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, 2013

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, 2013: 186,643,937 shares

COMERICA INCORPORATED AND SUBSIDIARIES

TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION
ITEM 1. Financial Statements
Consolidated Balance Sheets at March 31, 2013 (unaudited) and December 31, 2012	1
Consolidated Statements of Comprehensive Income for the Three Months Ended March 31, 2013 and 2012 (unaudited)	2
Consolidated Statements of Changes in Shareholders’ Equity for the Three Months Ended March 31, 2013 and 2012 (unaudited)	3
Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2013 and 2012 (unaudited)	4
Notes to Consolidated Financial Statements (unaudited)	5
ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	37
ITEM 3. Quantitative and Qualitative Disclosures about Market Risk	64
ITEM 4. Controls and Procedures	64
PART II. OTHER INFORMATION
ITEM 1. Legal Proceedings	64
ITEM 1A. Risk Factors	64
ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds	64
ITEM 6. Exhibits	65
Signature	66

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements

CONSOLIDATED BALANCE SHEETS

Comerica Incorporated and Subsidiaries

(in millions, except share data)	March 31, 2013			December 31, 2012
	(unaudited)
ASSETS
Cash and due from banks	$	877		$	1,395
Federal funds sold	—			100
Interest-bearing deposits with banks	4,720			3,039
Other short-term investments	115			125
Investment securities available-for-sale	10,286			10,297
Commercial loans	28,508			29,513
Real estate construction loans	1,396			1,240
Commercial mortgage loans	9,317			9,472
Lease financing	853			859
International loans	1,269			1,293
Residential mortgage loans	1,568			1,527
Consumer loans	2,156			2,153
Total loans	45,067			46,057
Less allowance for loan losses	(617		)	(629		)
Net loans	44,450			45,428
Premises and equipment	618			622
Accrued income and other assets	3,819			4,063
Total assets	$	64,885		$	65,069
LIABILITIES AND SHAREHOLDERS’ EQUITY
Noninterest-bearing deposits	$	22,777		$	23,279
Money market and interest-bearing checking deposits	21,540			21,273
Savings deposits	1,652			1,606
Customer certificates of deposit	5,753			5,531
Foreign office time deposits	395			502
Total interest-bearing deposits	29,340			28,912
Total deposits	52,117			52,191
Short-term borrowings	58			110
Accrued expenses and other liabilities	1,023			1,106
Medium- and long-term debt	4,699			4,720
Total liabilities	57,897			58,127
Common stock - $5 par value:
Authorized - 325,000,000 shares
Issued - 228,164,824 shares	1,141			1,141
Capital surplus	2,157			2,162
Accumulated other comprehensive loss	(410		)	(413		)
Retained earnings	6,020			5,931
Less cost of common stock in treasury - 41,361,612 shares at 3/31/13 and 39,889,610 shares at 12/31/12	(1,920		)	(1,879		)
Total shareholders’ equity	6,988			6,942
Total liabilities and shareholders’ equity	$	64,885		$	65,069

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)	2013		2012
INTEREST INCOME
Interest and fees on loans	$	390	$	411
Interest on investment securities	53		63
Interest on short-term investments	3		3
Total interest income	446		477
INTEREST EXPENSE
Interest on deposits	15		19
Interest on medium- and long-term debt	15		16
Total interest expense	30		35
Net interest income	416		442
Provision for credit losses	16		22
Net interest income after provision for credit losses	400		420
NONINTEREST INCOME
Service charges on deposit accounts	55		56
Fiduciary income	43		38
Commercial lending fees	21		25
Letter of credit fees	16		17
Card fees	12		11
Foreign exchange income	9		10
Bank-owned life insurance	9		10
Brokerage fees	5		5
Net securities gains	—		5
Other noninterest income	30		29
Total noninterest income	200		206
NONINTEREST EXPENSES
Salaries	188		201
Employee benefits	63		59
Total salaries and employee benefits	251		260
Net occupancy expense	39		41
Equipment expense	15		17
Outside processing fee expense	28		26
Software expense	22		23
FDIC insurance expense	9		10
Advertising expense	6		7
Other real estate expense	1		4
Other noninterest expenses	45		60
Total noninterest expenses	416		448
Income before income taxes	184		178
Provision for income taxes	50		48
NET INCOME	134		130
Less income allocated to participating securities	2		1
Net income attributable to common shares	$	132	$	129
Earnings per common share:
Basic	$	0.71	$	0.66
Diluted	0.70		0.66
Comprehensive income	137		160
Cash dividends declared on common stock	32		20
Cash dividends declared per common share	0.17		0.10

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, 2011	197.3		$	1,141	$	2,170		$	(356	)	$	5,546		$	(1,633	)	$	6,868
Net income	—		—		—			—			130			—			130
Other comprehensive income, net of tax	—		—		—			30			—			—			30
Cash dividends declared on common stock ($0.10 per share)	—		—		—			—			(20		)	—			(20		)
Purchase of common stock	(1.2	)	—		—			—			—			(36		)	(36		)
Net issuance of common stock under employee stock plans	1.1		—		(32		)	—			(26		)	58			—
Share-based compensation	—		—		13			—			—			—			13
Other	(0.1	)	—		3			—			—			(3		)	—
BALANCE AT MARCH 31, 2012	197.1		$	1,141	$	2,154		$	(326	)	$	5,630		$	(1,614	)	$	6,985
BALANCE AT DECEMBER 31, 2012	188.3		$	1,141	$	2,162		$	(413	)	$	5,931		$	(1,879	)	$	6,942
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	)	$	6,020		$	(1,920	)	$	6,988

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)

Comerica Incorporated and Subsidiaries

	Three Months Ended March 31,
(in millions)	2013			2012
OPERATING ACTIVITIES
Net income	$	134		$	130
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	16			22
Provision for deferred income taxes	29			22
Depreciation and amortization	30			33
Net periodic defined benefit cost	21			19
Share-based compensation expense	10			13
Net amortization of securities	10			10
Accretion of loan purchase discount	(11		)	(25		)
Net securities gains	—			(5		)
Excess tax benefits from share-based compensation arrangements	(1		)	(1		)
Net change in:
Trading securities	10			(33		)
Accrued income receivable	(10		)	(1		)
Accrued expenses payable	(72		)	(85		)
Other, net	110			58
Net cash provided by operating activities	276			157
INVESTING ACTIVITIES
Investment securities available-for-sale:
Maturities and redemptions	938			937
Purchases	(955		)	(869		)
Net change in loans	971			(357		)
Other, net	(14		)	(14		)
Net cash provided by (used in) investing activities	940			(303		)
FINANCING ACTIVITIES
Net change in:
Deposits	—			600
Short-term borrowings	(52		)	12
Medium- and long-term debt:
Maturities and redemptions	—			(4		)
Common stock:
Repurchases	(74		)	(36		)
Cash dividends paid	(29		)	(20		)
Excess tax benefits from share-based compensation arrangements	1			1
Other, net	1			(4		)
Net cash (used in) provided by financing activities	(153		)	549
Net increase in cash and cash equivalents	1,063			403
Cash and cash equivalents at beginning of period	4,534			3,556
Cash and cash equivalents at end of period	$	5,597		$	3,959
Interest paid	$	29		$	32
Income taxes, tax deposits and tax-related interest paid	1			5
Noncash investing and financing activities:
Loans transferred to other real estate	5			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, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. 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, 2012.

Allowance for Loan Losses

The allowance for loan losses represents management’s assessment of probable, estimable losses inherent in the Corporation’s loan portfolio. The allowance for loan losses includes specific allowances, based on individual evaluations of certain loans, and allowances for homogeneous pools of loans with similar risk characteristics.

The allowance for business loans which do not meet the criteria to be evaluated individually is determined by applying standard reserve factors to the pool of business loans within each internal risk rating. In the first quarter 2013, the Corporation enhanced the approach utilized for determining standard reserve factors by changing from a dollar-based migration method for developing probability of default statistics to a count-based method. Under the dollar-based method, each dollar that moved to default received equal weight in the determination of standard reserve factors for each internal risk rating. As a result, the movement of larger loans impacted standard reserve factors more than the movement of smaller loans. By moving to a count-based approach, where each loan that moves to default receives equal weighting, unusually large or small loans will not have a disproportionate influence on the standard reserve factors. The change resulted in a $40 million increase to the allowance for loan losses at March 31, 2013.

Recently Adopted Accounting Pronouncements

In the first quarter 2013, the Corporation adopted amendments to GAAP which require enhanced disclosures about the nature and effect or potential effect of an entity's rights of setoff associated with its derivative and certain other financial instruments. The required disclosures are provided in Note 5 to these unaudited financial statements.

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

5

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 and investment securities, 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

Securities held for trading purposes 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 securities held for trading purposes 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. Securities classified as Level 3 include securities in less liquid markets and securities not rated by a credit agency. 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. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available or the market is deemed to be inactive at the measurement date, an adjustment to the quoted prices may be necessary. In some circumstances, the Corporation may conclude that a change in valuation technique or the use of multiple valuation techniques may be appropriate to estimate an instrument's fair value. 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.

6

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Securities classified as Level 3, of which the substantial majority is auction-rate securities, represent securities in less liquid markets requiring significant management assumptions when determining fair value. 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. Additionally, as the discount rate incorporates the liquidity risk premium, a change in an assumption used for the liquidity risk premium would be accompanied by a directionally similar change in the discount rate. The Corporate Development Department 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 not recorded at fair value. 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 for its over-the-counter derivative positions on a counterparty-by-counterparty basis and 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.

The Corporation holds a portfolio of warrants for generally nonmarketable equity securities with a fair value of $3 million at March 31, 2013. These warrants are primarily from high technology, non-public companies obtained as part of the loan origination

7

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

process. 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 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. 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 of $13 million at March 31, 2013. 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 17 years. The investments are accounted for 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 Corporation's percentage ownership in the net asset value of the entire fund, 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 $1 million and $2 million at March 31, 2013 and December 31, 2012, respectively.

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) 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 $89 million at both March 31, 2013 and December 31, 2012 and its investment in FRB stock totaled $85 million at both March 31, 2013 and December 31, 2012. 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

8

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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. Other real estate carried at fair value based on an observable market price or a current appraised value is classified by the Corporation as Level 2. 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.

Loan servicing rights

Loan servicing rights with a carrying value of $2 million at March 31, 2013, included in “accrued income and other assets” on the consolidated balance sheets and primarily related to Small Business Administration loans, are subject to impairment testing. Loan servicing rights may be carried at fair value on a nonrecurring basis when impairment testing indicates that the fair value of the loan servicing rights is less than the recorded value. A valuation model is used for impairment testing on a quarterly basis, which utilizes a discounted cash flow model, using interest rates and prepayment speed assumptions currently quoted for comparable instruments and a discount rate determined by management. On a quarterly basis, the Accounting Department is responsible for performing the valuation procedures and updating significant inputs, which are primarily obtained from available third-party market data, with appropriate oversight and approval provided by senior management. If the valuation model reflects a value less than the carrying value, loan servicing rights are adjusted to fair value through a valuation allowance as determined by the model. As such, the Corporation classifies loan servicing rights 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 standby and commercial 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, 2013 and 2012.

(in millions)	Total		Level 1		Level 2		Level 3
March 31, 2013
Trading securities:
Deferred compensation plan assets	$	91	$	91	$	—	$	—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	7		—		7		—
Corporate debt securities	3		—		3		—
Total trading securities	104		91		13		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	20		20		—		—
Residential mortgage-backed securities (a)	9,913		—		9,913		—
State and municipal securities (b)	23		—		—		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	56		—		56		—
Equity and other non-debt securities:
Auction-rate preferred securities	153		—		—		153
Money market and other mutual funds	120		120		—		—
Total investment securities available-for-sale	10,286		140		9,969		177
Derivative assets:
Interest rate contracts	512		—		512		—
Energy derivative contracts	142		—		142		—
Foreign exchange contracts	22		—		22		—
Warrants	3		—		—		3
Total derivative assets	679		—		676		3
Total assets at fair value	$	11,069	$	231	$	10,658	$	180
Derivative liabilities:
Interest rate contracts	$	196	$	—	$	196	$	—
Energy derivative contracts	140		—		140		—
Foreign exchange contracts	23		—		23		—
Other	1		—		—		1
Total derivative liabilities	360		—		359		1
Deferred compensation plan liabilities	91		91		—		—
Total liabilities at fair value	$	451	$	91	$	359	$	1

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

(b) Primarily 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, 2012
Trading securities:
Deferred compensation plan assets	$	88	$	88	$	—	$	—
Residential mortgage-backed securities (a)	4		—		4		—
State and municipal securities	19		—		19		—
Corporate debt securities	3		—		3		—
Total trading securities	114		88		26		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	20		20		—		—
Residential mortgage-backed securities (a)	9,935		—		9,935		—
State and municipal securities (b)	23		—		—		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	57		—		57		—
Equity and other non-debt securities:
Auction-rate preferred securities	156		—		—		156
Money market and other mutual funds	105		105		—		—
Total investment securities available-for-sale	10,297		125		9,992		180
Derivative assets:
Interest rate contracts	556		—		556		—
Energy derivative contracts	173		—		173		—
Foreign exchange contracts	21		—		21		—
Warrants	3		—		—		3
Total derivative assets	753		—		750		3
Total assets at fair value	$	11,164	$	213	$	10,768	$	183
Derivative liabilities:
Interest rate contracts	$	218	$	—	$	218	$	—
Energy derivative contracts	172		—		172		—
Foreign exchange contracts	18		—		18		—
Other	1		—		—		1
Total derivative liabilities	409		—		408		1
Deferred compensation plan liabilities	88		88		—		—
Total liabilities at fair value	$	497	$	88	$	408	$	1

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

(b) Primarily 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, 2013 and 2012.

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, 2013 and 2012.

			Net Realized/Unrealized Gains (Losses)
	Balance  at Beginning of Period		Recorded in Earnings					Recorded in Other Comprehensive Income (Pretax)										Balance  at End of  Period
(in millions)			Realized			Unrealized						Sales			Settlements
Three Months Ended March 31, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—	$	—			$	—		$	—		$	23
Auction-rate debt securities	1		—			—		—				—			—			1
Auction-rate preferred securities	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
Three Months Ended March 31, 2012
Investment securities available-for-sale:
State and municipal securities (a)	$	24	$	—		$	—	$	(1	)	(b)	$	—		$	—		$	23
Auction-rate debt securities	1		—			—		—				—			—			1
Auction-rate preferred securities	408		5		(c)	—		4			(b)	(97		)	—			320
Total investment securities available-for-sale	433		5		(c)	—		3			(b)	(97		)	—			344
Derivative assets:
Warrants	3		1		(d)	—		—				(1		)	—			3
Derivative liabilities:
Other	6		—			—		—				—			(6		)	—

(a) Primarily 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 (losses)" 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, 2013 and December 31, 2012 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012.

(in millions)	Level 3
March 31, 2013
Loans:
Commercial	$	56
Real estate construction	27
Commercial mortgage	122
Total loans	205
Nonmarketable equity securities	2
Other real estate	20
Loan servicing rights	2
Total assets at fair value	$	229
December 31, 2012
Loans:
Commercial	$	42
Real estate construction	25
Commercial mortgage	145
Lease financing	2
Total loans	214
Nonmarketable equity securities	2
Other real estate	24
Loan servicing rights	2
Total assets at fair value	$	242

The following table presents quantitative information related to the significant unobservable inputs utilized in the Corporation's significant Level 3 recurring fair value measurement as of March 31, 2013 and December 31, 2012. The Corporation's significant 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.

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
March 31, 2013
State and municipal securities (a)	$	23	6% - 10%	4 - 6
Equity and other non-debt securities:
Auction-rate preferred securities	153		4% - 6%	2 - 5
December 31, 2012
State and municipal securities (a)	$	23	6% - 10%	4 - 6
Equity and other non-debt securities:
Auction-rate preferred securities	156		4% - 6%	2 - 4

(a) Primarily auction-rate securities.

Level 3 assets recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012 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.

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, 2013
Assets
Cash and due from banks	$	877		$	877		$	877	$	—	$	—
Interest-bearing deposits with banks	4,720			4,720			4,720		—		—
Loans held-for-sale	12			12			—		12		—
Total loans, net of allowance for loan losses (a)	44,450			44,622			—		—		44,622
Customers’ liability on acceptances outstanding	13			13			13		—		—
Nonmarketable equity securities (b)	13			20			—		—		20
Restricted equity investments	174			174			174		—		—
Liabilities
Demand deposits (noninterest-bearing)	22,777			22,777			—		22,777		—
Interest-bearing deposits	23,587			23,587			—		23,587		—
Customer certificates of deposit	5,753			5,755			—		5,755		—
Total deposits	52,117			52,119			—		52,119		—
Short-term borrowings	58			58			58		—		—
Acceptances outstanding	13			13			13		—		—
Medium- and long-term debt	4,699			4,702			—		4,702		—
Credit-related financial instruments	(104		)	(104		)	—		—		(104		)
December 31, 2012
Assets
Cash and due from banks	$	1,395		$	1,395		$	1,395	$	—	$	—
Federal funds sold	100			100			100		—		—
Interest-bearing deposits with banks	3,039			3,039			3,039		—		—
Loans held-for-sale	12			12			—		12		—
Total loans, net of allowance for loan losses (a)	45,428			45,649			—		—		45,649
Customers’ liability on acceptances outstanding	18			18			18		—		—
Nonmarketable equity securities (b)	13			22			—		—		22
Restricted equity investments	174			174			174		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,279			23,279			—		23,279		—
Interest-bearing deposits	23,381			23,381			—		23,381		—
Customer certificates of deposit	5,531			5,535			—		5,535		—
Total deposits	52,191			52,195			—		52,195		—
Short-term borrowings	110			110			110		—		—
Acceptances outstanding	18			18			18		—		—
Medium- and long-term debt	4,720			4,685			—		4,685		—
Credit-related financial instruments	(103		)	(103		)	—		—		(103		)

(a) Included $205 million and $214 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012, respectively.

(b) Included $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at both March 31, 2013 and December 31, 2012.

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, 2013
U.S. Treasury and other U.S. government agency securities	$	20	$	—	$	—	$	20
Residential mortgage-backed securities (a)	9,684		230		1		9,913
State and municipal securities (b)	27		—		4		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	56		—		—		56
Equity and other non-debt securities:
Auction-rate preferred securities	159		—		6		153
Money market and other mutual funds	120		—		—		120
Total investment securities available-for-sale	$	10,067	$	230	$	11	$	10,286
December 31, 2012
U.S. Treasury and other U.S. government agency securities	$	20	$	—	$	—	$	20
Residential mortgage-backed securities (a)	9,687		248		—		9,935
State and municipal securities (b)	27		—		4		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	57		—		—		57
Equity and other non-debt securities:
Auction-rate preferred securities	163		—		7		156
Money market and other mutual funds	105		—		—		105
Total investment securities available-for-sale	$	10,060	$	248	$	11	$	10,297

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

(b) Primarily auction-rate securities.

A summary of the Corporation’s investment securities available-for-sale in an unrealized loss position as of March 31, 2013 and December 31, 2012 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, 2013
Residential mortgage-backed securities (a)	$	233	$	1	$	—	$	—		$	233	$	1
State and municipal securities (b)	—		—		23		4			23		4
Corporate debt securities:
Auction-rate debt securities	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities:
Auction-rate preferred securities	—		—		153		6			153		6
Total impaired securities	$	233	$	1	$	177	$	10		$	410	$	11
December 31, 2012
State and municipal securities (b)	$	—	$	—	$	23	$	4		$	23	$	4
Corporate debt securities:
Auction-rate debt securities	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities:
Auction-rate preferred securities	—		—		156		7			156		7
Total impaired securities	$	—	$	—	$	180	$	11		$	180	$	11

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

(b) Primarily auction-rate securities.

(c) Unrealized losses less than $0.5 million.

15

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

At March 31, 2013, the Corporation had 87 securities in an unrealized loss position with no credit impairment, including 50 auction-rate preferred securities, 22 state and municipal auction-rate securities, 14 residential mortgage-backed securities and one auction-rate debt security. As of March 31, 2013, approximately 85 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, 2013.

Sales, calls and write-downs of investment securities available-for-sale resulted in gains of $5 million and no losses for the three months ended March 31, 2012. 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, 2013	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	81	$	81
After one year through five years	419		425
After five years through ten years	114		113
After ten years	9,174		9,394
Subtotal	9,788		10,013
Equity and other nondebt securities:
Auction-rate preferred securities	159		153
Money market and other mutual funds	120		120
Total investment securities available-for-sale	$	10,067	$	10,286

Included in the contractual maturity distribution in the table above were auction-rate securities with a total amortized cost and fair value of $28 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 a total amortized cost and fair value of $9.7 billion and $9.9 billion, respectively. 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, 2013, investment securities with a carrying value of $3.0 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, 2013
Business loans:
Commercial	$	46	$	9	$	2	$	57	$	102	$	28,349	$	28,508
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		30		1,155		1,185
Other business lines (b)	—		—		—		—		3		208		211
Total real estate construction	—		—		—		—		33		1,363		1,396
Commercial mortgage:
Commercial Real Estate business line (a)	14		—		6		20		86		1,706		1,812
Other business lines (b)	64		2		9		75		178		7,252		7,505
Total commercial mortgage	78		2		15		95		264		8,958		9,317
Lease financing	—		—		—		—		—		853		853
International	1		—		—		1		—		1,268		1,269
Total business loans	125		11		17		153		399		40,791		41,343
Retail loans:
Residential mortgage	15		3		3		21		65		1,482		1,568
Consumer:
Home equity	4		3		—		7		28		1,463		1,498
Other consumer	7		1		5		13		2		643		658
Total consumer	11		4		5		20		30		2,106		2,156
Total retail loans	26		7		8		41		95		3,588		3,724
Total loans	$	151	$	18	$	25	$	194	$	494	$	44,379	$	45,067
December 31, 2012
Business loans:
Commercial	$	23	$	19	$	5	$	47	$	103	$	29,363	$	29,513
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		30		1,019		1,049
Other business lines (b)	—		—		—		—		3		188		191
Total real estate construction	—		—		—		—		33		1,207		1,240
Commercial mortgage:
Commercial Real Estate business line (a)	20		4		—		24		94		1,755		1,873
Other business lines (b)	27		9		8		44		181		7,374		7,599
Total commercial mortgage	47		13		8		68		275		9,129		9,472
Lease financing	—		—		—		—		3		856		859
International	4		—		3		7		—		1,286		1,293
Total business loans	74		32		16		122		414		41,841		42,377
Retail loans:
Residential mortgage	27		6		2		35		70		1,422		1,527
Consumer:
Home equity	9		3		—		12		31		1,494		1,537
Other consumer	4		3		5		12		4		600		616
Total consumer	13		6		5		24		35		2,094		2,153
Total retail loans	40		12		7		59		105		3,516		3,680
Total loans	$	114	$	44	$	23	$	181	$	519	$	45,357	$	46,057

(a) Primarily loans to real estate investors and developers.

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

(c) Included purchased credit-impaired (PCI) loans with a total carrying value of $29 million and $36 million at March 31, 2013 and December 31, 2012, respectively.

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, 2013
Business loans:
Commercial	$	26,875	$	881	$	650	$	102	$	28,508
Real estate construction:
Commercial Real Estate business line (e)	1,058		80		17		30		1,185
Other business lines (f)	198		2		8		3		211
Total real estate construction	1,256		82		25		33		1,396
Commercial mortgage:
Commercial Real Estate business line (e)	1,457		179		90		86		1,812
Other business lines (f)	6,741		232		354		178		7,505
Total commercial mortgage	8,198		411		444		264		9,317
Lease financing	843		8		2		—		853
International	1,220		48		1		—		1,269
Total business loans	38,392		1,430		1,122		399		41,343
Retail loans:
Residential mortgage	1,487		9		7		65		1,568
Consumer:
Home equity	1,457		7		6		28		1,498
Other consumer	622		23		11		2		658
Total consumer	2,079		30		17		30		2,156
Total retail loans	3,566		39		24		95		3,724
Total loans	$	41,958	$	1,469	$	1,146	$	494	$	45,067
December 31, 2012
Business loans:
Commercial	$	28,032	$	820	$	558	$	103	$	29,513
Real estate construction:
Commercial Real Estate business line (e)	921		77		21		30		1,049
Other business lines (f)	176		3		9		3		191
Total real estate construction	1,097		80		30		33		1,240
Commercial mortgage:
Commercial Real Estate business line (e)	1,479		213		87		94		1,873
Other business lines (f)	6,783		258		377		181		7,599
Total commercial mortgage	8,262		471		464		275		9,472
Lease financing	840		9		7		3		859
International	1,230		57		6		—		1,293
Total business loans	39,461		1,437		1,065		414		42,377
Retail loans:
Residential mortgage	1,438		12		7		70		1,527
Consumer:
Home equity	1,489		11		6		31		1,537
Other consumer	581		22		9		4		616
Total consumer	2,070		33		15		35		2,153
Total retail loans	3,508		45		22		105		3,680
Total loans	$	42,969	$	1,482	$	1,087	$	519	$	46,057

(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. Included in the special mention category were $210 million and $303 million at March 31, 2013 and December 31, 2012, respectively, of loans proactively monitored by management that were considered “pass” by regulatory authorities.

(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 - Summary of Significant Accounting Policies - on page F-59 in the Corporation's 2012 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 investors and 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, 2013		December 31, 2012
Nonaccrual loans	$	494	$	519
Reduced-rate loans (a)	21		22
Total nonperforming loans	515		541
Foreclosed property	40		54
Total nonperforming assets	$	555	$	595

(a) Reduced-rate business loans totaled $6 million at both March 31, 2013 and December 31, 2012, respectively, and reduced-rate retail loans totaled $15 million and $16 million, at March 31, 2013 and December 31, 2012, respectively.

Allowance for Credit Losses

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

	2013									2012
(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	$	552		$	77		$	629		$	648		$	78		$	726
Loan charge-offs	(34		)	(4		)	(38		)	(55		)	(7		)	(62		)
Recoveries on loans previously charged-off	12			2			14			14			3			17
Net loan charge-offs	(22		)	(2		)	(24		)	(41		)	(4		)	(45		)
Provision for loan losses	14			(2		)	12			25			(2		)	23
Balance at end of period	$	544		$	73		$	617		$	632		$	72		$	704
As a percentage of total loans	1.32		%	1.97		%	1.37		%	1.61		%	1.94		%	1.64		%
March 31
Allowance for loan losses:
Individually evaluated for impairment	$	60		$	—		$	60		$	143		$	1		$	144
Collectively evaluated for impairment	484			73			557			489			71			560
Total allowance for loan losses	$	544		$	73		$	617		$	632		$	72		$	704
Loans:
Individually evaluated for impairment	$	355		$	42		$	397		$	702		$	50		$	752
Collectively evaluated for impairment	40,964			3,677			44,641			38,523			3,665			42,188
PCI loans (a)	24			5			29			64			8			72
Total loans evaluated for impairment	$	41,343		$	3,724		$	45,067		$	39,289		$	3,723		$	43,012

(a)    No allowance for loan losses was required for PCI loans at March 31, 2013 and 2012.

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)	2013		2012
Balance at beginning of period	$	32	$	26
Provision for credit losses on lending-related commitments	4		(1		)
Balance at end of period	$	36	$	25

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, 2013
Business loans:
Commercial	$	11	$	98	$	109	$	201	$	22
Real estate construction:
Commercial Real Estate business line (a)	—		28		28		41		4
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		28		28		42		4
Commercial mortgage:
Commercial Real Estate business line (a)	4		89		93		151		12
Other business lines (b)	5		120		125		174		22
Total commercial mortgage	9		209		218		325		34
Lease financing	—		—		—		—		—
Total business loans	20		335		355		568		60
Retail loans:
Residential mortgage	34		—		34		40		—
Consumer:
Home equity	4		—		4		6		—
Other consumer	4		—		4		10		—
Total consumer	8		—		8		16		—
Total retail loans (c)	42		—		42		56		—
Total individually evaluated impaired loans	$	62	$	335	$	397	$	624	$	60
December 31, 2012
Business loans:
Commercial	$	2	$	117	$	119	$	207	$	26
Real estate construction:
Commercial Real Estate business line (a)	—		26		26		31		4
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		26		26		32		4
Commercial mortgage:
Commercial Real Estate business line (a)	—		99		99		159		18
Other business lines (b)	—		122		122		167		28
Total commercial mortgage	—		221		221		326		46
Lease financing	—		2		2		5		—
International	—		—		—		—		—
Total business loans	2		366		368		570		76
Retail loans:
Residential mortgage	39		—		39		48		—
Consumer:
Home equity	8		—		8		10		—
Other consumer	4		—		4		10		—
Total consumer	12		—		12		20		—
Total retail loans (c)	51		—		51		68		—
Total individually evaluated impaired loans	$	53	$	366	$	419	$	638	$	76

(a) Primarily loans to real estate investors and 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.

	2013				2012
(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	$	114	$	1	$	236	$	1
Real estate construction:
Commercial Real Estate business line (a)	27		—		85		—
Other business lines (b)	—		—		5		—
Total real estate construction	27		—		90		—
Commercial mortgage:
Commercial Real Estate business line (a)	96		—		163		—
Other business lines (b)	124		—		212		1
Total commercial mortgage	220		—		375		1
Lease financing	1		—		3		—
International	—		—		6		—
Total business loans	362		1		710		2
Retail loans:
Residential mortgage	37		—		44		—
Consumer:
Home equity	6		—		3		—
Other consumer	4		—		4		—
Total consumer	10		—		7		—
Total retail loans	47		—		51		—
Total individually evaluated impaired loans	$	409	$	1	$	761	$	2

(a) Primarily loans to real estate investors and 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, 2013 and 2012 of loans considered to be TDRs that were restructured during the three months ended March 31, 2013 and 2012, 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.

	2013							2012
	Type of Modification							Type of Modification
(in millions)	Principal Deferrals (a)			AB Note Restructures (b)		Total Modifications		Principal Deferrals (a)		AB Note Restructures (b)		Total Modifications
Three Months Ended March 31
Business loans:
Commercial	$	7		$	—	$	7	$	21	$	—	$	21
Commercial mortgage:
Commercial Real Estate business line (c)	16			—		16		24		6		30
Other business lines (d)	6			11		17		9		—		9
Total commercial mortgage	22			11		33		33		6		39
Total business loans	29			11		40		54		6		60
Retail loans:
Residential mortgage	1		(e)	—		1		—		—		—
Consumer:
Home equity	1		(e)	—		1		—		—		—
Other consumer	1		(e)	—		1		—		—		—
Total consumer	2			—		2		—		—		—
Total retail loans	3			—		3		—		—		—
Total loans	$	32		$	11	$	43	$	54	$	6	$	60

(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 investors and 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, 2013 and December 31, 2012, commitments to lend additional funds to borrowers whose terms have been modified in TDRs totaled $2 million and $5 million, respectively.

The majority of the modifications considered to be TDRs that occurred during the three months ended March 31, 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, 2013 and 2012 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, 2013 and 2012 of loans modified by principal deferral during the twelve months ended March 31, 2013 and 2012, and those principal deferrals which experienced a subsequent default during the three months ended March 31, 2013 and 2012. 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.

	2013					2012
(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	$	12		$	1	$	92	$	12
Real estate construction:
Commercial Real Estate business line (a)	1			—		—		—
Commercial mortgage:
Commercial Real Estate business line (a)	36			16		53		7
Other business lines (b)	17			4		39		8
Total commercial mortgage	53			20		92		15
Total business loans	66			21		184		27
Retail loans:
Residential mortgage	5		(c)	—		—		—
Consumer:
Home equity	4		(c)	—		—		—
Other consumer	2		(c)	—		3		—
Total consumer	6			—		3		—
Total retail loans	11			—		3		—
Total principal deferrals	$	77		$	21	$	187	$	27

(a) Primarily loans to real estate investors and 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.

The following table presents information regarding the recorded balance at March 31, 2013 and 2012 of loans modified by interest rate reduction during the twelve months ended March 31, 2013 and 2012, and those reduced-rate loans which experienced a subsequent default during the three months ended March 31, 2013 and 2012. For reduced-rate loans, a subsequent payment default is defined in terms of delinquency, when a principal or interest payment is 90 days past due.

	2013				2012
(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
Interest rate reductions:
Business loans:
Commercial	$	—	$	—	$	1	$	1
Real estate construction:
Commercial Real Estate business line (a)	—		—		1		—
Commercial mortgage:
Other business lines (b)	2		—		18		2
Lease financing	—		—		3		—
Total business loans	2		—		23		3
Retail loans:
Residential mortgage	1		—		9		1
Consumer:
Other consumer	1		—		—		—
Total retail loans	2		—		9		1
Total interest rate reductions	$	4	$	—	$	32	$	4

(a) Primarily loans to real estate investors and developers.

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

23

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

During the twelve months ended March 31, 2013 and 2012 loans with a carrying value of $30 million and $33 million at March 31, 2013 and 2012, respectively, were restructured into two notes (AB note restructures). For 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 AB note restructures during both the three-month periods ended March 31, 2013 and 2012.

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.

The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at March 31, 2013 and December 31, 2012 were as follows. The outstanding balance represents the total amount owed as of March 31, 2013 and December 31, 2012, including accrued but unpaid interest and any amounts previously charged off. No allowance for loan losses was required on the acquired PCI loan pools at both March 31, 2013 and December 31, 2012.

(in millions)	March 31, 2013		December 31, 2012
Acquired PCI loans:
Carrying amount	$	29	$	36
Outstanding balance	125		138

Changes in the accretable yield for acquired PCI loans for the three months ended March 31, 2013 and 2012 were as follows.

	Three Months Ended March 31,
(in millions)	2013			2012
Balance at beginning of period	$	16		$	25
Accretion	(4		)	(5		)
Balance at end of period	$	12		$	20

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. The Corporation presents derivative instruments at fair value in the consolidated balance sheets on a net basis when a right of offset exists, based on transactions with a single counterparty and any cash collateral paid to and/or received from that counterparty for derivative contracts that are subject to legally enforceable master netting arrangements. 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. For derivatives 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

24

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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, 2013, counterparties with bilateral collateral agreements had pledged $75 million of marketable investment securities and deposited $83 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had pledged $45 million of investment securities and posted $3 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, 2013 was $48 million, for which the Corporation had pledged collateral of $33 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, 2013, the Corporation would have been required to assign an additional $15 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.

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, 2013 and December 31, 2012. 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, 2013								December 31, 2012
			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	$	272		$	—		$	1,450	$	290		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	455		1			1			475		1			—
Total risk management purposes	1,905		273			1			1,925		291			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	564		—			3			545		—			3
Caps and floors purchased	564		3			—			545		3			—
Swaps	11,061		237			193			10,952		263			215
Total interest rate contracts	12,189		240			196			12,042		266			218
Energy contracts:
Caps and floors written	1,875		—			85			1,873		—			112
Caps and floors purchased	1,875		85			—			1,873		112			—
Swaps	2,441		57			55			1,815		61			60
Total energy contracts	6,191		142			140			5,561		173			172
Foreign exchange contracts:
Spot, forwards, options and swaps	2,012		21			22			2,253		20			18
Total customer-initiated and other activities	20,392		403			358			19,856		459			408
Total gross derivatives	$	22,297	676			359			$	21,781	750			408
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(252		)	(252		)			(279		)	(279		)
Netting adjustment - Cash collateral received/posted			(82		)	(2		)			(11		)	—
Net derivatives included in the consolidated balance sheets (b)			342			105					460			129
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(74		)	(45		)			(180		)	(56		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	268		$	60				$	280		$	73

(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 $5 million and $4 million at March 31, 2013 and December 31, 2012, respectively.

26

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 and $17 million for the three months ended March 31, 2013 and 2012, respectively. 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, 2013 and 2012.

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-month periods ended March 31, 2013 and 2012.

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, 2013 and December 31, 2012.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
March 31, 2013
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,450	4.2	5.45	%	0.51	%
December 31, 2012
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,450		4.4	5.45		0.62

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at March 31, 2013 and December 31, 2012.

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, 2013 and 2012.

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	2013		2012
Interest rate contracts	Other noninterest income	$	3	$	2
Energy contracts	Other noninterest income	1		1
Foreign exchange contracts	Foreign exchange income	9		9
Total		$	13	$	12

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, 2013		December 31, 2012
Unused commitments to extend credit:
Commercial and other	$	26,683	$	25,659
Bankcard, revolving check credit and home equity loan commitments	1,687		1,681
Total unused commitments to extend credit	$	28,370	$	27,340
Standby letters of credit	$	4,908	$	4,985
Commercial letters of credit	60		78
Other credit-related financial instruments	1		1

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, 2013 and December 31, 2012, the allowance for credit losses on lending-related commitments, included in “accrued expenses and other liabilities” on the consolidated balance sheets, was $36 million and $32 million, respectively. The Corporation recorded a purchase discount for acquired lending-related commitments. An allowance for credit losses will be recorded on acquired lending-related commitments only to the extent that the required allowance exceeds the remaining purchase discount. At both March 31, 2013 and December 31, 2012, no allowance was recorded for acquired lending-related commitments and $2 million of purchase discount remained.

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 $20 million and $19 million at March 31, 2013 and December 31, 2012, respectively, for probable credit losses inherent in the Corporation’s unused commitments to extend credit.

Standby and Commercial Letters of Credit

Standby letters of credit represent conditional obligations of the Corporation which guarantee the performance of a customer to a third party. Standby letters of credit are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing and similar transactions. Commercial letters of credit are issued to finance foreign or domestic trade transactions. These contracts expire in decreasing amounts through the year 2022. The Corporation may enter into participation arrangements with third parties that effectively reduce the maximum amount of future payments which may be required under standby and commercial letters of credit. These risk participations covered $319 million and $325 million, respectively, of the $5.0 billion and $5.1 billion standby and commercial letters of credit outstanding at March 31, 2013 and December 31, 2012, 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 $82 million at March 31, 2013, including $66 million in deferred fees and $16 million in the allowance for credit losses on lending-related commitments. At December 31, 2012, the comparable amounts were $82 million, $69 million and $13 million, respectively.

28

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table presents a summary of internally classified watch list standby and commercial letters of credit at March 31, 2013 and December 31, 2012. The Corporation's internal watch 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, 2013			December 31, 2012
Total watch list standby and commercial letters of credit	$	142		$	144
As a percentage of total outstanding standby and commercial letters of credit	2.9		%	2.9		%

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, 2013 and December 31, 2012, the total notional amount of the credit risk participation agreements was approximately $594 million and $574 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 $10 million and $11 million at March 31, 2013 and December 31, 2012, 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, 2013, the weighted average remaining maturity of outstanding credit risk participation agreements was 2.7 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 $1 million at both March 31, 2013 and December 31, 2012, respectively.

NOTE 6 - VARIABLE INTEREST ENTITIES (VIEs)

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

The Corporation holds ownership interests in funds in the form of limited partnerships or limited liability companies (LLCs) investing in low income housing projects. The Corporation also directly invests in limited partnerships and LLCs which invest in community development projects which generate similar tax credits to investors. 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 interest in these entities on either the cost or equity method. Exposure to loss as a result of the Corporation’s involvement with these entities at March 31, 2013 was limited to approximately $371 million, which reflected the carrying value of the Corporation's investment and unfunded commitments for future investments.

As an investor, the Corporation obtains income tax credits and deductions from the operating losses of these tax credit entities. The income tax credits and deductions are allocated to the investors based on their ownership percentages and are recorded as a reduction of income tax expense (or an increase to income tax benefit) and a reduction of federal income taxes payable. Investment balances, including all legally binding commitments to fund future investments, are included in “accrued income and other assets” on the consolidated balance sheets, with amortization and other write-downs of investments recorded in “other

29

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

noninterest income” on the consolidated statements of comprehensive income. In addition, 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 ($121 million at March 31, 2013).

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, 2013 and 2012.

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

	Three Months Ended March 31,
(in millions)	2013			2012
Other noninterest income	$	(14	)	$	(14	)
Benefit for income taxes (a)	(14		)	(14		)

(a) Income tax credits from low income housing tax credit/historic rehabilitation tax credit partnerships.

For further information on the Corporation’s consolidation policy, see Note 1 to the consolidated financial statements in the Corporation's 2012 Annual Report.

NOTE 7 - MEDIUM- AND LONG-TERM DEBT

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

(in millions)	March 31, 2013		December 31, 2012
Parent company
Subordinated notes:
4.80% subordinated notes due 2015	$	327	$	330
Medium-term notes:
3.00% notes due 2015	299		299
Total parent company	626		629
Subsidiaries
Subordinated notes:
7.375% subordinated notes due 2013	50		51
5.70% subordinated notes due 2014	264		267
5.75% subordinated notes due 2016	691		694
5.20% subordinated notes due 2017	587		593
Floating-rate based on LIBOR index subordinated notes due 2018	26		26
8.375% subordinated notes due 2024	186		186
7.875% subordinated notes due 2026	236		241
Total subordinated notes	2,040		2,058
Federal Home Loan Bank advances:
Floating-rate based on LIBOR indices due 2013 to 2014	2,000		2,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	33		33
Total subsidiaries	4,073		4,091
Total medium- and long-term debt	$	4,699	$	4,720

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

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

Comerica Bank (the Bank) is a member of the FHLB, which provides short- and long-term funding 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, 2013.

30

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

NOTE 8 - ACCUMULATED OTHER COMPREHENSIVE INCOME (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, 2013 and 2012, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Three Months Ended March 31,
(in millions)	2013			2012
Accumulated net unrealized gains on investment securities available-for-sale:
Balance at beginning of period, net of tax	$	150		$	129
Net unrealized holding gains (losses) arising during the period	(18		)	35
Less: Provision (benefit) for income taxes	(7		)	13
Net unrealized holding gains (losses) arising during the period, net of tax	(11		)	22
Less:
Net realized gains included in net securities gains	—			5
Less: Provision for income taxes	—			2
Reclassification adjustment for net securities gains included in net income, net of tax	—			3
Change in net unrealized gains on investment securities available-for-sale, net of tax	(11		)	19
Balance at end of period, net of tax	$	139		$	148
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(563	)	$	(485	)
Net defined benefit pension and other postretirement adjustment arising during the period, net of tax	—			—
Less:
Amortization of actuarial net loss	(21		)	(15		)
Amortization of prior service cost	(1		)	(1		)
Amortization of transition obligation	—			(1		)
Amounts recognized in employee benefits expense	(22		)	(17		)
Less: Benefit for income taxes	(8		)	(6		)
Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax	(14		)	(11		)
Change in defined benefit pension and other postretirement plans adjustment, net of tax	14			11
Balance at end of period, net of tax	$	(549	)	$	(474	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(410	)	$	(326	)

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)	2013		2012
Basic and diluted
Net income	$	134	$	130
Less:
Income allocated to participating securities	2		1
Net income attributable to common shares	$	132	$	129
Basic average common shares	185		195
Basic net income per common share	$	0.71	$	0.66
Basic average common shares	185		195
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	—		1
Net effect of the assumed exercise of warrants	2		—
Diluted average common shares	187		196
Diluted net income per common share	$	0.70	$	0.66

31

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following average shares related to outstanding options and warrants 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 and warrants were greater than the average market price of common shares for the period.

	Three Months Ended March 31,
(shares in millions)	2013	2012
Average outstanding options	15.1	17.6
Range of exercise prices	$34.78 - $61.94	$30.77 - $64.50
Average outstanding warrants		0.6
Exercise price		$30.36

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)	2013			2012
Service cost	$	9		$	8
Interest cost	19			19
Expected return on plan assets	(33		)	(28		)
Amortization of prior service cost	1			1
Amortization of net loss	19			13
Net periodic defined benefit cost	$	15		$	13

Non-Qualified Defined Benefit Pension Plan	Three Months Ended March 31,
(in millions)	2013		2012
Service cost	$	1	$	1
Interest cost	3		2
Amortization of net loss	2		2
Net periodic defined benefit cost	$	6	$	5

Postretirement Benefit Plan	Three Months Ended March 31,
(in millions)	2013			2012
Interest cost	$	1		$	1
Expected return on plan assets	(1		)	(1		)
Amortization of transition obligation	—			1
Net periodic postretirement benefit cost	$	—		$	1

For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2012 Annual Report.

NOTE 11 - INCOME TAXES AND TAX-RELATED ITEMS

At March 31, 2013, net unrecognized tax benefits were $42 million, compared to $21 million at March 31, 2012. The increase in unrecognized tax benefits of $21 million was primarily the result of the recognition of various federal and state settlements. The Corporation anticipates that it is reasonably possible that final settlement of federal and state tax issues will result in a decrease of net unrecognized tax benefits of $30 million within the next twelve months. Included in "accrued expense and other liabilities" on the consolidated balance sheets was a $4 million liability for tax-related interest and penalties at March 31, 2013, compared to a $7 million receivable at March 31, 2012. The $11 million increase in accrued interest and penalties payable from March 31, 2012 to March 31, 2013 was primarily a result of actual and anticipated settlements with tax authorities.

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.

32

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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

The Corporation and certain of its subsidiaries are subject to various 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 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. Litigation-related expense of $3 million and $11 million and legal fees of $8 million and $9 million were included in “other noninterest expenses” on the consolidated statements of comprehensive income for the three months ended March 31, 2013 and 2012, respectively. 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.

For other matters, where a loss is not probable, the Corporation has not established legal reserves. In determining whether it is possible to provide an estimate of loss or range of possible loss, the Corporation reviews and evaluates its material litigation on an ongoing basis, in conjunction with legal counsel, in light of potentially relevant factual and legal developments. Based on current knowledge, expectation of future earnings, and after consultation with legal counsel, management believes the maximum amount of reasonably possible losses would not have a material adverse effect on the Corporation's consolidated financial condition, consolidated results of operations or consolidated cash flows.

 The damages alleged by plaintiffs or claimants may be overstated, unsubstantiated by legal theory, unsupported by the facts, and/or bear no relation to the ultimate award that a court, jury or agency might impose. In view of the inherent difficulty of predicting the outcome of such matters, the Corporation cannot state with confidence a range of reasonably possible losses, nor what the eventual outcome of these matters will be. However, based on current knowledge and after consultation with legal counsel, management believes the maximum amount of reasonably possible losses would not have a material adverse effect on the Corporation’s consolidated financial condition, consolidated results of operations or consolidated cash flows.

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.

In the first quarter 2013, the Corporation changed the method of assigning the allowance for loan losses to each business segment. In 2012, national probability of default and loss given default statistics were incorporated into the Corporation's allowance methodology. Each business segment was assigned an allowance for loan losses based on market-specific standard reserve factors

33

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

applied to the loans in each segment, and the difference between the total allowance required on a national basis and the market-specific allowances was allocated based on the relative loan balances in each segment. Effective first quarter 2013, each segment is assigned an allowance for loan losses by applying national standard reserve factors to the loan balances in each segment by risk rating distribution. For comparability purposes, amounts in all periods are based on business segments and methodologies in effect at March 31, 2013.

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 2012 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, 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	77			41			65			14			3			200
Noninterest expenses	146			175			79			3			13			416
Provision (benefit) for income taxes (FTE)	88			5			13			(58		)	2			50
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)	2.19		%	0.18		%	2.12		%	N/M			N/M			0.84		%
Efficiency ratio (b)	32.30			89.37			71.09			N/M			N/M			67.58

(Table continues on following page).

34

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, 2012
Earnings summary:
Net interest income (expense) (FTE)	$	373		$	167		$	47		$	(152	)	$	8		$	443
Provision for credit losses	2			6			12			—			2			22
Noninterest income	81			42			65			13			5			206
Noninterest expenses	158			183			80			3			24			448
Provision (benefit) for income taxes (FTE)	91			7			7			(54		)	(2		)	49
Net income (loss)	$	203		$	13		$	13		$	(88	)	$	(11	)	$	130
Net credit-related charge-offs	$	28		$	12		$	5		$	—		$	—		$	45
Selected average balances:
Assets	$	33,178		$	6,173		$	4,636		$	11,827		$	5,531		$	61,345
Loans	32,238			5,462			4,569			—			—			42,269
Deposits	23,997			20,373			3,611			161			169			48,311
Statistical data:
Return on average assets (a)	2.45		%	0.25		%	1.07		%	N/M			N/M			0.85		%
Efficiency ratio (b)	34.86			87.54			75.00			N/M			N/M			69.70

(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, 2013.

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, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	189		$	171		$	135		$	81		$	(160	)	$	416
Provision for credit losses	(8		)	21			8			(1		)	(4		)	16
Noninterest income	92			35			31			25			17			200
Noninterest expenses	168			97			91			44			16			416
Provision (benefit) for income taxes (FTE)	44			32			23			7			(56		)	50
Net income (loss)	$	77		$	56		$	44		$	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	20,255			14,356			9,959			5,675			447			50,692
Statistical data:
Return on average assets (a)	1.45		%	1.45		%	1.53		%	2.85		%	N/M			0.84		%
Efficiency ratio (b)	59.53			47.04			54.99			42.11			N/M			67.58

(Table continues on following page).

35

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, 2012
Earnings summary:
Net interest income (expense) (FTE)	$	196		$	165		$	150		$	76		$	(144	)	$	443
Provision for credit losses	(3		)	(3		)	25			1			2			22
Noninterest income	98			33			31			26			18			206
Noninterest expenses	179			99			93			50			27			448
Provision (benefit) for income taxes (FTE)	40			38			22			5			(56		)	49
Net income (loss)	$	78		$	64		$	41		$	46		$	(99	)	$	130
Net credit-related charge-offs	$	18		$	11		$	7		$	9		$	—		$	45
Selected average balances:
Assets	$	14,092		$	12,310		$	10,080		$	7,505		$	17,358		$	61,345
Loans	13,829			12,096			9,295			7,049			—			42,269
Deposits	19,415			13,688			10,229			4,649			330			48,311
Statistical data:
Return on average assets (a)	1.53		%	1.74		%	1.43		%	2.43		%	N/M			0.85		%
Efficiency ratio (b)	60.88			50.50			51.10			51.93			N/M			69.70

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

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

FTE – Fully Taxable Equivalent

N/M – not meaningful

36

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

FORWARD-LOOKING STATEMENTS

This report includes forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. In addition, the Corporation may make other written and oral communications from time to time that contain such statements. All statements regarding the Corporation's expected financial position, strategies and growth prospects and general economic conditions expected to exist in the future are forward-looking statements. The words, "anticipates," "believes," "contemplates," "feels," "expects," "estimates," "seeks," "strives," "plans," "intends," "outlook," "forecast," "position," "target," "mission," "assume," "achievable," "potential," "strategy," "goal," "aspiration," "opportunity," "initiative," "outcome," "continue," "remain," "maintain," "on course," "trend," "objective," "looks forward" 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, Comerica'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 the interest rate policies of the Federal Reserve Board; 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; any future acquisitions or divestitures; the effects of more stringent capital or liquidity requirements; declines or other changes in the businesses or industries of the Corporation's customers; the implementation of the Corporation's strategies and business models; the Corporation's ability to utilize technology to efficiently and effectively develop, market and deliver new products and services; operational difficulties, failure of technology infrastructure or information security incidents; 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; 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, droughts 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 13 of the Corporation's Annual Report on Form 10-K for the year ended December 31, 2012. Forward-looking statements speak only as of the date they are made. The Corporation does not undertake to update forward-looking statements to reflect facts, circumstances, assumptions or events that occur after the date the forward-looking statements are made. For any forward-looking statements made in this report or in any documents, the Corporation claims the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995.

37

RESULTS OF OPERATIONS

Net income for the three months ended March 31, 2013 was $134 million, an increase of $4 million from $130 million for the three months ended March 31, 2012. The increase in net income in the three months ended March 31, 2013, compared to the same period in 2012, reflected decreases of $6 million in the provision for credit losses and $32 million in noninterest expenses, partially offset by decreases of $26 million in net interest income and $6 million in noninterest income and an increase of $2 million in the provision for income taxes. Net income per diluted common share was $0.70 for the three months ended March 31, 2013, compared to $0.66 for the same period one year ago.

Full-Year 2013 Outlook Compared to Full-Year 2012

For full-year 2013, management expects the following compared to 2012, assuming a continuation of the current slow growing economic environment:

• Continued growth in average loans at a slower pace, with economic uncertainty impacting demand and a continued focus on maintaining pricing and structure discipline in a competitive environment.

• Lower net interest income, reflecting both a decline of $40 million to $50 million in purchase accounting accretion and the effect of continued low rates. Loan growth should partially offset the impact of low rates on loans and securities.

• Provision for credit losses stable, reflecting loan growth offset by a decline in nonperforming loans and net charge-offs.

• Customer-driven noninterest income relatively stable, reflecting cross-sell initiatives and selective pricing adjustments partially offset by regulatory pressures on certain products, such as customer derivatives. Outlook does not include expectations for non-customer driven income.

• Lower noninterest expense, reflecting further cost savings due to tight expense control and no restructuring expenses.

• Effective tax rate of approximately 27.5 percent.

Net Interest Income

Net interest income was $416 million for the three months ended March 31, 2013, a decrease of $26 million compared to $442 million for the same period in 2012. The decrease in net interest income in the three months ended March 31, 2013, compared to the same period in 2012, resulted primarily from a decrease in yields, a $14 million decrease in the accretion of the purchase discount on the acquired loan portfolio and one less day in the first quarter 2013, partially offset by an increase in average earning assets. Average earning assets increased $2.4 billion, or 4 percent, to $58.6 billion for the three months ended March 31, 2013, compared $56.2 billion for the same period in 2012. The increase in average earning assets primarily reflected increases of $2.3 billion in average loans and $132 million in average investment securities available-for-sale. The net interest margin (FTE) for the three months ended March 31, 2013 decreased 31 basis points to 2.88 percent, from 3.19 percent for the comparable period in 2012, primarily from decreased yields on loans and mortgage-backed investment securities and a decrease in accretion of the purchase discount on the acquired loan portfolio, partially offset by lower deposit rates. The decrease in loan yields reflected a shift in the average loan portfolio mix, largely due to an increase in lower-yielding average commercial loans as well as decreases in higher-yielding commercial mortgage and real estate construction loans, lower LIBOR rates and positive credit quality migration throughout the portfolio. Yields on mortgage-backed investment securities decreased as a result of prepayments on higher-yielding securities and new investments in lower-yielding securities impacted by the lower rate environment. Accretion of the purchase discount on the acquired loan portfolio increased the net interest margin by 8 basis points in the three months ended March 31, 2013, compared to 18 basis points in the same period in 2012, and excess liquidity reduced the net interest margin by approximately 17 basis points in the three months ended March 31, 2013, compared to 21 basis points in the same period in 2012. Excess liquidity was represented by $3.7 billion and $3.8 billion of average balances deposited with the Federal Reserve Bank (FRB) in first three months of 2013 and 2012, 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 that follows provides an analysis of net interest income (FTE) for the three months ended March 31, 2013 and 2012 and details the components of the change in net interest income on a FTE basis for the three months ended March 31, 2013 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.

38

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

	Three Months Ended
	March 31, 2013							March 31, 2012
(dollar amounts in millions)	Average Balance			Interest		Average Rate		Average Balance			Interest		Average Rate
Commercial loans	$	28,056		$	229	3.31	%	$	24,736		$	219	3.56	%
Real estate construction loans	1,314			13		4.15		1,453			17		4.58
Commercial mortgage loans	9,398			95		4.08		10,202			119		4.73
Lease financing	857			7		3.23		897			8		3.41
International loans	1,282			11		3.62		1,205			11		3.76
Residential mortgage loans	1,556			17		4.39		1,519			18		4.77
Consumer loans	2,154			18		3.36		2,257			20		3.49
Total loans (a)	44,617			390		3.54		42,269			412		3.92
Auction-rate securities available-for-sale	176			—		0.31		352			—		0.63
Other investment securities available-for-sale	9,845			53		2.21		9,537			63		2.73
Total investment securities available-for-sale	10,021			53		2.17		9,889			63		2.65
Interest-bearing deposits with banks (b)	3,852			2		0.27		3,892			2		0.26
Other short-term investments	117			1		2.30		135			1		1.97
Total earning assets	58,607			446		3.09		56,185			478		3.44
Cash and due from banks	979							999
Allowance for loan losses	(633		)					(737		)
Accrued income and other assets	4,498							4,898
Total assets	$	63,451						$	61,345
Money market and interest-bearing checking deposits	$	21,294		7		0.14		$	20,795		10		0.19
Savings deposits	1,623			—		0.03		1,543			—		0.08
Customer certificates of deposit	5,744			7		0.47		5,978			8		0.57
Foreign office time deposits	525			1		0.55		358			1		0.57
Total interest-bearing deposits	29,186			15		0.21		28,674			19		0.26
Short-term borrowings	123			—		0.11		78			—		0.11
Medium- and long-term debt	4,707			15		1.32		4,940			16		1.34
Total interest-bearing sources	34,016			30		0.36		33,692			35		0.42
Noninterest-bearing deposits	21,506							19,637
Accrued expenses and other liabilities	973							1,077
Total shareholders’ equity	6,956							6,939
Total liabilities and shareholders’ equity	$	63,451						$	61,345
Net interest income/rate spread (FTE)				$	416	2.73					$	443	3.02
FTE adjustment				$	—						$	1
Impact of net noninterest-bearing sources of funds						0.15							0.17
Net interest margin (as a percentage of average earning assets) (FTE) (a) (b)						2.88	%						3.19	%

(a) Accretion of the purchase discount on the acquired loan portfolio of $11 million and $25 million increased the net interest margin by 8 basis points and 18 basis points in the three months ended March 31, 2013 and 2012, respectively.

(b) Excess liquidity, represented by average balances deposited with the Federal Reserve Bank, reduced the net interest margin by 17 basis points and 21 basis points in the three months ended March 31, 2013 and 2012, respectively.

39

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

	Three Months Ended
	March 31, 2013/March 31, 2012
(in millions)	Increase (Decrease) Due to Rate				Increase (Decrease) Due to  Volume (a)			Net Increase (Decrease)
Interest Income (FTE):
Loans	$	(39	)	(b)	$	17		$	(22	)	(b)
Investment securities available-for-sale	(12		)		2			(10		)
Total interest income (FTE)	(51		)		19			(32		)
Interest Expense:
Interest-bearing deposits	(4		)		—			(4		)
Medium- and long-term debt	—				(1		)	(1		)
Total interest expense	(4		)		(1		)	(5		)
Net interest income (FTE)	$	(47	)		$	20		$	(27	)

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

(b) Reflected a decrease of $14 million in accretion of the purchase discount on the acquired loan portfolio.

Provision for Credit Losses

The provision for credit losses was $16 million for the three months ended March 31, 2013, compared to $22 million for the same period in 2012. 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 discussion of 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 $12 million for the three months ended March 31, 2013, compared to $23 million for the three months ended March 31, 2012. The decrease of $11 million in the provision for loan losses in the three months ended March 31, 2013, compared to the same period in 2012, resulted primarily from continued improvements in credit quality in the loan portfolio, in part reflecting improvements in the U.S. economy. Improvements in credit quality included a decline of $1.1 billion in the Corporation's internal watch list loans from March 31, 2012 to March 31, 2013. Reflected in the decline in watch list loans was a decrease in nonaccrual loans of $336 million. The Corporation's internal watch list is generally consistent with loans in the Special Mention, Substandard and Doubtful categories defined by regulatory authorities.

Net loan charge-offs in the first three months of 2013 decreased $21 million to $24 million, or 0.21 percent of average total loans, compared to $45 million, or 0.43 percent, for the first three months of 2012. The $21 million decrease in net loan charge-offs in the first three months of 2013, compared to the same period in 2012, primarily reflected decreases in Commercial Real Estate ($15 million) and Private Banking ($6 million). Net loan charge-offs decreased in all geographic markets in the first three months of 2013, compared to the same period in 2012.

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 increased $5 million to a provision of $4 million in the three months ended March 31, 2013, compared to a benefit of $1 million for the same period in 2012. The $5 million increase in the provision for credit losses on lending-related commitments in the three months ended March 31, 2013, compared to the same period in 2012, resulted primarily from an increase in specific reserves in the first quarter 2013 for standby letters of credit, primarily attributable to a single borrower relationship in the Michigan market. Lending-related commitment charge-offs were insignificant for the three months ended March 31, 2013 and 2012.

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.

40

Noninterest Income

	Three Months Ended March 31,
(in millions)	2013		2012
Customer-driven income:
Service charges on deposit accounts	$	55	$	56
Fiduciary income	43		38
Commercial lending fees	21		25
Letter of credit fees	16		17
Card fees	12		11
Foreign exchange income	9		10
Brokerage fees	5		5
Other customer-driven income (a)	23		22
Total customer-driven noninterest income	184		184
Noncustomer-driven income:
Bank-owned life insurance	9		10
Net securities gains	—		5
Other noncustomer-driven income (a)	7		7
Total noninterest income	$	200	$	206

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

Noninterest income was $200 million for the three months ended March 31, 2013, a decrease of $6 million compared to $206 million for the same period in 2012. Fiduciary income increased $5 million, primarily reflecting an increase in personal trust fees, largely driven by an increase in the volume of fiduciary services sold and increases in market value. Commercial lending fees decreased $4 million in the three months ended March 31, 2013, compared to the same period in the prior year, primarily due to a decrease in syndication agent fees. Net securities gains decreased $5 million, as first quarter 2012 included net securities gains from the redemption of auction-rate securities.

	Three Months Ended March 31,
(in millions)	2013			2012
Other noninterest income:
Other customer-driven income:
Investment banking fees	$	5		$	6
Customer derivative income	4			3
Insurance commissions	4			3
All other customer-driven income	10			10
Total other customer-driven income	23			22
Other noncustomer-driven income:
Securities trading income	5			5
Deferred compensation asset returns (a)	3			4
Income from principal investing and warrants	2			1
Amortization of low income housing investments	(14		)	(14		)
All other noncustomer-driven income	11			11
Total other noncustomer-driven income	7			7
Total other noninterest income	$	30		$	29

(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.

41

Noninterest Expenses

	Three Months Ended March 31,
(in millions)	2013		2012
Salaries	$	188	$	201
Employee benefits	63		59
Total salaries and employee benefits	251		260
Net occupancy expense	39		41
Equipment expense	15		17
Outside processing fee expense	28		26
Software expense	22		23
FDIC insurance expense	9		10
Advertising expense	6		7
Other real estate expense	1		4
Other noninterest expenses	45		60
Total noninterest expenses	$	416	$	448

Noninterest expenses were $416 million for the three months ended March 31, 2013, a decrease of $32 million compared to $448 million for the same period in 2012. Salaries expense decreased $13 million, primarily due to a reduction in staffing levels, lower executive incentive compensation and one less day in the three months ended March 31, 2013, partially offset by an increase in business unit incentives and the impact of annual merit increases effective in the second quarter 2012. Employee benefits expense increased $4 million, primarily reflecting increased pension expense. Other real estate expense decreased $3 million in the three months ended March 31, 2013, compared to the same period in the prior year, primarily due to a decrease in carrying costs, reflecting a lower inventory of other real estate properties. Other noninterest expenses decreased $15 million, primarily reflecting a $10 million decrease in legal and litigation-related expenses, as well as smaller decreases in several other categories of other noninterest expense.

Provision for Income Taxes

The provision for income taxes for the first three months of 2013 was $50 million, compared to $48 million for the same period in 2012. The $2 million increase in the provision for income taxes in the first three months of 2013, compared to the same period in 2012, was primarily due to an increase in pretax income.

Net deferred tax assets were $222 million at March 31, 2013, compared to $254 million at December 31, 2012. The decrease of $32 million resulted primarily from the utilization of tax credits. Deferred tax assets were evaluated for realization and it was determined that no valuation allowance was needed at both March 31, 2013 and December 31, 2012. 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.

42

STRATEGIC LINES OF BUSINESS

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

In the first quarter 2013, the Corporation changed the method of assigning the allowance for loan losses to each segment. In 2012, national probability of default and loss given default statistics were incorporated into the Corporation's allowance methodology. Each segment was assigned an allowance for loan losses based on market-specific standard reserve factors applied to the loans in each segment, and the difference between the total allowance required on a national basis and the market-specific allowances was allocated based on the relative loan balances in each segment. Effective first quarter 2013, each segment is assigned an allowance for loan losses by applying national standard reserve factors to the loan balances in each segment by risk rating distribution. For comparability purposes, amounts in all periods are based on segments and methodologies in effect at March 31, 2013. For further information regarding the Corporation's segment methodologies, refer to page F-13 of the Corporation's 2012 Annual Report.

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 discontinued operations and 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, 2013 and 2012.

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

	Three Months Ended March 31,
(dollar amounts in millions)	2013					2012
Business Bank	$	198		85	%	$	203		89	%
Retail Bank	10			4		13			6
Wealth Management	25			11		13			5
	233			100	%	229			100	%
Finance	(98		)			(88		)
Other (a)	(1		)			(11		)
Total	$	134				$	130

(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, 2013 decreased $5 million, compared to $203 million for the three months ended March 31, 2012. Net interest income (FTE) of $375 million increased $2 million in the three months ended March 31, 2013, primarily due to the benefit provided by an increase of $2.5 billion in average loans, an increase in net funds transfer pricing (FTP) credits and lower deposit rates, partially offset by lower loan yields and a $9 million decrease in accretion of the purchase discount on the acquired loan portfolio. The increase in net FTP credits reflected the benefit provided by an increase of $1.5 billion in average deposits. The provision for credit losses increased $18 million, to $20 million for the three months ended March 31, 2013, compared to the same period in the prior year, primarily due to first quarter 2013 enhancements to the approach utilized to determine the allowance for loan losses and loan growth, partially offset by improvements in credit quality and reflecting increases in Middle Market, primarily in Technology and Life Sciences, and Corporate, partially offset by a decrease in Commercial Real Estate. Net credit-related charge-offs of $16 million decreased $12 million in the three months ended March 31, 2013, compared to the three months ended March 31, 2012, primarily reflecting a decrease in Commercial Real Estate. Noninterest income of $77 million for the three months ended March 31, 2013 decreased $4 million from the comparable period in the prior year, primarily due to a decrease in commercial lending fees ($4 million). Noninterest expenses of $146 million for the three months ended March 31, 2013 decreased $12 million compared to the same period in the prior year, primarily due to decreases in corporate overhead expense ($7 million) and lower processing costs ($3 million).

Net income for the Retail Bank of $10 million for the three months ended March 31, 2013 decreased $3 million, compared to $13 million for the three months ended March 31, 2012. Net interest income (FTE) of $155 million decreased $12 million in the three months ended March 31, 2013, primarily due to a $5 million decrease in accretion of the purchase discount on the acquired loan portfolio, lower loan yields and a $186 million decrease in average loans, partially offset by an increase in net FTP credits, primarily due to the benefit provided by an increase of $676 million in average deposits. The provision for credit losses of $6

43

million for the three months ended March 31, 2013 was unchanged from the comparable period in the prior year. Net credit-related charge-offs of $8 million for the three months ended March 31, 2013 decreased $4 million compared to the three months ended March 31, 2012, primarily reflecting a decrease in Small Business in the California market. Noninterest income of $41 million for the three months ended March 31, 2013 decreased $1 million compared to the three months ended March 31, 2012. Noninterest expenses of $175 million for the three months ended March 31, 2013 decreased $8 million from the comparable period in the prior year, primarily due to a decrease in corporate overhead expense ($4 million) and smaller decreases in several other noninterest expense categories.

Wealth Management's net income of $25 million for the three months ended March 31, 2013 increased $12 million, compared to $13 million for the three months ended March 31, 2012. Net interest income (FTE) of $46 million for the three months ended March 31, 2013 decreased $1 million compared to the three months ended March 31, 2012. Average deposits increased $71 million in the three months ended March 31, 2013 compared to the three months ended March 31, 2012, while average loans decreased $19 million. The provision for credit losses was a benefit of $6 million for the three months ended March 31, 2013, a decrease of $18 million compared to the three months ended March 31, 2012, primarily due to improvements in credit quality. Net credit-related charge-offs were insignificant for the three months ended March 31, 2013, compared to net credit-related charge-offs of $5 million in the three months ended March 31, 2012. Noninterest income of $65 million was unchanged from the comparable period in the prior year, as increases in fiduciary income ($3 million) and smaller increases in several noninterest income categories were offset by a decrease in net securities gains ($5 million). Noninterest expenses of $79 million for the three months ended March 31, 2013 decreased $1 million from the three months ended March 31, 2012.

The net loss in the Finance segment was $98 million for the three months ended March 31, 2013, compared to a net loss of $88 million for the three months ended March 31, 2012. Net interest expense (FTE) of $167 million for the three months ended March 31, 2013 increased $15 million, compared to the three months ended March 31, 2012, primarily reflecting a $10 million decrease in interest earned on mortgage-backed investment securities. Noninterest income of $14 million for the three months ended March 31, 2013 increased $1 million compared to the three months ended March 31, 2012. Noninterest expenses of $3 million for the three months ended March 31, 2013 were unchanged from the comparable period in the prior year.

The net loss in the Other category of $1 million for the three months ended March 31, 2013 decreased $10 million, compared to a net loss of $11 million for the three months ended March 31, 2012. The decrease in net loss primarily reflected an $11 million decrease in noninterest expenses, primarily due to an $8 million decrease in litigation-related expenses.

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. The table and narrative below present the market results based on the structure and methodologies in effect at March 31, 2013. 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, 2013 and 2012.

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

	Three Months Ended March 31,
(dollar amounts in millions)	2013					2012
Michigan	$	77		33	%	$	78		34	%
California	56			24		64			28
Texas	44			19		41			18
Other Markets	56			24		46			20
	233			100	%	229			100	%
Finance & Other (a)	(99		)			(99		)
Total	$	134				$	130

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

The Michigan market's net income of $77 million for the three months ended March 31, 2013 decreased $1 million, compared to $78 million for the three months ended March 31, 2012. Net interest income (FTE) of $189 million for the three months ended March 31, 2013 decreased $7 million from the comparable period in the prior year, primarily due to lower loan yields and the impact of a $179 million decrease in average loans, partially offset by lower deposit rates and a decrease in net FTP costs, reflecting the benefit provided by a $840 million increase in average deposits. The provision for credit losses was a benefit of $8 million for the three months ended March 31, 2013, a decrease of $5 million compared to the same period in the prior year, primarily due to improvements in credit quality and largely reflecting decreases in Commercial Real Estate and Private Banking, partially offset by increases in Corporate and Small Business. Net credit-related charge-offs of $5 million for the three months ended March 31, 2013 decreased $13 million from the comparable period in the prior year, primarily reflecting decreases in

44

Commercial Real Estate, Middle Market and Private Banking. Noninterest income of $92 million for the three months ended March 31, 2013 decreased $6 million from the comparable period in 2012, primarily due to decreases in card fees ($5 million) and commercial lending fees ($3 million). Noninterest expenses of $168 million in the three months ended March 31, 2013 decreased $11 million from the comparable period in the prior year, primarily due to decreases in corporate overhead expense ($6 million) and smaller decreases in several other noninterest expense categories.

The California market's net income of $56 million decreased $8 million in the three months ended March 31, 2013, compared to $64 million for the three months ended March 31, 2012. Net interest income (FTE) of $171 million for the three months ended March 31, 2013 increased $6 million from the comparable period in the prior year, primarily due to the benefit provided by a $1.4 billion increase in average loans and an increase in net FTP credits, reflecting the benefit provided by a $668 million increase in average deposits, partially offset by lower loan yields. The provision for credit losses of $21 million in the three months ended March 31, 2013 increased $24 million from the comparable period in the prior year, primarily due to first quarter 2013 enhancements to the approach utilized to determine the allowance for loan losses and loan growth and primarily reflecting increases in Technology and Life Sciences and general Middle Market. Net credit-related charge-offs of $10 million in the three months ended March 31, 2013 decreased $1 million compared to the three months ended March 31, 2012, primarily reflecting decreases in Small Business and Commercial Real Estate, partially offset by an increase in Technology and Life Sciences. Noninterest income of $35 million for the three months ended March 31, 2013 increased $2 million from the comparable period in prior year, primarily due to an increase in card fees. Noninterest expenses of $97 million in the three months ended March 31, 2013 decreased $2 million from the comparable period in the prior year, primarily due to a decrease in corporate overhead expense ($3 million).

The Texas market's net income increased $3 million to $44 million for the three months ended March 31, 2013, compared to $41 million for the three months ended March 31, 2012. Net interest income (FTE) of $135 million for the three months ended March 31, 2013 decreased $15 million from the comparable period in the prior year, primarily due to a decrease in accretion of the purchase discount on the acquired loan portfolio of $14 million and lower loan yields, partially offset by the benefit provided by a $776 million increase in average loans. Average deposits decreased $270 million in the three months ended March 31, 2013, compared to the same period in the prior year. The provision for credit losses of $8 million for the three months ended March 31, 2013 decreased $17 million from the comparable period in the prior year, primarily due to improvements in credit quality. Improvements in credit quality included a decline of $201 million in internal watch list loans from March 31, 2012 to March 31, 2013. Net credit-related charge-offs of $6 million for the three months ended March 31, 2013 decreased $1 million from the comparable period in the prior year. Noninterest income of $31 million for the three months ended March 31, 2013 was unchanged from the comparable period in the prior year. Noninterest expenses of $91 million for the three months ended March 31, 2013 decreased $2 million from the three months ended March 31, 2012, primarily reflecting a decrease in corporate overhead expense ($2 million).

Net income in Other Markets of $56 million for the three months ended March 31, 2013 increased $10 million compared to $46 million for the three months ended March 31, 2012. Net interest income (FTE) of $81 million for the three months ended March 31, 2013 increased $5 million from the comparable period in the prior year, primarily due to an increase in net FTP credits, primarily the result of the benefits provided by increases of $1.0 billion in average deposits and $305 million in average loans. The provision for credit losses decreased $2 million in the three months ended March 31, 2013, compared to the same period in the prior year, primarily due to improvements in credit quality. Net credit-related charge-offs of $3 million for the three months ended March 31, 2013 decreased $6 million from the comparable period in the prior year, primarily reflecting decreases in Commercial Real Estate and Private Banking, partially offset by an increase in Environmental Services. Noninterest income of $25 million for the three months ended March 31, 2013 decreased $1 million from the comparable period in the prior year, reflecting a decrease in net securities gains ($5 million), as first quarter 2012 included net securities gains from the redemption of auction-rate securities were partially offset by small increases in several other noninterest income categories. Noninterest expenses of $44 million for the three months ended March 31, 2013 decreased $6 million from the comparable period in the prior year, primarily due to decreases in corporate overhead expense ($2 million) and smaller decreases in several other noninterest expense categories.

The net loss for the Finance & Other category of $99 million in the three months ended March 31, 2013 was unchanged compared to the three months ended March 31, 2012. For further information, refer to the Finance segment and Other category discussions under the "Business Segments" subheading above.

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

	March 31,
	2013	2012
Michigan	216	218
Texas	137	142
California	105	105
Other Markets:
Arizona	18	18
Florida	10	11
Canada	1	1
Total Other Markets	29	30
Total	487	495

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FINANCIAL CONDITION

Total assets were $64.9 billion at March 31, 2013, a decrease of $184 million from $65.1 billion at December 31, 2012, primarily reflecting decreases of $990 million in total loans and $518 million in cash and due from banks, partially offset by a $1.7 billion increase in interest-bearing deposits with banks. On an average basis, total assets decreased $806 million to $63.5 billion in the first quarter 2013, compared to $64.3 billion in the fourth quarter 2012, resulting primarily from decreases of $933 million in average interest-bearing deposits with banks, $229 million in average investment securities available-for-sale and $107 million in accrued income and other assets, partially offset by an increase of $498 million in average loans.

The following tables provide information about the change in the Corporation's average loan portfolio in the first quarter 2013, compared to the fourth quarter 2012.

	Three Months Ended							Percent Change
(dollar amounts in millions)	March 31, 2013		December 31, 2012		Change
Average Loans:
Commercial loans by business line:
General Middle Market	$	9,941	$	9,643	$	298		3	%
National Dealer Services	3,377		3,141		236			8
Energy	2,969		2,816		153			5
Technology and Life Sciences	1,888		1,776		112			6
Environmental Services	711		678		33			5
Entertainment	604		637		(33		)	(5	)
Total Middle Market	19,490		18,691		799			4
Corporate	3,441		3,354		87			3
Mortgage Banker Finance	1,737		2,094		(357		)	(17	)
Commercial Real Estate	718		741		(23		)	(3	)
Total Business Bank commercial loans	25,386		24,880		506			2
Total Retail Bank commercial loans	1,278		1,200		78			6
Total Wealth Management commercial loans	1,392		1,382		10			1
Total commercial loans	28,056		27,462		594			2
Real estate construction loans	1,314		1,299		15			1
Commercial mortgage loans	9,398		9,519		(121		)	(1	)
Lease financing	857		839		18			2
International loans	1,282		1,314		(32		)	(2	)
Residential mortgage loans	1,556		1,525		31			2
Consumer loans	2,154		2,161		(7		)	—
Total loans	$	44,617	$	44,119	$	498		1	%
Average Loans By Geographic Market:
Michigan	$	13,650	$	13,415	$	235		2	%
California	13,542		13,275		267			2
Texas	10,071		9,818		253			3
Other Markets	7,354		7,611		(257		)	(3	)
Total loans	$	44,617	$	44,119	$	498		1	%

Average loans for the three months ended March 31, 2013 increased $498 million, or 1 percent, to $44.6 billion, compared to $44.1 billion for the three months ended December 31, 2012, reflecting an increase of $594 million, or 2 percent in average commercial loans, partially offset by a decrease of $106 million, or 1 percent, in combined commercial mortgage and real estate construction loans. The $594 million increase in average commercial loans primarily reflected an increase in Middle Market ($799 million), partially offset by a decrease in Mortgage Banker Finance ($357 million). The decline in Mortgage Banker Finance, which provides mortgage warehousing lines, reflected a decline in refinancing activity. The increase in Middle Market primarily reflected increases in general Middle Market ($298 million), National Dealer Services ($236 million), Energy ($153 million), and Technology and Life Sciences ($112 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, and Small Business serves customers with revenue under $20 million. Changes in average total loans by geographic market is provided in the table above.

Total liabilities decreased $230 million to $57.9 billion at March 31, 2013, compared to $58.1 billion at December 31, 2012, primarily due to decreases of $502 million in noninterest-bearing deposits and $83 million in accrued expenses and other liabilities, partially offset by a $428 million increase in interest-bearing deposits. On an average basis, total liabilities decreased

47

$700 million in the first quarter 2013 compared to the fourth quarter 2012, primarily due to a decrease of $1.3 billion in average noninterest-bearing deposits, partially offset by an increase of $662 million in average interest-bearing deposits. The decrease in average noninterest-bearing deposits primarily reflected a decrease in Middle Market ($1.0 billion), largely due to a decline in the Financial Services Division in general Middle Market, which provides services to title and escrow companies. The increase in average interest-bearing deposits primarily reflected increases of $534 million in money market and interest-bearing checking deposits and $110 million in customer certificates of deposit. By geographic market, the decrease in average total deposits of $590 million from the fourth quarter 2012 to the first quarter 2013 primarily reflected a decrease in the California market ($1.1 billion), partially offset by increases in the Michigan market ($237 million), Other Markets ($202 million) and the Texas market ($150 million). The decrease in the California market primarily reflected decreases in the Financial Services Division, Private Banking and Technology and Life Sciences, partially offset by an increase in Corporate.

Capital

Total shareholders' equity increased $46 million to $7.0 billion at March 31, 2013, compared to December 31, 2012. The following table presents a summary of changes in total shareholders' equity in the three months ended March 31, 2013.

(in millions)
Balance at January 1, 2013				$	6,942
Net income				134
Cash dividends declared on common stock				(32		)
Purchase of common stock				(74		)
Other comprehensive income (loss):
Investment securities available-for-sale	$	(11	)
Defined benefit and other postretirement plans	14
Total other comprehensive income				3
Issuance of common stock under employee stock plans				5
Share-based compensation				10
Balance at March 31, 2013				$	6,988

The Federal Reserve completed its review of the Corporation's 2013 capital plan in March 2013 and did not object to the capital distributions contemplated in the plan. The capital plan includes up to $288 million of equity repurchases for the four-quarter period ending March 31, 2014. In January 2013, the Corporation declared a quarterly cash dividend of $0.17 per share, an increase of 13 percent from the fourth quarter 2012 quarterly dividend of $0.15 per share. The January 2013 dividend increase was contemplated in the Corporation's 2012 capital plan.

On November 16, 2010, the Board of Directors of the Corporation authorized the repurchase of up to 12.6 million shares of Comerica Incorporated outstanding common stock and authorized the purchase of up to all 11.5 million of the Corporation's original outstanding warrants. On April 24, 2012 and April 23, 2013, the Board authorized the repurchase of up to an additional 5.7 million shares and up to an additional 10.0 million shares of Comerica Incorporated outstanding common stock, respectively. There is no expiration date for the Corporation's share repurchase program. For further information regarding the repurchase program, refer to Note 13 to the consolidated financial statements in the Corporation's 2012 Annual Report. The following table summarizes the Corporation's repurchase activity during the three months ended March 31, 2013.

(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 2013	837	14,714	926	$	32.79	$	—
February 2013	973	13,741	976	34.64		—
March 2013	280	13,461	280	35.30		—
Total first quarter 2013	2,090	13,461	2,182	$	33.94	$	—

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

(b) Includes approximately 92 thousand shares 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, 2013 . 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, 2013.

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. As shown in the table below, the Corporation's capital ratios increased from December 31, 2012 to March 31, 2013.

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

	March 31, 2013				December 31, 2012
(dollar amounts in millions)	Capital		Ratio		Capital		Ratio
Tier 1 common (a) (b)	$	6,748	10.40	%	$	6,705	10.17	%
Tier 1 risk-based (4.00% - minimum) (b)	6,748		10.40		6,705		10.17
Total risk-based (8.00% - minimum) (b)	8,730		13.45		8,695		13.18
Leverage (3.00% - minimum) (b)	6,748		10.76		6,705		10.57
Tangible common equity (a)	6,332		9.86		6,285		9.76

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

(b) March 31, 2013 capital and ratios are estimated.

In December 2010, the Basel Committee on Banking Supervision (the Basel Committee) issued a framework for strengthening international capital and liquidity regulation (Basel III). In June 2012, U.S. banking regulators issued proposed rules for the U.S. adoption of the Basel III regulatory capital framework. The proposed 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. Under the proposal, rules are expected to be implemented between 2013 and 2019.

According to the proposed rules, the Corporation will be subject to the capital conservation buffer of 2.5 percent to avoid restrictions on capital distributions and discretionary bonuses. However, the rules as proposed would not subject the Corporation to the capital countercyclical buffer of up to 2.5 percent or the supplemental leverage ratio. The Corporation currently estimates that its March 31, 2013 capital ratios would be in compliance with the fully phased-in Basel III capital rules as proposed. Under the proposed rules, the Corporation estimates the March 31, 2013 Tier 1 and Tier 1 common risk-based ratio would be 9.4 percent if calculated under the proposed rules. For a reconcilement of this non-GAAP financial measure, refer to the "Supplemental Financial Data" section of this financial review.

The Basel III liquidity framework, which was revised by the Basel Committee in January 2013, includes two minimum liquidity measures. Rules are expected to be implemented between 2015 and 2019. Adoption in the U.S. is expected to occur over a similar timeframe, but the final form of the U.S. rules is not yet known. The Liquidity Coverage Ratio (LCR) requires a financial institution to hold a buffer of high-quality, liquid assets to fully cover net cash outflows under a 30-day systematic liquidity stress scenario. The revisions announced by the Basel Committee in January 2013 eased several requirements related to the LCR, including certain outflow assumptions. The Net Stable Funding Ratio 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 Corporation's liquidity position is strong, but if subject to the Basel III liquidity framework as currently proposed, the Corporation may decide to consider additional liquidity management initiatives. While uncertainty exists in the final form and timing of the U.S. rules implementing the Basel III liquidity framework and whether or not the Corporation will be subject to the full requirements, the Corporation is closely monitoring the development of the rules. We expect to meet the final requirements adopted by U.S. banking regulators within regulatory timelines.

49

RISK MANAGMENT

The following updated information should be read in conjunction with the "Risk Management" section on pages F-23 through F-41 in the Corporation's 2012 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. In the first quarter 2013, the Corporation implemented enhancements to the approach utilized for determining standard reserve factors for business loans not individually evaluated by changing from a dollar-based migration method for developing probability of default statistics to a count-based method. Under the dollar-based method, each dollar that moved to default received equal weight in the determination of standard reserve factors for each internal risk rating. As a result, the movement of larger loans impacted standard reserve factors more than the movement of smaller loans. By moving to a count-based approach, where each loan that moves to default receives equal weighting, unusually large or small loans will not have a disproportionate influence on the standard reserve factors. The change resulted in a $40 million increase to the allowance for loan losses at March 31, 2013.

At the start of 2013, the U.S. economy was still being influenced by a mix of forces that together, were providing some forward momentum, but were not allowing the economy to grow at its full potential. Monetary policy over the previous quarter was highly accommodative as the Federal Reserve ended its program of reconfiguring its balance sheet, known as"Operation Twist," in December 2012 and launched a new program of outright bond purchases known as "QE3." The fed funds rate has remained exceptionally low, near-zero, and is now linked to a 6.5 percent threshold for the unemployment rate. That threshold is not expected to be reached until late 2014 through mid-2015. Federal fiscal policy tightened at the start of 2013 as federal payroll taxes increased for all workers and income, dividend and capital gains taxes increased for the wealthiest households. The expected combination of tax increases and spending cuts, known as "the Fiscal Cliff," impaired business confidence in late 2012 and early 2013. Fiscal tightening continued through early 2013 as the federal budget sequester enforced cutbacks in defense and non-defense discretionary spending, beginning March 1, 2013. Within the context of expansive monetary policy, repressive fiscal policy and subdued global growth, the domestic U.S. economy began to show more signs of improving over the course of 2012. Residential real estate markets firmed nationwide as residential construction increased and housing prices showed consistent year-over-year price gains. Auto sales improved through the year. Momentum in housing and auto sales is expected to continue through 2013. Commercial real estate markets are expected to show more signs of firming up. Oil drilling activity is expected to remain strong through 2013. Natural gas prices firmed in early 2013 though natural gas drilling activity is expected to remain cooler in 2013 than in recent years. Real Gross Domestic Product growth for the U.S. is expected to average a moderate 2.2 percent over the course of 2013, matching the moderate pace for 2012. The Texas economy will continue to be a job growth leader over 2013. Michigan is expected to benefit from moderate gains in auto sales over the course of 2013, and from firmer commercial and residential real estate conditions. California will feel the broad positive effects of improved real estate markets in the year ahead. High technology industries in Northern California are expected to continue to drive growth for the state.

The allowance for loan losses was $617 million at March 31, 2013, compared to $629 million at December 31, 2012, a decrease of $12 million, or 2 percent. The decrease resulted primarily from a reduction in specific reserves required on collateral-dependent impaired loans, the elimination of certain incremental industry reserves and decreases in loan balances, partially offset by an increase in the allowance for loan losses resulting from the enhancements to the approach utilized for determining standard reserve factors described above. The $12 million decrease in the allowance for loan losses primarily reflected decreased reserves in Commercial Real Estate, general Middle Market, Private Banking and Mortgage Banker Finance, partially offset by increased reserves in Technology and Life Sciences. By market, reserves decreased in Michigan, Other Markets and Texas and increased in California, primarily due to increased reserves in Technology and Life Sciences.

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

50

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, 2013, there was no allowance for loan losses on acquired loans, and $34 million of purchase discount remained, compared to a $3 million allowance for loan losses and $41 million of remaining purchase discount at December 31, 2012.

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. 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.

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 $36 million at March 31, 2013, an increase of $4 million from $32 million at December 31, 2012. The $4 million increase in the allowance for credit losses on lending-related commitments resulted primarily from an increase in specific reserves in the first quarter 2013 for standby letters of credit, primarily attributable to a single borrower relationship in the Michigan market. An allowance for credit losses will be recorded on acquired lending-related commitments only to the extent that the required allowance exceeds the remaining purchase discount. The purchase discount remaining for acquired lending-related commitments was $2 million at both March 31, 2013 and December 31, 2012. No allowance was recorded on acquired lending-related commitments at March 31, 2013 and December 31, 2012.

For additional information regarding the allowance for credit losses, refer to the "Critical Accounting Policies" section of this financial review and Notes 1 and 4 to these unaudited consolidated financial statements.

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.

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SUMMARY OF NONPERFORMING ASSETS AND PAST DUE LOANS

(dollar amounts in millions)	March 31, 2013			December 31, 2012
Nonaccrual loans:
Business loans:
Commercial	$	102		$	103
Real estate construction:
Commercial Real Estate business line (a)	30			30
Other business lines (b)	3			3
Total real estate construction	33			33
Commercial mortgage:
Commercial Real Estate business line (a)	86			94
Other business lines (b)	178			181
Total commercial mortgage	264			275
Lease financing	—			3
Total nonaccrual business loans	399			414
Retail loans:
Residential mortgage	65			70
Consumer:
Home equity	28			31
Other consumer	2			4
Total consumer	30			35
Total nonaccrual retail loans	95			105
Total nonaccrual loans	494			519
Reduced-rate loans	21			22
Total nonperforming loans	515			541
Foreclosed property	40			54
Total nonperforming assets	$	555		$	595
Nonperforming loans as a percentage of total loans	1.14		%	1.17		%
Nonperforming assets as a percentage of total loans and foreclosed property	1.23			1.29
Allowance for loan losses as a percentage of total nonperforming loans	120			116
Loans past due 90 days or more and still accruing	$	25		$	23
Loans past due 90 days or more and still accruing as a percentage of total loans	0.05		%	0.05		%

(a) Primarily loans to real estate investors and developers.

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

Nonperforming assets decreased $40 million to $555 million at March 31, 2013, from $595 million at December 31, 2012. The decrease in nonperforming assets primarily reflected decreases in foreclosed property ($14 million), nonaccrual commercial mortgage loans ($11 million) and nonaccrual residential mortgage loans ($5 million). Nonperforming assets as a percentage of total loans and foreclosed property was 1.23 percent at March 31, 2013, compared to 1.29 percent at December 31, 2012.

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

	Three Months Ended
(in millions)	March 31, 2013			December 31, 2012
Balance at beginning of period	$	519		$	665
Loans transferred to nonaccrual (a)	34			36
Nonaccrual business loan gross charge-offs (b)	(34		)	(54		)
Nonaccrual business loans sold (c)	(7		)	(48		)
Payments/Other (d)	(18		)	(80		)
Balance at end of period	$	494		$	519
(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	$	34		$	54
Retail loans	4			6
Total gross loan charge-offs	$	38		$	60
(c) Analysis of loans sold:
Nonaccrual business loans	$	7		$	48
Performing watch list loans	12			24
Total loans sold	$	19		$	72
(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 8 borrowers with balances greater than $2 million, totaling $34 million, transferred to nonaccrual status in the first quarter 2013, a decrease of $2 million when compared to $36 million in the fourth quarter 2012. Of the transfers to nonaccrual greater than $2 million in the first quarter 2013, $27 million were from Middle Market. There were no borrowers with balances greater than $10 million transferred to nonaccrual in the first quarter 2013.

The following table presents the composition of nonaccrual loans by balance and the related number of borrowers at March 31, 2013 and December 31, 2012.

	March 31, 2013			December 31, 2012
(dollar amounts in millions)	Number of Borrowers	Balance		Number of Borrowers	Balance
Under $2 million	1,635	$	265	1,609	$	277
$2 million - $5 million	29	89		35	112
$5 million - $10 million	13	89		11	82
$10 million - $25 million	4	51		4	48
Total	1,681	$	494	1,659	$	519

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The following table presents a summary of nonaccrual loans at March 31, 2013 and loans transferred to nonaccrual and net loan charge-offs for the three months ended March 31, 2013, based primarily on Standard Industrial Classification (SIC) industry categories.

	March 31, 2013				Three Months Ended March 31, 2013
(dollar amounts in millions)	Nonaccrual Loans				Loans Transferred to Nonaccrual (a)				Net Loan Charge-Offs (Recoveries)
Industry Category
Real Estate	$	141	29	%	$	—	—	%	$	(3	)	(13	)%
Services	77		16		10		28		7			30
Residential Mortgage	68		14		—		—		—			—
Holding & Other Investment Companies	42		8		—		—		2			10
Retail Trade	39		8		14		42		3			11
Hotels	31		6		—		—		3			11
Manufacturing	22		4		—		—		1			4
Utilities	21		4		7		21		7			28
Wholesale Trade	13		3		3		9		2			7
Contractors	6		1		—		—		—			(1	)
Natural Resources	5		1		—		—		1			6
Finance	4		1		—		—		—			—
Transportation & Warehousing	1		—		—		—		(1		)	(3	)
Other (b)	24		5		—		—		2			10
Total	$	494	100	%	$	34	100	%	$	24		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, 2013 and December 31, 2012.

(in millions)	March 31, 2013		December 31, 2012
Nonperforming TDRs:
Nonaccrual TDRs	$	127	$	118
Reduced-rate TDRs	21		22
Total nonperforming TDRs	148		140
Performing TDRs (a)	85		92
Total TDRs	$	233	$	232

(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 included $46 million of commercial mortgage loans (primarily in the Commercial Real Estate and Small Business Banking business lines) and $38 million of commercial loans (primarily in the Middle Market and Corporate business lines) at March 31, 2013.

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

(in millions)	March 31, 2013		December 31, 2012
Business loans:
Commercial	$	2	$	5
Commercial mortgage	15		8
International	—		3
Total business loans	17		16
Retail loans:
Residential mortgage	3		2
Other consumer	5		5
Total retail loans	8		7
Total loans past due 90 days or more and still accruing	$	25	$	23

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 decreased $11 million to $169 million at March 31, 2013, compared to $158 million at December 31, 2012.

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The following table presents a summary of total internal watch list loans. Watch list 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, 2013			December 31, 2012
Total watch list loans	$	3,110		$	3,088
As a percentage of total loans	6.9		%	6.7		%

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

(in millions)	March 31, 2013		December 31, 2012
Construction, land development and other land	$	11	$	16
Single family residential properties	10		19
Other non-land, nonresidential properties	12		12
Other assets	7		7
Total foreclosed property	$	40	$	54

At March 31, 2013, foreclosed property totaled $40 million and consisted of approximately 142 properties, compared to $54 million and approximately 149 properties at December 31, 2012.

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

	Three Months Ended
(in millions)	March 31, 2013			December 31, 2012
Balance at beginning of period	$	54		$	63
Acquired in foreclosure	5			11
Write-downs	(2		)	(3		)
Foreclosed property sold (a)	(17		)	(17		)
Balance at end of period	$	40		$	54
(a) Net gain on foreclosed property sold	$	1		$	4

At March 31, 2013, there were 3 foreclosed properties each with a carrying value greater than $2 million, totaling $13 million, compared to 6 foreclosed properties totaling $27 million at December 31, 2012. At March 31, 2013, there were no foreclosed properties with a carrying value greater than $10 million March 31, 2013 and December 31, 2012.

For further information regarding the Corporation's nonperforming assets policies and impaired loans, refer to Note 1 and Note 4 to the consolidated financial statements.

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, 2013		December 31, 2012
Real estate construction loans:
Commercial Real Estate business line (a)	$	1,185	$	1,049
Other business lines (b)	211		191
Total real estate construction loans	$	1,396	$	1,240
Commercial mortgage loans:
Commercial Real Estate business line (a)	$	1,812	$	1,873
Other business lines (b)	7,505		7,599
Total commercial mortgage loans	$	9,317	$	9,472

(a) Primarily loans to real estate investors and 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 $10.7 billion at March 31, 2013, of which $3.0 billion, or 28 percent, were to borrowers in the Commercial Real Estate business line, which includes loans to real estate investors and developers. The remaining $7.7 billion, or 72 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.

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The real estate construction loan portfolio totaled $1.4 billion at March 31, 2013. The real estate construction loan portfolio primarily contains loans made to long-time customers with satisfactory completion experience. Of the $1.2 billion of real estate construction loans in the Commercial Real Estate business line, $30 million were on nonaccrual status at March 31, 2013. In other business lines, $3 million of real estate construction loans were on nonaccrual status at March 31, 2013. There were net residential construction loan recoveries of $1 million for the three months ended March 31, 2013.

The commercial mortgage loan portfolio totaled $9.3 billion at March 31, 2013 and included $1.8 billion in the Commercial Real Estate business line and $7.5 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, $86 million were on nonaccrual status at March 31, 2013. Commercial mortgage loan net charge-offs in the Commercial Real Estate business line were insignificant for the three months ended March 31, 2013. In other business lines, $178 million of commercial mortgage loans were on nonaccrual status at March 31, 2013, and net charge-offs were $8 million for the three months ended March 31, 2013.

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, 2013
	Location of Property														December 31, 2012
(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	$	119	$	5	$	42	$	9	$	28	$	203	18	%	$	156	15	%
Land development	33		5		3		—		1		42		4		44		4
Total residential	152		10		45		9		29		245		22		200		19
Other construction:
Multi-family	228		—		249		18		31		526		43		406		39
Retail	60		38		85		1		—		184		15		182		17
Office	108		—		18		—		—		126		11		121		12
Multi-use	—		8		23		—		3		34		3		43		4
Land development	3		8		8		—		—		19		2		25		2
Commercial	14		2		1		—		—		17		1		40		4
Other	5		5		—		2		—		12		1		6		1
Other real estate construction loans (a)	—		—		22		—		—		22		2		26		2
Total	$	570	$	71	$	451	$	30	$	63	$	1,185	100	%	$	1,049	100	%
Commercial mortgage loans:
Commercial Real Estate business line:
Residential:
Land carry	$	59	$	28	$	9	$	18	$	35	$	149	8	%	$	143	8	%
Single family	21		3		6		1		6		37		2		48		2
Total residential	80		31		15		19		41		186		10		191		10
Other commercial mortgage:
Multi-family	167		48		115		105		3		438		24		376		20
Retail	114		60		60		40		65		339		18		368		20
Office	74		33		44		—		35		186		10		193		10
Commercial	78		29		22		1		25		155		9		167		9
Multi-use	106		7		3		—		9		125		7		161		9
Land carry	54		12		28		8		18		120		7		122		6
Other	37		2		31		—		—		70		4		69		4
Other commercial mortgage loans (a)	20		1		168		4		—		193		11		226		12
Total	$	730	$	223	$	486	$	177	$	196	$	1,812	100	%	$	1,873	100	%

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

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

	March 31, 2013								December 31, 2012
(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	$	429	27	%	$	849	57	%	$	433	28	%	$	871	57	%
California	585		38		396		26		523		35		404		26
Texas	316		20		211		14		320		21		212		14
Other Markets	238		15		42		3		251		16		50		3
Total	$	1,568	100	%	$	1,498	100	%	$	1,527	100	%	$	1,537	100	%

Residential real estate loans, which consist of traditional residential mortgages and home equity loans and lines of credit, totaled $3.1 billion at March 31, 2013. Residential mortgages totaled $1.6 billion at March 31, 2013, and were primarily larger, variable-rate mortgages originated and retained for certain private banking relationship customers. Of the $1.6 billion of residential mortgage loans outstanding, $65 million were on nonaccrual status at March 31, 2013. The home equity portfolio totaled $1.5 billion at March 31, 2013, of which $1.4 billion was outstanding under primarily variable-rate, interest-only home equity lines of credit and $135 million were closed-end home equity loans. Of the $1.5 billion of home equity loans outstanding, $28 million were on nonaccrual status at March 31, 2013. A majority of the home equity portfolio was secured by junior liens at March 31, 2013. The residential real estate portfolio is principally located within the Corporation's primary geographic markets. The economic recession and significant declines in home values following the financial market turmoil beginning in the fall of 2008 adversely impacted the residential real estate portfolio. As of March 31, 2013, substantially all residential real estate loans past due 90 days or more were placed on nonaccrual status, and substantially all junior lien home equity loans that were current or less than 90 days past due were placed on nonaccrual status if full collection of the senior position was in doubt. Such loans are charged off to current appraised values less costs to sell no later than 180 days past due.

Shared National Credits

Shared National Credit (SNC) loans are facilities greater than $20 million shared by three or more federally supervised financial institutions that are reviewed annually 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 (876 borrowers at March 31, 2013) were $9.4 billion at both March 31, 2013 and December 31, 2012. SNC net loan charge-offs totaled $3 million for the three months ended March 31, 2013 compared to $14 million for the three months ended March 31, 2012. Nonaccrual SNC loans increased $10 million to $34 million at March 31, 2013, compared to $24 million at December 31, 2012. SNC loans, diversified by both business line and geographic market, comprised approximately 21 percent and 20 percent of total loans at March 31, 2013 and December 31, 2012, respectively. SNC loans are held to the same credit underwriting and pricing standards as the remainder of the loan portfolio.

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. Average loans in the Middle Market - Energy business line for the three months ended March 31, 2013 were $3.0 billion, or approximately 7 percent of total average loans, compared to $2.9 billion, or approximately 6 percent of total average loans, for the three months ended December 31, 2012. Nonaccrual Middle Market - Energy loans totaled $1 million and $3 million at March 31, 2013 and December 31, 2012, respectively. Middle Market - Energy net loan charge-offs totaled $2 million for both the three-month periods ended March 31, 2013 and 2012. Energy loans are diverse in nature, with outstanding balances by customer market segment distributed approximately as follows at March 31, 2013: 67 percent exploration and production (comprised of approximately 50 percent oil, 31 percent mixed and 19 percent natural gas), 19 percent midstream and 14 percent energy services.

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 $3.0 billion at March 31, 2013, an increase of $24 million compared to $2.9 billion at December 31, 2012. At March 31, 2013, other loans to automotive dealers in the National Dealer Services business line totaled $2.0 billion, including $1.5 billion of owner-occupied commercial real estate mortgage loans, compared to $2.2 billion of other loans to automotive dealers in the National Dealer Service line, including $1.5 billion of owner-occupied commercial real estate mortgage loans, at December 31, 2012 . 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 March 31, 2013, compared to $1.2 billion at December 31, 2012.

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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, 2013 and December 31, 2012.

(in millions)	March 31, 2013		December 31, 2012
Loans outstanding	$	42	$	53
Lease financing	358		359
Investment securities available-for-sale	23		23
Trading account securities	7		19
Standby letters of credit	108		108
Unused commitments to extend credit	37		24
Total direct exposure to state and local municipalities	$	575	$	586

Indirect exposure comprised $125 million in auction-rate preferred securities collateralized by municipal securities at March 31, 2013, compared to $127 million at December 31, 2012. 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 March 31, 2013 and December 31, 2012, all outstanding municipal loans and leases were performing according to contractual terms, and one municipal lease was included in the Corporation's internal watch list. Municipal leases are secured by the underlying equipment, and a substantial majority of the leases are fully defeased with AAA-rated U.S. government securities. Substantially all municipal investment securities available-for sale are auction-rate securities. All auction-rate securities are reviewed quarterly for other-than-temporary impairment. All auction-rate municipal securities were rated investment grade, and all auction-rate preferred securities collateralized by municipal securities were rated investment grade and were adequately collateralized at both March 31, 2013 and December 31, 2012. Municipal securities are held in the trading account for resale to customers. In addition, Comerica Securities, a broker-dealer subsidiary of Comerica Bank, underwrites bonds issued by municipalities. All bonds underwritten by Comerica Securities are sold to third party investors.

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.

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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, 2013 and December 31, 2012.

	Outstanding (a)
(in millions)	Commercial and Industrial		Banks and Other Financial Institutions		Total Outstanding		Unfunded Commitments and Guarantees		Total Exposure
March 31, 2013
United Kingdom	$	89	$	2	$	91	$	159	$	250
Netherlands	53		—		53		74		127
Germany	2		3		5		55		60
Ireland	10		—		10		20		30
Switzerland	—		20		20		3		23
Luxembourg	1		—		1		19		20
Sweden	9		—		9		10		19
Belgium	—		—		—		18		18
Italy	7		1		8		—		8
France	—		4		4		1		5
Denmark	—		3		3		—		3
Spain	2		—		2		—		2
Hungary	—		1		1		—		1
Total Europe	$	173	$	34	$	207	$	359	$	566
December 31, 2012
United Kingdom	$	110	$	10	$	120	$	149	$	269
Netherlands	61		—		61		72		133
Germany	2		3		5		49		54
Ireland	18		—		18		12		30
Switzerland	13		7		20		2		22
Luxembourg	1		—		1		19		20
Sweden	9		—		9		10		19
Belgium	2		—		2		15		17
Italy	6		1		7		—		7
Spain	2		—		2		—		2
France	—		3		3		—		3
Total Europe	$	224	$	24	$	248	$	328	$	576

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

For further discussion of credit risk, see the "Credit Risk" section of pages F-23 through F-35 in the Corporation's 2012 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 Department supports ALCO in measuring, monitoring and managing interest rate, liquidity and coordination of all other market risks. The area's 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) development and presentation of analysis and strategies to adjust risk positions; (iv) review and presentation of 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

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risks; (vi) developing and monitoring the interest rate risk economic capital estimate; and (vii) monitoring of capital adequacy in accordance with the Capital Management Policy.

Interest Rate Risk

Net interest income is the primary source of revenue for the Corporation. Interest rate risk arises primarily through the Corporation's core business activities of extending loans and accepting 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, 2013, of which approximately 75 percent were based on LIBOR and 25 percent were based on Prime. This creates a natural imbalance between the floating-rate loan portfolio and the more slowly repricing deposit products. The result is that growth and/or contraction in the Corporation's core businesses may lead to 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.

The Corporation frequently evaluates net interest income under various balance sheet and interest rate scenarios, looking at a 12-month time horizon, using simulation modeling analysis as its principal risk management evaluation technique. The results of this analysis provides the information needed to assess the balance sheet structure. Changes in economic activity, whether domestic or international, different from the changes management included in its simulation analysis could translate into a materially different interest rate environment than currently expected. Management evaluates a base case net interest income under an unchanged interest rate environment and what is believed to be the most likely balance sheet structure. This base case net interest income is then evaluated against non-parallel interest rate scenarios that increase and decrease 200 basis points in a linear fashion from the base case over 12 months, resulting in an average change in interest rates of 100 basis points over the period. Due to the current low level of interest rates, the analysis reflects a declining interest rate scenario of a 25 basis point drop, to zero percent. In addition, consistent with each interest rate scenario, adjustments are made to assumptions regarding asset prepayment levels, yield curves, and overall balance sheet mix and growth. The impact of these assumptions on the balance sheet is based on historical experience. These assumptions are inherently uncertain and, as a result, the model may not precisely predict the impact of higher or lower interest rates on net interest income. Actual results may differ from simulated results due to timing, magnitude and frequency of changes in interest rates, market conditions and management strategies, among other factors. However, the model can indicate the likely direction of change. Existing derivative instruments entered into for risk management purposes are included in the analysis, but no additional hedging is forecasted.

The table below, as of March 31, 2013 and December 31, 2012, 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. The sensitivity from December 31, 2012 to March 31, 2013 increased primarily due to higher forecasted core deposits, though risk to declining interest rates is limited by the current low level of rates.

Sensitivity of Net Interest Income to Changes in Interest Rates

	March 31, 2013					December 31, 2012
(in millions)	Amount			%		Amount			%
Change in Interest Rates:
+200 basis points	$	181		11	%	$	178		11	%
-25 basis points (to zero percent)	(24		)	(1	)	(23		)	(1	)

Corporate policy limits adverse change to no more than four percent of management's base case net interest income forecast, and the Corporation was within this policy guideline at March 31, 2013. Interest rate risk is actively managed principally through the use of either on-balance sheet financial instruments or interest rate derivatives to achieve the desired risk profile.

In addition to the simulation analysis, an economic value of equity analysis is performed for a longer term view of the interest rate risk position. The economic value of equity analysis begins with an estimate of the economic value of the financial assets, liabilities and off-balance sheet instruments on the Corporation's balance sheet, derived through discounting cash flows based on actual rates at the end of the period. Next, the estimated impact of rate movements is applied to the economic value of assets, liabilities and off-balance sheet instruments. The economic value of equity is then calculated as the difference between the estimated market value of assets and liabilities net of the impact of off-balance sheet instruments. As with net interest income simulation analysis, a variety of alternative scenarios are performed to measure the impact on economic value of equity, including changes in the level, slope and shape of the yield curve.

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The table below, as of March 31, 2013 and December 31, 2012, displays the estimated impact on the economic value of equity from a 200 basis point immediate parallel increase or decrease in interest rates. Similar to the simulation analysis above, due to the current low level of interest rates, the economic value of equity analyses below reflect an interest rate scenario of an immediate 25 basis point drop, to zero percent, while the rising interest rate scenario reflects an immediate 200 basis point rise. The change in the sensitivity of the economic value of equity to a 200 basis point parallel increase in rates between December 31, 2012 and March 31, 2013 was primarily driven by changes in market interest rates, a decrease in period-end noninterest-bearing deposits, and forecasted prepayments on the Corporation's mortgage-backed securities portfolio.

Sensitivity of Economic Value of Equity to Changes in Interest Rates

	March 31, 2013					December 31, 2012
(in millions)	Amount			%		Amount			%
Change in Interest Rates:
+200 basis points	$	824		8	%	$	1,031		10	%
-25 basis points (to zero percent)	(166		)	(2	)	(192		)	(2	)

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, 2013 included the ability to purchase federal funds, sell securities under agreements to repurchase, as well as issue deposits to institutional investors and issue certificates of deposit through brokers. Purchased funds totaled $453 million at March 31, 2013, compared to $612 million at December 31, 2012.

Comerica Bank (the Bank), a subsidiary of the Corporation, 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, 2013, $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, 2013, the Corporation had $2.0 billion of outstanding borrowings from the FHLB with maturities ranging from May 2013 to May 2014.

Additionally, the Bank had the ability to issue up to $15.0 billion of debt at March 31, 2013 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 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, 2013, 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, 2013	Rating	Outlook	Rating	Outlook
Standard and Poor’s	A-	Stable	A	Stable
Moody’s Investors Service	A3	Stable	A2	Stable
Fitch Ratings	A	Negative	A	Negative
DBRS	A	Stable	A (High)	Stable

The Corporation satisfies liquidity requirements with either liquid assets or various funding sources. Liquid assets, which totaled $13.0 billion at March 31, 2013, compared to $12.1 billion at December 31, 2012, 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, 2013, the Corporation held excess liquidity, represented by $4.6 billion deposited with the FRB, compared to $2.9 billion at December 31, 2012.

61

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 2012 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, 2012, 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-42 through F-47 in the Corporation's 2012 Annual Report. As of the date of this report, there have been no significant changes to the Corporation's critical accounting policies, except as discussed below.

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 loan losses includes specific allowances, based on individual evaluations of certain loans, and allowances for homogeneous pools of loans with similar risk characteristics.

The allowance for business loans which do not meet the criteria to be evaluated individually is determined by applying standard reserve factors to the pool of business loans within each internal risk rating. In the first quarter 2013, the Corporation enhanced the approach utilized for determining standard reserve factors by changing from a dollar-based migration method for developing probability of default statistics to a count-based method. Under the dollar-based method, each dollar that moved to default received equal weight in the determination of standard reserve factors for each internal risk rating. Under the count-based approach, each loan that moves to default receives equal weighting. The change resulted in a $40 million increase to the allowance for loan losses at March 31, 2013.

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

62

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, 2013			December 31, 2012
Tier 1 Common Capital Ratio:
Tier 1 capital (a) (b)	$	6,748		$	6,705
Less:
Trust preferred securities	—			—
Tier 1 common capital (b)	$	6,748		$	6,705
Risk-weighted assets (a) (b)	$	64,895		$	65,954
Tier 1 risk-based capital ratio (b)	10.40		%	10.17		%
Tier 1 common capital ratio (b)	10.40			10.17
Basel III Tier 1 and Tier 1 Common Capital Ratio:
Tier 1 and Tier 1 common capital (b)	$	6,748
Basel III proposed adjustments (c)	(410		)
Basel III Tier 1 and Tier 1 common capital (c)	$	6,338
Risk-weighted assets (a) (b)	$	64,895
Basel III proposed adjustments (c)	2,609
Basel III risk-weighted assets (c)	$	67,504
Tier 1 and Tier 1 common capital ratio (b)	10.4		%
Basel III Tier 1 and Tier 1 common capital ratio (c)	9.4		%
Tangible Common Equity Ratio:
Common shareholders' equity	$	6,988		$	6,942
Less:
Goodwill	635			635
Other intangible assets	21			22
Tangible common equity	$	6,332		$	6,285
Total assets	$	64,885		$	65,069
Less:
Goodwill	635			635
Other intangible assets	21			22
Tangible assets	$	64,229		$	64,412
Common equity ratio	10.77		%	10.67		%
Tangible common equity ratio	9.86			9.76
Tangible Common Equity per Share of Common Stock:
Common shareholders' equity	$	6,988		$	6,942
Tangible common equity	6,332			6,285
Shares of common stock outstanding (in millions)	187			188
Common shareholders' equity per share of common stock	$	37.38		$	36.87
Tangible common equity per share of common stock	33.87			33.38

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

(b) March 31, 2013 Tier 1 capital and risk-weighted-assets are estimated.

(c) March 31, 2013 Basel III Tier 1 common capital and risk-weighted assets are estimated based on the proposed rules for the U.S. adoption of the Basel III regulatory capital framework issued in June 2012, as fully phased in on January 1, 2019.

The Tier 1 common capital ratio removes qualifying trust preferred securities from Tier 1 capital as defined by and calculated in conformity with bank regulations. The Basel III Tier 1 common capital ratio further adjusts Tier 1 common capital and risk-weighted assets to account for the rules proposed by U.S. banking regulators in June 2012 for the U.S. adoption of the Basel III regulatory capital framework. 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.

63

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, 2012 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.

64

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†	Comerica Incorporated 2006 Amended and Restated Long-Term Incentive Plan (filed as Exhibit 10.1 to Registrant's Current Report on Form 8-K dated April 23, 2013, 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, 2013, 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.

65

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, 2013

66

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†	Comerica Incorporated 2006 Amended and Restated Long-Term Incentive Plan (filed as Exhibit 10.1 to Registrant's Current Report on Form 8-K dated April 23, 2013, 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, 2013, 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.

67

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, 2013 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, 2013	/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, 2013 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, 2013	/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, 2013 (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, 2013	/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

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, 2013		Dec. 31, 2012
Cash and due from banks	$ 877		$ 1,395
Federal funds sold	0		100
Interest-bearing deposits with banks	4,720		3,039
Total loans, net of allowance for loan losses	44,450		45,428
Demand deposits (noninterest-bearing)	22,777		23,279
Customer certificates of deposit	5,753		5,531
Total deposits	52,117		52,191
Short-term borrowings	58		110
Medium- and long-term debt	4,699		4,720
Fair value assets measured on nonrecurring basis impaired loans	205		214
Fair value assets measured on nonrecurring basis nonmarketable equity securities	2		2
Carrying Amount [Member]
Cash and due from banks	877		1,395
Federal funds sold			100
Interest-bearing deposits with banks	4,720		3,039
Loans held-for-sale	12		12
Total loans, net of allowance for loan losses	44,450	[1]	45,428	[1]
Customers' liability on acceptances outstanding	13		18
Nonmarketable equity securities	13	[2]	13	[2]
Restricted equity investments	174		174
Demand deposits (noninterest-bearing)	22,777		23,279
Interest-bearing deposits	23,587		23,381
Customer certificates of deposit	5,753		5,531
Total deposits	52,117		52,191
Short-term borrowings	58		110
Acceptances outstanding	13		18
Medium- and long-term debt	4,699		4,720
Credit-related financial instruments	(104)		(103)
Estimated Fair Value [Member]
Cash and due from banks	877		1,395
Federal funds sold			100
Interest-bearing deposits with banks	4,720		3,039
Loans held-for-sale	12		12
Total loans, net of allowance for loan losses	44,622	[1]	45,649	[1]
Customers' liability on acceptances outstanding	13		18
Nonmarketable equity securities	20	[2]	22	[2]
Restricted equity investments	174		174
Demand deposits (noninterest-bearing)	22,777		23,279
Interest-bearing deposits	23,587		23,381
Customer certificates of deposit	5,755		5,535
Total deposits	52,119		52,195
Short-term borrowings	58		110
Acceptances outstanding	13		18
Medium- and long-term debt	4,702		4,685
Credit-related financial instruments	(104)		(103)
Level 1
Cash and due from banks	877		1,395
Federal funds sold			100
Interest-bearing deposits with banks	4,720		3,039
Loans held-for-sale	0		0
Total loans, net of allowance for loan losses	0	[1]	0	[1]
Customers' liability on acceptances outstanding	13		18
Nonmarketable equity securities	0	[2]	0	[2]
Restricted equity investments	174		174
Demand deposits (noninterest-bearing)	0		0
Interest-bearing deposits	0		0
Customer certificates of deposit	0		0
Total deposits	0		0
Short-term borrowings	58		110
Acceptances outstanding	13		18
Medium- and long-term debt	0		0
Credit-related financial instruments	0		0
Level 2
Cash and due from banks	0		0
Federal funds sold			0
Interest-bearing deposits with banks	0		0
Loans held-for-sale	12		12
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)	22,777		23,279
Interest-bearing deposits	23,587		23,381
Customer certificates of deposit	5,755		5,535
Total deposits	52,119		52,195
Short-term borrowings	0		0
Acceptances outstanding	0		0
Medium- and long-term debt	4,702		4,685
Credit-related financial instruments	0		0
Level 3
Cash and due from banks	0		0
Federal funds sold			0
Interest-bearing deposits with banks	0		0
Loans held-for-sale	0		0
Total loans, net of allowance for loan losses	44,622	[1]	45,649	[1]
Customers' liability on acceptances outstanding	0		0
Nonmarketable equity securities	20	[2]	22	[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	$ (104)		$ (103)

[1] Included $205 million and $214 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012, respectively.

[2] Included $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at both March 31, 2013 and December 31, 2012.

XML

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, 2013		Mar. 31, 2012
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	$ 77		$ 187
Subsequent default on loans modified	21		27
Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	4		32
Subsequent default on loans modified	0		4
AB Note Restructures
Financing Receivable, Modifications [Line Items]
Balance	30		33
Subsequent default on loans modified	0		0
Business loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	66		184
Subsequent default on loans modified	21		27
Business loans | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	2		23
Subsequent default on loans modified	0		3
Business loans | Commercial | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	12		92
Subsequent default on loans modified	1		12
Business loans | Commercial | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	0		1
Subsequent default on loans modified	0		1
Business loans | Real estate construction | Commercial Real Estate business line | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	1	[1]	0	[1]
Subsequent default on loans modified	0	[1]	0	[1]
Business loans | Real estate construction | Commercial Real Estate business line | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	0	[1]	1	[1]
Subsequent default on loans modified	0	[1]	0	[1]
Business loans | Commercial mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	53		92
Subsequent default on loans modified	20		15
Business loans | Commercial mortgage | Commercial Real Estate business line | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	36	[1]	53	[1]
Subsequent default on loans modified	16	[1]	7	[1]
Business loans | Commercial mortgage | Other business lines | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	17	[2]	39	[2]
Subsequent default on loans modified	4	[2]	8	[2]
Business loans | Commercial mortgage | Other business lines | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	2	[2]	18	[2]
Subsequent default on loans modified	0	[2]	2	[2]
Business loans | Lease financing | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	0		3
Subsequent default on loans modified	0		0
Retail loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	11		3
Subsequent default on loans modified	0		0
Retail loans | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	2		9
Subsequent default on loans modified	0		1
Retail loans | Residential mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	5	[3]	0
Subsequent default on loans modified	0		0
Retail loans | Residential mortgage | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	1		9
Subsequent default on loans modified	0		1
Retail loans | Consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	6		3
Subsequent default on loans modified	0		0
Retail loans | Consumer | Home equity | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	4	[3]	0
Subsequent default on loans modified	0		0
Retail loans | Consumer | Other consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	2	[3]	3
Subsequent default on loans modified	0		0
Retail loans | Consumer | Other consumer | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	1		0
Subsequent default on loans modified	$ 0		$ 0

[1] Primarily loans to real estate investors and 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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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, 2013		Dec. 31, 2012
Nonaccrual loans	$ 494		$ 519
Reduced-rate loans	21	[1]	22	[1]
Total nonperforming loans	515		541
Foreclosed property	40		54
Total nonperforming assets	555		595
Retail loans
Nonaccrual loans	95		105
Reduced-rate loans	15		16
Business loans
Nonaccrual loans	399		414
Reduced-rate loans	$ 6		$ 6

[1] Reduced-rate business loans totaled $6 million at both March 31, 2013 and December 31, 2012, respectively, and reduced-rate retail loans totaled $15 million and $16 million, at March 31, 2013 and December 31, 2012, respectively.

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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, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Net periodic defined benefit cost	$ 21	$ 19
Defined Benefit Pension Plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	8
Interest cost	19	19
Expected return on plan assets	(33)	(28)
Amortization of prior service cost (credit)	1	1
Amortization of net loss	19	13
Net periodic defined benefit cost	15	13
Defined Benefit Pension Plans | Non-Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	3	2
Amortization of net loss	2	2
Net periodic defined benefit cost	6	5
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Amortization of transition obligations	0	1
Net periodic defined benefit cost	$ 0	$ 1

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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, 2013	Dec. 31, 2012
Credit Quality And Allowance For Credit Losses [Abstract]
Carrying amount PCI loans	$ 29	$ 36
Outstanding balance	$ 125	$ 138

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Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	$ 151		$ 114
60-89 days past due and still accruing	18		44
90 days or more past due and still accruing	25		23
Total past due loans and still accruing	194		181
Nonaccrual loans	494		519
Current loans	44,379	[1]	45,357	[1]
Total loans	45,067		46,057
Carrying amount PCI loans	29		36
Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	125		74
60-89 days past due and still accruing	11		32
90 days or more past due and still accruing	17		16
Total past due loans and still accruing	153		122
Nonaccrual loans	399		414
Current loans	40,791	[1]	41,841	[1]
Total loans	41,343		42,377
Business loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	46		23
60-89 days past due and still accruing	9		19
90 days or more past due and still accruing	2		5
Total past due loans and still accruing	57		47
Nonaccrual loans	102		103
Current loans	28,349	[1]	29,363	[1]
Total loans	28,508		29,513
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 past due loans and still accruing	0		0
Nonaccrual loans	33		33
Current loans	1,363	[1]	1,207	[1]
Total loans	1,396		1,240
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 past due loans and still accruing	0	[2]	0	[2]
Nonaccrual loans	30	[2]	30	[2]
Current loans	1,155	[1],[2]	1,019	[1],[2]
Total loans	1,185	[2]	1,049	[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 past due loans and still accruing	0	[3]	0	[3]
Nonaccrual loans	3	[3]	3	[3]
Current loans	208	[1],[3]	188	[1],[3]
Total loans	211	[3]	191	[3]
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	78		47
60-89 days past due and still accruing	2		13
90 days or more past due and still accruing	15		8
Total past due loans and still accruing	95		68
Nonaccrual loans	264		275
Current loans	8,958	[1]	9,129	[1]
Total loans	9,317		9,472
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	14	[2]	20	[2]
60-89 days past due and still accruing	0	[2]	4	[2]
90 days or more past due and still accruing	6	[2]	0	[2]
Total past due loans and still accruing	20	[2]	24	[2]
Nonaccrual loans	86	[2]	94	[2]
Current loans	1,706	[1],[2]	1,755	[1],[2]
Total loans	1,812	[2]	1,873	[2]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	64	[3]	27	[3]
60-89 days past due and still accruing	2	[3]	9	[3]
90 days or more past due and still accruing	9	[3]	8	[3]
Total past due loans and still accruing	75	[3]	44	[3]
Nonaccrual loans	178	[3]	181	[3]
Current loans	7,252	[1],[3]	7,374	[1],[3]
Total loans	7,505	[3]	7,599	[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 past due loans and still accruing	0		0
Nonaccrual loans	0		3
Current loans	853	[1]	856	[1]
Total loans	853		859
Business loans | International
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	1		4
60-89 days past due and still accruing	0		0
90 days or more past due and still accruing	0		3
Total past due loans and still accruing	1		7
Nonaccrual loans	0		0
Current loans	1,268	[1]	1,286	[1]
Total loans	1,269		1,293
Retail loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	26		40
60-89 days past due and still accruing	7		12
90 days or more past due and still accruing	8		7
Total past due loans and still accruing	41		59
Nonaccrual loans	95		105
Current loans	3,588	[1]	3,516	[1]
Total loans	3,724		3,680
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	15		27
60-89 days past due and still accruing	3		6
90 days or more past due and still accruing	3		2
Total past due loans and still accruing	21		35
Nonaccrual loans	65		70
Current loans	1,482	[1]	1,422	[1]
Total loans	1,568		1,527
Retail loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	11		13
60-89 days past due and still accruing	4		6
90 days or more past due and still accruing	5		5
Total past due loans and still accruing	20		24
Nonaccrual loans	30		35
Current loans	2,106	[1]	2,094	[1]
Total loans	2,156		2,153
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	4		9
60-89 days past due and still accruing	3		3
90 days or more past due and still accruing	0		0
Total past due loans and still accruing	7		12
Nonaccrual loans	28		31
Current loans	1,463	[1]	1,494	[1]
Total loans	1,498		1,537
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	7		4
60-89 days past due and still accruing	1		3
90 days or more past due and still accruing	5		5
Total past due loans and still accruing	13		12
Nonaccrual loans	2		4
Current loans	643	[1]	600	[1]
Total loans	$ 658		$ 616

[1] Included purchased credit-impaired (PCI) loans with a total carrying value of $29 million and $36 million at March 31, 2013 and December 31, 2012, respectively.

[2] Primarily loans to real estate investors and developers.

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

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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Accounting Policies [Abstract]
Increase in Allowance due to Enhancements in Methodology	$ 40

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Business Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2013 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 (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Fair value of securities pledged as collateral for derivative assets	$ 75,000,000
Cash pledged as collateral for derivative assets	83,000,000
Available-for-sale Securities Pledged as Collateral	3,000,000,000
Aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	48,000,000
Collateral pledged for aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	33,000,000
Additional required overnight collateral on derivatives with credit-risk contingent features at period end should the credit-risk contingent features be triggered	15,000,000
Net interest income generated by risk management fair value interest rate swaps	18,000,000	17,000,000
Allowance for credit losses on lending-related commitments	36,000,000		32,000,000
Allowance for credit losses on lending-related commitments, unused commitments to extend credit	20,000,000		19,000,000
Latest year of contract expiration on standby and commercial letters of credit	2022
Risk participation agreements covering standby and commercial letters of credit	319,000,000		325,000,000
Standby and commercial letters of credit	5,000,000,000		5,100,000,000
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities	82,000,000		82,000,000
Deferred fees	66,000,000		69,000,000
Allowance for credit losses on lending-related commitments, standby and commercial letters of credit	16,000,000		13,000,000
Notional Amount of Derivative Credit Risk Participation Agreements	594,000,000		574,000,000
Maximum estimated exposure to credit risk participation agreements assuming 100% default	10,000,000		11,000,000
Weighted average remaining maturity of credit risk participation agreements, in years	2 years 8 months 9 days
Notional amount of the derivative contract equivalent to Visa Class B shares	780,000
Derivative Liability, Fair Value, Gross Liability	359,000,000		408,000,000
Indemnification Agreement [Member]
Derivative Liability, Fair Value, Gross Liability	1,000,000		1,000,000
Sterling [Member]
Allowance for credit losses on lending-related commitments	0		0
Remaining fair value adjustment for unfunded commitments and letters of credit	2,000,000		2,000,000
Derivative Financial Instruments, Liabilities [Member]
Available-for-sale Securities Pledged as Collateral	45,000,000
Cash Pledged as Collateral	$ 3,000,000

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Income Taxes And Tax-Related Items Income Taxes And Tax-Related Items (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 42	$ 21
Change in unrecognized tax benefits	21
Reasonably possible change in unrecognized tax benefits in next 12 months	30
Tax-related interest payable/(receivable)	4	(7)
Change in tax-related interest payable/(receivable)	$ 11

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Credit Quality And Allowance For Credit Losses (Tables)

3 Months Ended

Mar. 31, 2013

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, 2013
Business loans:
Commercial	$	46	$	9	$	2	$	57	$	102	$	28,349	$	28,508
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		30		1,155		1,185
Other business lines (b)	—		—		—		—		3		208		211
Total real estate construction	—		—		—		—		33		1,363		1,396
Commercial mortgage:
Commercial Real Estate business line (a)	14		—		6		20		86		1,706		1,812
Other business lines (b)	64		2		9		75		178		7,252		7,505
Total commercial mortgage	78		2		15		95		264		8,958		9,317
Lease financing	—		—		—		—		—		853		853
International	1		—		—		1		—		1,268		1,269
Total business loans	125		11		17		153		399		40,791		41,343
Retail loans:
Residential mortgage	15		3		3		21		65		1,482		1,568
Consumer:
Home equity	4		3		—		7		28		1,463		1,498
Other consumer	7		1		5		13		2		643		658
Total consumer	11		4		5		20		30		2,106		2,156
Total retail loans	26		7		8		41		95		3,588		3,724
Total loans	$	151	$	18	$	25	$	194	$	494	$	44,379	$	45,067
December 31, 2012
Business loans:
Commercial	$	23	$	19	$	5	$	47	$	103	$	29,363	$	29,513
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		30		1,019		1,049
Other business lines (b)	—		—		—		—		3		188		191
Total real estate construction	—		—		—		—		33		1,207		1,240
Commercial mortgage:
Commercial Real Estate business line (a)	20		4		—		24		94		1,755		1,873
Other business lines (b)	27		9		8		44		181		7,374		7,599
Total commercial mortgage	47		13		8		68		275		9,129		9,472
Lease financing	—		—		—		—		3		856		859
International	4		—		3		7		—		1,286		1,293
Total business loans	74		32		16		122		414		41,841		42,377
Retail loans:
Residential mortgage	27		6		2		35		70		1,422		1,527
Consumer:
Home equity	9		3		—		12		31		1,494		1,537
Other consumer	4		3		5		12		4		600		616
Total consumer	13		6		5		24		35		2,094		2,153
Total retail loans	40		12		7		59		105		3,516		3,680
Total loans	$	114	$	44	$	23	$	181	$	519	$	45,357	$	46,057

(a) Primarily loans to real estate investors and developers.

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

(c) Included purchased credit-impaired (PCI) loans with a total carrying value of $29 million and $36 million at March 31, 2013 and December 31, 2012, respectively.

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, 2013
Business loans:
Commercial	$	26,875	$	881	$	650	$	102	$	28,508
Real estate construction:
Commercial Real Estate business line (e)	1,058		80		17		30		1,185
Other business lines (f)	198		2		8		3		211
Total real estate construction	1,256		82		25		33		1,396
Commercial mortgage:
Commercial Real Estate business line (e)	1,457		179		90		86		1,812
Other business lines (f)	6,741		232		354		178		7,505
Total commercial mortgage	8,198		411		444		264		9,317
Lease financing	843		8		2		—		853
International	1,220		48		1		—		1,269
Total business loans	38,392		1,430		1,122		399		41,343
Retail loans:
Residential mortgage	1,487		9		7		65		1,568
Consumer:
Home equity	1,457		7		6		28		1,498
Other consumer	622		23		11		2		658
Total consumer	2,079		30		17		30		2,156
Total retail loans	3,566		39		24		95		3,724
Total loans	$	41,958	$	1,469	$	1,146	$	494	$	45,067
December 31, 2012
Business loans:
Commercial	$	28,032	$	820	$	558	$	103	$	29,513
Real estate construction:
Commercial Real Estate business line (e)	921		77		21		30		1,049
Other business lines (f)	176		3		9		3		191
Total real estate construction	1,097		80		30		33		1,240
Commercial mortgage:
Commercial Real Estate business line (e)	1,479		213		87		94		1,873
Other business lines (f)	6,783		258		377		181		7,599
Total commercial mortgage	8,262		471		464		275		9,472
Lease financing	840		9		7		3		859
International	1,230		57		6		—		1,293
Total business loans	39,461		1,437		1,065		414		42,377
Retail loans:
Residential mortgage	1,438		12		7		70		1,527
Consumer:
Home equity	1,489		11		6		31		1,537
Other consumer	581		22		9		4		616
Total consumer	2,070		33		15		35		2,153
Total retail loans	3,508		45		22		105		3,680
Total loans	$	42,969	$	1,482	$	1,087	$	519	$	46,057

(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. Included in the special mention category were $210 million and $303 million at March 31, 2013 and December 31, 2012, respectively, of loans proactively monitored by management that were considered “pass” by regulatory authorities.

(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 - Summary of Significant Accounting Policies - on page F-59 in the Corporation's 2012 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 investors and 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, 2013		December 31, 2012
Nonaccrual loans	$	494	$	519
Reduced-rate loans (a)	21		22
Total nonperforming loans	515		541
Foreclosed property	40		54
Total nonperforming assets	$	555	$	595

(a) Reduced-rate business loans totaled $6 million at both March 31, 2013 and December 31, 2012, respectively, and reduced-rate retail loans totaled $15 million and $16 million, at March 31, 2013 and December 31, 2012, 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.

	2013									2012
(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	$	552		$	77		$	629		$	648		$	78		$	726
Loan charge-offs	(34		)	(4		)	(38		)	(55		)	(7		)	(62		)
Recoveries on loans previously charged-off	12			2			14			14			3			17
Net loan charge-offs	(22		)	(2		)	(24		)	(41		)	(4		)	(45		)
Provision for loan losses	14			(2		)	12			25			(2		)	23
Balance at end of period	$	544		$	73		$	617		$	632		$	72		$	704
As a percentage of total loans	1.32		%	1.97		%	1.37		%	1.61		%	1.94		%	1.64		%
March 31
Allowance for loan losses:
Individually evaluated for impairment	$	60		$	—		$	60		$	143		$	1		$	144
Collectively evaluated for impairment	484			73			557			489			71			560
Total allowance for loan losses	$	544		$	73		$	617		$	632		$	72		$	704
Loans:
Individually evaluated for impairment	$	355		$	42		$	397		$	702		$	50		$	752
Collectively evaluated for impairment	40,964			3,677			44,641			38,523			3,665			42,188
PCI loans (a)	24			5			29			64			8			72
Total loans evaluated for impairment	$	41,343		$	3,724		$	45,067		$	39,289		$	3,723		$	43,012

(a)    No allowance for loan losses was required for PCI loans at March 31, 2013 and 2012.

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)	2013		2012
Balance at beginning of period	$	32	$	26
Provision for credit losses on lending-related commitments	4		(1		)
Balance at end of period	$	36	$	25

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, 2013
Business loans:
Commercial	$	11	$	98	$	109	$	201	$	22
Real estate construction:
Commercial Real Estate business line (a)	—		28		28		41		4
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		28		28		42		4
Commercial mortgage:
Commercial Real Estate business line (a)	4		89		93		151		12
Other business lines (b)	5		120		125		174		22
Total commercial mortgage	9		209		218		325		34
Lease financing	—		—		—		—		—
Total business loans	20		335		355		568		60
Retail loans:
Residential mortgage	34		—		34		40		—
Consumer:
Home equity	4		—		4		6		—
Other consumer	4		—		4		10		—
Total consumer	8		—		8		16		—
Total retail loans (c)	42		—		42		56		—
Total individually evaluated impaired loans	$	62	$	335	$	397	$	624	$	60
December 31, 2012
Business loans:
Commercial	$	2	$	117	$	119	$	207	$	26
Real estate construction:
Commercial Real Estate business line (a)	—		26		26		31		4
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		26		26		32		4
Commercial mortgage:
Commercial Real Estate business line (a)	—		99		99		159		18
Other business lines (b)	—		122		122		167		28
Total commercial mortgage	—		221		221		326		46
Lease financing	—		2		2		5		—
International	—		—		—		—		—
Total business loans	2		366		368		570		76
Retail loans:
Residential mortgage	39		—		39		48		—
Consumer:
Home equity	8		—		8		10		—
Other consumer	4		—		4		10		—
Total consumer	12		—		12		20		—
Total retail loans (c)	51		—		51		68		—
Total individually evaluated impaired loans	$	53	$	366	$	419	$	638	$	76

(a) Primarily loans to real estate investors and 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.

	2013				2012
(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	$	114	$	1	$	236	$	1
Real estate construction:
Commercial Real Estate business line (a)	27		—		85		—
Other business lines (b)	—		—		5		—
Total real estate construction	27		—		90		—
Commercial mortgage:
Commercial Real Estate business line (a)	96		—		163		—
Other business lines (b)	124		—		212		1
Total commercial mortgage	220		—		375		1
Lease financing	1		—		3		—
International	—		—		6		—
Total business loans	362		1		710		2
Retail loans:
Residential mortgage	37		—		44		—
Consumer:
Home equity	6		—		3		—
Other consumer	4		—		4		—
Total consumer	10		—		7		—
Total retail loans	47		—		51		—
Total individually evaluated impaired loans	$	409	$	1	$	761	$	2

(a) Primarily loans to real estate investors and 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, 2013 and 2012 of loans considered to be TDRs that were restructured during the three months ended March 31, 2013 and 2012, 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.

	2013							2012
	Type of Modification							Type of Modification
(in millions)	Principal Deferrals (a)			AB Note Restructures (b)		Total Modifications		Principal Deferrals (a)		AB Note Restructures (b)		Total Modifications
Three Months Ended March 31
Business loans:
Commercial	$	7		$	—	$	7	$	21	$	—	$	21
Commercial mortgage:
Commercial Real Estate business line (c)	16			—		16		24		6		30
Other business lines (d)	6			11		17		9		—		9
Total commercial mortgage	22			11		33		33		6		39
Total business loans	29			11		40		54		6		60
Retail loans:
Residential mortgage	1		(e)	—		1		—		—		—
Consumer:
Home equity	1		(e)	—		1		—		—		—
Other consumer	1		(e)	—		1		—		—		—
Total consumer	2			—		2		—		—		—
Total retail loans	3			—		3		—		—		—
Total loans	$	32		$	11	$	43	$	54	$	6	$	60

(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 investors and 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, 2013 and 2012 of loans modified by principal deferral during the twelve months ended March 31, 2013 and 2012, and those principal deferrals which experienced a subsequent default during the three months ended March 31, 2013 and 2012. 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.

	2013					2012
(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	$	12		$	1	$	92	$	12
Real estate construction:
Commercial Real Estate business line (a)	1			—		—		—
Commercial mortgage:
Commercial Real Estate business line (a)	36			16		53		7
Other business lines (b)	17			4		39		8
Total commercial mortgage	53			20		92		15
Total business loans	66			21		184		27
Retail loans:
Residential mortgage	5		(c)	—		—		—
Consumer:
Home equity	4		(c)	—		—		—
Other consumer	2		(c)	—		3		—
Total consumer	6			—		3		—
Total retail loans	11			—		3		—
Total principal deferrals	$	77		$	21	$	187	$	27

(a) Primarily loans to real estate investors and 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.

The following table presents information regarding the recorded balance at March 31, 2013 and 2012 of loans modified by interest rate reduction during the twelve months ended March 31, 2013 and 2012, and those reduced-rate loans which experienced a subsequent default during the three months ended March 31, 2013 and 2012. For reduced-rate loans, a subsequent payment default is defined in terms of delinquency, when a principal or interest payment is 90 days past due.

	2013				2012
(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
Interest rate reductions:
Business loans:
Commercial	$	—	$	—	$	1	$	1
Real estate construction:
Commercial Real Estate business line (a)	—		—		1		—
Commercial mortgage:
Other business lines (b)	2		—		18		2
Lease financing	—		—		3		—
Total business loans	2		—		23		3
Retail loans:
Residential mortgage	1		—		9		1
Consumer:
Other consumer	1		—		—		—
Total retail loans	2		—		9		1
Total interest rate reductions	$	4	$	—	$	32	$	4

(a) Primarily loans to real estate investors and developers.

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

During the twelve months ended March 31, 2013 and 2012 loans with a carrying value of $30 million and $33 million at March 31, 2013 and 2012, respectively, were restructured into two notes (AB note restructures). For 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 AB note restructures during both the three-month periods ended March 31, 2013 and 2012.

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, 2013 and December 31, 2012 were as follows. The outstanding balance represents the total amount owed as of March 31, 2013 and December 31, 2012, including accrued but unpaid interest and any amounts previously charged off. No allowance for loan losses was required on the acquired PCI loan pools at both March 31, 2013 and December 31, 2012.

(in millions)	March 31, 2013		December 31, 2012
Acquired PCI loans:
Carrying amount	$	29	$	36
Outstanding balance	125		138

Accretable Yield For Acquired Purchased Credit-Impaired Loans

Changes in the accretable yield for acquired PCI loans for the three months ended March 31, 2013 and 2012 were as follows.

	Three Months Ended March 31,
(in millions)	2013			2012
Balance at beginning of period	$	16		$	25
Accretion	(4		)	(5		)
Balance at end of period	$	12		$	20

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Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Credit Losses On Lending-Related Commitments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ 16	$ 22
Loan Origination Commitments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	32	26
Provision for credit losses	4	(1)
Balance at end of period	$ 36	$ 25

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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, 2013		Dec. 31, 2012
Temporarily Impaired Less than 12 months, Fair Value	$ 233		$ 0
Temporarily Impaired Less than 12 months, Unrealized Losses	1		0
Temporarily Impaired 12 months or more, Fair Value	177		180
Temporarily Impaired 12 months or more, Unrealized Losses	10		11
Temporarily Impaired Total, Fair Value	410		180
Temporarily Impaired Total, Unrealized Losses	11		11
Residential Mortgage-Backed Securities [Member]
Temporarily Impaired Less than 12 months, Fair Value	233	[1]
Temporarily Impaired Less than 12 months, Unrealized Losses	1	[1]
Temporarily Impaired 12 months or more, Fair Value	0	[1]
Temporarily Impaired 12 months or more, Unrealized Losses	0	[1]
Temporarily Impaired Total, Fair Value	233	[1]
Temporarily Impaired Total, Unrealized Losses	1	[1]
State And Municipal Securities [Member]
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]	23	[2]
Temporarily Impaired 12 months or more, Unrealized Losses	4	[2]	4	[2]
Temporarily Impaired Total, Fair Value	23	[2]	23	[2]
Temporarily Impaired Total, Unrealized Losses	4	[2]	4	[2]
Auction-Rate Debt Securities [Member]
Temporarily Impaired Less than 12 months, Fair Value	0		0
Temporarily Impaired Less than 12 months, Unrealized Losses	0		0
Temporarily Impaired 12 months or more, Fair Value	1		1
Temporarily Impaired 12 months or more, Unrealized Losses	0	[3]	0	[3]
Temporarily Impaired Total, Fair Value	1		1
Temporarily Impaired Total, Unrealized Losses	0	[3]	0	[3]
Auction-Rate Preferred Securities [Member]
Temporarily Impaired Less than 12 months, Fair Value	0		0
Temporarily Impaired Less than 12 months, Unrealized Losses	0		0
Temporarily Impaired 12 months or more, Fair Value	153		156
Temporarily Impaired 12 months or more, Unrealized Losses	6		7
Temporarily Impaired Total, Fair Value	153		156
Temporarily Impaired Total, Unrealized Losses	$ 6		$ 7

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

[2] Primarily auction-rate securities.

[3] Unrealized losses less than $0.5 million.

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Business Segment Information (Market Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Net interest income (expense) (FTE)	$ 416		$ 443
Provision for credit losses	16		22
Noninterest income	200		206
Noninterest expenses	416		448
Provision (benefit) for income taxes (FTE)	50		49
Net income (loss)	134		130
Net credit-related charge-offs	24		45
Assets, average	63,451		61,345
Loans, average	44,617		42,269
Deposits, average	50,692		48,311
Return on average assets	0.84%	[1]	0.85%	[1]
Efficiency ratio	67.58%	[2]	69.70%	[2]
Michigan
Net interest income (expense) (FTE)	189		196
Provision for credit losses	(8)		(3)
Noninterest income	92		98
Noninterest expenses	168		179
Provision (benefit) for income taxes (FTE)	44		40
Net income (loss)	77		78
Net credit-related charge-offs	5		18
Assets, average	14,042		14,092
Loans, average	13,650		13,829
Deposits, average	20,255		19,415
Return on average assets	1.45%	[1]	1.53%	[1]
Efficiency ratio	59.53%	[2]	60.88%	[2]
California
Net interest income (expense) (FTE)	171		165
Provision for credit losses	21		(3)
Noninterest income	35		33
Noninterest expenses	97		99
Provision (benefit) for income taxes (FTE)	32		38
Net income (loss)	56		64
Net credit-related charge-offs	10		11
Assets, average	13,795		12,310
Loans, average	13,542		12,096
Deposits, average	14,356		13,688
Return on average assets	1.45%	[1]	1.74%	[1]
Efficiency ratio	47.04%	[2]	50.50%	[2]
Texas
Net interest income (expense) (FTE)	135		150
Provision for credit losses	8		25
Noninterest income	31		31
Noninterest expenses	91		93
Provision (benefit) for income taxes (FTE)	23		22
Net income (loss)	44		41
Net credit-related charge-offs	6		7
Assets, average	10,795		10,080
Loans, average	10,071		9,295
Deposits, average	9,959		10,229
Return on average assets	1.53%	[1]	1.43%	[1]
Efficiency ratio	54.99%	[2]	51.10%	[2]
Other Markets
Net interest income (expense) (FTE)	81		76
Provision for credit losses	(1)		1
Noninterest income	25		26
Noninterest expenses	44		50
Provision (benefit) for income taxes (FTE)	7		5
Net income (loss)	56		46
Net credit-related charge-offs	3		9
Assets, average	7,859		7,505
Loans, average	7,354		7,049
Deposits, average	5,675		4,649
Return on average assets	2.85%	[1]	2.43%	[1]
Efficiency ratio	42.11%	[2]	51.93%	[2]
Finance & Other
Net interest income (expense) (FTE)	(160)		(144)
Provision for credit losses	(4)		2
Noninterest income	17		18
Noninterest expenses	16		27
Provision (benefit) for income taxes (FTE)	(56)		(56)
Net income (loss)	(99)		(99)
Net credit-related charge-offs	0		0
Assets, average	16,960		17,358
Loans, average	0		0
Deposits, average	$ 447		$ 330

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

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

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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) (Nonrecurring [Member], Level 3, USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 205	$ 214
Nonmarketable equity securities	2	2
Other real estate	20	24
Loan servicing rights	2	2
Total assets at fair value	229	242
Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	56	42
Real estate construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	27	25
Commercial mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	122	145
Lease financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		$ 2

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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, 2013		Mar. 31, 2012
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	$ 409		$ 761
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		2
Business loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	362		710
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		2
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	114		236
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	1		1
Business loans | Real estate construction
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	27		90
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		0
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	27	[1]	85	[1]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[1]	0	[1]
Business loans | Real estate construction | Other business lines
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	0	[2]	5	[2]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[2]	0	[2]
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	220		375
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0		1
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	96	[1]	163	[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	124	[2]	212	[2]
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	0	[2]	1	[2]
Business loans | Lease financing
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	1		3
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	0		6
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	47		51
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	37		44
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	10		7
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	6		3
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 investors and developers.

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

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Accumulated Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Investment securities, Balance	$ 139	$ 148	$ 150	$ 129
Investment securities, Net unrealized holding gains arising during the period	(18)	35
Investment securities, Provision for income taxes	(7)	13
Investment securities, Net unrealized holding gains arising during period, net of tax	(11)	22
Investment securities, Net realized gains included in net securities gains	0	5
Investment securities, Provision for income taxes	0	2
Investment securities, Reclassification adjustment for net securities gains included in net income, net of tax	0	3
Investment securities, Change in net unrealized gains on investment securities available-for-sale, net of tax	(11)	19
Benefit plans, Balance	(549)	(474)	(563)	(485)
Benefit plans, Net defined benefit pension and other postretirement adjustment arising during the period, net of tax	0	0
Less: Amortization of actuarial net loss	(21)	(15)
Less: Amortization of prior service cost	(1)	(1)
Less: Amortization of transition obligation	0	(1)
Benefit plans, Amounts recognized in emoloyee benefits	(22)	(17)
Benefit plans, Benefit for income taxes	(8)	(6)
Benefit plans, Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax	(14)	(11)
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax	14	11
Total accumulated other comprehensive loss at end of period, net of tax	$ (410)	$ (326)	$ (413)

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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, 2013	Dec. 31, 2012
Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	$ 28,370	$ 27,340
Commercial And Other [Member] | Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	26,683	25,659
Bankcard, Revolving Check Credit And Home Equity Loan Commitments [Member] | Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	1,687	1,681
Standby Letters Of Credit [Member]
Loss contingency, range of possible loss, maximum	4,908	4,985
Commercial Letters Of Credit [Member]
Loss contingency, range of possible loss, maximum	60	78
Other Credit-Related Financial Instruments [Member]
Loss contingency, estimate of possible loss	$ 1	$ 1

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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, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 45,067		$ 46,057
Special mention loans considered pass by regulatory authorities	210		303
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,958	[1]	42,969	[1]
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,469	[2]	1,482	[2]
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,146	[3]	1,087	[3]
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	494	[4]	519	[4]
Business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	41,343		42,377
Business loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	38,392	[1]	39,461	[1]
Business loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,430	[2]	1,437	[2]
Business loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,122	[3]	1,065	[3]
Business loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	399	[4]	414	[4]
Business loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	28,508		29,513
Business loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	26,875	[1]	28,032	[1]
Business loans | Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	881	[2]	820	[2]
Business loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	650	[3]	558	[3]
Business loans | Commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	102	[4]	103	[4]
Business loans | Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,396		1,240
Business loans | Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,256	[1]	1,097	[1]
Business loans | Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	82	[2]	80	[2]
Business loans | Real estate construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	25	[3]	30	[3]
Business loans | Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	33	[4]	33	[4]
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,185	[5]	1,049	[5]
Business loans | Real estate construction | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,058	[1],[5]	921	[1],[5]
Business loans | Real estate construction | Commercial Real Estate business line | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	80	[2],[5]	77	[2],[5]
Business loans | Real estate construction | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	17	[3],[5]	21	[3],[5]
Business loans | Real estate construction | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	30	[4],[5]	30	[4],[5]
Business loans | Real estate construction | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	211	[6]	191	[6]
Business loans | Real estate construction | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	198	[1],[6]	176	[1],[6]
Business loans | Real estate construction | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	[2],[6]	3	[2],[6]
Business loans | Real estate construction | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	8	[3],[6]	9	[3],[6]
Business loans | Real estate construction | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	3	[4],[6]	3	[4],[6]
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,317		9,472
Business loans | Commercial mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,198	[1]	8,262	[1]
Business loans | Commercial mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	411	[2]	471	[2]
Business loans | Commercial mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	444	[3]	464	[3]
Business loans | Commercial mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	264	[4]	275	[4]
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,812	[5]	1,873	[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,457	[1],[5]	1,479	[1],[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	179	[2],[5]	213	[2],[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	90	[3],[5]	87	[3],[5]
Business loans | Commercial mortgage | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	86	[4],[5]	94	[4],[5]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,505	[6]	7,599	[6]
Business loans | Commercial mortgage | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,741	[1],[6]	6,783	[1],[6]
Business loans | Commercial mortgage | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	232	[2],[6]	258	[2],[6]
Business loans | Commercial mortgage | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	354	[3],[6]	377	[3],[6]
Business loans | Commercial mortgage | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	178	[4],[6]	181	[4],[6]
Business loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans	853		859
Business loans | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	843	[1]	840	[1]
Business loans | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	8	[2]	9	[2]
Business loans | Lease financing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	[3]	7	[3]
Business loans | Lease financing | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[4]	3	[4]
Business loans | International
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,269		1,293
Business loans | International | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,220	[1]	1,230	[1]
Business loans | International | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	48	[2]	57	[2]
Business loans | International | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	1	[3]	6	[3]
Business loans | International | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[4]	0	[4]
Retail loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,724		3,680
Retail loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,566	[1]	3,508	[1]
Retail loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	39	[2]	45	[2]
Retail loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	24	[3]	22	[3]
Retail loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	95	[4]	105	[4]
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,568		1,527
Retail loans | Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,487	[1]	1,438	[1]
Retail loans | Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	9	[2]	12	[2]
Retail loans | Residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	7	[3]	7	[3]
Retail loans | Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	65	[4]	70	[4]
Retail loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,156		2,153
Retail loans | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,079	[1]	2,070	[1]
Retail loans | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	30	[2]	33	[2]
Retail loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	17	[3]	15	[3]
Retail loans | Consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	30	[4]	35	[4]
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	658		616
Retail loans | Consumer | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	622	[1]	581	[1]
Retail loans | Consumer | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	23	[2]	22	[2]
Retail loans | Consumer | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	11	[3]	9	[3]
Retail loans | Consumer | Other consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	2	[4]	4	[4]
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,498		1,537
Retail loans | Consumer | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,457	[1]	1,489	[1]
Retail loans | Consumer | Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	7	[2]	11	[2]
Retail loans | Consumer | Home equity | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	6	[3]	6	[3]
Retail loans | Consumer | Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 28	[4]	$ 31	[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. Included in the special mention category were $210 million and $303 million at March 31, 2013 and December 31, 2012, respectively, of loans proactively monitored by management that were considered “pass” by regulatory authorities.

[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 - Summary of Significant Accounting Policies - on page F-59 in the Corporation's 2012 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 investors and developers.

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

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Fair Value Measurements

3 Months Ended

Mar. 31, 2013

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 and investment securities, 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

Securities held for trading purposes 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 securities held for trading purposes 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. Securities classified as Level 3 include securities in less liquid markets and securities not rated by a credit agency. 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. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available or the market is deemed to be inactive at the measurement date, an adjustment to the quoted prices may be necessary. In some circumstances, the Corporation may conclude that a change in valuation technique or the use of multiple valuation techniques may be appropriate to estimate an instrument's fair value. 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, of which the substantial majority is auction-rate securities, represent securities in less liquid markets requiring significant management assumptions when determining fair value. 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. Additionally, as the discount rate incorporates the liquidity risk premium, a change in an assumption used for the liquidity risk premium would be accompanied by a directionally similar change in the discount rate. The Corporate Development Department 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 not recorded at fair value. 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 for its over-the-counter derivative positions on a counterparty-by-counterparty basis and 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.

The Corporation holds a portfolio of warrants for generally nonmarketable equity securities with a fair value of $3 million at March 31, 2013. These warrants are primarily from high technology, non-public companies obtained as part of the loan origination process. 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 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. 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 of $13 million at March 31, 2013. 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 17 years. The investments are accounted for 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 Corporation's percentage ownership in the net asset value of the entire fund, 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 $1 million and $2 million at March 31, 2013 and December 31, 2012, respectively.

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) 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 $89 million at both March 31, 2013 and December 31, 2012 and its investment in FRB stock totaled $85 million at both March 31, 2013 and December 31, 2012. 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. Other real estate carried at fair value based on an observable market price or a current appraised value is classified by the Corporation as Level 2. 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.

Loan servicing rights

Loan servicing rights with a carrying value of $2 million at March 31, 2013, included in “accrued income and other assets” on the consolidated balance sheets and primarily related to Small Business Administration loans, are subject to impairment testing. Loan servicing rights may be carried at fair value on a nonrecurring basis when impairment testing indicates that the fair value of the loan servicing rights is less than the recorded value. A valuation model is used for impairment testing on a quarterly basis, which utilizes a discounted cash flow model, using interest rates and prepayment speed assumptions currently quoted for comparable instruments and a discount rate determined by management. On a quarterly basis, the Accounting Department is responsible for performing the valuation procedures and updating significant inputs, which are primarily obtained from available third-party market data, with appropriate oversight and approval provided by senior management. If the valuation model reflects a value less than the carrying value, loan servicing rights are adjusted to fair value through a valuation allowance as determined by the model. As such, the Corporation classifies loan servicing rights 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 standby and commercial 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, 2013 and 2012.

(in millions)	Total		Level 1		Level 2		Level 3
March 31, 2013
Trading securities:
Deferred compensation plan assets	$	91	$	91	$	—	$	—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	7		—		7		—
Corporate debt securities	3		—		3		—
Total trading securities	104		91		13		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	20		20		—		—
Residential mortgage-backed securities (a)	9,913		—		9,913		—
State and municipal securities (b)	23		—		—		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	56		—		56		—
Equity and other non-debt securities:
Auction-rate preferred securities	153		—		—		153
Money market and other mutual funds	120		120		—		—
Total investment securities available-for-sale	10,286		140		9,969		177
Derivative assets:
Interest rate contracts	512		—		512		—
Energy derivative contracts	142		—		142		—
Foreign exchange contracts	22		—		22		—
Warrants	3		—		—		3
Total derivative assets	679		—		676		3
Total assets at fair value	$	11,069	$	231	$	10,658	$	180
Derivative liabilities:
Interest rate contracts	$	196	$	—	$	196	$	—
Energy derivative contracts	140		—		140		—
Foreign exchange contracts	23		—		23		—
Other	1		—		—		1
Total derivative liabilities	360		—		359		1
Deferred compensation plan liabilities	91		91		—		—
Total liabilities at fair value	$	451	$	91	$	359	$	1

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

(b) Primarily auction-rate securities.

(in millions)	Total		Level 1		Level 2		Level 3
December 31, 2012
Trading securities:
Deferred compensation plan assets	$	88	$	88	$	—	$	—
Residential mortgage-backed securities (a)	4		—		4		—
State and municipal securities	19		—		19		—
Corporate debt securities	3		—		3		—
Total trading securities	114		88		26		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	20		20		—		—
Residential mortgage-backed securities (a)	9,935		—		9,935		—
State and municipal securities (b)	23		—		—		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	57		—		57		—
Equity and other non-debt securities:
Auction-rate preferred securities	156		—		—		156
Money market and other mutual funds	105		105		—		—
Total investment securities available-for-sale	10,297		125		9,992		180
Derivative assets:
Interest rate contracts	556		—		556		—
Energy derivative contracts	173		—		173		—
Foreign exchange contracts	21		—		21		—
Warrants	3		—		—		3
Total derivative assets	753		—		750		3
Total assets at fair value	$	11,164	$	213	$	10,768	$	183
Derivative liabilities:
Interest rate contracts	$	218	$	—	$	218	$	—
Energy derivative contracts	172		—		172		—
Foreign exchange contracts	18		—		18		—
Other	1		—		—		1
Total derivative liabilities	409		—		408		1
Deferred compensation plan liabilities	88		88		—		—
Total liabilities at fair value	$	497	$	88	$	408	$	1

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

(b) Primarily 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, 2013 and 2012.

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, 2013 and 2012.

			Net Realized/Unrealized Gains (Losses)
	Balance  at Beginning of Period		Recorded in Earnings					Recorded in Other Comprehensive Income (Pretax)										Balance  at End of  Period
(in millions)			Realized			Unrealized						Sales			Settlements
Three Months Ended March 31, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—	$	—			$	—		$	—		$	23
Auction-rate debt securities	1		—			—		—				—			—			1
Auction-rate preferred securities	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
Three Months Ended March 31, 2012
Investment securities available-for-sale:
State and municipal securities (a)	$	24	$	—		$	—	$	(1	)	(b)	$	—		$	—		$	23
Auction-rate debt securities	1		—			—		—				—			—			1
Auction-rate preferred securities	408		5		(c)	—		4			(b)	(97		)	—			320
Total investment securities available-for-sale	433		5		(c)	—		3			(b)	(97		)	—			344
Derivative assets:
Warrants	3		1		(d)	—		—				(1		)	—			3
Derivative liabilities:
Other	6		—			—		—				—			(6		)	—

(a) Primarily 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 (losses)" 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, 2013 and December 31, 2012 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012.

(in millions)	Level 3
March 31, 2013
Loans:
Commercial	$	56
Real estate construction	27
Commercial mortgage	122
Total loans	205
Nonmarketable equity securities	2
Other real estate	20
Loan servicing rights	2
Total assets at fair value	$	229
December 31, 2012
Loans:
Commercial	$	42
Real estate construction	25
Commercial mortgage	145
Lease financing	2
Total loans	214
Nonmarketable equity securities	2
Other real estate	24
Loan servicing rights	2
Total assets at fair value	$	242

The following table presents quantitative information related to the significant unobservable inputs utilized in the Corporation's significant Level 3 recurring fair value measurement as of March 31, 2013 and December 31, 2012. The Corporation's significant 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.

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
March 31, 2013
State and municipal securities (a)	$	23	6% - 10%	4 - 6
Equity and other non-debt securities:
Auction-rate preferred securities	153		4% - 6%	2 - 5
December 31, 2012
State and municipal securities (a)	$	23	6% - 10%	4 - 6
Equity and other non-debt securities:
Auction-rate preferred securities	156		4% - 6%	2 - 4

(a) Primarily auction-rate securities.

Level 3 assets recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012 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.

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, 2013
Assets
Cash and due from banks	$	877		$	877		$	877	$	—	$	—
Interest-bearing deposits with banks	4,720			4,720			4,720		—		—
Loans held-for-sale	12			12			—		12		—
Total loans, net of allowance for loan losses (a)	44,450			44,622			—		—		44,622
Customers’ liability on acceptances outstanding	13			13			13		—		—
Nonmarketable equity securities (b)	13			20			—		—		20
Restricted equity investments	174			174			174		—		—
Liabilities
Demand deposits (noninterest-bearing)	22,777			22,777			—		22,777		—
Interest-bearing deposits	23,587			23,587			—		23,587		—
Customer certificates of deposit	5,753			5,755			—		5,755		—
Total deposits	52,117			52,119			—		52,119		—
Short-term borrowings	58			58			58		—		—
Acceptances outstanding	13			13			13		—		—
Medium- and long-term debt	4,699			4,702			—		4,702		—
Credit-related financial instruments	(104		)	(104		)	—		—		(104		)
December 31, 2012
Assets
Cash and due from banks	$	1,395		$	1,395		$	1,395	$	—	$	—
Federal funds sold	100			100			100		—		—
Interest-bearing deposits with banks	3,039			3,039			3,039		—		—
Loans held-for-sale	12			12			—		12		—
Total loans, net of allowance for loan losses (a)	45,428			45,649			—		—		45,649
Customers’ liability on acceptances outstanding	18			18			18		—		—
Nonmarketable equity securities (b)	13			22			—		—		22
Restricted equity investments	174			174			174		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,279			23,279			—		23,279		—
Interest-bearing deposits	23,381			23,381			—		23,381		—
Customer certificates of deposit	5,531			5,535			—		5,535		—
Total deposits	52,191			52,195			—		52,195		—
Short-term borrowings	110			110			110		—		—
Acceptances outstanding	18			18			18		—		—
Medium- and long-term debt	4,720			4,685			—		4,685		—
Credit-related financial instruments	(103		)	(103		)	—		—		(103		)

(a) Included $205 million and $214 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012, respectively.

(b) Included $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at both March 31, 2013 and December 31, 2012.

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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, 2013	Dec. 31, 2012
Derivative And Credit-Related Financial Instruments [Abstract]
Total watch list standby and commercial letters of credit	$ 142	$ 144
As a percentage of total outstanding standby and commercial letters of credit	2.90%	2.90%

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Investment Securities (Gains And Losses On Available-For-Sale Securities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Securities gains	$ 0	$ 5
Securities losses	$ 0	$ 0

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2013

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

Schedule Of Accumulated Other Comprehensive Income (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, 2013 and 2012, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Three Months Ended March 31,
(in millions)	2013			2012
Accumulated net unrealized gains on investment securities available-for-sale:
Balance at beginning of period, net of tax	$	150		$	129
Net unrealized holding gains (losses) arising during the period	(18		)	35
Less: Provision (benefit) for income taxes	(7		)	13
Net unrealized holding gains (losses) arising during the period, net of tax	(11		)	22
Less:
Net realized gains included in net securities gains	—			5
Less: Provision for income taxes	—			2
Reclassification adjustment for net securities gains included in net income, net of tax	—			3
Change in net unrealized gains on investment securities available-for-sale, net of tax	(11		)	19
Balance at end of period, net of tax	$	139		$	148
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(563	)	$	(485	)
Net defined benefit pension and other postretirement adjustment arising during the period, net of tax	—			—
Less:
Amortization of actuarial net loss	(21		)	(15		)
Amortization of prior service cost	(1		)	(1		)
Amortization of transition obligation	—			(1		)
Amounts recognized in employee benefits expense	(22		)	(17		)
Less: Benefit for income taxes	(8		)	(6		)
Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax	(14		)	(11		)
Change in defined benefit pension and other postretirement plans adjustment, net of tax	14			11
Balance at end of period, net of tax	$	(549	)	$	(474	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(410	)	$	(326	)

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Medium- And Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Schedule Of Medium- And Long-Term Debt

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

(in millions)	March 31, 2013		December 31, 2012
Parent company
Subordinated notes:
4.80% subordinated notes due 2015	$	327	$	330
Medium-term notes:
3.00% notes due 2015	299		299
Total parent company	626		629
Subsidiaries
Subordinated notes:
7.375% subordinated notes due 2013	50		51
5.70% subordinated notes due 2014	264		267
5.75% subordinated notes due 2016	691		694
5.20% subordinated notes due 2017	587		593
Floating-rate based on LIBOR index subordinated notes due 2018	26		26
8.375% subordinated notes due 2024	186		186
7.875% subordinated notes due 2026	236		241
Total subordinated notes	2,040		2,058
Federal Home Loan Bank advances:
Floating-rate based on LIBOR indices due 2013 to 2014	2,000		2,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	33		33
Total subsidiaries	4,073		4,091
Total medium- and long-term debt	$	4,699	$	4,720

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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, 2013	Mar. 31, 2012
Credit Quality And Allowance For Credit Losses [Abstract]
Balance at beginning of period	$ 16	$ 25
Accretion	(4)	(5)
Balance at end of period	$ 12	$ 20

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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Within one year, Amortized Cost	$ 81
After one year through five years, Amortized Cost	419
After five years through ten years, Amortized Cost	114
After ten years, Amortized Cost	9,174
Subtotal, Amortized Cost	9,788
Within one year, Fair Value	81
After one year through five years, Fair Value	425
After five years through ten years, Fair Value	113
After ten years, Fair Value	9,394
Subtotal, Fair Value	10,013
Total investment securities available-for-sale, Amortized Cost	10,067	10,060
Total investment securities available-for-sale, Fair Value	10,286	10,297
Auction-Rate Preferred Securities [Member]
Total investment securities available-for-sale, Amortized Cost	159	163
Total investment securities available-for-sale, Fair Value	153	156
Money Market And Other Mutual Funds [Member]
Total investment securities available-for-sale, Amortized Cost	120	105
Total investment securities available-for-sale, Fair Value	$ 120	$ 105

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Net Income Per Common Share (Tables)

3 Months Ended

Mar. 31, 2013

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)	2013		2012
Basic and diluted
Net income	$	134	$	130
Less:
Income allocated to participating securities	2		1
Net income attributable to common shares	$	132	$	129
Basic average common shares	185		195
Basic net income per common share	$	0.71	$	0.66
Basic average common shares	185		195
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	—		1
Net effect of the assumed exercise of warrants	2		—
Diluted average common shares	187		196
Diluted net income per common share	$	0.70	$	0.66

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

The following average shares related to outstanding options and warrants 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 and warrants were greater than the average market price of common shares for the period.

	Three Months Ended March 31,
(shares in millions)	2013	2012
Average outstanding options	15.1	17.6
Range of exercise prices	$34.78 - $61.94	$30.77 - $64.50
Average outstanding warrants		0.6
Exercise price		$30.36

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Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2013

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)	2013			2012
Service cost	$	9		$	8
Interest cost	19			19
Expected return on plan assets	(33		)	(28		)
Amortization of prior service cost	1			1
Amortization of net loss	19			13
Net periodic defined benefit cost	$	15		$	13

Non-Qualified Defined Benefit Pension Plan	Three Months Ended March 31,
(in millions)	2013		2012
Service cost	$	1	$	1
Interest cost	3		2
Amortization of net loss	2		2
Net periodic defined benefit cost	$	6	$	5

Postretirement Benefit Plan	Three Months Ended March 31,
(in millions)	2013			2012
Interest cost	$	1		$	1
Expected return on plan assets	(1		)	(1		)
Amortization of transition obligation	—			1
Net periodic postretirement benefit cost	$	—		$	1

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Basis of Presentation and Accounting Policies

3 Months Ended

Mar. 31, 2013

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, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. 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, 2012.

Allowance for Loan Losses

The allowance for loan losses represents management’s assessment of probable, estimable losses inherent in the Corporation’s loan portfolio. The allowance for loan losses includes specific allowances, based on individual evaluations of certain loans, and allowances for homogeneous pools of loans with similar risk characteristics.

The allowance for business loans which do not meet the criteria to be evaluated individually is determined by applying standard reserve factors to the pool of business loans within each internal risk rating. In the first quarter 2013, the Corporation enhanced the approach utilized for determining standard reserve factors by changing from a dollar-based migration method for developing probability of default statistics to a count-based method. Under the dollar-based method, each dollar that moved to default received equal weight in the determination of standard reserve factors for each internal risk rating. As a result, the movement of larger loans impacted standard reserve factors more than the movement of smaller loans. By moving to a count-based approach, where each loan that moves to default receives equal weighting, unusually large or small loans will not have a disproportionate influence on the standard reserve factors. The change resulted in a $40 million increase to the allowance for loan losses at March 31, 2013.

Recently Adopted Accounting Pronouncements

In the first quarter 2013, the Corporation adopted amendments to GAAP which require enhanced disclosures about the nature and effect or potential effect of an entity's rights of setoff associated with its derivative and certain other financial instruments. The required disclosures are provided in Note 5 to these unaudited financial statements.

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Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

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, 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	77			41			65			14			3			200
Noninterest expenses	146			175			79			3			13			416
Provision (benefit) for income taxes (FTE)	88			5			13			(58		)	2			50
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)	2.19		%	0.18		%	2.12		%	N/M			N/M			0.84		%
Efficiency ratio (b)	32.30			89.37			71.09			N/M			N/M			67.58

(Table continues on following page).

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Three Months Ended March 31, 2012
Earnings summary:
Net interest income (expense) (FTE)	$	373		$	167		$	47		$	(152	)	$	8		$	443
Provision for credit losses	2			6			12			—			2			22
Noninterest income	81			42			65			13			5			206
Noninterest expenses	158			183			80			3			24			448
Provision (benefit) for income taxes (FTE)	91			7			7			(54		)	(2		)	49
Net income (loss)	$	203		$	13		$	13		$	(88	)	$	(11	)	$	130
Net credit-related charge-offs	$	28		$	12		$	5		$	—		$	—		$	45
Selected average balances:
Assets	$	33,178		$	6,173		$	4,636		$	11,827		$	5,531		$	61,345
Loans	32,238			5,462			4,569			—			—			42,269
Deposits	23,997			20,373			3,611			161			169			48,311
Statistical data:
Return on average assets (a)	2.45		%	0.25		%	1.07		%	N/M			N/M			0.85		%
Efficiency ratio (b)	34.86			87.54			75.00			N/M			N/M			69.70

(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, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	189		$	171		$	135		$	81		$	(160	)	$	416
Provision for credit losses	(8		)	21			8			(1		)	(4		)	16
Noninterest income	92			35			31			25			17			200
Noninterest expenses	168			97			91			44			16			416
Provision (benefit) for income taxes (FTE)	44			32			23			7			(56		)	50
Net income (loss)	$	77		$	56		$	44		$	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	20,255			14,356			9,959			5,675			447			50,692
Statistical data:
Return on average assets (a)	1.45		%	1.45		%	1.53		%	2.85		%	N/M			0.84		%
Efficiency ratio (b)	59.53			47.04			54.99			42.11			N/M			67.58

(Table continues on following page).

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended March 31, 2012
Earnings summary:
Net interest income (expense) (FTE)	$	196		$	165		$	150		$	76		$	(144	)	$	443
Provision for credit losses	(3		)	(3		)	25			1			2			22
Noninterest income	98			33			31			26			18			206
Noninterest expenses	179			99			93			50			27			448
Provision (benefit) for income taxes (FTE)	40			38			22			5			(56		)	49
Net income (loss)	$	78		$	64		$	41		$	46		$	(99	)	$	130
Net credit-related charge-offs	$	18		$	11		$	7		$	9		$	—		$	45
Selected average balances:
Assets	$	14,092		$	12,310		$	10,080		$	7,505		$	17,358		$	61,345
Loans	13,829			12,096			9,295			7,049			—			42,269
Deposits	19,415			13,688			10,229			4,649			330			48,311
Statistical data:
Return on average assets (a)	1.53		%	1.74		%	1.43		%	2.43		%	N/M			0.85		%
Efficiency ratio (b)	60.88			50.50			51.10			51.93			N/M			69.70

(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

XML

Investment Securities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Securities with no credit impairment in unrealized loss position	87
ARS portfolio redeemed or sold since acquisition at or above cost	95.00%
ARS portfolio redeemed or sold since acquisition	85.00%
Realized losses on available-for-sale securities	$ 0	$ 0
Total, amortized cost	9,788,000,000
Total, fair value	10,013,000,000
Carrying value of securities pledged	3,000,000,000
Liabilities secured by pledged collateral	2,300,000,000
Realized gains on available-for-sale securities	0	5,000,000
Auction-Rate Preferred Securities [Member]
Securities with no credit impairment in unrealized loss position	50
State And Municipal Auction-Rate Securities [Member]
Securities with no credit impairment in unrealized loss position	22
Residential Mortgage-Backed Securities [Member]
Securities with no credit impairment in unrealized loss position	14
Total, amortized cost	9,700,000,000
Total, fair value	9,900,000,000
Auction-Rate Debt Securities [Member]
Securities with no credit impairment in unrealized loss position	1
Total Auction-Rate Securities [Member]
Total, amortized cost	28,000,000
Total, fair value	$ 24,000,000

XML

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, 2013		Mar. 31, 2012
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	$ 43		$ 60
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	32	[1]	54	[1]
Extension Term, Minimum Period	90 days		90 days
AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	11	[2]	6	[2]
Business loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	40		60
Business loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	29	[1]	54	[1]
Business loans | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	11	[2]	6	[2]
Business loans | Commercial
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	7		21
Business loans | Commercial | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	7	[1]	21	[1]
Business loans | Commercial | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[2]	0	[2]
Business loans | Commercial mortgage
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	33		39
Business loans | Commercial mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	22	[1]	33	[1]
Business loans | Commercial mortgage | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	11	[2]	6	[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	16	[3]	30	[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	16	[1],[3]	24	[1],[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]	6	[2],[3]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	17	[4]	9	[4]
Business loans | Commercial mortgage | Other business lines | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	6	[1],[4]	9	[1],[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]	0	[2],[4]
Retail loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	3		0
Retail loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	3	[1]	0	[1]
Retail loans | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[2]	0	[2]
Retail loans | Residential mortgage
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1		0
Retail loans | Residential mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1],[5]	0	[1]
Retail loans | Residential mortgage | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[2]	0	[2]
Retail loans | Consumer
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	2		0
Retail loans | Consumer | Home equity
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1		0
Retail loans | Consumer | Consumer Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1		0
Retail loans | Consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	2	[1]	0	[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]	0	[1]
Retail loans | Consumer | Principal Deferrals | Consumer Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	1	[1],[5]	0	[1]
Retail loans | Consumer | AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[2]	0	[2]
Retail loans | Consumer | AB Note Restructures | Home equity
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	0	[2]	0	[2]
Retail loans | Consumer | AB Note Restructures | Consumer Other Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	$ 0	[2]	$ 0	[2]

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

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

[3] Primarily loans to real estate investors and 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.

XML

Contingent Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Litigation-related expense	$ 3	$ 11
Legal Fees	$ 8	$ 9

XML

Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 877	$ 1,395
Federal funds sold	0	100
Interest-bearing deposits with banks	4,720	3,039
Other short-term investments	115	125
Investment securities available-for-sale	10,286	10,297
Commercial loans	28,508	29,513
Real estate construction loans	1,396	1,240
Commercial mortgage loans	9,317	9,472
Lease financing	853	859
International loans	1,269	1,293
Residential mortgage loans	1,568	1,527
Consumer loans	2,156	2,153
Total loans	45,067	46,057
Less allowance for loan losses	(617)	(629)
Net loans	44,450	45,428
Premises and equipment	618	622
Accrued income and other assets	3,819	4,063
Total assets	64,885	65,069
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing deposits	22,777	23,279
Money market and interest-bearing checking deposits	21,540	21,273
Savings deposits	1,652	1,606
Customer certificates of deposit	5,753	5,531
Foreign office time deposits	395	502
Total interest-bearing deposits	29,340	28,912
Total deposits	52,117	52,191
Short-term borrowings	58	110
Accrued expenses and other liabilities	1,023	1,106
Medium- and long-term debt	4,699	4,720
Total liabilities	57,897	58,127
Common stock - $5 par value: Authorized - 325,000,000 shares; Issued - 228,164,824 shares	1,141	1,141
Capital surplus	2,157	2,162
Accumulated other comprehensive loss	(410)	(413)
Retained earnings	6,020	5,931
Less cost of common stock in treasury - 41,361,612 shares at 3/31/13 and 39,889,610 shares at 12/31/12	(1,920)	(1,879)
Total shareholders' equity	6,988	6,942
Total liabilities and shareholders' equity	$ 64,885	$ 65,069

XML

Credit Quality And Allowance For Credit Losses (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Credit Quality And Allowance For Credit Losses [Abstract]
Commitments to lend additional funds to TDR borrowers	$ 2	$ 5
Allowance for PCI loans	$ 0	$ 0

XML

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$ 0.17	$ 0.10

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
	Mar. 31, 2013		Dec. 31, 2012
Notional Amount	$ 22,297	[1]	$ 21,781	[1]
Risk Management Purposes [Member]
Notional Amount	1,905	[1]	1,925	[1]
Swaps - Fair Value Hedge - Receive Fixed/Pay Floating [Member] | Risk Management Purposes [Member] | Interest Rate Swap [Member] | Medium- and Long-Term Debt Designation [Member]
Notional Amount	$ 1,450		$ 1,450
Weighted Average Remaining Maturity	4 years 2 months 22 days		4 years 4 months 26 days
Weighted Average Receive Rate	5.45%		5.45%
Weighted Average Pay Rate	0.51%	[2]	0.62%	[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, 2013 and December 31, 2012.

XML

Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 268		$ 280
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	104		114
Investment securities available-for-sale	10,286		10,297
Derivative assets	679		753
Total assets at fair value	11,069		11,164
Derivative liabilities	360		409
Deferred compensation plan liabilities	91		88
Total liabilities at fair value	451		497
Recurring [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	91		88
Investment securities available-for-sale	140		125
Derivative assets	0		0
Total assets at fair value	231		213
Derivative liabilities	0		0
Deferred compensation plan liabilities	91		88
Total liabilities at fair value	91		88
Recurring [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	13		26
Investment securities available-for-sale	9,969		9,992
Derivative assets	676		750
Total assets at fair value	10,658		10,768
Derivative liabilities	359		408
Deferred compensation plan liabilities	0		0
Total liabilities at fair value	359		408
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	177		180
Derivative assets	3		3
Total assets at fair value	180		183
Derivative liabilities	1		1
Deferred compensation plan liabilities	0		0
Total liabilities at fair value	1		1
Recurring [Member] | Interest Rate Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	512		556
Derivative liabilities	196		218
Recurring [Member] | Interest Rate Contracts [Member] | 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 [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	512		556
Derivative liabilities	196		218
Recurring [Member] | Interest Rate Contracts [Member] | 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 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	142		173
Derivative liabilities	140		172
Recurring [Member] | Energy Derivative Contracts [Member] | 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 [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	142		173
Derivative liabilities	140		172
Recurring [Member] | Energy Derivative Contracts [Member] | 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 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	22		21
Derivative liabilities	23		18
Recurring [Member] | Foreign Exchange Contracts [Member] | 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 [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	22		21
Derivative liabilities	23		18
Recurring [Member] | Foreign Exchange Contracts [Member] | 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 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	1		1
Recurring [Member] | Other Derivative Liabilities [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0		0
Recurring [Member] | Other Derivative Liabilities [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0		0
Recurring [Member] | Other Derivative Liabilities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	1		1
Recurring [Member] | Deferred Compensation Plan Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	91		88
Recurring [Member] | Deferred Compensation Plan Assets [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	91		88
Recurring [Member] | Deferred Compensation Plan Assets [Member] | 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 [Member] | 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	20		20
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	20		20
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 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	3	[1]	4	[1]
Investment securities available-for-sale	9,913	[1]	9,935	[1]
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	[1]	0	[1]
Investment securities available-for-sale	0	[1]	0	[1]
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	3	[1]	4	[1]
Investment securities available-for-sale	9,913	[1]	9,935	[1]
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	[1]	0	[1]
Investment securities available-for-sale	0	[1]	0	[1]
Recurring [Member] | State And Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	7		19
Investment securities available-for-sale	23	[2]	23	[2]
Recurring [Member] | State And Municipal Securities [Member] | 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	[2]	0	[2]
Recurring [Member] | State And Municipal Securities [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	7		19
Investment securities available-for-sale	0	[2]	0	[2]
Recurring [Member] | State And Municipal Securities [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	23	[2]	23	[2]
Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	3		3
Recurring [Member] | Corporate Debt Securities [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Recurring [Member] | Corporate Debt Securities [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	3		3
Recurring [Member] | Corporate Debt Securities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0		0
Recurring [Member] | Auction-Rate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1		1
Recurring [Member] | Auction-Rate Debt Securities [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring [Member] | Auction-Rate Debt Securities [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring [Member] | Auction-Rate Debt Securities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1		1
Recurring [Member] | Other Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	56		57
Recurring [Member] | Other Corporate Debt Securities [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring [Member] | Other Corporate Debt Securities [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	56		57
Recurring [Member] | Other Corporate Debt Securities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring [Member] | Auction-Rate Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	153		156
Recurring [Member] | Auction-Rate Preferred Securities [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring [Member] | Auction-Rate Preferred Securities [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring [Member] | Auction-Rate Preferred Securities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	153		156
Recurring [Member] | Money Market And Other Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	120		105
Recurring [Member] | Money Market And Other Mutual Funds [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	120		105
Recurring [Member] | Money Market And Other Mutual Funds [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0
Recurring [Member] | Money Market And Other Mutual Funds [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	$ 0		$ 0

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

[2] Primarily auction-rate securities.

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Medium- And Long-Term Debt (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2013
Debt Disclosure [Abstract]
Blanket lien real-estate related loans securing FHLB advances	$ 14

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Derivative And Credit-Related Financial Instruments Derivative And Credit-Related Financial Instruments (Policies)

3 Months Ended

Mar. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block]

The Corporation presents derivative instruments at fair value in the consolidated balance sheets on a net basis when a right of offset exists, based on transactions with a single counterparty and any cash collateral paid to and/or received from that counterparty for derivative contracts that are subject to legally enforceable master netting arrangements.

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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, 2013		Mar. 31, 2012
Warrants
Balance at beginning of period	$ 3		$ 3
Realized gains (losses) recorded in earnings	1	[1]	1	[1]
Unrealized gains (losses) recorded in earnings	0		0
Gains (losses) recorded in other comprehensive income (Pre-tax)	0		0
Sales	(1)		(1)
Settlements	0		0
Balance at end of period	3		3
Other Derivative Liabilities [Member]
Balance at beginning of period	1		6
Realized gains (losses) recorded in earnings	0		0
Unrealized gains (losses) recorded in earnings	0		0
Gains (losses) recorded in other comprehensive income (Pre-tax)	0		0
Sales	0		0
Settlements	0		(6)
Balance at end of period	1		0
Investment Securities Available-For-Sale [Member]
Balance at beginning of period	180		433
Realized gains (losses) recorded in earnings	0		5	[2]
Unrealized gains (losses) recorded in earnings	0		0
Gains (losses) recorded in other comprehensive income (Pre-tax)	1	[3]	3	[3]
Sales	(4)		(97)
Settlements	0		0
Balance at end of period	177		344
State And Municipal Securities [Member] | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	23	[4]	24	[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 (Pre-tax)	0	[4]	(1)	[3],[4]
Sales	0	[4]	0	[4]
Settlements	0	[4]	0	[4]
Balance at end of period	23	[4]	23	[4]
Auction-Rate Debt Securities [Member] | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	1		1
Realized gains (losses) recorded in earnings	0		0
Unrealized gains (losses) recorded in earnings	0		0
Gains (losses) recorded in other comprehensive income (Pre-tax)	0		0
Sales	0		0
Settlements	0		0
Balance at end of period	1		1
Auction-Rate Preferred Securities [Member] | Investment Securities Available-For-Sale [Member]
Balance at beginning of period	156		408
Realized gains (losses) recorded in earnings	0		5	[2]
Unrealized gains (losses) recorded in earnings	0		0
Gains (losses) recorded in other comprehensive income (Pre-tax)	1	[3]	4	[3]
Sales	(4)		(97)
Settlements	0		0
Balance at end of period	$ 153		$ 320

[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 (losses)" 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] Primarily auction-rate securities.

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2013

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, 2013
U.S. Treasury and other U.S. government agency securities	$	20	$	—	$	—	$	20
Residential mortgage-backed securities (a)	9,684		230		1		9,913
State and municipal securities (b)	27		—		4		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	56		—		—		56
Equity and other non-debt securities:
Auction-rate preferred securities	159		—		6		153
Money market and other mutual funds	120		—		—		120
Total investment securities available-for-sale	$	10,067	$	230	$	11	$	10,286
December 31, 2012
U.S. Treasury and other U.S. government agency securities	$	20	$	—	$	—	$	20
Residential mortgage-backed securities (a)	9,687		248		—		9,935
State and municipal securities (b)	27		—		4		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	57		—		—		57
Equity and other non-debt securities:
Auction-rate preferred securities	163		—		7		156
Money market and other mutual funds	105		—		—		105
Total investment securities available-for-sale	$	10,060	$	248	$	11	$	10,297

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

(b) Primarily auction-rate securities.

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, 2013 and December 31, 2012 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, 2013
Residential mortgage-backed securities (a)	$	233	$	1	$	—	$	—		$	233	$	1
State and municipal securities (b)	—		—		23		4			23		4
Corporate debt securities:
Auction-rate debt securities	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities:
Auction-rate preferred securities	—		—		153		6			153		6
Total impaired securities	$	233	$	1	$	177	$	10		$	410	$	11
December 31, 2012
State and municipal securities (b)	$	—	$	—	$	23	$	4		$	23	$	4
Corporate debt securities:
Auction-rate debt securities	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities:
Auction-rate preferred securities	—		—		156		7			156		7
Total impaired securities	$	—	$	—	$	180	$	11		$	180	$	11

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

(b) Primarily 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, 2013	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	81	$	81
After one year through five years	419		425
After five years through ten years	114		113
After ten years	9,174		9,394
Subtotal	9,788		10,013
Equity and other nondebt securities:
Auction-rate preferred securities	159		153
Money market and other mutual funds	120		120
Total investment securities available-for-sale	$	10,067	$	10,286

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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, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 134	$ 130
Income allocated to participating securities	2	1
Net income attributable to common shares	$ 132	$ 129
Basic average common shares	185	195
Basic net income per common share	$ 0.71	$ 0.66
Basic average common shares	185	195
Net effect of the assumed exercise of stock options	0	1
Net effect of the assumed exercise of warrants	2	0
Diluted average common shares	187	196
Diluted net income per common share	$ 0.70	$ 0.66

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Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES
Net income	$ 134	$ 130
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	16	22
Provision for deferred income taxes	29	22
Depreciation and amortization	30	33
Net periodic defined benefit cost	21	19
Share-based compensation expense	10	13
Net amortization of securities	10	10
Accretion of loan purchase discount	(11)	(25)
Net securities gains	0	(5)
Excess tax benefits from share-based compensation arrangements	(1)	(1)
Net change in trading securities	10	(33)
Net change in accrued income receivable	(10)	(1)
Net change in accrued expenses payable	(72)	(85)
Other, net	110	58
Net cash provided by operating activities	276	157
INVESTING ACTIVITIES
Maturities and redemptions of investment securities available-for-sale	938	937
Purchases of investment securities available-for-sale	(955)	(869)
Net change in loans	971	(357)
Other, net	(14)	(14)
Net cash provided by (used in) investing activities	940	(303)
FINANCING ACTIVITIES
Net change in deposits	0	600
Net change in short-term borrowings	(52)	12
Maturities and redemptions of medium- and long-term debt	0	(4)
Repurchases of common stock	(74)	(36)
Cash dividends paid on common stock	(29)	(20)
Excess tax benefits from share-based compensation arrangements	1	1
Other, net	1	(4)
Net cash (used in) provided by financing activities	(153)	549
Net increase in cash and cash equivalents	1,063	403
Cash and cash equivalents at beginning of period	4,534	3,556
Cash and cash equivalents at end of period	5,597	3,959
Interest paid	29	32
Income taxes, tax deposits and tax-related interest paid	1	5
Noncash investing and financing activities:
Loans transferred to other real estate	$ 5	$ 5

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Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
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	41,361,612	39,889,610

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Employee Benefit Plans

3 Months Ended

Mar. 31, 2013

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)	2013			2012
Service cost	$	9		$	8
Interest cost	19			19
Expected return on plan assets	(33		)	(28		)
Amortization of prior service cost	1			1
Amortization of net loss	19			13
Net periodic defined benefit cost	$	15		$	13

Non-Qualified Defined Benefit Pension Plan	Three Months Ended March 31,
(in millions)	2013		2012
Service cost	$	1	$	1
Interest cost	3		2
Amortization of net loss	2		2
Net periodic defined benefit cost	$	6	$	5

Postretirement Benefit Plan	Three Months Ended March 31,
(in millions)	2013			2012
Interest cost	$	1		$	1
Expected return on plan assets	(1		)	(1		)
Amortization of transition obligation	—			1
Net periodic postretirement benefit cost	$	—		$	1

For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2012 Annual Report.

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Document And Entity Information	3 Months Ended
	Mar. 31, 2013	Apr. 25, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2013
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	2013
Document Fiscal Period Focus	Q1
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		186,643,937
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

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Income Taxes And Tax-Related Items

3 Months Ended

Mar. 31, 2013

Income Tax Disclosure [Abstract]

Income Taxes and Tax-Related Items

INCOME TAXES AND TAX-RELATED ITEMS

At March 31, 2013, net unrecognized tax benefits were $42 million, compared to $21 million at March 31, 2012. The increase in unrecognized tax benefits of $21 million was primarily the result of the recognition of various federal and state settlements. The Corporation anticipates that it is reasonably possible that final settlement of federal and state tax issues will result in a decrease of net unrecognized tax benefits of $30 million within the next twelve months. Included in "accrued expense and other liabilities" on the consolidated balance sheets was a $4 million liability for tax-related interest and penalties at March 31, 2013, compared to a $7 million receivable at March 31, 2012. The $11 million increase in accrued interest and penalties payable from March 31, 2012 to March 31, 2013 was primarily a result of actual and anticipated settlements with tax authorities.

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, 2013	Mar. 31, 2012
INTEREST INCOME
Interest and fees on loans	$ 390	$ 411
Interest on investment securities	53	63
Interest on short-term investments	3	3
Total interest income	446	477
INTEREST EXPENSE
Interest on deposits	15	19
Interest on medium- and long-term debt	15	16
Total interest expense	30	35
Net interest income	416	442
Provision for credit losses	16	22
Net interest income after provision for credit losses	400	420
NONINTEREST INCOME
Service charges on deposit accounts	55	56
Fiduciary income	43	38
Commercial lending fees	21	25
Letter of credit fees	16	17
Card fees	12	11
Foreign exchange income	9	10
Bank-owned life insurance	9	10
Brokerage fees	5	5
Net securities gains	0	5
Other noninterest income	30	29
Total noninterest income	200	206
NONINTEREST EXPENSES
Salaries	188	201
Employee benefits	63	59
Total salaries and employee benefits	251	260
Net occupancy expense	39	41
Equipment expense	15	17
Outside processing fee expense	28	26
Software expense	22	23
FDIC insurance expense	9	10
Advertising expense	6	7
Other real estate expense	1	4
Other noninterest expenses	45	60
Total noninterest expenses	416	448
Income before income taxes	184	178
Provision for income taxes	50	48
Net Income	134	130
Income allocated to participating securities	2	1
Net income attributable to common shares	132	129
Basic net income per common share	$ 0.71	$ 0.66
Diluted net income per common share	$ 0.70	$ 0.66
Comprehensive income	137	160
Cash dividends declared on common stock	$ 32	$ 20
Cash dividends declared per common share	$ 0.17	$ 0.10

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Derivative And Credit-Related Financial Instruments

3 Months Ended

Mar. 31, 2013

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. The Corporation presents derivative instruments at fair value in the consolidated balance sheets on a net basis when a right of offset exists, based on transactions with a single counterparty and any cash collateral paid to and/or received from that counterparty for derivative contracts that are subject to legally enforceable master netting arrangements. 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. For derivatives 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, 2013, counterparties with bilateral collateral agreements had pledged $75 million of marketable investment securities and deposited $83 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had pledged $45 million of investment securities and posted $3 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, 2013 was $48 million, for which the Corporation had pledged collateral of $33 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, 2013, the Corporation would have been required to assign an additional $15 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.

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, 2013 and December 31, 2012. 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, 2013								December 31, 2012
			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	$	272		$	—		$	1,450	$	290		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	455		1			1			475		1			—
Total risk management purposes	1,905		273			1			1,925		291			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	564		—			3			545		—			3
Caps and floors purchased	564		3			—			545		3			—
Swaps	11,061		237			193			10,952		263			215
Total interest rate contracts	12,189		240			196			12,042		266			218
Energy contracts:
Caps and floors written	1,875		—			85			1,873		—			112
Caps and floors purchased	1,875		85			—			1,873		112			—
Swaps	2,441		57			55			1,815		61			60
Total energy contracts	6,191		142			140			5,561		173			172
Foreign exchange contracts:
Spot, forwards, options and swaps	2,012		21			22			2,253		20			18
Total customer-initiated and other activities	20,392		403			358			19,856		459			408
Total gross derivatives	$	22,297	676			359			$	21,781	750			408
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(252		)	(252		)			(279		)	(279		)
Netting adjustment - Cash collateral received/posted			(82		)	(2		)			(11		)	—
Net derivatives included in the consolidated balance sheets (b)			342			105					460			129
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(74		)	(45		)			(180		)	(56		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	268		$	60				$	280		$	73

(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 $5 million and $4 million at March 31, 2013 and December 31, 2012, respectively.

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 and $17 million for the three months ended March 31, 2013 and 2012, respectively. 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, 2013 and 2012.

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-month periods ended March 31, 2013 and 2012.

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, 2013 and December 31, 2012.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
March 31, 2013
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,450	4.2	5.45	%	0.51	%
December 31, 2012
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,450		4.4	5.45		0.62

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at March 31, 2013 and December 31, 2012.

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, 2013 and 2012.

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	2013		2012
Interest rate contracts	Other noninterest income	$	3	$	2
Energy contracts	Other noninterest income	1		1
Foreign exchange contracts	Foreign exchange income	9		9
Total		$	13	$	12

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, 2013		December 31, 2012
Unused commitments to extend credit:
Commercial and other	$	26,683	$	25,659
Bankcard, revolving check credit and home equity loan commitments	1,687		1,681
Total unused commitments to extend credit	$	28,370	$	27,340
Standby letters of credit	$	4,908	$	4,985
Commercial letters of credit	60		78
Other credit-related financial instruments	1		1

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, 2013 and December 31, 2012, the allowance for credit losses on lending-related commitments, included in “accrued expenses and other liabilities” on the consolidated balance sheets, was $36 million and $32 million, respectively. The Corporation recorded a purchase discount for acquired lending-related commitments. An allowance for credit losses will be recorded on acquired lending-related commitments only to the extent that the required allowance exceeds the remaining purchase discount. At both March 31, 2013 and December 31, 2012, no allowance was recorded for acquired lending-related commitments and $2 million of purchase discount remained.

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 $20 million and $19 million at March 31, 2013 and December 31, 2012, respectively, for probable credit losses inherent in the Corporation’s unused commitments to extend credit.

Standby and Commercial Letters of Credit

Standby letters of credit represent conditional obligations of the Corporation which guarantee the performance of a customer to a third party. Standby letters of credit are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing and similar transactions. Commercial letters of credit are issued to finance foreign or domestic trade transactions. These contracts expire in decreasing amounts through the year 2022. The Corporation may enter into participation arrangements with third parties that effectively reduce the maximum amount of future payments which may be required under standby and commercial letters of credit. These risk participations covered $319 million and $325 million, respectively, of the $5.0 billion and $5.1 billion standby and commercial letters of credit outstanding at March 31, 2013 and December 31, 2012, 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 $82 million at March 31, 2013, including $66 million in deferred fees and $16 million in the allowance for credit losses on lending-related commitments. At December 31, 2012, the comparable amounts were $82 million, $69 million and $13 million, respectively.

The following table presents a summary of internally classified watch list standby and commercial letters of credit at March 31, 2013 and December 31, 2012. The Corporation's internal watch 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, 2013			December 31, 2012
Total watch list standby and commercial letters of credit	$	142		$	144
As a percentage of total outstanding standby and commercial letters of credit	2.9		%	2.9		%

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, 2013 and December 31, 2012, the total notional amount of the credit risk participation agreements was approximately $594 million and $574 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 $10 million and $11 million at March 31, 2013 and December 31, 2012, 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, 2013, the weighted average remaining maturity of outstanding credit risk participation agreements was 2.7 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 $1 million at both March 31, 2013 and December 31, 2012, respectively.

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Credit Quality And Allowance For Credit Losses

3 Months Ended

Mar. 31, 2013

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, 2013
Business loans:
Commercial	$	46	$	9	$	2	$	57	$	102	$	28,349	$	28,508
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		30		1,155		1,185
Other business lines (b)	—		—		—		—		3		208		211
Total real estate construction	—		—		—		—		33		1,363		1,396
Commercial mortgage:
Commercial Real Estate business line (a)	14		—		6		20		86		1,706		1,812
Other business lines (b)	64		2		9		75		178		7,252		7,505
Total commercial mortgage	78		2		15		95		264		8,958		9,317
Lease financing	—		—		—		—		—		853		853
International	1		—		—		1		—		1,268		1,269
Total business loans	125		11		17		153		399		40,791		41,343
Retail loans:
Residential mortgage	15		3		3		21		65		1,482		1,568
Consumer:
Home equity	4		3		—		7		28		1,463		1,498
Other consumer	7		1		5		13		2		643		658
Total consumer	11		4		5		20		30		2,106		2,156
Total retail loans	26		7		8		41		95		3,588		3,724
Total loans	$	151	$	18	$	25	$	194	$	494	$	44,379	$	45,067
December 31, 2012
Business loans:
Commercial	$	23	$	19	$	5	$	47	$	103	$	29,363	$	29,513
Real estate construction:
Commercial Real Estate business line (a)	—		—		—		—		30		1,019		1,049
Other business lines (b)	—		—		—		—		3		188		191
Total real estate construction	—		—		—		—		33		1,207		1,240
Commercial mortgage:
Commercial Real Estate business line (a)	20		4		—		24		94		1,755		1,873
Other business lines (b)	27		9		8		44		181		7,374		7,599
Total commercial mortgage	47		13		8		68		275		9,129		9,472
Lease financing	—		—		—		—		3		856		859
International	4		—		3		7		—		1,286		1,293
Total business loans	74		32		16		122		414		41,841		42,377
Retail loans:
Residential mortgage	27		6		2		35		70		1,422		1,527
Consumer:
Home equity	9		3		—		12		31		1,494		1,537
Other consumer	4		3		5		12		4		600		616
Total consumer	13		6		5		24		35		2,094		2,153
Total retail loans	40		12		7		59		105		3,516		3,680
Total loans	$	114	$	44	$	23	$	181	$	519	$	45,357	$	46,057

(a) Primarily loans to real estate investors and developers.

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

(c) Included purchased credit-impaired (PCI) loans with a total carrying value of $29 million and $36 million at March 31, 2013 and December 31, 2012, respectively.

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, 2013
Business loans:
Commercial	$	26,875	$	881	$	650	$	102	$	28,508
Real estate construction:
Commercial Real Estate business line (e)	1,058		80		17		30		1,185
Other business lines (f)	198		2		8		3		211
Total real estate construction	1,256		82		25		33		1,396
Commercial mortgage:
Commercial Real Estate business line (e)	1,457		179		90		86		1,812
Other business lines (f)	6,741		232		354		178		7,505
Total commercial mortgage	8,198		411		444		264		9,317
Lease financing	843		8		2		—		853
International	1,220		48		1		—		1,269
Total business loans	38,392		1,430		1,122		399		41,343
Retail loans:
Residential mortgage	1,487		9		7		65		1,568
Consumer:
Home equity	1,457		7		6		28		1,498
Other consumer	622		23		11		2		658
Total consumer	2,079		30		17		30		2,156
Total retail loans	3,566		39		24		95		3,724
Total loans	$	41,958	$	1,469	$	1,146	$	494	$	45,067
December 31, 2012
Business loans:
Commercial	$	28,032	$	820	$	558	$	103	$	29,513
Real estate construction:
Commercial Real Estate business line (e)	921		77		21		30		1,049
Other business lines (f)	176		3		9		3		191
Total real estate construction	1,097		80		30		33		1,240
Commercial mortgage:
Commercial Real Estate business line (e)	1,479		213		87		94		1,873
Other business lines (f)	6,783		258		377		181		7,599
Total commercial mortgage	8,262		471		464		275		9,472
Lease financing	840		9		7		3		859
International	1,230		57		6		—		1,293
Total business loans	39,461		1,437		1,065		414		42,377
Retail loans:
Residential mortgage	1,438		12		7		70		1,527
Consumer:
Home equity	1,489		11		6		31		1,537
Other consumer	581		22		9		4		616
Total consumer	2,070		33		15		35		2,153
Total retail loans	3,508		45		22		105		3,680
Total loans	$	42,969	$	1,482	$	1,087	$	519	$	46,057

(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. Included in the special mention category were $210 million and $303 million at March 31, 2013 and December 31, 2012, respectively, of loans proactively monitored by management that were considered “pass” by regulatory authorities.

(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 - Summary of Significant Accounting Policies - on page F-59 in the Corporation's 2012 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 investors and developers.

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

The following table summarizes nonperforming assets.

(in millions)	March 31, 2013		December 31, 2012
Nonaccrual loans	$	494	$	519
Reduced-rate loans (a)	21		22
Total nonperforming loans	515		541
Foreclosed property	40		54
Total nonperforming assets	$	555	$	595

(a) Reduced-rate business loans totaled $6 million at both March 31, 2013 and December 31, 2012, respectively, and reduced-rate retail loans totaled $15 million and $16 million, at March 31, 2013 and December 31, 2012, respectively.

Allowance for Credit Losses

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

	2013									2012
(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	$	552		$	77		$	629		$	648		$	78		$	726
Loan charge-offs	(34		)	(4		)	(38		)	(55		)	(7		)	(62		)
Recoveries on loans previously charged-off	12			2			14			14			3			17
Net loan charge-offs	(22		)	(2		)	(24		)	(41		)	(4		)	(45		)
Provision for loan losses	14			(2		)	12			25			(2		)	23
Balance at end of period	$	544		$	73		$	617		$	632		$	72		$	704
As a percentage of total loans	1.32		%	1.97		%	1.37		%	1.61		%	1.94		%	1.64		%
March 31
Allowance for loan losses:
Individually evaluated for impairment	$	60		$	—		$	60		$	143		$	1		$	144
Collectively evaluated for impairment	484			73			557			489			71			560
Total allowance for loan losses	$	544		$	73		$	617		$	632		$	72		$	704
Loans:
Individually evaluated for impairment	$	355		$	42		$	397		$	702		$	50		$	752
Collectively evaluated for impairment	40,964			3,677			44,641			38,523			3,665			42,188
PCI loans (a)	24			5			29			64			8			72
Total loans evaluated for impairment	$	41,343		$	3,724		$	45,067		$	39,289		$	3,723		$	43,012

(a)    No allowance for loan losses was required for PCI loans at March 31, 2013 and 2012.

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)	2013		2012
Balance at beginning of period	$	32	$	26
Provision for credit losses on lending-related commitments	4		(1		)
Balance at end of period	$	36	$	25

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, 2013
Business loans:
Commercial	$	11	$	98	$	109	$	201	$	22
Real estate construction:
Commercial Real Estate business line (a)	—		28		28		41		4
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		28		28		42		4
Commercial mortgage:
Commercial Real Estate business line (a)	4		89		93		151		12
Other business lines (b)	5		120		125		174		22
Total commercial mortgage	9		209		218		325		34
Lease financing	—		—		—		—		—
Total business loans	20		335		355		568		60
Retail loans:
Residential mortgage	34		—		34		40		—
Consumer:
Home equity	4		—		4		6		—
Other consumer	4		—		4		10		—
Total consumer	8		—		8		16		—
Total retail loans (c)	42		—		42		56		—
Total individually evaluated impaired loans	$	62	$	335	$	397	$	624	$	60
December 31, 2012
Business loans:
Commercial	$	2	$	117	$	119	$	207	$	26
Real estate construction:
Commercial Real Estate business line (a)	—		26		26		31		4
Other business lines (b)	—		—		—		1		—
Total real estate construction	—		26		26		32		4
Commercial mortgage:
Commercial Real Estate business line (a)	—		99		99		159		18
Other business lines (b)	—		122		122		167		28
Total commercial mortgage	—		221		221		326		46
Lease financing	—		2		2		5		—
International	—		—		—		—		—
Total business loans	2		366		368		570		76
Retail loans:
Residential mortgage	39		—		39		48		—
Consumer:
Home equity	8		—		8		10		—
Other consumer	4		—		4		10		—
Total consumer	12		—		12		20		—
Total retail loans (c)	51		—		51		68		—
Total individually evaluated impaired loans	$	53	$	366	$	419	$	638	$	76

(a) Primarily loans to real estate investors and 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.

	2013				2012
(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	$	114	$	1	$	236	$	1
Real estate construction:
Commercial Real Estate business line (a)	27		—		85		—
Other business lines (b)	—		—		5		—
Total real estate construction	27		—		90		—
Commercial mortgage:
Commercial Real Estate business line (a)	96		—		163		—
Other business lines (b)	124		—		212		1
Total commercial mortgage	220		—		375		1
Lease financing	1		—		3		—
International	—		—		6		—
Total business loans	362		1		710		2
Retail loans:
Residential mortgage	37		—		44		—
Consumer:
Home equity	6		—		3		—
Other consumer	4		—		4		—
Total consumer	10		—		7		—
Total retail loans	47		—		51		—
Total individually evaluated impaired loans	$	409	$	1	$	761	$	2

(a) Primarily loans to real estate investors and developers.

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

Troubled Debt Restructurings

The following tables detail the recorded balance at March 31, 2013 and 2012 of loans considered to be TDRs that were restructured during the three months ended March 31, 2013 and 2012, 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.

	2013							2012
	Type of Modification							Type of Modification
(in millions)	Principal Deferrals (a)			AB Note Restructures (b)		Total Modifications		Principal Deferrals (a)		AB Note Restructures (b)		Total Modifications
Three Months Ended March 31
Business loans:
Commercial	$	7		$	—	$	7	$	21	$	—	$	21
Commercial mortgage:
Commercial Real Estate business line (c)	16			—		16		24		6		30
Other business lines (d)	6			11		17		9		—		9
Total commercial mortgage	22			11		33		33		6		39
Total business loans	29			11		40		54		6		60
Retail loans:
Residential mortgage	1		(e)	—		1		—		—		—
Consumer:
Home equity	1		(e)	—		1		—		—		—
Other consumer	1		(e)	—		1		—		—		—
Total consumer	2			—		2		—		—		—
Total retail loans	3			—		3		—		—		—
Total loans	$	32		$	11	$	43	$	54	$	6	$	60

(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 investors and 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, 2013 and December 31, 2012, commitments to lend additional funds to borrowers whose terms have been modified in TDRs totaled $2 million and $5 million, respectively.

The majority of the modifications considered to be TDRs that occurred during the three months ended March 31, 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, 2013 and 2012 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, 2013 and 2012 of loans modified by principal deferral during the twelve months ended March 31, 2013 and 2012, and those principal deferrals which experienced a subsequent default during the three months ended March 31, 2013 and 2012. 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.

	2013					2012
(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	$	12		$	1	$	92	$	12
Real estate construction:
Commercial Real Estate business line (a)	1			—		—		—
Commercial mortgage:
Commercial Real Estate business line (a)	36			16		53		7
Other business lines (b)	17			4		39		8
Total commercial mortgage	53			20		92		15
Total business loans	66			21		184		27
Retail loans:
Residential mortgage	5		(c)	—		—		—
Consumer:
Home equity	4		(c)	—		—		—
Other consumer	2		(c)	—		3		—
Total consumer	6			—		3		—
Total retail loans	11			—		3		—
Total principal deferrals	$	77		$	21	$	187	$	27

(a) Primarily loans to real estate investors and 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.

The following table presents information regarding the recorded balance at March 31, 2013 and 2012 of loans modified by interest rate reduction during the twelve months ended March 31, 2013 and 2012, and those reduced-rate loans which experienced a subsequent default during the three months ended March 31, 2013 and 2012. For reduced-rate loans, a subsequent payment default is defined in terms of delinquency, when a principal or interest payment is 90 days past due.

	2013				2012
(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
Interest rate reductions:
Business loans:
Commercial	$	—	$	—	$	1	$	1
Real estate construction:
Commercial Real Estate business line (a)	—		—		1		—
Commercial mortgage:
Other business lines (b)	2		—		18		2
Lease financing	—		—		3		—
Total business loans	2		—		23		3
Retail loans:
Residential mortgage	1		—		9		1
Consumer:
Other consumer	1		—		—		—
Total retail loans	2		—		9		1
Total interest rate reductions	$	4	$	—	$	32	$	4

(a) Primarily loans to real estate investors and developers.

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

During the twelve months ended March 31, 2013 and 2012 loans with a carrying value of $30 million and $33 million at March 31, 2013 and 2012, respectively, were restructured into two notes (AB note restructures). For 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 AB note restructures during both the three-month periods ended March 31, 2013 and 2012.

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.

The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at March 31, 2013 and December 31, 2012 were as follows. The outstanding balance represents the total amount owed as of March 31, 2013 and December 31, 2012, including accrued but unpaid interest and any amounts previously charged off. No allowance for loan losses was required on the acquired PCI loan pools at both March 31, 2013 and December 31, 2012.

(in millions)	March 31, 2013		December 31, 2012
Acquired PCI loans:
Carrying amount	$	29	$	36
Outstanding balance	125		138

Changes in the accretable yield for acquired PCI loans for the three months ended March 31, 2013 and 2012 were as follows.

	Three Months Ended March 31,
(in millions)	2013			2012
Balance at beginning of period	$	16		$	25
Accretion	(4		)	(5		)
Balance at end of period	$	12		$	20

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

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, 2013 and 2012.

(in millions)	Total		Level 1		Level 2		Level 3
March 31, 2013
Trading securities:
Deferred compensation plan assets	$	91	$	91	$	—	$	—
Residential mortgage-backed securities (a)	3		—		3		—
State and municipal securities	7		—		7		—
Corporate debt securities	3		—		3		—
Total trading securities	104		91		13		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	20		20		—		—
Residential mortgage-backed securities (a)	9,913		—		9,913		—
State and municipal securities (b)	23		—		—		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	56		—		56		—
Equity and other non-debt securities:
Auction-rate preferred securities	153		—		—		153
Money market and other mutual funds	120		120		—		—
Total investment securities available-for-sale	10,286		140		9,969		177
Derivative assets:
Interest rate contracts	512		—		512		—
Energy derivative contracts	142		—		142		—
Foreign exchange contracts	22		—		22		—
Warrants	3		—		—		3
Total derivative assets	679		—		676		3
Total assets at fair value	$	11,069	$	231	$	10,658	$	180
Derivative liabilities:
Interest rate contracts	$	196	$	—	$	196	$	—
Energy derivative contracts	140		—		140		—
Foreign exchange contracts	23		—		23		—
Other	1		—		—		1
Total derivative liabilities	360		—		359		1
Deferred compensation plan liabilities	91		91		—		—
Total liabilities at fair value	$	451	$	91	$	359	$	1

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

(b) Primarily auction-rate securities.

(in millions)	Total		Level 1		Level 2		Level 3
December 31, 2012
Trading securities:
Deferred compensation plan assets	$	88	$	88	$	—	$	—
Residential mortgage-backed securities (a)	4		—		4		—
State and municipal securities	19		—		19		—
Corporate debt securities	3		—		3		—
Total trading securities	114		88		26		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	20		20		—		—
Residential mortgage-backed securities (a)	9,935		—		9,935		—
State and municipal securities (b)	23		—		—		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	57		—		57		—
Equity and other non-debt securities:
Auction-rate preferred securities	156		—		—		156
Money market and other mutual funds	105		105		—		—
Total investment securities available-for-sale	10,297		125		9,992		180
Derivative assets:
Interest rate contracts	556		—		556		—
Energy derivative contracts	173		—		173		—
Foreign exchange contracts	21		—		21		—
Warrants	3		—		—		3
Total derivative assets	753		—		750		3
Total assets at fair value	$	11,164	$	213	$	10,768	$	183
Derivative liabilities:
Interest rate contracts	$	218	$	—	$	218	$	—
Energy derivative contracts	172		—		172		—
Foreign exchange contracts	18		—		18		—
Other	1		—		—		1
Total derivative liabilities	409		—		408		1
Deferred compensation plan liabilities	88		88		—		—
Total liabilities at fair value	$	497	$	88	$	408	$	1

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

(b) Primarily 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, 2013 and 2012.

			Net Realized/Unrealized Gains (Losses)
	Balance  at Beginning of Period		Recorded in Earnings					Recorded in Other Comprehensive Income (Pretax)										Balance  at End of  Period
(in millions)			Realized			Unrealized						Sales			Settlements
Three Months Ended March 31, 2013
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—		$	—	$	—			$	—		$	—		$	23
Auction-rate debt securities	1		—			—		—				—			—			1
Auction-rate preferred securities	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
Three Months Ended March 31, 2012
Investment securities available-for-sale:
State and municipal securities (a)	$	24	$	—		$	—	$	(1	)	(b)	$	—		$	—		$	23
Auction-rate debt securities	1		—			—		—				—			—			1
Auction-rate preferred securities	408		5		(c)	—		4			(b)	(97		)	—			320
Total investment securities available-for-sale	433		5		(c)	—		3			(b)	(97		)	—			344
Derivative assets:
Warrants	3		1		(d)	—		—				(1		)	—			3
Derivative liabilities:
Other	6		—			—		—				—			(6		)	—

(a) Primarily 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 (losses)" 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, 2013 and December 31, 2012 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012.

(in millions)	Level 3
March 31, 2013
Loans:
Commercial	$	56
Real estate construction	27
Commercial mortgage	122
Total loans	205
Nonmarketable equity securities	2
Other real estate	20
Loan servicing rights	2
Total assets at fair value	$	229
December 31, 2012
Loans:
Commercial	$	42
Real estate construction	25
Commercial mortgage	145
Lease financing	2
Total loans	214
Nonmarketable equity securities	2
Other real estate	24
Loan servicing rights	2
Total assets at fair value	$	242

Quantitative Information About Level 3 Measurements

The following table presents quantitative information related to the significant unobservable inputs utilized in the Corporation's significant Level 3 recurring fair value measurement as of March 31, 2013 and December 31, 2012. The Corporation's significant 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.

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
March 31, 2013
State and municipal securities (a)	$	23	6% - 10%	4 - 6
Equity and other non-debt securities:
Auction-rate preferred securities	153		4% - 6%	2 - 5
December 31, 2012
State and municipal securities (a)	$	23	6% - 10%	4 - 6
Equity and other non-debt securities:
Auction-rate preferred securities	156		4% - 6%	2 - 4

(a) Primarily 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, 2013
Assets
Cash and due from banks	$	877		$	877		$	877	$	—	$	—
Interest-bearing deposits with banks	4,720			4,720			4,720		—		—
Loans held-for-sale	12			12			—		12		—
Total loans, net of allowance for loan losses (a)	44,450			44,622			—		—		44,622
Customers’ liability on acceptances outstanding	13			13			13		—		—
Nonmarketable equity securities (b)	13			20			—		—		20
Restricted equity investments	174			174			174		—		—
Liabilities
Demand deposits (noninterest-bearing)	22,777			22,777			—		22,777		—
Interest-bearing deposits	23,587			23,587			—		23,587		—
Customer certificates of deposit	5,753			5,755			—		5,755		—
Total deposits	52,117			52,119			—		52,119		—
Short-term borrowings	58			58			58		—		—
Acceptances outstanding	13			13			13		—		—
Medium- and long-term debt	4,699			4,702			—		4,702		—
Credit-related financial instruments	(104		)	(104		)	—		—		(104		)
December 31, 2012
Assets
Cash and due from banks	$	1,395		$	1,395		$	1,395	$	—	$	—
Federal funds sold	100			100			100		—		—
Interest-bearing deposits with banks	3,039			3,039			3,039		—		—
Loans held-for-sale	12			12			—		12		—
Total loans, net of allowance for loan losses (a)	45,428			45,649			—		—		45,649
Customers’ liability on acceptances outstanding	18			18			18		—		—
Nonmarketable equity securities (b)	13			22			—		—		22
Restricted equity investments	174			174			174		—		—
Liabilities
Demand deposits (noninterest-bearing)	23,279			23,279			—		23,279		—
Interest-bearing deposits	23,381			23,381			—		23,381		—
Customer certificates of deposit	5,531			5,535			—		5,535		—
Total deposits	52,191			52,195			—		52,195		—
Short-term borrowings	110			110			110		—		—
Acceptances outstanding	18			18			18		—		—
Medium- and long-term debt	4,720			4,685			—		4,685		—
Credit-related financial instruments	(103		)	(103		)	—		—		(103		)

(a) Included $205 million and $214 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2013 and December 31, 2012, respectively.

(b) Included $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at both March 31, 2013 and December 31, 2012.

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Contingent Liabilities

3 Months Ended

Mar. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Contingent Liabilities

CONTINGENT LIABILITIES

Legal Proceedings

The Corporation and certain of its subsidiaries are subject to various 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 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. Litigation-related expense of $3 million and $11 million and legal fees of $8 million and $9 million were included in “other noninterest expenses” on the consolidated statements of comprehensive income for the three months ended March 31, 2013 and 2012, respectively. 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.

For other matters, where a loss is not probable, the Corporation has not established legal reserves. In determining whether it is possible to provide an estimate of loss or range of possible loss, the Corporation reviews and evaluates its material litigation on an ongoing basis, in conjunction with legal counsel, in light of potentially relevant factual and legal developments. Based on current knowledge, expectation of future earnings, and after consultation with legal counsel, management believes the maximum amount of reasonably possible losses would not have a material adverse effect on the Corporation's consolidated financial condition, consolidated results of operations or consolidated cash flows.

 The damages alleged by plaintiffs or claimants may be overstated, unsubstantiated by legal theory, unsupported by the facts, and/or bear no relation to the ultimate award that a court, jury or agency might impose. In view of the inherent difficulty of predicting the outcome of such matters, the Corporation cannot state with confidence a range of reasonably possible losses, nor what the eventual outcome of these matters will be. However, based on current knowledge and after consultation with legal counsel, management believes the maximum amount of reasonably possible losses would not have a material adverse effect on the Corporation’s consolidated financial condition, consolidated results of operations or consolidated cash flows.

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 Income (Loss)

3 Months Ended

Mar. 31, 2013

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

Accumulated Other Comprehensive Income (Loss)

ACCUMULATED OTHER COMPREHENSIVE INCOME (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, 2013 and 2012, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Three Months Ended March 31,
(in millions)	2013			2012
Accumulated net unrealized gains on investment securities available-for-sale:
Balance at beginning of period, net of tax	$	150		$	129
Net unrealized holding gains (losses) arising during the period	(18		)	35
Less: Provision (benefit) for income taxes	(7		)	13
Net unrealized holding gains (losses) arising during the period, net of tax	(11		)	22
Less:
Net realized gains included in net securities gains	—			5
Less: Provision for income taxes	—			2
Reclassification adjustment for net securities gains included in net income, net of tax	—			3
Change in net unrealized gains on investment securities available-for-sale, net of tax	(11		)	19
Balance at end of period, net of tax	$	139		$	148
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(563	)	$	(485	)
Net defined benefit pension and other postretirement adjustment arising during the period, net of tax	—			—
Less:
Amortization of actuarial net loss	(21		)	(15		)
Amortization of prior service cost	(1		)	(1		)
Amortization of transition obligation	—			(1		)
Amounts recognized in employee benefits expense	(22		)	(17		)
Less: Benefit for income taxes	(8		)	(6		)
Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax	(14		)	(11		)
Change in defined benefit pension and other postretirement plans adjustment, net of tax	14			11
Balance at end of period, net of tax	$	(549	)	$	(474	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(410	)	$	(326	)

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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, 2013	Mar. 31, 2012
Net derivative gain recognized in income	$ 13	$ 12
Interest Rate Contracts [Member] | Other Noninterest Income [Member]
Net derivative gain recognized in income	3	2
Energy Contracts [Member] | Other Noninterest Income [Member]
Net derivative gain recognized in income	1	1
Foreign Exchange Contracts [Member] | Foreign Exchange Income [Member]
Net derivative gain recognized in income	$ 9	$ 9

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Variable Interest Entities (VIEs)

3 Months Ended

Mar. 31, 2013

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 following provides a summary of the VIEs in which the Corporation has an interest.

The Corporation holds ownership interests in funds in the form of limited partnerships or limited liability companies (LLCs) investing in low income housing projects. The Corporation also directly invests in limited partnerships and LLCs which invest in community development projects which generate similar tax credits to investors. 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 interest in these entities on either the cost or equity method. Exposure to loss as a result of the Corporation’s involvement with these entities at March 31, 2013 was limited to approximately $371 million, which reflected the carrying value of the Corporation's investment and unfunded commitments for future investments.

As an investor, the Corporation obtains income tax credits and deductions from the operating losses of these tax credit entities. The income tax credits and deductions are allocated to the investors based on their ownership percentages and are recorded as a reduction of income tax expense (or an increase to income tax benefit) and a reduction of federal income taxes payable. Investment balances, including all legally binding commitments to fund future investments, are included in “accrued income and other assets” on the consolidated balance sheets, with amortization and other write-downs of investments recorded in “other noninterest income” on the consolidated statements of comprehensive income. In addition, 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 ($121 million at March 31, 2013).

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, 2013 and 2012.

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

	Three Months Ended March 31,
(in millions)	2013			2012
Other noninterest income	$	(14	)	$	(14	)
Benefit for income taxes (a)	(14		)	(14		)

(a) Income tax credits from low income housing tax credit/historic rehabilitation tax credit partnerships.

For further information on the Corporation’s consolidation policy, see Note 1 to the consolidated financial statements in the Corporation's 2012 Annual Report.

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Medium- And Long-Term Debt

3 Months Ended

Mar. 31, 2013

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, 2013		December 31, 2012
Parent company
Subordinated notes:
4.80% subordinated notes due 2015	$	327	$	330
Medium-term notes:
3.00% notes due 2015	299		299
Total parent company	626		629
Subsidiaries
Subordinated notes:
7.375% subordinated notes due 2013	50		51
5.70% subordinated notes due 2014	264		267
5.75% subordinated notes due 2016	691		694
5.20% subordinated notes due 2017	587		593
Floating-rate based on LIBOR index subordinated notes due 2018	26		26
8.375% subordinated notes due 2024	186		186
7.875% subordinated notes due 2026	236		241
Total subordinated notes	2,040		2,058
Federal Home Loan Bank advances:
Floating-rate based on LIBOR indices due 2013 to 2014	2,000		2,000
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	33		33
Total subsidiaries	4,073		4,091
Total medium- and long-term debt	$	4,699	$	4,720

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

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

Comerica Bank (the Bank) is a member of the FHLB, which provides short- and long-term funding 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, 2013.

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Net Income Per Common Share

3 Months Ended

Mar. 31, 2013

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)	2013		2012
Basic and diluted
Net income	$	134	$	130
Less:
Income allocated to participating securities	2		1
Net income attributable to common shares	$	132	$	129
Basic average common shares	185		195
Basic net income per common share	$	0.71	$	0.66
Basic average common shares	185		195
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	—		1
Net effect of the assumed exercise of warrants	2		—
Diluted average common shares	187		196
Diluted net income per common share	$	0.70	$	0.66

The following average shares related to outstanding options and warrants 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 and warrants were greater than the average market price of common shares for the period.

	Three Months Ended March 31,
(shares in millions)	2013	2012
Average outstanding options	15.1	17.6
Range of exercise prices	$34.78 - $61.94	$30.77 - $64.50
Average outstanding warrants		0.6
Exercise price		$30.36

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Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Variable Interest Entity [Line Items]
Other noninterest income	$ 30		$ 29
Benefit for income taxes	50		48
Variable Interest Entity
Variable Interest Entity [Line Items]
Other noninterest income	(14)		(14)
Benefit for income taxes	$ (14)	[1]	$ (14)	[1]

[1] Income tax credits from low income housing tax credit/historic rehabilitation tax credit partnerships.

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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
	Mar. 31, 2013	Dec. 31, 2012
Debt Instruments [Line Items]
Total medium- and long-term debt	$ 4,699	$ 4,720
Parent Company
Debt Instruments [Line Items]
Total medium- and long-term debt	626	629
Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	2,040	2,058
Total medium- and long-term debt	4,073	4,091
4.80% subordinated notes due 2015 [Member] | Parent Company
Debt Instruments [Line Items]
Subordinated notes	327	330
Fixed Interest Rate	4.80%	4.80%
Maturity Date	Dec. 31, 2015	Dec. 31, 2015
3.00% notes due 2015 [Member] | Parent Company
Debt Instruments [Line Items]
Medium-term notes	299	299
Fixed Interest Rate	3.00%	3.00%
Maturity Date	Dec. 31, 2015	Dec. 31, 2015
7.375% subordinated notes due 2013 [Member] | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	50	51
Fixed Interest Rate	7.375%	7.375%
Maturity Date	Dec. 31, 2013	Dec. 31, 2013
5.70% subordinated notes due 2014 [Member] | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	264	267
Fixed Interest Rate	5.70%	5.70%
Maturity Date	Dec. 31, 2014	Dec. 31, 2014
5.75% subordinated notes due 2016 [Member] | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	691	694
Fixed Interest Rate	5.75%	5.75%
Maturity Date	Dec. 31, 2016	Dec. 31, 2016
5.20% subordinated notes due 2017 [Member] | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	587	593
Fixed Interest Rate	5.20%	5.20%
Maturity Date	Dec. 31, 2017	Dec. 31, 2017
Floating-rate based on LIBOR index subordinated notes due 2018 [Member] | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	26	26
Maturity Date	Dec. 31, 2018	Dec. 31, 2018
8.375% subordinated notes due 2024 [Member] | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	186	186
Fixed Interest Rate	8.375%	8.375%
Maturity Date	Dec. 31, 2024	Dec. 31, 2024
7.875% subordinated notes due 2026 [Member] | Subsidiaries
Debt Instruments [Line Items]
Subordinated notes	236	241
Fixed Interest Rate	7.875%	7.875%
Maturity Date	Dec. 31, 2026	Dec. 31, 2026
Floating-rate based on LIBOR indices due 2013 to 2014 [Member] | Subsidiaries
Debt Instruments [Line Items]
Federal Home Loan Bank advances	2,000	2,000
Maturity Date Range - start	Dec. 31, 2013	Dec. 31, 2013
Maturity Date Range - end	Dec. 31, 2014	Dec. 31, 2014
6.0% - 6.4% fixed-rate notes due 2020 [Member] | Subsidiaries
Debt Instruments [Line Items]
Other Notes	$ 33	$ 33
Floating Interest Rate - minimum	6.00%	6.00%
Floating Interest Rate - maximum	6.40%	6.40%
Maturity Date	Dec. 31, 2020	Dec. 31, 2020

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Variable Interest Entities (VIEs) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Exposure to loss as a result of involvement with VIEs	$ 371
Unfunded commitments to fund low income housing partnerships	121
Corporation provided financial or other support not contractually required to VIEs	$ 0	$ 0

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Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Underlying assets of funds, estimated liquidation period, years, maximum	17 years
Commitments to fund additional investments in nonmarketable equity securities	$ 1			$ 2
Federal Home Loan Bank stock	89			89
Federal Reserve Bank stock	85			85
Recurring [Member]
Fair value of warrants	3
Transfers into or out of Level 1 or Level 2 or Level 3	0		0
Total liabilities at fair value	451			497
Nonrecurring [Member]
Total liabilities at fair value	0			0
Estimated Fair Value [Member]
Carrying value of nonmarketable equity securities	20	[1]		22	[1]
Carrying Amount [Member]
Carrying value of nonmarketable equity securities	13	[1]		13	[1]
Carrying value of loan servicing rights	$ 2

[1] Included $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at both March 31, 2013 and December 31, 2012.

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Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	$ 62		$ 53
Recorded investment in impaired loans with related allowance	335		366
Recorded investment total impaired loans	397		419
Unpaid principal balance	624		638
Related allowance for loan losses	60		76
Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	20		2
Recorded investment in impaired loans with related allowance	335		366
Recorded investment total impaired loans	355		368
Unpaid principal balance	568		570
Related allowance for loan losses	60		76
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	11		2
Recorded investment in impaired loans with related allowance	98		117
Recorded investment total impaired loans	109		119
Unpaid principal balance	201		207
Related allowance for loan losses	22		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	28		26
Recorded investment total impaired loans	28		26
Unpaid principal balance	42		32
Related allowance for loan losses	4		4
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	28	[1]	26	[1]
Recorded investment total impaired loans	28	[1]	26	[1]
Unpaid principal balance	41	[1]	31	[1]
Related allowance for loan losses	4	[1]	4	[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]	0	[2]
Recorded investment total impaired loans	0	[2]	0	[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	9		0
Recorded investment in impaired loans with related allowance	209		221
Recorded investment total impaired loans	218		221
Unpaid principal balance	325		326
Related allowance for loan losses	34		46
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	4	[1]	0	[1]
Recorded investment in impaired loans with related allowance	89	[1]	99	[1]
Recorded investment total impaired loans	93	[1]	99	[1]
Unpaid principal balance	151	[1]	159	[1]
Related allowance for loan losses	12	[1]	18	[1]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	5	[2]	0	[2]
Recorded investment in impaired loans with related allowance	120	[2]	122	[2]
Recorded investment total impaired loans	125	[2]	122	[2]
Unpaid principal balance	174	[2]	167	[2]
Related allowance for loan losses	22	[2]	28	[2]
Business loans | Lease financing
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	0		0
Recorded investment in impaired loans with related allowance	0		2
Recorded investment total impaired loans	0		2
Unpaid principal balance	0		5
Related allowance for loan losses	0		0
Business loans | International
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance			0
Recorded investment in impaired loans with related allowance			0
Recorded investment total impaired loans			0
Unpaid principal balance			0
Related allowance for loan losses			0
Retail loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	42	[3]	51	[3]
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	42		51
Unpaid principal balance	56		68
Related allowance for loan losses	0		0
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	34		39
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	34		39
Unpaid principal balance	40		48
Related allowance for loan losses	0		0
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	8		12
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	8		12
Unpaid principal balance	16		20
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	4		8
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	4		8
Unpaid principal balance	6		10
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	10		10
Related allowance for loan losses	$ 0		$ 0

[1] Primarily loans to real estate investors and 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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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2013

Accounting Policies [Abstract]

Allowance for Loan Losses [Policy Text Block]

Allowance for Loan Losses

The allowance for loan losses represents management’s assessment of probable, estimable losses inherent in the Corporation’s loan portfolio. The allowance for loan losses includes specific allowances, based on individual evaluations of certain loans, and allowances for homogeneous pools of loans with similar risk characteristics.

The allowance for business loans which do not meet the criteria to be evaluated individually is determined by applying standard reserve factors to the pool of business loans within each internal risk rating. In the first quarter 2013, the Corporation enhanced the approach utilized for determining standard reserve factors by changing from a dollar-based migration method for developing probability of default statistics to a count-based method. Under the dollar-based method, each dollar that moved to default received equal weight in the determination of standard reserve factors for each internal risk rating. As a result, the movement of larger loans impacted standard reserve factors more than the movement of smaller loans. By moving to a count-based approach, where each loan that moves to default receives equal weighting, unusually large or small loans will not have a disproportionate influence on the standard reserve factors. The change resulted in a $40 million increase to the allowance for loan losses at March 31, 2013.

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Derivative And Credit-Related Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

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, 2013 and December 31, 2012. 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, 2013								December 31, 2012
			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	$	272		$	—		$	1,450	$	290		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	455		1			1			475		1			—
Total risk management purposes	1,905		273			1			1,925		291			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	564		—			3			545		—			3
Caps and floors purchased	564		3			—			545		3			—
Swaps	11,061		237			193			10,952		263			215
Total interest rate contracts	12,189		240			196			12,042		266			218
Energy contracts:
Caps and floors written	1,875		—			85			1,873		—			112
Caps and floors purchased	1,875		85			—			1,873		112			—
Swaps	2,441		57			55			1,815		61			60
Total energy contracts	6,191		142			140			5,561		173			172
Foreign exchange contracts:
Spot, forwards, options and swaps	2,012		21			22			2,253		20			18
Total customer-initiated and other activities	20,392		403			358			19,856		459			408
Total gross derivatives	$	22,297	676			359			$	21,781	750			408
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(252		)	(252		)			(279		)	(279		)
Netting adjustment - Cash collateral received/posted			(82		)	(2		)			(11		)	—
Net derivatives included in the consolidated balance sheets (b)			342			105					460			129
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(74		)	(45		)			(180		)	(56		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	268		$	60				$	280		$	73

(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 $5 million and $4 million at March 31, 2013 and December 31, 2012, respectively.

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, 2013 and December 31, 2012.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
March 31, 2013
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	1,450	4.2	5.45	%	0.51	%
December 31, 2012
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,450		4.4	5.45		0.62

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at March 31, 2013 and December 31, 2012.

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	2013		2012
Interest rate contracts	Other noninterest income	$	3	$	2
Energy contracts	Other noninterest income	1		1
Foreign exchange contracts	Foreign exchange income	9		9
Total		$	13	$	12

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, 2013		December 31, 2012
Unused commitments to extend credit:
Commercial and other	$	26,683	$	25,659
Bankcard, revolving check credit and home equity loan commitments	1,687		1,681
Total unused commitments to extend credit	$	28,370	$	27,340
Standby letters of credit	$	4,908	$	4,985
Commercial letters of credit	60		78
Other credit-related financial instruments	1		1

Summary Of Internally Classified Watch List Letters Of Credit

The following table presents a summary of internally classified watch list standby and commercial letters of credit at March 31, 2013 and December 31, 2012. The Corporation's internal watch 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, 2013			December 31, 2012
Total watch list standby and commercial letters of credit	$	142		$	144
As a percentage of total outstanding standby and commercial letters of credit	2.9		%	2.9		%

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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, 2013		Mar. 31, 2012		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses	$ 16		$ 22
Total allowance for loan losses	617				629
PCI loans	29				36
Total loans	45,067				46,057
Allowance for PCI loans	0				0
Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	41,343				42,377
Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3,724				3,680
Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	629		726
Loan charge-offs	(38)		(62)
Recoveries on loans previously charged-off	14		17
Net loan charge-offs	(24)		(45)
Provision for loan losses	12		23
Balance at end of period	617		704
As a percentage of total loans	1.37%		1.64%
Allowance for loan losses individually evaluated for impairment	60		144
Allowance for loan losses collectively evaluated for impairment	557		560
Loans individually evaluated for impairment	397		752
Loans collectively evaluated for impairment	44,641		42,188
PCI loans	29	[1]	72	[1]
Total loans	45,067		43,012
Financing Receivable [Member] | Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	552		648
Loan charge-offs	(34)		(55)
Recoveries on loans previously charged-off	12		14
Net loan charge-offs	(22)		(41)
Provision for loan losses	14		25
Balance at end of period	544		632
As a percentage of total loans	1.32%		1.61%
Allowance for loan losses individually evaluated for impairment	60		143
Allowance for loan losses collectively evaluated for impairment	484		489
Loans individually evaluated for impairment	355		702
Loans collectively evaluated for impairment	40,964		38,523
PCI loans	24	[1]	64	[1]
Total loans	41,343		39,289
Financing Receivable [Member] | Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	77		78
Loan charge-offs	(4)		(7)
Recoveries on loans previously charged-off	2		3
Net loan charge-offs	(2)		(4)
Provision for loan losses	(2)		(2)
Balance at end of period	73		72
As a percentage of total loans	1.97%		1.94%
Allowance for loan losses individually evaluated for impairment	0		1
Allowance for loan losses collectively evaluated for impairment	73		71
Loans individually evaluated for impairment	42		50
Loans collectively evaluated for impairment	3,677		3,665
PCI loans	5	[1]	8	[1]
Total loans	$ 3,724		$ 3,723

[1] No allowance for loan losses was required for PCI loans at March 31, 2013 and 2012.

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Investment Securities (Summary Of Investment Securities Available-For-Sale) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Amortized Cost	$ 10,067		$ 10,060
Gross Unrealized Gains	230		248
Gross Unrealized Losses	11		11
Total investment securities available-for-sale, Fair Value	10,286		10,297
U.S. Treasury and Other U.S. Government Agency Securities
Amortized Cost	20		20
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Total investment securities available-for-sale, Fair Value	20		20
Residential Mortgage-Backed Securities [Member]
Amortized Cost	9,684	[1]	9,687	[1]
Gross Unrealized Gains	230	[1]	248	[1]
Gross Unrealized Losses	1	[1]	0	[1]
Total investment securities available-for-sale, Fair Value	9,913	[1]	9,935	[1]
State And Municipal Securities [Member]
Amortized Cost	27	[2]	27	[2]
Gross Unrealized Gains	0	[2]	0	[2]
Gross Unrealized Losses	4	[2]	4	[2]
Total investment securities available-for-sale, Fair Value	23	[2]	23	[2]
Auction-Rate Debt Securities [Member]
Amortized Cost	1		1
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Total investment securities available-for-sale, Fair Value	1		1
Other Corporate Debt Securities [Member]
Amortized Cost	56		57
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Total investment securities available-for-sale, Fair Value	56		57
Auction-Rate Preferred Securities [Member]
Amortized Cost	159		163
Gross Unrealized Gains	0		0
Gross Unrealized Losses	6		7
Total investment securities available-for-sale, Fair Value	153		156
Money Market And Other Mutual Funds [Member]
Amortized Cost	120		105
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Total investment securities available-for-sale, Fair Value	$ 120		$ 105

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

[2] Primarily auction-rate securities.

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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, 2011	$ 6,868	$ 1,141	$ 2,170	$ (356)	$ 5,546	$ (1,633)
BALANCE (in shares) at Dec. 31, 2011		197.3
Net income	130				130
Other comprehensive income, net of tax	30			30
Cash dividends declared on common stock	(20)				(20)
Purchase of common stock	(36)					(36)
Purchase of common stock (in shares)		(1.2)
Net issuance of common stock under employee stock plans	0		(32)		(26)	58
Net issuance of common stock under employee stock plans (in shares)		1.1
Share-based compensation	13		13
Other	0		3			(3)
Other (in shares)		(0.1)
BALANCE at Mar. 31, 2012	6,985	1,141	2,154	(326)	5,630	(1,614)
BALANCE (in shares) at Mar. 31, 2012		197.1
BALANCE at Dec. 31, 2012	6,942	1,141	2,162	(413)	5,931	(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	$ 6,988	$ 1,141	$ 2,157	$ (410)	$ 6,020	$ (1,920)
BALANCE (in shares) at Mar. 31, 2013		186.8

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Investment Securities

3 Months Ended

Mar. 31, 2013

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, 2013
U.S. Treasury and other U.S. government agency securities	$	20	$	—	$	—	$	20
Residential mortgage-backed securities (a)	9,684		230		1		9,913
State and municipal securities (b)	27		—		4		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	56		—		—		56
Equity and other non-debt securities:
Auction-rate preferred securities	159		—		6		153
Money market and other mutual funds	120		—		—		120
Total investment securities available-for-sale	$	10,067	$	230	$	11	$	10,286
December 31, 2012
U.S. Treasury and other U.S. government agency securities	$	20	$	—	$	—	$	20
Residential mortgage-backed securities (a)	9,687		248		—		9,935
State and municipal securities (b)	27		—		4		23
Corporate debt securities:
Auction-rate debt securities	1		—		—		1
Other corporate debt securities	57		—		—		57
Equity and other non-debt securities:
Auction-rate preferred securities	163		—		7		156
Money market and other mutual funds	105		—		—		105
Total investment securities available-for-sale	$	10,060	$	248	$	11	$	10,297

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

(b) Primarily auction-rate securities.

A summary of the Corporation’s investment securities available-for-sale in an unrealized loss position as of March 31, 2013 and December 31, 2012 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, 2013
Residential mortgage-backed securities (a)	$	233	$	1	$	—	$	—		$	233	$	1
State and municipal securities (b)	—		—		23		4			23		4
Corporate debt securities:
Auction-rate debt securities	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities:
Auction-rate preferred securities	—		—		153		6			153		6
Total impaired securities	$	233	$	1	$	177	$	10		$	410	$	11
December 31, 2012
State and municipal securities (b)	$	—	$	—	$	23	$	4		$	23	$	4
Corporate debt securities:
Auction-rate debt securities	—		—		1		—		(c)	1		—		(c)
Equity and other non-debt securities:
Auction-rate preferred securities	—		—		156		7			156		7
Total impaired securities	$	—	$	—	$	180	$	11		$	180	$	11

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

(b) Primarily auction-rate securities.

(c) Unrealized losses less than $0.5 million.

At March 31, 2013, the Corporation had 87 securities in an unrealized loss position with no credit impairment, including 50 auction-rate preferred securities, 22 state and municipal auction-rate securities, 14 residential mortgage-backed securities and one auction-rate debt security. As of March 31, 2013, approximately 85 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, 2013.

Sales, calls and write-downs of investment securities available-for-sale resulted in gains of $5 million and no losses for the three months ended March 31, 2012. 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, 2013	Amortized Cost		Fair Value
Contractual maturity
Within one year	$	81	$	81
After one year through five years	419		425
After five years through ten years	114		113
After ten years	9,174		9,394
Subtotal	9,788		10,013
Equity and other nondebt securities:
Auction-rate preferred securities	159		153
Money market and other mutual funds	120		120
Total investment securities available-for-sale	$	10,067	$	10,286

Included in the contractual maturity distribution in the table above were auction-rate securities with a total amortized cost and fair value of $28 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 a total amortized cost and fair value of $9.7 billion and $9.9 billion, respectively. 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, 2013, investment securities with a carrying value of $3.0 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 Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Notional/Contract Amount	$ 22,297	[1]	$ 21,781	[1]
Fair Value of Gross Derivative Assets	676		750
Fair Value of Gross Derivative Liabilities	359		408
Derivative Asset, Netting Adjustment - Offsetting Liabilities	(252)		(279)
Derivative Liability, Netting Adjustment - Offsetting Assets	(252)		(279)
Derivative Asset, Netting Adjustment - Amount Offset Against Collateral	(82)		(11)
Derivative Liability, Netting Adjustment - Amount Offset Against Collateral	(2)		0
Fair Value of Net Derivative Assets	342	[2]	460	[2]
Fair Value of Net Derivative Liabilities	105	[2]	129	[2]
Derivative Asset, Amount Not Offset Against Collateral	(74)		(180)
Derivative Liability, Amount Not Offset Against Collateral	(45)		(56)
Net Derivative Assets After Deducting Amounts not Offset	268		280
Net Derivative Liabilities After Deductinig Amounts not Offset	60		73
Derivative Credit Risk Valuation Adjustment, Derivative Assets	5		4
Risk Management Purposes [Member]
Notional/Contract Amount	1,905	[1]	1,925	[1]
Fair Value of Gross Derivative Assets	273		291
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]
Notional/Contract Amount	1,450	[1]	1,450	[1]
Fair Value of Gross Derivative Assets	272		290
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]
Notional/Contract Amount	455	[1]	475	[1]
Fair Value of Gross Derivative Assets	1		1
Fair Value of Gross Derivative Liabilities	1		0
Customer-Initiated And Other Activities [Member]
Notional/Contract Amount	20,392	[1]	19,856	[1]
Fair Value of Gross Derivative Assets	403		459
Fair Value of Gross Derivative Liabilities	358		408
Customer-Initiated And Other Activities [Member] | Interest Rate Contracts [Member]
Notional/Contract Amount	12,189	[1]	12,042	[1]
Fair Value of Gross Derivative Assets	240		266
Fair Value of Gross Derivative Liabilities	196		218
Customer-Initiated And Other Activities [Member] | Interest Rate Caps And Floors Written [Member]
Notional/Contract Amount	564	[1]	545	[1]
Fair Value of Gross Derivative Assets	0		0
Fair Value of Gross Derivative Liabilities	3		3
Customer-Initiated And Other Activities [Member] | Interest Rate Caps and Floors Purchased [Member]
Notional/Contract Amount	564	[1]	545	[1]
Fair Value of Gross Derivative Assets	3		3
Fair Value of Gross Derivative Liabilities	0		0
Customer-Initiated And Other Activities [Member] | Interest Rate Swap [Member]
Notional/Contract Amount	11,061	[1]	10,952	[1]
Fair Value of Gross Derivative Assets	237		263
Fair Value of Gross Derivative Liabilities	193		215
Customer-Initiated And Other Activities [Member] | Energy Contracts [Member]
Notional/Contract Amount	6,191	[1]	5,561	[1]
Fair Value of Gross Derivative Assets	142		173
Fair Value of Gross Derivative Liabilities	140		172
Customer-Initiated And Other Activities [Member] | Energy Caps and Floors Written [Member]
Notional/Contract Amount	1,875	[1]	1,873	[1]
Fair Value of Gross Derivative Assets	0		0
Fair Value of Gross Derivative Liabilities	85		112
Customer-Initiated And Other Activities [Member] | Energy Caps and Floors Purchased [Member]
Notional/Contract Amount	1,875	[1]	1,873	[1]
Fair Value of Gross Derivative Assets	85		112
Fair Value of Gross Derivative Liabilities	0		0
Customer-Initiated And Other Activities [Member] | Energy Swaps [Member]
Notional/Contract Amount	2,441	[1]	1,815	[1]
Fair Value of Gross Derivative Assets	57		61
Fair Value of Gross Derivative Liabilities	55		60
Customer-Initiated And Other Activities [Member] | Foreign Exchange Spot, Forwards, Options and Swaps [Member]
Notional/Contract Amount	2,012	[1]	2,253	[1]
Fair Value of Gross Derivative Assets	21		20
Fair Value of Gross Derivative Liabilities	$ 22		$ 18

[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 $5 million and $4 million at March 31, 2013 and December 31, 2012, respectively.

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Net Income Per Common Share (Schedule of Average Shares Excluded From Diluted Net Income Per Common Share Computation) (Details) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding securities	15.1	17.6
Stock Options | Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	34.78	30.77
Stock Options | Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	61.94	64.50
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding securities		0.6
Exercise price		30.36

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Variable Interest Entities (VIEs) (Tables)

3 Months Ended

Mar. 31, 2013

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 VIEs on line items on the Corporation’s consolidated statements of comprehensive income.

	Three Months Ended March 31,
(in millions)	2013			2012
Other noninterest income	$	(14	)	$	(14	)
Benefit for income taxes (a)	(14		)	(14		)

(a) Income tax credits from low income housing tax credit/historic rehabilitation tax credit partnerships.

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Business Segment Information (Business Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Net interest income (expense) (FTE)	$ 416		$ 443
Provision for credit losses	16		22
Noninterest income	200		206
Noninterest expenses	416		448
Provision (benefit) for income taxes (FTE)	50		49
Net income (loss)	134		130
Net credit-related charge-offs	24		45
Assets, average	63,451		61,345
Loans, average	44,617		42,269
Deposits, average	50,692		48,311
Return on average assets	0.84%	[1]	0.85%	[1]
Efficiency ratio	67.58%	[2]	69.70%	[2]
Business Bank
Net interest income (expense) (FTE)	375		373
Provision for credit losses	20		2
Noninterest income	77		81
Noninterest expenses	146		158
Provision (benefit) for income taxes (FTE)	88		91
Net income (loss)	198		203
Net credit-related charge-offs	16		28
Assets, average	35,780		33,178
Loans, average	34,753		32,238
Deposits, average	25,514		23,997
Return on average assets	2.19%	[1]	2.45%	[1]
Efficiency ratio	32.30%	[2]	34.86%	[2]
Retail Bank
Net interest income (expense) (FTE)	155		167
Provision for credit losses	6		6
Noninterest income	41		42
Noninterest expenses	175		183
Provision (benefit) for income taxes (FTE)	5		7
Net income (loss)	10		13
Net credit-related charge-offs	8		12
Assets, average	5,973		6,173
Loans, average	5,276		5,462
Deposits, average	21,049		20,373
Return on average assets	0.18%	[1]	0.25%	[1]
Efficiency ratio	89.37%	[2]	87.54%	[2]
Wealth Management
Net interest income (expense) (FTE)	46		47
Provision for credit losses	(6)		12
Noninterest income	65		65
Noninterest expenses	79		80
Provision (benefit) for income taxes (FTE)	13		7
Net income (loss)	25		13
Net credit-related charge-offs	0		5
Assets, average	4,738		4,636
Loans, average	4,588		4,569
Deposits, average	3,682		3,611
Return on average assets	2.12%	[1]	1.07%	[1]
Efficiency ratio	71.09%	[2]	75.00%	[2]
Finance
Net interest income (expense) (FTE)	(167)		(152)
Provision for credit losses	0		0
Noninterest income	14		13
Noninterest expenses	3		3
Provision (benefit) for income taxes (FTE)	(58)		(54)
Net income (loss)	(98)		(88)
Net credit-related charge-offs	0		0
Assets, average	11,747		11,827
Loans, average	0		0
Deposits, average	275		161
Other
Net interest income (expense) (FTE)	7		8
Provision for credit losses	(4)		2
Noninterest income	3		5
Noninterest expenses	13		24
Provision (benefit) for income taxes (FTE)	2		(2)
Net income (loss)	(1)		(11)
Net credit-related charge-offs	0		0
Assets, average	5,213		5,531
Loans, average	0		0
Deposits, average	$ 172		$ 169

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

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

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Fair Value Measurements (Quantitative Information About Level 3 Measurements) (Details) (Recurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	11,069		11,164
Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	180		183
State And Municipal Securities [Member] | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	23	[1]	23	[1]
State And Municipal Securities [Member] | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	6.00%	[1]	6.00%	[1]
Unobservable Input, Workout period	4 years	[1]	4 years	[1]
State And Municipal Securities [Member] | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	10.00%	[1]	10.00%	[1]
Unobservable Input, Workout period	6 years	[1]	6 years	[1]
Auction-Rate Preferred Securities [Member] | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets at fair value	153		156
Auction-Rate Preferred Securities [Member] | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	4.00%		4.00%
Unobservable Input, Workout period	2 years		2 years
Auction-Rate Preferred Securities [Member] | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	6.00%		6.00%
Unobservable Input, Workout period	5 years		4 years

[1] Primarily auction-rate securities.

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Business Segment Information

3 Months Ended

Mar. 31, 2013

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.

In the first quarter 2013, the Corporation changed the method of assigning the allowance for loan losses to each business segment. In 2012, national probability of default and loss given default statistics were incorporated into the Corporation's allowance methodology. Each business segment was assigned an allowance for loan losses based on market-specific standard reserve factors applied to the loans in each segment, and the difference between the total allowance required on a national basis and the market-specific allowances was allocated based on the relative loan balances in each segment. Effective first quarter 2013, each segment is assigned an allowance for loan losses by applying national standard reserve factors to the loan balances in each segment by risk rating distribution. For comparability purposes, amounts in all periods are based on business segments and methodologies in effect at March 31, 2013.

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 2012 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, 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	77			41			65			14			3			200
Noninterest expenses	146			175			79			3			13			416
Provision (benefit) for income taxes (FTE)	88			5			13			(58		)	2			50
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)	2.19		%	0.18		%	2.12		%	N/M			N/M			0.84		%
Efficiency ratio (b)	32.30			89.37			71.09			N/M			N/M			67.58

(Table continues on following page).

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Three Months Ended March 31, 2012
Earnings summary:
Net interest income (expense) (FTE)	$	373		$	167		$	47		$	(152	)	$	8		$	443
Provision for credit losses	2			6			12			—			2			22
Noninterest income	81			42			65			13			5			206
Noninterest expenses	158			183			80			3			24			448
Provision (benefit) for income taxes (FTE)	91			7			7			(54		)	(2		)	49
Net income (loss)	$	203		$	13		$	13		$	(88	)	$	(11	)	$	130
Net credit-related charge-offs	$	28		$	12		$	5		$	—		$	—		$	45
Selected average balances:
Assets	$	33,178		$	6,173		$	4,636		$	11,827		$	5,531		$	61,345
Loans	32,238			5,462			4,569			—			—			42,269
Deposits	23,997			20,373			3,611			161			169			48,311
Statistical data:
Return on average assets (a)	2.45		%	0.25		%	1.07		%	N/M			N/M			0.85		%
Efficiency ratio (b)	34.86			87.54			75.00			N/M			N/M			69.70

(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, 2013.

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, 2013
Earnings summary:
Net interest income (expense) (FTE)	$	189		$	171		$	135		$	81		$	(160	)	$	416
Provision for credit losses	(8		)	21			8			(1		)	(4		)	16
Noninterest income	92			35			31			25			17			200
Noninterest expenses	168			97			91			44			16			416
Provision (benefit) for income taxes (FTE)	44			32			23			7			(56		)	50
Net income (loss)	$	77		$	56		$	44		$	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	20,255			14,356			9,959			5,675			447			50,692
Statistical data:
Return on average assets (a)	1.45		%	1.45		%	1.53		%	2.85		%	N/M			0.84		%
Efficiency ratio (b)	59.53			47.04			54.99			42.11			N/M			67.58

(Table continues on following page).

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended March 31, 2012
Earnings summary:
Net interest income (expense) (FTE)	$	196		$	165		$	150		$	76		$	(144	)	$	443
Provision for credit losses	(3		)	(3		)	25			1			2			22
Noninterest income	98			33			31			26			18			206
Noninterest expenses	179			99			93			50			27			448
Provision (benefit) for income taxes (FTE)	40			38			22			5			(56		)	49
Net income (loss)	$	78		$	64		$	41		$	46		$	(99	)	$	130
Net credit-related charge-offs	$	18		$	11		$	7		$	9		$	—		$	45
Selected average balances:
Assets	$	14,092		$	12,310		$	10,080		$	7,505		$	17,358		$	61,345
Loans	13,829			12,096			9,295			7,049			—			42,269
Deposits	19,415			13,688			10,229			4,649			330			48,311
Statistical data:
Return on average assets (a)	1.53		%	1.74		%	1.43		%	2.43		%	N/M			0.85		%
Efficiency ratio (b)	60.88			50.50			51.10			51.93			N/M			69.70

(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