gains” on the consolidated statements of comprehensive income, computed based on the adjusted cost of the specific security.

	Nine Months Ended September 30,
(in millions)	2014			2013
Securities gains	$	1		$	1
Securities losses (a)	(1		)	(2		)
Net securities (losses) gains	$	—		$	(1	)

(a) Primarily charges related to a derivative contract tied to the conversion rate of Visa Class B shares.

Contractual Maturity Distribution Of Debt Securities

The following table summarizes the amortized cost and fair values of debt securities by contractual maturity. Securities with multiple maturity dates are classified in the period of final maturity. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(in millions)
September 30, 2014	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	131	$	132
After one year through five years	443		442
After five years through ten years	571		600
After ten years	8,108		8,056
Subtotal	9,253		9,230
Equity and other non-debt securities	238		238
Total investment securities available-for-sale	$	9,491	$	9,468

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Contingent Liabilities

9 Months Ended

Sep. 30, 2014

Commitments and Contingencies Disclosure [Abstract]

Contingent Liabilities

CONTINGENT LIABILITIES

Legal Proceedings

As previously reported in the Corporation's Form 10-K for the year ended December 31, 2013 and Forms 10-Q for the quarterly periods ended March 31, 2014 and June 30, 2014, Comerica Bank, a wholly owned subsidiary of the Corporation, was sued in November 2011 as a third-party defendant in Butte Local Development v. Masters Group v. Comerica Bank (“the case”), for lender liability. The case was tried in January 2014, in the Montana Second District Judicial Court for Silver Bow County in Butte, Montana ("the court"). On January 17, 2014, a jury awarded Masters $52 million against the Bank. Following the jury’s decision on the case, the Corporation increased its reserve for litigation-related expense, effective as of December 31, 2013, to $52 million. The Corporation increased its reserve related to the case to $54 million in March 2014, to include additional attorney's fees and costs awarded by the court.

The Corporation believes that it has meritorious defenses and appellate issues for this litigation and has appealed to the Montana Supreme Court, the sole appellate court for the state of Montana. The Montana Supreme Court heard oral arguments in September 2014 and will be rendering a written decision on the appeal.

The Corporation and certain of its subsidiaries are subject to various other pending or threatened legal proceedings arising out of the normal course of business or operations. The Corporation believes it has meritorious defenses to the claims asserted against it in its other currently outstanding legal proceedings and, with respect to such legal proceedings, intends to continue to defend itself vigorously, litigating or settling cases according to management’s judgment as to what is in the best interests of the Corporation and its shareholders. Settlement may result from the Corporation's determination that it may be more prudent financially to settle, rather than litigate, and should not be regarded as an admission of liability. On at least a quarterly basis, the Corporation assesses its potential liabilities and contingencies in connection with outstanding legal proceedings utilizing the latest information available. On a case-by-case basis, reserves are established for those legal claims for which it is probable that a loss will be incurred either as a result of a settlement or judgment, and the amount of such loss can be reasonably estimated. The actual costs of resolving these claims may be substantially higher or lower than the amounts reserved. Based on current knowledge, and after consultation with legal counsel, management believes that current reserves are adequate, and the amount of any incremental liability arising from these matters is not expected to have a material adverse effect on the Corporation’s consolidated financial condition, consolidated results of operations or consolidated cash flows. Legal fees of $8 million and $5 million were included in "other noninterest expenses" on the consolidated statements of income for the three-month periods ended September 30, 2014 and 2013, respectively, and $18 million and $19 million for the nine-month periods ended September 30, 2014 and 2013, respectively. For matters where a loss is not probable, the Corporation has not established legal reserves. The Corporation believes the estimate of the aggregate range of reasonably possible losses, in excess of reserves established, for all legal proceedings in which it is involved is from zero to approximately $44 million at September 30, 2014. This estimated aggregate range of reasonably possible losses is based upon currently available information for those proceedings in which the Corporation is involved, taking into account the Corporation’s best estimate of such losses for those cases for which such estimate can be made. For certain cases, the Corporation does not believe that an estimate can currently be made. The Corporation’s estimate involves significant judgment, given the varying stages of the proceedings (including the fact that many are currently in preliminary stages), the existence in certain proceedings of multiple defendants (including the Corporation) whose share of liability has yet to be determined, the numerous yet-unresolved issues in many of the proceedings (including issues regarding class certification and the scope of many of the claims) and the attendant uncertainty of the various potential outcomes of such proceedings. Accordingly, the Corporation’s estimate will change from time to time, and actual losses may be more or less than the current estimate.

In the event of unexpected future developments, it is possible that the ultimate resolution of these matters, if unfavorable, may be material to the Corporation's consolidated financial condition, consolidated results of operations or consolidated cash flows.

For information regarding income tax contingencies, refer to Note 11.

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Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2014

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Loss

ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the nine months ended September 30, 2014 and 2013, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Nine Months Ended September 30,
(in millions)	2014			2013
Accumulated net unrealized gains (losses) on investment securities available-for-sale:
Balance at beginning of period, net of tax	$	(68	)	$	150
Net unrealized holding gains (losses) arising during the period	85			(270		)
Less: Provision (benefit) for income taxes	30			(100		)
Net unrealized holding gains (losses) arising during the period, net of tax	55			(170		)
Less:
Net realized gains included in net securities gains	1			1
Less: Provision for income taxes	—			—
Reclassification adjustment for net securities gains included in net income, net of tax	1			1
Change in net unrealized gains (losses) on investment securities available-for-sale, net of tax	54			(171		)
Balance at end of period, net of tax	$	(14	)	$	(21	)
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(323	)	$	(563	)
Amortization of actuarial net loss	30			65
Amortization of prior service cost	1			2
Amounts recognized in salaries and benefits expense	31			67
Less: Provision for income taxes	11			24
Change in defined benefit pension and other postretirement plans adjustment, net of tax	20			43
Balance at end of period, net of tax	$	(303	)	$	(520	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(317	)	$	(541	)

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Derivative And Credit-Related Financial Instruments (Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	$ 30,296	$ 29,617
Commercial And Other | Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	28,158	27,728
Bankcard, Revolving Check Credit And Home Equity Loan Commitments | Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	2,138	1,889
Standby Letters Of Credit
Loss contingency, range of possible loss, maximum	3,942	4,297
Commercial Letters Of Credit
Loss contingency, range of possible loss, maximum	65	103
Other Credit-Related Financial Instruments
Loss contingency, estimate of possible loss	$ 3	$ 2

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Variable Interest Entities (VIEs)

9 Months Ended

Sep. 30, 2014

Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]

Variable Interest Entities (VIEs)

VARIABLE INTEREST ENTITIES (VIEs)

The Corporation evaluates its interest in certain entities to determine if these entities meet the definition of a VIE and whether the Corporation is the primary beneficiary and should consolidate the entity based on the variable interests it held both at inception and when there is a change in circumstances that requires a reconsideration.

The Corporation holds ownership interests in funds in the form of limited partnerships or limited liability companies (LLCs) investing in affordable housing projects that qualify for the LIHTC. The Corporation also directly invests in limited partnerships and LLCs which invest in community development projects which generate similar tax credits to investors. As an investor, the Corporation obtains income tax credits and deductions from the operating losses of these tax credit entities. These tax credit entities meet the definition of a VIE; however, the Corporation is not the primary beneficiary of the entities, as the general partner or the managing member has both the power to direct the activities that most significantly impact the economic performance of the entities and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. While the partnership/LLC agreements allow the limited partners/investor members, through a majority vote, to remove the general partner/managing member, this right is not deemed to be substantive as the general partner/managing member can only be removed for cause.

The Corporation accounts for its interests in LIHTC entities using the proportional amortization method. Exposure to loss as a result of the Corporation’s involvement with LIHTC entities at September 30, 2014 was limited to approximately $379 million. Ownership interests in other community development projects which generate similar tax credits to investors (other tax credit entities) are accounted for under either the cost or equity method. Exposure to loss as a result of the Corporation's involvement in other tax credit entities at September 30, 2014 was limited to approximately $10 million.

Investment balances, including all legally binding commitments to fund future investments, are included in “accrued income and other assets” on the consolidated balance sheets. A liability is recognized in “accrued expenses and other liabilities” on the consolidated balance sheets for all legally binding unfunded commitments to fund tax credit entities ($131 million at September 30, 2014). Amortization and other write-downs of LIHTC investments are presented on a net basis as a component of the "provision for income taxes" on the consolidated statements of comprehensive income, while amortization and write-downs of other tax credit investments are recorded in “other noninterest income." The income tax credits and deductions are recorded as a reduction of income tax expense and a reduction of federal income taxes payable.

The Corporation provided no financial or other support that was not contractually required to any of the above VIEs during the nine months ended September 30, 2014 and 2013.

The following table summarizes the impact of these tax credit entities on line items on the Corporation’s consolidated statements of comprehensive income.

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Other noninterest income:
Amortization of other tax credit investments	$	(2	)	$	—		$	(5	)	$	—
Provision for income taxes:
Amortization of LIHTC investments	15			14			43			41
Low income housing tax credits	(15		)	(14		)	(43		)	(42		)
Other tax benefits related to tax credit entities	(6		)	(5		)	(19		)	(15		)
Total provision for income taxes	$	(6	)	$	(5	)	(19		)	(16		)

For further information on the Corporation’s consolidation policy, see Note 1 to these unaudited consolidated financial statements and Note 1 to the consolidated financial statements in the Corporation's 2013 Annual Report.

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Medium- And Long-Term Debt

9 Months Ended

Sep. 30, 2014

Debt Disclosure [Abstract]

Medium- And Long-Term Debt

MEDIUM- AND LONG-TERM DEBT

Medium- and long-term debt is summarized as follows:

(in millions)	September 30, 2014		December 31, 2013
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	308	$	318
3.80% subordinated notes due 2026 (a)	249		—
Medium-term notes:
3.00% notes due 2015	299		299
2.125% notes due 2019 (a)	346		—
Total parent company	1,202		617
Subsidiaries
Subordinated notes:
5.70% subordinated notes due 2014 (a)	—		255
8.375% subordinated notes called 2014	—		183
5.75% subordinated notes due 2016 (a)	672		681
5.20% subordinated notes due 2017 (a)	551		566
7.875% subordinated notes due 2026 (a)	221		213
Total subordinated notes	1,444		1,898
Federal Home Loan Bank advance:
Floating-rate based on LIBOR indices due 2014	—		1,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	23		28
Total subsidiaries	1,467		2,926
Total medium- and long-term debt	$	2,669	$	3,543

(a) The carrying value of medium- and long-term debt has been adjusted to reflect the gain or loss attributable to the risk hedged with interest rate swaps.

Subordinated notes with remaining maturities greater than one year qualify as Tier 2 capital.

Comerica Bank (the Bank) is a member of the FHLB, which provides short- and long-term funding to its members through advances collateralized by real estate-related assets. Actual borrowing capacity is contingent on the amount of collateral available to be pledged to the FHLB. At September 30, 2014, $14 billion of real estate-related loans were pledged to the FHLB as blanket collateral for potential future borrowings.

In the second quarter 2014, the Corporation issued $350 million of 2.125% senior notes due 2019, which were swapped to a floating rate based on six-month LIBOR. Proceeds were used for general corporate purposes.

In the third quarter 2014, the Corporation issued $250 million of 3.80% subordinated notes due 2026, which were swapped to a floating rate based on six-month LIBOR. Proceeds were used for general corporate purposes. Also in the third quarter 2014, the Corporation exercised its option to redeem, at par, $150 million of 8.375% subordinated notes, originally due in 2024. A gain of $32 million was recognized on the early redemption, primarily from the recognition of the unamortized value of a related, previously terminated interest rate swap.

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Net Income Per Common Share

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Net Income Per Common Share

NET INCOME PER COMMON SHARE

Basic and diluted net income per common share are presented in the following table.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share data)	2014		2013		2014		2013
Basic and diluted
Net income	$	154	$	147	$	444	$	424
Less:
Income allocated to participating securities	2		2		6		6
Net income attributable to common shares	$	152	$	145	$	438	$	418
Basic average common shares	179		182		179		184
Basic net income per common share	$	0.85	$	0.80	$	2.44	$	2.28
Basic average common shares	179		182		179		184
Dilutive common stock equivalents:
Net effect of assumed exercise of stock options	2		1		2		1
Net effect of the assumed exercise of warrants	4		4		5		2
Diluted average common shares	185		187		186		187
Diluted net income per common share	$	0.82	$	0.78	$	2.35	$	2.23

The following average shares related to outstanding options to purchase shares of common stock were not included in the computation of diluted net income per common share because the prices of the options were greater than the average market price of common shares for the period.

	Three Months Ended September 30,		Nine Months Ended September 30,
(shares in millions)	2014	2013	2014	2013
Average outstanding options	6.0	8.2	7.3	11.8
Range of exercise prices	$50.87 - $60.82	$41.70 - $61.94	$48.17 - $61.94	$34.78 - $61.94

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Medium- And Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Parent Company 2.125% notes due 2019	Jun. 30, 2014 Parent Company 2.125% notes due 2019	Sep. 30, 2014 Parent Company 3.80% subordinated notes due 2026	Sep. 30, 2014 Subsidiaries 8.375% subordinated notes due 2014	Dec. 31, 2013 Subsidiaries 8.375% subordinated notes due 2014
Debt Instruments [Line Items]
Stated interest rate					2.125%	2.125%	3.80%	8.375%	8.375%
Notes issued						$ 350,000,000	$ 250,000,000
Par value of subordinated notes called								150,000,000
Gain on debt redemption	32,000,000	0	32,000,000	1,000,000
Blanket lien on real-estate related loans securing FHLB advances	$ 14,000,000,000		$ 14,000,000,000

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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Investment securities, Balance at beginning of period, net of tax	$ (68)	$ 150
Investment securities, Net unrealized holding gains (losses) arising during the period	85	(270)
Investment securities, Provision (benefit) for income taxes	30	(100)
Investment securities, Net unrealized holding gains (losses) arising during period, net of tax	55	(170)
Investment securities, Net realized gains included in net securities gains	1	1
Investment securities, Provision for income taxes	0	0
Investment securities, Reclassification adjustment for net securities gains included in net income, net of tax	1	1
Investment securities, Change in net unrealized gains (losses) on investment securities available-for-sale, net of tax	54	(171)
Investment securities, Balance at end of period, net of tax	(14)	(21)
Benefit plans, Balance at beginning of period, net of tax	(323)	(563)
Amortization of actuarial net loss	30	65
Amortization of prior service cost	1	2
Benefit plans, Amounts recognized in salaries and benefits expense	31	67
Benefit plans, Provision for income taxes	11	24
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax	20	43
Benefit plans, Balance at end of period, net of tax	(303)	(520)
Total accumulated other comprehensive loss at end of period, net of tax	$ (317)	$ (541)	$ (391)

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Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Variable Interest Entity [Line Items]
Other noninterest income	$ 34	$ 43	$ 103	$ 128
Provision for income taxes	73	68	207	195
Variable Interest Entity
Variable Interest Entity [Line Items]
Other noninterest income	(2)	0	(5)	0
Provision for income taxes	(6)	(5)	(19)	(16)
Proportional amortization method classified in income taxes | Variable Interest Entity
Variable Interest Entity [Line Items]
Provision for income taxes	15	14	43	41
Low income housing tax credits | Variable Interest Entity
Variable Interest Entity [Line Items]
Provision for income taxes	(15)	(14)	(43)	(42)
Other tax benefits related to tax credit entities | Variable Interest Entity
Variable Interest Entity [Line Items]
Provision for income taxes	$ (6)	$ (5)	$ (19)	$ (15)

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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	$ 9,468	[1]	$ 9,307	[1]
Derivative assets	420		500
Derivative liabilities	87	[2]	52	[2]
U.S. Treasury and Other U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	45		45
Residential Mortgage-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	9,109	[3]	8,926	[3]
State And Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	23		22
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	53		56
Equity and Other Non-Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	238		258
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	107		108
Investment securities available-for-sale	9,468		9,307
Derivative assets	424		503
Total assets at fair value	9,999		9,918
Derivative liabilities	213		251
Deferred compensation plan liabilities	97		96
Total liabilities at fair value	310		347
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	99		103
Investment securities available-for-sale	170		167
Derivative assets	0		0
Total assets at fair value	269		270
Derivative liabilities	0		0
Deferred compensation plan liabilities	97		96
Total liabilities at fair value	97		96
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	8		5
Investment securities available-for-sale	9,161		8,981
Derivative assets	420		500
Total assets at fair value	9,589		9,486
Derivative liabilities	210		249
Deferred compensation plan liabilities	0		0
Total liabilities at fair value	210		249
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Investment securities available-for-sale	137		159
Derivative assets	4		3
Total assets at fair value	141		162
Derivative liabilities	3		2
Deferred compensation plan liabilities	0		0
Total liabilities at fair value	3		2
Recurring | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	306		380
Derivative liabilities	97		133
Recurring | Interest Rate Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Recurring | Interest Rate Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	306		380
Derivative liabilities	97		133
Recurring | Interest Rate Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Recurring | Energy Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	86		105
Derivative liabilities	85		102
Recurring | Energy Derivative Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Recurring | Energy Derivative Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	86		105
Derivative liabilities	85		102
Recurring | Energy Derivative Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Recurring | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	28		15
Derivative liabilities	28		14
Recurring | Foreign Exchange Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Recurring | Foreign Exchange Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	28		15
Derivative liabilities	28		14
Recurring | Foreign Exchange Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Recurring | Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4		3
Recurring | Warrants | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Recurring | Warrants | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Recurring | Warrants | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4		3
Recurring | Other Derivative Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	3		2
Recurring | Other Derivative Liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0		0
Recurring | Other Derivative Liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0		0
Recurring | Other Derivative Liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	3		2
Recurring | Deferred Compensation Plan Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	97		96
Recurring | Deferred Compensation Plan Assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	97		96
Recurring | Deferred Compensation Plan Assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Recurring | Deferred Compensation Plan Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Recurring | U.S. Treasury and Other U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	45		45
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	45		45
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring | Residential Mortgage-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	3	[3]	2	[3]
Investment securities available-for-sale	9,109	[3]	8,926	[3]
Recurring | Residential Mortgage-Backed Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	[3]	0	[3]
Investment securities available-for-sale	0	[3]	0	[3]
Recurring | Residential Mortgage-Backed Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	3	[3]	2	[3]
Investment securities available-for-sale	9,109	[3]	8,926	[3]
Recurring | Residential Mortgage-Backed Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	[3]	0	[3]
Investment securities available-for-sale	0	[3]	0	[3]
Recurring | State And Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	4		3
Investment securities available-for-sale	23		22
Recurring | State And Municipal Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Investment securities available-for-sale	0		0
Recurring | State And Municipal Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	4		3
Investment securities available-for-sale	0		0
Recurring | State And Municipal Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Investment securities available-for-sale	23	[4]	22	[4]
Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	1
Investment securities available-for-sale	53		56
Recurring | Corporate Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0
Investment securities available-for-sale	0		0
Recurring | Corporate Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	1
Investment securities available-for-sale	52		55
Recurring | Corporate Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0
Investment securities available-for-sale	1	[4]	1	[4]
Recurring | Equity and Other Non-Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	2		7
Investment securities available-for-sale	238		258
Recurring | Equity and Other Non-Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	2		7
Investment securities available-for-sale	125		122
Recurring | Equity and Other Non-Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Investment securities available-for-sale	0		0
Recurring | Equity and Other Non-Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Investment securities available-for-sale	$ 113	[4]	$ 136	[4]

[1] Included auction-rate securities at amortized cost and fair value of $138 million and $137 million, respectively, as of September 30, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

[2] Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $2 million at both September 30, 2014 and December 31, 2013.

[3] Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

[4] Auction-rate securities.

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Credit Quality And Allowance For Credit Losses (Average Individually Evaluated Impaired Loans And Related Interest Recognized) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	$ 254		$ 351		$ 259		$ 379
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		1		3		4
Business loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	210		304		212		332
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		1		3		4
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	74		96		68		105
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		0		1		2
Business loans | Real estate construction
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period					18		25
Individually Evaluated Impaired Loans Interest Income Recognized for the Period					0		0
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	16	[1]	24	[1]	17	[1]	25	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[1]	0	[1]	0	[1]	0	[1]
Business loans | Real estate construction | Other business lines
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period					1	[2]	0	[2]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period					0	[2]	0	[2]
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	119		184		124		201
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		1		2		2
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	49	[1]	78	[1]	56	[1]	87	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[1]	0	[1]	0	[1]	0	[1]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	70	[2]	106	[2]	68	[2]	114	[2]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[2]	1	[2]	2	[2]	2	[2]
Business loans | Lease financing
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period					0		1
Individually Evaluated Impaired Loans Interest Income Recognized for the Period					0		0
Business loans | International
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	1		0		2		0
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	44		47		47		47
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	29		35		31		36
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	15		12		16		11
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	11		8		12		7
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0		0		0
Retail loans | Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	4		4		4		4
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	$ 0		$ 0		$ 0		$ 0

[1] Primarily loans to real estate developers.

[2] Primarily loans secured by owner-occupied real estate.

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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

Allowance for Credit Losses

Allowance for Credit Losses

In the second quarter 2014, the Corporation enhanced the approach used to determine the standard reserve factors used in estimating the allowance for credit losses, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly.

Recently Adopted and Pending Accounting Pronouncements

Recently Adopted Accounting Pronouncement

Effective January 1, 2014, the Corporation early adopted Accounting Standards Update (ASU) No. 2014-01, “Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects,” an amendment to GAAP which enables companies that invest in affordable housing projects that qualify for the low-income housing tax credit (LIHTC) to elect to use the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial investment cost of the project is amortized in proportion to the amount of tax credits and other benefits received, with the results of the investment presented on a net basis as a component of the provision for income taxes. Previously, LIHTC investments were accounted for under the cost or equity method, and the amortization was recorded as a reduction to other noninterest income, with the tax credits and other benefits received recorded as a component of the provision for income taxes. The Corporation believes the proportional amortization method better represents the economics of LIHTC investments and provides users with a better understanding of the returns from such investments than the cost or equity method.

The cumulative effect of the retrospective application of the change in amortization method was a $3 million decrease to both "accrued income and other assets" and "retained earnings" on the consolidated balance sheets as of January 1, 2013. The unaudited consolidated financial statements have been retrospectively adjusted to reflect the prior period effect of the adoption of the amendment, which resulted in increases of $14 million and $41 million to both "other noninterest income" and "provision for income taxes" for the three- and nine-month periods ended September 30, 2013, respectively. The adoption of ASU 2014-01 had no effect on net income or earnings per common share for any period presented.

See Note 6 to these unaudited consolidated financial statements for additional information regarding LIHTC and other tax credit investments.

Pending Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous GAAP comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2016, and must be retrospectively applied. Entities will have the option of presenting prior periods as impacted by the new guidance or presenting the cumulative effect of initial application along with supplementary disclosures. Early adoption is prohibited. The Corporation is currently evaluating the impact of adopting ASU 2014-09.

In June 2014, the FASB issued ASU No. 2014-12, “Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” (ASU 2014-12). The new guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. ASU 2014-12 is effective for annual and interim periods beginning after December 15, 2015, with early adoption permitted. The Corporation's current accounting treatment of performance conditions for employees who are or become retirement eligible prior to the achievement of the performance target are consistent with ASU 2014-12, and as such does not expect the new guidance to have a material effect on the Corporation’s financial condition and results of operations. The Corporation expects to prospectively adopt ASU 2014-12 in the first quarter 2015.

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Variable Interest Entities (VIEs) (Tables)

9 Months Ended

Sep. 30, 2014

Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]

Impact Of VIEs On The Consolidated Statements Of Comprehensive Income

The following table summarizes the impact of these tax credit entities on line items on the Corporation’s consolidated statements of comprehensive income.

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Other noninterest income:
Amortization of other tax credit investments	$	(2	)	$	—		$	(5	)	$	—
Provision for income taxes:
Amortization of LIHTC investments	15			14			43			41
Low income housing tax credits	(15		)	(14		)	(43		)	(42		)
Other tax benefits related to tax credit entities	(6		)	(5		)	(19		)	(15		)
Total provision for income taxes	$	(6	)	$	(5	)	(19		)	(16		)

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Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Credit Losses On Lending-Related Commitments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ 5	$ 8	$ 25	$ 37
Lending-related commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	42	36	36	32
Provision for credit losses	1	(2)	7	2
Balance at end of period	$ 43	$ 34	$ 43	$ 34

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Investment Securities (Summary Of Investment Securities Available-For-Sale In Unrealized Loss Positions) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Temporarily Impaired Less than 12 months, Fair Value	$ 1,434		$ 5,825
Temporarily Impaired Less than 12 Months, Unrealized Losses	11		187
Temporarily Impaired 12 months or more, Fair Value	3,656		182
Temporarily Impaired 12 Months or more, Unrealized Losses	119		12
Temporarily Impaired Total, Fair Value	5,090		6,007
Temporarily Impaired Total, Unrealized Losses	130		199
Residential Mortgage-Backed Securities
Temporarily Impaired Less than 12 months, Fair Value	1,434	[1]	5,825	[1]
Temporarily Impaired Less than 12 Months, Unrealized Losses	11	[1]	187	[1]
Temporarily Impaired 12 months or more, Fair Value	3,519	[1]	11	[1]
Temporarily Impaired 12 Months or more, Unrealized Losses	117	[1]	1	[1]
Temporarily Impaired Total, Fair Value	4,953	[1]	5,836	[1]
Temporarily Impaired Total, Unrealized Losses	128	[1]	188	[1]
State And Municipal Securities
Temporarily Impaired Less than 12 months, Fair Value	0	[2]	0	[2]
Temporarily Impaired Less than 12 Months, Unrealized Losses	0	[2]	0	[2]
Temporarily Impaired 12 months or more, Fair Value	23	[2]	22	[2]
Temporarily Impaired 12 Months or more, Unrealized Losses	1	[2]	2	[2]
Temporarily Impaired Total, Fair Value	23	[2]	22	[2]
Temporarily Impaired Total, Unrealized Losses	1	[2]	2	[2]
Corporate Debt Securities
Temporarily Impaired Less than 12 months, Fair Value	0	[2]	0	[2]
Temporarily Impaired Less than 12 Months, Unrealized Losses	0	[2]	0	[2]
Temporarily Impaired 12 months or more, Fair Value	1	[2]	1	[2]
Temporarily Impaired 12 Months or more, Unrealized Losses	0	[2],[3]	0	[2],[3]
Temporarily Impaired Total, Fair Value	1	[2]	1	[2]
Temporarily Impaired Total, Unrealized Losses	0	[2],[3]	0	[2],[3]
Equity and Other Non-Debt Securities
Temporarily Impaired Less than 12 months, Fair Value	0	[2]	0	[2]
Temporarily Impaired Less than 12 Months, Unrealized Losses	0	[2]	0	[2]
Temporarily Impaired 12 months or more, Fair Value	113	[2]	148	[2]
Temporarily Impaired 12 Months or more, Unrealized Losses	1	[2]	9	[2]
Temporarily Impaired Total, Fair Value	113	[2]	148	[2]
Temporarily Impaired Total, Unrealized Losses	$ 1	[2]	$ 9	[2]

[1] Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

[2] Auction-rate securities.

[3] Unrealized losses less than $0.5 million.

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Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Millions	Total	Common Stock	Capital Surplus	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock
BALANCE at Dec. 31, 2012	$ 6,939	$ 1,141	$ 2,162	$ (413)	$ 5,928	$ (1,879)
BALANCE (in shares) at Dec. 31, 2012		188.3
Net income	424				424
Other comprehensive income (loss), net of tax	(128)			(128)
Cash dividends declared on common stock	(95)				(95)
Purchase of common stock	(218)					(218)
Purchase of common stock (in shares)		(5.8)
Net issuance of common stock under employee stock plans	17		(18)		(21)	56
Net issuance of common stock under employee stock plans (in shares)		1.2
Share-based compensation	27		27
BALANCE at Sep. 30, 2013	6,966	1,141	2,171	(541)	6,236	(2,041)
BALANCE (in shares) at Sep. 30, 2013		183.7
BALANCE at Dec. 31, 2013	7,150	1,141	2,179	(391)	6,318	(2,097)
BALANCE (in shares) at Dec. 31, 2013		182.3
Net income	444				444
Other comprehensive income (loss), net of tax	74			74
Cash dividends declared on common stock	(107)				(107)
Purchase of common stock	(200)					(200)
Purchase of common stock (in shares)		(4.1)
Net issuance of common stock under employee stock plans	41		(26)		(24)	91
Net issuance of common stock under employee stock plans (in shares)		2.0
Share-based compensation	31		31
Other	0		(1)			1
Other (in shares)		0
BALANCE at Sep. 30, 2014	$ 7,433	$ 1,141	$ 2,183	$ (317)	$ 6,631	$ (2,205)
BALANCE (in shares) at Sep. 30, 2014		180.2

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Investment Securities

9 Months Ended

Sep. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Investment Securities

INVESTMENT SECURITIES

A summary of the Corporation’s investment securities available-for-sale follows:

(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
September 30, 2014
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,131		106		128		9,109
State and municipal securities	24		—		1		23
Corporate debt securities	53		—		—		53
Equity and other non-debt securities	238		1		1		238
Total investment securities available-for-sale (b)	$	9,491	$	107	$	130	$	9,468
December 31, 2013
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,023		91		188		8,926
State and municipal securities	24		—		2		22
Corporate debt securities	56		—		—		56
Equity and other non-debt securities	266		1		9		258
Total investment securities available-for-sale (b)	$	9,414	$	92	$	199	$	9,307

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Included auction-rate securities at amortized cost and fair value of $138 million and $137 million, respectively, as of September 30, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

A summary of the Corporation’s investment securities available-for-sale in an unrealized loss position as of September 30, 2014 and December 31, 2013 follows:

	Temporarily Impaired
	Less than 12 Months				12 Months or more					Total
(in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
September 30, 2014
Residential mortgage-backed securities (a)	$	1,434	$	11	$	3,519	$	117		$	4,953	$	128
State and municipal securities (b)	—		—		23		1			23		1
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		113		1			113		1
Total impaired securities	$	1,434	$	11	$	3,656	$	119		$	5,090	$	130
December 31, 2013
Residential mortgage-backed securities (a)	$	5,825	$	187	$	11	$	1		$	5,836	$	188
State and municipal securities (b)	—		—		22		2			22		2
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		148		9			148		9
Total impaired securities	$	5,825	$	187	$	182	$	12		$	6,007	$	199

(a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

(b) Auction-rate securities.

(c) Unrealized losses less than $0.5 million.

At September 30, 2014, the Corporation had 162 securities in an unrealized loss position with no credit impairment, including 101 residential mortgage-backed securities, 43 equity and other non-debt auction-rate preferred securities, 17 state and municipal auction-rate securities, and one corporate auction-rate debt security. As of September 30, 2014, approximately 89 percent of the aggregate par value of auction-rate securities have been redeemed or sold since acquisition, of which approximately 95 percent were redeemed at or above cost. The unrealized losses for these securities resulted from changes in market interest rates and liquidity. The Corporation ultimately expects full collection of the carrying amount of these securities, does not intend to sell the securities in an unrealized loss position, and it is not more-likely-than-not that the Corporation will be required to sell the securities in an unrealized loss position prior to recovery of amortized cost. The Corporation does not consider these securities to be other-than-temporarily impaired at September 30, 2014.

Sales, calls and write-downs of investment securities available-for-sale resulted in the following gains and losses recorded in “net securities (losses) gains” on the consolidated statements of comprehensive income, computed based on the adjusted cost of the specific security.

	Nine Months Ended September 30,
(in millions)	2014			2013
Securities gains	$	1		$	1
Securities losses (a)	(1		)	(2		)
Net securities (losses) gains	$	—		$	(1	)

(a) Primarily charges related to a derivative contract tied to the conversion rate of Visa Class B shares.

The following table summarizes the amortized cost and fair values of debt securities by contractual maturity. Securities with multiple maturity dates are classified in the period of final maturity. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(in millions)
September 30, 2014	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	131	$	132
After one year through five years	443		442
After five years through ten years	571		600
After ten years	8,108		8,056
Subtotal	9,253		9,230
Equity and other non-debt securities	238		238
Total investment securities available-for-sale	$	9,491	$	9,468

Included in the contractual maturity distribution in the table above were auction-rate securities with a total amortized cost and fair value of $24 million and $23 million, respectively. Auction-rate securities are long-term, floating rate instruments for which interest rates are reset at periodic auctions. At each successful auction, the Corporation has the option to sell the security at par value. Additionally, the issuers of auction-rate securities generally have the right to redeem or refinance the debt. As a result, the expected life of auction-rate securities may differ significantly from the contractual life. Also included in the table above were residential mortgage-backed securities with total amortized cost and fair value of $9.1 billion. The actual cash flows of mortgage-backed securities may differ from contractual maturity as the borrowers of the underlying loans may exercise prepayment options.

At September 30, 2014, investment securities with a carrying value of $3.1 billion were pledged where permitted or required by law to secure $2.1 billion of liabilities, primarily public and other deposits of state and local government agencies and derivative instruments.

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Derivative And Credit-Related Financial Instruments (Schedule Of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Notional Amount	$ 21,396	[1]	$ 20,538	[1]
Risk Management Purposes
Notional Amount	2,226	[1]	1,703	[1]
Long-term Debt | Swaps - Fair Value Hedge - Receive Fixed/Pay Floating | Risk Management Purposes | Interest Rate Swaps
Notional Amount	$ 1,800		$ 1,450
Weighted Average Remaining Maturity	4 years 9 months 15 days		3 years 5 months 0 days
Weighted Average Receive Rate	4.54%		5.45%
Weighted Average Pay Rate	0.49%	[2]	0.38%	[2]

[1] Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

[2] Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at September 30, 2014 and December 31, 2013.

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Employee Benefit Plans Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Net periodic defined benefit cost			$ 29	$ 65
Defined Benefit Pension Plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	9	22	28
Interest cost	22	20	66	59
Expected return on plan assets	(33)	(33)	(99)	(99)
Amortization of prior service cost (credit)	1	1	4	3
Amortization of net loss	9	18	24	56
Net periodic defined benefit cost	6	15	17	47
Defined Benefit Pension Plans | Non-Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	3	3
Interest cost	2	2	7	7
Amortization of prior service cost (credit)	(1)	0	(3)	(1)
Amortization of net loss	2	3	5	8
Net periodic defined benefit cost	4	6	12	17
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	1	2	3
Expected return on plan assets	(1)	(1)	(3)	(3)
Amortization of net loss	1	0	1	1
Net periodic defined benefit cost	$ 0	$ 0	$ 0	$ 1

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Medium- And Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2014

Debt Disclosure [Abstract]

Schedule Of Medium- And Long-Term Debt

Medium- and long-term debt is summarized as follows:

(in millions)	September 30, 2014		December 31, 2013
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	308	$	318
3.80% subordinated notes due 2026 (a)	249		—
Medium-term notes:
3.00% notes due 2015	299		299
2.125% notes due 2019 (a)	346		—
Total parent company	1,202		617
Subsidiaries
Subordinated notes:
5.70% subordinated notes due 2014 (a)	—		255
8.375% subordinated notes called 2014	—		183
5.75% subordinated notes due 2016 (a)	672		681
5.20% subordinated notes due 2017 (a)	551		566
7.875% subordinated notes due 2026 (a)	221		213
Total subordinated notes	1,444		1,898
Federal Home Loan Bank advance:
Floating-rate based on LIBOR indices due 2014	—		1,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	23		28
Total subsidiaries	1,467		2,926
Total medium- and long-term debt	$	2,669	$	3,543

(a) The carrying value of medium- and long-term debt has been adjusted to reflect the gain or loss attributable to the risk hedged with interest rate swaps.

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Business Segment Information (Market Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Net interest income (expense) (FTE)			$ 1,243		$ 1,244
Provision for credit losses	5	8	25		37
Noninterest income	215	228	643		663
Noninterest expenses	397	417	1,207		1,249
Provision (benefit) for income taxes (FTE)			210		197
Net income (loss)	154	147	444		424
Net credit-related charge-offs (recoveries)			24		60
Assets, average			65,336		63,707
Loans, average			46,327		44,533
Deposits, average			53,781		51,355
Return on average assets			0.91%	[1]	0.89%	[1]
Efficiency ratio			63.99%	[2]	65.45%	[2]
Michigan
Net interest income (expense) (FTE)			544		564
Provision for credit losses			(13)		(16)
Noninterest income			268		268
Noninterest expenses			487		496
Provision (benefit) for income taxes (FTE)			122		125
Net income (loss)			216		227
Net credit-related charge-offs (recoveries)			13		10
Assets, average			13,797		13,936
Loans, average			13,400		13,508
Deposits, average			20,853		20,294
Return on average assets			1.32%	[1]	1.42%	[1]
Efficiency ratio			59.87%	[2]	59.52%	[2]
California
Net interest income (expense) (FTE)			531		516
Provision for credit losses			39		22
Noninterest income			109		113
Noninterest expenses			299		298
Provision (benefit) for income taxes (FTE)			113		115
Net income (loss)			189		194
Net credit-related charge-offs (recoveries)			21		30
Assets, average			15,543		14,072
Loans, average			15,259		13,826
Deposits, average			15,506		14,532
Return on average assets			1.52%	[1]	1.66%	[1]
Efficiency ratio			46.74%	[2]	47.39%	[2]
Texas
Net interest income (expense) (FTE)			403		394
Provision for credit losses			32		31
Noninterest income			95		100
Noninterest expenses			274		272
Provision (benefit) for income taxes (FTE)			70		67
Net income (loss)			122		124
Net credit-related charge-offs (recoveries)			8		7
Assets, average			11,525		10,774
Loans, average			10,829		10,064
Deposits, average			10,743		10,149
Return on average assets			1.36%	[1]	1.46%	[1]
Efficiency ratio			55.02%	[2]	54.96%	[2]
Other Markets
Net interest income (expense) (FTE)			231		239
Provision for credit losses			(26)		5
Noninterest income			121		129
Noninterest expenses			144		148
Provision (benefit) for income taxes (FTE)			60		54
Net income (loss)			174		161
Net credit-related charge-offs (recoveries)			(18)		13
Assets, average			7,284		7,664
Loans, average			6,839		7,135
Deposits, average			6,187		5,861
Return on average assets			3.19%	[1]	2.80%	[1]
Efficiency ratio			41.12%	[2]	40.22%	[2]
Finance & Other
Net interest income (expense) (FTE)			(466)		(469)
Provision for credit losses			(7)		(5)
Noninterest income			50		53
Noninterest expenses			3		35
Provision (benefit) for income taxes (FTE)			(155)		(164)
Net income (loss)			(257)		(282)
Net credit-related charge-offs (recoveries)			0		0
Assets, average			17,187		17,261
Loans, average			0		0
Deposits, average			$ 492		$ 519

[1] Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

[2] Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

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Fair Value Measurements (Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value In Their Entirety On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Cash and due from banks	$ 1,039		$ 1,140
Interest-bearing deposits with banks	6,748		5,311
Total loans, net of allowance for loan losses	47,116		44,872
Demand deposits (noninterest-bearing)	27,490		23,875
Customer certificates of deposit	4,698		5,063
Total deposits	57,581		53,292
Short-term borrowings	202		253
Medium- and long-term debt	2,669		3,543
Carrying Amount
Cash and due from banks	1,039		1,140
Interest-bearing deposits with banks	6,748		5,311
Loans held-for-sale	5		4
Total loans, net of allowance for loan losses	47,116	[1]	44,872	[1]
Customers' liability on acceptances outstanding	15		11
Nonmarketable equity securities	12	[2]	12	[2]
Restricted equity investments	92		133
Demand deposits (noninterest-bearing)	27,490		23,875
Interest-bearing deposits	25,393		24,354
Customer certificates of deposit	4,698		5,063
Total deposits	57,581		53,292
Short-term borrowings	202		253
Acceptances outstanding	15		11
Medium- and long-term debt	2,669		3,543
Credit-related financial instruments	(91)		(88)
Estimated Fair Value
Cash and due from banks	1,039		1,140
Interest-bearing deposits with banks	6,748		5,311
Loans held-for-sale	5		4
Total loans, net of allowance for loan losses	46,980	[1]	44,801	[1]
Customers' liability on acceptances outstanding	15		11
Nonmarketable equity securities	19	[2]	19	[2]
Restricted equity investments	92		133
Demand deposits (noninterest-bearing)	27,490		23,875
Interest-bearing deposits	25,393		24,354
Customer certificates of deposit	4,686		5,055
Total deposits	57,569		53,284
Short-term borrowings	202		253
Acceptances outstanding	15		11
Medium- and long-term debt	2,696		3,540
Credit-related financial instruments	(91)		(88)
Level 1 | Estimated Fair Value
Cash and due from banks	1,039		1,140
Interest-bearing deposits with banks	6,748		5,311
Loans held-for-sale	0		0
Total loans, net of allowance for loan losses	0		0
Customers' liability on acceptances outstanding	15		11
Nonmarketable equity securities	0		0
Restricted equity investments	92		133
Demand deposits (noninterest-bearing)	0		0
Interest-bearing deposits	0		0
Customer certificates of deposit	0		0
Total deposits	0		0
Short-term borrowings	202		253
Acceptances outstanding	15		11
Medium- and long-term debt	0		0
Credit-related financial instruments	0		0
Level 2 | Estimated Fair Value
Cash and due from banks	0		0
Interest-bearing deposits with banks	0		0
Loans held-for-sale	5		4
Total loans, net of allowance for loan losses	0		0
Customers' liability on acceptances outstanding	0		0
Nonmarketable equity securities	0		0
Restricted equity investments	0		0
Demand deposits (noninterest-bearing)	27,490		23,875
Interest-bearing deposits	25,393		24,354
Customer certificates of deposit	4,686		5,055
Total deposits	57,569		53,284
Short-term borrowings	0		0
Acceptances outstanding	0		0
Medium- and long-term debt	2,696		3,540
Credit-related financial instruments	0		0
Level 3 | Estimated Fair Value
Cash and due from banks	0		0
Interest-bearing deposits with banks	0		0
Loans held-for-sale	0		0
Total loans, net of allowance for loan losses	46,980	[1]	44,801	[1]
Customers' liability on acceptances outstanding	0		0
Nonmarketable equity securities	19	[2]	19	[2]
Restricted equity investments	0		0
Demand deposits (noninterest-bearing)	0		0
Interest-bearing deposits	0		0
Customer certificates of deposit	0		0
Total deposits	0		0
Short-term borrowings	0		0
Acceptances outstanding	0		0
Medium- and long-term debt	0		0
Credit-related financial instruments	(91)		(88)
Nonrecurring | Level 3
Total loans, net of allowance for loan losses	96		128
Nonmarketable equity securities	$ 1		$ 2

[1] Included $96 million and $128 million of impaired loans recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

[2] Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at September 30, 2014 and December 31, 2013, respectively.

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Business Segment Information

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Business Segment Information

BUSINESS SEGMENT INFORMATION

The Corporation has strategically aligned its operations into three major business segments: the Business Bank, the Retail Bank and Wealth Management. These business segments are differentiated based on the type of customer and the related products and services provided. In addition to the three major business segments, the Finance Division is also reported as a segment. Business segment results are produced by the Corporation’s internal management accounting system. This system measures financial results based on the internal business unit structure of the Corporation. The performance of the business segments is not comparable with the Corporation's consolidated results and is not necessarily comparable with similar information for any other financial institution. 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. The management accounting system assigns balance sheet and income statement items to each business segment using certain methodologies, which are regularly reviewed and refined. These methodologies may be modified as the management accounting system is enhanced and changes occur in the organizational structure and/or product lines. For comparability purposes, amounts in all periods are based on business segments and methodologies in effect at September 30, 2014.

In the second quarter 2014, the Corporation enhanced the approach used to determine the standard reserve factors used in estimating the allowance for credit losses, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly. As a result, the current year provision for credit losses within each segment is not comparable to prior period amounts.

The following discussion provides information about the activities of each business segment. A discussion of the financial results and the factors impacting performance can be found in the section entitled "Business Segments" in the financial review.

The Business Bank meets the needs of middle market businesses, multinational corporations and governmental entities by offering various products and services, including commercial loans and lines of credit, deposits, cash management, capital market products, international trade finance, letters of credit, foreign exchange management services and loan syndication services.

The Retail Bank includes small business banking and personal financial services, consisting of consumer lending, consumer deposit gathering and mortgage loan origination. In addition to a full range of financial services provided to small business customers, this business segment offers a variety of consumer products, including deposit accounts, installment loans, credit cards, student loans, home equity lines of credit and residential mortgage loans.

Wealth Management offers products and services consisting of fiduciary services, private banking, retirement services, investment management and advisory services, investment banking and brokerage services. This business segment also offers the sale of annuity products, as well as life, disability and long-term care insurance products.

The Finance segment includes the Corporation’s securities portfolio and asset and liability management activities. This segment is responsible for managing the Corporation’s funding, liquidity and capital needs, performing interest sensitivity analysis and executing various strategies to manage the Corporation’s exposure to liquidity, interest rate risk and foreign exchange risk.

The Other category includes discontinued operations, the income and expense impact of equity and cash, tax benefits not assigned to specific business segments, charges of an unusual or infrequent nature that are not reflective of the normal operations of the business segments and miscellaneous other expenses of a corporate nature.

For further information on the methodologies which form the basis for these results refer to Note 22 to the consolidated financial statements in the Corporation's 2013 Annual Report.

Business segment financial results are as follows:

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Nine Months Ended September 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	1,124		$	446		$	139		$	(485	)	$	19		$	1,243
Provision for credit losses	45			(2		)	(11		)	—			(7		)	25
Noninterest income	275			123			195			44			6			643
Noninterest expenses	441			524			239			(24		)	27			1,207
Provision (benefit) for income taxes (FTE)	311			16			38			(160		)	5			210
Net income (loss)	$	602		$	31		$	68		$	(257	)	$	—		$	444
Net credit-related charge-offs	$	16		$	7		$	1		$	—		$	—		$	24
Selected average balances:
Assets	$	37,094		$	6,074		$	4,981		$	11,070		$	6,117		$	65,336
Loans	36,124			5,406			4,797			—			—			46,327
Deposits	27,755			21,600			3,934			246			246			53,781
Statistical data:
Return on average assets (a)	2.17		%	0.19		%	1.81		%	N/M			N/M			0.91		%
Efficiency ratio (b)	31.56			91.81			71.95			N/M			N/M			63.99

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Nine Months Ended September 30, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	1,115		$	460		$	138		$	(492	)	$	23		$	1,244
Provision for credit losses	29			21			(8		)	—			(5		)	37
Noninterest income	287			132			191			47			6			663
Noninterest expenses	446			530			238			7			28			1,249
Provision (benefit) for income taxes (FTE)	312			14			35			(168		)	4			197
Net income (loss)	$	615		$	27		$	64		$	(284	)	$	2		$	424
Net credit-related charge-offs	$	37		$	18		$	5		$	—		$	—		$	60
Selected average balances:
Assets	$	35,694		$	5,967		$	4,785		$	11,553		$	5,708		$	63,707
Loans	34,626			5,278			4,629			—			—			44,533
Deposits	25,931			21,183			3,722			309			210			51,355
Statistical data:
Return on average assets (a)	2.30		%	0.17		%	1.78		%	N/M			N/M			0.89		%
Efficiency ratio (b)	31.78			89.19			72.64			N/M			N/M			65.45

(a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

(b)    Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

FTE – Fully Taxable Equivalent

N/M – not meaningful

The Corporation operates in three primary markets - Texas, California, and Michigan, as well as in Arizona and Florida, with select businesses operating in several other states, and in Canada and Mexico. The Corporation produces market segment results for the Corporation’s three primary geographic markets as well as Other Markets. Other Markets includes Florida, Arizona, the International Finance division and businesses with a national perspective. The Finance & Other category includes the Finance segment and the Other category as previously described. Market segment results are provided as supplemental information to the business segment results and may not meet all operating segment criteria as set forth in GAAP. For comparability purposes, amounts in all periods are based on market segments and methodologies in effect at September 30, 2014.

A discussion of the financial results and the factors impacting performance can be found in the section entitled "Market Segments" in the financial review.

Market segment financial results are as follows:

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Nine Months Ended September 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	544		$	531		$	403		$	231		$	(466	)	$	1,243
Provision for credit losses	(13		)	39			32			(26		)	(7		)	25
Noninterest income	268			109			95			121			50			643
Noninterest expenses	487			299			274			144			3			1,207
Provision (benefit) for income taxes (FTE)	122			113			70			60			(155		)	210
Net income (loss)	$	216		$	189		$	122		$	174		$	(257	)	$	444
Net credit-related charge-offs (recoveries)	$	13		$	21		$	8		$	(18	)	$	—		$	24
Selected average balances:
Assets	$	13,797		$	15,543		$	11,525		$	7,284		$	17,187		$	65,336
Loans	13,400			15,259			10,829			6,839			—			46,327
Deposits	20,853			15,506			10,743			6,187			492			53,781
Statistical data:
Return on average assets (a)	1.32		%	1.52		%	1.36		%	3.19		%	N/M			0.91		%
Efficiency ratio (b)	59.87			46.74			55.02			41.12			N/M			63.99

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Nine Months Ended September 30, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	564		$	516		$	394		$	239		$	(469	)	$	1,244
Provision for credit losses	(16		)	22			31			5			(5		)	37
Noninterest income	268			113			100			129			53			663
Noninterest expenses	496			298			272			148			35			1,249
Provision (benefit) for income taxes (FTE)	125			115			67			54			(164		)	197
Net income (loss)	$	227		$	194		$	124		$	161		$	(282	)	$	424
Net credit-related charge-offs	$	10		$	30		$	7		$	13		$	—		$	60
Selected average balances:
Assets	$	13,936		$	14,072		$	10,774		$	7,664		$	17,261		$	63,707
Loans	13,508			13,826			10,064			7,135			—			44,533
Deposits	20,294			14,532			10,149			5,861			519			51,355
Statistical data:
Return on average assets (a)	1.42		%	1.66		%	1.46		%	2.80		%	N/M			0.89		%
Efficiency ratio (b)	59.52			47.39			54.96			40.22			N/M			65.45

(a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

(b)    Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

FTE – Fully Taxable Equivalent

N/M – not meaningful