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 March 31, 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 April 25, 2014: 181,673,675 shares

COMERICA INCORPORATED AND SUBSIDIARIES

TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION
ITEM 1. Financial Statements
Consolidated Balance Sheets at March 31, 2014 (unaudited) and December 31, 2013	1
Consolidated Statements of Comprehensive Income for the Three Months Ended March 31, 2014 and 2013 (unaudited)	2
Consolidated Statements of Changes in Shareholders’ Equity for the Three Months Ended March 31, 2014 and 2013 (unaudited)	3
Consolidated Statements of Cash Flows for the Three Months Ended March 31, 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	38
ITEM 3. Quantitative and Qualitative Disclosures about Market Risk	61
ITEM 4. Controls and Procedures	61
PART II. OTHER INFORMATION
ITEM 1. Legal Proceedings	61
ITEM 1A. Risk Factors	61
ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds	61
ITEM 6. Exhibits	62
Signature	63

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements

CONSOLIDATED BALANCE SHEETS

Comerica Incorporated and Subsidiaries

(in millions, except share data)	March 31, 2014			December 31, 2013
	(unaudited)
ASSETS
Cash and due from banks	$	1,186		$	1,140
Interest-bearing deposits with banks	4,434			5,311
Other short-term investments	105			112
Investment securities available-for-sale	9,487			9,307
Commercial loans	29,774			28,815
Real estate construction loans	1,847			1,762
Commercial mortgage loans	8,801			8,787
Lease financing	849			845
International loans	1,250			1,327
Residential mortgage loans	1,751			1,697
Consumer loans	2,217			2,237
Total loans	46,489			45,470
Less allowance for loan losses	(594		)	(598		)
Net loans	45,895			44,872
Premises and equipment	583			594
Accrued income and other assets	3,991			3,888
Total assets	$	65,681		$	65,224
LIABILITIES AND SHAREHOLDERS’ EQUITY
Noninterest-bearing deposits	$	23,955		$	23,875
Money market and interest-bearing checking deposits	22,485			22,332
Savings deposits	1,742			1,673
Customer certificates of deposit	5,099			5,063
Foreign office time deposits	469			349
Total interest-bearing deposits	29,795			29,417
Total deposits	53,750			53,292
Short-term borrowings	160			253
Accrued expenses and other liabilities	954			986
Medium- and long-term debt	3,534			3,543
Total liabilities	58,398			58,074
Common stock - $5 par value:
Authorized - 325,000,000 shares
Issued - 228,164,824 shares	1,141			1,141
Capital surplus	2,182			2,179
Accumulated other comprehensive loss	(325		)	(391		)
Retained earnings	6,414			6,318
Less cost of common stock in treasury - 46,492,524 shares at 3/31/14 and 45,860,786 shares at 12/31/13	(2,129		)	(2,097		)
Total shareholders’ equity	7,283			7,150
Total liabilities and shareholders’ equity	$	65,681		$	65,224

See notes to consolidated financial statements.

1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited)

Comerica Incorporated and Subsidiaries 

	Three Months Ended March 31,
(in millions, except per share data)	2014		2013
INTEREST INCOME
Interest and fees on loans	$	376	$	390
Interest on investment securities	55		53
Interest on short-term investments	4		3
Total interest income	435		446
INTEREST EXPENSE
Interest on deposits	11		15
Interest on medium- and long-term debt	14		15
Total interest expense	25		30
Net interest income	410		416
Provision for credit losses	9		16
Net interest income after provision for credit losses	401		400
NONINTEREST INCOME
Service charges on deposit accounts	54		55
Fiduciary income	44		43
Commercial lending fees	20		21
Card fees	19		17
Letter of credit fees	14		16
Bank-owned life insurance	9		9
Foreign exchange income	9		9
Brokerage fees	5		5
Net securities gains	1		—
Other noninterest income	33		38
Total noninterest income	208		213
NONINTEREST EXPENSES
Salaries and benefits expense	247		251
Net occupancy expense	40		39
Equipment expense	14		15
Outside processing fee expense	28		28
Software expense	22		22
Litigation-related expense	3		3
FDIC insurance expense	8		9
Advertising expense	6		6
Other noninterest expenses	38		43
Total noninterest expenses	406		416
Income before income taxes	203		197
Provision for income taxes	64		63
NET INCOME	139		134
Less income allocated to participating securities	2		2
Net income attributable to common shares	$	137	$	132
Earnings per common share:
Basic	$	0.76	$	0.71
Diluted	0.73		0.70
Comprehensive income	205		137
Cash dividends declared on common stock	35		32
Cash dividends declared per common share	0.19		0.17

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	—		—		—			—			134			—			134
Other comprehensive income, net of tax	—		—		—			3			—			—			3
Cash dividends declared on common stock ($0.17 per share)	—		—		—			—			(32		)	—			(32		)
Purchase of common stock	(2.2	)	—		—			—			—			(74		)	(74		)
Net issuance of common stock under employee stock plans	0.7		—		(15		)	—			(13		)	33			5
Share-based compensation	—		—		10			—			—			—			10
BALANCE AT MARCH 31, 2013	186.8		$	1,141	$	2,157		$	(410	)	$	6,017		$	(1,920	)	$	6,985
BALANCE AT DECEMBER 31, 2013	182.3		$	1,141	$	2,179		$	(391	)	$	6,318		$	(2,097	)	$	7,150
Net income	—		—		—			—			139			—			139
Other comprehensive income, net of tax	—		—		—			66			—			—			66
Cash dividends declared on common stock ($0.19 per share)	—		—		—			—			(35		)	—			(35		)
Purchase of common stock	(1.7	)	—		—			—			—			(80		)	(80		)
Net issuance of common stock under employee stock plans	1.1		—		(11		)	—			(8		)	48			29
Share-based compensation	—		—		14			—			—			—			14
BALANCE AT MARCH 31, 2014	181.7		$	1,141	$	2,182		$	(325	)	$	6,414		$	(2,129	)	$	7,283

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)

Comerica Incorporated and Subsidiaries

	Three Months Ended March 31,
(in millions)	2014			2013
OPERATING ACTIVITIES
Net income	$	139		$	134
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	9			16
Provision (benefit) for deferred income taxes	(5		)	29
Depreciation and amortization	29			30
Net periodic defined benefit cost	9			21
Share-based compensation expense	14			10
Net amortization of securities	2			10
Accretion of loan purchase discount	(12		)	(11		)
Net securities gains	(1		)	—
Net gain on foreclosed property sold	(1		)	(1		)
Excess tax benefits from share-based compensation arrangements	(5		)	(1		)
Net change in:
Trading securities	5			10
Accrued income receivable	—			(10		)
Accrued expenses payable	(61		)	(72		)
Other, net	92			94
Net cash provided by operating activities	214			259
INVESTING ACTIVITIES
Investment securities available-for-sale:
Maturities and redemptions	411			938
Purchases	(499		)	(955		)
Net change in loans	(1,026		)	971
Proceeds from sales of foreclosed property	3			18
Net increase in premises and equipment	(16		)	(19		)
Other, net	(1		)	5
Net cash (used in) provided by investing activities	(1,128		)	958
FINANCING ACTIVITIES
Net change in:
Deposits	255			—
Short-term borrowings	(93		)	(52		)
Common stock:
Repurchases	(80		)	(74		)
Cash dividends paid	(31		)	(29		)
Issuances under employee stock plans	26			5
Excess tax benefits from share-based compensation arrangements	5			1
Other, net	1			(5		)
Net cash provided by (used in) financing activities	83			(154		)
Net (decrease) increase in cash and cash equivalents	(831		)	1,063
Cash and cash equivalents at beginning of period	6,451			4,534
Cash and cash equivalents at end of period	$	5,620		$	5,597
Interest paid	$	25		$	29
Income taxes and tax-related interest paid	—			1
Noncash investing and financing activities:
Loans transferred to other real estate	7			5

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 three months ended March 31, 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.

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 a $13 million increase to both "other noninterest income" and "provision for income taxes" for the three months ended March 31, 2013. 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.

5

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 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

6

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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.

7

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 $3 million at March 31, 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 March 31, 2014, the fair value of the contract was a liability of $2 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 March 31, 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 16 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

8

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 March 31, 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 $48 million at both March 31, 2014 and December 31, 2013, and its investment in FRB stock totaled $85 million at both March 31, 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 March 31, 2014 and December 31, 2013.

(in millions)	Total		Level 1		Level 2		Level 3
March 31, 2014
Trading securities:
Deferred compensation plan assets	$	97	$	97	$	—	$	—
Equity and other non-debt securities	1		1		—		—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	1		—		1		—
Corporate debt securities	1		—		1		—
Total trading securities	103		98		5		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	9,123		—		9,123		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	54		—		53		1		(b)
Equity and other non-debt securities	242		124		—		118		(b)
Total investment securities available-for-sale	9,487		169		9,176		142
Derivative assets:
Interest rate contracts	358		—		358		—
Energy derivative contracts	103		—		103		—
Foreign exchange contracts	18		—		18		—
Warrants	3		—		—		3
Total derivative assets	482		—		479		3
Total assets at fair value	$	10,072	$	267	$	9,660	$	145
Derivative liabilities:
Interest rate contracts	$	118	$	—	$	118	$	—
Energy derivative contracts	101		—		101		—
Foreign exchange contracts	17		—		17		—
Other	2		—		—		2
Total derivative liabilities	238		—		236		2
Deferred compensation plan liabilities	97		97		—		—
Total liabilities at fair value	$	335	$	97	$	236	$	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.

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 the three months ended March 31, 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 months ended March 31, 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
Three Months Ended March 31, 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		1		(c)	—			5		(b)	(24		)	118
Total investment securities available-for-sale	159		1		(c)	—			6		(b)	(24		)	142
Derivative assets:
Warrants	3		—			1		(d)	—			(1		)	3
Derivative liabilities:
Other	2		—			—			—			—			2
Three Months Ended March 31, 2013
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)	156		—			—			1		(b)	(4		)	153
Total investment securities available-for-sale	180		—			—			1		(b)	(4		)	177
Derivative assets:
Warrants	3		1		(d)	—			—			(1		)	3
Derivative liabilities:
Other	1		—			—			—			—			1

(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 March 31, 2014 and December 31, 2013 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at March 31, 2014 and December 31, 2013.

(in millions)	Level 3
March 31, 2014
Loans:
Commercial	$	20
Real estate construction	17
Commercial mortgage	74
Total loans	111
Nonmarketable equity securities	2
Other real estate	3
Total assets at fair value	$	116
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 March 31, 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 March 31, 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 the low interest rate environment continuing into 2015. The March 31, 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)
March 31, 2014
State and municipal securities (a)	$	23	4% - 9%	1 - 4
Equity and other non-debt securities (a)	118		5% - 7%	1 - 3
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
March 31, 2014
Assets
Cash and due from banks	$	1,186		$	1,186		$	1,186	$	—	$	—
Interest-bearing deposits with banks	4,434			4,434			4,434		—		—
Loans held-for-sale	2			2			—		2		—
Total loans, net of allowance for loan losses (a)	45,895			45,932			—		—		45,932
Customers’ liability on acceptances outstanding	12			12			12		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	133			133			133		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,955			23,955			—		23,955		—
Interest-bearing deposits	24,696			24,696			—		24,696		—
Customer certificates of deposit	5,099			5,090			—		5,090		—
Total deposits	53,750			53,741			—		53,741		—
Short-term borrowings	160			160			160		—		—
Acceptances outstanding	12			12			12		—		—
Medium- and long-term debt	3,534			3,527			—		3,527		—
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 $111 million and $128 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2014 and December 31, 2013, respectively.

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

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
March 31, 2014
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,133		107		117		9,123
State and municipal securities	24		—		1		23
Corporate debt securities	54		—		—		54
Equity and other non-debt securities	245		1		4		242
Total investment securities available-for-sale (b)	$	9,501	$	108	$	122	$	9,487
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 $146 million and $142 million, respectively, as of March 31, 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 March 31, 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
March 31, 2014
Residential mortgage-backed securities (a)	$	4,797	$	111	$	138	$	6		$	4,935	$	117
State and municipal securities (b)	—		—		23		1			23		1
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		130		4			130		4
Total impaired securities	$	4,797	$	111	$	292	$	11		$	5,089	$	122
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 March 31, 2014, the Corporation had 169 securities in an unrealized loss position with no credit impairment, including 103 residential mortgage-backed securities, 48 equity and other non-debt auction-rate preferred securities, 17 state and municipal auction-rate securities, one corporate auction-rate debt security and one mutual fund. As of March 31, 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 March 31, 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 gains of $1 million and no losses for the three months ended March 31, 2014. No securities gains or losses were recognized for the three months ended March 31, 2013. Securities gains and losses are recorded in “net securities gains” on the consolidated statements of comprehensive income, computed based on the adjusted cost of the specific security.

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)
March 31, 2014	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	155	$	155
After one year through five years	268		269
After five years through ten years	277		287
After ten years	8,556		8,534
Subtotal	9,256		9,245
Equity and other non-debt securities	245		242
Total investment securities available-for-sale	$	9,501	$	9,487

Included in the contractual maturity distribution in the table above were auction-rate securities with a total amortized cost and fair value of $25 million and $24 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 March 31, 2014, investment securities with a carrying value of $3.3 billion were pledged where permitted or required by law to secure $2.3 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
March 31, 2014
Business loans:
Commercial	$	30	$	20	$	3	$	53	$	54	$	29,667	$	29,774
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		18		1,489		1,507
Other business lines (b)	—		—		—		—		1		339		340
Total real estate construction	—		—		—		—		19		1,828		1,847
Commercial mortgage:
Commercial Real Estate business line (a)	25		—		1		26		58		1,736		1,820
Other business lines (b)	40		3		4		47		104		6,830		6,981
Total commercial mortgage	65		3		5		73		162		8,566		8,801
Lease financing	—		—		—		—		—		849		849
International	6		3		—		9		—		1,241		1,250
Total business loans	101		26		8		135		235		42,151		42,521
Retail loans:
Residential mortgage	15		1		—		16		48		1,687		1,751
Consumer:
Home equity	6		3		1		10		32		1,491		1,533
Other consumer	2		—		1		3		2		679		684
Total consumer	8		3		2		13		34		2,170		2,217
Total retail loans	23		4		2		29		82		3,857		3,968
Total loans	$	124	$	30	$	10	$	164	$	317	$	46,008	$	46,489
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 $5 million at both March 31, 2014 and 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
March 31, 2014
Business loans:
Commercial	$	28,427	$	601	$	692	$	54	$	29,774
Real estate construction:
Commercial Real Estate business line (e)	1,463		13		13		18		1,507
Other business lines (f)	339		—		—		1		340
Total real estate construction	1,802		13		13		19		1,847
Commercial mortgage:
Commercial Real Estate business line (e)	1,647		68		47		58		1,820
Other business lines (f)	6,530		137		210		104		6,981
Total commercial mortgage	8,177		205		257		162		8,801
Lease financing	845		3		1		—		849
International	1,233		9		8		—		1,250
Total business loans	40,484		831		971		235		42,521
Retail loans:
Residential mortgage	1,696		1		6		48		1,751
Consumer:
Home equity	1,492		2		7		32		1,533
Other consumer	678		2		2		2		684
Total consumer	2,170		4		9		34		2,217
Total retail loans	3,866		5		15		82		3,968
Total loans	$	44,350	$	836	$	986	$	317	$	46,489
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)	March 31, 2014		December 31, 2013
Nonaccrual loans	$	317	$	350
Reduced-rate loans (a)	21		24
Total nonperforming loans	338		374
Foreclosed property	14		9
Total nonperforming assets	$	352	$	383

(a) Reduced-rate business loans totaled $4 million at both March 31, 2014 and December 31, 2013, and reduced-rate retail loans totaled $17 million and $20 million at March 31, 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 March 31,
Allowance for loan losses:
Balance at beginning of period	$	531		$	67		$	598		$	552		$	77		$	629
Loan charge-offs	(27		)	(3		)	(30		)	(34		)	(4		)	(38		)
Recoveries on loans previously charged-off	16			2			18			12			2			14
Net loan charge-offs	(11		)	(1		)	(12		)	(22		)	(2		)	(24		)
Provision for loan losses	10			(2		)	8			14			(2		)	12
Balance at end of period	$	530		$	64		$	594		$	544		$	73		$	617
As a percentage of total loans	1.25		%	1.62		%	1.28		%	1.32		%	1.97		%	1.37		%
March 31
Allowance for loan losses:
Individually evaluated for impairment	$	39		$	—		$	39		$	60		$	—		$	60
Collectively evaluated for impairment	491			64			555			484			73			557
Total allowance for loan losses	$	530		$	64		$	594		$	544		$	73		$	617
Loans:
Individually evaluated for impairment	$	204		$	49		$	253		$	355		$	42		$	397
Collectively evaluated for impairment	42,315			3,916			46,231			40,964			3,677			44,641
PCI loans (a)	2			3			5			24			5			29
Total loans evaluated for impairment	$	42,521		$	3,968		$	46,489		$	41,343		$	3,724		$	45,067

(a)    No allowance for loan losses was required for PCI loans at March 31, 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 March 31,
(in millions)	2014		2013
Balance at beginning of period	$	36	$	32
Provision for credit losses on lending-related commitments	1		4
Balance at end of period	$	37	$	36

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
March 31, 2014
Business loans:
Commercial	$	13	$	38	$	51	$	95	$	8
Real estate construction:
Commercial Real Estate business line (a)	—		18		18		21		3
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		18		18		22		3
Commercial mortgage:
Commercial Real Estate business line (a)	—		65		65		108		13
Other business lines (b)	1		68		69		95		15
Total commercial mortgage	1		133		134		203		28
International	1		—		1		1		—
Total business loans	15		189		204		321		39
Retail loans:
Residential mortgage	32		—		32		38		—
Consumer:
Home equity	13		—		13		19		—
Other consumer	4		—		4		6		—
Total consumer	17		—		17		25		—
Total retail loans (c)	49		—		49		63		—
Total individually evaluated impaired loans	$	64	$	189	$	253	$	384	$	39
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 March 31,
Business loans:
Commercial	$	62	$	—	$	114	$	1
Real estate construction:
Commercial Real Estate business line (a)	19		—		27		—
Commercial mortgage:
Commercial Real Estate business line (a)	62		—		96		—
Other business lines (b)	67		1		124		—
Total commercial mortgage	129		1		220		—
Lease financing	—		—		1		—
International	3		—		—		—
Total business loans	213		1		362		1
Retail loans:
Residential mortgage	34		—		37		—
Consumer loans:
Home equity	12		—		6		—
Other consumer	4		—		4		—
Total consumer	16		—		10		—
Total retail loans	50		—		47		—
Total individually evaluated impaired loans	$	263	$	1	$	409	$	1

(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 March 31, 2014 and 2013 of loans considered to be TDRs that were restructured during the three months ended March 31, 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)			AB Note Restructures (b)		Total Modifications
Three Months Ended March 31
Business loans:
Commercial	$	1		$	—	$	1	$	7		$	—	$	7
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		16			—		16
Other business lines (d)	8			—		8		6			11		17
Total commercial mortgage	8			—		8		22			11		33
International	1			—		1		—			—		—
Total business loans	10			—		10		29			11		40
Retail loans:
Residential mortgage	—			—		—		1		(e)	—		1
Consumer:
Home equity	1		(e)	1		2		1		(e)	—		1
Other consumer	—			—		—		1		(e)	—		1
Total consumer	1			1		2		2			—		2
Total retail loans	1			1		2		3			—		3
Total loans	$	11		$	1	$	12	$	32		$	11	$	43

(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 March 31, 2014 and December 31, 2013, commitments to lend additional funds to borrowers whose terms have been modified in TDRs totaled $4 million.

The majority of the modifications considered to be TDRs that occurred during the three months ended March 31, 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 three months ended March 31, 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.

22

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table presents information regarding the recorded balance at March 31, 2014 and 2013 of loans modified by principal deferral during the twelve months ended March 31, 2014 and 2013, and those principal deferrals which experienced a subsequent default during the three months ended March 31, 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 March 31			Subsequent Default in the Three Months Ended March 31		Balance at March 31			Subsequent Default in the Three Months Ended March 31
Principal deferrals:
Business loans:
Commercial	$	13		$	2	$	12		$	1
Real estate construction:
Commercial Real Estate business line (a)	—			—		1			—
Commercial mortgage:
Commercial Real Estate business line (a)	17			—		36			16
Other business lines (b)	12			—		17			4
Total commercial mortgage	29			—		53			20
International	1			—		—			—
Total business loans	43			2		66			21
Retail loans:
Residential mortgage	3		(c)	—		5		(c)	—
Consumer:
Home equity	6		(c)	—		4		(c)	—
Other consumer	2		(c)	—		2		(c)	—
Total consumer	8			—		6			—
Total retail loans	11			—		11			—
Total principal deferrals	$	54		$	2	$	77		$	21

(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 March 31, 2014 and 2013, loans with a carrying value of $6 million and $4 million, respectively, were modified by interest rate reduction and loans with a carrying value of $8 million and $30 million, respectively, 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 months ended March 31, 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 March 31, 2014 and December 31, 2013. The nonaccretable yield on PCI loans was $9 million at March 31, 2014. The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at March 31, 2014 and December 31, 2013 were as follows.

(in millions)	March 31, 2014		December 31, 2013
Acquired PCI loans:
Carrying amount	$	5	$	5
Outstanding balance (principal and unpaid interest)	35		46

23

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Changes in the accretable yield for acquired PCI loans for the three months ended March 31, 2014 and 2013 were as follows.

	Three Months Ended March 31,
(in millions)	2014			2013
Balance at beginning of period	$	15		$	16
Reclassifications from nonaccretable	5			—
Accretion	(9		)	(4		)
Balance at end of period	$	11		$	12

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 March 31, 2014, counterparties with bilateral collateral agreements had pledged $117 million of marketable investment securities and deposited $3 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had pledged $8 million of investment securities and posted $19 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 March 31, 2014 was $7 million, for which the Corporation had pledged collateral of $3 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 March 31, 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

24

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 March 31, 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.

	March 31, 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	$	1,450	$	191		$	—		$	1,450	$	198		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	446		1			1			253		1			—
Total risk management purposes	1,896		192			1			1,703		199			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	268		—			1			277		—			1
Caps and floors purchased	268		1			—			277		1			—
Swaps	11,282		166			117			11,143		181			132
Total interest rate contracts	11,818		167			118			11,697		182			133
Energy contracts:
Caps and floors written	1,180		1			43			1,325		1			48
Caps and floors purchased	1,180		43			1			1,325		48			1
Swaps	2,589		59			57			2,724		56			53
Total energy contracts	4,949		103			101			5,374		105			102
Foreign exchange contracts:
Spot, forwards, options and swaps	2,030		17			16			1,764		14			14
Total customer-initiated and other activities	18,797		287			235			18,835		301			249
Total gross derivatives	$	20,693	479			236			$	20,538	500			249
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(166		)	(166		)			(187		)	(187		)
Netting adjustment - Cash collateral received/posted			(1		)	(17		)			(2		)	(10		)
Net derivatives included in the consolidated balance sheets (b)			312			53					311			52
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(114		)	(8		)			(138		)	(10		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	198		$	45				$	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 totaled $2 million at both March 31, 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 March 31, 2014 and 2013. The Corporation recognized an insignificant amount of net gains (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 both the three-month periods ended March 31, 2014 and 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 both the three months ended March 31, 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 March 31, 2014 and December 31, 2013.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
March 31, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,450	3.2	5.45	%	0.35	%
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 March 31, 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 an insignificant amount of net gains in “other noninterest income” in the consolidated statements of comprehensive income for both the three-month periods ended March 31, 2014 and 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 March 31,
(in millions)	Location of Gain	2014		2013
Interest rate contracts	Other noninterest income	$	4	$	3
Energy contracts	Other noninterest income	—		1
Foreign exchange contracts	Foreign exchange income	9		9
Total		$	13	$	13

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)	March 31, 2014		December 31, 2013
Unused commitments to extend credit:
Commercial and other	$	26,925	$	27,728
Bankcard, revolving check credit and home equity loan commitments	1,923		1,889
Total unused commitments to extend credit	$	28,848	$	29,617
Standby letters of credit	$	4,171	$	4,297
Commercial letters of credit	96		103
Other credit-related financial instruments	2		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 March 31, 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 $37 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 $25 million and $28 million at March 31, 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 2020. 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 $250 million and $259 million, respectively, of the $4.3 billion and $4.4 billion standby and commercial letters of credit outstanding at March 31, 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 $65 million at March 31, 2014, including $53 million in deferred fees and $12 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 March 31, 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)	March 31, 2014			December 31, 2013
Total criticized standby and commercial letters of credit	$	92		$	69
As a percentage of total outstanding standby and commercial letters of credit	2.2		%	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 March 31, 2014 and December 31, 2013, the total notional amount of the credit risk participation agreements was approximately $583 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 $6 million and $7 million at March 31, 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 March 31, 2014, the weighted average remaining maturity of outstanding credit risk participation agreements was 2.5 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 $2 million at both March 31, 2014 and December 31, 2013.

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 March 31, 2014 was limited to approximately $381 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 March 31, 2014 was limited to approximately $13 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 ($136 million at March 31, 2014). Amortization and other write-downs of LIHTC investments are presented on a net basis as a component of the

29

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

"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 three months ended March 31, 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 March 31,
(in millions)	2014			2013
Other noninterest income:
Amortization of other tax credit investments	$	(2	)	$	(1	)
Provision for income taxes:
Amortization of LIHTC investments	14			13
Low income housing tax credits	(14		)	(14		)
Other tax benefits related to tax credit entities	(6		)	(5		)
Total provision for income taxes	$	(6	)	$	(6	)

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)	March 31, 2014		December 31, 2013
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	315	$	318
Medium-term notes:
3.00% notes due 2015	299		299
Total parent company	614		617
Subsidiaries
Subordinated notes:
5.70% subordinated notes due 2014 (a)	252		255
5.75% subordinated notes due 2016 (a)	678		681
5.20% subordinated notes due 2017 (a)	561		566
8.375% subordinated notes due 2024 (callable at par in 2014)	183		183
7.875% subordinated notes due 2026 (a)	218		213
Total subordinated notes	1,892		1,898
Federal Home Loan Bank advance:
Floating-rate based on LIBOR indices due 2014	1,000		1,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	28		28
Total subsidiaries	2,920		2,926
Total medium- and long-term debt	$	3,534	$	3,543

(a) The carrying value of medium- and long-term debt has been adjusted to reflect the gain 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 collateralized by mortgage-related assets to its members. FHLB advances bear interest at variable rates based on LIBOR and were secured by a blanket lien on $14 billion of real estate-related loans at March 31, 2014.

30

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 three months ended March 31, 2014 and 2013, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Three Months Ended March 31,
(in millions)	2014			2013
Accumulated net unrealized (losses) gains 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	94			(18		)
Less: Provision (benefit) for income taxes	33			(7		)
Net unrealized holding gains (losses) arising during the period, net of tax	61			(11		)
Less:
Net realized gains included in net securities gains	1			—
Less: Provision for income taxes	—			—
Reclassification adjustment for net securities gains included in net income, net of tax	1			—
Change in net unrealized (losses) gains on investment securities available-for-sale, net of tax	60			(11		)
Balance at end of period, net of tax	$	(8	)	$	139
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(323	)	$	(563	)
Net defined benefit pension and other postretirement plans adjustment arising during the period, net of tax	—			—
Less:
Amortization of actuarial net loss	(10		)	(21		)
Amortization of prior service cost	—			(1		)
Amounts recognized in employee benefits expense	(10		)	(22		)
Less: Benefit for income taxes	(4		)	(8		)
Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax	(6		)	(14		)
Change in defined benefit pension and other postretirement plans adjustment, net of tax	6			14
Balance at end of period, net of tax	$	(317	)	$	(549	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(325	)	$	(410	)

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 March 31,
(in millions, except per share data)	2014		2013
Basic and diluted
Net income	$	139	$	134
Less:
Income allocated to participating securities	2		2
Net income attributable to common shares	$	137	$	132
Basic average common shares	180		185
Basic net income per common share	$	0.76	$	0.71
Basic average common shares	180		185
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	2		—
Net effect of the assumed exercise of warrants	5		2
Diluted average common shares	187		187
Diluted net income per common share	$	0.73	$	0.70

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 March 31,
(shares in millions)	2014	2013
Average outstanding options	8.7	15.1
Range of exercise prices	$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 March 31,
(in millions)	2014			2013
Service cost	$	7		$	9
Interest cost	22			19
Expected return on plan assets	(33		)	(33		)
Amortization of prior service cost	1			1
Amortization of net loss	8			19
Net periodic defined benefit cost	$	5		$	15

Non-Qualified Defined Benefit Pension Plan	Three Months Ended March 31,
(in millions)	2014			2013
Service cost	$	1		$	1
Interest cost	2			3
Amortization of prior service cost (credit)	(1		)	—
Amortization of net loss	2			2
Net periodic defined benefit cost	$	4		$	6

32

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Postretirement Benefit Plan	Three Months Ended March 31,
(in millions)	2014			2013
Interest cost	$	1		$	1
Expected return on plan assets	(1		)	(1		)
Net periodic postretirement benefit cost	$	—		$	—

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

Net unrecognized tax benefits were $11 million at both March 31, 2014 and December 31, 2013. 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 $7 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 March 31, 2014 and December 31, 2013.

Net deferred tax assets were $224 million at March 31, 2014, compared to $256 million at December 31, 2013. The decrease of $32 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 March 31, 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

Comerica Bank, a wholly owned subsidiary of the Corporation, was named a third-party defendant in Butte Local Development v. Masters Group v. Comerica Bank (“the case”), a lender liability case filed on November 16, 2011. The jury trial commenced January 6, 2014, in the Montana Second District Judicial Court for Silver Bow County in Butte, Montana ("the court"). The claims underlying the case against the Bank grew out of an initial, two-year $9 million revolving line of credit loan extended by the Bank to Masters in July 2006. The loan was subsequently increased to $10.5 million and expired by its terms in July 2008 and was later paid in full through collection actions initiated by the Bank in December 2008, following a default by Masters. Masters alleged that the Bank wrongfully collected the loan, causing Masters to cease operations, and claimed that as a result, they failed to repay a $200,000 loan that they owed to Butte Local Development (“BLD”). Masters did not dispute that it was required to repay the $10.5 million loan, but contended the Bank should have continued to give it more time.

Starting in July 2013, the Bank attempted to settle the case by offering to pay the debt owed by Masters to BLD. The Bank anticipated that such a settlement would improve the Bank's chances of defending the case in Federal court, the court in which Masters would have been required to sue the Bank, absent BLD’s claim. Those discussions and consideration of the settlement offer continued for several months. Accordingly, on September 30, 2013, the Corporation believed that a nominal loss was probable and recorded legal reserves for the settlement offer made to BLD.

On January 17, 2014, a jury awarded Masters $52 million for its claims against the Bank. The jury also awarded BLD $275,000 for its claims against Masters. 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.

On January 23, 2014, Masters filed motions for additional claims against the Corporation related to the case seeking court costs, pre-judgment interest, punitive damages above the statutory maximum permitted by the State of Montana and attorneys' fees. In March 2014, the court declined to increase the punitive damage award against the Bank above the amount awarded by the jury and declined the request by Masters for a percentage of the jury award in attorney's fees and instead allowed fees based on

33

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

hourly rates. The Corporation stipulated to $2 million of attorney's fees and costs but reserved the right to appeal Masters' entitlement to such fees and costs. The Corporation accordingly increased its reserve related to the case to $54 million.

Masters filed a notice of their intent to appeal certain aspects of the court's ruling. The Corporation believes that it has meritorious defenses for this litigation and has appealed the jury's decision and certain rulings on the case, including the award for attorneys' fees, to the Montana Supreme Court, the sole appellate court for the state of Montana.

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 $5 million and $8 million were included in "other noninterest expenses" on the consolidated statements of income for the three months ended March 31, 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 $85 million at March 31, 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 March 31, 2014.

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.

34

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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
Three Months Ended March 31, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	371		$	146		$	46		$	(158	)	$	6		$	411
Provision for credit losses	16			2			(8		)	—			(1		)	9
Noninterest income	87			41			64			14			2			208
Noninterest expenses	146			171			78			3			8			406
Provision (benefit) for income taxes (FTE)	98			5			14			(55		)	3			65
Net income (loss)	$	198		$	9		$	26		$	(92	)	$	(2	)	$	139
Net credit-related charge-offs (recoveries)	$	11		$	4		$	(3	)	$	—		$	—		$	12
Selected average balances:
Assets	$	35,896		$	6,052		$	4,939		$	11,129		$	6,692		$	64,708
Loans	34,927			5,381			4,767			—			—			45,075
Deposits	27,023			21,361			3,816			353			217			52,770
Statistical data:
Return on average assets (a)	2.20		%	0.16		%	2.15		%	N/M			N/M			0.86		%
Efficiency ratio (b)	31.96			91.44			71.31			N/M			N/M			65.79

35

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Three Months Ended March 31, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	155		$	46		$	(167	)	$	7		$	416
Provision for credit losses	20			6			(6		)	—			(4		)	16
Noninterest income	90			41			65			14			3			213
Noninterest expenses	146			175			79			3			13			416
Provision (benefit) for income taxes (FTE)	101			5			13			(58		)	2			63
Net income (loss)	$	198		$	10		$	25		$	(98	)	$	(1	)	$	134
Net credit-related charge-offs	$	16		$	8		$	—		$	—		$	—		$	24
Selected average balances:
Assets	$	35,780		$	5,973		$	4,738		$	11,747		$	5,213		$	63,451
Loans	34,753			5,276			4,588			—			—			44,617
Deposits	25,514			21,049			3,682			275			172			50,692
Statistical data:
Return on average assets (a)	2.21		%	0.18		%	2.12		%	N/M			N/M			0.84		%
Efficiency ratio (b)	31.38			89.37			71.09			N/M			N/M			66.15

(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 March 31, 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
Three Months Ended March 31, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	183		$	172		$	136		$	72		$	(152	)	$	411
Provision for credit losses	3			11			6			(10		)	(1		)	9
Noninterest income	87			34			31			40			16			208
Noninterest expenses	161			96			90			48			11			406
Provision (benefit) for income taxes (FTE)	38			36			25			18			(52		)	65
Net income (loss)	$	68		$	63		$	46		$	56		$	(94	)	$	139
Net credit-related charge-offs (recoveries)	$	—		$	10		$	6		$	(4	)	$	—		$	12
Selected average balances:
Assets	$	13,819		$	15,133		$	11,070		$	6,865		$	17,821		$	64,708
Loans	13,473			14,824			10,364			6,414			—			45,075
Deposits	20,642			14,782			10,875			5,901			570			52,770
Statistical data:
Return on average assets (a)	1.26		%	1.59		%	1.50		%	3.28		%	N/M			0.86		%
Efficiency ratio (b)	59.71			46.72			53.83			43.39			N/M			65.79

36

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended March 31, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	190		$	171		$	134		$	81		$	(160	)	$	416
Provision for credit losses	(7		)	21			8			(2		)	(4		)	16
Noninterest income	92			35			31			38			17			213
Noninterest expenses	168			97			91			44			16			416
Provision (benefit) for income taxes (FTE)	43			32			23			21			(56		)	63
Net income (loss)	$	78		$	56		$	43		$	56		$	(99	)	$	134
Net credit-related charge-offs	$	5		$	10		$	6		$	3		$	—		$	24
Selected average balances:
Assets	$	14,042		$	13,795		$	10,795		$	7,859		$	16,960		$	63,451
Loans	13,650			13,542			10,071			7,354			—			44,617
Deposits	20,254			14,356			9,959			5,676			447			50,692
Statistical data:
Return on average assets (a)	1.47		%	1.45		%	1.54		%	2.86		%	N/M			0.84		%
Efficiency ratio (b)	59.53			47.04			54.99			37.41			N/M			66.15

(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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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" 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.

38

RESULTS OF OPERATIONS

Net income for the three months ended March 31, 2014 was $139 million, an increase of $5 million from $134 million reported for the three months ended March 31, 2013. This increase was primarily the result of decreases of $10 million in noninterest expenses and $7 million in the provision for credit losses, partially offset by decreases of $6 million in net interest income and $5 million in noninterest income. Net income per diluted common share was $0.73 for the three months ended March 31, 2014, compared to $0.70 for the same period one year ago. Average diluted common shares were 187 million for both the three-month periods ended March 31, 2014 and 2013.

Full-Year 2014 Outlook Compared to Full-Year 2013

Management expectations for full-year 2014 compared to 2013, assuming a continuation of the current economic and low rate environment, are as follows:

• Average loan growth consistent with 3 percent growth achieved in 2013, reflecting stabilization in Mortgage Banker Finance near average fourth quarter 2013 level and continued focus on pricing and structure discipline.

• Net interest income modestly lower, reflecting a decline in purchase accounting accretion, to $20 million to $30 million, and the effect of continued pressure from the low rate environment, partially offset by loan growth.

• Provision for credit losses and net charge-offs stable. Increases to the allowance for credit losses due to loan growth offset by continued strong credit quality.

• Noninterest income modestly lower, reflecting stable customer-driven fee income and lower noncustomer-driven income. Growth in fiduciary income and card fees offset by lower capital market activity.

• Noninterest expenses lower, reflecting lower litigation-related expenses and a more than 50 percent decrease in pension expense, to $35 million to $40 million.

• Income tax expense to approximate 32 percent of pre-tax income, reflecting the change in accounting for affordable housing projects that qualify for the low-income housing tax credit described below. The impact of the increase in the effective tax rate is fully offset by a related increase in noninterest income, resulting in no impact to net income.

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 $13 million for the three months ended March 31, 2013 ($56 million for full-year 2013). The adoption had no impact on net income for any period presented.

Net Interest Income

Net interest income was $410 million for the three months ended March 31, 2014, a decrease of $6 million compared to $416 million for the three months ended March 31, 2013. The decrease in net interest income resulted primarily from a decrease in yields on earning assets, partially offset by a the benefit provided by a decrease in funding costs and an increase in average earning assets. Average earning assets increased $1.3 billion, or 2 percent, to $59.9 billion for the three months ended March 31, 2014, compared to $58.6 billion for the same period in 2013. The increase in average earning assets primarily reflected increases of $1.6 billion in average interest-bearing deposits with banks and $458 million in average loans, partially offset by a decrease of $739 million in average investment securities available-for-sale. The net interest margin (FTE) for the three months ended March 31, 2014 decreased 11 basis points to 2.77 percent, from 2.88 percent for the comparable period in 2013, primarily from decreased yields on loans and the impact of an increase in excess liquidity, partially offset by lower deposit rates and improved yields on mortgage-backed investment securities. The decrease in loan yields was primarily the result of the impact of a lower rate environment, repayments on higher-yielding loans, positive credit quality migration throughout the portfolio and shifts in the average loan portfolio mix. Yields on mortgage-backed investment securities increased primarily due to decreased premium amortization resulting from slower prepayment speeds, largely reflecting the cumulative impact of a retrospective adjustment made in the three months ended March 31, 2014. Excess liquidity reduced the net interest margin by approximately 24 basis points and 17 basis points in the three months ended March 31, 2014 and 2013, respectively. Excess liquidity was represented by $5.3 billion and $3.7 billion of average balances deposited with the Federal Reserve Bank (FRB) in the three months ended March 31, 2014 and 2013, respectively, included in “interest-bearing deposits with banks” on the consolidated balance sheets. The "Quarterly Analysis of Net Interest Income & Rate/Volume - Fully Taxable Equivalent" table above provides an analysis of net interest income (FTE) for the three months ended March 31, 2014 and 2013 and details the components of the change in net interest income on a FTE basis for the three months ended March 31, 2014 compared to the same period in the prior year.

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.

39

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

	Three Months Ended
	March 31, 2014							March 31, 2013
(dollar amounts in millions)	Average Balance			Interest		Average Rate		Average Balance			Interest		Average Rate
Commercial loans	$	28,362		$	221	3.17	%	$	28,056		$	229	3.31	%
Real estate construction loans	1,827			15		3.40		1,314			13		4.15
Commercial mortgage loans	8,770			86		3.97		9,398			95		4.08
Lease financing	848			9		4.07		857			7		3.23
International loans	1,301			12		3.68		1,282			11		3.62
Residential mortgage loans	1,724			17		3.86		1,556			17		4.39
Consumer loans	2,243			17		3.16		2,154			18		3.36
Total loans (a)	45,075			377		3.39		44,617			390		3.54
Mortgage-backed securities available-for-sale	8,911			55		2.42		9,635			53		2.25
Other investment securities available-for-sale	371			—		0.43		386			—		0.50
Total investment securities available-for-sale	9,282			55		2.34		10,021			53		2.17
Interest-bearing deposits with banks (b)	5,448			4		0.26		3,852			2		0.27
Other short-term investments	111			—		0.66		117			1		2.30
Total earning assets	59,916			436		2.94		58,607			446		3.09
Cash and due from banks	913							979
Allowance for loan losses	(603		)					(633		)
Accrued income and other assets	4,482							4,498
Total assets	$	64,708						$	63,451
Money market and interest-bearing checking deposits	$	22,261		6		0.11		$	21,294		7		0.14
Savings deposits	1,700			—		0.03		1,623			—		0.03
Customer certificates of deposit	5,109			5		0.36		5,744			7		0.47
Foreign office time deposits	464			—		0.42		525			1		0.55
Total interest-bearing deposits	29,534			11		0.15		29,186			15		0.21
Short-term borrowings	185			—		0.03		123			—		0.11
Medium- and long-term debt	3,545			14		1.53		4,707			15		1.32
Total interest-bearing sources	33,264			25		0.30		34,016			30		0.36
Noninterest-bearing deposits	23,236							21,506
Accrued expenses and other liabilities	979							973
Total shareholders’ equity	7,229							6,956
Total liabilities and shareholders’ equity	$	64,708						$	63,451
Net interest income/rate spread (FTE)				$	411	2.64					$	416	2.73
FTE adjustment				$	1						$	—
Impact of net noninterest-bearing sources of funds						0.13							0.15
Net interest margin (as a percentage of average earning assets) (FTE) (a) (b)						2.77	%						2.88	%

(a) Accretion of the purchase discount on the acquired loan portfolio of $12 million and $11 million increased the net interest margin by 8 basis points for both the three-month periods ended March 31, 2014 and 2013.

(b) Excess liquidity, represented by average balances deposited with the Federal Reserve Bank, reduced the net interest margin by 24 basis points and 17 basis points in the three months ended March 31, 2014 and 2013, respectively.

40

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

	Three Months Ended
	March 31, 2014/March 31, 2013
(in millions)	Increase (Decrease) Due to Rate			Increase (Decrease) Due to  Volume (a)			Net Increase (Decrease)
Interest Income (FTE):
Loans	$	(16	)	$	3		$	(13	)
Investment securities available-for-sale	5			(3		)	2
Interest-bearing deposits with banks	—			2			2
Other short-term investments	(1		)	—			(1		)
Total interest income (FTE)	(12		)	2			(10		)
Interest Expense:
Interest-bearing deposits	(3		)	(1		)	(4		)
Medium- and long-term debt	3			(4		)	(1		)
Total interest expense	—			(5		)	(5		)
Net interest income (FTE)	$	(12	)	$	7		$	(5	)

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

Provision for Credit Losses

The provision for credit losses was $9 million for the three months ended March 31, 2014, compared to $16 million for the same period in 2013. 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 $8 million for the three months ended March 31, 2014, compared to $12 million for the three months ended March 31, 2013. Credit quality in the loan portfolio continued to improve in the three months ended March 31, 2014, compared to the same period in the prior year. Improvements in credit quality included a decline of $755 million in the Corporation's criticized loan list from March 31, 2013 to March 31, 2014. Reflected in the decline in criticized loans was a decrease in nonaccrual loans of $177 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 March 31, 2014 decreased $12 million to $12 million, or 0.10 percent of average total loans, compared to $24 million, or 0.21 percent, for the three months ended March 31, 2013. The $12 million decrease in net loan charge-offs in the three months ended March 31, 2014, compared to the same period in 2013, reflected decreases in most business lines, with the largest decreases in general Middle Market and Small Business, partially offset by increases in Technology and Life Sciences and Commercial Real Estate.

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 March 31, 2014, compared to $4 million in the three months ended March 31, 2013. The $3 million decrease reflected a $4 million decrease in the provision for unfunded commitments, partially offset by a $1 million increase in the provision for letters of credit. Lending-related commitment charge-offs were insignificant for the three months ended March 31, 2014 and 2013.

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.

41

Noninterest Income

	Three Months Ended March 31,
(in millions)	2014		2013
Customer-driven income:
Service charges on deposit accounts	$	54	$	55
Fiduciary income	44		43
Commercial lending fees	20		21
Card fees	19		17
Letter of credit fees	14		16
Foreign exchange income	9		9
Brokerage fees	5		5
Other customer-driven income (a)	19		20
Total customer-driven noninterest income	184		186
Noncustomer-driven income:
Bank-owned life insurance	9		9
Net securities gains (losses)	1		—
Other noncustomer-driven income (a)	14		18
Total noninterest income	$	208	$	213

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

Noninterest income was $208 million for the three months ended March 31, 2014, a decrease of $5 million compared to $213 million for the same period in 2013. The decrease primarily reflected a $4 million decrease in securities trading income, as shown in the following table, which illustrates certain categories included in "other noninterest income" on the consolidated statements of comprehensive income.

	Three Months Ended March 31,
(in millions)	2014		2013
Other noninterest income:
Other customer-driven income:
Investment banking fees	$	4	$	5
All other customer-driven income	15		15
Total other customer-driven income	19		20
Other noncustomer-driven income:
Securities trading income	1		5
Deferred compensation asset returns (a)	2		3
All other noncustomer-driven income	11		10
Total other noncustomer-driven income	14		18
Total other noninterest income	$	33	$	38

(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 expense.

Noninterest Expenses

	Three Months Ended March 31,
(in millions)	2014		2013
Salaries and benefits expense	$	247	$	251
Net occupancy expense	40		39
Equipment expense	14		15
Outside processing fee expense	28		28
Software expense	22		22
Litigation-related expense	3		3
FDIC insurance expense	8		9
Advertising expense	6		6
Other noninterest expenses	38		43
Total noninterest expenses	$	406	$	416

Noninterest expenses were $406 million for the three months ended March 31, 2014, a decrease of $10 million compared to $416 million for the three months ended March 31, 2013. The decrease primarily reflected a $4 million decrease in salaries and

42

benefits expense and small decreases in several other categories of noninterest expense. Salaries and benefits expense decreased primarily due to a decrease in pension expense, partially offset by increases in payroll taxes and share-based compensation expense.

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.

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 three months ended March 31, 2014 and 2013.

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

	Three Months Ended March 31,
(dollar amounts in millions)	2014					2013
Business Bank	$	198		85	%	$	198		85	%
Retail Bank	9			4		10			4
Wealth Management	26			11		25			11
	233			100	%	233			100	%
Finance	(92		)			(98		)
Other (a)	(2		)			(1		)
Total	$	139				$	134

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

The Business Bank's net income of $198 million for the three months ended March 31, 2014 was unchanged compared to the three months ended March 31, 2013. Net interest income (FTE) of $371 million decreased $4 million in the three months ended March 31, 2014, primarily due to lower loan yields, partially offset by an increase in accretion of the purchase discount on the acquired loan portfolio, the benefit provided by an increase of $174 million in average loans and a decrease in net funds transfer pricing (FTP) charges. Average deposits increased $1.5 billion. The provision for credit losses decreased $4 million to $16 million for the three months ended March 31, 2014, compared to the same period in the prior year, primarily due to improved credit quality. Net credit-related charge-offs of $11 million decreased $5 million in the three months ended March 31, 2014, compared to the three months ended March 31, 2013, primarily reflecting a decrease in general Middle Market, partially offset by increases in Technology and Life Sciences and Commercial Real Estate. Noninterest income of $87 million for the three months ended March 31, 2014 decreased $3 million from the comparable period in the prior year, primarily due to small decreases in several noninterest income categories. Noninterest expenses of $146 million for the three months ended March 31, 2014 were unchanged compared to the same period in the prior year, as a decrease in salaries and benefits expense of $3 million and smaller decreases in several other categories of noninterest expenses were offset by an increase in corporate overhead expense of $4 million.

Net income for the Retail Bank of $9 million for the three months ended March 31, 2014 decreased $1 million, compared to $10 million for the three months ended March 31, 2013. Net interest income (FTE) of $146 million decreased $9 million in the three months ended March 31, 2014, primarily due to a decrease in net FTP credits, lower loan yields and a decrease in accretion of the purchase discount on the acquired loan portfolio, partially offset the benefit provided by a $105 million increase in average loans and lower deposit rates. The provision for credit losses of $2 million and net credit-related charge-offs of $4 million for the three months ended March 31, 2014 each decreased $4 million from the comparable period in the prior year, both primarily reflecting a decrease in Small Business. Noninterest income of $41 million for the three months ended March 31, 2014 was unchanged compared to the three months ended March 31, 2013. Noninterest expenses of $171 million for the three months ended March 31, 2014 decreased $4 million from the comparable period in the prior year, primarily due to a decrease in salaries and benefits expense of $2 million and small decreases in several other noninterest expense categories.

Wealth Management's net income of $26 million for the three months ended March 31, 2014 increased $1 million, compared to $25 million for the three months ended March 31, 2013. Net interest income (FTE) of $46 million for the three months ended March 31, 2014 was unchanged compared to the three months ended March 31, 2013. The benefit provided by a $179

43

million increase in average loans was offset by a decline in loan yields. The provision for credit losses was a benefit of $8 million for the three months ended March 31, 2014, compared to a benefit of $6 million for the three months ended March 31, 2013, primarily due to improvements in credit quality. Net credit-related recoveries were $3 million for the three months ended March 31, 2014, compared to an insignificant amount for the three months ended March 31, 2013. Noninterest income of $64 million decreased $1 million from the comparable period in the prior year, primarily reflecting a $2 million decrease in securities trading income and smaller decreases in several other noninterest income categories, partially offset by a $2 million increase in fiduciary income. Noninterest expenses of $78 million for the three months ended March 31, 2014 decreased $1 million from the three months ended March 31, 2013, primarily due to a $3 million decrease in salaries and benefits expense, partially offset by small increases in several other noninterest expense categories.

The net loss in the Finance segment was $92 million for the three months ended March 31, 2014, compared to a net loss of $98 million for the three months ended March 31, 2013. Net interest expense (FTE) of $158 million for the three months ended March 31, 2014 decreased $9 million, compared to the three months ended March 31, 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 as well as an increase in interest earned on the Corporation's mortgage-backed investment securities.

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 three months ended March 31, 2014 and 2013.

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

	Three Months Ended March 31,
(dollar amounts in millions)	2014					2013
Michigan	$	68		29	%	$	78		34	%
California	63			27		56			24
Texas	46			20		43			18
Other Markets	56			24		56			24
	233			100	%	233			100	%
Finance & Other (a)	(94		)			(99		)
Total	$	139				$	134

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

The Michigan market's net income of $68 million for the three months ended March 31, 2014 decreased $10 million, compared to $78 million for the three months ended March 31, 2013. Net interest income (FTE) of $183 million for the three months ended March 31, 2014 decreased $7 million from the comparable period in the prior year, primarily due to lower loan yields, the impact of a $177 million decrease in average loans and a decrease in net FTP credits, partially offset by lower deposit rates. Average deposits increased $388 million. The provision for credit losses was $3 million for the three months ended March 31, 2014, an increase of $10 million compared to the same period in the prior year, primarily reflecting an increase in Commercial Real Estate. Net credit-related charge-offs were insignificant for the three months ended March 31, 2014, compared to $5 million for the comparable period in the prior year, primarily reflecting decreases in general Middle Market and Small Business, partially offset by an increase in Commercial Real Estate. Noninterest income of $87 million for the three months ended March 31, 2014 decreased $5 million from the comparable period in 2013, primarily reflecting small decreases in several noninterest income categories. Noninterest expenses of $161 million for the three months ended March 31, 2014 decreased $7 million from the comparable period in the prior year, primarily reflecting a decrease of $4 million in salaries and benefits expense and small decreases in several noninterest expense categories.

The California market's net income of $63 million increased $7 million in the three months ended March 31, 2014, compared to $56 million for the three months ended March 31, 2013. Net interest income (FTE) of $172 million for the three months ended March 31, 2014 increased $1 million from the comparable period in the prior year, primarily due to the benefit provided by a $1.3 billion increase in average loans and lower deposit rates, partially offset by lower loan yields. The provision for credit losses of $11 million in the three months ended March 31, 2014 decreased $10 million from the comparable period in the prior year, primarily reflecting a decrease in Technology and Life Sciences. Net credit-related charge-offs of $10 million in the three months ended March 31, 2014 were unchanged compared to the three months ended March 31, 2013. Noninterest income of $34 million and noninterest expenses of $96 million for the three months ended March 31, 2014 each decreased $1 million from the comparable period in prior year, reflecting small decreases in several categories.

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The Texas market's net income increased $3 million to $46 million for the three months ended March 31, 2014, compared to $43 million for the three months ended March 31, 2013. Net interest income (FTE) of $136 million for the three months ended March 31, 2014 increased $2 million from the comparable period in the prior year, primarily due to the benefit provided by a $293 million increase in average loans, a decrease in net FTP charges and lower deposit rates, partially offset by lower loan yields. Average deposits increased $916 million. The provision for credit losses of $6 million for the three months ended March 31, 2014 decreased $2 million from the comparable period in the prior year, primarily reflecting a decrease in Energy, partially offset by an increase in Commercial Real Estate. Net credit-related charge-offs of $6 million for the three months ended March 31, 2014 were unchanged from the comparable period in the prior year. Noninterest income of $31 million for the three months ended March 31, 2014 was unchanged and noninterest expenses of $90 million for the three months ended March 31, 2014 decreased $1 million from the three months ended March 31, 2013, primarily reflecting small decreases in several noninterest expense categories.

Net income in Other Markets of $56 million for the three months ended March 31, 2014 was unchanged from the three months ended March 31, 2013. Net interest income (FTE) of $72 million for the three months ended March 31, 2014 decreased $9 million from the comparable period in the prior year, primarily due to a decrease in average loans of $940 million and lower loan yields. The provision for credit losses decreased $8 million in the three months ended March 31, 2014, compared to the same period in the prior year, primarily reflecting improvements in credit quality and lower loan balances. Net credit-related recoveries were $4 million for the three months ended March 31, 2014 compared to net charge-offs of $3 million for the comparable period in the prior year, primarily reflecting decreases in Environmental Services, Commercial Real Estate and general Middle Market. Noninterest income of $40 million for the three months ended March 31, 2014 increased $2 million from the comparable period in the prior year, reflecting small increases in several noninterest income categories. Noninterest expenses of $48 million for the three months ended March 31, 2014 increased $4 million compared to the same period in the prior year due to small increases in several noninterest expense categories.

The net loss for the Finance & Other category of $94 million in the three months ended March 31, 2014 decreased $5 million compared to the three months ended March 31, 2013. For further information, refer to the Finance segment and Other category discussions under the "Business Segments" subheading above.

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

	March 31,
	2014	2013
Michigan	214	216
Texas	136	137
California	105	105
Other Markets:
Arizona	18	18
Florida	9	10
Canada	1	1
Total	483	487

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FINANCIAL CONDITION

Total assets were $65.7 billion at March 31, 2014, an increase of $457 million from $65.2 billion at December 31, 2013, primarily reflecting increases of $1.0 billion in total loans, $180 million in investment securities available-for-sale and $103 million in accrued income and other assets, partially offset by an $877 million decrease in interest-bearing deposits with banks. On an average basis, total assets increased $103 million to $64.7 billion in the first quarter 2014, compared to $64.6 billion in the fourth quarter 2013, resulting primarily from an increase of $1.0 billion in average loans, largely offset by a decrease of $952 million in average interest-bearing deposits with banks.

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

	Three Months Ended							Percent Change
(dollar amounts in millions)	March 31, 2014		December 31, 2013		Change
Average Loans:
Commercial loans by business line:
General Middle Market	$	10,238	$	9,954	$	284		3	%
National Dealer Services	3,861		3,777		84			2
Energy	2,949		2,725		224			8
Technology and Life Sciences	2,190		1,988		202			10
Environmental Services	821		791		30			4
Entertainment	500		617		(117		)	(19	)
Total Middle Market	20,559		19,852		707			4
Corporate Banking	3,277		3,130		147			5
Mortgage Banker Finance	886		1,109		(223		)	(20	)
Commercial Real Estate	736		760		(24		)	(3	)
Total Business Bank commercial loans	25,458		24,851		607			2
Total Retail Bank commercial loans	1,482		1,431		51			4
Total Wealth Management commercial loans	1,422		1,401		21			2
Total commercial loans	28,362		27,683		679			2
Real estate construction loans	1,827		1,652		175			11
Commercial mortgage loans	8,770		8,714		56			1
Lease financing	848		838		10			1
International loans	1,301		1,303		(2		)	—
Residential mortgage loans	1,724		1,679		45			3
Consumer loans	2,243		2,185		58			3
Total loans	$	45,075	$	44,054	$	1,021		2	%
Average Loans By Geographic Market:
Michigan	$	13,473	$	13,323	$	150		1	%
California	14,824		14,431		393			3
Texas	10,364		9,766		598			6
Other Markets	6,414		6,534		(120		)	(2	)
Total loans	$	45,075	$	44,054	$	1,021		2	%

Average loans for the three months ended March 31, 2014 increased $1.0 billion, compared to the three months ended December 31, 2013, led by increases of $679 million, or 2 percent in average commercial loans and $231 million, or 2 percent in average combined commercial mortgage and real estate construction loans. The $679 million increase in average commercial loans primarily reflected an increase in Middle Market ($707 million), partially offset by a decrease in Mortgage Banker Finance ($223 million). The decline in Mortgage Banker Finance, which provides mortgage warehousing lines, primarily reflected a decline in residential mortgage activity. The increase in Middle Market primarily reflected increases in general Middle Market ($284 million), Energy ($224 million) and Technology and Life Sciences ($202 million), partially offset by a decrease in Entertainment ($117 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 $180 million to $9.5 billion at March 31, 2014, from $9.3 billion at December 31, 2013, primarily reflecting an increase in the pace of purchases replacing paydowns on residential mortgage-backed investment securities in the first quarter of 2014 as well as a $93 million decrease in net unrealized losses, to a net unrealized loss

46

of $14 million at March 31, 2014, compared to a net unrealized loss of $107 million at December 31, 2013. On an average basis, investment securities available-for-sale decreased $83 million in the first quarter 2014, compared to the fourth quarter 2013. Average unrealized losses increased $32 million in the first quarter 2014, compared to the fourth quarter 2013.

Total liabilities increased $324 million to $58.4 billion at March 31, 2014, compared to $58.1 billion at December 31, 2013, primarily due to an increase of $378 million in interest-bearing deposits. On an average basis, total liabilities decreased $116 million in the first quarter 2014, compared to the fourth quarter 2013, primarily due to decreases of $296 million in noninterest-bearing deposits and $94 million in short-term borrowings, partially offset by an increase of $297 million in interest-bearing deposits. The decrease in average noninterest-bearing deposits primarily reflected decreases in Corporate Banking ($540 million) and Private Banking ($126 million), partially offset by an increase Middle Market ($389 million). The increase in Middle Market was driven by an increase in balances in Technology and Life Sciences ($531 million). The increase in average interest-bearing deposits primarily reflected increases of $231 million in money market and interest-bearing checking deposits, largely the result of an increase in Corporate Banking ($232 million), and $31 million in customer certificates of deposit. By geographic market, average total deposits increased in Texas ($339 million) and Michigan ($141 million) and decreased in California ($437 million) and Other Markets ($87 million).

Capital

Total shareholders' equity increased $133 million to $7.3 billion at March 31, 2014, compared to December 31, 2013. The following table presents a summary of changes in total shareholders' equity in the three months ended March 31, 2014.

(in millions)
Balance at January 1, 2014			$	7,150
Net income			139
Cash dividends declared on common stock			(35		)
Purchase of common stock			(80		)
Other comprehensive income:
Investment securities available-for-sale	$	60
Defined benefit and other postretirement plans	6
Total other comprehensive income			66
Issuance of common stock under employee stock plans			29
Share-based compensation			14
Balance at March 31, 2014			$	7,283

The Corporation has a process to periodically conduct 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 Comerica's capital plan and capital distributions contemplated in the plan. Comerica's capital plan provides for up to $236 million in share repurchases for the four-quarter period ending March 31, 2015, as well as the authority to fully redeem $150 million par value of subordinated notes due 2024. The notes are callable at par on or after July 15, 2014 and were recorded at a carrying value of $183 million at March 31, 2014. Due to the lack of certainty about the possible execution and timing of the call, the impact of the call is not reflected in the outlook for 2014. Comerica's capital plan further included a 1-cent increase in the quarterly dividend to $0.20 per common share. The dividend proposal was approved by the Board of Directors on April 22, 2014.

On April 22, 2014, the Board of Directors of the Corporation 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.

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The following table summarizes the Corporation's repurchase activity during the three months ended March 31, 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)
January 2014	578	17,549	756	$	47.12	$	—
February 2014	599	16,950	601	46.35		—
March 2014	346	16,604	346	48.89		—
Total first quarter 2014	1,523	16,604	1,703	$	47.21	$	—

(a) Maximum number of shares and warrants that may yet be purchased under the publicly announced plans or programs. Does not reflect April 22, 2014 share repurchase authorization for up to an additional 2.0 million shares.

(b) Includes approximately 180,000 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 three months ended March 31, 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 three months ended March 31, 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 three months ended March 31, 2014, the Corporation withheld the equivalent of approximately 8,000 shares to cover an aggregate of $235,000 in exercise price and issued approximately 5,000 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.

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:

	March 31, 2014				December 31, 2013
(dollar amounts in millions)	Capital		Ratio		Capital		Ratio
Tier 1 common (a) (b)	$	6,961	10.54	%	$	6,895	10.64	%
Tier 1 risk-based (4.00% - minimum) (b)	6,961		10.54		6,895		10.64
Total risk-based (8.00% - minimum) (b)	8,554		12.95		8,491		13.10
Leverage (3.00% - minimum) (b)	6,961		10.85		6,895		10.77
Tangible common equity (a)	6,632		10.20		6,501		10.07

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

(b) March 31, 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 March 31, 2014 common equity Tier 1 and Tier 1 risk-based ratio would be 10.3 percent if calculated under the final rule, excluding most elements of accumulated other comprehensive income from regulatory capital. The Corporation's March 31, 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.

On October 24, 2013, U.S. banking regulators issued a Notice of Proposed Rulemaking that would implement a quantitative liquidity requirement in the U.S. (the proposed rule) generally consistent with the Liquidity Coverage Ratio (LCR) minimum liquidity measure established under the Basel III liquidity framework. Under the proposed rule, the Corporation would be subject

48

to a modified LCR standard, which requires a financial institution to hold a buffer of high-quality, liquid assets to fully cover net cash outflows under a 21-day systematic liquidity stress scenario. Under the proposal, the LCR rules would be fully phased in on January 1, 2017, with a transition period beginning January 1, 2015. The Corporation is currently evaluating the potential impact of the proposed rule; however, we expect to meet the final requirements adopted by U.S. banking regulators within the required timetable. Uncertainty exists as to the final form and timing of the proposed rule, and balance sheet dynamics may vary in the future. As a result the Corporation may decide to consider additional liquidity management initiatives. 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 NFSR 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.

While the overall credit quality of the loan portfolio was strong in the first quarter 2014, economic uncertainty continued to be a consideration when determining the appropriateness of the allowance for loan losses. Events such as the widespread bad weather in the U.S. in the first quarter 2014 and the volatile geopolitical situation in Eastern Europe added uncertainty, while the U.S. economic outlook appeared to be relatively more favorable.

The allowance for loan losses was $594 million at March 31, 2014, compared to $598 million at December 31, 2013, a decrease of $4 million, or 1 percent. The decrease resulted primarily from a reduction in specific reserves and a decrease in retail reserves, partially offset by higher loan balances. Acquired loans were initially recorded at fair value, which included an estimate of credit losses expected to be realized over the remaining lives of the loans, and therefore no corresponding allowance for loan losses was recorded for these loans at acquisition. Methods utilized to estimate the required allowance for loan losses for acquired loans not deemed credit-impaired at acquisition are similar to originated loans; however, the estimate of loss is based on the unpaid principal balance less the remaining purchase discount, either on an individually evaluated basis or based on the pool of acquired loans not deemed credit-impaired at acquisition within each risk rating, as applicable. At March 31, 2014, there was $17 million of purchase discount remaining, compared to $21 million of purchase discount remaining at December 31, 2013. No allowance for loan losses was required on acquired loans for either period.

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 an 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 the need for additional provision for loan losses in order to maintain an allowance that complies with credit risk and accounting policies.

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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 $37 million at March 31, 2014 compared to $36 million at December 31, 2013. The $1 million increase in the allowance for credit losses on lending-related commitments resulted primarily from an increase of $4 million in reserves for standby letters of credit, partially offset by a decrease of $3 million in reserves for unused commitments to extend 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)	March 31, 2014			December 31, 2013
Nonaccrual loans:
Business loans:
Commercial	$	54		$	81
Real estate construction:
Commercial Real Estate business line (a)	18			20
Other business lines (b)	1			1
Total real estate construction	19			21
Commercial mortgage:
Commercial Real Estate business line (a)	58			51
Other business lines (b)	104			105
Total commercial mortgage	162			156
International	—			4
Total nonaccrual business loans	235			262
Retail loans:
Residential mortgage	48			53
Consumer:
Home equity	32			33
Other consumer	2			2
Total consumer	34			35
Total nonaccrual retail loans	82			88
Total nonaccrual loans	317			350
Reduced-rate loans	21			24
Total nonperforming loans	338			374
Foreclosed property	14			9
Total nonperforming assets	$	352		$	383
Nonperforming loans as a percentage of total loans	0.73		%	0.82		%
Nonperforming assets as a percentage of total loans and foreclosed property	0.76			0.84
Allowance for loan losses as a percentage of total nonperforming loans	176			160
Loans past due 90 days or more and still accruing	$	10		$	16
Loans past due 90 days or more and still accruing as a percentage of total loans	0.02		%	0.03		%

(a) Primarily loans to real estate developers.

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

Nonperforming assets decreased $31 million to $352 million at March 31, 2014, from $383 million at December 31, 2013. The decrease in nonperforming assets primarily reflected decreases in nonaccrual commercial loans ($27 million), nonaccrual residential mortgage loans ($5 million) and foreclosed property ($5 million), partially offset by an increase in nonaccrual commercial real estate loans ($7 million). Nonperforming assets as a percentage of total loans and foreclosed property was 0.76 percent at March 31, 2014, compared to 0.84 percent at December 31, 2013.

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

	Three Months Ended
(in millions)	March 31, 2014			December 31, 2013
Balance at beginning of period	$	350		$	437
Loans transferred to nonaccrual (a)	19			23
Nonaccrual business loan gross charge-offs (b)	(27		)	(33		)
Nonaccrual business loans sold (c)	(3		)	(14		)
Payments/other (d)	(22		)	(63		)
Balance at end of period	$	317		$	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	$	27		$	33
Performing criticized loans	—			3
Retail loans	3			5
Total gross loan charge-offs	$	30		$	41
(c) Analysis of loans sold:
Nonaccrual business loans	$	3		$	14
Performing criticized loans	6			22
Total criticized loans sold	$	9		$	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 3 borrowers with balances greater than $2 million, totaling $19 million, transferred to nonaccrual status in the first quarter 2014, a decrease of $4 million when compared to $23 million in the fourth quarter 2013. Of the transfers to nonaccrual greater than $2 million in the first quarter 2014, one borrower with a balance of $12 million was from the Commercial Real Estate business line.

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

	March 31, 2014			December 31, 2013
(dollar amounts in millions)	Number of Borrowers	Balance		Number of Borrowers	Balance
Under $2 million	1,695	$	199	1,756	$	211
$2 million - $5 million	20	58		23	71
$5 million - $10 million	4	31		3	23
$10 million - $25 million	2	29		3	45
Total	1,721	$	317	1,785	$	350

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The following table presents a summary of nonaccrual loans at March 31, 2014 and loans transferred to nonaccrual and net loan charge-offs for the three months ended March 31, 2014, based primarily on North American Industry Classification System (NAICS) categories.

	March 31, 2014				Three Months Ended March 31, 2014
(dollar amounts in millions)	Nonaccrual Loans				Loans Transferred to Nonaccrual (a)				Net Loan Charge-Offs (Recoveries)
Industry Category
Real Estate	$	98	30	%	$	12	63	%	$	3		30	%
Residential Mortgage	48		15		—		—		—			—
Services	40		13		3		15		—			—
Holding & Other Investment Companies	27		9		4		22		(3		)	(30	)
Retail Trade	15		5		—		—		3			24
Manufacturing	12		4		—		—		8			74
Contractors	11		3		—		—		—			—
Natural Resources	7		2		—		—		—			—
Wholesale Trade	6		2		—		—		(1		)	(9	)
Restaurants and Food Service	6		2		—		—		1			7
Health Care and Social Assistance	6		2		—		—		—			—
Other (b)	41		13		—		—		1			4
Total	$	317	100	%	$	19	100	%	$	12		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 March 31, 2014 and December 31, 2013.

(in millions)	March 31, 2014		December 31, 2013
Nonperforming TDRs:
Nonaccrual TDRs	$	89	$	100
Reduced-rate TDRs	21		24
Total nonperforming TDRs	110		124
Performing TDRs (a)	63		57
Total TDRs	$	173	$	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 $22 million in Small Business Banking, $15 million in Middle Market and $13 million in Commercial Real Estate at March 31, 2014.

Loans past due 90 days or more and still accruing are summarized in the following table.

(in millions)	March 31, 2014		December 31, 2013
Business loans:
Commercial	$	3	$	4
Commercial mortgage	5		4
International	—		3
Total business loans	8		11
Retail loans:
Home equity	1		—
Other consumer	1		5
Total retail loans	2		5
Total loans past due 90 days or more and still accruing	$	10	$	16

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 30-89 days increased $27 million to $154 million at March 31, 2014, compared to $127 million at December 31, 2013.

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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)	March 31, 2014			December 31, 2013
Total criticized loans	$	2,139		$	2,260
As a percentage of total loans	4.6		%	5.0		%

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

(in millions)	March 31, 2014		December 31, 2013
Construction, land development and other land	$	2	$	2
Single family residential properties	9		5
Other non-land, nonresidential properties	3		2
Total foreclosed property	$	14	$	9

At March 31, 2014, foreclosed property totaled $14 million and consisted of approximately 95 properties, compared to $9 million and approximately 89 properties at December 31, 2013. There were no foreclosed properties with carrying values greater than $2 million at March 31, 2014 or December 31, 2013.

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

	Three Months Ended
(in millions)	March 31, 2014			December 31, 2013
Balance at beginning of period	$	9		$	19
Acquired in foreclosure	7			4
Write-downs	—			(1		)
Foreclosed property sold (a)	(2		)	(13		)
Balance at end of period	$	14		$	9
(a) Net gain on foreclosed property sold	$	1		$	2

Commercial and Residential Real Estate Lending

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

(in millions)	March 31, 2014		December 31, 2013
Real estate construction loans:
Commercial Real Estate business line (a)	$	1,507	$	1,447
Other business lines (b)	340		315
Total real estate construction loans	$	1,847	$	1,762
Commercial mortgage loans:
Commercial Real Estate business line (a)	$	1,820	$	1,678
Other business lines (b)	6,981		7,109
Total commercial mortgage loans	$	8,801	$	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 March 31, 2014, of which $3.3 billion, or 31 percent, were to borrowers in the Commercial Real Estate business line, which includes loans to real estate developers. The remaining $7.3 billion, or 69 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 totaled $1.8 billion at March 31, 2014. The real estate construction loan portfolio primarily contains loans made to long-time customers with satisfactory completion experience. Of the $1.5 billion of real estate construction loans in the Commercial Real Estate business line, $18 million were on nonaccrual status at March 31, 2014. In other business lines, $1 million of real estate construction loans were on nonaccrual status at March 31, 2014.

The commercial mortgage loan portfolio totaled $8.8 billion at March 31, 2014 and included $1.8 billion in the Commercial Real Estate business line and $7.0 billion in other business lines. Loans in the commercial mortgage portfolio generally mature within three to five years. Of the $1.8 billion of commercial mortgage loans in the Commercial Real Estate business line, $58

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million were on nonaccrual status at March 31, 2014. Commercial mortgage loan net charge-offs in the Commercial Real Estate business line were $5 million for the three months ended March 31, 2014. In other business lines, $104 million of commercial mortgage loans were on nonaccrual status at March 31, 2014, and net charge-offs were insignificant for the three months ended March 31, 2014.

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.

	March 31, 2014
	Location of Property														December 31, 2013
(dollar amounts in millions) Project Type:	California		Michigan		Texas		Florida		Other		Total		% of Total		Total		% of Total
Real estate construction loans:
Commercial Real Estate business line:
Residential:
Single family	$	126	$	10	$	26	$	—	$	9	$	171	12	%	$	155	11	%
Land development	60		6		2		—		2		70		5		73		5
Total residential	186		16		28		—		11		241		17		228		16
Other construction:
Multi-family	461		—		399		17		58		935		62		830		57
Office	106		—		24		—		17		147		10		162		11
Retail	19		1		47		—		—		67		4		102		7
Commercial	14		—		37		—		—		51		3		46		3
Multi-use	—		8		6		—		—		14		1		12		1
Land development	2		—		2		—		—		4		—		13		1
Other	—		25		—		—		20		45		3		51		4
Other real estate construction loans (a)	—		—		3		—		—		3		—		3		—
Total	$	788	$	50	$	546	$	17	$	106	$	1,507	100	%	$	1,447	100	%
Commercial mortgage loans:
Commercial Real Estate business line:
Residential:
Land carry	$	55	$	13	$	11	$	12	$	12	$	103	6	%	$	110	7	%
Single family	15		2		3		—		—		20		1		26		1
Total residential	70		15		14		12		12		123		7		136		8
Other commercial mortgage:
Multi-family	272		31		82		62		3		450		24		378		22
Retail	111		101		107		14		34		367		20		337		20
Office	148		33		39		—		33		253		14		235		14
Commercial	120		28		19		1		36		204		11		178		11
Multi-use	112		7		—		—		—		119		7		113		7
Land carry	46		6		10		6		2		70		4		62		4
Other	51		3		15		—		9		78		4		80		5
Other commercial mortgage loans (a)	27		1		41		5		82		156		9		159		9
Total	$	957	$	225	$	327	$	100	$	211	$	1,820	100	%	$	1,678	100	%

(a) Acquired loans for which complete information related to project type is not available.

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

	March 31, 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	$	423	24	%	$	797	52	%	$	422	25	%	$	808	53	%
California	761		43		458		30		705		41		436		29
Texas	328		19		232		15		340		20		228		15
Other Markets	239		14		46		3		230		14		45		3
Total	$	1,751	100	%	$	1,533	100	%	$	1,697	100	%	$	1,517	100	%

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Residential real estate loans, which consist of traditional residential mortgages and home equity loans and lines of credit, totaled $3.3 billion at March 31, 2014. Residential mortgages totaled $1.8 billion at March 31, 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, $48 million were on nonaccrual status at March 31, 2014. The home equity portfolio totaled $1.5 billion at March 31, 2014, of which $1.4 billion was outstanding under primarily variable-rate, interest-only home equity lines of credit and $97 million were closed-end home equity loans. Of the $1.5 billion of home equity loans outstanding, $32 million were on nonaccrual status at March 31, 2014. A majority of the home equity portfolio was secured by junior liens at March 31, 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, and substantially all junior lien home equity loans that are current or less than 90 days past due 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

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 $10.1 billion at March 31, 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. Comerica Bank (the Bank) was the agent for $1.5 billion of the SNC loans outstanding at both March 31, 2014 and December 31, 2013. Nonaccrual SNC loans decreased $2 million to $9 million at March 31, 2014, compared to $11 million at December 31, 2013. SNC net loan recoveries totaled $2 million for the three months ended March 31, 2014, compared to net charge-offs of $3 million for the three months ended March 31, 2013.

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 $3.1 billion, or approximately 7 percent of total loans, at March 31, 2014, compared to $2.8 billion, or approximately 6 percent of total loans, at December 31, 2013. Nonaccrual Middle Market - Energy loans totaled $1 million at both March 31, 2014 and December 31, 2013. Middle Market - Energy net loan charge-offs were zero for both the three months ended March 31, 2014 and the three months ended December 31, 2013. Energy loans are diverse in nature, with outstanding balances by customer market segment distributed approximately as follows at March 31, 2014: 74 percent exploration and production (comprised of approximately 56 percent oil, 24 percent mixed and 20 percent natural gas), 11 percent midstream and 15 percent energy services.

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 March 31, 2014 and December 31, 2013.

(in millions)	March 31, 2014		December 31, 2013
Loans outstanding	$	23	$	39
Lease financing	330		330
Investment securities available-for-sale	23		22
Trading account securities	1		3
Standby letters of credit	96		97
Unused commitments to extend credit	31		20
Total direct exposure to state and local municipalities	$	504	$	511

Indirect exposure comprised $104 million in auction-rate preferred securities collateralized by municipal securities at March 31, 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 March 31, 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

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all auction-rate preferred securities collateralized by municipal securities were rated investment grade and were adequately collateralized at both March 31, 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 $3.4 billion at March 31, 2014, a decrease of $67 million compared to December 31, 2013. At March 31, 2014, other loans to automotive dealers in the National Dealer Services business line totaled $2.1 billion, including $1.4 billion of owner-occupied commercial real estate mortgage loans, compared to $2.4 billion of other loans to automotive dealers in the National Dealer Service line, including $1.4 billion of owner-occupied commercial real 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 $1.3 billion at both March 31, 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 at March 31, 2014 and December 31, 2013.

	Outstanding (a)
(in millions)	Commercial and Industrial		Banks and Other Financial Institutions		Total Outstanding		Unfunded Commitments and Guarantees		Total Exposure
March 31, 2014
United Kingdom	$	106	$	4	$	110	$	205	$	315
Netherlands	68		—		68		75		143
Germany	10		2		12		42		54
Luxembourg	26		—		26		14		40
Sweden	4		—		4		15		19
Switzerland	3		12		15		1		16
Italy	8		—		8		1		9
Belgium	5		—		5		3		8
France	—		1		1		1		2
Total Europe	$	230	$	19	$	249	$	357	$	606
December 31, 2013
United Kingdom	$	97	$	2	$	99	$	242	$	341
Netherlands	61		—		61		89		150
Germany	5		2		7		47		54
Luxembourg	17		—		17		7		24
Sweden	4		—		4		15		19
Switzerland	3		15		18		1		19
Belgium	1		6		7		4		11
Italy	5		—		5		2		7
France	—		1		1		1		2
Spain	2		—		2		—		2
Total Europe	$	195	$	26	$	221	$	408	$	629

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

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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 Treasury and Enterprise Risk Departments supports ALCO in measuring, monitoring and managing interest rate, liquidity and coordination of 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 analysis 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 March 31, 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 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 interest rate scenario includes assumptions such as loan growth, investment security prepayment levels, depositor behavior, yield curves, 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. Changes in economic activity, whether domestic or international, may result in a balance sheet structure that is different from the changes management

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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 March 31, 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
	March 31, 2014					December 31, 2013
(in millions)	Amount			%		Amount			%
Change in Interest Rates:
+200 basis points	$	213		13	%	$	210		13	%
-25 basis points (to zero percent)	(29		)	(2	)	(30		)	(2	)

Sensitivity increased slightly from December 31, 2013 to March 31, 2014 primarily due to modest changes in forecasted balance sheet mix. 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 March 31, 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. 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. The analysis also does not capture possible regulatory impacts, including proposed liquidity requirements, which could impact pricing and deposit products offered and how interest rate risk is managed.

	+200 Basis Points
(in millions)	Estimated Annual Change
March 31, 2014	Amount		%
Incremental Average Decrease in Noninterest-bearing Deposit Balances:
$1 billion	$	202	12	%
$3 billion	180		11

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 March 31, 2014 and December 31, 2013, displays the estimated impact on the economic value of equity from the interest rate scenario described above.

	March 31, 2014					December 31, 2013
(in millions)	Amount			%		Amount			%
Change in Interest Rates:
+200 basis points	$	653		6	%	$	670		6	%
-25 basis points (to zero percent)	(180		)	(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 March 31, 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.

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 March 31, 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

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deposit through brokers. Purchased funds totaled $629 million at March 31, 2014, compared to $602 million at December 31, 2013. At March 31, 2014, the Bank had pledged loans totaling $25 billion which provided for up to $20 billion of available collateralized borrowing with the FRB.

The Bank is a member of the Federal Home Loan Bank of Dallas, Texas (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 March 31, 2014, $14 billion of real estate-related loans were pledged to the FHLB as blanket collateral for current and potential future borrowings. As of March 31, 2014, the Corporation had $1.0 billion of outstanding borrowings from the FHLB maturing in May 2014.

Additionally, the Bank had the ability to issue up to $15.0 billion of debt at March 31, 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 also maintains a shelf registration statement with the Securities and Exchange Commission from which it may issue debt and/or equity securities.

The Federal Reserve 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 subordinated notes due 2024. The notes are callable at par on or after July 15, 2014 and were recorded at a carrying value of $183 million at March 31, 2014.

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

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 March 31, 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
March 31, 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 $11.9 billion at March 31, 2014, compared to $12.6 billion at December 31, 2013, 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 March 31, 2014, the Corporation held excess liquidity, represented by $4.3 billion deposited with the FRB, 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, the Corporation does not believe there are any material changes in the nature or categories of the critical accounting policies or estimates and assumptions from those discussed in the Corporation's 2013 Annual Report.

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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)	March 31, 2014			December 31, 2013
Tier 1 Common Capital Ratio:
Tier 1 and Tier 1 common capital (a) (b)	$	6,961		$	6,895
Risk-weighted assets (a) (b)	66,051			64,825
Tier 1 and Tier 1 common risk-based capital ratio (b)	10.54		%	10.64		%
Basel III Common Equity Tier 1 Capital Ratio:
Tier 1 common capital (b)	$	6,961		$	6,895
Basel III adjustments (c)	(3		)	(6		)
Basel III common equity Tier 1 capital (c)	$	6,958		$	6,889
Risk-weighted assets (a) (b)	$	66,051		$	64,825
Basel III adjustments (c)	1,603			1,754
Basel III risk-weighted assets (c)	$	67,654		$	66,579
Tier 1 common capital ratio (b)	10.5		%	10.6		%
Basel III common equity Tier 1 capital ratio (c)	10.3			10.3
Tangible Common Equity Ratio:
Common shareholders' equity	$	7,283		$	7,153
Less:
Goodwill	635			635
Other intangible assets	16			17
Tangible common equity	$	6,632		$	6,501
Total assets	$	65,681		$	65,227
Less:
Goodwill	635			635
Other intangible assets	16			17
Tangible assets	$	65,030		$	64,575
Common equity ratio	11.09		%	10.97		%
Tangible common equity ratio	10.20			10.07
Tangible Common Equity per Share of Common Stock:
Common shareholders' equity	$	7,283		$	7,153
Tangible common equity	6,632			6,501
Shares of common stock outstanding (in millions)	182			182
Common shareholders' equity per share of common stock	$	40.09		$	39.23
Tangible common equity per share of common stock	36.50			35.65

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

(b) March 31, 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.

60

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.

61

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) (filed as Exhibit 10.1 to Registrant's Current Report on Form 8-K dated January 21, 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) (filed as Exhibit 10.2 to Registrant's Current Report on Form 8-K dated January 21, 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 (filed as Exhibit 10.3 to Registrant's Current Report on Form 8-K dated January 21, 2014, and incorporated herein by reference).
10.4†	Restrictive Covenants and General Release Agreement by and between J. Michael Fulton and Comerica Incorporated dated April 3, 2014 (filed as Exhibit 10.1 to Registrant's Current Report on Form 8-K dated April 3, 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 March 31, 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.

62

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: April 29, 2014

63

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) (filed as Exhibit 10.1 to Registrant's Current Report on Form 8-K dated January 21, 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) (filed as Exhibit 10.2 to Registrant's Current Report on Form 8-K dated January 21, 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 (filed as Exhibit 10.3 to Registrant's Current Report on Form 8-K dated January 21, 2014, and incorporated herein by reference).
10.4†	Restrictive Covenants and General Release Agreement by and between J. Michael Fulton and Comerica Incorporated dated April 3, 2014 (filed as Exhibit 10.1 to Registrant's Current Report on Form 8-K dated April 3, 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 March 31, 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.

64

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 March 31, 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:	April 29, 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 March 31, 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:	April 29, 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 March 31, 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:	April 29, 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 $)	3 Months Ended
	Mar. 31, 2014 Security		Mar. 31, 2013
Securities with no credit impairment in unrealized loss position	169
Gross realized gains on sales and calls of investment securities available-for-sale	$ 1,000,000		$ 0
Gross realized losses on sales and calls of investment securities available-for-sale	0	[1]	0	[1]
Amortized cost securities	9,256,000,000
Fair value securities	9,245,000,000
Carrying value of securities pledged	3,300,000,000
Liabilities secured by pledged collateral	2,300,000,000
Residential Mortgage-Backed Securities
Securities with no credit impairment in unrealized loss position	103
Amortized cost securities	9,100,000,000
Fair value securities	9,100,000,000
Auction Rate Preferred Securities [Member]
Securities with no credit impairment in unrealized loss position	48
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
Equity and Other Non-Debt Securities
Securities with no credit impairment in unrealized loss position	1
Auction-Rate Securities [Member]
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	25,000,000
Fair value securities	$ 24,000,000

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjYwNWEyYjIxMjIzYTQ5N2U4ODcxYjMyMmFiMjk0YzZlfFRleHRTZWxlY3Rpb246N0Y0OEM3MEQzREEyRTM5NTE5QjE4OTI4RkU1MDNERTIM}

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
	Mar. 31, 2014	Mar. 31, 2013
Credit Quality And Allowance For Credit Losses [Abstract]
Balance at beginning of period	$ 15	$ 16
Reclassifications from nonaccretable	5	0
Accretion	(9)	(4)
Balance at end of period	$ 11	$ 12

XML

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
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ 9	$ 16
Lending-related commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	36	32
Provision for credit losses	1	4
Balance at end of period	$ 37	$ 36

XML

Contingent Liabilities (Narrative) (Details) (USD $)	3 Months Ended			0 Months Ended			1 Months Ended		3 Months Ended		29 Months Ended	0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Pending Litigation	Jan. 17, 2014 Butte Local Development v. Masters Group v. Comerica Bank	Jan. 06, 2014 Butte Local Development v. Masters Group v. Comerica Bank	Nov. 16, 2011 Butte Local Development v. Masters Group v. Comerica Bank	Dec. 31, 2008 Butte Local Development v. Masters Group v. Comerica Bank	Jul. 31, 2006 Butte Local Development v. Masters Group v. Comerica Bank	Mar. 31, 2014 Butte Local Development v. Masters Group v. Comerica Bank	Dec. 31, 2013 Butte Local Development v. Masters Group v. Comerica Bank	Dec. 30, 2008 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]
Date the lender liability case was filed						November 16, 2011
Date the lender liability case trial began					Jan. 06, 2014
Initial line of credit extended to Masters								$ 9,000,000
Loan amount to Masters after subsequent increase											10,500,000
Amount owed by Masters to Butte Local Development							200,000
Amount of damages awarded by the jury				275,000								52,000,000
Increase in reserve for litigation-related expense	3,000,000	3,000,000							2,000,000	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			85,000,000
Legal Fees	$ 5,000,000	$ 8,000,000

XML

Derivative And Credit-Related Financial Instruments (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair value of securities pledged as collateral for derivative assets	$ 117,000,000
Cash deposited as collateral for derivative assets	3,000,000
Available-for-sale securities pledged as collateral for derivative liabilities	8,000,000
Cash posted as collateral for derivative liabilities	19,000,000
Aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	7,000,000
Collateral pledged for aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	3,000,000
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
Net interest income generated by risk management fair value interest rate swaps	18,000,000	18,000,000
Allowance for credit losses on lending-related commitments	37,000,000		36,000,000
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit	25,000,000		28,000,000
Risk participation agreements covering standby and commercial letters of credit	250,000,000		259,000,000
Standby and commercial letters of credit	4,300,000,000		4,400,000,000
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities	65,000,000		59,000,000
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities	53,000,000		51,000,000
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit	12,000,000		8,000,000
Notional Amount of Derivative Credit Risk Participation Agreements	583,000,000		614,000,000
Maximum estimated exposure to credit risk participation agreements assuming 100% default	6,000,000		7,000,000
Weighted average remaining maturity of credit risk participation agreements, in years	2 years 6 months 0 days
Fair value of derivative liability	236,000,000		249,000,000
Visa derivative contract
Notional amount of the derivative contract equivalent to Visa Class B shares	780,000
Fair value of derivative liability	$ 2,000,000		$ 2,000,000

XML

Credit Quality And Allowance For Credit Losses (Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Nonaccrual loans	$ 317		$ 350
Reduced-rate loans	21	[1]	24	[1]
Total nonperforming loans	338		374
Foreclosed property	14		9
Total nonperforming assets	352		383
Retail loans
Nonaccrual loans	82		88
Reduced-rate loans	17		20
Business loans
Nonaccrual loans	235		262
Reduced-rate loans	$ 4		$ 4

[1] Reduced-rate business loans totaled $4 million at both March 31, 2014 and December 31, 2013, and reduced-rate retail loans totaled $17 million and $20 million at March 31, 2014 and December 31, 2013, respectively.

XML

Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Derivative assets	$ 479			$ 500
Fair value of derivative liability	236			249
Commitments to fund additional investments in nonmarketable equity securities	5
Underlying assets of funds, estimated liquidation period, years, maximum	16 years
Federal Home Loan Bank stock	48			48
Federal Reserve Bank stock	85			85
Recurring [Member]
Derivative assets	482			503
Transfers into or out of Level 1 or Level 2 or Level 3	0		0
Total liabilities at fair value	335			347
Nonrecurring [Member]
Commitments to fund additional investments in nonmarketable equity securities	0			0
Total liabilities at fair value	0			0
Carrying Amount [Member]
Carrying value of nonmarketable equity securities	12	[1]		12	[1]
Warrants | Recurring [Member]
Derivative assets	3			3
Visa derivative contract
Fair value of derivative liability	$ 2			$ 2

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

XML

Business Segment Information (Market Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Net interest income (expense) (FTE)	$ 411		$ 416
Provision for credit losses	9		16
Noninterest income	208		213
Noninterest expenses	406		416
Provision (benefit) for income taxes (FTE)	65		63
Net income (loss)	139		134
Net credit-related charge-offs (recoveries)	12		24
Assets, average	64,708		63,451
Loans, average	45,075		44,617
Deposits, average	52,770		50,692
Return on average assets	0.86%	[1]	0.84%	[1]
Efficiency ratio	65.79%	[2]	66.15%	[2]
Michigan
Net interest income (expense) (FTE)	183		190
Provision for credit losses	3		(7)
Noninterest income	87		92
Noninterest expenses	161		168
Provision (benefit) for income taxes (FTE)	38		43
Net income (loss)	68		78
Net credit-related charge-offs (recoveries)	0		5
Assets, average	13,819		14,042
Loans, average	13,473		13,650
Deposits, average	20,642		20,254
Return on average assets	1.26%	[1]	1.47%	[1]
Efficiency ratio	59.71%	[2]	59.53%	[2]
California
Net interest income (expense) (FTE)	172		171
Provision for credit losses	11		21
Noninterest income	34		35
Noninterest expenses	96		97
Provision (benefit) for income taxes (FTE)	36		32
Net income (loss)	63		56
Net credit-related charge-offs (recoveries)	10		10
Assets, average	15,133		13,795
Loans, average	14,824		13,542
Deposits, average	14,782		14,356
Return on average assets	1.59%	[1]	1.45%	[1]
Efficiency ratio	46.72%	[2]	47.04%	[2]
Texas
Net interest income (expense) (FTE)	136		134
Provision for credit losses	6		8
Noninterest income	31		31
Noninterest expenses	90		91
Provision (benefit) for income taxes (FTE)	25		23
Net income (loss)	46		43
Net credit-related charge-offs (recoveries)	6		6
Assets, average	11,070		10,795
Loans, average	10,364		10,071
Deposits, average	10,875		9,959
Return on average assets	1.50%	[1]	1.54%	[1]
Efficiency ratio	53.83%	[2]	54.99%	[2]
Other Markets
Net interest income (expense) (FTE)	72		81
Provision for credit losses	(10)		(2)
Noninterest income	40		38
Noninterest expenses	48		44
Provision (benefit) for income taxes (FTE)	18		21
Net income (loss)	56		56
Net credit-related charge-offs (recoveries)	(4)		3
Assets, average	6,865		7,859
Loans, average	6,414		7,354
Deposits, average	5,901		5,676
Return on average assets	3.28%	[1]	2.86%	[1]
Efficiency ratio	43.39%	[2]	37.41%	[2]
Finance & Other
Net interest income (expense) (FTE)	(152)		(160)
Provision for credit losses	(1)		(4)
Noninterest income	16		17
Noninterest expenses	11		16
Provision (benefit) for income taxes (FTE)	(52)		(56)
Net income (loss)	(94)		(99)
Net credit-related charge-offs (recoveries)	0		0
Assets, average	17,821		16,960
Loans, average	0		0
Deposits, average	$ 570		$ 447

[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.

XML

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	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Notional Amount	$ 20,693	[1]	$ 20,538	[1]
Risk Management Purposes [Member]
Notional Amount	1,896	[1]	1,703	[1]
Long-term Debt [Member] | Swaps - Fair Value Hedge - Receive Fixed/Pay Floating [Member] | Risk Management Purposes [Member] | Interest Rate Swap [Member]
Notional Amount	$ 1,450		$ 1,450
Weighted Average Remaining Maturity	3 years 2 months 1 day		3 years 5 months 0 days
Weighted Average Receive Rate	5.45%		5.45%
Weighted Average Pay Rate	0.35%	[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 March 31, 2014 and December 31, 2013.

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Business Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2014 markets segments
Segment Reporting [Abstract]
Number of Major Business Segments	3
Number of Primary Market Segments	3

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Derivative And Credit-Related Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2014

Derivative And Credit-Related Financial Instruments [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 March 31, 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.

	March 31, 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	$	1,450	$	191		$	—		$	1,450	$	198		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	446		1			1			253		1			—
Total risk management purposes	1,896		192			1			1,703		199			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	268		—			1			277		—			1
Caps and floors purchased	268		1			—			277		1			—
Swaps	11,282		166			117			11,143		181			132
Total interest rate contracts	11,818		167			118			11,697		182			133
Energy contracts:
Caps and floors written	1,180		1			43			1,325		1			48
Caps and floors purchased	1,180		43			1			1,325		48			1
Swaps	2,589		59			57			2,724		56			53
Total energy contracts	4,949		103			101			5,374		105			102
Foreign exchange contracts:
Spot, forwards, options and swaps	2,030		17			16			1,764		14			14
Total customer-initiated and other activities	18,797		287			235			18,835		301			249
Total gross derivatives	$	20,693	479			236			$	20,538	500			249
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(166		)	(166		)			(187		)	(187		)
Netting adjustment - Cash collateral received/posted			(1		)	(17		)			(2		)	(10		)
Net derivatives included in the consolidated balance sheets (b)			312			53					311			52
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(114		)	(8		)			(138		)	(10		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	198		$	45				$	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 totaled $2 million at both March 31, 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 March 31, 2014 and December 31, 2013.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
March 31, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,450	3.2	5.45	%	0.35	%
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 March 31, 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 March 31,
(in millions)	Location of Gain	2014		2013
Interest rate contracts	Other noninterest income	$	4	$	3
Energy contracts	Other noninterest income	—		1
Foreign exchange contracts	Foreign exchange income	9		9
Total		$	13	$	13

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)	March 31, 2014		December 31, 2013
Unused commitments to extend credit:
Commercial and other	$	26,925	$	27,728
Bankcard, revolving check credit and home equity loan commitments	1,923		1,889
Total unused commitments to extend credit	$	28,848	$	29,617
Standby letters of credit	$	4,171	$	4,297
Commercial letters of credit	96		103
Other credit-related financial instruments	2		2

Summary Of Criticized Letters Of Credit

The following table presents a summary of criticized standby and commercial letters of credit at March 31, 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)	March 31, 2014			December 31, 2013
Total criticized standby and commercial letters of credit	$	92		$	69
As a percentage of total outstanding standby and commercial letters of credit	2.2		%	1.6		%

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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
	Mar. 31, 2014		Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	$ 263		$ 409
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		1
Business loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	213		362
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		1
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	62		114
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		1
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	19	[1]	27	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[1]	0	[1]
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	129		220
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		0
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	62	[1]	96	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	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	67	[2]	124	[2]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1	[2]	0	[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	3		0
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0
Retail loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	50		47
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	34		37
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	16		10
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0
Retail loans | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	12		6
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0
Retail loans | Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	4		4
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	$ 0		$ 0

[1] Primarily loans to real estate developers.

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

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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Within one year, Amortized Cost	$ 155
After one year through five years, Amortized Cost	268
After five years through ten years, Amortized Cost	277
After ten years, Amortized Cost	8,556
Subtotal, Amortized Cost	9,256
Within one year, Fair Value	155
After one year through five years, Fair Value	269
After five years through ten years, Fair Value	287
After ten years, Fair Value	8,534
Subtotal, Fair Value	9,245
Total investment securities available-for-sale, Amortized Cost	9,501	[1]	9,414	[1]
Total investment securities available-for-sale, Fair Value	9,487	[1]	9,307	[1]
Equity and Other Non-Debt Securities
Total investment securities available-for-sale, Amortized Cost	245		266
Total investment securities available-for-sale, Fair Value	$ 242		$ 258

[1] Included auction-rate securities at amortized cost and fair value of $146 million and $142 million, respectively, as of March 31, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

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Fair Value Measurements (Quantitative Information About Level 3 Measurements) (Details) (Recurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	$ 10,072		$ 9,918
Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	145		162
State And Municipal Securities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	23	[1]	22	[1]
State And Municipal Securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	4.00%	[1]	5.00%	[1]
Unobservable Input, Workout period	1 year	[1]	3 years	[1]
State And Municipal Securities | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	9.00%	[1]	10.00%	[1]
Unobservable Input, Workout period	4 years	[1]	4 years	[1]
Equity and Other Non-Debt Securities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	$ 118	[1]	$ 136	[1]
Equity and Other Non-Debt Securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	5.00%	[1]	5.00%	[1]
Unobservable Input, Workout period	1 year	[1]	2 years	[1]
Equity and Other Non-Debt Securities | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	7.00%	[1]	8.00%	[1]
Unobservable Input, Workout period	3 years	[1]	3 years	[1]

[1] Auction-rate securities.

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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
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Principal Deferrals	Mar. 31, 2013 Principal Deferrals	Mar. 31, 2014 Interest Rate Reductions	Mar. 31, 2013 Interest Rate Reductions	Mar. 31, 2014 AB Note Restructures	Mar. 31, 2013 AB Note Restructures	Mar. 31, 2014 Business loans Principal Deferrals	Mar. 31, 2013 Business loans Principal Deferrals	Mar. 31, 2014 Business loans Commercial Principal Deferrals	Mar. 31, 2013 Business loans Commercial Principal Deferrals	Mar. 31, 2014 Business loans Real estate construction Commercial Real Estate business line Principal Deferrals		Mar. 31, 2013 Business loans Real estate construction Commercial Real Estate business line Principal Deferrals		Mar. 31, 2014 Business loans Commercial mortgage Principal Deferrals	Mar. 31, 2013 Business loans Commercial mortgage Principal Deferrals	Mar. 31, 2014 Business loans Commercial mortgage Commercial Real Estate business line Principal Deferrals		Mar. 31, 2013 Business loans Commercial mortgage Commercial Real Estate business line Principal Deferrals		Mar. 31, 2014 Business loans Commercial mortgage Other business lines Principal Deferrals		Mar. 31, 2013 Business loans Commercial mortgage Other business lines Principal Deferrals		Mar. 31, 2014 Business loans International Principal Deferrals	Mar. 31, 2013 Business loans International Principal Deferrals	Mar. 31, 2014 Retail loans Principal Deferrals	Mar. 31, 2013 Retail loans Principal Deferrals	Mar. 31, 2014 Retail loans Residential mortgage Principal Deferrals		Mar. 31, 2013 Retail loans Residential mortgage Principal Deferrals		Mar. 31, 2014 Retail loans Consumer Principal Deferrals	Mar. 31, 2013 Retail loans Consumer Principal Deferrals	Mar. 31, 2014 Retail loans Consumer Home equity Principal Deferrals		Mar. 31, 2013 Retail loans Consumer Home equity Principal Deferrals		Mar. 31, 2014 Retail loans Consumer Other consumer Principal Deferrals		Mar. 31, 2013 Retail loans Consumer Other consumer Principal Deferrals
Financing Receivable, Modifications [Line Items]
Carrying amount PCI loans	$ 5	$ 5
Balance			54	77	6	4	8	30	43	66	13	12	0	[1]	1	[1]	29	53	17	[1]	36	[1]	12	[2]	17	[2]	1	0	11	11	3	[3]	5	[3]	8	6	6	[3]	4	[3]	2	[3]	2	[3]
Default Loans On Modified Loans																											0	0
Subsequent Default During Period			$ 2	$ 21	$ 0	$ 0	$ 0	$ 0	$ 2	$ 21	$ 2	$ 1	$ 0	[1]	$ 0	[1]	$ 0	$ 20	$ 0	[1]	$ 16	[1]	$ 0	[2]	$ 4	[2]			$ 0	$ 0	$ 0		$ 0		$ 0	$ 0	$ 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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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
	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding securities	8.7	15.1
Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	48.17	34.78
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	61.94	61.94

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Variable Interest Entities (VIEs) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Variable Interest Entity [Line Items]
Unfunded commitments to fund tax credit entities	$ 136
Corporation provided financial or other support not contractually required to VIEs	0	0
Low Income Housing Tax Credit Entities [Member]
Variable Interest Entity [Line Items]
Exposure to loss as a result of involvement with VIEs	381
Other Tax Credit Entities [Member]
Variable Interest Entity [Line Items]
Exposure to loss as a result of involvement with VIEs	$ 13

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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
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses	$ 9		$ 16
PCI loans	5				5
Total loans	46,489				45,470
Allowance for PCI loans	0				0
Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	42,521				41,536
Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3,968				3,934
Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	598		629
Loan charge-offs	(30)		(38)
Recoveries on loans previously charged-off	18		14
Net loan charge-offs	(12)		(24)
Provision for loan losses	8		12
Balance at end of period	594		617
As a percentage of total loans	1.28%		1.37%
Allowance for loan losses individually evaluated for impairment	39		60
Allowance for loan losses collectively evaluated for impairment	555		557
Total allowance for loan losses	594		617
Loans individually evaluated for impairment	253		397
Loans collectively evaluated for impairment	46,231		44,641
PCI loans	5	[1]	29	[1]
Total loans	46,489		45,067
Financing Receivable [Member] | Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	531		552
Loan charge-offs	(27)		(34)
Recoveries on loans previously charged-off	16		12
Net loan charge-offs	(11)		(22)
Provision for loan losses	10		14
Balance at end of period	530		544
As a percentage of total loans	1.25%		1.32%
Allowance for loan losses individually evaluated for impairment	39		60
Allowance for loan losses collectively evaluated for impairment	491		484
Total allowance for loan losses	530		544
Loans individually evaluated for impairment	204		355
Loans collectively evaluated for impairment	42,315		40,964
PCI loans	2	[1]	24	[1]
Total loans	42,521		41,343
Financing Receivable [Member] | Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	67		77
Loan charge-offs	(3)		(4)
Recoveries on loans previously charged-off	2		2
Net loan charge-offs	(1)		(2)
Provision for loan losses	(2)		(2)
Balance at end of period	64		73
As a percentage of total loans	1.62%		1.97%
Allowance for loan losses individually evaluated for impairment	0		0
Allowance for loan losses collectively evaluated for impairment	64		73
Total allowance for loan losses	64		73
Loans individually evaluated for impairment	49		42
Loans collectively evaluated for impairment	3,916		3,677
PCI loans	3	[1]	5	[1]
Total loans	$ 3,968		$ 3,724

[1] No allowance for loan losses was required for PCI loans at March 31, 2014 and 2013.

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Fair Value Measurements

3 Months Ended

Mar. 31, 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 $3 million at March 31, 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 March 31, 2014, the fair value of the contract was a liability of $2 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 March 31, 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 16 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 March 31, 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 $48 million at both March 31, 2014 and December 31, 2013, and its investment in FRB stock totaled $85 million at both March 31, 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 March 31, 2014 and December 31, 2013.

(in millions)	Total		Level 1		Level 2		Level 3
March 31, 2014
Trading securities:
Deferred compensation plan assets	$	97	$	97	$	—	$	—
Equity and other non-debt securities	1		1		—		—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	1		—		1		—
Corporate debt securities	1		—		1		—
Total trading securities	103		98		5		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	9,123		—		9,123		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	54		—		53		1		(b)
Equity and other non-debt securities	242		124		—		118		(b)
Total investment securities available-for-sale	9,487		169		9,176		142
Derivative assets:
Interest rate contracts	358		—		358		—
Energy derivative contracts	103		—		103		—
Foreign exchange contracts	18		—		18		—
Warrants	3		—		—		3
Total derivative assets	482		—		479		3
Total assets at fair value	$	10,072	$	267	$	9,660	$	145
Derivative liabilities:
Interest rate contracts	$	118	$	—	$	118	$	—
Energy derivative contracts	101		—		101		—
Foreign exchange contracts	17		—		17		—
Other	2		—		—		2
Total derivative liabilities	238		—		236		2
Deferred compensation plan liabilities	97		97		—		—
Total liabilities at fair value	$	335	$	97	$	236	$	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.

(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 the three months ended March 31, 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 months ended March 31, 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
Three Months Ended March 31, 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		1		(c)	—			5		(b)	(24		)	118
Total investment securities available-for-sale	159		1		(c)	—			6		(b)	(24		)	142
Derivative assets:
Warrants	3		—			1		(d)	—			(1		)	3
Derivative liabilities:
Other	2		—			—			—			—			2
Three Months Ended March 31, 2013
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)	156		—			—			1		(b)	(4		)	153
Total investment securities available-for-sale	180		—			—			1		(b)	(4		)	177
Derivative assets:
Warrants	3		1		(d)	—			—			(1		)	3
Derivative liabilities:
Other	1		—			—			—			—			1

(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 March 31, 2014 and December 31, 2013 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at March 31, 2014 and December 31, 2013.

(in millions)	Level 3
March 31, 2014
Loans:
Commercial	$	20
Real estate construction	17
Commercial mortgage	74
Total loans	111
Nonmarketable equity securities	2
Other real estate	3
Total assets at fair value	$	116
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 March 31, 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 March 31, 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 the low interest rate environment continuing into 2015. The March 31, 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)
March 31, 2014
State and municipal securities (a)	$	23	4% - 9%	1 - 4
Equity and other non-debt securities (a)	118		5% - 7%	1 - 3
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
March 31, 2014
Assets
Cash and due from banks	$	1,186		$	1,186		$	1,186	$	—	$	—
Interest-bearing deposits with banks	4,434			4,434			4,434		—		—
Loans held-for-sale	2			2			—		2		—
Total loans, net of allowance for loan losses (a)	45,895			45,932			—		—		45,932
Customers’ liability on acceptances outstanding	12			12			12		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	133			133			133		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,955			23,955			—		23,955		—
Interest-bearing deposits	24,696			24,696			—		24,696		—
Customer certificates of deposit	5,099			5,090			—		5,090		—
Total deposits	53,750			53,741			—		53,741		—
Short-term borrowings	160			160			160		—		—
Acceptances outstanding	12			12			12		—		—
Medium- and long-term debt	3,534			3,527			—		3,527		—
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 $111 million and $128 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2014 and December 31, 2013, respectively.

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

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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
	Mar. 31, 2014	Mar. 31, 2013
Variable Interest Entity [Line Items]
Other noninterest income	$ 33	$ 38
Benefit for income taxes	64	63
Variable Interest Entity
Variable Interest Entity [Line Items]
Other noninterest income	(2)	(1)
Benefit for income taxes	(6)	(6)
Proportional Amortization Method Classified In Income Taxes [Member] | Variable Interest Entity
Variable Interest Entity [Line Items]
Benefit for income taxes	14	13
Low Income Housing Tax Credits [Member] | Variable Interest Entity
Variable Interest Entity [Line Items]
Benefit for income taxes	(14)	(14)
Other Tax Benefits Related To Tax Credit Entities [Member] | Variable Interest Entity
Variable Interest Entity [Line Items]
Benefit for income taxes	$ (6)	$ (5)

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Credit Quality And Allowance For Credit Losses (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Credit Quality And Allowance For Credit Losses [Abstract]
Commitments to lend additional funds to TDR borrowers	$ 4	$ 4
Allowance for PCI loans	0	0
Nonaccretable yield on PCI loans	$ 9

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Net Income Per Common Share (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(in millions, except per share data)	2014		2013
Basic and diluted
Net income	$	139	$	134
Less:
Income allocated to participating securities	2		2
Net income attributable to common shares	$	137	$	132
Basic average common shares	180		185
Basic net income per common share	$	0.76	$	0.71
Basic average common shares	180		185
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	2		—
Net effect of the assumed exercise of warrants	5		2
Diluted average common shares	187		187
Diluted net income per common share	$	0.73	$	0.70

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 March 31,
(shares in millions)	2014	2013
Average outstanding options	8.7	15.1
Range of exercise prices	$48.17 - $61.94	$34.78 - $61.94

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2014 and 2013, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Three Months Ended March 31,
(in millions)	2014			2013
Accumulated net unrealized (losses) gains 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	94			(18		)
Less: Provision (benefit) for income taxes	33			(7		)
Net unrealized holding gains (losses) arising during the period, net of tax	61			(11		)
Less:
Net realized gains included in net securities gains	1			—
Less: Provision for income taxes	—			—
Reclassification adjustment for net securities gains included in net income, net of tax	1			—
Change in net unrealized (losses) gains on investment securities available-for-sale, net of tax	60			(11		)
Balance at end of period, net of tax	$	(8	)	$	139
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(323	)	$	(563	)
Net defined benefit pension and other postretirement plans adjustment arising during the period, net of tax	—			—
Less:
Amortization of actuarial net loss	(10		)	(21		)
Amortization of prior service cost	—			(1		)
Amounts recognized in employee benefits expense	(10		)	(22		)
Less: Benefit for income taxes	(4		)	(8		)
Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax	(6		)	(14		)
Change in defined benefit pension and other postretirement plans adjustment, net of tax	6			14
Balance at end of period, net of tax	$	(317	)	$	(549	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(325	)	$	(410	)

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Derivative And Credit-Related Financial Instruments (Schedule Of Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	$ 20,693	[1]	$ 20,538	[1]
Fair Value of Gross Derivative Assets	479		500
Fair Value of Gross Derivative Liabilities	236		249
Derivative Asset, Netting Adjustment - Offsetting Liabilities	(166)		(187)
Derivative Liability, Netting Adjustment - Offsetting Assets	(166)		(187)
Derivative Asset, Netting Adjustment - Cash Collateral Received	(1)		(2)
Derivative Liability, Netting Adjustment, Cash Collateral Posted	(17)		(10)
Net Derivative Assets Included in the Consolidated Balance Sheets	312	[2]	311	[2]
Net Derivative Liabilities Included in the Consolidated Balance Sheets	53	[2]	52	[2]
Derivative Asset, Securities Pledged As Collateral	(114)		(138)
Derivative Liability, Securities Pledged As Collateral	(8)		(10)
Net Derivative Assets After Deducting Amounts Not Offset in the Consolidated Balance Sheets	198		173
Net Derivative Liabilities After Deducting Amounts Not Offset in the Consolidated Balance Sheets	45		42
Derivative Credit Risk Valuation Adjustment, Derivative Assets	2		2
Risk Management Purposes [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	1,896	[1]	1,703	[1]
Fair Value of Gross Derivative Assets	192		199
Fair Value of Gross Derivative Liabilities	1		0
Risk Management Purposes [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	1,450	[1]	1,450	[1]
Fair Value of Gross Derivative Assets	191		198
Fair Value of Gross Derivative Liabilities	0		0
Risk Management Purposes [Member] | Derivatives Used As Economic Hedges [Member] | Foreign Exchange Spot Forward And Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	446	[1]	253	[1]
Fair Value of Gross Derivative Assets	1		1
Fair Value of Gross Derivative Liabilities	1		0
Customer-Initiated And Other Activities [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	18,797	[1]	18,835	[1]
Fair Value of Gross Derivative Assets	287		301
Fair Value of Gross Derivative Liabilities	235		249
Customer-Initiated And Other Activities [Member] | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	11,818	[1]	11,697	[1]
Fair Value of Gross Derivative Assets	167		182
Fair Value of Gross Derivative Liabilities	118		133
Customer-Initiated And Other Activities [Member] | Interest Rate Caps And Floors Written [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	268	[1]	277	[1]
Fair Value of Gross Derivative Assets	0		0
Fair Value of Gross Derivative Liabilities	1		1
Customer-Initiated And Other Activities [Member] | Interest Rate Caps and Floors Purchased [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	268	[1]	277	[1]
Fair Value of Gross Derivative Assets	1		1
Fair Value of Gross Derivative Liabilities	0		0
Customer-Initiated And Other Activities [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	11,282	[1]	11,143	[1]
Fair Value of Gross Derivative Assets	166		181
Fair Value of Gross Derivative Liabilities	117		132
Customer-Initiated And Other Activities [Member] | Energy Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	4,949	[1]	5,374	[1]
Fair Value of Gross Derivative Assets	103		105
Fair Value of Gross Derivative Liabilities	101		102
Customer-Initiated And Other Activities [Member] | Energy Caps and Floors Written [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	1,180	[1]	1,325	[1]
Fair Value of Gross Derivative Assets	1		1
Fair Value of Gross Derivative Liabilities	43		48
Customer-Initiated And Other Activities [Member] | Energy Caps and Floors Purchased [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	1,180	[1]	1,325	[1]
Fair Value of Gross Derivative Assets	43		48
Fair Value of Gross Derivative Liabilities	1		1
Customer-Initiated And Other Activities [Member] | Energy Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	2,589	[1]	2,724	[1]
Fair Value of Gross Derivative Assets	59		56
Fair Value of Gross Derivative Liabilities	57		53
Customer-Initiated And Other Activities [Member] | Foreign Exchange Spot, Forwards, Options and Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	2,030	[1]	1,764	[1]
Fair Value of Gross Derivative Assets	17		14
Fair Value of Gross Derivative Liabilities	$ 16		$ 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 totaled $2 million at both March 31, 2014 and 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	Mar. 31, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	$ 124		$ 97
60-89 days past due and still accruing	30		30
90 days or more past due and still accruing	10		16
Total loans past due and still accruing	164		143
Nonaccrual loans	317		350
Current loans	46,008	[1]	44,977	[1]
Total loans	46,489		45,470
Carrying amount PCI loans	5		5
Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	101		72
60-89 days past due and still accruing	26		24
90 days or more past due and still accruing	8		11
Total loans past due and still accruing	135		107
Nonaccrual loans	235		262
Current loans	42,151	[1]	41,167	[1]
Total loans	42,521		41,536
Business loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	30		36
60-89 days past due and still accruing	20		17
90 days or more past due and still accruing	3		4
Total loans past due and still accruing	53		57
Nonaccrual loans	54		81
Current loans	29,667	[1]	28,677	[1]
Total loans	29,774		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	0		0
90 days or more past due and still accruing	0		0
Total loans past due and still accruing	0		0
Nonaccrual loans	19		21
Current loans	1,828	[1]	1,741	[1]
Total loans	1,847		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	0	[2]	0	[2]
90 days or more past due and still accruing	0	[2]	0	[2]
Total loans past due and still accruing	0	[2]	0	[2]
Nonaccrual loans	18	[2]	20	[2]
Current loans	1,489	[1],[2]	1,427	[1],[2]
Total loans	1,507	[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	339	[1],[3]	314	[1],[3]
Total loans	340	[3]	315	[3]
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	65		36
60-89 days past due and still accruing	3		7
90 days or more past due and still accruing	5		4
Total loans past due and still accruing	73		47
Nonaccrual loans	162		156
Current loans	8,566	[1]	8,584	[1]
Total loans	8,801		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	25	[2]	9	[2]
60-89 days past due and still accruing	0	[2]	1	[2]
90 days or more past due and still accruing	1	[2]	0	[2]
Total loans past due and still accruing	26	[2]	10	[2]
Nonaccrual loans	58	[2]	51	[2]
Current loans	1,736	[1],[2]	1,617	[1],[2]
Total loans	1,820	[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	40	[3]	27	[3]
60-89 days past due and still accruing	3	[3]	6	[3]
90 days or more past due and still accruing	4	[3]	4	[3]
Total loans past due and still accruing	47	[3]	37	[3]
Nonaccrual loans	104	[3]	105	[3]
Current loans	6,830	[1],[3]	6,967	[1],[3]
Total loans	6,981	[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	849	[1]	845	[1]
Total loans	849		845
Business loans | International
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	6		0
60-89 days past due and still accruing	3		0
90 days or more past due and still accruing	0		3
Total loans past due and still accruing	9		3
Nonaccrual loans	0		4
Current loans	1,241	[1]	1,320	[1]
Total loans	1,250		1,327
Retail loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	23		25
60-89 days past due and still accruing	4		6
90 days or more past due and still accruing	2		5
Total loans past due and still accruing	29		36
Nonaccrual loans	82		88
Current loans	3,857	[1]	3,810	[1]
Total loans	3,968		3,934
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	15		15
60-89 days past due and still accruing	1		3
90 days or more past due and still accruing	0		0
Total loans past due and still accruing	16		18
Nonaccrual loans	48		53
Current loans	1,687	[1]	1,626	[1]
Total loans	1,751		1,697
Retail loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	8		10
60-89 days past due and still accruing	3		3
90 days or more past due and still accruing	2		5
Total loans past due and still accruing	13		18
Nonaccrual loans	34		35
Current loans	2,170	[1]	2,184	[1]
Total loans	2,217		2,237
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	6		6
60-89 days past due and still accruing	3		2
90 days or more past due and still accruing	1		0
Total loans past due and still accruing	10		8
Nonaccrual loans	32		33
Current loans	1,491	[1]	1,476	[1]
Total loans	1,533		1,517
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	2		4
60-89 days past due and still accruing	0		1
90 days or more past due and still accruing	1		5
Total loans past due and still accruing	3		10
Nonaccrual loans	2		2
Current loans	679	[1]	708	[1]
Total loans	$ 684		$ 720

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

[2] Primarily loans to real estate developers.

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

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Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(in millions)	2014			2013
Service cost	$	7		$	9
Interest cost	22			19
Expected return on plan assets	(33		)	(33		)
Amortization of prior service cost	1			1
Amortization of net loss	8			19
Net periodic defined benefit cost	$	5		$	15

Non-Qualified Defined Benefit Pension Plan	Three Months Ended March 31,
(in millions)	2014			2013
Service cost	$	1		$	1
Interest cost	2			3
Amortization of prior service cost (credit)	(1		)	—
Amortization of net loss	2			2
Net periodic defined benefit cost	$	4		$	6

Postretirement Benefit Plan	Three Months Ended March 31,
(in millions)	2014			2013
Interest cost	$	1		$	1
Expected return on plan assets	(1		)	(1		)
Net periodic postretirement benefit cost	$	—		$	—

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Business Segment Information (Tables)

3 Months Ended

Mar. 31, 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
Three Months Ended March 31, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	371		$	146		$	46		$	(158	)	$	6		$	411
Provision for credit losses	16			2			(8		)	—			(1		)	9
Noninterest income	87			41			64			14			2			208
Noninterest expenses	146			171			78			3			8			406
Provision (benefit) for income taxes (FTE)	98			5			14			(55		)	3			65
Net income (loss)	$	198		$	9		$	26		$	(92	)	$	(2	)	$	139
Net credit-related charge-offs (recoveries)	$	11		$	4		$	(3	)	$	—		$	—		$	12
Selected average balances:
Assets	$	35,896		$	6,052		$	4,939		$	11,129		$	6,692		$	64,708
Loans	34,927			5,381			4,767			—			—			45,075
Deposits	27,023			21,361			3,816			353			217			52,770
Statistical data:
Return on average assets (a)	2.20		%	0.16		%	2.15		%	N/M			N/M			0.86		%
Efficiency ratio (b)	31.96			91.44			71.31			N/M			N/M			65.79

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Three Months Ended March 31, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	155		$	46		$	(167	)	$	7		$	416
Provision for credit losses	20			6			(6		)	—			(4		)	16
Noninterest income	90			41			65			14			3			213
Noninterest expenses	146			175			79			3			13			416
Provision (benefit) for income taxes (FTE)	101			5			13			(58		)	2			63
Net income (loss)	$	198		$	10		$	25		$	(98	)	$	(1	)	$	134
Net credit-related charge-offs	$	16		$	8		$	—		$	—		$	—		$	24
Selected average balances:
Assets	$	35,780		$	5,973		$	4,738		$	11,747		$	5,213		$	63,451
Loans	34,753			5,276			4,588			—			—			44,617
Deposits	25,514			21,049			3,682			275			172			50,692
Statistical data:
Return on average assets (a)	2.21		%	0.18		%	2.12		%	N/M			N/M			0.84		%
Efficiency ratio (b)	31.38			89.37			71.09			N/M			N/M			66.15

(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
Three Months Ended March 31, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	183		$	172		$	136		$	72		$	(152	)	$	411
Provision for credit losses	3			11			6			(10		)	(1		)	9
Noninterest income	87			34			31			40			16			208
Noninterest expenses	161			96			90			48			11			406
Provision (benefit) for income taxes (FTE)	38			36			25			18			(52		)	65
Net income (loss)	$	68		$	63		$	46		$	56		$	(94	)	$	139
Net credit-related charge-offs (recoveries)	$	—		$	10		$	6		$	(4	)	$	—		$	12
Selected average balances:
Assets	$	13,819		$	15,133		$	11,070		$	6,865		$	17,821		$	64,708
Loans	13,473			14,824			10,364			6,414			—			45,075
Deposits	20,642			14,782			10,875			5,901			570			52,770
Statistical data:
Return on average assets (a)	1.26		%	1.59		%	1.50		%	3.28		%	N/M			0.86		%
Efficiency ratio (b)	59.71			46.72			53.83			43.39			N/M			65.79

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended March 31, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	190		$	171		$	134		$	81		$	(160	)	$	416
Provision for credit losses	(7		)	21			8			(2		)	(4		)	16
Noninterest income	92			35			31			38			17			213
Noninterest expenses	168			97			91			44			16			416
Provision (benefit) for income taxes (FTE)	43			32			23			21			(56		)	63
Net income (loss)	$	78		$	56		$	43		$	56		$	(99	)	$	134
Net credit-related charge-offs	$	5		$	10		$	6		$	3		$	—		$	24
Selected average balances:
Assets	$	14,042		$	13,795		$	10,795		$	7,859		$	16,960		$	63,451
Loans	13,650			13,542			10,071			7,354			—			44,617
Deposits	20,254			14,356			9,959			5,676			447			50,692
Statistical data:
Return on average assets (a)	1.47		%	1.45		%	1.54		%	2.86		%	N/M			0.84		%
Efficiency ratio (b)	59.53			47.04			54.99			37.41			N/M			66.15

(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

3 Months Ended

Mar. 31, 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 three months ended March 31, 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.

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 a $13 million increase to both "other noninterest income" and "provision for income taxes" for the three months ended March 31, 2013. 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.

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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				3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014 Restatement Adjustment [Member]	Mar. 31, 2013 Restatement Adjustment [Member]	Jan. 02, 2013 Restatement Adjustment [Member]	Mar. 31, 2014 Retained Earnings	Mar. 31, 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	$ (3,991)		$ (3,888)				$ 3
Decrease to retained earnings	(7,283)	(6,985)	(7,150)	(6,939)				(6,414)	(6,017)	(6,318)	(5,928)	3
Increase to other noninterest income	33	38				13
Increase to provision for income taxes	64	63				13
Impact on net income	$ 139	$ 134			$ 0	$ 0		$ 139	$ 134
Impact on basic net income per common share	$ 0.76	$ 0.71			$ 0.00	$ 0.00
Impact on diluted net income per common share	$ 0.73	$ 0.70			$ 0.00	$ 0.00

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Investment Securities (Summary Of Investment Securities Available-For-Sale) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Amortized Cost	$ 9,501	[1]	$ 9,414	[1]
Gross Unrealized Gains	108	[1]	92	[1]
Gross Unrealized Losses	122	[1]	199	[1]
Investment securities available-for-sale	9,487	[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	9,133	[2]	9,023	[2]
Gross Unrealized Gains	107	[2]	91	[2]
Gross Unrealized Losses	117	[2]	188	[2]
Investment securities available-for-sale	9,123	[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	54		56
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Investment securities available-for-sale	54		56
Equity and Other Non-Debt Securities
Amortized Cost	245		266
Gross Unrealized Gains	1		1
Gross Unrealized Losses	4		9
Investment securities available-for-sale	242		258
Auction-Rate Securities [Member]
Amortized Cost	146		169
Investment securities available-for-sale	$ 142		$ 159

[1] Included auction-rate securities at amortized cost and fair value of $146 million and $142 million, respectively, as of March 31, 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 (Acquired Purchased Credit-Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Credit Quality And Allowance For Credit Losses [Abstract]
Carrying amount PCI loans	$ 5	$ 5
Outstanding balance	$ 35	$ 46

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Business Segment Information (Business Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Net interest income (expense) (FTE)	$ 411		$ 416
Provision for credit losses	9		16
Noninterest income	208		213
Noninterest expenses	406		416
Provision (benefit) for income taxes (FTE)	65		63
Net income (loss)	139		134
Net credit-related charge-offs (recoveries)	12		24
Assets, average	64,708		63,451
Loans, average	45,075		44,617
Deposits, average	52,770		50,692
Return on average assets	0.86%	[1]	0.84%	[1]
Efficiency ratio	65.79%	[2]	66.15%	[2]
Business Bank
Net interest income (expense) (FTE)	371		375
Provision for credit losses	16		20
Noninterest income	87		90
Noninterest expenses	146		146
Provision (benefit) for income taxes (FTE)	98		101
Net income (loss)	198		198
Net credit-related charge-offs (recoveries)	11		16
Assets, average	35,896		35,780
Loans, average	34,927		34,753
Deposits, average	27,023		25,514
Return on average assets	2.20%	[1]	2.21%	[1]
Efficiency ratio	31.96%	[2]	31.38%	[2]
Retail Bank
Net interest income (expense) (FTE)	146		155
Provision for credit losses	2		6
Noninterest income	41		41
Noninterest expenses	171		175
Provision (benefit) for income taxes (FTE)	5		5
Net income (loss)	9		10
Net credit-related charge-offs (recoveries)	4		8
Assets, average	6,052		5,973
Loans, average	5,381		5,276
Deposits, average	21,361		21,049
Return on average assets	0.16%	[1]	0.18%	[1]
Efficiency ratio	91.44%	[2]	89.37%	[2]
Wealth Management
Net interest income (expense) (FTE)	46		46
Provision for credit losses	(8)		(6)
Noninterest income	64		65
Noninterest expenses	78		79
Provision (benefit) for income taxes (FTE)	14		13
Net income (loss)	26		25
Net credit-related charge-offs (recoveries)	(3)		0
Assets, average	4,939		4,738
Loans, average	4,767		4,588
Deposits, average	3,816		3,682
Return on average assets	2.15%	[1]	2.12%	[1]
Efficiency ratio	71.31%	[2]	71.09%	[2]
Finance
Net interest income (expense) (FTE)	(158)		(167)
Provision for credit losses	0		0
Noninterest income	14		14
Noninterest expenses	3		3
Provision (benefit) for income taxes (FTE)	(55)		(58)
Net income (loss)	(92)		(98)
Net credit-related charge-offs (recoveries)	0		0
Assets, average	11,129		11,747
Loans, average	0		0
Deposits, average	353		275
Other
Net interest income (expense) (FTE)	6		7
Provision for credit losses	(1)		(4)
Noninterest income	2		3
Noninterest expenses	8		13
Provision (benefit) for income taxes (FTE)	3		2
Net income (loss)	(2)		(1)
Net credit-related charge-offs (recoveries)	0		0
Assets, average	6,692		5,213
Loans, average	0		0
Deposits, average	$ 217		$ 172

[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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Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
ASSETS
Cash and due from banks	$ 1,186		$ 1,140
Interest-bearing deposits with banks	4,434		5,311
Other short-term investments	105		112
Investment securities available-for-sale	9,487	[1]	9,307	[1]
Commercial loans	29,774		28,815
Real estate construction loans	1,847		1,762
Commercial mortgage loans	8,801		8,787
Lease financing	849		845
International loans	1,250		1,327
Residential mortgage loans	1,751		1,697
Consumer loans	2,217		2,237
Total loans	46,489		45,470
Less allowance for loan losses	(594)		(598)
Net loans	45,895		44,872
Premises and equipment	583		594
Accrued income and other assets	3,991		3,888
Total assets	65,681		65,224
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing deposits	23,955		23,875
Money market and interest-bearing checking deposits	22,485		22,332
Savings deposits	1,742		1,673
Customer certificates of deposit	5,099		5,063
Foreign office time deposits	469		349
Total interest-bearing deposits	29,795		29,417
Total deposits	53,750		53,292
Short-term borrowings	160		253
Accrued expenses and other liabilities	954		986
Medium- and long-term debt	3,534		3,543
Total liabilities	58,398		58,074
Common stock - $5 par value: Authorized - 325,000,000 shares; Issued - 228,164,824 shares	1,141		1,141
Capital surplus	2,182		2,179
Accumulated other comprehensive loss	(325)		(391)
Retained earnings	6,414		6,318
Less cost of common stock in treasury - 46,492,524 shares at 3/31/14 and 45,860,786 shares at 12/31/13	(2,129)		(2,097)
Total shareholders' equity	7,283		7,150
Total liabilities and shareholders' equity	$ 65,681		$ 65,224

[1] Included auction-rate securities at amortized cost and fair value of $146 million and $142 million, respectively, as of March 31, 2014 and $169 million and $159 million, respectively, as of December 31, 2013.

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Credit Quality And Allowance For Credit Losses (Loans By Credit Quality Indicator) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 46,489		$ 45,470
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	44,350	[1]	43,210	[1]
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	836	[2]	860	[2]
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	986	[3]	1,050	[3]
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	317	[4]	350	[4]
Business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	42,521		41,536
Business loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,484	[1]	39,392	[1]
Business loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	831	[2]	850	[2]
Business loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	971	[3]	1,032	[3]
Business loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	235	[4]	262	[4]
Business loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	29,774		28,815
Business loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	28,427	[1]	27,470	[1]
Business loans | Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	601	[2]	590	[2]
Business loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	692	[3]	674	[3]
Business loans | Commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	54	[4]	81	[4]
Business loans | Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,847		1,762
Business loans | Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,802	[1]	1,713	[1]
Business loans | Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	13	[2]	13	[2]
Business loans | Real estate construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	13	[3]	15	[3]
Business loans | Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	19	[4]	21	[4]
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,507	[5]	1,447	[5]
Business loans | Real estate construction | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,463	[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	13	[2],[5]	13	[2],[5]
Business loans | Real estate construction | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	13	[3],[5]	15	[3],[5]
Business loans | Real estate construction | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	18	[4],[5]	20	[4],[5]
Business loans | Real estate construction | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	340	[6]	315	[6]
Business loans | Real estate construction | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	339	[1],[6]	314	[1],[6]
Business loans | Real estate construction | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[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	8,801		8,787
Business loans | Commercial mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,177	[1]	8,070	[1]
Business loans | Commercial mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	205	[2]	237	[2]
Business loans | Commercial mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	257	[3]	324	[3]
Business loans | Commercial mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	162	[4]	156	[4]
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,820	[5]	1,678	[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,647	[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	68	[2],[5]	92	[2],[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	47	[3],[5]	61	[3],[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	58	[4],[5]	51	[4],[5]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,981	[6]	7,109	[6]
Business loans | Commercial mortgage | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,530	[1],[6]	6,596	[1],[6]
Business loans | Commercial mortgage | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	137	[2],[6]	145	[2],[6]
Business loans | Commercial mortgage | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	210	[3],[6]	263	[3],[6]
Business loans | Commercial mortgage | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	104	[4],[6]	105	[4],[6]
Business loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans	849		845
Business loans | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	845	[1]	841	[1]
Business loans | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	3	[2]	3	[2]
Business loans | Lease financing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1	[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	1,250		1,327
Business loans | International | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,233	[1]	1,298	[1]
Business loans | International | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	9	[2]	7	[2]
Business loans | International | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	8	[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	3,968		3,934
Retail loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,866	[1]	3,818	[1]
Retail loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	5	[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	82	[4]	88	[4]
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,751		1,697
Retail loans | Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,696	[1]	1,635	[1]
Retail loans | Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	1	[2]	3	[2]
Retail loans | Residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	6	[3]	6	[3]
Retail loans | Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	48	[4]	53	[4]
Retail loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,217		2,237
Retail loans | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,170	[1]	2,183	[1]
Retail loans | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	4	[2]	7	[2]
Retail loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	9	[3]	12	[3]
Retail loans | Consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	34	[4]	35	[4]
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,533		1,517
Retail loans | Consumer | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,492	[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	7	[3]	5	[3]
Retail loans | Consumer | Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	32	[4]	33	[4]
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	684		720
Retail loans | Consumer | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	678	[1]	708	[1]
Retail loans | Consumer | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	[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	$ 2	[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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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$ 0.19	$ 0.17

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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	Mar. 31, 2014	Dec. 31, 2013
Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	$ 28,848	$ 29,617
Commercial And Other [Member] | Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	26,925	27,728
Bankcard, Revolving Check Credit And Home Equity Loan Commitments [Member] | Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	1,923	1,889
Standby Letters Of Credit [Member]
Loss contingency, range of possible loss, maximum	4,171	4,297
Commercial Letters Of Credit [Member]
Loss contingency, range of possible loss, maximum	96	103
Other Credit-Related Financial Instruments [Member]
Loss contingency, estimate of possible loss	$ 2	$ 2

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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
	Mar. 31, 2014		Mar. 31, 2013
Warrants
Balance at beginning of period	$ 3		$ 3
Realized gains (losses) recorded in earnings	0		1	[1]
Unrealized gains (losses) recorded in earnings	1	[1]	0
Gains (losses) recorded in other comprehensive income	0		0
Sales	(1)		(1)
Balance at end of period	3		3
Other Derivative Liabilities
Balance at beginnning of period	2		1
Realized gains (losses) recorded in earnings	0		0
Unrealized gains (losses) recorded in earnings	0		0
Gains (losses) recorded in other comprehensive income	0		0
Sales	0		0
Balance at end of period	2		1
Investment Securities Available-For-Sale [Member]
Balance at beginning of period	159		180
Realized gains (losses) recorded in earnings	1	[2]	0
Unrealized gains (losses) recorded in earnings	0		0
Gains (losses) recorded in other comprehensive income	6	[3]	1	[3]
Sales	(24)		(4)
Balance at end of period	142		177
State And Municipal Securities | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	22	[4]	23	[4]
Realized gains (losses) recorded in earnings	0	[4]	0	[4]
Unrealized gains (losses) recorded in earnings	0	[4]	0	[4]
Gains (losses) recorded in other comprehensive income	1	[3],[4]	0	[4]
Sales	0	[4]	0	[4]
Balance at end of period	23	[4]	23	[4]
Corporate Debt Securities | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	1	[4]	1	[4]
Realized gains (losses) recorded in earnings	0	[4]	0	[4]
Unrealized gains (losses) recorded in earnings	0	[4]	0	[4]
Gains (losses) recorded in other comprehensive income	0	[4]	0	[4]
Sales	0	[4]	0	[4]
Balance at end of period	1	[4]	1	[4]
Equity and Other Non-Debt Securities | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	136	[4]	156	[4]
Realized gains (losses) recorded in earnings	1	[2],[4]	0	[4]
Unrealized gains (losses) recorded in earnings	0	[4]	0	[4]
Gains (losses) recorded in other comprehensive income	5	[3],[4]	1	[3],[4]
Sales	(24)	[4]	(4)	[4]
Balance at end of period	$ 118	[4]	$ 153	[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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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 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	94	(18)
Investment securities, Provision (benefit) for income taxes	33	(7)
Investment securities, Net unrealized holding gains (losses) arising during period, net of tax	61	(11)
Investment securities, Net realized gains included in net securities gains	1	0
Investment securities, Provision for income taxes	0	0
Investment securities, Reclassification adjustment for net securities gains included in net income, net of tax	1	0
Investment securities, Change in net unrealized (losses) gains on investment securities available-for-sale, net of tax	60	(11)
Investment securities, Balance at end of period, net of tax	(8)	139
Benefit plans, Balance at beginning of period, net of tax	(323)	(563)
Benefit plans, Net defined benefit pension and other postretirement plans adjustment arising during the period, net of tax	0	0
Less: Amortization of actuarial net loss	(10)	(21)
Less: Amortization of prior service cost	0	(1)
Benefit plans, Amounts recognized in employee benefits expense	(10)	(22)
Benefit plans, Benefit for income taxes	(4)	(8)
Benefit plans, Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax	(6)	(14)
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax	6	14
Benefit plans, Balance at end of period, net of tax	(317)	(549)
Total accumulated other comprehensive loss at end of period, net of tax	$ (325)	$ (410)	$ (391)

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2014 and December 31, 2013.

(in millions)	Total		Level 1		Level 2		Level 3
March 31, 2014
Trading securities:
Deferred compensation plan assets	$	97	$	97	$	—	$	—
Equity and other non-debt securities	1		1		—		—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	1		—		1		—
Corporate debt securities	1		—		1		—
Total trading securities	103		98		5		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	45		45		—		—
Residential mortgage-backed securities (a)	9,123		—		9,123		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	54		—		53		1		(b)
Equity and other non-debt securities	242		124		—		118		(b)
Total investment securities available-for-sale	9,487		169		9,176		142
Derivative assets:
Interest rate contracts	358		—		358		—
Energy derivative contracts	103		—		103		—
Foreign exchange contracts	18		—		18		—
Warrants	3		—		—		3
Total derivative assets	482		—		479		3
Total assets at fair value	$	10,072	$	267	$	9,660	$	145
Derivative liabilities:
Interest rate contracts	$	118	$	—	$	118	$	—
Energy derivative contracts	101		—		101		—
Foreign exchange contracts	17		—		17		—
Other	2		—		—		2
Total derivative liabilities	238		—		236		2
Deferred compensation plan liabilities	97		97		—		—
Total liabilities at fair value	$	335	$	97	$	236	$	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.

(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 months ended March 31, 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
Three Months Ended March 31, 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		1		(c)	—			5		(b)	(24		)	118
Total investment securities available-for-sale	159		1		(c)	—			6		(b)	(24		)	142
Derivative assets:
Warrants	3		—			1		(d)	—			(1		)	3
Derivative liabilities:
Other	2		—			—			—			—			2
Three Months Ended March 31, 2013
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)	156		—			—			1		(b)	(4		)	153
Total investment securities available-for-sale	180		—			—			1		(b)	(4		)	177
Derivative assets:
Warrants	3		1		(d)	—			—			(1		)	3
Derivative liabilities:
Other	1		—			—			—			—			1

(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 March 31, 2014 and December 31, 2013 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at March 31, 2014 and December 31, 2013.

(in millions)	Level 3
March 31, 2014
Loans:
Commercial	$	20
Real estate construction	17
Commercial mortgage	74
Total loans	111
Nonmarketable equity securities	2
Other real estate	3
Total assets at fair value	$	116
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 March 31, 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 the low interest rate environment continuing into 2015. The March 31, 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)
March 31, 2014
State and municipal securities (a)	$	23	4% - 9%	1 - 4
Equity and other non-debt securities (a)	118		5% - 7%	1 - 3
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
March 31, 2014
Assets
Cash and due from banks	$	1,186		$	1,186		$	1,186	$	—	$	—
Interest-bearing deposits with banks	4,434			4,434			4,434		—		—
Loans held-for-sale	2			2			—		2		—
Total loans, net of allowance for loan losses (a)	45,895			45,932			—		—		45,932
Customers’ liability on acceptances outstanding	12			12			12		—		—
Nonmarketable equity securities (b)	12			19			—		—		19
Restricted equity investments	133			133			133		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,955			23,955			—		23,955		—
Interest-bearing deposits	24,696			24,696			—		24,696		—
Customer certificates of deposit	5,099			5,090			—		5,090		—
Total deposits	53,750			53,741			—		53,741		—
Short-term borrowings	160			160			160		—		—
Acceptances outstanding	12			12			12		—		—
Medium- and long-term debt	3,534			3,527			—		3,527		—
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 $111 million and $128 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2014 and December 31, 2013, respectively.

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

XML

Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) (Nonrecurring [Member], Level 3, USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 111	$ 128
Nonmarketable equity securities	2	2
Other real estate	3	5
Total assets at fair value	116	135
Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	20	43
Real estate construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	17	20
Commercial mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	74	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)

3 Months Ended

Mar. 31, 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
March 31, 2014
Business loans:
Commercial	$	30	$	20	$	3	$	53	$	54	$	29,667	$	29,774
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		18		1,489		1,507
Other business lines (b)	—		—		—		—		1		339		340
Total real estate construction	—		—		—		—		19		1,828		1,847
Commercial mortgage:
Commercial Real Estate business line (a)	25		—		1		26		58		1,736		1,820
Other business lines (b)	40		3		4		47		104		6,830		6,981
Total commercial mortgage	65		3		5		73		162		8,566		8,801
Lease financing	—		—		—		—		—		849		849
International	6		3		—		9		—		1,241		1,250
Total business loans	101		26		8		135		235		42,151		42,521
Retail loans:
Residential mortgage	15		1		—		16		48		1,687		1,751
Consumer:
Home equity	6		3		1		10		32		1,491		1,533
Other consumer	2		—		1		3		2		679		684
Total consumer	8		3		2		13		34		2,170		2,217
Total retail loans	23		4		2		29		82		3,857		3,968
Total loans	$	124	$	30	$	10	$	164	$	317	$	46,008	$	46,489
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 $5 million at both March 31, 2014 and 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
March 31, 2014
Business loans:
Commercial	$	28,427	$	601	$	692	$	54	$	29,774
Real estate construction:
Commercial Real Estate business line (e)	1,463		13		13		18		1,507
Other business lines (f)	339		—		—		1		340
Total real estate construction	1,802		13		13		19		1,847
Commercial mortgage:
Commercial Real Estate business line (e)	1,647		68		47		58		1,820
Other business lines (f)	6,530		137		210		104		6,981
Total commercial mortgage	8,177		205		257		162		8,801
Lease financing	845		3		1		—		849
International	1,233		9		8		—		1,250
Total business loans	40,484		831		971		235		42,521
Retail loans:
Residential mortgage	1,696		1		6		48		1,751
Consumer:
Home equity	1,492		2		7		32		1,533
Other consumer	678		2		2		2		684
Total consumer	2,170		4		9		34		2,217
Total retail loans	3,866		5		15		82		3,968
Total loans	$	44,350	$	836	$	986	$	317	$	46,489
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)	March 31, 2014		December 31, 2013
Nonaccrual loans	$	317	$	350
Reduced-rate loans (a)	21		24
Total nonperforming loans	338		374
Foreclosed property	14		9
Total nonperforming assets	$	352	$	383

(a) Reduced-rate business loans totaled $4 million at both March 31, 2014 and December 31, 2013, and reduced-rate retail loans totaled $17 million and $20 million at March 31, 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 March 31,
Allowance for loan losses:
Balance at beginning of period	$	531		$	67		$	598		$	552		$	77		$	629
Loan charge-offs	(27		)	(3		)	(30		)	(34		)	(4		)	(38		)
Recoveries on loans previously charged-off	16			2			18			12			2			14
Net loan charge-offs	(11		)	(1		)	(12		)	(22		)	(2		)	(24		)
Provision for loan losses	10			(2		)	8			14			(2		)	12
Balance at end of period	$	530		$	64		$	594		$	544		$	73		$	617
As a percentage of total loans	1.25		%	1.62		%	1.28		%	1.32		%	1.97		%	1.37		%
March 31
Allowance for loan losses:
Individually evaluated for impairment	$	39		$	—		$	39		$	60		$	—		$	60
Collectively evaluated for impairment	491			64			555			484			73			557
Total allowance for loan losses	$	530		$	64		$	594		$	544		$	73		$	617
Loans:
Individually evaluated for impairment	$	204		$	49		$	253		$	355		$	42		$	397
Collectively evaluated for impairment	42,315			3,916			46,231			40,964			3,677			44,641
PCI loans (a)	2			3			5			24			5			29
Total loans evaluated for impairment	$	42,521		$	3,968		$	46,489		$	41,343		$	3,724		$	45,067

(a)    No allowance for loan losses was required for PCI loans at March 31, 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 March 31,
(in millions)	2014		2013
Balance at beginning of period	$	36	$	32
Provision for credit losses on lending-related commitments	1		4
Balance at end of period	$	37	$	36

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
March 31, 2014
Business loans:
Commercial	$	13	$	38	$	51	$	95	$	8
Real estate construction:
Commercial Real Estate business line (a)	—		18		18		21		3
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		18		18		22		3
Commercial mortgage:
Commercial Real Estate business line (a)	—		65		65		108		13
Other business lines (b)	1		68		69		95		15
Total commercial mortgage	1		133		134		203		28
International	1		—		1		1		—
Total business loans	15		189		204		321		39
Retail loans:
Residential mortgage	32		—		32		38		—
Consumer:
Home equity	13		—		13		19		—
Other consumer	4		—		4		6		—
Total consumer	17		—		17		25		—
Total retail loans (c)	49		—		49		63		—
Total individually evaluated impaired loans	$	64	$	189	$	253	$	384	$	39
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 March 31,
Business loans:
Commercial	$	62	$	—	$	114	$	1
Real estate construction:
Commercial Real Estate business line (a)	19		—		27		—
Commercial mortgage:
Commercial Real Estate business line (a)	62		—		96		—
Other business lines (b)	67		1		124		—
Total commercial mortgage	129		1		220		—
Lease financing	—		—		1		—
International	3		—		—		—
Total business loans	213		1		362		1
Retail loans:
Residential mortgage	34		—		37		—
Consumer loans:
Home equity	12		—		6		—
Other consumer	4		—		4		—
Total consumer	16		—		10		—
Total retail loans	50		—		47		—
Total individually evaluated impaired loans	$	263	$	1	$	409	$	1

(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 March 31, 2014 and 2013 of loans considered to be TDRs that were restructured during the three months ended March 31, 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)			AB Note Restructures (b)		Total Modifications
Three Months Ended March 31
Business loans:
Commercial	$	1		$	—	$	1	$	7		$	—	$	7
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		16			—		16
Other business lines (d)	8			—		8		6			11		17
Total commercial mortgage	8			—		8		22			11		33
International	1			—		1		—			—		—
Total business loans	10			—		10		29			11		40
Retail loans:
Residential mortgage	—			—		—		1		(e)	—		1
Consumer:
Home equity	1		(e)	1		2		1		(e)	—		1
Other consumer	—			—		—		1		(e)	—		1
Total consumer	1			1		2		2			—		2
Total retail loans	1			1		2		3			—		3
Total loans	$	11		$	1	$	12	$	32		$	11	$	43

(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 March 31, 2014 and 2013 of loans modified by principal deferral during the twelve months ended March 31, 2014 and 2013, and those principal deferrals which experienced a subsequent default during the three months ended March 31, 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 March 31			Subsequent Default in the Three Months Ended March 31		Balance at March 31			Subsequent Default in the Three Months Ended March 31
Principal deferrals:
Business loans:
Commercial	$	13		$	2	$	12		$	1
Real estate construction:
Commercial Real Estate business line (a)	—			—		1			—
Commercial mortgage:
Commercial Real Estate business line (a)	17			—		36			16
Other business lines (b)	12			—		17			4
Total commercial mortgage	29			—		53			20
International	1			—		—			—
Total business loans	43			2		66			21
Retail loans:
Residential mortgage	3		(c)	—		5		(c)	—
Consumer:
Home equity	6		(c)	—		4		(c)	—
Other consumer	2		(c)	—		2		(c)	—
Total consumer	8			—		6			—
Total retail loans	11			—		11			—
Total principal deferrals	$	54		$	2	$	77		$	21

(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 March 31, 2014 and 2013, loans with a carrying value of $6 million and $4 million, respectively, were modified by interest rate reduction and loans with a carrying value of $8 million and $30 million, respectively, 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 months ended March 31, 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 March 31, 2014 and December 31, 2013 were as follows.

(in millions)	March 31, 2014		December 31, 2013
Acquired PCI loans:
Carrying amount	$	5	$	5
Outstanding balance (principal and unpaid interest)	35		46

Accretable Yield For Acquired Purchased Credit-Impaired Loans

Changes in the accretable yield for acquired PCI loans for the three months ended March 31, 2014 and 2013 were as follows.

	Three Months Ended March 31,
(in millions)	2014			2013
Balance at beginning of period	$	15		$	16
Reclassifications from nonaccretable	5			—
Accretion	(9		)	(4		)
Balance at end of period	$	11		$	12

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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
	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Net periodic defined benefit cost	$ 9	$ 21
Defined Benefit Pension Plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	9
Interest cost	22	19
Expected return on plan assets	(33)	(33)
Amortization of prior service cost (credit)	1	1
Amortization of net loss	8	19
Net periodic defined benefit cost	5	15
Defined Benefit Pension Plans | Non-Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	2	3
Amortization of prior service cost (credit)	(1)	0
Amortization of net loss	2	2
Net periodic defined benefit cost	4	6
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Net periodic defined benefit cost	$ 0	$ 0

XML

Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES
Net income	$ 139	$ 134
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	9	16
Provision (benefit) for deferred income taxes	(5)	29
Depreciation and amortization	29	30
Net periodic defined benefit cost	9	21
Share-based compensation expense	14	10
Net amortization of securities	2	10
Accretion of loan purchase discount	(12)	(11)
Net securities gains	(1)	0
Net gain on foreclosed property sold	(1)	(1)
Excess tax benefits from share-based compensation arrangements	(5)	(1)
Net change in trading securities	5	10
Net change in accrued income receivable	0	(10)
Net change in accrued expenses payable	(61)	(72)
Other, net	92	94
Net cash provided by operating activities	214	259
INVESTING ACTIVITIES
Maturities and redemptions of investment securities available-for-sale	411	938
Purchases of investment securities available-for-sale	(499)	(955)
Net change in loans	(1,026)	971
Proceeds from sales of foreclosed property	3	18
Net increase in premises and equipment	(16)	(19)
Other, net	(1)	5
Net cash (used in) provided by investing activities	(1,128)	958
FINANCING ACTIVITIES
Net change in deposits	255	0
Net change in short-term borrowings	(93)	(52)
Repurchases of common stock	(80)	(74)
Cash dividends paid on common stock	(31)	(29)
Issuances of common stock under employee stock plans	26	5
Excess tax benefits from share-based compensation arrangements	5	1
Other, net	1	(5)
Net cash provided by (used in) financing activities	83	(154)
Net (decrease) increase in cash and cash equivalents	(831)	1,063
Cash and cash equivalents at beginning of period	6,451	4,534
Cash and cash equivalents at end of period	5,620	5,597
Interest paid	25	29
Income taxes and tax-related interest paid	0	1
Noncash investing and financing activities:
Loans transferred to other real estate	$ 7	$ 5

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Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 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	46,492,524	45,860,786

XML

Employee Benefit Plans

3 Months Ended

Mar. 31, 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 March 31,
(in millions)	2014			2013
Service cost	$	7		$	9
Interest cost	22			19
Expected return on plan assets	(33		)	(33		)
Amortization of prior service cost	1			1
Amortization of net loss	8			19
Net periodic defined benefit cost	$	5		$	15

Non-Qualified Defined Benefit Pension Plan	Three Months Ended March 31,
(in millions)	2014			2013
Service cost	$	1		$	1
Interest cost	2			3
Amortization of prior service cost (credit)	(1		)	—
Amortization of net loss	2			2
Net periodic defined benefit cost	$	4		$	6

Postretirement Benefit Plan	Three Months Ended March 31,
(in millions)	2014			2013
Interest cost	$	1		$	1
Expected return on plan assets	(1		)	(1		)
Net periodic postretirement benefit cost	$	—		$	—

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.

XML

Document And Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 25, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 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	Q1
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		181,673,675
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

XML

Income Taxes And Tax-Related Items

3 Months Ended

Mar. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes and Tax-Related Items

INCOME TAXES AND TAX-RELATED ITEMS

Net unrecognized tax benefits were $11 million at both March 31, 2014 and December 31, 2013. 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 $7 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 March 31, 2014 and December 31, 2013.

Net deferred tax assets were $224 million at March 31, 2014, compared to $256 million at December 31, 2013. The decrease of $32 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 March 31, 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
	Mar. 31, 2014	Mar. 31, 2013
INTEREST INCOME
Interest and fees on loans	$ 376	$ 390
Interest on investment securities	55	53
Interest on short-term investments	4	3
Total interest income	435	446
INTEREST EXPENSE
Interest on deposits	11	15
Interest on medium- and long-term debt	14	15
Total interest expense	25	30
Net interest income	410	416
Provision for credit losses	9	16
Net interest income after provision for credit losses	401	400
NONINTEREST INCOME
Service charges on deposit accounts	54	55
Fiduciary income	44	43
Commercial lending fees	20	21
Card Fees	19	17
Letter of credit fees	14	16
Bank-owned life insurance	9	9
Foreign exchange income	9	9
Brokerage fees	5	5
Net securities gains	1	0
Other noninterest income	33	38
Total noninterest income	208	213
NONINTEREST EXPENSES
Salaries and benefits expense	247	251
Net occupancy expense	40	39
Equipment expense	14	15
Outside processing fee expense	28	28
Software expense	22	22
Litigation-related expense	3	3
FDIC insurance expense	8	9
Advertising expense	6	6
Other noninterest expenses	38	43
Total noninterest expenses	406	416
Income before income taxes	203	197
Provision for income taxes	64	63
Net Income	139	134
Less income allocated to participating securities	2	2
Net income attributable to common shares	137	132
Basic earnings per common share	$ 0.76	$ 0.71
Diluted earnings per common share	$ 0.73	$ 0.70
Comprehensive income	205	137
Cash dividends declared on common stock	$ 35	$ 32
Cash dividends declared per common share	$ 0.19	$ 0.17

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Derivative And Credit-Related Financial Instruments

3 Months Ended

Mar. 31, 2014

Derivative And Credit-Related Financial Instruments [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 March 31, 2014, counterparties with bilateral collateral agreements had pledged $117 million of marketable investment securities and deposited $3 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had pledged $8 million of investment securities and posted $19 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 March 31, 2014 was $7 million, for which the Corporation had pledged collateral of $3 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 March 31, 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 March 31, 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.

	March 31, 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	$	1,450	$	191		$	—		$	1,450	$	198		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	446		1			1			253		1			—
Total risk management purposes	1,896		192			1			1,703		199			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	268		—			1			277		—			1
Caps and floors purchased	268		1			—			277		1			—
Swaps	11,282		166			117			11,143		181			132
Total interest rate contracts	11,818		167			118			11,697		182			133
Energy contracts:
Caps and floors written	1,180		1			43			1,325		1			48
Caps and floors purchased	1,180		43			1			1,325		48			1
Swaps	2,589		59			57			2,724		56			53
Total energy contracts	4,949		103			101			5,374		105			102
Foreign exchange contracts:
Spot, forwards, options and swaps	2,030		17			16			1,764		14			14
Total customer-initiated and other activities	18,797		287			235			18,835		301			249
Total gross derivatives	$	20,693	479			236			$	20,538	500			249
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(166		)	(166		)			(187		)	(187		)
Netting adjustment - Cash collateral received/posted			(1		)	(17		)			(2		)	(10		)
Net derivatives included in the consolidated balance sheets (b)			312			53					311			52
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(114		)	(8		)			(138		)	(10		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	198		$	45				$	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 totaled $2 million at both March 31, 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 March 31, 2014 and 2013. The Corporation recognized an insignificant amount of net gains (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 both the three-month periods ended March 31, 2014 and 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 both the three months ended March 31, 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 March 31, 2014 and December 31, 2013.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
March 31, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,450	3.2	5.45	%	0.35	%
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 March 31, 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 an insignificant amount of net gains in “other noninterest income” in the consolidated statements of comprehensive income for both the three-month periods ended March 31, 2014 and 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 March 31,
(in millions)	Location of Gain	2014		2013
Interest rate contracts	Other noninterest income	$	4	$	3
Energy contracts	Other noninterest income	—		1
Foreign exchange contracts	Foreign exchange income	9		9
Total		$	13	$	13

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)	March 31, 2014		December 31, 2013
Unused commitments to extend credit:
Commercial and other	$	26,925	$	27,728
Bankcard, revolving check credit and home equity loan commitments	1,923		1,889
Total unused commitments to extend credit	$	28,848	$	29,617
Standby letters of credit	$	4,171	$	4,297
Commercial letters of credit	96		103
Other credit-related financial instruments	2		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 March 31, 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 $37 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 $25 million and $28 million at March 31, 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 2020. 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 $250 million and $259 million, respectively, of the $4.3 billion and $4.4 billion standby and commercial letters of credit outstanding at March 31, 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 $65 million at March 31, 2014, including $53 million in deferred fees and $12 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 March 31, 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)	March 31, 2014			December 31, 2013
Total criticized standby and commercial letters of credit	$	92		$	69
As a percentage of total outstanding standby and commercial letters of credit	2.2		%	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 March 31, 2014 and December 31, 2013, the total notional amount of the credit risk participation agreements was approximately $583 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 $6 million and $7 million at March 31, 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 March 31, 2014, the weighted average remaining maturity of outstanding credit risk participation agreements was 2.5 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 $2 million at both March 31, 2014 and December 31, 2013.

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Credit Quality And Allowance For Credit Losses

3 Months Ended

Mar. 31, 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
March 31, 2014
Business loans:
Commercial	$	30	$	20	$	3	$	53	$	54	$	29,667	$	29,774
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		18		1,489		1,507
Other business lines (b)	—		—		—		—		1		339		340
Total real estate construction	—		—		—		—		19		1,828		1,847
Commercial mortgage:
Commercial Real Estate business line (a)	25		—		1		26		58		1,736		1,820
Other business lines (b)	40		3		4		47		104		6,830		6,981
Total commercial mortgage	65		3		5		73		162		8,566		8,801
Lease financing	—		—		—		—		—		849		849
International	6		3		—		9		—		1,241		1,250
Total business loans	101		26		8		135		235		42,151		42,521
Retail loans:
Residential mortgage	15		1		—		16		48		1,687		1,751
Consumer:
Home equity	6		3		1		10		32		1,491		1,533
Other consumer	2		—		1		3		2		679		684
Total consumer	8		3		2		13		34		2,170		2,217
Total retail loans	23		4		2		29		82		3,857		3,968
Total loans	$	124	$	30	$	10	$	164	$	317	$	46,008	$	46,489
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 $5 million at both March 31, 2014 and 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
March 31, 2014
Business loans:
Commercial	$	28,427	$	601	$	692	$	54	$	29,774
Real estate construction:
Commercial Real Estate business line (e)	1,463		13		13		18		1,507
Other business lines (f)	339		—		—		1		340
Total real estate construction	1,802		13		13		19		1,847
Commercial mortgage:
Commercial Real Estate business line (e)	1,647		68		47		58		1,820
Other business lines (f)	6,530		137		210		104		6,981
Total commercial mortgage	8,177		205		257		162		8,801
Lease financing	845		3		1		—		849
International	1,233		9		8		—		1,250
Total business loans	40,484		831		971		235		42,521
Retail loans:
Residential mortgage	1,696		1		6		48		1,751
Consumer:
Home equity	1,492		2		7		32		1,533
Other consumer	678		2		2		2		684
Total consumer	2,170		4		9		34		2,217
Total retail loans	3,866		5		15		82		3,968
Total loans	$	44,350	$	836	$	986	$	317	$	46,489
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)	March 31, 2014		December 31, 2013
Nonaccrual loans	$	317	$	350
Reduced-rate loans (a)	21		24
Total nonperforming loans	338		374
Foreclosed property	14		9
Total nonperforming assets	$	352	$	383

(a) Reduced-rate business loans totaled $4 million at both March 31, 2014 and December 31, 2013, and reduced-rate retail loans totaled $17 million and $20 million at March 31, 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 March 31,
Allowance for loan losses:
Balance at beginning of period	$	531		$	67		$	598		$	552		$	77		$	629
Loan charge-offs	(27		)	(3		)	(30		)	(34		)	(4		)	(38		)
Recoveries on loans previously charged-off	16			2			18			12			2			14
Net loan charge-offs	(11		)	(1		)	(12		)	(22		)	(2		)	(24		)
Provision for loan losses	10			(2		)	8			14			(2		)	12
Balance at end of period	$	530		$	64		$	594		$	544		$	73		$	617
As a percentage of total loans	1.25		%	1.62		%	1.28		%	1.32		%	1.97		%	1.37		%
March 31
Allowance for loan losses:
Individually evaluated for impairment	$	39		$	—		$	39		$	60		$	—		$	60
Collectively evaluated for impairment	491			64			555			484			73			557
Total allowance for loan losses	$	530		$	64		$	594		$	544		$	73		$	617
Loans:
Individually evaluated for impairment	$	204		$	49		$	253		$	355		$	42		$	397
Collectively evaluated for impairment	42,315			3,916			46,231			40,964			3,677			44,641
PCI loans (a)	2			3			5			24			5			29
Total loans evaluated for impairment	$	42,521		$	3,968		$	46,489		$	41,343		$	3,724		$	45,067

(a)    No allowance for loan losses was required for PCI loans at March 31, 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 March 31,
(in millions)	2014		2013
Balance at beginning of period	$	36	$	32
Provision for credit losses on lending-related commitments	1		4
Balance at end of period	$	37	$	36

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
March 31, 2014
Business loans:
Commercial	$	13	$	38	$	51	$	95	$	8
Real estate construction:
Commercial Real Estate business line (a)	—		18		18		21		3
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		18		18		22		3
Commercial mortgage:
Commercial Real Estate business line (a)	—		65		65		108		13
Other business lines (b)	1		68		69		95		15
Total commercial mortgage	1		133		134		203		28
International	1		—		1		1		—
Total business loans	15		189		204		321		39
Retail loans:
Residential mortgage	32		—		32		38		—
Consumer:
Home equity	13		—		13		19		—
Other consumer	4		—		4		6		—
Total consumer	17		—		17		25		—
Total retail loans (c)	49		—		49		63		—
Total individually evaluated impaired loans	$	64	$	189	$	253	$	384	$	39
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 March 31,
Business loans:
Commercial	$	62	$	—	$	114	$	1
Real estate construction:
Commercial Real Estate business line (a)	19		—		27		—
Commercial mortgage:
Commercial Real Estate business line (a)	62		—		96		—
Other business lines (b)	67		1		124		—
Total commercial mortgage	129		1		220		—
Lease financing	—		—		1		—
International	3		—		—		—
Total business loans	213		1		362		1
Retail loans:
Residential mortgage	34		—		37		—
Consumer loans:
Home equity	12		—		6		—
Other consumer	4		—		4		—
Total consumer	16		—		10		—
Total retail loans	50		—		47		—
Total individually evaluated impaired loans	$	263	$	1	$	409	$	1

(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 March 31, 2014 and 2013 of loans considered to be TDRs that were restructured during the three months ended March 31, 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)			AB Note Restructures (b)		Total Modifications
Three Months Ended March 31
Business loans:
Commercial	$	1		$	—	$	1	$	7		$	—	$	7
Commercial mortgage:
Commercial Real Estate business line (c)	—			—		—		16			—		16
Other business lines (d)	8			—		8		6			11		17
Total commercial mortgage	8			—		8		22			11		33
International	1			—		1		—			—		—
Total business loans	10			—		10		29			11		40
Retail loans:
Residential mortgage	—			—		—		1		(e)	—		1
Consumer:
Home equity	1		(e)	1		2		1		(e)	—		1
Other consumer	—			—		—		1		(e)	—		1
Total consumer	1			1		2		2			—		2
Total retail loans	1			1		2		3			—		3
Total loans	$	11		$	1	$	12	$	32		$	11	$	43

(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 March 31, 2014 and December 31, 2013, commitments to lend additional funds to borrowers whose terms have been modified in TDRs totaled $4 million.

The majority of the modifications considered to be TDRs that occurred during the three months ended March 31, 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 three months ended March 31, 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 March 31, 2014 and 2013 of loans modified by principal deferral during the twelve months ended March 31, 2014 and 2013, and those principal deferrals which experienced a subsequent default during the three months ended March 31, 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 March 31			Subsequent Default in the Three Months Ended March 31		Balance at March 31			Subsequent Default in the Three Months Ended March 31
Principal deferrals:
Business loans:
Commercial	$	13		$	2	$	12		$	1
Real estate construction:
Commercial Real Estate business line (a)	—			—		1			—
Commercial mortgage:
Commercial Real Estate business line (a)	17			—		36			16
Other business lines (b)	12			—		17			4
Total commercial mortgage	29			—		53			20
International	1			—		—			—
Total business loans	43			2		66			21
Retail loans:
Residential mortgage	3		(c)	—		5		(c)	—
Consumer:
Home equity	6		(c)	—		4		(c)	—
Other consumer	2		(c)	—		2		(c)	—
Total consumer	8			—		6			—
Total retail loans	11			—		11			—
Total principal deferrals	$	54		$	2	$	77		$	21

(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 March 31, 2014 and 2013, loans with a carrying value of $6 million and $4 million, respectively, were modified by interest rate reduction and loans with a carrying value of $8 million and $30 million, respectively, 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 months ended March 31, 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 March 31, 2014 and December 31, 2013. The nonaccretable yield on PCI loans was $9 million at March 31, 2014. The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at March 31, 2014 and December 31, 2013 were as follows.

(in millions)	March 31, 2014		December 31, 2013
Acquired PCI loans:
Carrying amount	$	5	$	5
Outstanding balance (principal and unpaid interest)	35		46

Changes in the accretable yield for acquired PCI loans for the three months ended March 31, 2014 and 2013 were as follows.

	Three Months Ended March 31,
(in millions)	2014			2013
Balance at beginning of period	$	15		$	16
Reclassifications from nonaccretable	5			—
Accretion	(9		)	(4		)
Balance at end of period	$	11		$	12

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 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
March 31, 2014
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,133		107		117		9,123
State and municipal securities	24		—		1		23
Corporate debt securities	54		—		—		54
Equity and other non-debt securities	245		1		4		242
Total investment securities available-for-sale (b)	$	9,501	$	108	$	122	$	9,487
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 $146 million and $142 million, respectively, as of March 31, 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 March 31, 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
March 31, 2014
Residential mortgage-backed securities (a)	$	4,797	$	111	$	138	$	6		$	4,935	$	117
State and municipal securities (b)	—		—		23		1			23		1
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		130		4			130		4
Total impaired securities	$	4,797	$	111	$	292	$	11		$	5,089	$	122
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.

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)
March 31, 2014	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	155	$	155
After one year through five years	268		269
After five years through ten years	277		287
After ten years	8,556		8,534
Subtotal	9,256		9,245
Equity and other non-debt securities	245		242
Total investment securities available-for-sale	$	9,501	$	9,487

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Contingent Liabilities

3 Months Ended

Mar. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Contingent Liabilities

CONTINGENT LIABILITIES

Legal Proceedings

Comerica Bank, a wholly owned subsidiary of the Corporation, was named a third-party defendant in Butte Local Development v. Masters Group v. Comerica Bank (“the case”), a lender liability case filed on November 16, 2011. The jury trial commenced January 6, 2014, in the Montana Second District Judicial Court for Silver Bow County in Butte, Montana ("the court"). The claims underlying the case against the Bank grew out of an initial, two-year $9 million revolving line of credit loan extended by the Bank to Masters in July 2006. The loan was subsequently increased to $10.5 million and expired by its terms in July 2008 and was later paid in full through collection actions initiated by the Bank in December 2008, following a default by Masters. Masters alleged that the Bank wrongfully collected the loan, causing Masters to cease operations, and claimed that as a result, they failed to repay a $200,000 loan that they owed to Butte Local Development (“BLD”). Masters did not dispute that it was required to repay the $10.5 million loan, but contended the Bank should have continued to give it more time.

Starting in July 2013, the Bank attempted to settle the case by offering to pay the debt owed by Masters to BLD. The Bank anticipated that such a settlement would improve the Bank's chances of defending the case in Federal court, the court in which Masters would have been required to sue the Bank, absent BLD’s claim. Those discussions and consideration of the settlement offer continued for several months. Accordingly, on September 30, 2013, the Corporation believed that a nominal loss was probable and recorded legal reserves for the settlement offer made to BLD.

On January 17, 2014, a jury awarded Masters $52 million for its claims against the Bank. The jury also awarded BLD $275,000 for its claims against Masters. 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.

On January 23, 2014, Masters filed motions for additional claims against the Corporation related to the case seeking court costs, pre-judgment interest, punitive damages above the statutory maximum permitted by the State of Montana and attorneys' fees. In March 2014, the court declined to increase the punitive damage award against the Bank above the amount awarded by the jury and declined the request by Masters for a percentage of the jury award in attorney's fees and instead allowed fees based on hourly rates. The Corporation stipulated to $2 million of attorney's fees and costs but reserved the right to appeal Masters' entitlement to such fees and costs. The Corporation accordingly increased its reserve related to the case to $54 million.

Masters filed a notice of their intent to appeal certain aspects of the court's ruling. The Corporation believes that it has meritorious defenses for this litigation and has appealed the jury's decision and certain rulings on the case, including the award for attorneys' fees, to the Montana Supreme Court, the sole appellate court for the state of Montana.

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 $5 million and $8 million were included in "other noninterest expenses" on the consolidated statements of income for the three months ended March 31, 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 $85 million at March 31, 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

3 Months Ended

Mar. 31, 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 three months ended March 31, 2014 and 2013, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Three Months Ended March 31,
(in millions)	2014			2013
Accumulated net unrealized (losses) gains 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	94			(18		)
Less: Provision (benefit) for income taxes	33			(7		)
Net unrealized holding gains (losses) arising during the period, net of tax	61			(11		)
Less:
Net realized gains included in net securities gains	1			—
Less: Provision for income taxes	—			—
Reclassification adjustment for net securities gains included in net income, net of tax	1			—
Change in net unrealized (losses) gains on investment securities available-for-sale, net of tax	60			(11		)
Balance at end of period, net of tax	$	(8	)	$	139
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(323	)	$	(563	)
Net defined benefit pension and other postretirement plans adjustment arising during the period, net of tax	—			—
Less:
Amortization of actuarial net loss	(10		)	(21		)
Amortization of prior service cost	—			(1		)
Amounts recognized in employee benefits expense	(10		)	(22		)
Less: Benefit for income taxes	(4		)	(8		)
Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax	(6		)	(14		)
Change in defined benefit pension and other postretirement plans adjustment, net of tax	6			14
Balance at end of period, net of tax	$	(317	)	$	(549	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(325	)	$	(410	)

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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	Mar. 31, 2014	Dec. 31, 2013
Derivative And Credit-Related Financial Instruments [Abstract]
Total criticized standby and commercial letters of credit	$ 92	$ 69
As a percentage of total outstanding standby and commercial letters of credit	2.20%	1.60%

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Variable Interest Entities (VIEs)

3 Months Ended

Mar. 31, 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 March 31, 2014 was limited to approximately $381 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 March 31, 2014 was limited to approximately $13 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 ($136 million at March 31, 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 three months ended March 31, 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 March 31,
(in millions)	2014			2013
Other noninterest income:
Amortization of other tax credit investments	$	(2	)	$	(1	)
Provision for income taxes:
Amortization of LIHTC investments	14			13
Low income housing tax credits	(14		)	(14		)
Other tax benefits related to tax credit entities	(6		)	(5		)
Total provision for income taxes	$	(6	)	$	(6	)

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

3 Months Ended

Mar. 31, 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)	March 31, 2014		December 31, 2013
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	315	$	318
Medium-term notes:
3.00% notes due 2015	299		299
Total parent company	614		617
Subsidiaries
Subordinated notes:
5.70% subordinated notes due 2014 (a)	252		255
5.75% subordinated notes due 2016 (a)	678		681
5.20% subordinated notes due 2017 (a)	561		566
8.375% subordinated notes due 2024 (callable at par in 2014)	183		183
7.875% subordinated notes due 2026 (a)	218		213
Total subordinated notes	1,892		1,898
Federal Home Loan Bank advance:
Floating-rate based on LIBOR indices due 2014	1,000		1,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	28		28
Total subsidiaries	2,920		2,926
Total medium- and long-term debt	$	3,534	$	3,543

(a) The carrying value of medium- and long-term debt has been adjusted to reflect the gain 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 collateralized by mortgage-related assets to its members. FHLB advances bear interest at variable rates based on LIBOR and were secured by a blanket lien on $14 billion of real estate-related loans at March 31, 2014.

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Net Income Per Common Share

3 Months Ended

Mar. 31, 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 March 31,
(in millions, except per share data)	2014		2013
Basic and diluted
Net income	$	139	$	134
Less:
Income allocated to participating securities	2		2
Net income attributable to common shares	$	137	$	132
Basic average common shares	180		185
Basic net income per common share	$	0.76	$	0.71
Basic average common shares	180		185
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	2		—
Net effect of the assumed exercise of warrants	5		2
Diluted average common shares	187		187
Diluted net income per common share	$	0.73	$	0.70

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 March 31,
(shares in millions)	2014	2013
Average outstanding options	8.7	15.1
Range of exercise prices	$48.17 - $61.94	$34.78 - $61.94

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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Debt Instruments [Line Items]
Total medium- and long-term debt	$ 3,534		$ 3,543
Parent Company
Debt Instruments [Line Items]
Total medium- and long-term debt	614		617
Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	1,892		1,898
Total medium- and long-term debt	2,920		2,926
4.80% subordinated notes due 2015 | Parent Company
Debt Instruments [Line Items]
Subordinated notes	315	[1]	318	[1]
Fixed Interest Rate	4.80%		4.80%
Maturity Date	May 01, 2015		May 01, 2015
3.00% notes due 2015 | Parent Company
Debt Instruments [Line Items]
Medium-term notes	299		299
Fixed Interest Rate	3.00%		3.00%
Maturity Date	Sep. 16, 2015		Sep. 16, 2015
5.70% subordinated notes due 2014 | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	252	[1]	255	[1]
Fixed Interest Rate	5.70%		5.70%
Maturity Date	Jun. 01, 2014		Jun. 01, 2014
5.75% subordinated notes due 2016 | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	678	[1]	681	[1]
Fixed Interest Rate	5.75%		5.75%
Maturity Date	Nov. 21, 2016		Nov. 21, 2016
5.20% subordinated notes due 2017 | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	561	[1]	566	[1]
Fixed Interest Rate	5.20%		5.20%
Maturity Date	Aug. 22, 2017		Aug. 22, 2017
8.375% subordinated notes due 2024 (callable at par in 2014) | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	183		183
Fixed Interest Rate	8.375%		8.375%
Maturity Date	Jul. 15, 2024		Jul. 15, 2024
Earliest call date	Jul. 15, 2014		Jul. 15, 2014
7.875% subordinated notes due 2026 | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	218	[1]	213	[1]
Fixed Interest Rate	7.875%		7.875%
Maturity Date	Sep. 15, 2026		Sep. 15, 2026
Federal Home Loan Bank advances floating-rate based on LIBOR indices due 2014 | Subsidiaries
Debt Instruments [Line Items]
Federal Home Loan Bank advances	1,000		1,000
Maturity Date	May 07, 2014		May 07, 2014
6.0% - 6.4% fixed-rate notes due 2020 | Subsidiaries
Debt Instruments [Line Items]
Other Notes	$ 28		$ 28
Fixed Interest Rate - minimum	6.00%		6.00%
Fixed Interest Rate - maximum	6.40%		6.40%
Maturity Date	Jun. 30, 2020		Jun. 30, 2020

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

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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
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 139	$ 134
Less income allocated to participating securities	2	2
Net income attributable to common shares	$ 137	$ 132
Basic average common shares	180	185
Basic earnings per common share	$ 0.76	$ 0.71
Basic average common shares	180	185
Net effect of the assumed exercise of stock options	2	0
Net effect of the assumed exercise of warrants	5	2
Diluted average common shares	187	187
Diluted earnings per common share	$ 0.73	$ 0.70

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Medium- And Long-Term Debt (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2014
Debt Disclosure [Abstract]
Blanket lien on real-estate related loans securing FHLB advances	$ 14

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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	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	$ 9,487	[1]	$ 9,307	[1]
Derivative assets	479		500
Derivative liabilities	53	[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	9,123	[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	54		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	242		258
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	103		108
Investment securities available-for-sale	9,487		9,307
Derivative assets	482		503
Total assets at fair value	10,072		9,918
Derivative liabilities	238		251
Deferred compensation plan liabilities	97		96
Total liabilities at fair value	335		347
Recurring [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	98		103
Investment securities available-for-sale	169		167
Derivative assets	0		0
Total assets at fair value	267		270
Derivative liabilities	0		0
Deferred compensation plan liabilities	97		96
Total liabilities at fair value	97		96
Recurring [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	5		5
Investment securities available-for-sale	9,176		8,981
Derivative assets	479		500
Total assets at fair value	9,660		9,486
Derivative liabilities	236		249
Deferred compensation plan liabilities	0		0
Total liabilities at fair value	236		249
Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Investment securities available-for-sale	142		159
Derivative assets	3		3
Total assets at fair value	145		162
Derivative liabilities	2		2
Deferred compensation plan liabilities	0		0
Total liabilities at fair value	2		2
Recurring [Member] | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	358		380
Derivative liabilities	118		133
Recurring [Member] | 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 [Member] | Interest Rate Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	358		380
Derivative liabilities	118		133
Recurring [Member] | 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 [Member] | Energy Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	103		105
Derivative liabilities	101		102
Recurring [Member] | 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 [Member] | Energy Derivative Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	103		105
Derivative liabilities	101		102
Recurring [Member] | 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 [Member] | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	18		15
Derivative liabilities	17		14
Recurring [Member] | 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 [Member] | Foreign Exchange Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	18		15
Derivative liabilities	17		14
Recurring [Member] | 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 [Member] | Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	3		3
Recurring [Member] | Warrants | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Recurring [Member] | Warrants | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Recurring [Member] | Warrants | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	3		3
Recurring [Member] | Other Derivative Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	2		2
Recurring [Member] | Other Derivative Liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0		0
Recurring [Member] | Other Derivative Liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0		0
Recurring [Member] | Other Derivative Liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	2		2
Recurring [Member] | Deferred Compensation Plan Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	97		96
Recurring [Member] | Deferred Compensation Plan Assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	97		96
Recurring [Member] | Deferred Compensation Plan Assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Recurring [Member] | Deferred Compensation Plan Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Recurring [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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	9,123	[3]	8,926	[3]
Recurring [Member] | 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 [Member] | 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	9,123	[3]	8,926	[3]
Recurring [Member] | 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 [Member] | State And Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	1		3
Investment securities available-for-sale	23		22
Recurring [Member] | 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 [Member] | State And Municipal Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	1		3
Investment securities available-for-sale	0		0
Recurring [Member] | 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 [Member] | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	1
Investment securities available-for-sale	54		56
Recurring [Member] | 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 [Member] | 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	53		55
Recurring [Member] | 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 [Member] | Equity and Other Non-Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	1		7
Investment securities available-for-sale	242		258
Recurring [Member] | Equity and Other Non-Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	1		7
Investment securities available-for-sale	124		122
Recurring [Member] | 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 [Member] | 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	$ 118	[4]	$ 136	[4]

[1] Included auction-rate securities at amortized cost and fair value of $146 million and $142 million, respectively, as of March 31, 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 totaled $2 million at both March 31, 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 (Troubled Debt Restructurings By Type Of Modification) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	$ 12		$ 43
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	11	[1]	32	[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	1
AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			11	[2]
Business loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	10		40
Business loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	10	[1]	29	[1]
Business loans | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0
Business loans | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			11	[2]
Business loans | Commercial
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1		7
Business loans | Commercial | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1]	7	[1]
Business loans | Commercial | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0
Business loans | Commercial | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]
Business loans | Commercial mortgage
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	8		33
Business loans | Commercial mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	8	[1]	22	[1]
Business loans | Commercial mortgage | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0
Business loans | Commercial mortgage | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			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]	16	[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]	16	[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]
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]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	8	[4]	17	[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	8	[1],[4]	6	[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]
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			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
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	2		3
Retail loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1]	3	[1]
Retail loans | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1
Retail loans | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]
Retail loans | Residential mortgage
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		1
Retail loans | Residential mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	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
Retail loans | Residential mortgage | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]
Retail loans | Consumer
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	2		2
Retail loans | Consumer | Home equity
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	2		1
Retail loans | Consumer | Other consumer
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0		1
Retail loans | Consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1]	2	[1]
Retail loans | Consumer | Principal Deferrals | Home equity
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1],[5]	1	[1],[5]
Retail loans | Consumer | Principal Deferrals | Other consumer
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[1]	1	[1],[5]
Retail loans | Consumer | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1
Retail loans | Consumer | Interest Rate Reductions | Home equity
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1
Retail loans | Consumer | Interest Rate Reductions | Other consumer
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0
Retail loans | Consumer | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]
Retail loans | Consumer | AB Note Restructures | Home equity
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			0	[2]
Retail loans | Consumer | AB Note Restructures | Other consumer
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period			$ 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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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

New Accounting Pronouncements, Policy [Policy Text Block]

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 a $13 million increase to both "other noninterest income" and "provision for income taxes" for the three months ended March 31, 2013. The adoption of ASU 2014-01 had no effect on net income or earnings per common share for any period presented.

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Variable Interest Entities (VIEs) (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(in millions)	2014			2013
Other noninterest income:
Amortization of other tax credit investments	$	(2	)	$	(1	)
Provision for income taxes:
Amortization of LIHTC investments	14			13
Low income housing tax credits	(14		)	(14		)
Other tax benefits related to tax credit entities	(6		)	(5		)
Total provision for income taxes	$	(6	)	$	(6	)

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Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	$ 64		$ 62
Recorded investment in impaired loans with related allowance	189		212
Recorded investment total impaired loans	253		274
Unpaid principal balance	384		415
Related allowance for loan losses	39		57
Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	15		11
Recorded investment in impaired loans with related allowance	189		212
Recorded investment total impaired loans	204		223
Unpaid principal balance	321		344
Related allowance for loan losses	39		57
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	13		10
Recorded investment in impaired loans with related allowance	38		64
Recorded investment total impaired loans	51		74
Unpaid principal balance	95		121
Related allowance for loan losses	8		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	18		21
Recorded investment total impaired loans	18		21
Unpaid principal balance	22		25
Related allowance for loan losses	3		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	18	[1]	20	[1]
Recorded investment total impaired loans	18	[1]	20	[1]
Unpaid principal balance	21	[1]	24	[1]
Related allowance for loan losses	3	[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	0	[2]	1	[2]
Recorded investment total impaired loans	0	[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	1		1
Recorded investment in impaired loans with related allowance	133		123
Recorded investment total impaired loans	134		124
Unpaid principal balance	203		194
Related allowance for loan losses	28		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	65	[1]	60	[1]
Recorded investment total impaired loans	65	[1]	60	[1]
Unpaid principal balance	108	[1]	104	[1]
Related allowance for loan losses	13	[1]	12	[1]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	1	[2]	1	[2]
Recorded investment in impaired loans with related allowance	68	[2]	63	[2]
Recorded investment total impaired loans	69	[2]	64	[2]
Unpaid principal balance	95	[2]	90	[2]
Related allowance for loan losses	15	[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	49	[3]	51	[3]
Recorded investment in impaired loans with related allowance	0	[3]	0	[3]
Recorded investment total impaired loans	49	[3]	51	[3]
Unpaid principal balance	63	[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	32		35
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	32		35
Unpaid principal balance	38		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	17		16
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	17		16
Unpaid principal balance	25		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	13		12
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	13		12
Unpaid principal balance	19		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	6		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 (Summary Of Investment Securities Available-For-Sale In Unrealized Loss Positions) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Temporarily Impaired Less than 12 months, Fair Value	$ 4,797		$ 5,825
Temporarily Impaired Less than 12 months, Unrealized Losses	111		187
Temporarily Impaired 12 months or more, Fair Value	292		182
Temporarily Impaired 12 months or more, Unrealized Losses	11		12
Temporarily Impaired Total, Fair Value	5,089		6,007
Temporarily Impaired Total, Unrealized Losses	122		199
Residential Mortgage-Backed Securities
Temporarily Impaired Less than 12 months, Fair Value	4,797	[1]	5,825	[1]
Temporarily Impaired Less than 12 months, Unrealized Losses	111	[1]	187	[1]
Temporarily Impaired 12 months or more, Fair Value	138	[1]	11	[1]
Temporarily Impaired 12 months or more, Unrealized Losses	6	[1]	1	[1]
Temporarily Impaired Total, Fair Value	4,935	[1]	5,836	[1]
Temporarily Impaired Total, Unrealized Losses	117	[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	130	[2]	148	[2]
Temporarily Impaired 12 months or more, Unrealized Losses	4	[2]	9	[2]
Temporarily Impaired Total, Fair Value	130	[2]	148	[2]
Temporarily Impaired Total, Unrealized Losses	$ 4	[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	134				134
Other comprehensive income, net of tax	3			3
Cash dividends declared on common stock	(32)				(32)
Purchase of common stock	(74)					(74)
Purchase of common stock (in shares)		(2.2)
Net issuance of common stock under employee stock plans	5		(15)		(13)	33
Net issuance of common stock under employee stock plans (in shares)		0.7
Share-based compensation	10		10
BALANCE at Mar. 31, 2013	6,985	1,141	2,157	(410)	6,017	(1,920)
BALANCE (in shares) at Mar. 31, 2013		186.8
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	139				139
Other comprehensive income, net of tax	66			66
Cash dividends declared on common stock	(35)				(35)
Purchase of common stock	(80)					(80)
Purchase of common stock (in shares)		(1.7)
Net issuance of common stock under employee stock plans	29		(11)		(8)	48
Net issuance of common stock under employee stock plans (in shares)		1.1
Share-based compensation	14		14
BALANCE at Mar. 31, 2014	$ 7,283	$ 1,141	$ 2,182	$ (325)	$ 6,414	$ (2,129)
BALANCE (in shares) at Mar. 31, 2014		181.7

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Investment Securities

3 Months Ended

Mar. 31, 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
March 31, 2014
U.S. Treasury and other U.S. government agency securities	$	45	$	—	$	—	$	45
Residential mortgage-backed securities (a)	9,133		107		117		9,123
State and municipal securities	24		—		1		23
Corporate debt securities	54		—		—		54
Equity and other non-debt securities	245		1		4		242
Total investment securities available-for-sale (b)	$	9,501	$	108	$	122	$	9,487
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 $146 million and $142 million, respectively, as of March 31, 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 March 31, 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
March 31, 2014
Residential mortgage-backed securities (a)	$	4,797	$	111	$	138	$	6		$	4,935	$	117
State and municipal securities (b)	—		—		23		1			23		1
Corporate debt securities (b)	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities (b)	—		—		130		4			130		4
Total impaired securities	$	4,797	$	111	$	292	$	11		$	5,089	$	122
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 March 31, 2014, the Corporation had 169 securities in an unrealized loss position with no credit impairment, including 103 residential mortgage-backed securities, 48 equity and other non-debt auction-rate preferred securities, 17 state and municipal auction-rate securities, one corporate auction-rate debt security and one mutual fund. As of March 31, 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 March 31, 2014.

Sales, calls and write-downs of investment securities available-for-sale resulted in gains of $1 million and no losses for the three months ended March 31, 2014. No securities gains or losses were recognized for the three months ended March 31, 2013. Securities gains and losses are recorded in “net securities gains” on the consolidated statements of comprehensive income, computed based on the adjusted cost of the specific security.

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)
March 31, 2014	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	155	$	155
After one year through five years	268		269
After five years through ten years	277		287
After ten years	8,556		8,534
Subtotal	9,256		9,245
Equity and other non-debt securities	245		242
Total investment securities available-for-sale	$	9,501	$	9,487

Included in the contractual maturity distribution in the table above were auction-rate securities with a total amortized cost and fair value of $25 million and $24 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 March 31, 2014, investment securities with a carrying value of $3.3 billion were pledged where permitted or required by law to secure $2.3 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 Net Gains Recognized In Income On Customer-Initiated Derivatives) (Details) (Not Designated as Hedging Instrument [Member], Customer-Initiated And Other Activities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net derivative gain recognized in income	$ 13	$ 13
Interest Rate Contracts | Other Noninterest Income [Member]
Net derivative gain recognized in income	4	3
Energy Contracts | Other Noninterest Income [Member]
Net derivative gain recognized in income	0	1
Foreign Exchange Contracts | Foreign Exchange Income [Member]
Net derivative gain recognized in income	$ 9	$ 9

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Income Taxes And Tax-Related Items Income Taxes And Tax-Related Items (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 11	$ 11
Reasonably possible change in unrecognized tax benefits in next 12 months	7
Tax-related interest and penalties payable	2	2
Net deferred tax assets	224	256
Decrease in net deferred tax assets	32
Valuation allowance for deferred tax assets	$ 0	$ 0

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Medium- And Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Schedule Of Medium- And Long-Term Debt

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

(in millions)	March 31, 2014		December 31, 2013
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	315	$	318
Medium-term notes:
3.00% notes due 2015	299		299
Total parent company	614		617
Subsidiaries
Subordinated notes:
5.70% subordinated notes due 2014 (a)	252		255
5.75% subordinated notes due 2016 (a)	678		681
5.20% subordinated notes due 2017 (a)	561		566
8.375% subordinated notes due 2024 (callable at par in 2014)	183		183
7.875% subordinated notes due 2026 (a)	218		213
Total subordinated notes	1,892		1,898
Federal Home Loan Bank advance:
Floating-rate based on LIBOR indices due 2014	1,000		1,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	28		28
Total subsidiaries	2,920		2,926
Total medium- and long-term debt	$	3,534	$	3,543

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

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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	Mar. 31, 2014		Dec. 31, 2013
Cash and due from banks	$ 1,186		$ 1,140
Interest-bearing deposits with banks	4,434		5,311
Total loans, net of allowance for loan losses	45,895		44,872
Demand deposits (noninterest-bearing)	23,955		23,875
Customer certificates of deposit	5,099		5,063
Total deposits	53,750		53,292
Short-term borrowings	160		253
Medium- and long-term debt	3,534		3,543
Fair value assets measured on nonrecurring basis impaired loans	111		128
Fair value assets measured on nonrecurring basis nonmarketable equity securities	2		2
Carrying Amount [Member]
Cash and due from banks	1,186		1,140
Interest-bearing deposits with banks	4,434		5,311
Loans held-for-sale	2		4
Total loans, net of allowance for loan losses	45,895	[1]	44,872	[1]
Customers' liability on acceptances outstanding	12		11
Nonmarketable equity securities	12	[2]	12	[2]
Restricted equity investments	133		133
Demand deposits (noninterest-bearing)	23,955		23,875
Interest-bearing deposits	24,696		24,354
Customer certificates of deposit	5,099		5,063
Total deposits	53,750		53,292
Short-term borrowings	160		253
Acceptances outstanding	12		11
Medium- and long-term debt	3,534		3,543
Credit-related financial instruments	(91)		(88)
Estimated Fair Value [Member]
Cash and due from banks	1,186		1,140
Interest-bearing deposits with banks	4,434		5,311
Loans held-for-sale	2		4
Total loans, net of allowance for loan losses	45,932	[1]	44,801	[1]
Customers' liability on acceptances outstanding	12		11
Nonmarketable equity securities	19	[2]	19	[2]
Restricted equity investments	133		133
Demand deposits (noninterest-bearing)	23,955		23,875
Interest-bearing deposits	24,696		24,354
Customer certificates of deposit	5,090		5,055
Total deposits	53,741		53,284
Short-term borrowings	160		253
Acceptances outstanding	12		11
Medium- and long-term debt	3,527		3,540
Credit-related financial instruments	(91)		(88)
Level 1
Cash and due from banks	1,186		1,140
Interest-bearing deposits with banks	4,434		5,311
Loans held-for-sale	0		0
Total loans, net of allowance for loan losses	0	[1]	0	[1]
Customers' liability on acceptances outstanding	12		11
Nonmarketable equity securities	0	[2]	0	[2]
Restricted equity investments	133		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	160		253
Acceptances outstanding	12		11
Medium- and long-term debt	0		0
Credit-related financial instruments	0		0
Level 2
Cash and due from banks	0		0
Interest-bearing deposits with banks	0		0
Loans held-for-sale	2		4
Total loans, net of allowance for loan losses	0	[1]	0	[1]
Customers' liability on acceptances outstanding	0		0
Nonmarketable equity securities	0	[2]	0	[2]
Restricted equity investments	0		0
Demand deposits (noninterest-bearing)	23,955		23,875
Interest-bearing deposits	24,696		24,354
Customer certificates of deposit	5,090		5,055
Total deposits	53,741		53,284
Short-term borrowings	0		0
Acceptances outstanding	0		0
Medium- and long-term debt	3,527		3,540
Credit-related financial instruments	0		0
Level 3
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	45,932	[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)

[1] Included $111 million and $128 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2014 and December 31, 2013, respectively.

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

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Business Segment Information

3 Months Ended

Mar. 31, 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 March 31, 2014.

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
Three Months Ended March 31, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	371		$	146		$	46		$	(158	)	$	6		$	411
Provision for credit losses	16			2			(8		)	—			(1		)	9
Noninterest income	87			41			64			14			2			208
Noninterest expenses	146			171			78			3			8			406
Provision (benefit) for income taxes (FTE)	98			5			14			(55		)	3			65
Net income (loss)	$	198		$	9		$	26		$	(92	)	$	(2	)	$	139
Net credit-related charge-offs (recoveries)	$	11		$	4		$	(3	)	$	—		$	—		$	12
Selected average balances:
Assets	$	35,896		$	6,052		$	4,939		$	11,129		$	6,692		$	64,708
Loans	34,927			5,381			4,767			—			—			45,075
Deposits	27,023			21,361			3,816			353			217			52,770
Statistical data:
Return on average assets (a)	2.20		%	0.16		%	2.15		%	N/M			N/M			0.86		%
Efficiency ratio (b)	31.96			91.44			71.31			N/M			N/M			65.79

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Three Months Ended March 31, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	155		$	46		$	(167	)	$	7		$	416
Provision for credit losses	20			6			(6		)	—			(4		)	16
Noninterest income	90			41			65			14			3			213
Noninterest expenses	146			175			79			3			13			416
Provision (benefit) for income taxes (FTE)	101			5			13			(58		)	2			63
Net income (loss)	$	198		$	10		$	25		$	(98	)	$	(1	)	$	134
Net credit-related charge-offs	$	16		$	8		$	—		$	—		$	—		$	24
Selected average balances:
Assets	$	35,780		$	5,973		$	4,738		$	11,747		$	5,213		$	63,451
Loans	34,753			5,276			4,588			—			—			44,617
Deposits	25,514			21,049			3,682			275			172			50,692
Statistical data:
Return on average assets (a)	2.21		%	0.18		%	2.12		%	N/M			N/M			0.84		%
Efficiency ratio (b)	31.38			89.37			71.09			N/M			N/M			66.15

(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 March 31, 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
Three Months Ended March 31, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	183		$	172		$	136		$	72		$	(152	)	$	411
Provision for credit losses	3			11			6			(10		)	(1		)	9
Noninterest income	87			34			31			40			16			208
Noninterest expenses	161			96			90			48			11			406
Provision (benefit) for income taxes (FTE)	38			36			25			18			(52		)	65
Net income (loss)	$	68		$	63		$	46		$	56		$	(94	)	$	139
Net credit-related charge-offs (recoveries)	$	—		$	10		$	6		$	(4	)	$	—		$	12
Selected average balances:
Assets	$	13,819		$	15,133		$	11,070		$	6,865		$	17,821		$	64,708
Loans	13,473			14,824			10,364			6,414			—			45,075
Deposits	20,642			14,782			10,875			5,901			570			52,770
Statistical data:
Return on average assets (a)	1.26		%	1.59		%	1.50		%	3.28		%	N/M			0.86		%
Efficiency ratio (b)	59.71			46.72			53.83			43.39			N/M			65.79

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended March 31, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	190		$	171		$	134		$	81		$	(160	)	$	416
Provision for credit losses	(7		)	21			8			(2		)	(4		)	16
Noninterest income	92			35			31			38			17			213
Noninterest expenses	168			97			91			44			16			416
Provision (benefit) for income taxes (FTE)	43			32			23			21			(56		)	63
Net income (loss)	$	78		$	56		$	43		$	56		$	(99	)	$	134
Net credit-related charge-offs	$	5		$	10		$	6		$	3		$	—		$	24
Selected average balances:
Assets	$	14,042		$	13,795		$	10,795		$	7,859		$	16,960		$	63,451
Loans	13,650			13,542			10,071			7,354			—			44,617
Deposits	20,254			14,356			9,959			5,676			447			50,692
Statistical data:
Return on average assets (a)	1.47		%	1.45		%	1.54		%	2.86		%	N/M			0.84		%
Efficiency ratio (b)	59.53			47.04			54.99			37.41			N/M			66.15

(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