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 June 30, 2015

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 July 24, 2015: 177,928,704 shares

COMERICA INCORPORATED AND SUBSIDIARIES

TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION
ITEM 1. Financial Statements
Consolidated Balance Sheets at June 30, 2015 (unaudited) and December 31, 2014	1
Consolidated Statements of Comprehensive Income for the Three and Six Months Ended June 30, 2015 and 2014 (unaudited)	2
Consolidated Statements of Changes in Shareholders’ Equity for the Six Months Ended June 30, 2015 and 2014 (unaudited)	3
Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2015 and 2014 (unaudited)	4
Notes to Consolidated Financial Statements (unaudited)	5
ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	38
ITEM 3. Quantitative and Qualitative Disclosures about Market Risk	65
ITEM 4. Controls and Procedures	65
PART II. OTHER INFORMATION
ITEM 1. Legal Proceedings	65
ITEM 1A. Risk Factors	65
ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds	65
ITEM 6. Exhibits	66
Signature	67

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements

CONSOLIDATED BALANCE SHEETS

Comerica Incorporated and Subsidiaries

(in millions, except share data)	June 30, 2015			December 31, 2014
	(unaudited)
ASSETS
Cash and due from banks	$	1,148		$	1,026
Interest-bearing deposits with banks	4,817			5,045
Other short-term investments	119			99
Investment securities available-for-sale	8,267			8,116
Investment securities held-to-maturity	1,952			1,935
Commercial loans	32,723			31,520
Real estate construction loans	1,795			1,955
Commercial mortgage loans	8,674			8,604
Lease financing	786			805
International loans	1,420			1,496
Residential mortgage loans	1,865			1,831
Consumer loans	2,478			2,382
Total loans	49,741			48,593
Less allowance for loan losses	(618		)	(594		)
Net loans	49,123			47,999
Premises and equipment	541			532
Accrued income and other assets	3,978			4,434
Total assets	$	69,945		$	69,186
LIABILITIES AND SHAREHOLDERS’ EQUITY
Noninterest-bearing deposits	$	28,167		$	27,224
Money market and interest-bearing checking deposits	23,786			23,954
Savings deposits	1,841			1,752
Customer certificates of deposit	4,367			4,421
Foreign office time deposits	99			135
Total interest-bearing deposits	30,093			30,262
Total deposits	58,260			57,486
Short-term borrowings	56			116
Accrued expenses and other liabilities	1,265			1,507
Medium- and long-term debt	2,841			2,675
Total liabilities	62,422			61,784
Common stock - $5 par value:
Authorized - 325,000,000 shares
Issued - 228,164,824 shares	1,141			1,141
Capital surplus	2,158			2,188
Accumulated other comprehensive loss	(396		)	(412		)
Retained earnings	6,908			6,744
Less cost of common stock in treasury - 49,803,515 shares at 6/30/15 and 49,146,225 shares at 12/31/14	(2,288		)	(2,259		)
Total shareholders’ equity	7,523			7,402
Total liabilities and shareholders’ equity	$	69,945		$	69,186

See notes to consolidated financial statements.

1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited)

Comerica Incorporated and Subsidiaries 

	Three Months Ended June 30,					Six Months Ended June 30,
(in millions, except per share data)	2015			2014		2015			2014
INTEREST INCOME
Interest and fees on loans	$	389		$	385	$	767		$	761
Interest on investment securities	52			53		105			108
Interest on short-term investments	3			3		7			7
Total interest income	444			441		879			876
INTEREST EXPENSE
Interest on deposits	11			11		22			22
Interest on medium- and long-term debt	12			14		23			28
Total interest expense	23			25		45			50
Net interest income	421			416		834			826
Provision for credit losses	47			11		61			20
Net interest income after provision for credit losses	374			405		773			806
NONINTEREST INCOME
Service charges on deposit accounts	56			54		111			108
Fiduciary income	48			45		95			89
Commercial lending fees	22			23		47			43
Card fees	72			22		139			45
Letter of credit fees	13			15		26			29
Bank-owned life insurance	10			11		19			20
Foreign exchange income	9			12		19			21
Brokerage fees	5			4		9			9
Net securities (losses) gains	—			—		(2		)	1
Other noninterest income	26			34		53			63
Total noninterest income	261			220		516			428
NONINTEREST EXPENSES
Salaries and benefits expense	251			240		504			487
Net occupancy expense	39			39		77			79
Equipment expense	13			15		26			29
Outside processing fee expense	85			30		162			58
Software expense	24			25		47			47
Litigation-related expense	(30		)	3		(29		)	6
FDIC insurance expense	9			8		18			16
Advertising expense	6			5		12			11
Other noninterest expenses	39			39		78			77
Total noninterest expenses	436			404		895			810
Income before income taxes	199			221		394			424
Provision for income taxes	64			70		125			134
NET INCOME	135			151		269			290
Less income allocated to participating securities	1			2		3			4
Net income attributable to common shares	$	134		$	149	$	266		$	286
Earnings per common share:
Basic	$	0.76		$	0.83	$	1.51		$	1.59
Diluted	0.73			0.80		1.46			1.54
Comprehensive income	109			172		285			377
Cash dividends declared on common stock	37			36		73			71
Cash dividends declared per common share	0.21			0.20		0.41			0.39

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, 2013	182.3		$	1,141	$	2,179		$	(391	)	$	6,318		$	(2,097	)	$	7,150
Net income	—		—		—			—			290			—			290
Other comprehensive income, net of tax	—		—		—			87			—			—			87
Cash dividends declared on common stock ($0.39 per share)	—		—		—			—			(71		)	—			(71		)
Purchase of common stock	(3.0	)	—		—			—			—			(141		)	(141		)
Net issuance of common stock under employee stock plans	1.6		—		(25		)	—			(17		)	74			32
Share-based compensation	—		—		22			—			—			—			22
Other	—		—		(1		)	—			—			1			—
BALANCE AT JUNE 30, 2014	180.9		$	1,141	$	2,175		$	(304	)	$	6,520		$	(2,163	)	$	7,369
BALANCE AT DECEMBER 31, 2014	179.0		$	1,141	$	2,188		$	(412	)	$	6,744		$	(2,259	)	$	7,402
Net income	—		—		—			—			269			—			269
Other comprehensive income, net of tax	—		—		—			16			—			—			16
Cash dividends declared on common stock ($0.41 per share)	—		—		—			—			(73		)	—			(73		)
Purchase of common stock	(2.5	)	—		—			—			—			(115		)	(115		)
Purchase and retirement of warrants	—		—		(10		)	—			—			—			(10		)
Net issuance of common stock under employee stock plans	0.9		—		(23		)	—			(10		)	43			10
Net issuance of common stock for warrants	1.0		—		(21		)	—			(22		)	43			—
Share-based compensation	—		—		24			—			—			—			24
BALANCE AT JUNE 30, 2015	178.4		$	1,141	$	2,158		$	(396	)	$	6,908		$	(2,288	)	$	7,523

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)

Comerica Incorporated and Subsidiaries

	Six Months Ended June 30,
(in millions)	2015			2014
OPERATING ACTIVITIES
Net income	$	269		$	290
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	61			20
Benefit for deferred income taxes	(25		)	(13		)
Depreciation and amortization	60			61
Net periodic defined benefit cost	23			19
Share-based compensation expense	24			22
Net amortization of securities	8			5
Accretion of loan purchase discount	(4		)	(22		)
Net securities losses (gains)	2			(1		)
Net gains on sales of foreclosed property	(1		)	(2		)
Excess tax benefits from share-based compensation arrangements	(3		)	(6		)
Net change in:
Trading securities	—			5
Accrued income receivable	(4		)	(1		)
Accrued expenses payable	(83		)	(60		)
Other, net	67			29
Net cash provided by operating activities	394			346
INVESTING ACTIVITIES
Investment securities available-for-sale:
Maturities and redemptions	842			825
Sales	37			—
Purchases	(1,055		)	(940		)
Investment securities held-to-maturity:
Maturities and redemptions	153			—
Purchases	(166		)	—
Net change in loans	(1,188		)	(2,422		)
Proceeds from sales of foreclosed property	5			9
Net increase in premises and equipment	(54		)	(31		)
Sales of Federal Home Loan Bank stock	—			41
Other, net	2			1
Net cash used in investing activities	(1,424		)	(2,517		)
FINANCING ACTIVITIES
Net change in:
Deposits	971			763
Short-term borrowings	(60		)	(77		)
Medium- and long-term debt:
Maturities and redemptions	(306		)	(1,256		)
Issuances	497			349
Common stock:
Repurchases	(115		)	(141		)
Cash dividends paid	(72		)	(65		)
Issuances under employee stock plans	18			36
Purchase and retirement of warrants	(10		)	—
Excess tax benefits from share-based compensation arrangements	3			6
Other, net	(2		)	(1		)
Net cash provided by (used in) financing activities	924			(386		)
Net decrease in cash and cash equivalents	(106		)	(2,557		)
Cash and cash equivalents at beginning of period	6,071			6,451
Cash and cash equivalents at end of period	$	5,965		$	3,894
Interest paid	$	45		$	50
Income tax (refunds received) paid	(11		)	110
Noncash investing and financing activities:
Loans transferred to other real estate	4			11
Loans transferred from portfolio to held-for-sale	19			—

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 six months ended June 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. 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, 2014.

Revenue Recognition

In the first quarter 2015, the Corporation entered into a new contract for an existing debit card program. Guidance provided in Accounting Standards Code 605-45, "Principal Agent Considerations," indicates whether revenue should be reported gross or net for this type of arrangement. Management assessed various principal versus agent indicators provided in the guidance and concluded that the Corporation bears the risks and rewards of providing the services for the card program based on the new contract terms and, therefore, gross presentation of revenues and expenses is appropriate. This change in presentation resulted in increases of $44 million and $88 million to both "card fees" in noninterest income and "outside processing fee expense" in noninterest expenses for the three- and six-month periods ended June 30, 2015, respectively.

Recently Adopted Accounting Pronouncements

Effective January 1, 2015, the Corporation prospectively adopted Accounting Standards Update (ASU) No. 2014-04, “Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure,” (ASU 2014-04), which clarifies when an in-substance foreclosure or repossession of residential real estate property occurs, requiring a creditor to reclassify the loan to other real estate. According to ASU 2014-04, a consumer mortgage loan should be reclassified to other real estate either upon the creditor obtaining legal title to the real estate collateral or when the borrower voluntarily conveys all interest in the real estate property to the creditor through a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also clarifies that a creditor that has obtained legal title to a foreclosed property should not delay reclassification when a borrower has a legal right of redemption for a period of time. The Corporation's existing accounting treatment is consistent with the new guidance, and therefore the adoption of ASU 2014-04 had no impact to the Corporation's financial condition and results of operations. Disclosures required by ASU 2014-04 are provided in Note 4.

Also effective January 1, 2015, the Corporation prospectively adopted ASU No. 2014-12, “Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” (ASU 2014-12). The new guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The Corporation's current accounting treatment of performance conditions for employees who are or become retirement eligible prior to the achievement of the performance target is consistent with ASU 2014-12, and as such the adoption of ASU 2014-12 had no impact to the Corporation’s financial condition and results of operations.

In the second quarter 2015, the Corporation early adopted ASU 2015-03, "Interest - Imputation of Interest (Subtopic 835-30)," which amends the presentation of debt issuance costs in the balance sheet as a direct deduction from the carrying amount of the related debt liability rather than as a deferred charge. The new guidance was retrospectively applied, which resulted in a decrease of $4 million to both "accrued income and other assets" and "medium- and long-term debt" on the consolidated balance sheets as of December 31, 2014. Unamortized debt issuance costs deducted from the carrying amount of medium- and long-term debt totaled $6 million at June 30, 2015.

Pending Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous GAAP comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. The guidance under ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2017 and must be retrospectively applied. Entities will have the option of presenting

5

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

prior periods as impacted by the new guidance or presenting the cumulative effect of initial application along with supplementary disclosures. Early adoption is permitted, but not before annual and interim periods beginning after December 15, 2016. The Corporation is currently evaluating the impact of adopting ASU 2014-09.

In February 2015, the FASB issued ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis," (ASU 2015-02), which makes targeted amendments to the considerations applied by reporting entities when determining if a legal entity should be consolidated, including placing more emphasis on risk of loss when determining a controlling financial interest. Low-income housing tax credit investments that meet the criteria for the proportional amortization method are not impacted by these amendments. ASU 2015-02 is effective for annual and interim periods beginning after December 15, 2015, and must be retrospectively applied. Early adoption is permitted. The Corporation is currently evaluating the impact of adopting ASU 2015-02.

In April 2015, the FASB issued ASU 2015-05, "Goodwill and Other - Internal-Use Software (Subtopic 350-40)," (ASU 2015-05), which defines specific criteria entities must apply to determine if a cloud computing arrangement includes an in-substance software license. The result of the assessment will direct the entity to apply either software licensing or service contract guidance to record the related costs. ASU 2015-05 is effective for annual and interim periods beginning after December 15, 2015, and can be prospectively or retrospectively applied. Early adoption is permitted. The Corporation does not expect the adoption to have a material effect on its financial condition and results of operations.

In May 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent),” (ASU 2015-07) which amends disclosure requirements for entities that utilize net asset value per share (or its equivalent) to measure fair value as a practical expedient. The update eliminates the requirement to classify these investments within the fair value hierarchy and instead requires disclosure of sufficient information about these investments to permit reconciliation of the fair value of investments categorized within the fair value hierarchy to the investments presented in the consolidated balance sheet. ASU 2015-07 is effective for annual and interim periods beginning after December 15, 2015 and must be applied retrospectively. Early adoption is permitted. The adoption of ASU 2015-07 will have no impact on the Corporation's financial condition or results of operations.

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.

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.

Refer to Note 1 to the consolidated financial statements in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2014 for further information about the fair value hierarchy, 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. When credit valuation adjustments are significant to the overall fair value of a derivative, the Corporation classifies the over-the-counter derivative valuation in Level 3 of the fair value hierarchy; otherwise, over-the-counter derivative valuations are classified in Level 2.

6

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 June 30, 2015 and December 31, 2014.

(in millions)	Total		Level 1		Level 2		Level 3
June 30, 2015
Trading securities:
Deferred compensation plan assets	$	94	$	94	$	—	$	—
Equity and other non-debt securities	1		1		—		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	732		732		—		—
Residential mortgage-backed securities (a)	7,262		—		7,262		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	47		—		46		1		(b)
Equity and other non-debt securities	203		132		—		71		(b)
Total investment securities available-for-sale	8,267		864		7,308		95
Derivative assets:
Interest rate contracts	284		—		282		2
Energy derivative contracts	349		—		349		—
Foreign exchange contracts	36		—		36		—
Warrants	3		—		—		3
Total derivative assets	672		—		667		5
Total assets at fair value	$	9,034	$	959	$	7,975	$	100
Derivative liabilities:
Interest rate contracts	$	90	$	—	$	90	$	—
Energy derivative contracts	348		—		348		—
Foreign exchange contracts	31		—		31		—
Other	1		—		—		1
Total derivative liabilities	470		—		469		1
Deferred compensation plan liabilities	94		94		—		—
Total liabilities at fair value	$	564	$	94	$	469	$	1

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

(b) Auction-rate securities.

7

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

(in millions)	Total		Level 1		Level 2		Level 3
December 31, 2014
Trading securities:
Deferred compensation plan assets	$	94	$	94	$	—	$	—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	526		526		—		—
Residential mortgage-backed securities (a)	7,274		—		7,274		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	51		—		50		1		(b)
Equity and other non-debt securities	242		130		—		112		(b)
Total investment securities available-for-sale	8,116		656		7,324		136
Derivative assets:
Interest rate contracts	328		—		328		—
Energy derivative contracts	527		—		527		—
Foreign exchange contracts	39		—		39		—
Warrants	4		—		—		4
Total derivative assets	898		—		894		4
Total assets at fair value	$	9,108	$	750	$	8,218	$	140
Derivative liabilities:
Interest rate contracts	$	102	$	—	$	102	$	—
Energy derivative contracts	525		—		525		—
Foreign exchange contracts	34		—		34		—
Other	1		—		—		1
Total derivative liabilities	662		—		661		1
Deferred compensation plan liabilities	94		94		—		—
Total liabilities at fair value	$	756	$	94	$	661	$	1

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

(b) Auction-rate securities.

There were no transfers of assets or liabilities recorded at fair value on a recurring basis into or out of Level 1, Level 2 and Level 3 fair value measurements during each of the three- and six-month periods ended June 30, 2015 and 2014.

8

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three- and six-month periods ended June 30, 2015 and 2014.

			Net Realized/Unrealized Gains (Losses) (Pretax)
	Balance  at Beginning of Period		Recorded in Earnings								Recorded in Other Comprehensive Income						Balance  at End of  Period
(in millions)			Realized				Unrealized							Sales
Three Months Ended June 30, 2015
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	71		—				—				—			—			71
Total investment securities available-for-sale	95		—				—				—			—			95
Derivative assets:
Interest rate contracts	11		—				(9		)	(d)	—			—			2
Warrants	3		1			(d)	—				—			(1		)	3
Derivative liabilities:
Other	1		—				—				—			—			1
Three Months Ended June 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	118		—				—				1		(b)	(1		)	118
Total investment securities available-for-sale	142		—				—				1		(b)	(1		)	142
Derivative assets:
Warrants	3		4			(d)	—				—			(3		)	4
Derivative liabilities:
Other	2		—				—				—			—			2
Six Months Ended June 30, 2015
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	112		(2		)	(c)	—				1		(b)	(40		)	71
Total investment securities available-for-sale	136		(2		)	(c)	—				1		(b)	(40		)	95
Derivative assets:
Interest rate contracts	—		—				2			(d)	—			—			2
Warrants	4		1			(d)	(1		)	(d)	—			(1		)	3
Derivative liabilities:
Other	1		—				—				—			—			1
Six Months Ended June 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	22	$	—			$	—			$	1	(b)	$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	136		1			(c)	—				6		(b)	(25		)	118
Total investment securities available-for-sale	159		1			(c)	—				7		(b)	(25		)	142
Derivative assets:
Warrants	3		4			(d)	1			(d)	—			(4		)	4
Derivative liabilities:
Other	2		—				—				—			—			2

(a) Auction-rate securities.

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

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

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

9

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 June 30, 2015 and December 31, 2014 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014.

(in millions)	Level 3
June 30, 2015
Loans:
Commercial	$	18
Commercial mortgage	12
International	8
Total loans	38
Nonmarketable equity securities	1
Other real estate	4
Total assets at fair value	$	43
December 31, 2014
Loans:
Commercial	$	38
Commercial mortgage	26
Total loans	64
Nonmarketable equity securities	2
Other real estate	2
Total assets at fair value	$	68

Level 3 assets recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014 included loans for which a specific allowance was established based on the fair value of collateral and other real estate for which fair value of the properties was less than the cost basis. For both asset classes, the unobservable inputs were the additional adjustments applied by management to the appraised values to reflect such factors as non-current appraisals and revisions to estimated time to sell. These adjustments are determined based on qualitative judgments made by management on a case-by-case basis and are not quantifiable inputs, although they are used in the determination of fair value.

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

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
June 30, 2015
State and municipal securities (a)	$	23	3% - 8%	1 - 2
Equity and other non-debt securities (a)	71		4% - 8%	1
December 31, 2014
State and municipal securities (a)	$	23	3% - 9%	1 - 3
Equity and other non-debt securities (a)	112		4% - 8%	1 - 2

(a) Auction-rate securities.

10

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
June 30, 2015
Assets
Cash and due from banks	$	1,148		$	1,148		$	1,148	$	—	$	—
Interest-bearing deposits with banks	4,817			4,817			4,817		—		—
Investment securities held-to-maturity	1,952			1,946			—		1,946		—
Loans held-for-sale	25			25			—		25		—
Total loans, net of allowance for loan losses (a)	49,123			49,009			—		—		49,009
Customers’ liability on acceptances outstanding	8			8			8		—		—
Nonmarketable equity securities (b)	11			18			—		—		18
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	28,167			28,167			—		28,167		—
Interest-bearing deposits	25,726			25,726			—		25,726		—
Customer certificates of deposit	4,367			4,357			—		4,357		—
Total deposits	58,260			58,250			—		58,250		—
Short-term borrowings	56			56			56		—		—
Acceptances outstanding	8			8			8		—		—
Medium- and long-term debt	2,841			2,835			—		2,835		—
Credit-related financial instruments	(95		)	(95		)	—		—		(95		)
December 31, 2014
Assets
Cash and due from banks	$	1,026		$	1,026		$	1,026	$	—	$	—
Interest-bearing deposits with banks	5,045			5,045			5,045		—		—
Investment securities held-to-maturity	1,935			1,933			—		1,933		—
Loans held-for-sale	5			5			—		5		—
Total loans, net of allowance for loan losses (a)	47,999			47,932			—		—		47,932
Customers’ liability on acceptances outstanding	10			10			10		—		—
Nonmarketable equity securities (b)	11			18			—		—		18
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	27,224			27,224			—		27,224		—
Interest-bearing deposits	25,841			25,841			—		25,841		—
Customer certificates of deposit	4,421			4,411			—		4,411		—
Total deposits	57,486			57,476			—		57,476		—
Short-term borrowings	116			116			116		—		—
Acceptances outstanding	10			10			10		—		—
Medium- and long-term debt	2,675			2,681			—		2,681		—
Credit-related financial instruments	(85		)	(85		)	—		—		(85		)

(a) Included $38 million and $64 million of impaired loans recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014, respectively.

(b) Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014, respectively.

11

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

NOTE 3 - INVESTMENT SECURITIES

A summary of the Corporation’s investment securities follows:

(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
June 30, 2015
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	$	729	$	4	$	1	$	732
Residential mortgage-backed securities (a)	7,200		106		44		7,262
State and municipal securities	24		—		1		23
Corporate debt securities	47		—		—		47
Equity and other non-debt securities	201		2		—		203
Total investment securities available-for-sale (b)	$	8,201	$	112	$	46	$	8,267
Investment securities held-to-maturity (c):
Residential mortgage-backed securities (a)	$	1,952	$	2	$	8	$	1,946
December 31, 2014
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	$	526	$	—	$	—	$	526
Residential mortgage-backed securities (a)	7,192		122		40		7,274
State and municipal securities	24		—		1		23
Corporate debt securities	51		—		—		51
Equity and other non-debt securities	242		1		1		242
Total investment securities available-for-sale (b)	$	8,035	$	123	$	42	$	8,116
Investment securities held-to-maturity (c):
Residential mortgage-backed securities (a)	$	1,935	$	—	$	2	$	1,933

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

(b) Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

(c) The amortized cost of investment securities held-to-maturity included net unrealized losses of $19 million at June 30, 2015 and $23 million at December 31, 2014 related to securities transferred to available-for-sale, which are included in accumulated other comprehensive loss.

12

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

A summary of the Corporation’s investment securities in an unrealized loss position as of June 30, 2015 and December 31, 2014 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
June 30, 2015
U.S. Treasury and other U.S. government agency securities	$	212	$	1		$	—	$	—		$	212	$	1
Residential mortgage-backed securities (b)	1,637		15			2,188		59			3,825		74
State and municipal securities (c)	—		—			23		1			23		1
Corporate debt securities (c)	—		—			1		—		(a)	1		—		(a)
Total temporarily impaired securities	$	1,849	$	16		$	2,212	$	60		$	4,061	$	76
December 31, 2014
U.S. Treasury and other U.S. government agency securities	$	298	$	—	(a)	$	—	$	—		$	298	$	—	(a)
Residential mortgage-backed securities (b)	626		3			3,112		71			3,738		74
State and municipal securities (c)	—		—			22		1			22		1
Corporate debt securities (c)	—		—			1		—		(a)	1		—		(a)
Equity and other non-debt securities (c)	—		—			112		1			112		1
Total temporarily impaired securities	$	924	$	3		$	3,247	$	73		$	4,171	$	76

(a) Unrealized losses less than $0.5 million.

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

(c) Auction-rate securities.

At June 30, 2015, the Corporation had 112 securities in an unrealized loss position with no credit impairment, including 93 residential mortgage-backed securities, 17 state and municipal auction-rate securities, one corporate auction-rate debt security and one U.S. Treasury security. As of June 30, 2015, approximately 93 percent of the aggregate par value of auction-rate securities have been redeemed or sold since acquisition, of which approximately 92 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 June 30, 2015.

13

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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

	Six Months Ended June 30,
(in millions)	2015			2014
Securities gains	$	—		$	1
Securities losses	(2		)	—
Net securities (losses) gains	$	(2	)	$	1

There were no securities gains or losses for both the three-month periods ended June 30, 2015 and 2014.

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)	Available-for-sale				Held-to-maturity
June 30, 2015	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Contractual maturity
Within one year	$	78	$	78	$	—	$	—
After one year through five years	710		712		—		—
After five years through ten years	883		923		—		—
After ten years	6,329		6,351		1,952		1,946
Subtotal	8,000		8,064		1,952		1,946
Equity and other non-debt securities	201		203
Total investment securities	$	8,201	$	8,267	$	1,952	$	1,946

Included in the contractual maturity distribution in the table above were residential mortgage-backed securities available-for-sale with total amortized cost and fair value of $7.2 billion and $7.3 billion, respectively, and residential mortgage-backed securities held-to-maturity with a total amortized cost and fair value of $2.0 billion and $1.9 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 June 30, 2015, investment securities with a carrying value of $2.8 billion were pledged where permitted or required by law to secure $2.2 billion of liabilities, primarily public and other deposits of state and local government agencies and derivative instruments.

14

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		Total  Loans
June 30, 2015
Business loans:
Commercial	$	45	$	3	$	7	$	55	$	186	$	32,482	$	32,723
Real estate construction:
Commercial Real Estate business line (a)	2		—		—		2		—		1,500		1,502
Other business lines (b)	—		—		8		8		1		284		293
Total real estate construction	2		—		8		10		1		1,784		1,795
Commercial mortgage:
Commercial Real Estate business line (a)	3		—		—		3		18		1,907		1,928
Other business lines (b)	14		5		2		21		59		6,666		6,746
Total commercial mortgage	17		5		2		24		77		8,573		8,674
Lease financing	—		—		—		—		11		775		786
International	4		3		—		7		9		1,404		1,420
Total business loans	68		11		17		96		284		45,018		45,398
Retail loans:
Residential mortgage	33		1		—		34		35		1,796		1,865
Consumer:
Home equity	4		2		1		7		29		1,646		1,682
Other consumer	2		—		—		2		1		793		796
Total consumer	6		2		1		9		30		2,439		2,478
Total retail loans	39		3		1		43		65		4,235		4,343
Total loans	$	107	$	14	$	18	$	139	$	349	$	49,253	$	49,741
December 31, 2014
Business loans:
Commercial	$	58	$	13	$	1	$	72	$	109	$	31,339	$	31,520
Real estate construction:
Commercial Real Estate business line (a)	3		—		—		3		1		1,602		1,606
Other business lines (b)	12		—		—		12		1		336		349
Total real estate construction	15		—		—		15		2		1,938		1,955
Commercial mortgage:
Commercial Real Estate business line (a)	8		1		1		10		22		1,758		1,790
Other business lines (b)	16		12		2		30		73		6,711		6,814
Total commercial mortgage	24		13		3		40		95		8,469		8,604
Lease financing	—		—		—		—		—		805		805
International	9		—		—		9		—		1,487		1,496
Total business loans	106		26		4		136		206		44,038		44,380
Retail loans:
Residential mortgage	9		2		—		11		36		1,784		1,831
Consumer:
Home equity	5		3		—		8		30		1,620		1,658
Other consumer	12		—		1		13		1		710		724
Total consumer	17		3		1		21		31		2,330		2,382
Total retail loans	26		5		1		32		67		4,114		4,213
Total loans	$	132	$	31	$	5	$	168	$	273	$	48,152	$	48,593

(a) Primarily loans to real estate developers.

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

15

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
June 30, 2015
Business loans:
Commercial	$	31,046	$	710	$	781	$	186	$	32,723
Real estate construction:
Commercial Real Estate business line (e)	1,490		12		—		—		1,502
Other business lines (f)	284		—		8		1		293
Total real estate construction	1,774		12		8		1		1,795
Commercial mortgage:
Commercial Real Estate business line (e)	1,818		59		33		18		1,928
Other business lines (f)	6,385		170		132		59		6,746
Total commercial mortgage	8,203		229		165		77		8,674
Lease financing	752		17		6		11		786
International	1,362		24		25		9		1,420
Total business loans	43,137		992		985		284		45,398
Retail loans:
Residential mortgage	1,815		2		13		35		1,865
Consumer:
Home equity	1,647		1		5		29		1,682
Other consumer	781		3		11		1		796
Total consumer	2,428		4		16		30		2,478
Total retail loans	4,243		6		29		65		4,343
Total loans	$	47,380	$	998	$	1,014	$	349	$	49,741
December 31, 2014
Business loans:
Commercial	$	30,310	$	560	$	541	$	109	$	31,520
Real estate construction:
Commercial Real Estate business line (e)	1,594		11		—		1		1,606
Other business lines (f)	336		7		5		1		349
Total real estate construction	1,930		18		5		2		1,955
Commercial mortgage:
Commercial Real Estate business line (e)	1,652		69		47		22		1,790
Other business lines (f)	6,434		138		169		73		6,814
Total commercial mortgage	8,086		207		216		95		8,604
Lease financing	778		26		1		—		805
International	1,468		15		13		—		1,496
Total business loans	42,572		826		776		206		44,380
Retail loans:
Residential mortgage	1,790		2		3		36		1,831
Consumer:
Home equity	1,620		—		8		30		1,658
Other consumer	718		3		2		1		724
Total consumer	2,338		3		10		31		2,382
Total retail loans	4,128		5		13		67		4,213
Total loans	$	46,700	$	831	$	789	$	273	$	48,593

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

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

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

(d) Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-55 in the Corporation's 2014 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.

(e) Primarily loans to real estate developers.

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

16

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table summarizes nonperforming assets.

(in millions)	June 30, 2015		December 31, 2014
Nonaccrual loans	$	349	$	273
Reduced-rate loans (a)	12		17
Total nonperforming loans	361		290
Foreclosed property (b)	9		10
Total nonperforming assets	$	370	$	300

(a) Reduced-rate business loans were zero at both June 30, 2015 and December 31, 2014, and reduced-rate retail loans were $12 million and $17 million at June 30, 2015 and December 31, 2014, respectively.

(b) Foreclosed residential real estate properties.

Nonaccrual loans included retail loans secured by residential real estate properties in process of foreclosure of $1 million at June 30, 2015.

Allowance for Credit Losses

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

	2015									2014
(in millions)	Business Loans			Retail Loans			Total			Business Loans			Retail Loans			Total
Three Months Ended June 30
Allowance for loan losses:
Balance at beginning of period	$	541		$	60		$	601		$	530		$	64		$	594
Loan charge-offs	(31		)	(4		)	(35		)	(24		)	(4		)	(28		)
Recoveries on loans previously charged-off	16			1			17			15			4			19
Net loan charge-offs	(15		)	(3		)	(18		)	(9		)	—			(9		)
Provision for loan losses	37			(2		)	35			7			(1		)	6
Balance at end of period	$	563		$	55		$	618		$	528		$	63		$	591
Six Months Ended June 30
Allowance for loan losses:
Balance at beginning of period	$	534		$	60		$	594		$	531		$	67		$	598
Loan charge-offs	(52		)	(6		)	(58		)	(51		)	(7		)	(58		)
Recoveries on loans previously charged-off	28			4			32			31			6			37
Net loan charge-offs	(24		)	(2		)	(26		)	(20		)	(1		)	(21		)
Provision for loan losses	54			(3		)	51			17			(3		)	14
Foreign currency translation adjustment	(1		)	—			(1		)	—			—			—
Balance at end of period	$	563		$	55		$	618		$	528		$	63		$	591
As a percentage of total loans	1.24		%	1.27		%	1.24		%	1.21		%	1.55		%	1.23		%
June 30
Allowance for loan losses:
Individually evaluated for impairment	$	39		$	—		$	39		$	39		$	—		$	39
Collectively evaluated for impairment	524			55			579			489			63			552
Total allowance for loan losses	$	563		$	55		$	618		$	528		$	63		$	591
Loans:
Individually evaluated for impairment	$	258		$	34		$	292		$	215		$	45		$	260
Collectively evaluated for impairment	45,140			4,307			49,447			43,631			3,988			47,619
Purchased credit impaired (PCI) loans	—			2			2			—			3			3
Total loans evaluated for impairment	$	45,398		$	4,343		$	49,741		$	43,846		$	4,036		$	47,882

17

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 June 30,					Six Months Ended June 30,
(in millions)	2015			2014		2015			2014
Balance at beginning of period	$	39		$	37	$	41		$	36
Charge-offs on lending related commitments (a)	(1		)	—		(1		)	—
Provision for credit losses on lending-related commitments	12			5		10			6
Balance at end of period	$	50		$	42	$	50		$	42

(a)    Charge-offs result from the sale of unfunded lending-related commitments.

18

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
June 30, 2015
Business loans:
Commercial	$	27	$	168	$	195	$	239	$	30
Real estate construction:
Other business lines (a)	—		1		1		1		—
Commercial mortgage:
Commercial Real Estate business line (b)	7		8		15		37		6
Other business lines (a)	2		36		38		55		1
Total commercial mortgage	9		44		53		92		7
International	—		9		9		16		2
Total business loans	36		222		258		348		39
Retail loans:
Residential mortgage	15		—		15		17		—
Consumer:
Home equity	12		—		12		15		—
Other consumer	7		—		7		11		—
Total consumer	19		—		19		26		—
Total retail loans (c)	34		—		34		43		—
Total individually evaluated impaired loans	$	70	$	222	$	292	$	391	$	39
December 31, 2014
Business loans:
Commercial	$	7	$	103	$	110	$	148	$	29
Real estate construction:
Other business lines (a)	—		1		1		1		—
Commercial mortgage:
Commercial Real Estate business line (b)	—		19		19		41		8
Other business lines (a)	4		43		47		63		2
Total commercial mortgage	4		62		66		104		10
Total business loans	11		166		177		253		39
Retail loans:
Residential mortgage	25		—		25		28		—
Consumer:
Home equity	12		—		12		16		—
Other consumer	5		—		5		7		—
Total consumer	17		—		17		23		—
Total retail loans (c)	42		—		42		51		—
Total individually evaluated impaired loans	$	53	$	166	$	219	$	304	$	39

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

(b) Primarily loans to real estate developers.

(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. 

19

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 performing restructured loans.

	Individually Evaluated Impaired Loans
	2015				2014
(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 June 30
Business loans:
Commercial	$	152	$	1	$	56	$	—
Real estate construction:
Commercial Real Estate business line (a)	—		—		17		—
Commercial mortgage:
Commercial Real Estate business line (a)	16		—		63		—
Other business lines (b)	40		—		71		1
Total commercial mortgage	56		—		134		1
International	5		—		2		—
Total business loans	213		1		209		1
Retail loans:
Residential mortgage	19		—		31		—
Consumer loans:
Home equity	12		—		12		—
Other consumer	5		—		4		—
Total consumer	17		—		16		—
Total retail loans	36		—		47		—
Total individually evaluated impaired loans	$	249	$	1	$	256	$	1
Six Months Ended June 30
Business loans:
Commercial	$	138	$	2	$	62	$	—
Real estate construction:
Commercial Real Estate business line (a)	—		—		18		—
Commercial mortgage:
Commercial Real Estate business line (a)	17		—		62		—
Other business lines (b)	42		—		70		2
Total commercial mortgage	59		—		132		2
International	3		—		2		—
Total business loans	200		2		214		2
Retail loans:
Residential mortgage	21		—		32		—
Consumer:
Home equity	12		—		12		—
Other consumer	5		—		4		—
Total consumer	17		—		16		—
Total retail loans	38		—		48		—
Total individually evaluated impaired loans	$	238	$	2	$	262	$	2

(a) Primarily loans to real estate developers.

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

20

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Troubled Debt Restructurings

The following tables detail the recorded balance at June 30, 2015 and 2014 of loans considered to be TDRs that were restructured during the three- and six-month periods ended June 30, 2015 and 2014, 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.

	2015						2014
	Type of Modification						Type of Modification
(in millions)	Principal Deferrals (a)		Interest Rate Reductions		Total Modifications		Principal Deferrals (a)		Interest Rate Reductions		Total Modifications
Three Months Ended June 30
Business loans:
Commercial	$	2	$	—	$	2	$	—	$	—	$	—
Commercial mortgage:
Commercial Real Estate business line (b)	1		—		1		—		—		—
Other business lines (c)	1		—		1		—		—		—
Total commercial mortgage	2		—		2		—		—		—
Total business loans	4		—		4		—		—		—
Retail loans:
Consumer:
Home equity	—		1		1		—		1		1
Total loans	$	4	$	1	$	5	$	—	$	1	$	1
Six Months Ended June 30
Business loans:
Commercial	$	2	$	—	$	2	$	1	$	—	$	1
Commercial mortgage:
Commercial Real Estate business line (b)	1		—		1		—		—		—
Other business lines (c)	4		—		4		8		—		8
Total commercial mortgage	5		—		5		8		—		8
International	—		—		—		1		—		1
Total business loans	7		—		7		10		—		10
Retail loans:
Consumer:
Home equity	—		1		1		—		2		2
Total loans	$	7	$	1	$	8	$	10	$	2	$	12

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

(b) Primarily loans to real estate developers.

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

Commitments to lend additional funds to borrowers whose terms have been modified in TDRs were insignificant at June 30, 2015 and $3 million at December 31, 2014.

The majority of the modifications considered to be TDRs that occurred during the six months ended June 30, 2015 and 2014 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 six months ended June 30, 2015 and 2014 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.

21

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table presents information regarding the recorded balance at June 30, 2015 and 2014 of loans modified by principal deferral during the twelve-month periods ended June 30, 2015 and 2014, and those principal deferrals which experienced a subsequent default during the three- and six-month periods ended June 30, 2015 and 2014. 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.

	2015							2014
(in millions)	Balance at June 30			Subsequent Default in the Three Months Ended June 30		Subsequent Default in the Six Months Ended June 30		Balance at June 30			Subsequent Default in the Three Months Ended June 30		Subsequent Default in the Six Months Ended June 30
Principal deferrals:
Business loans:
Commercial	$	10		$	—	$	6	$	12		$	—	$	2
Commercial mortgage:
Commercial Real Estate business line (a)	1			—		—		17			—		—
Other business lines (b)	10			1		2		11			—		—
Total commercial mortgage	11			1		2		28			—		—
International	—			—		—		1			—		—
Total business loans	21			1		8		41			—		2
Retail loans:
Residential mortgage	—			—		—		2		(c)	—		—
Consumer:
Home equity	2		(c)	—		—		4		(c)	—		—
Other consumer	—			—		—		1		(c)	—		—
Total consumer	2			—		—		5			—		—
Total retail loans	2			—		—		7			—		—
Total principal deferrals	$	23		$	1	$	8	$	48		$	—	$	2

(a) Primarily loans to real estate developers.

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

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

During the twelve-month periods ended June 30, 2015 and 2014, loans with a carrying value of $2 million and $5 million, respectively, were modified by interest rate reduction. 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. There were no subsequent payment defaults of reduced-rate loans during the three- and six-month periods ended June 30, 2015 and 2014.

Purchased Credit-Impaired Loans

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

No allowance for loan losses was required on the acquired PCI loan pools at both June 30, 2015 and December 31, 2014. The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at June 30, 2015 and December 31, 2014 were as follows.

(in millions)	June 30, 2015		December 31, 2014
Acquired PCI loans:
Carrying amount	$	2	$	2
Outstanding balance (principal and unpaid interest)	6		8

22

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Changes in the accretable yield for acquired PCI loans for the three- and six-month periods ended June 30, 2015 and 2014 were as follows.

	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)	2015		2014			2015			2014
Balance at beginning of period	$	1	$	11		$	1		$	15
Reclassifications from nonaccretable	—		4			1			9
Accretion	—		(9		)	(1		)	(18		)
Balance at end of period	$	1	$	6		$	1		$	6

NOTE 5 - DERIVATIVE AND CREDIT-RELATED FINANCIAL INSTRUMENTS

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

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

Credit risk is the possible loss that may occur in the event of nonperformance by the counterparty to a financial instrument. The Corporation attempts to minimize credit risk arising from customer-initiated derivatives by evaluating the creditworthiness of each customer, adhering to the same credit approval process used for traditional lending activities and obtaining collateral as deemed necessary. Derivatives with dealer counterparties are either cleared through a clearinghouse or settled directly with a single counterparty. For derivatives settled directly with dealer counterparties, the Corporation utilizes counterparty risk limits and monitoring procedures as well as master netting arrangements and bilateral collateral agreements to facilitate the management of credit risk. Master netting arrangements effectively reduce credit risk by permitting settlement of positive and negative positions and offset cash collateral held with the same counterparty on a net basis. Bilateral collateral agreements require daily exchange of cash or highly rated securities issued by the U.S. Treasury or other U.S. government entities to collateralize amounts due to either party beyond certain risk limits. At June 30, 2015, counterparties with bilateral collateral agreements had pledged $128 million of marketable investment securities and deposited $254 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had 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. At June 30, 2015, the Corporation had no derivative instruments with credit-risk-related contingent features that were in a liability position.

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

23

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

into for risk management purposes, and transactions entered into to mitigate the market risk associated with customer-initiated transactions, by conducting hedging transactions with investment grade domestic and foreign financial institutions and subjecting counterparties to credit approvals, limits and collateral monitoring procedures similar to those used in making other extensions of credit. In addition, certain derivative contracts executed bilaterally with a dealer counterparty in the over-the-counter market are cleared through a clearinghouse, whereby the clearinghouse becomes the counterparty to the transaction.

24

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 June 30, 2015 and December 31, 2014. 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.

	June 30, 2015								December 31, 2014
			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	$	2,000	$	148		$	2		$	1,800	$	175		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	657		—			2			508		4			—
Total risk management purposes	2,657		148			4			2,308		179			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	312		—			1			274		—			—
Caps and floors purchased	312		1			—			274		—			—
Swaps	11,807		135			87			11,780		153			102
Total interest rate contracts	12,431		136			88			12,328		153			102
Energy contracts:
Caps and floors written	939		1			92			1,218		—			173
Caps and floors purchased	939		92			1			1,218		173			—
Swaps	2,307		256			255			2,496		354			352
Total energy contracts	4,185		349			348			4,932		527			525
Foreign exchange contracts:
Spot, forwards, options and swaps	2,112		36			29			1,994		35			34
Total customer-initiated and other activities	18,728		521			465			19,254		715			661
Total gross derivatives	$	21,385	669			469			$	21,562	894			661
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(116		)	(116		)			(133		)	(133		)
Netting adjustment - Cash collateral received/posted			(201		)	(3		)			(262		)	—
Net derivatives included in the consolidated balance sheets (b)			352			350					499			528
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(122		)	—					(239		)	(2		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	230		$	350				$	260		$	526

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

(b) Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $4 million and $2 million at June 30, 2015 and December 31, 2014, respectively.

25

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.

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 $16 million and $18 million for the three months ended June 30, 2015 and 2014, respectively, and $34 million and $36 million for the six months ended June 30, 2015 and 2014, respectively. The Corporation recognized $2 million and an insignificant amount of net losses for the three months ended June 30, 2015 and 2014, respectively, and $1 million and an insignificant amount of net losses for the six months ended June 30, 2015 and 2014, respectively, 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.

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 losses on risk management derivative instruments used as economic hedges in "other noninterest income" in the consolidated statements of comprehensive income for each of the three- and six-month periods ended June 30, 2015 and 2014.

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 June 30, 2015 and December 31, 2014.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
June 30, 2015
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	2,000	5.0	3.99	%	0.76	%
December 31, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,800		4.6	4.54		0.49

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at June 30, 2015 and December 31, 2014.

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

Customer-Initiated and Other

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

For customer-initiated foreign exchange contracts where offsetting positions have not been taken, the Corporation manages the remaining inherent market risk through individual foreign currency position limits and aggregate value-at-risk limits. These limits are established annually and reviewed quarterly. For those customer-initiated derivative contracts which were not offset or where the Corporation holds a speculative position within the limits described above, the Corporation recognized $1 million of net gains in “other noninterest income” in the consolidated statements of comprehensive income for the three- and six-month periods ended June 30, 2015 and an insignificant amount for the three- and six-month periods ended June 30, 2014.

26

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 June 30,				Six Months Ended June 30,
(in millions)	Location of Gain	2015		2014		2015		2014
Interest rate contracts	Other noninterest income	$	5	$	4	$	7	$	8
Energy contracts	Other noninterest income	—		—		1		—
Foreign exchange contracts	Foreign exchange income	8		11		18		20
Total		$	13	$	15	$	26	$	28

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)	June 30, 2015		December 31, 2014
Unused commitments to extend credit:
Commercial and other	$	26,709	$	27,905
Bankcard, revolving check credit and home equity loan commitments	2,291		2,151
Total unused commitments to extend credit	$	29,000	$	30,056
Standby letters of credit	$	3,765	$	3,880
Commercial letters of credit	80		75
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 June 30, 2015 and December 31, 2014, the allowance for credit losses on lending-related commitments, included in “accrued expenses and other liabilities” on the consolidated balance sheets, was $50 million and $41 million, respectively.

Unused Commitments to Extend Credit

Commitments to extend credit are legally binding agreements to lend to a customer, provided there is no violation of any condition established in the contract. These commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Corporation. Commercial and other unused commitments are primarily variable rate commitments. The allowance for credit losses on lending-related commitments included $33 million and $30 million at June 30, 2015 and December 31, 2014, 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 $292 million and $316 million, respectively, of the $3.8 billion and $4.0 billion standby and commercial letters of credit outstanding at June 30, 2015 and December 31, 2014, 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 $61 million at June 30, 2015, including $44 million in deferred fees and $17 million in the allowance for credit losses on lending-related commitments. At December 31, 2014, the comparable amounts were $55 million, $44 million and $11 million, respectively.

27

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

The following table presents a summary of criticized standby and commercial letters of credit at June 30, 2015 and December 31, 2014. The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines.

(dollar amounts in millions)	June 30, 2015			December 31, 2014
Total criticized standby and commercial letters of credit	$	104		$	79
As a percentage of total outstanding standby and commercial letters of credit	2.7		%	2.0		%

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 June 30, 2015 and December 31, 2014, the total notional amount of the credit risk participation agreements was approximately $620 million and $598 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 $8 million and $7 million at June 30, 2015 and December 31, 2014, 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 June 30, 2015, the weighted average remaining maturity of outstanding credit risk participation agreements was 2.5 years.

In 2008, the Corporation sold its remaining ownership of Visa Class B shares and entered into a derivative contract. Under the terms of the derivative contract, the Corporation will compensate the counterparty primarily for dilutive adjustments made to the conversion factor of the Visa Class B shares to Class A shares based on the ultimate outcome of litigation involving Visa. Conversely, the Corporation will be compensated by the counterparty for any increase in the conversion factor from anti-dilutive adjustments. The notional amount of the derivative contract was equivalent to approximately 780,000 Visa Class B shares. The fair value of the derivative liability, included in "accrued expenses and other liabilities" on the consolidated balance sheets, was $1 million at both June 30, 2015 and December 31, 2014, respectively.

NOTE 6 - VARIABLE INTEREST ENTITIES (VIEs)

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

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

The Corporation accounts for its interests in LIHTC entities using the proportional amortization method. Exposure to loss as a result of the Corporation’s involvement with LIHTC entities at June 30, 2015 was limited to approximately $389 million. Ownership interests in other community development projects which generate similar tax credits to investors (other tax credit entities) are accounted for under either the cost or equity method. Exposure to loss as a result of the Corporation's involvement in other tax credit entities at June 30, 2015 was limited to approximately $10 million.

Investment balances, including all legally binding commitments to fund future investments, are included in “accrued income and other assets” on the consolidated balance sheets. A liability is recognized in “accrued expenses and other liabilities”

28

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

on the consolidated balance sheets for all legally binding unfunded commitments to fund tax credit entities ($130 million at June 30, 2015). Amortization and other write-downs of LIHTC investments are presented on a net basis as a component of the "provision for income taxes" on the consolidated statements of comprehensive income, while amortization and write-downs of other tax credit investments are recorded in “other noninterest income." The income tax credits and deductions are recorded as a reduction of income tax expense and a reduction of federal income taxes payable.

The Corporation provided no financial or other support that was not contractually required to any of the above VIEs during the six months ended June 30, 2015 and 2014.

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

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Other noninterest income:
Amortization of other tax credit investments	$	—		$	(1	)	$	1		$	(3	)
Provision for income taxes:
Amortization of LIHTC investments	15			14			30			28
Low income housing tax credits	(15		)	(14		)	(30		)	(28		)
Other tax benefits related to tax credit entities	(5		)	(7		)	(10		)	(13		)
Total provision for income taxes	$	(5	)	$	(7	)	(10		)	(13		)

For further information on the Corporation’s consolidation policy, see Note 1 to the consolidated financial statements in the Corporation's 2014 Annual Report.

NOTE 7 - MEDIUM- AND LONG-TERM DEBT

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

(in millions)	June 30, 2015		December 31, 2014
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	—	$	304
3.80% subordinated notes due 2026 (a)	253		257
Medium-term notes:
3.00% notes due 2015	300		300
2.125% notes due 2019 (a)	350		347
Total parent company	903		1,208
Subsidiaries
Subordinated notes:
5.75% subordinated notes due 2016 (a)	665		670
5.20% subordinated notes due 2017 (a)	541		548
7.875% subordinated notes due 2026 (a)	221		227
Total subordinated notes	1,427		1,445
Medium-term notes:
2.50% notes due 2020 (a)	495		—
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	16		22
Total subsidiaries	1,938		1,467
Total medium- and long-term debt	$	2,841	$	2,675

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

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

Comerica Bank, a wholly-owned subsidiary of the Corporation (the Bank), is a member of the FHLB, which provides short- and long-term funding to its members through advances collateralized by real estate-related assets. Actual borrowing capacity is contingent on the amount of collateral available to be pledged to the FHLB. At June 30, 2015, $14 billion of real estate-related loans were pledged to the FHLB as blanket collateral for potential future borrowings of approximately $6 billion.    

29

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

In the second quarter 2015, the Bank issued $500 million of 2.50% medium-term notes due 2020, which were swapped to a floating rate based on six-month LIBOR. Proceeds were used for general corporate purposes.

NOTE 8 - ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the six months ended June 30, 2015 and 2014, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Six Months Ended June 30,
(in millions)	2015			2014
Accumulated net unrealized gains (losses) on investment securities:
Balance at beginning of period, net of tax	$	37		$	(68	)
Net unrealized holding (losses) gains arising during the period	(17		)	116
Less: (Benefit) provision for income taxes	(6		)	41
Net unrealized holding (losses) gains arising during the period, net of tax	(11		)	75
Less:
Net realized (losses) gains included in net securities (losses) gains	(2		)	1
Less: Benefit for income taxes	(1		)	—
Reclassification adjustment for net securities (losses) gains included in net income, net of tax	(1		)	1
Less:
Net losses realized as a yield adjustment in interest on investment securities	(4		)	—
Less: Benefit for income taxes	(1		)	—
Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax	(3		)	—
Change in net unrealized (losses) gains on investment securities, net of tax	(7		)	74
Balance at end of period, net of tax	$	30		$	6
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(449	)	$	(323	)
Amortization of actuarial net loss	35			18
Amortization of prior service cost	—			1
Amounts recognized in salaries and benefits expense	35			19
Less: Provision for income taxes	12			6
Change in defined benefit pension and other postretirement plans adjustment, net of tax	23			13
Balance at end of period, net of tax	$	(426	)	$	(310	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(396	)	$	(304	)

30

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

NOTE 9 - NET INCOME PER COMMON SHARE

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

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions, except per share data)	2015		2014		2015		2014
Basic and diluted
Net income	$	135	$	151	$	269	$	290
Less:
Income allocated to participating securities	1		2		3		4
Net income attributable to common shares	$	134	$	149	$	266	$	286
Basic average common shares	176		179		176		180
Basic net income per common share	$	0.76	$	0.83	$	1.51	$	1.59
Basic average common shares	176		179		176		180
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	2		2		2		2
Net effect of the assumed exercise of warrants	4		5		4		4
Diluted average common shares	182		186		182		186
Diluted net income per common share	$	0.73	$	0.80	$	1.46	$	1.54

The following average shares related to outstanding options to purchase shares of common stock were not included in the computation of diluted net income per common share because the options were anti-dilutive for the period.

	Three Months Ended June 30,		Six Months Ended June 30,
(shares in millions)	2015	2014	2015	2014
Average outstanding options	5.0	7.2	5.9	7.9
Range of exercise prices	$49.22 - $60.82	$49.22 - $60.82	$46.68 - $60.82	$48.17 - $61.94

NOTE 10 - EMPLOYEE BENEFIT PLANS

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

Qualified Defined Benefit Pension Plan	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Service cost	$	9		$	8		$	18		$	15
Interest cost	22			22			44			44
Expected return on plan assets	(40		)	(33		)	(80		)	(66		)
Amortization of prior service cost	1			2			2			3
Amortization of net loss	15			7			29			15
Net periodic defined benefit cost	$	7		$	6		$	13		$	11

Non-Qualified Defined Benefit Pension Plan	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Service cost	$	1		$	1		$	2		$	2
Interest cost	3			3			5			5
Amortization of prior service credit	(1		)	(1		)	(2		)	(2		)
Amortization of net loss	2			1			5			3
Net periodic defined benefit cost	$	5		$	4		$	10		$	8

31

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Postretirement Benefit Plan	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Interest cost	$	—		$	1		$	1		$	2
Expected return on plan assets	(1		)	(1		)	(2		)	(2		)
Amortization of net loss	1			—			1			—
Net periodic postretirement benefit cost	$	—		$	—		$	—		$	—

For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2014 Annual Report.

NOTE 11 - INCOME TAXES AND TAX-RELATED ITEMS

At June 30, 2015, net unrecognized tax benefits were $22 million, compared to $14 million at December 31, 2014. The Corporation anticipates that it is reasonably possible that final settlement of federal and state tax issues will result in a decrease in net unrecognized tax benefits of $8 million within the next twelve months. Included in "accrued expense and other liabilities" on the consolidated balance sheets was a $3 million liability for tax-related interest and penalties at June 30, 2015 compared to $2 million at December 31, 2014.

Net deferred tax assets were $135 million at June 30, 2015, compared to $130 million at December 31, 2014. Deferred tax assets were evaluated for realization and it was determined that no valuation allowance was needed at both June 30, 2015 and December 31, 2014. This conclusion was based on sufficient taxable income in the carryback period and projected future reversals of existing taxable temporary differences to absorb the deferred tax assets.

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

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

NOTE 12 - CONTINGENT LIABILITIES

Legal Proceedings

As previously reported in the Corporation's Form 10-K for the year ended December 31, 2014 and Form 10-Q for the period ended March 31, 2015, Comerica Bank, a wholly owned subsidiary of the Corporation, was named in November 2011 as a third-party defendant in Butte Local Development v. Masters Group v. Comerica Bank (“the case”), for lender liability. The case was tried in January 2014, in the Montana Second District Judicial Court for Silver Bow County in Butte, Montana. On January 17, 2014, a jury awarded Masters $52 million against the Bank. On July 1, 2015, after an appeal filed by the Corporation, the Montana Supreme Court ("the court") reversed the judgment against the Corporation and remanded the case for a new trial with instructions that Michigan law should apply. The court also reversed punitive and consequential damages previously awarded by the jury. Masters subsequently petitioned the court for rehearing, asking the court to affirm the economic damages portion of the jury verdict (approximately $25 million). The Corporation believes it has meritorious defenses to the remaining claims in this case and intends to continue to defend itself vigorously.

The Corporation and certain of its subsidiaries are subject to various other pending or threatened legal proceedings arising out of the normal course of business or operations. The Corporation believes it has meritorious defenses to the claims asserted against it in its other currently outstanding legal proceedings and, with respect to such legal proceedings, intends to continue to defend itself vigorously, litigating or settling cases according to management’s judgment as to what is in the best interests of the Corporation and its shareholders. Settlement may result from the Corporation's determination that it may be more prudent financially to settle, rather than litigate, and should not be regarded as an admission of liability. On at least a quarterly basis, the Corporation assesses its potential liabilities and contingencies in connection with outstanding legal proceedings utilizing the latest information available. On a case-by-case basis, reserves are established for those legal claims for which it is probable that a loss will be incurred either as a result of a settlement or judgment, and the amount of such loss can be reasonably estimated. The actual costs of resolving these claims may be substantially higher or lower than the amounts reserved. Based on current knowledge, and after consultation with legal counsel, management believes that current reserves are adequate, and the amount of any incremental liability arising from these matters is not expected to have a material adverse effect on the Corporation’s consolidated financial condition,

32

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

consolidated results of operations or consolidated cash flows. Legal fees of $5 million were included in "other noninterest expenses" on the consolidated statements of income for both the three-month periods ended June 30, 2015 and 2014 and $10 million for both the six-month periods ended June 30, 2015 and 2014.

For matters where a loss is not probable, the Corporation has not established legal reserves. The Corporation believes the estimate of the aggregate range of reasonably possible losses, in excess of reserves established, for all legal proceedings in which it is involved is from zero to approximately $43 million at June 30, 2015. This estimated aggregate range of reasonably possible losses is based upon currently available information for those proceedings in which the Corporation is involved, taking into account the Corporation’s best estimate of such losses for those cases for which such estimate can be made. For certain cases, the Corporation does not believe that an estimate can currently be made. The Corporation’s estimate involves significant judgment, given the varying stages of the proceedings (including the fact that many are currently in preliminary stages), the existence in certain proceedings of multiple defendants (including the Corporation) whose share of liability has yet to be determined, the numerous yet-unresolved issues in many of the proceedings (including issues regarding class certification and the scope of many of the claims) and the attendant uncertainty of the various potential outcomes of such proceedings. Accordingly, the Corporation’s estimate will change from time to time, and actual losses may be more or less than the current estimate.

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

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

NOTE 13 - BUSINESS SEGMENT INFORMATION

The Corporation has strategically aligned its operations into three major business segments: the Business Bank, the Retail Bank and Wealth Management. These business segments are differentiated based on the type of customer and the related products and services provided. In addition to the three major business segments, the Finance Division is also reported as a segment. Business segment results are produced by the Corporation’s internal management accounting system. This system measures financial results based on the internal business unit structure of the Corporation. The performance of the business segments is not comparable with the Corporation's consolidated results and is not necessarily comparable with similar information for any other financial institution. Additionally, because of the interrelationships of the various segments, the information presented is not indicative of how the segments would perform if they operated as independent entities. The management accounting system assigns balance sheet and income statement items to each business segment using certain methodologies, which are regularly reviewed and refined. These methodologies may be modified as the management accounting system is enhanced and changes occur in the organizational structure and/or product lines. For comparability purposes, amounts in all periods are based on business segments and methodologies in effect at June 30, 2015.

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

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

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

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

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

33

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

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 2014 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 June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	155		$	45		$	(155	)	$	2		$	422
Provision for credit losses	61			(8		)	(9		)	—			3			47
Noninterest income	140			46			60			14			1			261
Noninterest expenses	176			182			74			3			1			436
Provision (benefit) for income taxes (FTE)	96			9			14			(54		)	—			65
Net income (loss)	$	182		$	18		$	26		$	(90	)	$	(1	)	$	135
Net loan charge-offs (recoveries)	$	22		$	1		$	(5	)	$	—		$	—		$	18
Selected average balances:
Assets	$	39,135		$	6,459		$	5,153		$	11,721		$	6,495		$	68,963
Loans	38,109			5,770			4,954			—			—			48,833
Deposits	30,229			22,747			4,060			93			269			57,398
Statistical data:
Return on average assets (a)	1.87		%	0.30		%	2.01		%	N/M			N/M			0.79		%
Efficiency ratio (b)	34.19		%	89.88		%	70.27		%	N/M			N/M			63.68		%

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Three Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	152		$	44		$	(160	)	$	6		$	417
Provision for credit losses	35			(6		)	(10		)	—			(8		)	11
Noninterest income	100			41			62			15			2			220
Noninterest expenses	143			174			76			2			9			404
Provision (benefit) for income taxes (FTE)	100			9			15			(56		)	3			71
Net income (loss)	$	197		$	16		$	25		$	(91	)	$	4		$	151
Net loan charge-offs (recoveries)	$	9		$	3		$	(3	)	$	—		$	—		$	9
Selected average balances:
Assets	$	37,305		$	6,222		$	4,987		$	11,055		$	5,309		$	64,878
Loans	36,367			5,554			4,804			—			—			46,725
Deposits	27,351			21,890			3,616			258			269			53,384
Statistical data:
Return on average assets (a)	2.11		%	0.29		%	2.02		%	N/M			N/M			0.93		%
Efficiency ratio b)	30.07		%	90.06		%	72.11		%	N/M			N/M			63.35		%

(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

34

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Six Months Ended June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	744		$	307		$	88		$	(308	)	$	5		$	836
Provision for credit losses	86			(16		)	(10		)	—			1			61
Noninterest income	282			88			118			27			1			516
Noninterest expenses	376			357			151			5			6			895
Provision (benefit) for income taxes (FTE)	193			19			23			(107		)	(1		)	127
Net income (loss)	$	371		$	35		$	42		$	(179	)	$	—		$	269
Net loan charge-offs (recoveries)	$	31		$	2		$	(7	)	$	—		$	—		$	26
Selected average balances:
Assets	$	38,896		$	6,414		$	5,091		$	11,930		$	6,521		$	68,852
Loans	37,868			5,732			4,894			—			—			48,494
Deposits	30,187			22,577			4,028			131			273			57,196
Statistical data:
Return on average assets (a)	1.91		%	0.30		%	1.65		%	N/M			N/M			0.78		%
Efficiency ratio (b)	36.69			90.22			72.40			N/M			N/M			66.07

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Six Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	744		$	301		$	89		$	(318	)	$	12		$	828
Provision for credit losses	52			(5		)	(18		)	—			(9		)	20
Noninterest income	191			82			122			29			4			428
Noninterest expenses	289			348			152			5			16			810
Provision (benefit) for income taxes (FTE)	199			14			28			(111		)	6			136
Net income (loss)	$	395		$	26		$	49		$	(183	)	$	3		$	290
Net loan charge-offs (recoveries)	$	20		$	6		$	(5	)	$	—		$	—		$	21
Selected average balances:
Assets	$	36,522		$	6,224		$	4,959		$	11,092		$	5,997		$	64,794
Loans	35,567			5,555			4,783			—			—			45,905
Deposits	27,173			21,759			3,599			305			243			53,079
Statistical data:
Return on average assets (a)	2.16		%	0.24		%	1.99		%	N/M			N/M			0.90		%
Efficiency ratio (b)	30.85			90.69			72.61			N/M			N/M			64.55

(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 June 30, 2015.

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

35

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

Market segment financial results are as follows:

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	179		$	181		$	130		$	85		$	(153	)	$	422
Provision for credit losses	(13		)	4			43			10			3			47
Noninterest income	85			37			31			93			15			261
Noninterest expenses	128			100			94			110			4			436
Provision (benefit) for income taxes (FTE)	51			43			10			15			(54		)	65
Net income (loss)	$	98		$	71		$	14		$	43		$	(91	)	$	135
Net loan charge-offs (recoveries)	$	(2	)	$	6		$	5		$	9		$	—		$	18
Selected average balances:
Assets	$	13,852		$	16,696		$	11,878		$	8,321		$	18,216		$	68,963
Loans	13,290			16,429			11,254			7,860			—			48,833
Deposits	21,706			17,275			10,959			7,096			362			57,398
Statistical data:
Return on average assets (a)	1.73		%	1.54		%	0.46		%	2.05		%	N/M			0.79		%
Efficiency ratio (b)	48.21		%	46.04		%	58.20		%	61.45		%	N/M			63.68		%

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	182		$	176		$	137		$	76		$	(154	)	$	417
Provision for credit losses	(9		)	14			22			(8		)	(8		)	11
Noninterest income	89			38			35			41			17			220
Noninterest expenses	159			100			89			45			11			404
Provision (benefit) for income taxes (FTE)	44			37			22			21			(53		)	71
Net income (loss)	$	77		$	63		$	39		$	59		$	(87	)	$	151
Net loan charge-offs (recoveries)	$	10		$	5		$	2		$	(8	)	$	—		$	9
Selected average balances:
Assets	$	13,851		$	15,721		$	11,661		$	7,281		$	16,364		$	64,878
Loans	13,482			15,439			10,966			6,838			—			46,725
Deposits	20,694			15,370			10,724			6,069			527			53,384
Statistical data:
Return on average assets (a)	1.42		%	1.54		%	1.30		%	3.28		%	N/M			0.93		%
Efficiency ratio (b)	58.67		%	46.64		%	51.67		%	38.73		%	N/M			63.35		%

(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

Notes to Consolidated Financial Statements (unaudited)

Comerica Incorporated and Subsidiaries

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Six Months Ended June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	357		$	357		$	260		$	165		$	(303	)	$	836
Provision for credit losses	(21		)	1			64			16			1			61
Noninterest income	166			74			67			181			28			516
Noninterest expenses	283			199			189			213			11			895
Provision (benefit) for income taxes (FTE)	89			87			28			31			(108		)	127
Net income (loss)	$	172		$	144		$	46		$	86		$	(179	)	$	269
Net loan charge-offs	$	1		$	6		$	8		$	11		$	—		$	26
Selected average balances:
Assets	$	13,794		$	16,580		$	12,034		$	7,993		$	18,451		$	68,852
Loans	13,257			16,312			11,394			7,531			—			48,494
Deposits	21,709			17,057			10,985			7,041			404			57,196
Statistical data:
Return on average assets (a)	1.52		%	1.59		%	0.74		%	2.15		%	N/M			0.78		%
Efficiency ratio (b)	54.14			46.20			57.81			61.01			N/M			66.07

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Six Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	364		$	349		$	273		$	148		$	(306	)	$	828
Provision for credit losses	(5		)	25			29			(20		)	(9		)	20
Noninterest income	173			73			69			80			33			428
Noninterest expenses	320			197			179			93			21			810
Provision (benefit) for income taxes (FTE)	80			74			48			39			(105		)	136
Net income (loss)	$	142		$	126		$	86		$	116		$	(180	)	$	290
Net loan charge-offs (recoveries)	$	10		$	15		$	8		$	(12	)	$	—		$	21
Selected average balances:
Assets	$	13,835		$	15,429		$	11,367		$	7,074		$	17,089		$	64,794
Loans	13,478			15,133			10,667			6,627			—			45,905
Deposits	20,668			15,078			10,799			5,986			548			53,079
Statistical data:
Return on average assets (a)	1.32		%	1.57		%	1.43		%	3.28		%	N/M			0.90		%
Efficiency ratio (b)	59.56			46.62			52.30			40.99			N/M			64.55

(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

NOTE 14 - SUBSEQUENT EVENTS

On July 22, 2015, the Bank issued $350 million of 4.00% subordinated notes due July 27, 2025 and $175 million of 2.50% senior notes due June 2, 2020. None of the notes are redeemable prior to maturity. Proceeds from both issuances will be used for general corporate purposes.

37

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

FORWARD-LOOKING STATEMENTS

This report includes forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. In addition, the Corporation may make other written and oral communications from time to time that contain such statements. All statements regarding the Corporation's expected financial position, strategies and growth prospects and general economic conditions expected to exist in the future are forward-looking statements. The words, "anticipates," "believes," "contemplates," "feels," "expects," "estimates," "seeks," "strives," "plans," "intends," "outlook," "forecast," "position," "target," "mission," "assume," "achievable," "potential," "strategy," "goal," "aspiration," "opportunity," "initiative," "outcome," "continue," "remain," "maintain," "on course," "trend," "objective," "looks forward," "projects," "models," and variations of such words and similar expressions, or future or conditional verbs such as "will," "would," "should," "could," "might," "can," "may" or similar expressions, as they relate to the Corporation or its management, are intended to identify forward-looking statements. These forward-looking statements are predicated on the beliefs and assumptions of the Corporation's management based on information known to the Corporation's management as of the date of this report and do not purport to speak as of any other date. Forward-looking statements may include descriptions of plans and objectives of the Corporation's management for future or past operations, products or services, and forecasts of the Corporation's revenue, earnings or other measures of economic performance, including statements of profitability, business segments and subsidiaries, estimates of credit trends and global stability. Such statements reflect the view of the Corporation's management as of this date with respect to future events and are subject to risks and uncertainties. Should one or more of these risks materialize or should underlying beliefs or assumptions prove incorrect, the Corporation's actual results could differ materially from those discussed. Factors that could cause or contribute to such differences are changes in general economic, political or industry conditions; changes in monetary and fiscal policies, including changes in interest rates; changes in regulation or oversight; Comerica's ability to maintain adequate sources of funding and liquidity; the effects of more stringent capital or liquidity requirements; declines or other changes in the businesses or industries of Comerica's customers, including the energy industry; operational difficulties, failure of technology infrastructure or information security incidents; reliance on other companies to provide certain key components of business infrastructure; factors impacting noninterest expenses which are beyond Comerica's control; changes in the financial markets, including fluctuations in interest rates and their impact on deposit pricing; changes in Comerica's credit rating; unfavorable developments concerning credit quality; the interdependence of financial service companies; the implementation of Comerica's strategies and business initiatives; Comerica's ability to utilize technology to efficiently and effectively develop, market and deliver new products and services; competitive product and pricing pressures among financial institutions within Comerica's markets; changes in customer behavior; any future strategic acquisitions or divestitures; management's ability to maintain and expand customer relationships; management's ability to retain key officers and employees; the impact of legal and regulatory proceedings or determinations; the effectiveness of methods of reducing risk exposures; the effects of terrorist activities and other hostilities; the effects of catastrophic events including, but not limited to, hurricanes, tornadoes, earthquakes, fires, droughts and floods; changes in accounting standards and the critical nature of Comerica's accounting policies. The Corporation cautions that the foregoing list of factors is not exclusive. For discussion of factors that may cause actual results to differ from expectations, please refer to our filings with the Securities and Exchange Commission. In particular, please refer to “Item 1A. Risk Factors” beginning on page 12 of Comerica's Annual Report on Form 10-K for the year ended December 31, 2014. Forward-looking statements speak only as of the date they are made. The Corporation does not undertake to update forward-looking statements to reflect facts, circumstances, assumptions or events that occur after the date the forward-looking statements are made. For any forward-looking statements made in this report or in any documents, the Corporation claims the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995.

38

RESULTS OF OPERATIONS

Net income for the three months ended June 30, 2015 was $135 million, a decrease of $16 million from $151 million reported for the three months ended June 30, 2014. The decrease in net income primarily reflected a $36 million increase in the provision for credit losses and increases in revenue-generating noninterest expenses and technology-related contract labor expense, partially offset by a $33 million decrease in litigation-related expense as well as increases in net interest income and several fee-based noninterest income categories. Net income per diluted common share was $0.73 and $0.80 for the three months ended June 30, 2015 and 2014, respectively. Average diluted common shares were 182 million and 186 million for the three months ended June 30, 2015 and 2014, respectively.

Net income for the six months ended June 30, 2015 was $269 million, a decrease of $21 million from $290 million reported for the six months ended June 30, 2014. The decrease in net income was largely due to the same reasons as described in the quarterly discussion above. Net income per diluted common share was $1.46 and $1.54 for the six months ended June 30, 2015 and 2014, respectively. Average diluted common shares were 182 million and 186 million for the six months ended June 30, 2015 and 2014, respectively.

Full-Year 2015 Outlook Compared to Full-Year 2014

Management expectations for full-year 2015 compared to full-year 2014, assuming a continuation of the current economic and low-rate environment, are as follows:

• Average full-year loan growth consistent with 2014, reflecting seasonal declines in Mortgage Banker Finance and National Dealer Services in the second half of the year, a continued decline in Energy, and a sustained focus on pricing and structure discipline.

• Net interest income relatively stable, assuming no rise in interest rates, reflecting a decrease of about $30 million in purchase accounting accretion, to about $6 million, and the impact of a continuing low rate environment on asset yields, offset by earning asset growth.

• Provision for credit losses higher, with third and fourth quarter net charge-offs each at levels similar to the second quarter. If energy prices remain low, continued negative migration is possible, which may be offset by lower exposure balances.

• Noninterest income relatively stable, excluding the impact of a change in accounting presentation for a card program. Stable noninterest income reflects growth in fee income, particularly card fees and fiduciary income, mostly offset by a decline in warrant income and regulatory impacts on letter of credit and derivative income.

• Noninterest expenses higher, excluding the impact of a change in accounting presentation for a card program, with continued focus on driving efficiencies for the long term. Expenses for the second half of 2015 are expected to be higher than the first half, reflecting three more days in the second half, the impact of merit increases, a ramp-up in the second half of technology and regulatory expenses, as well as higher pension, outside processing and occupancy expenses. Technology and regulatory expenses are expected to increase approximately $40 million in total compared to 2014.

• Income tax expense to approximate 32 percent of pre-tax income.

For information about the change in accounting presentation for a card program, refer to Note 1 to the unaudited consolidated financial statements and under the "Noninterest Income" subheading later in this section of the financial review.

39

Net Interest Income

The "Quarterly Analysis of Net Interest Income & Rate/Volume - Fully Taxable Equivalent" table that follows provides an analysis of net interest income (FTE) for the three months ended June 30, 2015 and 2014 and details the components of the change in net interest income on a FTE basis for the three months ended June 30, 2015 compared to the same period in the prior year.

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

	Three Months Ended
	June 30, 2015							June 30, 2014
(dollar amounts in millions)	Average Balance			Interest		Average Rate		Average Balance			Interest		Average Rate
Commercial loans	$	31,788		$	244	3.07	%	$	29,890		$	231	3.10	%
Real estate construction loans	1,807			16		3.51		1,913			16		3.44
Commercial mortgage loans	8,672			73		3.38		8,749			85		3.88
Lease financing	795			6		3.19		850			7		3.26
International loans	1,453			13		3.68		1,328			12		3.64
Residential mortgage loans	1,877			18		3.78		1,773			17		3.82
Consumer loans	2,441			20		3.25		2,222			18		3.22
Total loans (a)	48,833			390		3.20		46,725			386		3.31
Mortgage-backed securities (b)	9,057			49		2.23		8,996			53		2.35
Other investment securities	879			3		1.16		368			—		0.46
Total investment securities (b)	9,936			52		2.13		9,364			53		2.28
Interest-bearing deposits with banks	5,110			3		0.25		3,949			3		0.25
Other short-term investments	102			—		0.42		110			—		0.61
Total earning assets	63,981			445		2.79		60,148			442		2.95
Cash and due from banks	1,041							921
Allowance for loan losses	(613		)					(602		)
Accrued income and other assets	4,554							4,411
Total assets	$	68,963						$	64,878
Money market and interest-bearing checking deposits	$	23,659		6		0.11		$	22,296		6		0.10
Savings deposits	1,834			—		0.02		1,742			—		0.03
Customer certificates of deposit	4,422			4		0.37		5,041			5		0.36
Foreign office time deposits	118			1		1.26		294			—		0.68
Total interest-bearing deposits	30,033			11		0.14		29,373			11		0.15
Short-term borrowings	78			—		0.04		210			—		0.03
Medium- and long-term debt	2,661			12		1.83		2,998			14		1.77
Total interest-bearing sources	32,772			23		0.28		32,581			25		0.30
Noninterest-bearing deposits	27,365							24,011
Accrued expenses and other liabilities	1,314							955
Total shareholders’ equity	7,512							7,331
Total liabilities and shareholders’ equity	$	68,963						$	64,878
Net interest income/rate spread (FTE)				$	422	2.51					$	417	2.65
FTE adjustment				$	1						$	1
Impact of net noninterest-bearing sources of funds						0.14							0.13
Net interest margin (as a percentage of average earning assets) (FTE) (a)						2.65	%						2.78	%

(a) Accretion of the purchase discount on the acquired loan portfolio of $2 million and $10 million in the three-month periods ended June 30, 2015 and 2014, respectively, increased the net interest margin by 1 basis point and 7 basis points in each respective period.

(b) Includes investment securities available-for-sale and investment securities held-to-maturity.

40

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

	Three Months Ended
	June 30, 2015/June 30, 2014
(in millions)	Increase (Decrease) Due to Rate			Increase (Decrease) Due to  Volume (a)			Net Increase (Decrease)
Interest Income (FTE):
Loans	$	(14	)	$	18		$	4
Investment securities (b)	(2		)	1			(1		)
Total interest income (FTE)	(16		)	19			3
Interest Expense:
Medium- and long-term debt	—			(2		)	(2		)
Total interest expense	—			(2		)	(2		)
Net interest income (FTE)	$	(16	)	$	21		$	5

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

(b) Includes investment securities available-for-sale and investment securities held-to-maturity.

Net interest income was $421 million for the three months ended June 30, 2015, an increase of $5 million compared to $416 million for the three months ended June 30, 2014. The increase in net interest income resulted primarily from the benefit provided by an increase in average earning assets and a decrease in average medium- and long-term debt, partially offset by the impact of lower yields on loans and investment securities. Average earning assets increased $3.8 billion, or 6 percent, compared to $60.1 billion for the same period in 2014. The increase in average earning assets primarily reflected increases of $2.1 billion in average loans, $1.2 billion in average interest-bearing deposits with banks and $572 million in average investment securities. The net interest margin (FTE) for the three months ended June 30, 2015 decreased 13 basis points to 2.65 percent, from 2.78 percent for the comparable period in 2014, primarily from an increase in balances deposited with the Federal Reserve Bank (FRB) as well as lower yields on loans and investment securities. The decrease in loan yields primarily reflected a decrease in accretion on the acquired loan portfolio, shifts in the average loan portfolio mix and the impact of a competitive low-rate environment, partially offset by a benefit from the increase in 30-day LIBOR. Accretion of the purchase discount on the acquired loan portfolio increased the net interest margin by 1 basis point for the three months ended June 30, 2015, compared to 7 basis points for the same period in 2014. Average balances deposited with the FRB were $5.0 billion and $3.8 billion in the three months ended June 30, 2015 and 2014, respectively, and are included in "interest bearing deposits with banks" on the consolidated balance sheets.

41

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

	Six Months Ended
	June 30, 2015							June 30, 2014
(dollar amounts in millions)	Average Balance			Interest		Average Rate		Average Balance			Interest		Average Rate
Commercial loans	$	31,442		$	478	3.06	%	$	29,130		$	453	3.13	%
Real estate construction loans	1,872			32		3.43		1,871			32		3.42
Commercial mortgage loans	8,627			146		3.41		8,759			170		3.92
Lease financing	796			12		3.12		849			16		3.66
International loans	1,482			27		3.69		1,315			24		3.66
Residential mortgage loans	1,866			35		3.77		1,749			33		3.84
Consumer loans	2,409			39		3.23		2,232			35		3.19
Total loans (a)	48,494			769		3.19		45,905			763		3.35
Mortgage-backed securities (b)	9,064			100		2.24		8,954			107		2.39
Other investment securities	858			5		1.13		369			1		0.44
Total investment securities (b)	9,922			105		2.15		9,323			108		2.31
Interest-bearing deposits with banks	5,216			7		0.25		4,695			7		0.26
Other short-term investments	100			—		0.75		110			—		0.63
Total earning assets	63,732			881		2.79		60,033			878		2.94
Cash and due from banks	1,034							917
Allowance for loan losses	(607		)					(602		)
Accrued income and other assets	4,693							4,446
Total assets	$	68,852						$	64,794
Money market and interest-bearing checking deposits	$	23,809		13		0.11		$	22,279		12		0.11
Savings deposits	1,810			—		0.02		1,721			—		0.03
Customer certificates of deposit	4,423			8		0.37		5,075			9		0.36
Foreign office and other time deposits	121			1		1.36		378			1		0.52
Total interest-bearing deposits	30,163			22		0.14		29,453			22		0.15
Short-term borrowings	94			—		0.05		198			—		0.03
Medium- and long-term debt	2,675			23		1.78		3,270			28		1.64
Total interest-bearing sources	32,932			45		0.28		32,921			50		0.30
Noninterest-bearing deposits	27,033							23,626
Accrued expenses and other liabilities	1,405							967
Total shareholders’ equity	7,482							7,280
Total liabilities and shareholders’ equity	$	68,852						$	64,794
Net interest income/rate spread (FTE)				$	836	2.51					$	828	2.64
FTE adjustment				$	2						$	2
Impact of net noninterest-bearing sources of funds						0.14							0.14
Net interest margin (as a percentage of average earning assets (FTE) (a)						2.65	%						2.78	%

(a) Accretion of the purchase discount on the acquired loan portfolio of $4 million and $22 million in the six-month periods ended June 30, 2015 and 2014, respectively, increased the net interest margin by 1 basis point and 7 basis points in each respective period.

(b) Includes investment securities available-for-sale and investment securities held-to-maturity.

42

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

	Six Months Ended
	June 30, 2015/June 30, 2014
(in millions)	Increase (Decrease) Due to Rate			Increase (Decrease) Due to Volume (a)			Net Increase (Decrease)
Interest Income (FTE):
Loans	$	(34	)	$	40		$	6
Investment securities (b)	(6		)	3			(3		)
Total interest income (FTE)	(40		)	43			3
Interest Expense:
Interest-bearing deposits	2			(2		)	—
Medium- and long-term debt	1			(6		)	(5		)
Total interest expense	3			(8		)	(5		)
Net interest income (FTE)	$	(43	)	$	51		$	8

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

(b) Includes investment securities available-for-sale and investment securities held-to-maturity.

Net interest income was $834 million for the six months ended June 30, 2015, an increase of $8 million compared to $826 million for the six months ended June 30, 2014. The increase in net interest income resulted primarily from the benefit provided by an increase in average earning assets and a decrease in average medium- and long-term debt, partially offset by the impact of lower yields on loans and investment securities. Average earning assets increased $3.7 billion, or 6 percent, to $63.7 billion for the six months ended June 30, 2015, compared to $60.0 billion for the same period in 2014. The increase in average earning assets primarily reflected increases of $2.6 billion in average loans, $599 million in average investment securities and $521 million in average interest-bearing deposits with banks. The net interest margin (FTE) for the six months ended June 30, 2015 decreased 13 basis points to 2.65 percent, from 2.78 percent for the comparable period in 2014, largely for the same reasons as discussed previously in the quarterly analysis. The decrease in loan yields reflected a decrease in accretion on the acquired loan portfolio, shifts in the average loan portfolio mix and the impact of a competitive low-rate environment, partially offset by a benefit from the increase in 30-day LIBOR. Accretion of the purchase discount on the acquired loan portfolio increased the net interest margin by 1 basis point for the six months ended June 30, 2015, compared to 7 basis points for the same period in 2014. Average balances deposited with the Federal Reserve Bank (FRB) were 5.1 billion and $4.6 billion in the six months ended June 30, 2015 and 2014, respectively, and are included in "interest bearing deposits with banks" on the consolidated balance sheets.

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

Provision for Credit Losses

The provision for credit losses was $47 million and $11 million for the three-month periods ended June 30, 2015 and 2014, respectively, and $61 million and $20 million for the six-month periods ended June 30, 2015 and 2014, respectively. The provision for credit losses includes both the provision for loan losses and the provision for credit losses on lending-related commitments.

The provision for loan losses is recorded to maintain the allowance for loan losses at the level deemed appropriate by the Corporation to cover probable credit losses inherent in the portfolio. The provision for loan losses was $35 million for the three months ended June 30, 2015, compared to $6 million for the three months ended June 30, 2014. The increase in the provision primarily reflected the impact of loan growth and increased reserves for energy and energy-related loans, as a result of an increase in criticized loans and the impact of continued volatility and sustained lower energy prices. In addition, Corporate Banking and, to a lesser extent, Technology and Life Sciences contributed to the increase in the provision, largely as a result of charge-offs and variability. These increases were partially offset by improvements in credit quality in the remainder of the portfolio. The provision for loan losses was $51 million for the six months ended June 30, 2015, an increase of $37 million compared to $14 million for the same period in the prior year, largely for the same reasons as the quarterly increase discussed above, with the exception of Technology and Life Sciences, which did not contribute to the year-to-date provision increase.

Net loan charge-offs in the three months ended June 30, 2015 increased $9 million to $18 million, or 0.15 percent of average total loans, compared to $9 million, or 0.08 percent, for the three months ended June 30, 2014. The increase in net loan charge-offs in the three months ended June 30, 2015, compared to the same period in 2014, primarily reflected increases in Corporate Banking and Technology and Life Sciences, partially offset by a decrease in Commercial Real Estate.

Net loan charge-offs in the six months ended June 30, 2015 increased $5 million to $26 million, or 0.11 percent of average total loans, compared to $21 million, or 0.09 percent, for the six months ended June 30, 2014. The increase in net loan charge-offs

43

in the six months ended June 30, 2015, compared to the same period in 2014, primarily reflected increases in general Middle Market and Corporate Banking, partially offset by decreases in most other business lines, with the largest decreases in Commercial Real Estate as well as Technology and Life Sciences.

The provision for credit losses on lending-related commitments is recorded to maintain the allowance for credit losses on lending-related commitments at the level deemed appropriate by the Corporation to cover probable credit losses inherent in lending-related commitments. The provision for credit losses on lending-related commitments was $12 million in the three months ended June 30, 2015, compared to $5 million in the three months ended June 30, 2014, and $10 million for the six months ended June 30, 2015 compared to $6 million for the same period in 2014. The $7 million increase in the provision for credit losses on lending-related commitments in the three months ended June 30, 2015 compared to the same period in 2014, as well as the $4 million increase in the provision for credit losses on lending-related commitments in the six months ended June 30, 2015 compared to the same period in 2014, primarily reflected additional reserves for energy and energy-related commitments. Lending-related commitment charge-offs were $1 million for the three- and six-month periods ended June 30, 2015 and insignificant for the same periods in 2014.

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

Noninterest Income

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2015		2014		2015			2014
Service charges on deposit accounts	$	56	$	54	$	111		$	108
Fiduciary income	48		45		95			89
Commercial lending fees	22		23		47			43
Card fees (a)	72		22		139			45
Letter of credit fees	13		15		26			29
Bank-owned life insurance	10		11		19			20
Foreign exchange income	9		12		19			21
Brokerage fees	5		4		9			9
Net securities (losses) gains	—		—		(2		)	1
Other noninterest income (b)	26		34		53			63
Total noninterest income	$	261	$	220	$	516		$	428

(a) Effective January 1, 2015, contractual changes to a card program resulted in a change to the accounting presentation of the related revenues and expenses. The effect of this change was increases of $44 million and $88 million to card fees in the three- and six-month periods ended June 30, 2015, respectively.

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

Noninterest income was $261 million for the three months ended June 30, 2015, an increase of $41 million compared to $220 million for the same period in 2014. Excluding the $44 million impact of the change in accounting presentation on card fees as described in footnote (a) to the above table, noninterest income decreased $3 million, primarily reflecting increases in card fees, fiduciary income and service charges on deposit accounts, which were more than offset by declines in foreign exchange income and several non-fee categories. Card fees increased $6 million, primarily driven by a change to the Corporation's strategy for providing merchant payment processing services. The Corporation concluded its participation in a joint venture that provided merchant payment processing services in the second quarter 2015. Income from the joint venture was recorded in other noninterest income using the equity method. The Corporation now directly enters into agreements with its merchants and uses a third party to process the transactions. Pursuant to the agreements with the merchants and the arrangement with the third-party vendor, merchant payment processing income is recognized in card fees, and related processing expense is recognized in outside processing fees in noninterest expenses. For further discussion about the impact of using a third party to process merchant transactions on outside processing fees, refer to the "Noninterest Expenses" subheading below. Fiduciary income increased $3 million and service charges on deposit accounts increased $2 million. These increases were more than offset by decreases of $3 million each in foreign exchange income and income from principal investing and warrants, along with small decreases in several other non-fee categories.

Noninterest income was $516 million for the six months ended June 30, 2015, an increase of $88 million compared to $428 million for the same period in 2014. Excluding the $88 million impact of the above-described accounting presentation change, noninterest income was unchanged. Within noninterest income, fiduciary income and card fees each increased $6 million, commercial lending fees increased $4 million and service charges on deposit accounts increased $3 million. Offsetting the increases in noninterest income were decreases of $5 million in income from principal investing and warrants, $3 million each in net securities gains and letter of credit fee income, and $2 million in foreign exchange income, as well as small decreases in several other non-fee categories.

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

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2015		2014		2015		2014
Investment banking fees	$	5	$	6	$	9	$	10
Customer derivative income	5		4		8		8
Insurance commissions	2		3		5		7
Securities trading income	3		3		5		4
Deferred compensation asset returns (a)	1		1		2		3
Income from principal investing and warrants	1		4		1		6
Income from unconsolidated subsidiaries	—		2		3		3
All other noninterest income	9		11		20		22
Other noninterest income	$	26	$	34	$	53	$	63

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

Noninterest Expenses

	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)	2015			2014		2015			2014
Salaries and benefits expense	$	251		$	240	$	504		$	487
Net occupancy expense	39			39		77			79
Equipment expense	13			15		26			29
Outside processing fee expense (a)	85			30		162			58
Software expense	24			25		47			47
Litigation-related expense	(30		)	3		(29		)	6
FDIC insurance expense	9			8		18			16
Advertising expense	6			5		12			11
Other noninterest expenses	39			39		78			77
Total noninterest expenses	$	436		$	404	$	895		$	810

(a) Effective January 1, 2015, contractual changes to a card program resulted in a change to the accounting presentation of the related revenues and expenses. The effect of this change was increases of $44 million and $88 million to outside processing fee expense in the three- and six-month periods ended June 30, 2015, respectively.

Noninterest expenses were $436 million for the three months ended June 30, 2015, an increase of $32 million compared to $404 million for the three months ended June 30, 2014. Excluding the $44 million impact of the change in accounting presentation on outside processing fees as described in footnote (a) to the above table, noninterest expenses decreased $12 million in the three months ended June 30, 2015, compared to the same period in the prior year, largely reflecting a $33 million reduction in litigation-related expenses, partially offset by higher outside processing expenses related to revenue generating activities and an increase in salaries and benefits expense. See to Note 12 to the consolidated financial statements for information related to litigation expense. Salaries and benefits expense increased $11 million, primarily reflecting an increase in technology-related contract labor expense and the impact of merit increases. Excluding the impact of the accounting presentation change described above, outside processing fee expense increased $11 million, largely due to third-party processing expenses associated with merchant payment processing services, as discussed under the "Noninterest Income" subheading above, including up-front costs incurred for converting customers to the new vendor providing the services, as well as smaller increases in other outside processing expenses related to revenue-generating activities.

Noninterest expenses were $895 million for the six months ended June 30, 2015, an increase of $85 million compared to $810 million for the six months ended June 30, 2014. Excluding the $88 million impact of the above-described accounting presentation change, noninterest expenses decreased $3 million in the six months ended June 30, 2015, compared to the same period in the prior year, for substantially the same reasons as described in the quarterly discussion above.

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. Note 22 to the consolidated financial statements in the Corporation's 2014 Annual Report describes the Corporation's segment reporting methodology.

45

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

Business Segments

The Corporation's operations are strategically aligned into three major business segments: the Business Bank, the Retail Bank and Wealth Management. These business segments are differentiated based upon the products and services provided. In addition to the three major business segments, Finance is also reported as a segment. The Other category includes items not directly associated with these business segments or the Finance segment. The performance of the business segments is not comparable with the Corporation's consolidated results and is not necessarily comparable with similar information for any other financial institution. Additionally, because of the interrelationships of the various segments, the information presented is not indicative of how the segments would perform if they operated as independent entities. Note 13 to the consolidated financial statements describes the business activities of each business segment and presents financial results of these business segments for the three- and six-month periods ended June 30, 2015 and 2014.

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

	Six Months Ended June 30,
(dollar amounts in millions)	2015					2014
Business Bank	$	371		83	%	$	395		84	%
Retail Bank	35			8		26			6
Wealth Management	42			9		49			10
	448			100	%	470			100	%
Finance	(179		)			(183		)
Other (a)	—					3
Total	$	269				$	290

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

The Business Bank's net income of $371 million for the six months ended June 30, 2015decreased $24 million compared to the six months ended June 30, 2014. Net interest income (FTE) of $744 million for the six months ended June 30, 2015 was unchanged compared to the same period in the prior year, as the benefit from a $2.3 billion increase in average loans and the funds transfer pricing (FTP) benefit provided by a $3.0 billion increase in average deposits were offset by a decrease in accretion of the purchase discount on the acquired loan portfolio, lower loan yields and a lower FTP crediting rate.The provision for credit losses increased $34 million to $86 million for the six months ended June 30, 2015, compared to the same period in the prior year. The increase in the provision primarily reflected the impact of loan growth and increased reserves for loans related to energy, as a result of an increase in criticized loans and the impact of continued volatility and sustained lower energy prices. In addition, Corporate Banking contributed to the increase in the provision. These increases were partially offset by improvements in credit quality in Commercial Real Estate. Net loan charge-offs of $31 million increased $11 million in the six months ended June 30, 2015, compared to the same period in the prior year, primarily reflecting increases in general Middle Market and Corporate Banking, partially offset by decreases in Commercial Real Estate and Technology and Life Sciences. Excluding the impact of the change in accounting presentation for a card program, noninterest income for the six months ended June 30, 2015 increased $3 million from the comparable period in the prior year, primarily reflecting increases of $5 million each in card fees and commercial lending fees, partially offset by a $4 million decrease in warrant income. Excluding the impact of the change in accounting presentation for a card program, noninterest expenses for the six months ended June 30, 2015 decreased $1 million compared to the same period in the prior year. The decrease primarily reflected a $31 million decrease in litigation-related expense, mostly offset by a $15 million increase in corporate overhead; a $10 million increase in outside processing expenses, largely due to the third-party processing expenses associated with merchant payment processing services resulting from a change to the Corporation's strategy for providing merchant services; and a $5 million increase in salaries and benefits expense, primarily reflecting the impact of merit increases.

Net income for the Retail Bank of $35 million for the six months ended June 30, 2015 increased $9 million, compared to $26 million for the six months ended June 30, 2014. Net interest income (FTE) of $307 million increased $6 million in the six months ended June 30, 2015, primarily due to the benefit provided by a $177 million increase in average loans, the FTP benefit provided by an $818 million increase in average deposits and lower deposit rates, partially offset by a lower FTP crediting rate and a decrease in accretion of the purchase discount on the acquired loan portfolio. The provision for credit losses was a benefit of $16 million for the six months ended June 30, 2015, a decrease of $11 million from the comparable period in the prior year,

46

reflecting decreases in the consumer loan portfolio and Small Business. Net loan charge-offs were $2 million for the six months ended June 30, 2015 compared to $6 million in the same period for the prior year. Noninterest income of $88 million for the six months ended June 30, 2015 increased $6 million compared to the comparable period in the prior year, due to small increases in several fee categories. Noninterest expenses of $357 million for the six months ended June 30, 2015 increased $9 million from the comparable period in the prior year, primarily due to an increase of $4 million in salaries and benefits expense, primarily reflecting the impact of merit increases, and an increase of $5 million in outside processing expenses related to revenue-generating activities.

Wealth Management's net income of $42 million for the six months ended June 30, 2015 decreased $7 million, compared to $49 million for the six months ended June 30, 2014. Net interest income (FTE) of $88 million for the six months ended June 30, 2015 decreased $1 million compared to the same period in the prior year, primarily reflecting a decrease in net FTP credits and lower loan yields, partially offset by the benefit from a $111 million increase in average loans and the FTP benefit provided by a $429 million increase in average deposits. The provision for credit losses was a benefit of $10 million for the six months ended June 30, 2015, compared to a benefit of $18 million for the same period in the prior year. Net loan recoveries were $7 million for the six months ended June 30, 2015, compared to net recoveries of $5 million for the comparable prior year period. Noninterest income of $118 million decreased $4 million, primarily reflecting a $3 million decrease from securities losses of $2 million for the six months ended June 30, 2015 compared to a $1 million gain for the same period in 2014. Noninterest expenses of $151 million for the six months ended June 30, 2015 decreased $1 million from the comparable period in the prior year, primarily due to a $4 million decrease in litigation-related expenses, partially offset by small increases in several noninterest expense categories.

The net loss in the Finance segment was $179 million for the six months ended June 30, 2015, compared to a net loss of $183 million for the six months ended June 30, 2014. Net interest expense (FTE) of $308 million for the six months ended June 30, 2015 decreased $10 million, compared to the six months ended June 30, 2014, primarily reflecting a decrease in net FTP expense as a result of lower rates paid to the business segments under the Corporation's internal FTP methodology.

Market Segments

Market segment results are provided for the Corporation's three largest geographic markets: Michigan, California and Texas. In addition to the three largest geographic markets, Other Markets is also reported as a market segment. The Finance & Other category includes the Finance segment and the Other category as previously described in the "Business Segments" section of this financial review. Note 13 to these consolidated financial statements presents a description of each of these market segments as well as the financial results for the three- and six-month periods ended June 30, 2015 and 2014.

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

	Six Months Ended June 30,
(dollar amounts in millions)	2015					2014
Michigan	$	172		39	%	$	142		30	%
California	144			32		126			27
Texas	46			10		86			18
Other Markets	86			19		116			25
	448			100	%	470			100	%
Finance & Other (a)	(179		)			(180		)
Total	$	269				$	290

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

The Michigan market's net income of $172 million for the six months ended June 30, 2015 increased $30 million, compared to $142 million for the six months ended June 30, 2014. Net interest income (FTE) of $357 million for the six months ended June 30, 2015 decreased $7 million from the comparable period in the prior year, primarily due to lower loan yields, the impact of a $221 million decrease in average loans and a lower FTP crediting rate, partially offset by the FTP benefit provided by a $1.0 billion increase in average deposits and lower deposit rates. The provision for credit losses was a benefit of $21 million for the six months ended June 30, 2015, compared to a benefit of $5 million for the comparable period in the prior year. Net loan charge-offs were $1 million for the six months ended June 30, 2015, compared to $10 million for the comparable period in the prior year, primarily reflecting decreases in Commercial Real Estate and Small Business, partially offset by an increase in general Middle Market. Noninterest income of $166 million for the six months ended June 30, 2015 decreased $7 million from the comparable period in the prior year, reflecting small decreases in several noninterest income categories. Noninterest expenses of $283 million for the six months ended June 30, 2015 decreased $37 million from the comparable period in the prior year, primarily reflecting a $32 million decrease in litigation-related expense and small decreases in several other noninterest expense categories, partially offset by a $6 million increase in outside processing expense, in part due to the third-party processing expenses associated with merchant payment processing services resulting from a change to the Corporation's strategy.

47

The California market's net income of $144 million increased $18 million in the six months ended June 30, 2015, compared to $126 million for the six months ended June 30, 2014. Net interest income (FTE) of $357 million for the six months ended June 30, 2015 increased $8 million from the comparable period in the prior year, primarily due to the benefit provided by a $1.2 billion increase in average loans and the FTP benefit provided by a $2.0 billion increase in average deposits, partially offset by lower loan yields and a lower FTP crediting rate. The provision for credit losses was $1 million for the six months ended June 30, 2015, compared to $25 million for the comparable period in the prior year. Net loan charge-offs of $6 million in the six months ended June 30, 2015 decreased $9 million compared to the six months ended June 30, 2014, primarily reflecting a decrease in Technology and Life Sciences. Noninterest income of $74 million for the six months ended June 30, 2015 increased $1 million compared to the six months ended June 30, 2014, primarily reflecting small increases in several noninterest income categories, partially offset by a $3 million decrease in warrant income. Noninterest expenses of $199 million for the six months ended June 30, 2015 increased $2 million from the comparable period in the prior year, primarily reflecting small increases in several noninterest expense categories, partially offset by a $3 million decrease in litigation-related expense.

The Texas market's net income of $46 million for the six months ended June 30, 2015 decreased $40 million from $86 million for the six months ended June 30, 2014. Net interest income (FTE) of $260 million for the six months ended June 30, 2015 decreased $13 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, lower loan yields and a decrease in net FTP credits due to a lower FTP crediting rate, partially offset by the benefit provided by a $727 million increase in average loans. The provision for credit losses of $64 million for the six months ended June 30, 2015 increased $35 million from the comparable period in the prior year, primarily reflecting increased reserves for loans related to energy and the impact of loan growth, partially offset by credit quality improvements in the remainder of the portfolio. Net loan charge-offs were $8 million for both six-month periods ended June 30, 2015 and 2014. Noninterest income of $67 million for the six months ended June 30, 2015 decreased $2 million compared to the comparable period in the prior year, primarily due to small decreases in several noninterest income categories. Noninterest expenses of $189 million for the six months ended June 30, 2015 increased $10 million compared to the six months ended June 30, 2014, primarily reflecting a $4 million increase in corporate overhead and a $3 million increase in salaries and benefits expense.

Net income in Other Markets of $86 million for the six months ended June 30, 2015 decreased $30 million from the six months ended June 30, 2014. Net interest income (FTE) of $165 million for the six months ended June 30, 2015 increased $17 million from the comparable period in the prior year, primarily due to the benefit provided by a $904 million increase in average loans and the FTP benefit provided by a $1.1 billion increase in average deposits, partially offset by the impact of a lower FTP crediting rate. The provision for credit losses of $16 million increased $36 million in the six months ended June 30, 2015, compared to a benefit of $20 million for the same period in the prior year, primarily reflecting increases in Corporate Banking and general Middle Market. Net loan charge-offs were $11 million for the six months ended June 30, 2015, compared to net recoveries of $12 million for the comparable period in the prior year, primarily reflecting increases in Corporate Banking, Technology and Life Sciences, and general Middle Market. Excluding the impact of the change in accounting presentation for a card program, noninterest income for the six months ended June 30, 2015 increased $13 million from the comparable period in the prior year, primarily reflecting increases of $3 million in fiduciary income, $2 million in customer derivative income and small increases in several other noninterest income categories, partially offset by a $3 million decrease from securities losses of $2 million for the six months ended June 30, 2015 compared to a $1 million gain for the same period in 2014. Excluding the impact of the change in accounting presentation for a card program, noninterest expenses for the six months ended June 30, 2015 increased $32 million compared to the same period in the prior year, primarily due to an increase of $8 million in outside processing expenses in part due to the third-party processing expenses associated with merchant payment processing services resulting from a change to the Corporation's strategy, an $8 million increase in corporate overhead expense and small increases in several categories of noninterest expense.

The net loss for the Finance & Other category of $179 million in the six months ended June 30, 2015 decreased $1 million compared to the six months ended June 30, 2014. For further information, refer to the Finance segment discussion under the "Business Segments" subheading above.

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

	June 30,
	2015	2014
Michigan	214	214
Texas	133	135
California	103	104
Other Markets:
Arizona	19	18
Florida	7	9
Canada	1	1
Total	477	481

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FINANCIAL CONDITION

Total assets were $69.9 billion at June 30, 2015, an increase of $759 million from $69.2 billion at December 31, 2014, primarily reflecting increases of $1.1 billion in total loans, $168 million in investment securities and $122 million in cash and due from banks, partially offset by decreases of $456 million in accrued income and other assets and $228 million in interest-bearing deposits with banks. On an average basis, total assets decreased $344 million to $69.0 billion in the second quarter 2015, compared to $69.3 billion in the fourth quarter 2014, resulting primarily from a decrease of $2.5 billion in average interest-bearing deposits with banks, partially offset by increases of $1.5 billion in average loans and $571 million in average investment securities.

The following tables provide information about the change in the Corporation's average loan portfolio in the second quarter 2015, compared to the fourth quarter 2014.

	Three Months Ended							Percent Change
(dollar amounts in millions)	June 30, 2015		December 31, 2014		Change
Average Loans:
Commercial loans by business line:
General Middle Market	$	10,484	$	10,156	$	328		3	%
National Dealer Services	4,350		4,115		235			6
Energy	3,384		3,443		(59		)	(2	)
Technology and Life Sciences	2,753		2,531		222			9
Environmental Services	848		885		(37		)	(4	)
Entertainment	566		557		9			2
Total Middle Market	22,385		21,687		698			3
Corporate Banking	3,175		3,305		(130		)	(4	)
Mortgage Banker Finance	2,089		1,396		693			50
Commercial Real Estate	848		862		(14		)	(2	)
Total Business Bank commercial loans	28,497		27,250		1,247			5
Total Retail Bank commercial loans	1,933		1,767		166			9
Total Wealth Management commercial loans	1,358		1,374		(16		)	(1	)
Total commercial loans	31,788		30,391		1,397			4
Real estate construction loans	1,807		1,920		(113		)	(6	)
Commercial mortgage loans	8,672		8,609		63			1
Lease financing	795		818		(23		)	(3	)
International loans	1,453		1,455		(2		)	—
Residential mortgage loans	1,877		1,821		56			3
Consumer loans	2,441		2,347		94			4
Total loans	$	48,833	$	47,361	$	1,472		3	%
Average Loans By Geographic Market:
Michigan	$	13,290	$	13,142	$	148		1	%
California	16,429		15,777		652			4
Texas	11,254		11,327		(73		)	(1	)
Other Markets	7,860		7,115		745			10
Total loans	$	48,833	$	47,361	$	1,472		3	%

Average loans for the three months ended June 30, 2015 increased $1.5 billion, compared to the three months ended December 31, 2014, led by an increase of $1.4 billion, or 4 percent in average commercial loans. The $1.4 billion increase in average commercial loans primarily reflected increases of $693 million in Mortgage Banker Finance, $328 million in general Middle Market, $235 million in National Dealer Services, $222 million in Technology and Life Sciences and $166 million in Small Business, partially offset by a $130 million decrease in Corporate Banking. In general, Middle Market serves customers with annual revenue between $20 million and $500 million, while Corporate serves customers with revenue over $500 million. Changes in average total loans by geographic market are provided in the table above.

Investment securities increased $168 million to $10.2 billion at June 30, 2015, from $10.1 billion at December 31, 2014, primarily reflecting the purchase of $200 million of U.S. Treasury securities in June, 2015. Net unrealized gains on investment securities available-for-sale decreased $15 million to a net unrealized gain of $66 million at June 30, 2015, compared to $81 million at December 31, 2014. On an average basis, investment securities increased $571 million in the second quarter 2015, compared to the fourth quarter 2014, primarily reflecting the purchase of approximately $500 million of U.S. Treasury securities in late December, 2014.

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The Corporation has been purchasing U.S. Treasury securities and reinvesting paydowns on residential mortgage-backed securities (RMBS) issued by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation (government-sponsored enterprises or GSEs) with RMBS issued by the Government National Mortgage Association (GNMA), as U.S. Treasury and GNMA securities receive more favorable treatment under Liquidity Coverage Ratio (LCR) rules, as further discussed under the "Wholesale Funding" subheading in the "Risk Management" section of this financial review. The following table provides a summary of securities issued and/or guaranteed by the U.S. government, its agencies and GSEs.

(dollar amounts in millions)	June 30, 2015		December 31, 2014
U.S. Treasury and other U.S. government agency securities	$	729	$	526
RMBS issued by GNMA	2,827		2,111
RMBS issued by GSEs	6,387		7,098
Total RMBS	9,214		9,209
Total	$	9,943	$	9,735

Total liabilities increased $638 million to $62.4 billion at June 30, 2015, compared to $61.8 billion at December 31, 2014, primarily reflecting increases of $774 million in total deposits and $166 million in medium- and long-term debt, partially offset by a decrease of $242 million in accrued expenses and other liabilities. On an average basis, total liabilities decreased $338 million in the second quarter 2015, compared to the fourth quarter 2014, primarily due to a decrease of $362 million in total deposits, comprising a $223 million decrease in interest-bearing deposits and a $139 million decrease in noninterest-bearing deposits. The decrease in average total deposits primarily reflected decreases in Corporate Banking ($625 million) and Commercial Real Estate ($220 million), partially offset by an increase in Retail Banking ($447 million). By geographic market, average total deposits decreased in California ($753 million), partially offset by increases in Other Markets ($187 million), Michigan ($176 million) and Texas ($134 million).

Capital

Total shareholders' equity increased $121 million to $7.5 billion at June 30, 2015, compared to December 31, 2014. The following table presents a summary of changes in total shareholders' equity in the six months ended June 30, 2015.

(in millions)
Balance at January 1, 2015				$	7,402
Net income				269
Cash dividends declared on common stock				(73		)
Purchase of common stock				(115		)
Purchase and retirement of warrants				(10		)
Other comprehensive income:
Investment securities	$	(7	)
Defined benefit and other postretirement plans	23
Total other comprehensive income				16
Issuance of common stock under employee stock plans				10
Share-based compensation				24
Balance at June 30, 2015				$	7,523

The Corporation periodically conducts stress tests to evaluate potential impacts to the Corporation's forecasted financial condition under various economic scenarios and business conditions. These stress tests are a normal part of the Corporation's overall risk management and capital planning process and are part of the forecasting process used by the Corporation to conduct the enterprise-wide stress test that was part of the Federal Reserve's Comprehensive Capital Analysis and Review (CCAR). For additional information about risk management processes, refer to the "Risk Management" sections of this financial review and the Corporations 2014 Annual Report.

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The Federal Reserve completed its 2015 CCAR review in March 2015 and did not object to the Corporation's capital plan and capital distributions contemplated in the plan. The plan provides for up to $393 million in equity repurchases for the five-quarter period ending June 30, 2016. In the second quarter 2015, the Corporation's equity repurchases totaled $59 million, including $49 million of share repurchases and $10 million of warrant repurchases. The pace of equity repurchases is expected to be in line with the Corporation's performance and a rise in interest rates. The following table summarizes the Corporation's repurchase activity during the six months ended June 30, 2015.

(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 and Warrants Purchased (b)	Average Price Paid Per  Share		Average Price Paid Per  Warrant (c)
Total first quarter 2015	1,354	12,728		1,517	$	43.38	$	—
April 2015	274	23,072	(d)	277	45.87		—
May 2015	567	22,505		574	48.51		—
June 2015	672	21,833		672	49.76		20.70
Total second quarter 2015	1,513	21,833		1,523	48.00		—
Total 2015	2,867	21,833		3,040	$	45.24	$	20.70

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

(b) Includes approximately 172,000 shares purchased pursuant to deferred compensation plans and shares purchased from employees to pay for taxes related to restricted stock vesting under the terms of an employee share-based compensation plan during the six months ended June 30, 2015. These transactions are not considered part of the Corporation's repurchase program.

(c) The Corporation repurchased 500,000 warrants under the repurchase program during the six months ended June 30, 2015. Shares withheld in connection with the exercise of warrants are not included in the total number of shares or warrants purchased in the above table. Upon exercise of a warrant, the number of shares with a value equal to the aggregate exercise price is withheld from an exercising warrant holder as payment (known as a "net exercise provision"). During the six months ended June 30, 2015, the Corporation withheld the equivalent of approximately 1,261,000 shares to cover an aggregate of $64.8 million in exercise price and issued approximately 934,000 shares to the exercising warrant holders.

(d) Includes April 28, 2015 equity repurchase authorization for up to an additional 10.6 million shares and share-equivalents.

On April 28, 2015, the Board of Directors of the Corporation (the Board) approved a 1-cent increase in the quarterly dividend to $0.21 per share. The Board also authorized the repurchase of up to an additional 10.0 million shares of Comerica Incorporated outstanding common stock, in addition to the 2.1 million shares remaining at March 31, 2015 under the Board's prior authorizations for the share repurchase program initially approved in November 2010. Including the April 28, 2015 authorization, a total of 40.3 million shares has been authorized for repurchase under the share repurchase program since its inception in 2010. On April 28, 2015, the Board also authorized the repurchase of up to an additional 2.6 million warrants, in addition to the 10.6 million warrants remaining at March 31, 2015 under an authorization initially approved in November 2010. There is no expiration date for the Corporation's equity repurchase program.

In July 2013, U.S. banking regulators issued a final rule for the U.S. adoption of the Basel III regulatory capital framework (Basel III). Basel III includes a more stringent definition of capital and introduces a new common equity Tier 1 (CET1) capital requirement; sets forth two comprehensive methodologies for calculating risk-weighted assets (RWA), a standardized approach and an advanced approach; introduces two new capital buffers, a conservation buffer and a countercyclical buffer (applicable to advanced approaches entities); establishes a new supplemental leverage ratio (applicable to advanced approaches entities); and sets out minimum capital ratios and overall capital adequacy standards. As a banking organization subject to the standardized approach, Basel III became effective for the Corporation on January 1, 2015. Certain deductions and adjustments to regulatory capital phase in starting January 1, 2015 and will be fully implemented on January 1, 2018. The capital conservation buffer phases in beginning January 1, 2016 and will be fully implemented on January 1, 2019.

Under Basel III, CET1 capital predominantly includes common shareholders’ equity, less certain deductions for goodwill, intangible assets and deferred tax assets that arise from net operating losses and tax credit carry-forwards. Additionally, the Corporation has elected to permanently exclude capital in accumulated other comprehensive income (AOCI) related to debt and equity securities classified as available-for-sale as well as for defined benefit postretirement plans from CET1, an option available to standardized approach entities under Basel III. Tier 1 capital incrementally includes noncumulative perpetual preferred stock. Tier 2 capital includes Tier 1 capital as well as subordinated debt qualifying as Tier 2 and qualifying allowance for credit losses. Certain deductions and adjustments to CET1 capital, Tier 1 capital and Tier 2 capital are subject to phase-in through December 31, 2017.

Comerica computes RWA using the standardized approach. Under the standardized approach, RWA is generally based on supervisory risk-weightings which vary by counterparty type and asset class. Under the Basel III standardized approach, capital is required for credit risk RWA, to cover the risk of unexpected losses due to failure of a customer or counterparty to meet its

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financial obligations in accordance with contractual terms; and if trading assets and liabilities exceed certain thresholds, capital is also required for market risk RWA, to cover the risk of losses due to adverse market movements or from position-specific factors.

The following table presents the minimum ratios required to be considered "adequately capitalized" as of June 30, 2015 and December 31, 2014.

	June 30, 2015				December 31, 2014
	Basel III Rules				Basel I Rules
Common equity tier 1 capital to risk-weighted assets		4.5	%	(a)		n/a
Tier 1 capital to risk-weighed assets		6.0		(a)		4.0	%
Total capital to risk-weighted assets		8.0		(a)		8.0
Tier 1 capital to adjusted average assets (leverage ratio)		4.0				3.0

(a) In order to avoid restrictions on capital distributions and discretionary bonuses, the Corporation will also be required to maintain a minimum capital conservation buffer, which phases in at 0.625% beginning on January 1, 2016 and ultimately increases to 2.5% on January 1, 2019.

n/a - not applicable.

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

	June 30, 2015				December 31, 2014
	(Basel III Rules)				(Basel I Rules)
(dollar amounts in millions)	Capital/Assets		Ratio		Capital/Assets		Ratio
Common equity tier 1 (a)	$	7,280	10.40	%	n/a		n/a
Tier 1 common (b)	n/a		n/a		$	7,169	10.50	%
Tier 1 risk-based (a)	7,280		10.40		7,169		10.50
Total risk-based (a)	8,663		12.37		8,543		12.51
Leverage (a)	7,280		10.57		7,169		10.35
Tangible common equity (b)	6,873		9.92		6,752		9.85
Risk-weighted assets (a)	70,028				68,273

(a) June 30, 2015 capital, risk-weighted assets and ratios are estimated.

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

n/a - not applicable.

RISK MANAGEMENT

The following updated information should be read in conjunction with the "Risk Management" section on pages F-21 through F-36 in the Corporation's 2014 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.

While U.S. Gross Domestic Product (GDP) was relatively flat in the first quarter of 2015, it has shown some positive trends in the second quarter of 2015. Job growth and employment figures continue to slowly improve while manufacturing output is higher and inflation remains low. The Federal Reserve continues to set expectations for a near-term movement towards interest rate increases and monetary policy normalization. At the same time, lower energy prices have persisted and geopolitical tensions remain.

While the overall credit quality of the loan portfolio remained strong in the second quarter of 2015, reserves increased, primarily reflecting an increase in criticized energy and energy-related exposure, as well as uncertainty due to continued volatility and the impact of sustained lower oil and gas prices.

The allowance for loan losses was $618 million at June 30, 2015, compared to $594 million at December 31, 2014, an increase of $24 million, or 4 percent. The increase in the allowance primarily reflected increased reserves for loans related to energy and, to a lesser extent, Technology and Life Sciences, partially offset by credit quality improvements in the remainder of the portfolio.

Energy and energy-related loans at June 30, 2015 included approximately $3.3 billion of outstanding loans in the Energy business line as well as approximately $725 million of loans in other lines of business to companies that have a sizable portion of

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their revenue related to energy or could be otherwise disproportionately negatively impacted by prolonged lower oil and gas prices ("energy-related"). The Corporation generally reviews commitments to energy exploration and production (EP) customers semi-annually, in conjunction with scheduled borrowing base re-determinations. Internal risk ratings for all loans are reviewed at least annually, or more frequently upon the occurrence of a circumstance that affects the credit risk of the loan. During the six months ended June 30, 2015, approximately 85 percent of the internal risk ratings for borrowers in the Energy business line were reviewed, including approximately 95 percent of EP customers, 70 percent of energy services customers and 55 percent of midstream customers. The reviews resulted in some internal risk rating downgrades, which were incorporated into the quantitative component of the allowance. More than 90 percent of the loans in the Energy business line are Shared National Credits (SNC), and the above results include the results of the SNC exam completed in the second quarter 2015. In addition, the Corporation continued to incorporate a qualitative reserve component for energy and energy-related loans due to the uncertainty associated with continued volatility and the impact of sustained lower oil and gas prices. Refer to the "Energy Lending" subheading later in this section for further discussion of the Corporation's portfolio of energy and energy-related loans.

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 $50 million at June 30, 2015 compared to $41 million at December 31, 2014. The $9 million increase in the allowance for credit losses on lending-related commitments primarily reflected the impact of downgrades of energy and energy-related unfunded commitments and issued letters of credit.

For additional information regarding the allowance for credit losses, refer to page F-37 in the "Critical Accounting Policies" section and pages F-54 through F-55 in Note 1 to the consolidated financial statements of the Corporation's 2014 Annual Report.

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

(dollar amounts in millions)	June 30, 2015			December 31, 2014
Nonaccrual loans:
Business loans:
Commercial	$	186		$	109
Real estate construction	1			2
Commercial mortgage	77			95
Lease financing	11			—
International	9			—
Total nonaccrual business loans	284			206
Retail loans:
Residential mortgage	35			36
Consumer:
Home equity	29			30
Other consumer	1			1
Total consumer	30			31
Total nonaccrual retail loans	65			67
Total nonaccrual loans	349			273
Reduced-rate loans	12			17
Total nonperforming loans	361			290
Foreclosed property	9			10
Total nonperforming assets	$	370		$	300
Nonperforming loans as a percentage of total loans	0.72		%	0.60		%
Nonperforming assets as a percentage of total loans and foreclosed property	0.74			0.62
Allowance for loan losses as a percentage of total nonperforming loans	171			205
Loans past due 90 days or more and still accruing	$	18		$	5
Loans past due 90 days or more and still accruing as a percentage of total loans	0.04		%	0.01		%

Nonperforming assets increased $70 million to $370 million at June 30, 2015, from $300 million at December 31, 2014. The increase in nonperforming assets primarily reflected an increase of $92 million in nonaccrual energy and energy-related loans. Nonperforming assets as a percentage of total loans and foreclosed property was 0.74 percent at June 30, 2015, compared to 0.62 percent at December 31, 2014.

The following table presents a summary of TDRs at June 30, 2015 and December 31, 2014.

(in millions)	June 30, 2015		December 31, 2014
Nonperforming TDRs:
Nonaccrual TDRs	$	39	$	58
Reduced-rate TDRs	12		17
Total nonperforming TDRs	51		75
Performing TDRs (a)	29		43
Total TDRs	$	80	$	118

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

Performing TDRs primarily included $23 million in Small Business Banking and $5 million in Middle Market at June 30, 2015.

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

	Three Months Ended
(in millions)	June 30, 2015			March 31, 2015			December 31, 2014
Balance at beginning of period	$	266		$	273		$	329
Loans transferred to nonaccrual (a)	145			39			41
Nonaccrual business loan gross charge-offs (b)	(31		)	(21		)	(16		)
Loans transferred to accrual status (a)	—			(4		)	(18		)
Nonaccrual business loans sold (c)	(1		)	(2		)	(24		)
Payments/other (d)	(30		)	(19		)	(39		)
Balance at end of period	$	349		$	266		$	273
(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	$	31		$	21		$	16
Retail loans	4			2			4
Total gross loan charge-offs	$	35		$	23		$	20
(c) Analysis of loans sold:
Nonaccrual business loans	$	1		$	2		$	24
Performing criticized loans	—			7			5
Total criticized loans sold	$	1		$	9		$	29
(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 ten borrowers with balances greater than $2 million, totaling $145 million, transferred to nonaccrual status in the second quarter 2015, an increase of $106 million when compared to $39 million in the first quarter 2015. The transfers to nonaccrual greater than $2 million in the second quarter 2015 included $100 million in energy and energy-related loans.

The following table presents the composition of nonaccrual loans by balance and the related number of borrowers at June 30, 2015 and December 31, 2014.

	June 30, 2015			December 31, 2014
(dollar amounts in millions)	Number of Borrowers	Balance		Number of Borrowers	Balance
Under $2 million	1,405	$	141	1,492	$	154
$2 million - $5 million	13	37		15	48
$5 million - $10 million	5	36		3	22
$10 million - $25 million	4	63		2	23
Greater than $25 million	2	72		1	26
Total	1,429	$	349	1,513	$	273

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The following table presents a summary of nonaccrual loans at June 30, 2015 and loans transferred to nonaccrual and net loan charge-offs for the three months ended June 30, 2015, based primarily on North American Industry Classification System (NAICS) categories.

	June 30, 2015				Three Months Ended June 30, 2015
(dollar amounts in millions)	Nonaccrual Loans				Loans Transferred to Nonaccrual (a)				Net Loan Charge-Offs (Recoveries)
Industry Category
Mining, Quarrying and Oil & Gas Extraction (b)	$	90	26	%	$	89	61	%	$	—		—	%
Residential Mortgage	34		10		—		—		1			6
Manufacturing (b)	33		9		39		27		12			67
Real Estate	32		9		—		—		(4		)	(22	)
Services	31		9		—		—		(2		)	(11	)
Contractors (b)	27		8		9		7		(1		)	(6	)
Health Care and Social Assistance	19		5		—		—		—			—
Retail	13		4		5		3		6			33
Holding and Other Investment Companies	13		4		—		—		(1		)	(6	)
Wholesale Trade	4		1		—		—		5			28
Other (c)	53		15		3		2		2			11
Total	$	349	100	%	$	145	100	%	$	18		100	%

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

(b) Included nonaccrual energy and energy-related loans of approximately $90 million in Mining, Quarrying and Oil & Gas Extraction, $9 million in Manufacturing and $20 million in Contractors at June 30, 2015.

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

Loans past due 90 days or more and still accruing interest generally represent loans that are well collateralized and in a continuing process of collection. Loans past due 90 days or more and still accruing interest increased$13 million to $18 million at June 30, 2015, compared to $5 million at December 31, 2014. Loans past due 30-89 days decreased$42 million to $121 million at June 30, 2015, compared to $163 million at December 31, 2014.

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

(dollar amounts in millions)	June 30, 2015			March 31, 2015			December 31, 2014
Total criticized loans	$	2,361		$	2,067		$	1,893
As a percentage of total loans	4.7		%	4.2		%	3.9		%

The $468 million increase in criticized loans in the six months ended June 30, 2015 included an increase of $381 million of energy and energy-related loans.

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

	Three Months Ended
(in millions)	June 30, 2015			March 31, 2015			December 31, 2014
Balance at beginning of period	$	9		$	10		$	11
Acquired in foreclosure	2			2			3
Write-downs	—			(1		)	—
Foreclosed property sold (a)	(2		)	(2		)	(4		)
Balance at end of period	$	9		$	9		$	10
(a) Net gain on foreclosed property sold	$	1		$	—		$	1

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Commercial Real Estate Lending

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

(in millions)	June 30, 2015		December 31, 2014
Real estate construction loans:
Commercial Real Estate business line (a)	$	1,502	$	1,606
Other business lines (b)	293		349
Total real estate construction loans	$	1,795	$	1,955
Commercial mortgage loans:
Commercial Real Estate business line (a)	$	1,928	$	1,790
Other business lines (b)	6,746		6,814
Total commercial mortgage loans	$	8,674	$	8,604

(a) Primarily loans to real estate developers.

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

The Corporation limits risk inherent in its commercial real estate lending activities by limiting exposure to those borrowers directly involved in the commercial real estate markets and adhering to conservative policies on loan-to-value ratios for such loans. Commercial real estate loans, consisting of real estate construction and commercial mortgage loans, totaled $10.5 billion at June 30, 2015, of which $3.4 billion, or 33 percent, were to borrowers in the Commercial Real Estate business line, which includes loans to real estate developers. The remaining $7.1 billion, or 67 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. In the Texas market, commercial real estate loans totaled $2.5 billion at June 30, 2015, of which $1.3 billion were to borrowers in the Commercial Real Estate business line. The remaining $1.2 billion consisted primarily of owner-occupied commercial mortgages. Loans in the Commercial Real Estate business line secured by properties located in Texas totaled $957 million at June 30, 2015, primarily including $525 million for multifamily properties, $130 million for retail properties and $101 million for commercial properties.

The real estate construction loan portfolio primarily contains loans made to long-time customers with satisfactory completion experience. Credit quality in the real estate construction loan portfolio was strong, with $1 million on nonaccrual status at June 30, 2015 compared to $2 million at December 31, 2014 and no real estate construction loan charge-offs in either of the six-month periods ended June 30, 2015 and 2014.

Loans in the commercial mortgage portfolio generally mature within three to five years. Of the $1.9 billion and $1.8 billion of commercial mortgage loans in the Commercial Real Estate business line outstanding at June 30, 2015 and December 31, 2014, respectively, $18 million and $22 million were on nonaccrual status at June 30, 2015 and December 31, 2014, respectively. Commercial mortgage loan net recoveries in the Commercial Real Estate business line were $3 million for the six months ended June 30, 2015, compared to net charge-offs of $5 million for the six months ended June 30, 2014. In other business lines, $59 million and $73 million of commercial mortgage loans were on nonaccrual status at June 30, 2015 and December 31, 2014, respectively. Commercial mortgage loan net recoveries in other business lines were $3 million for the six months ended June 30, 2015, compared to net charge-offs of $2 million for the six months ended June 30, 2014.

Residential Real Estate Lending

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

	June 30, 2015								December 31, 2014
(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	$	396	21	%	$	785	47	%	$	417	23	%	$	795	48	%
California	844		45		585		35		831		46		564		34
Texas	339		18		255		15		337		18		247		15
Other Markets	286		16		57		3		246		13		52		3
Total	$	1,865	100	%	$	1,682	100	%	$	1,831	100	%	$	1,658	100	%

Residential real estate loans consist of traditional residential mortgages and home equity loans and lines of credit. Residential mortgages totaled $1.9 billion at June 30, 2015, and were primarily larger, variable-rate mortgages originated and retained for certain private banking relationship customers. Of the $1.9 billion of residential mortgage loans outstanding, $35 million were on nonaccrual status at June 30, 2015. The home equity portfolio totaled $1.7 billion at June 30, 2015, of which $1.6 billion was outstanding under primarily variable-rate, interest-only home equity lines of credit and $66 million were closed-end

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home equity loans. Of the $1.7 billion of home equity loans outstanding, $29 million were on nonaccrual status at June 30, 2015. A majority of the home equity portfolio was secured by junior liens at June 30, 2015. The residential real estate portfolio is principally located within the Corporation's primary geographic markets. Substantially all residential real estate loans past due 90 days or more are placed on nonaccrual status, and substantially all junior lien home equity loans that are current or less than 90 days past due are placed on nonaccrual status if full collection of the senior position is in doubt. At no later than 180 days past due, such loans are charged off to current appraised values less costs to sell.

Energy Lending

The Corporation has a portfolio of energy and energy-related loans that are included primarily in "commercial loans" in the consolidated balance sheets. The Corporation's energy lending team has over 30 years of experience, with a focus on larger middle market companies. Loans in the Energy business line (approximately 200 relationships) were $3.3 billion, or approximately 7 percent of total loans, at both June 30, 2015 and December 31, 2014, and total exposure, including unused commitments to extend credit and letters of credit, was $6.6 billion and $7.1 billion at June 30, 2015 and December 31, 2014, respectively. More than 90 percent of the loans in the Energy business line are Shared National Credits (SNC), reflecting the Corporation's focus on larger middle market companies that have financing needs that generally exceed internal individual borrower credit risk limits. The Corporation seeks to develop full relationships with SNC borrowers. SNCs are facilities greater than $20 million shared by three or more federally supervised institutions. In addition to energy loans in the Energy business line, the Corporation is monitoring a portfolio of approximately 165 relationships with approximately $725 million outstanding and total exposure of about $1.5 billion at June 30, 2015 of energy-related loans to companies primarily in general Middle Market, Corporate Banking, Small Business, and Technology and Life Sciences.

The following table summarizes information about the Corporation's portfolio of energy and energy-related loans.

June 30, 2015	Outstandings				Updated Risk Rating (a)		Inflows to Nonaccrual (b)		Nonaccrual			Criticized			Net Charge-Offs (b)
(dollar amounts in millions)
Exploration and production (EP)	$	2,316	70	%	97	%	$	58	$	58		$	341		$	0.3
Midstream	463		14		55		—		—			8			—
Services	530		16		71		23		23			99			—
Total Energy business line	3,309		100	%	84		81		81			448			0.3
Energy-related	722						19		38			130			1.8
Total energy and energy-related	$	4,031					$	100	$	119		$	578		$	2.1
As a percentage of total energy and energy-related loans									3		%	14		%

(a) Internal risk rating reviewed during the six-month period ended June 30, 2015.

(b) During the three-month period ended June 30, 2015.

EP generally includes such activities as searching for potential oil and gas fields, drilling exploratory wells and operating active wells. The midstream sector is generally involved in the transportation, storage and marketing of crude and/or refined energy products. The Corporation's energy services customers provide services primarily to the EP sector. As of June 30, 2015, a majority of the Corporation’s EP customers had at least 50 percent of their oil and/or gas production hedged up to the end of 2015. Approximately 95 percent of the amount of loans outstanding in the Energy business line had varying levels and types of collateral at June 30, 2015, including oil and gas reserves and pipelines, equipment, accounts receivable, inventory and other assets, or some combination thereof. Commitments to EP borrowers are generally subject to semi-annual borrowing base re-determinations based on a variety of factors including updated pricing (reflecting market and competitive conditions), energy reserve levels and the impact of hedging. As of the end of June 2015, about 95 percent of semi-annual borrowing base re-determinations for EP borrowers in the Energy line of business were complete, resulting in internal risk rating downgrades for about one-third of those reviewed. The Corporation's allowance methodology carefully considers the various risk elements within its loan portfolio. The allowance for loan losses at June 30, 2015 appropriately considered the changing dynamics in energy and energy-related loans described above, which has resulted in increases in the qualitative and quantitative reserve components for this portfolio for the past three quarterly periods.

Refer to the “Allowance for Credit Losses” subheading earlier in this section for a discussion of changes in the allowance for loan losses as a result of the above-described events.

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 $3.8 billion at June 30, 2015, an increase of $50 million compared to December 31,

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2014. At both June 30, 2015 and December 31, 2014, other loans to automotive dealers in the National Dealer Services business line totaled $2.4 billion, including $1.6 billion of owner-occupied commercial real estate mortgage loans. 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 $1.4 billion and $1.2 billion at June 30, 2015 and December 31, 2014, respectively.

International Exposure

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

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

(in millions)	June 30, 2015		December 31, 2014
European exposure:
Commercial and industrial	$	263	$	211
Banks and other financial institutions	24		52
Total outstanding	287		263
Unfunded commitments and guarantees	335		382
Total European exposure (a)	$	622	$	645

(a) Primarily United Kingdom and the Netherlands. The Corporation had no exposure to Greece, Portugal or Ireland at June 30, 2015 and December 31, 2014.

For further discussion of credit risk, see the "Credit Risk" section of pages F-21 through F-29 in the Corporation's 2014 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 Treasury Department mitigates market and liquidity risk through the actions it takes to manage the Corporation's market, liquidity and capital positions under the direction of ALCO.

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

Interest Rate Risk

Net interest income is the primary source of revenue for the Corporation. Interest rate risk arises in the normal course of business due to differences in the repricing and cash flow characteristics of assets and liabilities, primarily through the Corporation's core business activities of extending loans and acquiring deposits. The Corporation's balance sheet is predominantly characterized by floating-rate loans funded by a combination of core deposits and wholesale borrowings. Approximately 85 percent of the Corporation's loans were floating at June 30, 2015, of which approximately 75 percent were based on LIBOR and 25 percent were based on Prime. This creates sensitivity to interest rate movements due to the imbalance between the floating-rate loan portfolio and the more slowly repricing deposit products. In addition, growth and/or contraction in the Corporation's loans and deposits may lead to changes in sensitivity to interest rate movements in the absence of mitigating actions. Examples of such actions are

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purchasing investment securities, primarily fixed-rate, which provide liquidity to the balance sheet and act to mitigate the inherent interest sensitivity, and hedging the sensitivity with interest rate swaps. The Corporation actively manages its exposure to interest rate risk, with the principal objective of optimizing net interest income and the economic value of equity while operating within acceptable limits established for interest rate risk and maintaining adequate levels of funding and liquidity.

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

Sensitivity of Net Interest Income to Changes in Interest Rates

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

Each scenario includes assumptions such as loan growth, investment security prepayment levels, depositor behavior, yield curve changes, loan and deposit pricing, and overall balance sheet mix and growth. In the +200 scenario, assumptions related to loan growth are based on historical experience. Because deposit balances have continued to grow significantly in this persistent low rate environment, historical depositor behavior may be less indicative of future trends. As a result, the June 30, 2015 +200 scenario now reflects a greater decrease in deposits than we have experienced historically as rates begin to rise. Investment securities modeling includes the replacement of prepayments as well as an estimate of projected growth in High Quality Liquid Assets (HQLA) needed for compliance with the LCR, and expected funding maturities are included. In addition, the model reflects deposit pricing based on historical price movements with short-term interest rates, and loan spreads are held at current levels. Changes in actual economic activity may result in a materially different interest rate environment as well as a balance sheet structure that is different from the changes management included in its simulation analysis.

The table below, as of June 30, 2015 and December 31, 2014, displays the estimated impact on net interest income during the next 12 months by relating the base case scenario results to those from the rising and declining rate scenarios described above.

	Estimated Annual Change
	June 30, 2015					December 31, 2014
(in millions)	Amount			%		Amount			%
Change in Interest Rates:
+200 basis points	$	222		13	%	$	224		13	%
-25 basis points (to zero percent)	(37		)	(2	)	(32		)	(2	)

Sensitivity decreased slightly from December 31, 2014 to June 30, 2015 primarily due to changes in the current balance sheet mix driving a revised forecast, offset by the impact from the addition of HQLA for the LCR and the modeled reduction in deposit growth in the +200 scenario discussed above. The risk to declining interest rates is limited as a result of the inability of the current low level of rates to fall significantly.

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The table below, as of June 30, 2015, illustrates the estimated sensitivity of the above results to a change in deposit balance assumptions in the +200 scenario, with all other assumptions held constant. In this analysis, average noninterest-bearing deposit run-off in the 12-month period has been increased by $1 billion and $3 billion from the historical run-off experience included in the standard +200 scenario presented above and assumes the deposit run-off reduces excess reserves and increases purchased funds. The analysis is provided as an indicator of the sensitivity of net interest income to the modeled deposit run-off assumption. It is not meant to reflect management's expectation or best estimate. Actual deposit levels may vary from those reflected.

	+200 Basis Points
(in millions)	Estimated Annual Change
June 30, 2015	Amount		%
Incremental Average Decrease in Noninterest-bearing Deposit Balances:
$1 billion	$	211	13	%
$3 billion	188		11

Sensitivity of Economic Value of Equity to Changes in Interest Rates

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

The table below, as of June 30, 2015 and December 31, 2014, displays the estimated impact on the economic value of equity from the interest rate scenario described above.

	June 30, 2015					December 31, 2014
(in millions)	Amount			%		Amount			%
Change in Interest Rates:
+200 basis points	$	1,192		10	%	$	1,218		10	%
-25 basis points (to zero percent)	(275		)	(2	)	(293		)	(2	)

The change in the sensitivity of the economic value of equity to a 200 basis point parallel increase in rates between December 31, 2014 and June 30, 2015 was primarily driven by changes in market interest rates at the middle to long end of the curve, which most significantly impact the value of deposits without a stated maturity.

Wholesale Funding

The Corporation may access the purchased funds market when necessary, which includes foreign office time deposits and short-term borrowings. Capacity for incremental purchased funds at June 30, 2015 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 $155 million at June 30, 2015, compared to $251 million at December 31, 2014. At June 30, 2015, the Bank had pledged loans totaling $26 billion which provided for up to $20 billion of available collateralized borrowing with the FRB.

The Bank is a member of the FHLB of Dallas, Texas, which provides short- and long-term funding to its members through advances collateralized by real estate-related assets. Actual borrowing capacity is contingent on the amount of collateral available to be pledged to the FHLB. At June 30, 2015, real estate-related loans pledged to the FHLB as blanket collateral provided for potential future borrowings of approximately $6 billion. As of June 30, 2015, the Corporation did not have any outstanding borrowings from the FHLB. Additionally, as of June 30, 2015 the Bank had the ability to issue up to $14.5 billion of debt under an existing $15 billion 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.

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The ability of the Corporation and the Bank to raise funds at competitive rates is impacted by rating agencies' views of the credit quality, liquidity, capital and earnings of the Corporation and the Bank. As of June 30, 2015, 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
June 30, 2015	Rating	Outlook	Rating	Outlook
Standard and Poor’s	A-	Negative	A	Negative
Moody’s Investors Service (a)	A3	Stable	A2	Stable
Fitch Ratings	A	Stable	A	Stable
DBRS	A	Stable	A (High)	Stable

(a) In March 2015, Moody's Investors Service put global bank ratings on review following the publication of revised bank rating methodology. While the outlook for both Comerica Incorporated and Comerica Bank continue to be "Stable", Moody’s released a preliminary indication of an “A3” rating for Comerica Bank long-term senior unsecured debt.

The Corporation satisfies liquidity requirements with either liquid assets or various funding sources. Liquid assets, which totaled $13.5 billion at June 30, 2015, compared to $13.3 billion at December 31, 2014, 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. At June 30, 2015, the Corporation held deposits at the FRB of $4.6 billion, compared to $4.9 billion at December 31, 2014.

In September 2014, U.S. banking regulators issued a final rule implementing a quantitative liquidity requirement in the U.S. generally consistent with the LCR minimum liquidity measure established under the Basel III liquidity framework. Under the rule, the Corporation is subject to a modified LCR standard, which requires a financial institution to hold a minimum level of HQLA to fully cover modified net cash outflows under a 30-day systematic liquidity stress scenario. The rule is effective for the Corporation on January 1, 2016. During the transition year, 2016, the Corporation will be required to maintain a minimum LCR of 90 percent. Beginning January 1, 2017, and thereafter, the minimum required LCR will be 100 percent.

In the second quarter 2015, the Bank issued $500 million of senior debt maturing in 2020 and swapped it to floating at six-month LIBOR plus 75 basis points. Of the proceeds, $200 million was invested in five-year Treasury notes. To reach full compliance with the LCR rule and provide a buffer for normal volatility in balance sheet dynamics, the Corporation expects to add up to $3 billion of additional HQLA over the next 18 months, which may be funded with additional wholesale funds in manageable increments, tapping a variety of sources. On July 22, 2015, the Bank issued $350 million of 4.00% subordinated notes, swapped to floating at 6-month LIBOR plus 1.478%, due July 27, 2025 and $175 million of 2.50% senior notes, swapped to floating at 6-month LIBOR plus 0.6348%, due June 2, 2020. The proceeds of both issuances will assist the Corporation in meeting its LCR target.

The Basel III liquidity framework includes a second minimum liquidity measure, the Net Stable Funding Ratio (NSFR), which requires the amount of available longer-term, stable sources of funding to be at least 100 percent of the required amount of longer-term stable funding over a one-year period. On October 31, 2014, the Basel Committee on Banking Supervision issued its final NSFR rule, which was originally introduced in 2010 and revised in January 2014. U.S. banking regulators have announced that they expect to issue proposed rules to implement the NSFR in advance of its scheduled global implementation in 2018. While uncertainty exists in the final form and timing of the U.S. rule implementing the NSFR and whether or not the Corporation will be subject to the full requirements, the Corporation is closely monitoring the development of the rule.

The Corporation regularly evaluates its ability to meet funding needs in unanticipated, stressed environments. In conjunction with the quarterly 200 basis point interest rate simulation analyses, discussed in the “Interest Rate Sensitivity” section of this financial review, liquidity ratios and potential funding availability are examined. Each quarter, the Corporation also evaluates its ability to meet liquidity needs under a series of broad events, distinguished in terms of duration and severity. The evaluation as of June 30, 2015 projected that sufficient sources of liquidity were available under each series of events.

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 2014 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, 2014, 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

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fully on pages F-37 through F-40 in the Corporation's 2014 Annual Report. As of the date of this report, there have been no significant changes to the Corporation's critical accounting policies or estimates.

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SUPPLEMENTAL FINANCIAL DATA

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

(dollar amounts in millions)	June 30, 2015			December 31, 2014
Tier 1 Common Capital Ratio:
Tier 1 and Tier 1 common capital (a)	n/a			$	7,169
Risk-weighted assets (a)	n/a			68,269
Tier 1 and Tier 1 common risk-based capital ratio	n/a			10.50		%
Tangible Common Equity Ratio:
Common shareholders' equity	$	7,523		$	7,402
Less:
Goodwill	635			635
Other intangible assets	15			15
Tangible common equity	$	6,873		$	6,752
Total assets	$	69,945		$	69,186
Less:
Goodwill	635			635
Other intangible assets	15			15
Tangible assets	$	69,295		$	68,536
Common equity ratio	10.76		%	10.70		%
Tangible common equity ratio	9.92			9.85
Tangible Common Equity per Share of Common Stock:
Common shareholders' equity	$	7,523		$	7,402
Tangible common equity	6,873			6,752
Shares of common stock outstanding (in millions)	178			179
Common shareholders' equity per share of common stock	$	42.18		$	41.35
Tangible common equity per share of common stock	38.53			37.72

(a) Tier 1 capital and risk-weighted assets as defined by Basel I risk-based capital rules.

n/a - not applicable.

The Tier 1 common capital ratio removes preferred stock and qualifying trust preferred securities from Tier 1 capital as defined by and calculated in conformity with Basel I risk-based capital rules in effect through December 31, 2014. Effective January 1, 2015, regulatory capital components and risk-weighted assets are defined by and calculated in conformity with Basel III risk-based capital rules. 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.

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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, 2014 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.

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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†	2015 Comerica Incorporated Incentive Plan for Non-Employee Directors (filed as Exhibit 10.4 to Registrant's Quarterly Report on Form 10-Q for the quarter ended March 31, 2015, and incorporated herein by reference).
31.1	Chairman 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 June 30, 2015, 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.

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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: July 27, 2015

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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†	2015 Comerica Incorporated Incentive Plan for Non-Employee Directors (filed as Exhibit 10.4 to Registrant's Quarterly Report on Form 10-Q for the quarter ended March 31, 2015, and incorporated herein by reference).
31.1	Chairman 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 June 30, 2015, 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.

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EX-31.1

Exhibit 31.1

Chairman 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 June 30, 2015 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:	July 27, 2015	/s/ Ralph W. Babb, Jr.
		Ralph W. Babb, Jr.
		Chairman 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 June 30, 2015 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:	July 27, 2015	/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 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 June 30, 2015 (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:	July 27, 2015	/s/ Ralph W. Babb, Jr.
		Ralph W. Babb, Jr.
		Chairman and
		Chief Executive Officer
		/s/ Karen L. Parkhill
		Karen L. Parkhill
		Vice Chairman and
		Chief Financial Officer

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Fair Value Measurements (Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value In Their Entirety On A Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Cash and due from banks		$ 1,148	$ 1,026
Interest-bearing deposits with banks		4,817	5,045
Investment securities held-to-maturity		1,952	1,935
Total loans, net of allowance for loan losses		49,123	47,999
Demand deposits (noninterest-bearing)		28,167	27,224
Customer certificates of deposit		4,367	4,421
Total deposits		58,260	57,486
Short-term borrowings		56	116
Medium- and long-term debt		2,841	2,675
Carrying Amount
Cash and due from banks		1,148	1,026
Interest-bearing deposits with banks		4,817	5,045
Investment securities held-to-maturity		1,952	1,935
Loans held-for-sale		25	5
Total loans, net of allowance for loan losses	[1]	49,123	47,999
Customers' liability on acceptances outstanding		8	10
Nonmarketable equity securities	[2]	11	11
Restricted equity investments		92	92
Demand deposits (noninterest-bearing)		28,167	27,224
Interest-bearing deposits		25,726	25,841
Customer certificates of deposit		4,367	4,421
Total deposits		58,260	57,486
Short-term borrowings		56	116
Acceptances outstanding		8	10
Medium- and long-term debt		2,841	2,675
Credit-related financial instruments		(95)	(85)
Estimated Fair Value
Cash and due from banks		1,148	1,026
Interest-bearing deposits with banks		4,817	5,045
Investment securities held-to-maturity		1,946	1,933
Loans held-for-sale		25	5
Total loans, net of allowance for loan losses	[1]	49,009	47,932
Customers' liability on acceptances outstanding		8	10
Nonmarketable equity securities	[2]	18	18
Restricted equity investments		92	92
Demand deposits (noninterest-bearing)		28,167	27,224
Interest-bearing deposits		25,726	25,841
Customer certificates of deposit		4,357	4,411
Total deposits		58,250	57,476
Short-term borrowings		56	116
Acceptances outstanding		8	10
Medium- and long-term debt		2,835	2,681
Credit-related financial instruments		(95)	(85)
Level 1 | Estimated Fair Value
Cash and due from banks		1,148	1,026
Interest-bearing deposits with banks		4,817	5,045
Investment securities held-to-maturity		0	0
Loans held-for-sale		0	0
Total loans, net of allowance for loan losses	[1]	0	0
Customers' liability on acceptances outstanding		8	10
Nonmarketable equity securities	[2]	0	0
Restricted equity investments		92	92
Demand deposits (noninterest-bearing)		0	0
Interest-bearing deposits		0	0
Customer certificates of deposit		0	0
Total deposits		0	0
Short-term borrowings		56	116
Acceptances outstanding		8	10
Medium- and long-term debt		0	0
Credit-related financial instruments		0	0
Level 2 | Estimated Fair Value
Cash and due from banks		0	0
Interest-bearing deposits with banks		0	0
Investment securities held-to-maturity		1,946	1,933
Loans held-for-sale		25	5
Total loans, net of allowance for loan losses	[1]	0	0
Customers' liability on acceptances outstanding		0	0
Nonmarketable equity securities	[2]	0	0
Restricted equity investments		0	0
Demand deposits (noninterest-bearing)		28,167	27,224
Interest-bearing deposits		25,726	25,841
Customer certificates of deposit		4,357	4,411
Total deposits		58,250	57,476
Short-term borrowings		0	0
Acceptances outstanding		0	0
Medium- and long-term debt		2,835	2,681
Credit-related financial instruments		0	0
Level 3 | Estimated Fair Value
Cash and due from banks		0	0
Interest-bearing deposits with banks		0	0
Investment securities held-to-maturity		0	0
Loans held-for-sale		0	0
Total loans, net of allowance for loan losses	[1]	49,009	47,932
Customers' liability on acceptances outstanding		0	0
Nonmarketable equity securities	[2]	18	18
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		(95)	(85)
Nonrecurring | Level 3
Nonmarketable equity securities		1	2
Nonrecurring | Level 3 | Estimated Fair Value
Total loans, net of allowance for loan losses		$ 38	$ 64

[1] Included $38 million and $64 million of impaired loans recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014, respectively.

[2] Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014, respectively.

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Credit Quality And Allowance For Credit Losses Credit Quality And Allowance For Credit Losses (Troubled Debt Restructuring Subsequent Default) (Details) - Principal Deferrals - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Modifications [Line Items]
Balance		$ 23	$ 48		$ 23	$ 48
Subsequent default during period		1	0		8	2
Business loans
Financing Receivable, Modifications [Line Items]
Balance		21	41		21	41
Subsequent default during period		1	0		8	2
Business loans | Commercial
Financing Receivable, Modifications [Line Items]
Balance		10	12		10	12
Subsequent default during period		0	0		6	2
Business loans | Commercial mortgage
Financing Receivable, Modifications [Line Items]
Balance		11	28		11	28
Subsequent default during period		1	0		2	0
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Modifications [Line Items]
Balance	[1]	1	17		1	17
Subsequent default during period	[1]	0	0		0	0
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Modifications [Line Items]
Balance	[2]	10	11		10	11
Subsequent default during period	[2]	1	0		2	0
Business loans | International
Financing Receivable, Modifications [Line Items]
Balance		0	1		0	1
Subsequent default during period		0	0		0	0
Retail loans
Financing Receivable, Modifications [Line Items]
Balance		2	7		2	7
Subsequent default during period		0	0		0	0
Retail loans | Residential mortgage
Financing Receivable, Modifications [Line Items]
Balance		0	2	[3]	0	2	[3]
Subsequent default during period		0	0		0	0
Retail loans | Consumer
Financing Receivable, Modifications [Line Items]
Balance		2	5		2	5
Subsequent default during period		0	0		0	0
Retail loans | Consumer | Home equity
Financing Receivable, Modifications [Line Items]
Balance	[3]	2	4		2	4
Subsequent default during period		0	0		0	0
Retail loans | Consumer | Other consumer
Financing Receivable, Modifications [Line Items]
Balance		0	1	[3]	0	1	[3]
Subsequent default during period		$ 0	$ 0		$ 0	$ 0

[1] Primarily loans to real estate developers.

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

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

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Credit Quality And Allowance For Credit Losses (Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Nonaccrual loans		$ 349	$ 273
Reduced-rate loans	[1]	12	17
Total nonperforming loans		361	290
Foreclosed property	[2]	9	10
Total nonperforming assets		370	300
Business loans
Nonaccrual loans		284	206
Reduced-rate loans		0	0
Retail loans
Nonaccrual loans		65	67
Reduced-rate loans		$ 12	$ 17

[1] Reduced-rate business loans were zero at both June 30, 2015 and December 31, 2014, and reduced-rate retail loans were $12 million and $17 million at June 30, 2015 and December 31, 2014, respectively.

[2] Foreclosed residential real estate properties.

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Employee Benefit Plans Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Net periodic defined benefit cost			$ 23	$ 19
Qualified Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 8	18	15
Interest cost	22	22	44	44
Expected return on plan assets	(40)	(33)	(80)	(66)
Amortization of prior service cost (credit)	1	2	2	3
Amortization of net loss	15	7	29	15
Net periodic defined benefit cost	7	6	13	11
Non-Qualified Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	3	3	5	5
Amortization of prior service cost (credit)	(1)	(1)	(2)	(2)
Amortization of net loss	2	1	5	3
Net periodic defined benefit cost	5	4	10	8
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	1	1	2
Expected return on plan assets	(1)	(1)	(2)	(2)
Amortization of net loss	1	0	1	0
Net periodic defined benefit cost	$ 0	$ 0	$ 0	$ 0

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Credit Quality And Allowance For Credit Losses (Acquired Purchased Credit-Impaired Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Credit Quality And Allowance For Credit Losses [Abstract]
Carrying amount PCI loans	$ 2	$ 2
Outstanding balance PCI loans	$ 6	$ 8

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Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		$ 107	$ 132
60-89 days past due and still accruing		14	31
90 days or more past due and still accruing		18	5
Total loans past due and still accruing		139	168
Nonaccrual loans		349	273
Current loans		49,253	48,152
Total loans		49,741	48,593
Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		68	106
60-89 days past due and still accruing		11	26
90 days or more past due and still accruing		17	4
Total loans past due and still accruing		96	136
Nonaccrual loans		284	206
Current loans		45,018	44,038
Total loans		45,398	44,380
Business loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		45	58
60-89 days past due and still accruing		3	13
90 days or more past due and still accruing		7	1
Total loans past due and still accruing		55	72
Nonaccrual loans		186	109
Current loans		32,482	31,339
Total loans		32,723	31,520
Business loans | Real estate construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		2	15
60-89 days past due and still accruing		0	0
90 days or more past due and still accruing		8	0
Total loans past due and still accruing		10	15
Nonaccrual loans		1	2
Current loans		1,784	1,938
Total loans		1,795	1,955
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	[1]	2	3
60-89 days past due and still accruing	[1]	0	0
90 days or more past due and still accruing	[1]	0	0
Total loans past due and still accruing	[1]	2	3
Nonaccrual loans	[1]	0	1
Current loans	[1]	1,500	1,602
Total loans	[1],[2]	1,502	1,606
Business loans | Real estate construction | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	[3]	0	12
60-89 days past due and still accruing	[3]	0	0
90 days or more past due and still accruing	[3]	8	0
Total loans past due and still accruing	[3]	8	12
Nonaccrual loans	[3]	1	1
Current loans	[3]	284	336
Total loans	[3],[4]	293	349
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		17	24
60-89 days past due and still accruing		5	13
90 days or more past due and still accruing		2	3
Total loans past due and still accruing		24	40
Nonaccrual loans		77	95
Current loans		8,573	8,469
Total loans		8,674	8,604
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	[1]	3	8
60-89 days past due and still accruing	[1]	0	1
90 days or more past due and still accruing	[1]	0	1
Total loans past due and still accruing	[1]	3	10
Nonaccrual loans	[1]	18	22
Current loans	[1]	1,907	1,758
Total loans	[1],[2]	1,928	1,790
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	[3]	14	16
60-89 days past due and still accruing	[3]	5	12
90 days or more past due and still accruing	[3]	2	2
Total loans past due and still accruing	[3]	21	30
Nonaccrual loans	[3]	59	73
Current loans	[3]	6,666	6,711
Total loans	[3],[4]	6,746	6,814
Business loans | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		0	0
60-89 days past due and still accruing		0	0
90 days or more past due and still accruing		0	0
Total loans past due and still accruing		0	0
Nonaccrual loans		11	0
Current loans		775	805
Total loans		786	805
Business loans | International
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	0
90 days or more past due and still accruing		0	0
Total loans past due and still accruing		7	9
Nonaccrual loans		9	0
Current loans		1,404	1,487
Total loans		1,420	1,496
Retail loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		39	26
60-89 days past due and still accruing		3	5
90 days or more past due and still accruing		1	1
Total loans past due and still accruing		43	32
Nonaccrual loans		65	67
Current loans		4,235	4,114
Total loans		4,343	4,213
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		33	9
60-89 days past due and still accruing		1	2
90 days or more past due and still accruing		0	0
Total loans past due and still accruing		34	11
Nonaccrual loans		35	36
Current loans		1,796	1,784
Total loans		1,865	1,831
Retail loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		6	17
60-89 days past due and still accruing		2	3
90 days or more past due and still accruing		1	1
Total loans past due and still accruing		9	21
Nonaccrual loans		30	31
Current loans		2,439	2,330
Total loans		2,478	2,382
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		4	5
60-89 days past due and still accruing		2	3
90 days or more past due and still accruing		1	0
Total loans past due and still accruing		7	8
Nonaccrual loans		29	30
Current loans		1,646	1,620
Total loans		1,682	1,658
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing		2	12
60-89 days past due and still accruing		0	0
90 days or more past due and still accruing		0	1
Total loans past due and still accruing		2	13
Nonaccrual loans		1	1
Current loans		793	710
Total loans		$ 796	$ 724

[1] Primarily loans to real estate developers.

[2] Primarily loans to real estate developers.

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

[4] 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	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Increase In Card Fees Due To Presentation Change	$ 44	$ 88
Increase In Processing Fee Expense Due to Presentation Change	44	88
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in Other Assets Due to Adoption of New Accounting Pronouncement	(3,978)	(3,978)	$ (4,434)
Decrease in Long-term Debt Due to Adoption of New Accounting Pronouncement	(2,841)	(2,841)	(2,675)
Unamortized Debt Issuance Costs	$ 6	$ 6
Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in Other Assets Due to Adoption of New Accounting Pronouncement			4
Decrease in Long-term Debt Due to Adoption of New Accounting Pronouncement			$ 4

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Business Segment Information (Narrative) (Details) - 6 months ended Jun. 30, 2015	segments markets
Segment Reporting [Abstract]
Number of Major Business Segments | segments	3
Number of Primary Market Segments	3

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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair value of securities pledged as collateral for derivative assets	$ 128		$ 128
Cash received as collateral for derivative assets	254		254
Cash posted as collateral for derivative liabilities	3		3
Aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	0		0
Net interest income generated by risk management fair value interest rate swaps	16	$ 18	34	$ 36
Net gain (loss) on interest rate fair value hedge ineffectiveness	$ (2)		$ (1)
Interest rate fair value hedge ineffectiveness		an insignificant amount		an insignificant amount
Net gain (loss) on economic hedges	an insignificant amount	an insignificant amount	an insignificant amount	an insignificant amount
Net gain on foreign currency positions	$ 1		$ 1
Allowance for credit losses on lending-related commitments	50		50		$ 41
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit	33		33		30
Risk participation agreements covering standby and commercial letters of credit	292		292		316
Standby and commercial letters of credit	3,800		3,800		4,000
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities	61		61		55
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities	44		44		44
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit	17		17		11
Notional amount of derivative credit risk participation agreements	620		620		598
Maximum estimated exposure to credit risk participation agreements assuming 100% default	8		$ 8		7
Weighted average remaining maturity of credit risk participation agreements, in years			2 years 6 months 11 days
Fair value of derivative liability	$ 469		$ 469		661
Visa derivative contract
Notional amount of the derivative contract equivalent to Visa Class B shares	780		780
Fair value of derivative liability	$ 1		$ 1		$ 1

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Subsequent Events (Narrative) (Details) - Subsidiaries - USD ($) $ in Millions		Jul. 22, 2015	Jun. 30, 2015
4.00% Subordinated Notes Due 2025 | Debt Issuance
Subsequent Event [Line Items]
Notes issued		$ 350
Stated interest rate		4.00%
2.50% Senior Notes Due 2020
Subsequent Event [Line Items]
Notes issued	[1]		$ 500
Stated interest rate	[1]		2.50%
2.50% Senior Notes Due 2020 | Debt Issuance
Subsequent Event [Line Items]
Notes issued		$ 175
Stated interest rate		2.50%

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

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Income Taxes And Tax-Related Items Income Taxes And Tax-Related Items (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 22	$ 14
Reasonably possible decrease in unrecognized tax benefits in next 12 months	8
Tax-related interest and penalties payable	3	2
Net deferred tax assets	135	130
Valuation allowance for deferred tax assets	$ 0	$ 0

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Credit Quality And Allowance For Credit Losses (Tables)

6 Months Ended

Jun. 30, 2015

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		Total  Loans
June 30, 2015
Business loans:
Commercial	$	45	$	3	$	7	$	55	$	186	$	32,482	$	32,723
Real estate construction:
Commercial Real Estate business line (a)	2		—		—		2		—		1,500		1,502
Other business lines (b)	—		—		8		8		1		284		293
Total real estate construction	2		—		8		10		1		1,784		1,795
Commercial mortgage:
Commercial Real Estate business line (a)	3		—		—		3		18		1,907		1,928
Other business lines (b)	14		5		2		21		59		6,666		6,746
Total commercial mortgage	17		5		2		24		77		8,573		8,674
Lease financing	—		—		—		—		11		775		786
International	4		3		—		7		9		1,404		1,420
Total business loans	68		11		17		96		284		45,018		45,398
Retail loans:
Residential mortgage	33		1		—		34		35		1,796		1,865
Consumer:
Home equity	4		2		1		7		29		1,646		1,682
Other consumer	2		—		—		2		1		793		796
Total consumer	6		2		1		9		30		2,439		2,478
Total retail loans	39		3		1		43		65		4,235		4,343
Total loans	$	107	$	14	$	18	$	139	$	349	$	49,253	$	49,741
December 31, 2014
Business loans:
Commercial	$	58	$	13	$	1	$	72	$	109	$	31,339	$	31,520
Real estate construction:
Commercial Real Estate business line (a)	3		—		—		3		1		1,602		1,606
Other business lines (b)	12		—		—		12		1		336		349
Total real estate construction	15		—		—		15		2		1,938		1,955
Commercial mortgage:
Commercial Real Estate business line (a)	8		1		1		10		22		1,758		1,790
Other business lines (b)	16		12		2		30		73		6,711		6,814
Total commercial mortgage	24		13		3		40		95		8,469		8,604
Lease financing	—		—		—		—		—		805		805
International	9		—		—		9		—		1,487		1,496
Total business loans	106		26		4		136		206		44,038		44,380
Retail loans:
Residential mortgage	9		2		—		11		36		1,784		1,831
Consumer:
Home equity	5		3		—		8		30		1,620		1,658
Other consumer	12		—		1		13		1		710		724
Total consumer	17		3		1		21		31		2,330		2,382
Total retail loans	26		5		1		32		67		4,114		4,213
Total loans	$	132	$	31	$	5	$	168	$	273	$	48,152	$	48,593

(a) Primarily loans to real estate developers.

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

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
June 30, 2015
Business loans:
Commercial	$	31,046	$	710	$	781	$	186	$	32,723
Real estate construction:
Commercial Real Estate business line (e)	1,490		12		—		—		1,502
Other business lines (f)	284		—		8		1		293
Total real estate construction	1,774		12		8		1		1,795
Commercial mortgage:
Commercial Real Estate business line (e)	1,818		59		33		18		1,928
Other business lines (f)	6,385		170		132		59		6,746
Total commercial mortgage	8,203		229		165		77		8,674
Lease financing	752		17		6		11		786
International	1,362		24		25		9		1,420
Total business loans	43,137		992		985		284		45,398
Retail loans:
Residential mortgage	1,815		2		13		35		1,865
Consumer:
Home equity	1,647		1		5		29		1,682
Other consumer	781		3		11		1		796
Total consumer	2,428		4		16		30		2,478
Total retail loans	4,243		6		29		65		4,343
Total loans	$	47,380	$	998	$	1,014	$	349	$	49,741
December 31, 2014
Business loans:
Commercial	$	30,310	$	560	$	541	$	109	$	31,520
Real estate construction:
Commercial Real Estate business line (e)	1,594		11		—		1		1,606
Other business lines (f)	336		7		5		1		349
Total real estate construction	1,930		18		5		2		1,955
Commercial mortgage:
Commercial Real Estate business line (e)	1,652		69		47		22		1,790
Other business lines (f)	6,434		138		169		73		6,814
Total commercial mortgage	8,086		207		216		95		8,604
Lease financing	778		26		1		—		805
International	1,468		15		13		—		1,496
Total business loans	42,572		826		776		206		44,380
Retail loans:
Residential mortgage	1,790		2		3		36		1,831
Consumer:
Home equity	1,620		—		8		30		1,658
Other consumer	718		3		2		1		724
Total consumer	2,338		3		10		31		2,382
Total retail loans	4,128		5		13		67		4,213
Total loans	$	46,700	$	831	$	789	$	273	$	48,593

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

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

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

(d) Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-55 in the Corporation's 2014 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.

(e) Primarily loans to real estate developers.

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

Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property

The following table summarizes nonperforming assets.

(in millions)	June 30, 2015		December 31, 2014
Nonaccrual loans	$	349	$	273
Reduced-rate loans (a)	12		17
Total nonperforming loans	361		290
Foreclosed property (b)	9		10
Total nonperforming assets	$	370	$	300

(a) Reduced-rate business loans were zero at both June 30, 2015 and December 31, 2014, and reduced-rate retail loans were $12 million and $17 million at June 30, 2015 and December 31, 2014, respectively.

(b) Foreclosed residential real estate properties.

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.

	2015									2014
(in millions)	Business Loans			Retail Loans			Total			Business Loans			Retail Loans			Total
Three Months Ended June 30
Allowance for loan losses:
Balance at beginning of period	$	541		$	60		$	601		$	530		$	64		$	594
Loan charge-offs	(31		)	(4		)	(35		)	(24		)	(4		)	(28		)
Recoveries on loans previously charged-off	16			1			17			15			4			19
Net loan charge-offs	(15		)	(3		)	(18		)	(9		)	—			(9		)
Provision for loan losses	37			(2		)	35			7			(1		)	6
Balance at end of period	$	563		$	55		$	618		$	528		$	63		$	591
Six Months Ended June 30
Allowance for loan losses:
Balance at beginning of period	$	534		$	60		$	594		$	531		$	67		$	598
Loan charge-offs	(52		)	(6		)	(58		)	(51		)	(7		)	(58		)
Recoveries on loans previously charged-off	28			4			32			31			6			37
Net loan charge-offs	(24		)	(2		)	(26		)	(20		)	(1		)	(21		)
Provision for loan losses	54			(3		)	51			17			(3		)	14
Foreign currency translation adjustment	(1		)	—			(1		)	—			—			—
Balance at end of period	$	563		$	55		$	618		$	528		$	63		$	591
As a percentage of total loans	1.24		%	1.27		%	1.24		%	1.21		%	1.55		%	1.23		%
June 30
Allowance for loan losses:
Individually evaluated for impairment	$	39		$	—		$	39		$	39		$	—		$	39
Collectively evaluated for impairment	524			55			579			489			63			552
Total allowance for loan losses	$	563		$	55		$	618		$	528		$	63		$	591
Loans:
Individually evaluated for impairment	$	258		$	34		$	292		$	215		$	45		$	260
Collectively evaluated for impairment	45,140			4,307			49,447			43,631			3,988			47,619
Purchased credit impaired (PCI) loans	—			2			2			—			3			3
Total loans evaluated for impairment	$	45,398		$	4,343		$	49,741		$	43,846		$	4,036		$	47,882

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 June 30,					Six Months Ended June 30,
(in millions)	2015			2014		2015			2014
Balance at beginning of period	$	39		$	37	$	41		$	36
Charge-offs on lending related commitments (a)	(1		)	—		(1		)	—
Provision for credit losses on lending-related commitments	12			5		10			6
Balance at end of period	$	50		$	42	$	50		$	42

(a)    Charge-offs result from the sale of unfunded lending-related commitments.

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
June 30, 2015
Business loans:
Commercial	$	27	$	168	$	195	$	239	$	30
Real estate construction:
Other business lines (a)	—		1		1		1		—
Commercial mortgage:
Commercial Real Estate business line (b)	7		8		15		37		6
Other business lines (a)	2		36		38		55		1
Total commercial mortgage	9		44		53		92		7
International	—		9		9		16		2
Total business loans	36		222		258		348		39
Retail loans:
Residential mortgage	15		—		15		17		—
Consumer:
Home equity	12		—		12		15		—
Other consumer	7		—		7		11		—
Total consumer	19		—		19		26		—
Total retail loans (c)	34		—		34		43		—
Total individually evaluated impaired loans	$	70	$	222	$	292	$	391	$	39
December 31, 2014
Business loans:
Commercial	$	7	$	103	$	110	$	148	$	29
Real estate construction:
Other business lines (a)	—		1		1		1		—
Commercial mortgage:
Commercial Real Estate business line (b)	—		19		19		41		8
Other business lines (a)	4		43		47		63		2
Total commercial mortgage	4		62		66		104		10
Total business loans	11		166		177		253		39
Retail loans:
Residential mortgage	25		—		25		28		—
Consumer:
Home equity	12		—		12		16		—
Other consumer	5		—		5		7		—
Total consumer	17		—		17		23		—
Total retail loans (c)	42		—		42		51		—
Total individually evaluated impaired loans	$	53	$	166	$	219	$	304	$	39

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

(b) Primarily loans to real estate developers.

(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 performing restructured loans.

	Individually Evaluated Impaired Loans
	2015				2014
(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 June 30
Business loans:
Commercial	$	152	$	1	$	56	$	—
Real estate construction:
Commercial Real Estate business line (a)	—		—		17		—
Commercial mortgage:
Commercial Real Estate business line (a)	16		—		63		—
Other business lines (b)	40		—		71		1
Total commercial mortgage	56		—		134		1
International	5		—		2		—
Total business loans	213		1		209		1
Retail loans:
Residential mortgage	19		—		31		—
Consumer loans:
Home equity	12		—		12		—
Other consumer	5		—		4		—
Total consumer	17		—		16		—
Total retail loans	36		—		47		—
Total individually evaluated impaired loans	$	249	$	1	$	256	$	1
Six Months Ended June 30
Business loans:
Commercial	$	138	$	2	$	62	$	—
Real estate construction:
Commercial Real Estate business line (a)	—		—		18		—
Commercial mortgage:
Commercial Real Estate business line (a)	17		—		62		—
Other business lines (b)	42		—		70		2
Total commercial mortgage	59		—		132		2
International	3		—		2		—
Total business loans	200		2		214		2
Retail loans:
Residential mortgage	21		—		32		—
Consumer:
Home equity	12		—		12		—
Other consumer	5		—		4		—
Total consumer	17		—		16		—
Total retail loans	38		—		48		—
Total individually evaluated impaired loans	$	238	$	2	$	262	$	2

(a) Primarily loans to real estate developers.

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

Troubled Debt Restructurings By Type Of Modification

The following tables detail the recorded balance at June 30, 2015 and 2014 of loans considered to be TDRs that were restructured during the three- and six-month periods ended June 30, 2015 and 2014, 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.

	2015						2014
	Type of Modification						Type of Modification
(in millions)	Principal Deferrals (a)		Interest Rate Reductions		Total Modifications		Principal Deferrals (a)		Interest Rate Reductions		Total Modifications
Three Months Ended June 30
Business loans:
Commercial	$	2	$	—	$	2	$	—	$	—	$	—
Commercial mortgage:
Commercial Real Estate business line (b)	1		—		1		—		—		—
Other business lines (c)	1		—		1		—		—		—
Total commercial mortgage	2		—		2		—		—		—
Total business loans	4		—		4		—		—		—
Retail loans:
Consumer:
Home equity	—		1		1		—		1		1
Total loans	$	4	$	1	$	5	$	—	$	1	$	1
Six Months Ended June 30
Business loans:
Commercial	$	2	$	—	$	2	$	1	$	—	$	1
Commercial mortgage:
Commercial Real Estate business line (b)	1		—		1		—		—		—
Other business lines (c)	4		—		4		8		—		8
Total commercial mortgage	5		—		5		8		—		8
International	—		—		—		1		—		1
Total business loans	7		—		7		10		—		10
Retail loans:
Consumer:
Home equity	—		1		1		—		2		2
Total loans	$	7	$	1	$	8	$	10	$	2	$	12

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

(b) Primarily loans to real estate developers.

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

Troubled Debt Restructuring Subsequent Default

The following table presents information regarding the recorded balance at June 30, 2015 and 2014 of loans modified by principal deferral during the twelve-month periods ended June 30, 2015 and 2014, and those principal deferrals which experienced a subsequent default during the three- and six-month periods ended June 30, 2015 and 2014. 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.

	2015							2014
(in millions)	Balance at June 30			Subsequent Default in the Three Months Ended June 30		Subsequent Default in the Six Months Ended June 30		Balance at June 30			Subsequent Default in the Three Months Ended June 30		Subsequent Default in the Six Months Ended June 30
Principal deferrals:
Business loans:
Commercial	$	10		$	—	$	6	$	12		$	—	$	2
Commercial mortgage:
Commercial Real Estate business line (a)	1			—		—		17			—		—
Other business lines (b)	10			1		2		11			—		—
Total commercial mortgage	11			1		2		28			—		—
International	—			—		—		1			—		—
Total business loans	21			1		8		41			—		2
Retail loans:
Residential mortgage	—			—		—		2		(c)	—		—
Consumer:
Home equity	2		(c)	—		—		4		(c)	—		—
Other consumer	—			—		—		1		(c)	—		—
Total consumer	2			—		—		5			—		—
Total retail loans	2			—		—		7			—		—
Total principal deferrals	$	23		$	1	$	8	$	48		$	—	$	2

(a) Primarily loans to real estate developers.

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

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

Acquired Purchased Credit-Impaired Loans

The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at June 30, 2015 and December 31, 2014 were as follows.

(in millions)	June 30, 2015		December 31, 2014
Acquired PCI loans:
Carrying amount	$	2	$	2
Outstanding balance (principal and unpaid interest)	6		8

Accretable Yield For Acquired Purchased Credit-Impaired Loans

Changes in the accretable yield for acquired PCI loans for the three- and six-month periods ended June 30, 2015 and 2014 were as follows.

	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)	2015		2014			2015			2014
Balance at beginning of period	$	1	$	11		$	1		$	15
Reclassifications from nonaccretable	—		4			1			9
Accretion	—		(9		)	(1		)	(18		)
Balance at end of period	$	1	$	6		$	1		$	6

XML

Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Credit Losses On Lending-Related Commitments) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses		$ 47	$ 11	$ 61	$ 20
Lending-related commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		39	37	41	36
Charge-offs on lending related commitments	[1]	(1)	0	(1)	0
Provision for credit losses		12	5	10	6
Balance at end of period		$ 50	$ 42	$ 50	$ 42

[1] Charge-offs result from the sale of unfunded lending-related commitments.

XML

Investment Securities (Summary Of Investment Securities Available-For-Sale In Unrealized Loss Positions) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Temporarily Impaired Less than 12 months, Fair Value		$ 1,849	$ 924
Temporarily Impaired 12 months or more, Fair Value		2,212	3,247
Temporarily Impaired Total, Fair Value		4,061	4,171
Temporarily Impaired Less than 12 Months, Unrealized Losses		16	3
Temporarily Impaired 12 Months or more, Unrealized Losses		60	73
Temporarily Impaired Total, Unrealized Losses		76	76
U.S. Treasury and Other U.S. Government Agency Securities
Temporarily Impaired Less than 12 months, Fair Value		212	298
Temporarily Impaired 12 months or more, Fair Value		0	0
Temporarily Impaired Total, Fair Value		212	298
Temporarily Impaired Less than 12 Months, Unrealized Losses		1	0	[1]
Temporarily Impaired 12 Months or more, Unrealized Losses		0	0
Temporarily Impaired Total, Unrealized Losses		1	0	[1]
Residential Mortgage-Backed Securities
Temporarily Impaired, Less than 12 Months, Fair Value	[2]	1,637	626
Temporarily Impaired, 12 Months or more, Fair Value	[2]	2,188	3,112
Temporarily Impaired Total, Fair Value	[2]	3,825	3,738
Temporarily Impaired, Less than 12 Months, Unrealized Losses	[2]	15	3
Temporarily Impaired, 12 Months or more, Unrealized Losses	[2]	59	71
Temporarily Impaired Total, Unrealized Losses	[2]	74	74
State And Municipal Securities
Temporarily Impaired Less than 12 months, Fair Value	[3]	0	0
Temporarily Impaired 12 months or more, Fair Value	[3]	23	22
Temporarily Impaired Total, Fair Value	[3]	23	22
Temporarily Impaired Less than 12 Months, Unrealized Losses	[3]	0	0
Temporarily Impaired 12 Months or more, Unrealized Losses	[3]	1	1
Temporarily Impaired Total, Unrealized Losses	[3]	1	1
Corporate Debt Securities
Temporarily Impaired Less than 12 months, Fair Value	[3]	0	0
Temporarily Impaired 12 months or more, Fair Value	[3]	1	1
Temporarily Impaired Total, Fair Value	[3]	1	1
Temporarily Impaired Less than 12 Months, Unrealized Losses	[3]	0	0
Temporarily Impaired 12 Months or more, Unrealized Losses	[1],[3]	0	0
Temporarily Impaired Total, Unrealized Losses	[1],[3]	$ 0	0
Equity and Other Non-Debt Securities
Temporarily Impaired Less than 12 months, Fair Value	[3]		0
Temporarily Impaired 12 months or more, Fair Value	[3]		112
Temporarily Impaired Total, Fair Value	[3]		112
Temporarily Impaired Less than 12 Months, Unrealized Losses	[3]		0
Temporarily Impaired 12 Months or more, Unrealized Losses	[3]		1
Temporarily Impaired Total, Unrealized Losses	[3]		$ 1

[1] Unrealized losses less than $0.5 million.

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

[3] Auction-rate securities.

XML

Business Segment Information (Market Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net interest income (expense) (FTE)		$ 422	$ 417	$ 836	$ 828
Provision for credit losses		47	11	61	20
Noninterest income		261	220	516	428
Noninterest expenses		436	404	895	810
Provision (benefit) for income taxes (FTE)		65	71	127	136
Net income (loss)		135	151	269	290
Net credit-related charge-offs (recoveries)		18	9	26	21
Assets, average		68,963	64,878	68,852	64,794
Loans, average		48,833	46,725	48,494	45,905
Deposits, average		$ 57,398	$ 53,384	$ 57,196	$ 53,079
Return on average assets	[1],[2]	0.79%	0.93%	0.78%	0.90%
Efficiency ratio	[3],[4]	63.68%	63.35%	66.07%	64.55%
Michigan
Net interest income (expense) (FTE)		$ 179	$ 182	$ 357	$ 364
Provision for credit losses		(13)	(9)	(21)	(5)
Noninterest income		85	89	166	173
Noninterest expenses		128	159	283	320
Provision (benefit) for income taxes (FTE)		51	44	89	80
Net income (loss)		98	77	172	142
Net credit-related charge-offs (recoveries)		(2)	10	1	10
Assets, average		13,852	13,851	13,794	13,835
Loans, average		13,290	13,482	13,257	13,478
Deposits, average		$ 21,706	$ 20,694	$ 21,709	$ 20,668
Return on average assets	[1]	1.73%	1.42%	1.52%	1.32%
Efficiency ratio	[3]	48.21%	58.67%	54.14%	59.56%
California
Net interest income (expense) (FTE)		$ 181	$ 176	$ 357	$ 349
Provision for credit losses		4	14	1	25
Noninterest income		37	38	74	73
Noninterest expenses		100	100	199	197
Provision (benefit) for income taxes (FTE)		43	37	87	74
Net income (loss)		71	63	144	126
Net credit-related charge-offs (recoveries)		6	5	6	15
Assets, average		16,696	15,721	16,580	15,429
Loans, average		16,429	15,439	16,312	15,133
Deposits, average		$ 17,275	$ 15,370	$ 17,057	$ 15,078
Return on average assets	[1]	1.54%	1.54%	1.59%	1.57%
Efficiency ratio	[3]	46.04%	46.64%	46.20%	46.62%
Texas
Net interest income (expense) (FTE)		$ 130	$ 137	$ 260	$ 273
Provision for credit losses		43	22	64	29
Noninterest income		31	35	67	69
Noninterest expenses		94	89	189	179
Provision (benefit) for income taxes (FTE)		10	22	28	48
Net income (loss)		14	39	46	86
Net credit-related charge-offs (recoveries)		5	2	8	8
Assets, average		11,878	11,661	12,034	11,367
Loans, average		11,254	10,966	11,394	10,667
Deposits, average		$ 10,959	$ 10,724	$ 10,985	$ 10,799
Return on average assets	[1]	0.46%	1.30%	0.74%	1.43%
Efficiency ratio	[3]	58.20%	51.67%	57.81%	52.30%
Other Markets
Net interest income (expense) (FTE)		$ 85	$ 76	$ 165	$ 148
Provision for credit losses		10	(8)	16	(20)
Noninterest income		93	41	181	80
Noninterest expenses		110	45	213	93
Provision (benefit) for income taxes (FTE)		15	21	31	39
Net income (loss)		43	59	86	116
Net credit-related charge-offs (recoveries)		9	(8)	11	(12)
Assets, average		8,321	7,281	7,993	7,074
Loans, average		7,860	6,838	7,531	6,627
Deposits, average		$ 7,096	$ 6,069	$ 7,041	$ 5,986
Return on average assets	[1]	2.05%	3.28%	2.15%	3.28%
Efficiency ratio	[3]	61.45%	38.73%	61.01%	40.99%
Finance & Other
Net interest income (expense) (FTE)		$ (153)	$ (154)	$ (303)	$ (306)
Provision for credit losses		3	(8)	1	(9)
Noninterest income		15	17	28	33
Noninterest expenses		4	11	11	21
Provision (benefit) for income taxes (FTE)		(54)	(53)	(108)	(105)
Net income (loss)		(91)	(87)	(179)	(180)
Net credit-related charge-offs (recoveries)		0	0	0	0
Assets, average		18,216	16,364	18,451	17,089
Loans, average		0	0	0	0
Deposits, average		$ 362	$ 527	$ 404	$ 548

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

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

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

[4] 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 - Level 3 - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 38	$ 64
Nonmarketable equity securities	1	2
Other real estate	4	2
Total assets at fair value	43	68
Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	18	38
Commercial mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	12	$ 26
International
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 8

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Credit Quality And Allowance For Credit Losses (Average Individually Evaluated Impaired Loans And Related Interest Recognized) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		$ 249	$ 256	$ 238	$ 262
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		1	1	2	2
Business loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		213	209	200	214
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		1	1	2	2
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		152	56	138	62
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		1	0	2	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	[1]	0	17	0	18
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[1]	0	0	0	0
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		56	134	59	132
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	1	0	2
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	[1]	16	63	17	62
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[1]	0	0	0	0
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	[2]	40	71	42	70
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[2]	0	1	0	2
Business loans | International
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		5	2	3	2
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		36	47	38	48
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		19	31	21	32
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		17	16	17	16
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		12	12	12	12
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans | Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		5	4	5	4
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		$ 0	$ 0	$ 0	$ 0

[1] Primarily loans to real estate developers.

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

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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Investment securities, Balance at beginning of period, net of tax	$ 37	$ (68)
Investment securities, Net unrealized holding (losses) gains arising during the period	(17)	116
Investment securities, (Benefit) Provision for income taxes	(6)	41
Investment securities, Net unrealized holding (losses) gains arising during period, net of tax	(11)	75
Investment securities, Net realized (losses) gains included in net securities (losses) gains	(2)	1
Investment securities, Benefit for income taxes	(1)	0
Investment securities, Reclassification adjustment for net securities (losses) gains included in net income, net of tax	(1)	1
Investment securities, Net losses realized as a yield adjustment in interest on investment securities	(4)	0
Investment securities, Benefit for income taxes	(1)	0
Investment Securities, Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax	(3)	0
Investment securities, Change in net unrealized (losses) gains on investment securities available-for-sale, net of tax	(7)	74
Investment securities, Balance at end of period, net of tax	30	6
Benefit plans, Balance at beginning of period, net of tax	(449)	(323)
Amortization of actuarial net loss recognized in salaries and benefits expense	35	18
Amortization of prior service cost	0	1
Benefit plans, Amounts recognized in salaries and benefits expense	35	19
Benefit plans, Provision for income taxes	12	6
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax	23	13
Benefit plans, Balance at end of period, net of tax	(426)	(310)
Total accumulated other comprehensive loss at end of period, net of tax	$ (396)	$ (304)	$ (412)

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Derivative And Credit-Related Financial Instruments (Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	$ 29,000	$ 30,056
Commercial And Other | Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	26,709	27,905
Bankcard, Revolving Check Credit And Home Equity Loan Commitments | Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	2,291	2,151
Standby Letters Of Credit
Loss contingency, range of possible loss, maximum	3,765	3,880
Commercial Letters Of Credit
Loss contingency, range of possible loss, maximum	80	75
Other Credit-Related Financial Instruments
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		Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total loans		$ 49,741	$ 48,593
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	47,380	46,700
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	998	831
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	1,014	789
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	349	273
Business loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		45,398	44,380
Business loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	43,137	42,572
Business loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	992	826
Business loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	985	776
Business loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	284	206
Business loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans		32,723	31,520
Business loans | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	31,046	30,310
Business loans | Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	710	560
Business loans | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	781	541
Business loans | Commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	186	109
Business loans | Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,795	1,955
Business loans | Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,774	1,930
Business loans | Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	12	18
Business loans | Real estate construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	8	5
Business loans | Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	1	2
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	[5],[6]	1,502	1,606
Business loans | Real estate construction | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[6]	1,490	1,594
Business loans | Real estate construction | Commercial Real Estate business line | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[6]	12	11
Business loans | Real estate construction | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[6]	0	0
Business loans | Real estate construction | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[6]	0	1
Business loans | Real estate construction | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	[7],[8]	293	349
Business loans | Real estate construction | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[8]	284	336
Business loans | Real estate construction | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[8]	0	7
Business loans | Real estate construction | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[8]	8	5
Business loans | Real estate construction | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[8]	1	1
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans		8,674	8,604
Business loans | Commercial mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	8,203	8,086
Business loans | Commercial mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	229	207
Business loans | Commercial mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	165	216
Business loans | Commercial mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	77	95
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	[5],[6]	1,928	1,790
Business loans | Commercial mortgage | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[6]	1,818	1,652
Business loans | Commercial mortgage | Commercial Real Estate business line | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[6]	59	69
Business loans | Commercial mortgage | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[6]	33	47
Business loans | Commercial mortgage | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[6]	18	22
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	[7],[8]	6,746	6,814
Business loans | Commercial mortgage | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[8]	6,385	6,434
Business loans | Commercial mortgage | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[8]	170	138
Business loans | Commercial mortgage | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[8]	132	169
Business loans | Commercial mortgage | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[8]	59	73
Business loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans		786	805
Business loans | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	752	778
Business loans | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	17	26
Business loans | Lease financing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	6	1
Business loans | Lease financing | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	11	0
Business loans | International
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,420	1,496
Business loans | International | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,362	1,468
Business loans | International | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	24	15
Business loans | International | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	25	13
Business loans | International | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	9	0
Retail loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		4,343	4,213
Retail loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	4,243	4,128
Retail loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	6	5
Retail loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	29	13
Retail loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	65	67
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,865	1,831
Retail loans | Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,815	1,790
Retail loans | Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	2	2
Retail loans | Residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	13	3
Retail loans | Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	35	36
Retail loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans		2,478	2,382
Retail loans | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	2,428	2,338
Retail loans | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	4	3
Retail loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	16	10
Retail loans | Consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	30	31
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,682	1,658
Retail loans | Consumer | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,647	1,620
Retail loans | Consumer | Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1	0
Retail loans | Consumer | Home equity | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	5	8
Retail loans | Consumer | Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	29	30
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans		796	724
Retail loans | Consumer | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	781	718
Retail loans | Consumer | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	3	3
Retail loans | Consumer | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	11	2
Retail loans | Consumer | Other consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	$ 1	$ 1

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

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

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

[4] Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-55 in the Corporation's 2014 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.

[5] Primarily loans to real estate developers.

[6] Primarily loans to real estate developers.

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

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

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Fair Value Measurements

6 Months Ended

Jun. 30, 2015

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.

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.

Refer to Note 1 to the consolidated financial statements in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2014 for further information about the fair value hierarchy, 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. When credit valuation adjustments are significant to the overall fair value of a derivative, the Corporation classifies the over-the-counter derivative valuation in Level 3 of the fair value hierarchy; otherwise, over-the-counter derivative valuations are classified in Level 2.

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 June 30, 2015 and December 31, 2014.

(in millions)	Total		Level 1		Level 2		Level 3
June 30, 2015
Trading securities:
Deferred compensation plan assets	$	94	$	94	$	—	$	—
Equity and other non-debt securities	1		1		—		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	732		732		—		—
Residential mortgage-backed securities (a)	7,262		—		7,262		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	47		—		46		1		(b)
Equity and other non-debt securities	203		132		—		71		(b)
Total investment securities available-for-sale	8,267		864		7,308		95
Derivative assets:
Interest rate contracts	284		—		282		2
Energy derivative contracts	349		—		349		—
Foreign exchange contracts	36		—		36		—
Warrants	3		—		—		3
Total derivative assets	672		—		667		5
Total assets at fair value	$	9,034	$	959	$	7,975	$	100
Derivative liabilities:
Interest rate contracts	$	90	$	—	$	90	$	—
Energy derivative contracts	348		—		348		—
Foreign exchange contracts	31		—		31		—
Other	1		—		—		1
Total derivative liabilities	470		—		469		1
Deferred compensation plan liabilities	94		94		—		—
Total liabilities at fair value	$	564	$	94	$	469	$	1

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

(b) Auction-rate securities.

(in millions)	Total		Level 1		Level 2		Level 3
December 31, 2014
Trading securities:
Deferred compensation plan assets	$	94	$	94	$	—	$	—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	526		526		—		—
Residential mortgage-backed securities (a)	7,274		—		7,274		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	51		—		50		1		(b)
Equity and other non-debt securities	242		130		—		112		(b)
Total investment securities available-for-sale	8,116		656		7,324		136
Derivative assets:
Interest rate contracts	328		—		328		—
Energy derivative contracts	527		—		527		—
Foreign exchange contracts	39		—		39		—
Warrants	4		—		—		4
Total derivative assets	898		—		894		4
Total assets at fair value	$	9,108	$	750	$	8,218	$	140
Derivative liabilities:
Interest rate contracts	$	102	$	—	$	102	$	—
Energy derivative contracts	525		—		525		—
Foreign exchange contracts	34		—		34		—
Other	1		—		—		1
Total derivative liabilities	662		—		661		1
Deferred compensation plan liabilities	94		94		—		—
Total liabilities at fair value	$	756	$	94	$	661	$	1

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

(b) Auction-rate securities.

There were no transfers of assets or liabilities recorded at fair value on a recurring basis into or out of Level 1, Level 2 and Level 3 fair value measurements during each of the three- and six-month periods ended June 30, 2015 and 2014.

The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three- and six-month periods ended June 30, 2015 and 2014.

			Net Realized/Unrealized Gains (Losses) (Pretax)
	Balance  at Beginning of Period		Recorded in Earnings								Recorded in Other Comprehensive Income						Balance  at End of  Period
(in millions)			Realized				Unrealized							Sales
Three Months Ended June 30, 2015
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	71		—				—				—			—			71
Total investment securities available-for-sale	95		—				—				—			—			95
Derivative assets:
Interest rate contracts	11		—				(9		)	(d)	—			—			2
Warrants	3		1			(d)	—				—			(1		)	3
Derivative liabilities:
Other	1		—				—				—			—			1
Three Months Ended June 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	118		—				—				1		(b)	(1		)	118
Total investment securities available-for-sale	142		—				—				1		(b)	(1		)	142
Derivative assets:
Warrants	3		4			(d)	—				—			(3		)	4
Derivative liabilities:
Other	2		—				—				—			—			2
Six Months Ended June 30, 2015
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	112		(2		)	(c)	—				1		(b)	(40		)	71
Total investment securities available-for-sale	136		(2		)	(c)	—				1		(b)	(40		)	95
Derivative assets:
Interest rate contracts	—		—				2			(d)	—			—			2
Warrants	4		1			(d)	(1		)	(d)	—			(1		)	3
Derivative liabilities:
Other	1		—				—				—			—			1
Six Months Ended June 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	22	$	—			$	—			$	1	(b)	$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	136		1			(c)	—				6		(b)	(25		)	118
Total investment securities available-for-sale	159		1			(c)	—				7		(b)	(25		)	142
Derivative assets:
Warrants	3		4			(d)	1			(d)	—			(4		)	4
Derivative liabilities:
Other	2		—				—				—			—			2

(a) Auction-rate securities.

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

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

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

ASSETS AND LIABILITIES RECORDED AT FAIR VALUE ON A NONRECURRING BASIS

The Corporation may be required, from time to time, to record certain assets and liabilities at fair value on a nonrecurring basis. These include assets that are recorded at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. All assets recorded at fair value on a nonrecurring basis were classified as Level 3 at June 30, 2015 and December 31, 2014 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014.

(in millions)	Level 3
June 30, 2015
Loans:
Commercial	$	18
Commercial mortgage	12
International	8
Total loans	38
Nonmarketable equity securities	1
Other real estate	4
Total assets at fair value	$	43
December 31, 2014
Loans:
Commercial	$	38
Commercial mortgage	26
Total loans	64
Nonmarketable equity securities	2
Other real estate	2
Total assets at fair value	$	68

Level 3 assets recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014 included loans for which a specific allowance was established based on the fair value of collateral and other real estate for which fair value of the properties was less than the cost basis. For both asset classes, the unobservable inputs were the additional adjustments applied by management to the appraised values to reflect such factors as non-current appraisals and revisions to estimated time to sell. These adjustments are determined based on qualitative judgments made by management on a case-by-case basis and are not quantifiable inputs, although they are used in the determination of fair value.

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

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
June 30, 2015
State and municipal securities (a)	$	23	3% - 8%	1 - 2
Equity and other non-debt securities (a)	71		4% - 8%	1
December 31, 2014
State and municipal securities (a)	$	23	3% - 9%	1 - 3
Equity and other non-debt securities (a)	112		4% - 8%	1 - 2

(a) Auction-rate securities.

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

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

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

	Carrying Amount			Estimated Fair Value
(in millions)				Total			Level 1		Level 2		Level 3
June 30, 2015
Assets
Cash and due from banks	$	1,148		$	1,148		$	1,148	$	—	$	—
Interest-bearing deposits with banks	4,817			4,817			4,817		—		—
Investment securities held-to-maturity	1,952			1,946			—		1,946		—
Loans held-for-sale	25			25			—		25		—
Total loans, net of allowance for loan losses (a)	49,123			49,009			—		—		49,009
Customers’ liability on acceptances outstanding	8			8			8		—		—
Nonmarketable equity securities (b)	11			18			—		—		18
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	28,167			28,167			—		28,167		—
Interest-bearing deposits	25,726			25,726			—		25,726		—
Customer certificates of deposit	4,367			4,357			—		4,357		—
Total deposits	58,260			58,250			—		58,250		—
Short-term borrowings	56			56			56		—		—
Acceptances outstanding	8			8			8		—		—
Medium- and long-term debt	2,841			2,835			—		2,835		—
Credit-related financial instruments	(95		)	(95		)	—		—		(95		)
December 31, 2014
Assets
Cash and due from banks	$	1,026		$	1,026		$	1,026	$	—	$	—
Interest-bearing deposits with banks	5,045			5,045			5,045		—		—
Investment securities held-to-maturity	1,935			1,933			—		1,933		—
Loans held-for-sale	5			5			—		5		—
Total loans, net of allowance for loan losses (a)	47,999			47,932			—		—		47,932
Customers’ liability on acceptances outstanding	10			10			10		—		—
Nonmarketable equity securities (b)	11			18			—		—		18
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	27,224			27,224			—		27,224		—
Interest-bearing deposits	25,841			25,841			—		25,841		—
Customer certificates of deposit	4,421			4,411			—		4,411		—
Total deposits	57,486			57,476			—		57,476		—
Short-term borrowings	116			116			116		—		—
Acceptances outstanding	10			10			10		—		—
Medium- and long-term debt	2,675			2,681			—		2,681		—
Credit-related financial instruments	(85		)	(85		)	—		—		(85		)

(a) Included $38 million and $64 million of impaired loans recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014, respectively.

(b) Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014, respectively.

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Derivative And Credit-Related Financial Instruments (Summary Of Internally Classified Watch List Letters Of Credit) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Total criticized standby and commercial letters of credit	$ 104	$ 79
As a percentage of total outstanding standby and commercial letters of credit	2.70%	2.00%

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Investment Securities Investment Securities (Gains and Losses on Available-For-Sale Securities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Securities gains	$ 0	$ 0	$ 0	$ 1
Securities losses	0	0	(2)	0
Net securities (losses) gains	$ 0	$ 0	$ (2)	$ 1

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Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2015

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

Schedule Of Accumulated Other Comprehensive Loss

The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the six months ended June 30, 2015 and 2014, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Six Months Ended June 30,
(in millions)	2015			2014
Accumulated net unrealized gains (losses) on investment securities:
Balance at beginning of period, net of tax	$	37		$	(68	)
Net unrealized holding (losses) gains arising during the period	(17		)	116
Less: (Benefit) provision for income taxes	(6		)	41
Net unrealized holding (losses) gains arising during the period, net of tax	(11		)	75
Less:
Net realized (losses) gains included in net securities (losses) gains	(2		)	1
Less: Benefit for income taxes	(1		)	—
Reclassification adjustment for net securities (losses) gains included in net income, net of tax	(1		)	1
Less:
Net losses realized as a yield adjustment in interest on investment securities	(4		)	—
Less: Benefit for income taxes	(1		)	—
Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax	(3		)	—
Change in net unrealized (losses) gains on investment securities, net of tax	(7		)	74
Balance at end of period, net of tax	$	30		$	6
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(449	)	$	(323	)
Amortization of actuarial net loss	35			18
Amortization of prior service cost	—			1
Amounts recognized in salaries and benefits expense	35			19
Less: Provision for income taxes	12			6
Change in defined benefit pension and other postretirement plans adjustment, net of tax	23			13
Balance at end of period, net of tax	$	(426	)	$	(310	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(396	)	$	(304	)

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Medium- And Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Schedule Of Medium- And Long-Term Debt

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

(in millions)	June 30, 2015		December 31, 2014
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	—	$	304
3.80% subordinated notes due 2026 (a)	253		257
Medium-term notes:
3.00% notes due 2015	300		300
2.125% notes due 2019 (a)	350		347
Total parent company	903		1,208
Subsidiaries
Subordinated notes:
5.75% subordinated notes due 2016 (a)	665		670
5.20% subordinated notes due 2017 (a)	541		548
7.875% subordinated notes due 2026 (a)	221		227
Total subordinated notes	1,427		1,445
Medium-term notes:
2.50% notes due 2020 (a)	495		—
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	16		22
Total subsidiaries	1,938		1,467
Total medium- and long-term debt	$	2,841	$	2,675

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

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Credit Quality And Allowance For Credit Losses (Accretable Yield For Acquired Purchased Credit-Impaired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Credit Quality And Allowance For Credit Losses [Abstract]
Balance at beginning of period	$ 1	$ 11	$ 1	$ 15
Reclassifications from nonaccretable	0	4	1	9
Accretion	0	(9)	(1)	(18)
Balance at end of period	$ 1	$ 6	$ 1	$ 6

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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Available-for-sale, Within one year, Amortized Cost		$ 78
Available-for-sale, After one year through five years, Amortized Cost		710
Available-for-sale, After five years through ten years, Amortized Cost		883
Available-for-sale, After ten years, Amortized Cost		6,329
Available-for-sale, Subtotal, Amortized Cost		8,000
Available-for-sale, Within one year, Fair Value		78
Available-for-sale, After one year through five years, Fair Value		712
Available-for-sale, After five years through ten years, Fair Value		923
Available-for-sale, After ten years, Fair Value		6,351
Available-for-sale, Subtotal, Fair Value		8,064
Investment securities available-for-sale, Amortized Cost	[1]	8,201	$ 8,035
Investment securities available-for-sale, Fair Value	[1]	8,267	8,116
Held-to-maturity, Within one year, Net Carrying Amount		0
Held-to-maturity, After one year through five Years, Net Carrying Amount		0
Held-to-maturity, After five years through ten years, Net Carrying Amount		0
Held-to-maturities, After ten years, Net Carrying Amount		1,952
Held-to-maturity Securities		1,952	1,935
Held-to-maturity, Within one year, Fair Value		0
Held-to-maturity Securities, After one year through five years, Fair Value		0
Held-to-maturity Securities, After five years through ten years, Fair Value		0
Held-to-maturity Securities, After ten years, Fair Value		1,946
Held-to-maturity Securities, Fair Value		1,946
Equity and Other Non-Debt Securities
Investment securities available-for-sale, Amortized Cost		201	242
Investment securities available-for-sale, Fair Value		203	242
Residential Mortgage-Backed Securities
Investment securities available-for-sale, Amortized Cost	[2]	7,200	7,192
Investment securities available-for-sale, Fair Value	[2]	7,262	7,274
Held-to-maturity Securities	[2],[3]	1,952	1,935
Held-to-maturity Securities, Fair Value	[2],[3]	$ 1,946	$ 1,933

[1] Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

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

[3] The amortized cost of investment securities held-to-maturity included net unrealized losses of $19 million at June 30, 2015 and $23 million at December 31, 2014 related to securities transferred to available-for-sale, which are included in accumulated other comprehensive loss.

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Net Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2015

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 June 30,				Six Months Ended June 30,
(in millions, except per share data)	2015		2014		2015		2014
Basic and diluted
Net income	$	135	$	151	$	269	$	290
Less:
Income allocated to participating securities	1		2		3		4
Net income attributable to common shares	$	134	$	149	$	266	$	286
Basic average common shares	176		179		176		180
Basic net income per common share	$	0.76	$	0.83	$	1.51	$	1.59
Basic average common shares	176		179		176		180
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	2		2		2		2
Net effect of the assumed exercise of warrants	4		5		4		4
Diluted average common shares	182		186		182		186
Diluted net income per common share	$	0.73	$	0.80	$	1.46	$	1.54

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

The following average shares related to outstanding options to purchase shares of common stock were not included in the computation of diluted net income per common share because the options were anti-dilutive for the period.

	Three Months Ended June 30,		Six Months Ended June 30,
(shares in millions)	2015	2014	2015	2014
Average outstanding options	5.0	7.2	5.9	7.9
Range of exercise prices	$49.22 - $60.82	$49.22 - $60.82	$46.68 - $60.82	$48.17 - $61.94

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Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2015

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 June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Service cost	$	9		$	8		$	18		$	15
Interest cost	22			22			44			44
Expected return on plan assets	(40		)	(33		)	(80		)	(66		)
Amortization of prior service cost	1			2			2			3
Amortization of net loss	15			7			29			15
Net periodic defined benefit cost	$	7		$	6		$	13		$	11

Non-Qualified Defined Benefit Pension Plan	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Service cost	$	1		$	1		$	2		$	2
Interest cost	3			3			5			5
Amortization of prior service credit	(1		)	(1		)	(2		)	(2		)
Amortization of net loss	2			1			5			3
Net periodic defined benefit cost	$	5		$	4		$	10		$	8

Postretirement Benefit Plan	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Interest cost	$	—		$	1		$	1		$	2
Expected return on plan assets	(1		)	(1		)	(2		)	(2		)
Amortization of net loss	1			—			1			—
Net periodic postretirement benefit cost	$	—		$	—		$	—		$	—

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Basis of Presentation and Accounting Policies

6 Months Ended

Jun. 30, 2015

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 six months ended June 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. 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, 2014.

Revenue Recognition

In the first quarter 2015, the Corporation entered into a new contract for an existing debit card program. Guidance provided in Accounting Standards Code 605-45, "Principal Agent Considerations," indicates whether revenue should be reported gross or net for this type of arrangement. Management assessed various principal versus agent indicators provided in the guidance and concluded that the Corporation bears the risks and rewards of providing the services for the card program based on the new contract terms and, therefore, gross presentation of revenues and expenses is appropriate. This change in presentation resulted in increases of $44 million and $88 million to both "card fees" in noninterest income and "outside processing fee expense" in noninterest expenses for the three- and six-month periods ended June 30, 2015, respectively.

Recently Adopted Accounting Pronouncements

Effective January 1, 2015, the Corporation prospectively adopted Accounting Standards Update (ASU) No. 2014-04, “Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure,” (ASU 2014-04), which clarifies when an in-substance foreclosure or repossession of residential real estate property occurs, requiring a creditor to reclassify the loan to other real estate. According to ASU 2014-04, a consumer mortgage loan should be reclassified to other real estate either upon the creditor obtaining legal title to the real estate collateral or when the borrower voluntarily conveys all interest in the real estate property to the creditor through a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also clarifies that a creditor that has obtained legal title to a foreclosed property should not delay reclassification when a borrower has a legal right of redemption for a period of time. The Corporation's existing accounting treatment is consistent with the new guidance, and therefore the adoption of ASU 2014-04 had no impact to the Corporation's financial condition and results of operations. Disclosures required by ASU 2014-04 are provided in Note 4.

Also effective January 1, 2015, the Corporation prospectively adopted ASU No. 2014-12, “Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” (ASU 2014-12). The new guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The Corporation's current accounting treatment of performance conditions for employees who are or become retirement eligible prior to the achievement of the performance target is consistent with ASU 2014-12, and as such the adoption of ASU 2014-12 had no impact to the Corporation’s financial condition and results of operations.

In the second quarter 2015, the Corporation early adopted ASU 2015-03, "Interest - Imputation of Interest (Subtopic 835-30)," which amends the presentation of debt issuance costs in the balance sheet as a direct deduction from the carrying amount of the related debt liability rather than as a deferred charge. The new guidance was retrospectively applied, which resulted in a decrease of $4 million to both "accrued income and other assets" and "medium- and long-term debt" on the consolidated balance sheets as of December 31, 2014. Unamortized debt issuance costs deducted from the carrying amount of medium- and long-term debt totaled $6 million at June 30, 2015.

Pending Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous GAAP comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. The guidance under ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2017 and must be retrospectively applied. Entities will have the option of presenting prior periods as impacted by the new guidance or presenting the cumulative effect of initial application along with supplementary disclosures. Early adoption is permitted, but not before annual and interim periods beginning after December 15, 2016. The Corporation is currently evaluating the impact of adopting ASU 2014-09.

In February 2015, the FASB issued ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis," (ASU 2015-02), which makes targeted amendments to the considerations applied by reporting entities when determining if a legal entity should be consolidated, including placing more emphasis on risk of loss when determining a controlling financial interest. Low-income housing tax credit investments that meet the criteria for the proportional amortization method are not impacted by these amendments. ASU 2015-02 is effective for annual and interim periods beginning after December 15, 2015, and must be retrospectively applied. Early adoption is permitted. The Corporation is currently evaluating the impact of adopting ASU 2015-02.

In April 2015, the FASB issued ASU 2015-05, "Goodwill and Other - Internal-Use Software (Subtopic 350-40)," (ASU 2015-05), which defines specific criteria entities must apply to determine if a cloud computing arrangement includes an in-substance software license. The result of the assessment will direct the entity to apply either software licensing or service contract guidance to record the related costs. ASU 2015-05 is effective for annual and interim periods beginning after December 15, 2015, and can be prospectively or retrospectively applied. Early adoption is permitted. The Corporation does not expect the adoption to have a material effect on its financial condition and results of operations.

In May 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent),” (ASU 2015-07) which amends disclosure requirements for entities that utilize net asset value per share (or its equivalent) to measure fair value as a practical expedient. The update eliminates the requirement to classify these investments within the fair value hierarchy and instead requires disclosure of sufficient information about these investments to permit reconciliation of the fair value of investments categorized within the fair value hierarchy to the investments presented in the consolidated balance sheet. ASU 2015-07 is effective for annual and interim periods beginning after December 15, 2015 and must be applied retrospectively. Early adoption is permitted. The adoption of ASU 2015-07 will have no impact on the Corporation's financial condition or results of operations.

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Business Segment Information (Tables)

6 Months Ended

Jun. 30, 2015

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 June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	155		$	45		$	(155	)	$	2		$	422
Provision for credit losses	61			(8		)	(9		)	—			3			47
Noninterest income	140			46			60			14			1			261
Noninterest expenses	176			182			74			3			1			436
Provision (benefit) for income taxes (FTE)	96			9			14			(54		)	—			65
Net income (loss)	$	182		$	18		$	26		$	(90	)	$	(1	)	$	135
Net loan charge-offs (recoveries)	$	22		$	1		$	(5	)	$	—		$	—		$	18
Selected average balances:
Assets	$	39,135		$	6,459		$	5,153		$	11,721		$	6,495		$	68,963
Loans	38,109			5,770			4,954			—			—			48,833
Deposits	30,229			22,747			4,060			93			269			57,398
Statistical data:
Return on average assets (a)	1.87		%	0.30		%	2.01		%	N/M			N/M			0.79		%
Efficiency ratio (b)	34.19		%	89.88		%	70.27		%	N/M			N/M			63.68		%

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Three Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	152		$	44		$	(160	)	$	6		$	417
Provision for credit losses	35			(6		)	(10		)	—			(8		)	11
Noninterest income	100			41			62			15			2			220
Noninterest expenses	143			174			76			2			9			404
Provision (benefit) for income taxes (FTE)	100			9			15			(56		)	3			71
Net income (loss)	$	197		$	16		$	25		$	(91	)	$	4		$	151
Net loan charge-offs (recoveries)	$	9		$	3		$	(3	)	$	—		$	—		$	9
Selected average balances:
Assets	$	37,305		$	6,222		$	4,987		$	11,055		$	5,309		$	64,878
Loans	36,367			5,554			4,804			—			—			46,725
Deposits	27,351			21,890			3,616			258			269			53,384
Statistical data:
Return on average assets (a)	2.11		%	0.29		%	2.02		%	N/M			N/M			0.93		%
Efficiency ratio b)	30.07		%	90.06		%	72.11		%	N/M			N/M			63.35		%

(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

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Six Months Ended June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	744		$	307		$	88		$	(308	)	$	5		$	836
Provision for credit losses	86			(16		)	(10		)	—			1			61
Noninterest income	282			88			118			27			1			516
Noninterest expenses	376			357			151			5			6			895
Provision (benefit) for income taxes (FTE)	193			19			23			(107		)	(1		)	127
Net income (loss)	$	371		$	35		$	42		$	(179	)	$	—		$	269
Net loan charge-offs (recoveries)	$	31		$	2		$	(7	)	$	—		$	—		$	26
Selected average balances:
Assets	$	38,896		$	6,414		$	5,091		$	11,930		$	6,521		$	68,852
Loans	37,868			5,732			4,894			—			—			48,494
Deposits	30,187			22,577			4,028			131			273			57,196
Statistical data:
Return on average assets (a)	1.91		%	0.30		%	1.65		%	N/M			N/M			0.78		%
Efficiency ratio (b)	36.69			90.22			72.40			N/M			N/M			66.07

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Six Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	744		$	301		$	89		$	(318	)	$	12		$	828
Provision for credit losses	52			(5		)	(18		)	—			(9		)	20
Noninterest income	191			82			122			29			4			428
Noninterest expenses	289			348			152			5			16			810
Provision (benefit) for income taxes (FTE)	199			14			28			(111		)	6			136
Net income (loss)	$	395		$	26		$	49		$	(183	)	$	3		$	290
Net loan charge-offs (recoveries)	$	20		$	6		$	(5	)	$	—		$	—		$	21
Selected average balances:
Assets	$	36,522		$	6,224		$	4,959		$	11,092		$	5,997		$	64,794
Loans	35,567			5,555			4,783			—			—			45,905
Deposits	27,173			21,759			3,599			305			243			53,079
Statistical data:
Return on average assets (a)	2.16		%	0.24		%	1.99		%	N/M			N/M			0.90		%
Efficiency ratio (b)	30.85			90.69			72.61			N/M			N/M			64.55

(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 June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	179		$	181		$	130		$	85		$	(153	)	$	422
Provision for credit losses	(13		)	4			43			10			3			47
Noninterest income	85			37			31			93			15			261
Noninterest expenses	128			100			94			110			4			436
Provision (benefit) for income taxes (FTE)	51			43			10			15			(54		)	65
Net income (loss)	$	98		$	71		$	14		$	43		$	(91	)	$	135
Net loan charge-offs (recoveries)	$	(2	)	$	6		$	5		$	9		$	—		$	18
Selected average balances:
Assets	$	13,852		$	16,696		$	11,878		$	8,321		$	18,216		$	68,963
Loans	13,290			16,429			11,254			7,860			—			48,833
Deposits	21,706			17,275			10,959			7,096			362			57,398
Statistical data:
Return on average assets (a)	1.73		%	1.54		%	0.46		%	2.05		%	N/M			0.79		%
Efficiency ratio (b)	48.21		%	46.04		%	58.20		%	61.45		%	N/M			63.68		%

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	182		$	176		$	137		$	76		$	(154	)	$	417
Provision for credit losses	(9		)	14			22			(8		)	(8		)	11
Noninterest income	89			38			35			41			17			220
Noninterest expenses	159			100			89			45			11			404
Provision (benefit) for income taxes (FTE)	44			37			22			21			(53		)	71
Net income (loss)	$	77		$	63		$	39		$	59		$	(87	)	$	151
Net loan charge-offs (recoveries)	$	10		$	5		$	2		$	(8	)	$	—		$	9
Selected average balances:
Assets	$	13,851		$	15,721		$	11,661		$	7,281		$	16,364		$	64,878
Loans	13,482			15,439			10,966			6,838			—			46,725
Deposits	20,694			15,370			10,724			6,069			527			53,384
Statistical data:
Return on average assets (a)	1.42		%	1.54		%	1.30		%	3.28		%	N/M			0.93		%
Efficiency ratio (b)	58.67		%	46.64		%	51.67		%	38.73		%	N/M			63.35		%

(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

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Six Months Ended June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	357		$	357		$	260		$	165		$	(303	)	$	836
Provision for credit losses	(21		)	1			64			16			1			61
Noninterest income	166			74			67			181			28			516
Noninterest expenses	283			199			189			213			11			895
Provision (benefit) for income taxes (FTE)	89			87			28			31			(108		)	127
Net income (loss)	$	172		$	144		$	46		$	86		$	(179	)	$	269
Net loan charge-offs	$	1		$	6		$	8		$	11		$	—		$	26
Selected average balances:
Assets	$	13,794		$	16,580		$	12,034		$	7,993		$	18,451		$	68,852
Loans	13,257			16,312			11,394			7,531			—			48,494
Deposits	21,709			17,057			10,985			7,041			404			57,196
Statistical data:
Return on average assets (a)	1.52		%	1.59		%	0.74		%	2.15		%	N/M			0.78		%
Efficiency ratio (b)	54.14			46.20			57.81			61.01			N/M			66.07

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Six Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	364		$	349		$	273		$	148		$	(306	)	$	828
Provision for credit losses	(5		)	25			29			(20		)	(9		)	20
Noninterest income	173			73			69			80			33			428
Noninterest expenses	320			197			179			93			21			810
Provision (benefit) for income taxes (FTE)	80			74			48			39			(105		)	136
Net income (loss)	$	142		$	126		$	86		$	116		$	(180	)	$	290
Net loan charge-offs (recoveries)	$	10		$	15		$	8		$	(12	)	$	—		$	21
Selected average balances:
Assets	$	13,835		$	15,429		$	11,367		$	7,074		$	17,089		$	64,794
Loans	13,478			15,133			10,667			6,627			—			45,905
Deposits	20,668			15,078			10,799			5,986			548			53,079
Statistical data:
Return on average assets (a)	1.32		%	1.57		%	1.43		%	3.28		%	N/M			0.90		%
Efficiency ratio (b)	59.56			46.62			52.30			40.99			N/M			64.55

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

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

FTE – Fully Taxable Equivalent

N/M – not meaningful

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Investment Securities (Narrative) (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015 USD ($) Security	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Security	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Securities with no credit impairment in unrealized loss position | Security		112		112
Securities gains		$ 0	$ 0	$ 0	$ 1
Securities losses		0	0	(2)	0
Net securities (losses) gains		0	$ 0	(2)	$ 1
Investment securities available-for-sale, Amortized Cost	[1]	8,201		8,201		$ 8,035
Investment securities available-for-sale, Fair Value	[1]	8,267		8,267		8,116
Investment securities held-to-maturity, Amortized Cost		1,952		1,952		1,935
Investment securities held-to-maturity, Fair Value		1,946		1,946
Carrying value of securities pledged		2,800		2,800
Liabilities secured by pledged collateral		$ 2,200		$ 2,200
Residential Mortgage-Backed Securities
Securities with no credit impairment in unrealized loss position | Security		93		93
Investment securities available-for-sale, Amortized Cost	[2]	$ 7,200		$ 7,200		7,192
Investment securities available-for-sale, Fair Value	[2]	7,262		7,262		7,274
Investment securities held-to-maturity, Amortized Cost	[2],[3]	1,952		1,952		1,935
Investment securities held-to-maturity, Fair Value	[2],[3]	$ 1,946		$ 1,946		1,933
Auction-Rate State And Municipal Securities
Securities with no credit impairment in unrealized loss position		17		17
Auction-Rate Corporate Debt Securities
Securities with no credit impairment in unrealized loss position | Security		1		1
Investment securities available-for-sale, Amortized Cost		$ 47		$ 47		51
Investment securities available-for-sale, Fair Value		$ 47		$ 47		51
U.S. Treasury and Other U.S. Government Agency Securities
Securities with no credit impairment in unrealized loss position		1		1
Investment securities available-for-sale, Amortized Cost		$ 729		$ 729		526
Investment securities available-for-sale, Fair Value		732		$ 732		526
Auction-Rate Securities
ARS portfolio redeemed or sold since acquisition				93.00%
ARS portfolio redeemed or sold since acquisition at or above cost				92.00%
Investment securities available-for-sale, Amortized Cost		95		$ 95		137
Investment securities available-for-sale, Fair Value		$ 95		$ 95		$ 136

[1] Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

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

[3] The amortized cost of investment securities held-to-maturity included net unrealized losses of $19 million at June 30, 2015 and $23 million at December 31, 2014 related to securities transferred to available-for-sale, which are included in accumulated other comprehensive loss.

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Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings By Type Of Modification) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		$ 5	$ 1	$ 8	$ 12
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	4	0	$ 7	$ 10
Extension Term, Minimum Period				90 days	90 days
Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		1	1	$ 1	$ 2
Business loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		4	0	7	10
Business loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	4	0	7	10
Business loans | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0	0	0	0
Business loans | Commercial
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		2	0	2	1
Business loans | Commercial | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	2	0	2	1
Business loans | Commercial | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0	0	0	0
Business loans | Commercial mortgage
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		2	0	5	8
Business loans | Commercial mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	2	0	5	8
Business loans | Commercial mortgage | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0	0	0	0
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[2]	1	0	1	0
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	[1],[2]	1	0	1	0
Business loans | Commercial mortgage | Commercial Real Estate business line | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[2]	0	0	0	0
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	1	0	4	8
Business loans | Commercial mortgage | Other business lines | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1],[3]	1	0	4	8
Business loans | Commercial mortgage | Other business lines | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	0	0	0	0
Business loans | International
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period				0	1
Business loans | International | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]			0	1
Business loans | International | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period				0	0
Retail loans | Consumer | Home equity
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		1	1	1	2
Retail loans | Consumer | Home equity | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	0	0	0	0
Retail loans | Consumer | Home equity | Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		$ 1	$ 1	$ 1	$ 2

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

[2] Primarily loans to real estate developers.

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

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Contingent Liabilities (Narrative) (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 17, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Loss Contingencies [Line Items]
Legal fees		$ 5,000,000	$ 5,000,000	$ 10,000,000	$ 10,000,000
Pending Litigation
Loss Contingencies [Line Items]
Minimum amount of reasonably possible losses		0		0
Estimated maximum amount of reasonably possible losses		43,000,000		$ 43,000,000
Butte Local Development v. Masters Group v. Comerica Bank
Loss Contingencies [Line Items]
Amount of damages awarded by the jury	$ 52,000,000
Economic damages sought		$ 25,000,000

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Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks		$ 1,148	$ 1,026
Interest-bearing deposits with banks		4,817	5,045
Other short-term investments		119	99
Investment securities available-for-sale	[1]	8,267	8,116
Investment securities held-to-maturity		1,952	1,935
Commercial loans		32,723	31,520
Real estate construction loans		1,795	1,955
Commercial mortgage loans		8,674	8,604
Lease financing		786	805
International loans		1,420	1,496
Residential mortgage loans		1,865	1,831
Consumer loans		2,478	2,382
Total loans		49,741	48,593
Less allowance for loan losses		(618)	(594)
Net loans		49,123	47,999
Premises and equipment		541	532
Accrued income and other assets		3,978	4,434
Total assets		69,945	69,186
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing deposits		28,167	27,224
Money market and interest-bearing checking deposits		23,786	23,954
Savings deposits		1,841	1,752
Customer certificates of deposit		4,367	4,421
Foreign office time deposits		99	135
Total interest-bearing deposits		30,093	30,262
Total deposits		58,260	57,486
Short-term borrowings		56	116
Accrued expenses and other liabilities		1,265	1,507
Medium- and long-term debt		2,841	2,675
Total liabilities		62,422	61,784
Common stock - $5 par value: Authorized - 325,000,000 shares; Issued - 228,164,824 shares		1,141	1,141
Capital surplus		2,158	2,188
Accumulated other comprehensive loss		(396)	(412)
Retained earnings		6,908	6,744
Less cost of common stock in treasury - 49,803,515 shares at 6/30/15 and 49,146,225 shares at 12/31/14		(2,288)	(2,259)
Total shareholders' equity		7,523	7,402
Total liabilities and shareholders' equity		$ 69,945	$ 69,186

[1] Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

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Credit Quality And Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Retail loans secured by residential real estate in process of foreclosure	$ 1		$ 1
Commitments to lend additional funds to TDR borrowers	0		0		$ 3
Allowance for PCI loans	0		0		$ 0
Interest Rate Reductions
Carrying value at period end of loans modified during the period	2	$ 5	2	$ 5
Subsequent default during period	$ 0	$ 0	$ 0	$ 0

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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$ 0.21	$ 0.20	$ 0.41	$ 0.39

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Derivative And Credit-Related Financial Instruments (Schedule Of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps) (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Notional Amount	[1]	$ 21,385	$ 21,562
Risk Management Purposes
Notional Amount	[1]	2,657	2,308
Long-term Debt | Swaps - Fair Value Hedge - Receive Fixed/Pay Floating | Risk Management Purposes | Interest Rate Swaps
Notional Amount		$ 2,000	$ 1,800
Weighted Average Remaining Maturity		5 years 10 days	4 years 7 months
Weighted Average Receive Rate		3.99%	4.54%
Weighted Average Pay Rate	[2]	0.76%	0.49%

[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 June 30, 2015 and December 31, 2014.

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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	[1]	$ 8,267		$ 8,116
Derivative assets		669		894
Derivative liabilities	[2]	350		528
Equity and Other Non-Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		203		242
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		732		526
Residential Mortgage-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	[3]	7,262		7,274
State And Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		23		23
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		47		51
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		8,267		8,116
Derivative assets		672		898
Total assets at fair value		9,034		9,108
Derivative liabilities		470		662
Deferred compensation plan liabilities		94		94
Total liabilities at fair value		564		756
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		864		656
Derivative assets		0		0
Total assets at fair value		959		750
Derivative liabilities		0		0
Deferred compensation plan liabilities		94		94
Total liabilities at fair value		94		94
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		7,308		7,324
Derivative assets		667		894
Total assets at fair value		7,975		8,218
Derivative liabilities		469		661
Deferred compensation plan liabilities		0		0
Total liabilities at fair value		469		661
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		95		136
Derivative assets		5		4
Total assets at fair value		100		140
Derivative liabilities		1		1
Deferred compensation plan liabilities		0		0
Total liabilities at fair value		1		1
Recurring | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		284		328
Derivative liabilities		90		102
Recurring | Interest Rate Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Recurring | Interest Rate Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		282		328
Derivative liabilities		90		102
Recurring | Interest Rate Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		2		0
Derivative liabilities		0		0
Recurring | Energy Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		349		527
Derivative liabilities		348		525
Recurring | Energy Derivative Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Recurring | Energy Derivative Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		349		527
Derivative liabilities		348		525
Recurring | Energy Derivative Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Recurring | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		36		39
Derivative liabilities		31		34
Recurring | Foreign Exchange Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Recurring | Foreign Exchange Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		36		39
Derivative liabilities		31		34
Recurring | Foreign Exchange Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Derivative liabilities		0		0
Recurring | Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		3		4
Recurring | Warrants | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Recurring | Warrants | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0		0
Recurring | Warrants | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		3		4
Recurring | Other Derivative Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		1		1
Recurring | Other Derivative Liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		0		0
Recurring | Other Derivative Liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		0		0
Recurring | Other Derivative Liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		1		1
Recurring | Deferred Compensation Plan Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		94		94
Recurring | Deferred Compensation Plan Assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		94		94
Recurring | Deferred Compensation Plan Assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Recurring | Deferred Compensation Plan Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Recurring | Equity and Other Non-Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1
Investment securities available-for-sale		203		242
Recurring | Equity and Other Non-Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1
Investment securities available-for-sale		132		130
Recurring | Equity and Other Non-Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
Investment securities available-for-sale		0		0
Recurring | Equity and Other Non-Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
Investment securities available-for-sale		71	[4]	112	[5]
Recurring | U.S. Treasury and Other U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		732		526
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		732		526
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0		0
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0		0
Recurring | Residential Mortgage-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		7,262	[6]	7,274	[7]
Recurring | Residential Mortgage-Backed Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0	[6]	0	[7]
Recurring | Residential Mortgage-Backed Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		7,262	[6]	7,274	[7]
Recurring | Residential Mortgage-Backed Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0	[6]	0	[7]
Recurring | State And Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		23		23
Recurring | State And Municipal Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0		0
Recurring | State And Municipal Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0		0
Recurring | State And Municipal Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		23	[4]	23	[5]
Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		47		51
Recurring | Corporate Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0		0
Recurring | Corporate Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		46		50
Recurring | Corporate Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		$ 1	[4]	$ 1	[5]

[1] Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

[2] Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $4 million and $2 million at June 30, 2015 and December 31, 2014, respectively.

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

[4] Auction-rate securities.

[5] Auction-rate securities.

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

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

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Medium- And Long-Term Debt (Narrative) (Details) - Jun. 30, 2015 - USD ($) $ in Millions		Total
Debt Instrument [Line Items]
Blanket lien on real estate-related loans securing FHLB advances		$ 14,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds		6,000
Subsidiaries | 2.50% notes due 2020
Debt Instrument [Line Items]
Notes issued	[1]	$ 500
Stated interest rate	[1]	2.50%

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

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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Revenue Recognition

Revenue Recognition

In the first quarter 2015, the Corporation entered into a new contract for an existing debit card program. Guidance provided in Accounting Standards Code 605-45, "Principal Agent Considerations," indicates whether revenue should be reported gross or net for this type of arrangement. Management assessed various principal versus agent indicators provided in the guidance and concluded that the Corporation bears the risks and rewards of providing the services for the card program based on the new contract terms and, therefore, gross presentation of revenues and expenses is appropriate. This change in presentation resulted in increases of $44 million and $88 million to both "card fees" in noninterest income and "outside processing fee expense" in noninterest expenses for the three- and six-month periods ended June 30, 2015, respectively.

Recently Adopted and Pending Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Effective January 1, 2015, the Corporation prospectively adopted Accounting Standards Update (ASU) No. 2014-04, “Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure,” (ASU 2014-04), which clarifies when an in-substance foreclosure or repossession of residential real estate property occurs, requiring a creditor to reclassify the loan to other real estate. According to ASU 2014-04, a consumer mortgage loan should be reclassified to other real estate either upon the creditor obtaining legal title to the real estate collateral or when the borrower voluntarily conveys all interest in the real estate property to the creditor through a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also clarifies that a creditor that has obtained legal title to a foreclosed property should not delay reclassification when a borrower has a legal right of redemption for a period of time. The Corporation's existing accounting treatment is consistent with the new guidance, and therefore the adoption of ASU 2014-04 had no impact to the Corporation's financial condition and results of operations. Disclosures required by ASU 2014-04 are provided in Note 4.

Also effective January 1, 2015, the Corporation prospectively adopted ASU No. 2014-12, “Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” (ASU 2014-12). The new guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The Corporation's current accounting treatment of performance conditions for employees who are or become retirement eligible prior to the achievement of the performance target is consistent with ASU 2014-12, and as such the adoption of ASU 2014-12 had no impact to the Corporation’s financial condition and results of operations.

In the second quarter 2015, the Corporation early adopted ASU 2015-03, "Interest - Imputation of Interest (Subtopic 835-30)," which amends the presentation of debt issuance costs in the balance sheet as a direct deduction from the carrying amount of the related debt liability rather than as a deferred charge. The new guidance was retrospectively applied, which resulted in a decrease of $4 million to both "accrued income and other assets" and "medium- and long-term debt" on the consolidated balance sheets as of December 31, 2014. Unamortized debt issuance costs deducted from the carrying amount of medium- and long-term debt totaled $6 million at June 30, 2015.

Pending Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous GAAP comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. The guidance under ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2017 and must be retrospectively applied. Entities will have the option of presenting prior periods as impacted by the new guidance or presenting the cumulative effect of initial application along with supplementary disclosures. Early adoption is permitted, but not before annual and interim periods beginning after December 15, 2016. The Corporation is currently evaluating the impact of adopting ASU 2014-09.

In February 2015, the FASB issued ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis," (ASU 2015-02), which makes targeted amendments to the considerations applied by reporting entities when determining if a legal entity should be consolidated, including placing more emphasis on risk of loss when determining a controlling financial interest. Low-income housing tax credit investments that meet the criteria for the proportional amortization method are not impacted by these amendments. ASU 2015-02 is effective for annual and interim periods beginning after December 15, 2015, and must be retrospectively applied. Early adoption is permitted. The Corporation is currently evaluating the impact of adopting ASU 2015-02.

In April 2015, the FASB issued ASU 2015-05, "Goodwill and Other - Internal-Use Software (Subtopic 350-40)," (ASU 2015-05), which defines specific criteria entities must apply to determine if a cloud computing arrangement includes an in-substance software license. The result of the assessment will direct the entity to apply either software licensing or service contract guidance to record the related costs. ASU 2015-05 is effective for annual and interim periods beginning after December 15, 2015, and can be prospectively or retrospectively applied. Early adoption is permitted. The Corporation does not expect the adoption to have a material effect on its financial condition and results of operations.

In May 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent),” (ASU 2015-07) which amends disclosure requirements for entities that utilize net asset value per share (or its equivalent) to measure fair value as a practical expedient. The update eliminates the requirement to classify these investments within the fair value hierarchy and instead requires disclosure of sufficient information about these investments to permit reconciliation of the fair value of investments categorized within the fair value hierarchy to the investments presented in the consolidated balance sheet. ASU 2015-07 is effective for annual and interim periods beginning after December 15, 2015 and must be applied retrospectively. Early adoption is permitted. The adoption of ASU 2015-07 will have no impact on the Corporation's financial condition or results of operations.

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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		3 Months Ended			6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014
Interest Rate Contracts
Balance at beginning of period		$ 11			$ 0
Realized gains (losses) recorded in earnings		0			0
Unrealized gains (losses) recorded in earnings	[1]	(9)			2
Gains (losses) recorded in other comprehensive income		0			0
Sales		0			0
Balance at end of period		2			2
Warrants
Balance at beginning of period		3	$ 3		4		$ 3
Realized gains (losses) recorded in earnings	[1]	1	4		1		4
Unrealized gains (losses) recorded in earnings		0	0		(1)	[1]	1	[1]
Gains (losses) recorded in other comprehensive income		0	0		0		0
Sales		(1)	(3)		(1)		(4)
Balance at end of period		3	4		3		4
Other Derivative Liabilities
Balance at beginnning of period		1	2		1		2
Realized gains (losses) recorded in earnings		0	0		0		0
Unrealized gains (losses) recorded in earnings		0	0		0		0
Gains (losses) recorded in other comprehensive income		0	0		0		0
Sales		0	0		0		0
Balance at end of period		1	2		1		2
Investment Securities Available-For-Sale
Balance at beginning of period		95	142		136		159
Realized gains (losses) recorded in earnings		0	0		(2)	[2]	1	[2]
Unrealized gains (losses) recorded in earnings		0	0		0		0
Gains (losses) recorded in other comprehensive income		0	1	[3]	1	[3]	7	[3]
Sales		0	(1)		(40)		(25)
Balance at end of period		95	142		95		142
State And Municipal Securities | Investment Securities Available-For-Sale
Balance at beginning of period	[4]	23	23		23		22
Realized gains (losses) recorded in earnings	[4]	0	0		0		0
Unrealized gains (losses) recorded in earnings	[4]	0	0		0		0
Gains (losses) recorded in other comprehensive income	[4]	0	0		0		1	[3]
Sales	[4]	0	0		0		0
Balance at end of period	[4]	23	23		23		23
Corporate Debt Securities | Investment Securities Available-For-Sale
Balance at beginning of period	[4]	1	1		1		1
Realized gains (losses) recorded in earnings	[4]	0	0		0		0
Unrealized gains (losses) recorded in earnings	[4]	0	0		0		0
Gains (losses) recorded in other comprehensive income	[4]	0	0		0		0
Sales	[4]	0	0		0		0
Balance at end of period	[4]	1	1		1		1
Equity and Other Non-Debt Securities | Investment Securities Available-For-Sale
Balance at beginning of period	[4]	71	118		112		136
Realized gains (losses) recorded in earnings	[4]	0	0		(2)	[2]	1	[2]
Unrealized gains (losses) recorded in earnings	[4]	0	0		0		0
Gains (losses) recorded in other comprehensive income	[4]	0	1	[3]	1	[3]	6	[3]
Sales	[4]	0	(1)		(40)		(25)
Balance at end of period	[4]	$ 71	$ 118		$ 71		$ 118

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

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

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

[4] Auction-rate securities.

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Investment Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Summary Of Investment Securities

A summary of the Corporation’s investment securities follows:

(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
June 30, 2015
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	$	729	$	4	$	1	$	732
Residential mortgage-backed securities (a)	7,200		106		44		7,262
State and municipal securities	24		—		1		23
Corporate debt securities	47		—		—		47
Equity and other non-debt securities	201		2		—		203
Total investment securities available-for-sale (b)	$	8,201	$	112	$	46	$	8,267
Investment securities held-to-maturity (c):
Residential mortgage-backed securities (a)	$	1,952	$	2	$	8	$	1,946
December 31, 2014
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	$	526	$	—	$	—	$	526
Residential mortgage-backed securities (a)	7,192		122		40		7,274
State and municipal securities	24		—		1		23
Corporate debt securities	51		—		—		51
Equity and other non-debt securities	242		1		1		242
Total investment securities available-for-sale (b)	$	8,035	$	123	$	42	$	8,116
Investment securities held-to-maturity (c):
Residential mortgage-backed securities (a)	$	1,935	$	—	$	2	$	1,933

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

(b) Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

(c) The amortized cost of investment securities held-to-maturity included net unrealized losses of $19 million at June 30, 2015 and $23 million at December 31, 2014 related to securities transferred to available-for-sale, which are included in accumulated other comprehensive loss.

Summary Of Investment Securities In Unrealized Loss Positions

A summary of the Corporation’s investment securities in an unrealized loss position as of June 30, 2015 and December 31, 2014 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
June 30, 2015
U.S. Treasury and other U.S. government agency securities	$	212	$	1		$	—	$	—		$	212	$	1
Residential mortgage-backed securities (b)	1,637		15			2,188		59			3,825		74
State and municipal securities (c)	—		—			23		1			23		1
Corporate debt securities (c)	—		—			1		—		(a)	1		—		(a)
Total temporarily impaired securities	$	1,849	$	16		$	2,212	$	60		$	4,061	$	76
December 31, 2014
U.S. Treasury and other U.S. government agency securities	$	298	$	—	(a)	$	—	$	—		$	298	$	—	(a)
Residential mortgage-backed securities (b)	626		3			3,112		71			3,738		74
State and municipal securities (c)	—		—			22		1			22		1
Corporate debt securities (c)	—		—			1		—		(a)	1		—		(a)
Equity and other non-debt securities (c)	—		—			112		1			112		1
Total temporarily impaired securities	$	924	$	3		$	3,247	$	73		$	4,171	$	76

(a) Unrealized losses less than $0.5 million.

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

(c) Auction-rate securities.

Summary of Net Securities Gains (Losses)

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

	Six Months Ended June 30,
(in millions)	2015			2014
Securities gains	$	—		$	1
Securities losses	(2		)	—
Net securities (losses) gains	$	(2	)	$	1

There were no securities gains or losses for both the three-month periods ended June 30, 2015 and 2014.

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)	Available-for-sale				Held-to-maturity
June 30, 2015	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Contractual maturity
Within one year	$	78	$	78	$	—	$	—
After one year through five years	710		712		—		—
After five years through ten years	883		923		—		—
After ten years	6,329		6,351		1,952		1,946
Subtotal	8,000		8,064		1,952		1,946
Equity and other non-debt securities	201		203
Total investment securities	$	8,201	$	8,267	$	1,952	$	1,946

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Net Income Per Common Share (Basic And Diluted Net Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 135	$ 151	$ 269	$ 290
Income allocated to participating securities	1	2	3	4
Net income attributable to common shares	$ 134	$ 149	$ 266	$ 286
Basic average common shares	176	179	176	180
Basic net income per common share	$ 0.76	$ 0.83	$ 1.51	$ 1.59
Basic average common shares	176	179	176	180
Net effect of the assumed exercise of stock options	2	2	2	2
Net effect of the assumed exercise of warrants	4	5	4	4
Diluted average common shares	182	186	182	186
Diluted net income per common share	$ 0.73	$ 0.80	$ 1.46	$ 1.54

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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net income	$ 269	$ 290
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	61	20
Benefit for deferred income taxes	(25)	(13)
Depreciation and amortization	60	61
Net periodic defined benefit cost	23	19
Share-based compensation expense	24	22
Net amortization of securities	8	5
Accretion of loan purchase discount	(4)	(22)
Net securities losses (gains)	2	(1)
Net gains on sales of foreclosed property	(1)	(2)
Excess tax benefits from share-based compensation arrangements	(3)	(6)
Net change in trading securities	0	5
Net change in accrued income receivable	(4)	(1)
Net change in accrued expenses payable	(83)	(60)
Other, net	67	29
Net cash provided by operating activities	394	346
INVESTING ACTIVITIES
Maturities and redemptions of investment securities available-for-sale	842	825
Sales of investment securities available-for-sale	37	0
Purchases of investment securities available-for-sale	(1,055)	(940)
Maturities and redemptions of investment securities held-to-maturity	153	0
Purchases of investment securities held-to-maturity	(166)	0
Net change in loans	(1,188)	(2,422)
Proceeds from sales of foreclosed property	5	9
Net increase in premises and equipment	(54)	(31)
Sales of Federal Home Loan Bank stock	0	41
Other, net	2	1
Net cash used in investing activities	(1,424)	(2,517)
FINANCING ACTIVITIES
Net change in deposits	971	763
Net change in short-term borrowings	(60)	(77)
Maturities and redemptions of medium- and long-term debt	(306)	(1,256)
Issuances of medium- and long-term debt	497	349
Repurchases of common stock	(115)	(141)
Cash dividends paid on common stock	(72)	(65)
Issuances of common stock under employee stock plans	18	36
Purchase and retirement of warrants	(10)	0
Excess tax benefits from share-based compensation arrangements	3	6
Other, net	(2)	(1)
Net cash provided by (used in) financing activities	924	(386)
Net decrease in cash and cash equivalents	(106)	(2,557)
Cash and cash equivalents at beginning of period	6,071	6,451
Cash and cash equivalents at end of period	5,965	3,894
Interest paid	45	50
Income tax paid	(11)	110
Noncash investing and financing activities:
Loans transferred to other real estate	4	11
Loans transferred from portfolio to held-for-sale	$ 19	$ 0

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Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2015	Dec. 31, 2014
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	49,803,515	49,146,225

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Employee Benefit Plans

6 Months Ended

Jun. 30, 2015

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 June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Service cost	$	9		$	8		$	18		$	15
Interest cost	22			22			44			44
Expected return on plan assets	(40		)	(33		)	(80		)	(66		)
Amortization of prior service cost	1			2			2			3
Amortization of net loss	15			7			29			15
Net periodic defined benefit cost	$	7		$	6		$	13		$	11

Non-Qualified Defined Benefit Pension Plan	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Service cost	$	1		$	1		$	2		$	2
Interest cost	3			3			5			5
Amortization of prior service credit	(1		)	(1		)	(2		)	(2		)
Amortization of net loss	2			1			5			3
Net periodic defined benefit cost	$	5		$	4		$	10		$	8

Postretirement Benefit Plan	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Interest cost	$	—		$	1		$	1		$	2
Expected return on plan assets	(1		)	(1		)	(2		)	(2		)
Amortization of net loss	1			—			1			—
Net periodic postretirement benefit cost	$	—		$	—		$	—		$	—

For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2014 Annual Report.

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Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 24, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
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	2015
Document Fiscal Period Focus	Q2
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		177,928,704
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

6 Months Ended

Jun. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes and Tax-Related Items

INCOME TAXES AND TAX-RELATED ITEMS

At June 30, 2015, net unrecognized tax benefits were $22 million, compared to $14 million at December 31, 2014. The Corporation anticipates that it is reasonably possible that final settlement of federal and state tax issues will result in a decrease in net unrecognized tax benefits of $8 million within the next twelve months. Included in "accrued expense and other liabilities" on the consolidated balance sheets was a $3 million liability for tax-related interest and penalties at June 30, 2015 compared to $2 million at December 31, 2014.

Net deferred tax assets were $135 million at June 30, 2015, compared to $130 million at December 31, 2014. Deferred tax assets were evaluated for realization and it was determined that no valuation allowance was needed at both June 30, 2015 and December 31, 2014. This conclusion was based on sufficient taxable income in the carryback period and projected future reversals of existing taxable temporary differences to absorb the deferred tax assets.

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	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
INTEREST INCOME
Interest and fees on loans	$ 389	$ 385	$ 767	$ 761
Interest on investment securities	52	53	105	108
Interest on short-term investments	3	3	7	7
Total interest income	444	441	879	876
INTEREST EXPENSE
Interest on deposits	11	11	22	22
Interest on medium- and long-term debt	12	14	23	28
Total interest expense	23	25	45	50
Net interest income	421	416	834	826
Provision for credit losses	47	11	61	20
Net interest income after provision for credit losses	374	405	773	806
NONINTEREST INCOME
Service charges on deposit accounts	56	54	111	108
Fiduciary income	48	45	95	89
Commercial lending fees	22	23	47	43
Card fees	72	22	139	45
Letter of credit fees	13	15	26	29
Bank-owned life insurance	10	11	19	20
Foreign exchange income	9	12	19	21
Brokerage fees	5	4	9	9
Net securities (losses) gains	0	0	(2)	1
Other noninterest income	26	34	53	63
Total noninterest income	261	220	516	428
NONINTEREST EXPENSES
Salaries and benefits expense	251	240	504	487
Net occupancy expense	39	39	77	79
Equipment expense	13	15	26	29
Outside processing fee expense	85	30	162	58
Software expense	24	25	47	47
Litigation-related expense	(30)	3	(29)	6
FDIC insurance expense	9	8	18	16
Advertising expense	6	5	12	11
Other noninterest expenses	39	39	78	77
Total noninterest expenses	436	404	895	810
Income before income taxes	199	221	394	424
Provision for income taxes	64	70	125	134
Net Income	135	151	269	290
Less income allocated to participating securities	1	2	3	4
Net income attributable to common shares	$ 134	$ 149	$ 266	$ 286
Basic earnings per common share	$ 0.76	$ 0.83	$ 1.51	$ 1.59
Diluted earnings per common share	$ 0.73	$ 0.80	$ 1.46	$ 1.54
Comprehensive income	$ 109	$ 172	$ 285	$ 377
Cash dividends declared on common stock	$ 37	$ 36	$ 73	$ 71
Cash dividends declared per common share	$ 0.21	$ 0.20	$ 0.41	$ 0.39

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Derivative And Credit-Related Financial Instruments

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative And Credit-Related Financial Instruments

DERIVATIVE AND CREDIT-RELATED FINANCIAL INSTRUMENTS

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

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

Credit risk is the possible loss that may occur in the event of nonperformance by the counterparty to a financial instrument. The Corporation attempts to minimize credit risk arising from customer-initiated derivatives by evaluating the creditworthiness of each customer, adhering to the same credit approval process used for traditional lending activities and obtaining collateral as deemed necessary. Derivatives with dealer counterparties are either cleared through a clearinghouse or settled directly with a single counterparty. For derivatives settled directly with dealer counterparties, the Corporation utilizes counterparty risk limits and monitoring procedures as well as master netting arrangements and bilateral collateral agreements to facilitate the management of credit risk. Master netting arrangements effectively reduce credit risk by permitting settlement of positive and negative positions and offset cash collateral held with the same counterparty on a net basis. Bilateral collateral agreements require daily exchange of cash or highly rated securities issued by the U.S. Treasury or other U.S. government entities to collateralize amounts due to either party beyond certain risk limits. At June 30, 2015, counterparties with bilateral collateral agreements had pledged $128 million of marketable investment securities and deposited $254 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had 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. At June 30, 2015, the Corporation had no derivative instruments with credit-risk-related contingent features that were in a liability position.

Derivative Instruments

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

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

The following table presents the composition of the Corporation’s derivative instruments held or issued for risk management purposes or in connection with customer-initiated and other activities at June 30, 2015 and December 31, 2014. 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.

	June 30, 2015								December 31, 2014
			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	$	2,000	$	148		$	2		$	1,800	$	175		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	657		—			2			508		4			—
Total risk management purposes	2,657		148			4			2,308		179			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	312		—			1			274		—			—
Caps and floors purchased	312		1			—			274		—			—
Swaps	11,807		135			87			11,780		153			102
Total interest rate contracts	12,431		136			88			12,328		153			102
Energy contracts:
Caps and floors written	939		1			92			1,218		—			173
Caps and floors purchased	939		92			1			1,218		173			—
Swaps	2,307		256			255			2,496		354			352
Total energy contracts	4,185		349			348			4,932		527			525
Foreign exchange contracts:
Spot, forwards, options and swaps	2,112		36			29			1,994		35			34
Total customer-initiated and other activities	18,728		521			465			19,254		715			661
Total gross derivatives	$	21,385	669			469			$	21,562	894			661
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(116		)	(116		)			(133		)	(133		)
Netting adjustment - Cash collateral received/posted			(201		)	(3		)			(262		)	—
Net derivatives included in the consolidated balance sheets (b)			352			350					499			528
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(122		)	—					(239		)	(2		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	230		$	350				$	260		$	526

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

(b) Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $4 million and $2 million at June 30, 2015 and December 31, 2014, 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.

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 $16 million and $18 million for the three months ended June 30, 2015 and 2014, respectively, and $34 million and $36 million for the six months ended June 30, 2015 and 2014, respectively. The Corporation recognized $2 million and an insignificant amount of net losses for the three months ended June 30, 2015 and 2014, respectively, and $1 million and an insignificant amount of net losses for the six months ended June 30, 2015 and 2014, respectively, 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.

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 losses on risk management derivative instruments used as economic hedges in "other noninterest income" in the consolidated statements of comprehensive income for each of the three- and six-month periods ended June 30, 2015 and 2014.

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 June 30, 2015 and December 31, 2014.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
June 30, 2015
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	2,000	5.0	3.99	%	0.76	%
December 31, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,800		4.6	4.54		0.49

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at June 30, 2015 and December 31, 2014.

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

Customer-Initiated and Other

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

For customer-initiated foreign exchange contracts where offsetting positions have not been taken, the Corporation manages the remaining inherent market risk through individual foreign currency position limits and aggregate value-at-risk limits. These limits are established annually and reviewed quarterly. For those customer-initiated derivative contracts which were not offset or where the Corporation holds a speculative position within the limits described above, the Corporation recognized $1 million of net gains in “other noninterest income” in the consolidated statements of comprehensive income for the three- and six-month periods ended June 30, 2015 and an insignificant amount for the three- and six-month periods ended June 30, 2014.

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 June 30,				Six Months Ended June 30,
(in millions)	Location of Gain	2015		2014		2015		2014
Interest rate contracts	Other noninterest income	$	5	$	4	$	7	$	8
Energy contracts	Other noninterest income	—		—		1		—
Foreign exchange contracts	Foreign exchange income	8		11		18		20
Total		$	13	$	15	$	26	$	28

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)	June 30, 2015		December 31, 2014
Unused commitments to extend credit:
Commercial and other	$	26,709	$	27,905
Bankcard, revolving check credit and home equity loan commitments	2,291		2,151
Total unused commitments to extend credit	$	29,000	$	30,056
Standby letters of credit	$	3,765	$	3,880
Commercial letters of credit	80		75
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 June 30, 2015 and December 31, 2014, the allowance for credit losses on lending-related commitments, included in “accrued expenses and other liabilities” on the consolidated balance sheets, was $50 million and $41 million, respectively.

Unused Commitments to Extend Credit

Commitments to extend credit are legally binding agreements to lend to a customer, provided there is no violation of any condition established in the contract. These commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Corporation. Commercial and other unused commitments are primarily variable rate commitments. The allowance for credit losses on lending-related commitments included $33 million and $30 million at June 30, 2015 and December 31, 2014, 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 $292 million and $316 million, respectively, of the $3.8 billion and $4.0 billion standby and commercial letters of credit outstanding at June 30, 2015 and December 31, 2014, 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 $61 million at June 30, 2015, including $44 million in deferred fees and $17 million in the allowance for credit losses on lending-related commitments. At December 31, 2014, the comparable amounts were $55 million, $44 million and $11 million, respectively.

The following table presents a summary of criticized standby and commercial letters of credit at June 30, 2015 and December 31, 2014. The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines.

(dollar amounts in millions)	June 30, 2015			December 31, 2014
Total criticized standby and commercial letters of credit	$	104		$	79
As a percentage of total outstanding standby and commercial letters of credit	2.7		%	2.0		%

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 June 30, 2015 and December 31, 2014, the total notional amount of the credit risk participation agreements was approximately $620 million and $598 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 $8 million and $7 million at June 30, 2015 and December 31, 2014, 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 June 30, 2015, the weighted average remaining maturity of outstanding credit risk participation agreements was 2.5 years.

In 2008, the Corporation sold its remaining ownership of Visa Class B shares and entered into a derivative contract. Under the terms of the derivative contract, the Corporation will compensate the counterparty primarily for dilutive adjustments made to the conversion factor of the Visa Class B shares to Class A shares based on the ultimate outcome of litigation involving Visa. Conversely, the Corporation will be compensated by the counterparty for any increase in the conversion factor from anti-dilutive adjustments. The notional amount of the derivative contract was equivalent to approximately 780,000 Visa Class B shares. The fair value of the derivative liability, included in "accrued expenses and other liabilities" on the consolidated balance sheets, was $1 million at both June 30, 2015 and December 31, 2014, respectively.

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Credit Quality And Allowance For Credit Losses

6 Months Ended

Jun. 30, 2015

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		Total  Loans
June 30, 2015
Business loans:
Commercial	$	45	$	3	$	7	$	55	$	186	$	32,482	$	32,723
Real estate construction:
Commercial Real Estate business line (a)	2		—		—		2		—		1,500		1,502
Other business lines (b)	—		—		8		8		1		284		293
Total real estate construction	2		—		8		10		1		1,784		1,795
Commercial mortgage:
Commercial Real Estate business line (a)	3		—		—		3		18		1,907		1,928
Other business lines (b)	14		5		2		21		59		6,666		6,746
Total commercial mortgage	17		5		2		24		77		8,573		8,674
Lease financing	—		—		—		—		11		775		786
International	4		3		—		7		9		1,404		1,420
Total business loans	68		11		17		96		284		45,018		45,398
Retail loans:
Residential mortgage	33		1		—		34		35		1,796		1,865
Consumer:
Home equity	4		2		1		7		29		1,646		1,682
Other consumer	2		—		—		2		1		793		796
Total consumer	6		2		1		9		30		2,439		2,478
Total retail loans	39		3		1		43		65		4,235		4,343
Total loans	$	107	$	14	$	18	$	139	$	349	$	49,253	$	49,741
December 31, 2014
Business loans:
Commercial	$	58	$	13	$	1	$	72	$	109	$	31,339	$	31,520
Real estate construction:
Commercial Real Estate business line (a)	3		—		—		3		1		1,602		1,606
Other business lines (b)	12		—		—		12		1		336		349
Total real estate construction	15		—		—		15		2		1,938		1,955
Commercial mortgage:
Commercial Real Estate business line (a)	8		1		1		10		22		1,758		1,790
Other business lines (b)	16		12		2		30		73		6,711		6,814
Total commercial mortgage	24		13		3		40		95		8,469		8,604
Lease financing	—		—		—		—		—		805		805
International	9		—		—		9		—		1,487		1,496
Total business loans	106		26		4		136		206		44,038		44,380
Retail loans:
Residential mortgage	9		2		—		11		36		1,784		1,831
Consumer:
Home equity	5		3		—		8		30		1,620		1,658
Other consumer	12		—		1		13		1		710		724
Total consumer	17		3		1		21		31		2,330		2,382
Total retail loans	26		5		1		32		67		4,114		4,213
Total loans	$	132	$	31	$	5	$	168	$	273	$	48,152	$	48,593

(a) Primarily loans to real estate developers.

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

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
June 30, 2015
Business loans:
Commercial	$	31,046	$	710	$	781	$	186	$	32,723
Real estate construction:
Commercial Real Estate business line (e)	1,490		12		—		—		1,502
Other business lines (f)	284		—		8		1		293
Total real estate construction	1,774		12		8		1		1,795
Commercial mortgage:
Commercial Real Estate business line (e)	1,818		59		33		18		1,928
Other business lines (f)	6,385		170		132		59		6,746
Total commercial mortgage	8,203		229		165		77		8,674
Lease financing	752		17		6		11		786
International	1,362		24		25		9		1,420
Total business loans	43,137		992		985		284		45,398
Retail loans:
Residential mortgage	1,815		2		13		35		1,865
Consumer:
Home equity	1,647		1		5		29		1,682
Other consumer	781		3		11		1		796
Total consumer	2,428		4		16		30		2,478
Total retail loans	4,243		6		29		65		4,343
Total loans	$	47,380	$	998	$	1,014	$	349	$	49,741
December 31, 2014
Business loans:
Commercial	$	30,310	$	560	$	541	$	109	$	31,520
Real estate construction:
Commercial Real Estate business line (e)	1,594		11		—		1		1,606
Other business lines (f)	336		7		5		1		349
Total real estate construction	1,930		18		5		2		1,955
Commercial mortgage:
Commercial Real Estate business line (e)	1,652		69		47		22		1,790
Other business lines (f)	6,434		138		169		73		6,814
Total commercial mortgage	8,086		207		216		95		8,604
Lease financing	778		26		1		—		805
International	1,468		15		13		—		1,496
Total business loans	42,572		826		776		206		44,380
Retail loans:
Residential mortgage	1,790		2		3		36		1,831
Consumer:
Home equity	1,620		—		8		30		1,658
Other consumer	718		3		2		1		724
Total consumer	2,338		3		10		31		2,382
Total retail loans	4,128		5		13		67		4,213
Total loans	$	46,700	$	831	$	789	$	273	$	48,593

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

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

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

(d) Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-55 in the Corporation's 2014 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.

(e) Primarily loans to real estate developers.

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

The following table summarizes nonperforming assets.

(in millions)	June 30, 2015		December 31, 2014
Nonaccrual loans	$	349	$	273
Reduced-rate loans (a)	12		17
Total nonperforming loans	361		290
Foreclosed property (b)	9		10
Total nonperforming assets	$	370	$	300

(a) Reduced-rate business loans were zero at both June 30, 2015 and December 31, 2014, and reduced-rate retail loans were $12 million and $17 million at June 30, 2015 and December 31, 2014, respectively.

(b) Foreclosed residential real estate properties.

Nonaccrual loans included retail loans secured by residential real estate properties in process of foreclosure of $1 million at June 30, 2015.

Allowance for Credit Losses

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

	2015									2014
(in millions)	Business Loans			Retail Loans			Total			Business Loans			Retail Loans			Total
Three Months Ended June 30
Allowance for loan losses:
Balance at beginning of period	$	541		$	60		$	601		$	530		$	64		$	594
Loan charge-offs	(31		)	(4		)	(35		)	(24		)	(4		)	(28		)
Recoveries on loans previously charged-off	16			1			17			15			4			19
Net loan charge-offs	(15		)	(3		)	(18		)	(9		)	—			(9		)
Provision for loan losses	37			(2		)	35			7			(1		)	6
Balance at end of period	$	563		$	55		$	618		$	528		$	63		$	591
Six Months Ended June 30
Allowance for loan losses:
Balance at beginning of period	$	534		$	60		$	594		$	531		$	67		$	598
Loan charge-offs	(52		)	(6		)	(58		)	(51		)	(7		)	(58		)
Recoveries on loans previously charged-off	28			4			32			31			6			37
Net loan charge-offs	(24		)	(2		)	(26		)	(20		)	(1		)	(21		)
Provision for loan losses	54			(3		)	51			17			(3		)	14
Foreign currency translation adjustment	(1		)	—			(1		)	—			—			—
Balance at end of period	$	563		$	55		$	618		$	528		$	63		$	591
As a percentage of total loans	1.24		%	1.27		%	1.24		%	1.21		%	1.55		%	1.23		%
June 30
Allowance for loan losses:
Individually evaluated for impairment	$	39		$	—		$	39		$	39		$	—		$	39
Collectively evaluated for impairment	524			55			579			489			63			552
Total allowance for loan losses	$	563		$	55		$	618		$	528		$	63		$	591
Loans:
Individually evaluated for impairment	$	258		$	34		$	292		$	215		$	45		$	260
Collectively evaluated for impairment	45,140			4,307			49,447			43,631			3,988			47,619
Purchased credit impaired (PCI) loans	—			2			2			—			3			3
Total loans evaluated for impairment	$	45,398		$	4,343		$	49,741		$	43,846		$	4,036		$	47,882

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 June 30,					Six Months Ended June 30,
(in millions)	2015			2014		2015			2014
Balance at beginning of period	$	39		$	37	$	41		$	36
Charge-offs on lending related commitments (a)	(1		)	—		(1		)	—
Provision for credit losses on lending-related commitments	12			5		10			6
Balance at end of period	$	50		$	42	$	50		$	42

(a)    Charge-offs result from the sale of unfunded lending-related commitments.

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
June 30, 2015
Business loans:
Commercial	$	27	$	168	$	195	$	239	$	30
Real estate construction:
Other business lines (a)	—		1		1		1		—
Commercial mortgage:
Commercial Real Estate business line (b)	7		8		15		37		6
Other business lines (a)	2		36		38		55		1
Total commercial mortgage	9		44		53		92		7
International	—		9		9		16		2
Total business loans	36		222		258		348		39
Retail loans:
Residential mortgage	15		—		15		17		—
Consumer:
Home equity	12		—		12		15		—
Other consumer	7		—		7		11		—
Total consumer	19		—		19		26		—
Total retail loans (c)	34		—		34		43		—
Total individually evaluated impaired loans	$	70	$	222	$	292	$	391	$	39
December 31, 2014
Business loans:
Commercial	$	7	$	103	$	110	$	148	$	29
Real estate construction:
Other business lines (a)	—		1		1		1		—
Commercial mortgage:
Commercial Real Estate business line (b)	—		19		19		41		8
Other business lines (a)	4		43		47		63		2
Total commercial mortgage	4		62		66		104		10
Total business loans	11		166		177		253		39
Retail loans:
Residential mortgage	25		—		25		28		—
Consumer:
Home equity	12		—		12		16		—
Other consumer	5		—		5		7		—
Total consumer	17		—		17		23		—
Total retail loans (c)	42		—		42		51		—
Total individually evaluated impaired loans	$	53	$	166	$	219	$	304	$	39

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

(b) Primarily loans to real estate developers.

(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 performing restructured loans.

	Individually Evaluated Impaired Loans
	2015				2014
(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 June 30
Business loans:
Commercial	$	152	$	1	$	56	$	—
Real estate construction:
Commercial Real Estate business line (a)	—		—		17		—
Commercial mortgage:
Commercial Real Estate business line (a)	16		—		63		—
Other business lines (b)	40		—		71		1
Total commercial mortgage	56		—		134		1
International	5		—		2		—
Total business loans	213		1		209		1
Retail loans:
Residential mortgage	19		—		31		—
Consumer loans:
Home equity	12		—		12		—
Other consumer	5		—		4		—
Total consumer	17		—		16		—
Total retail loans	36		—		47		—
Total individually evaluated impaired loans	$	249	$	1	$	256	$	1
Six Months Ended June 30
Business loans:
Commercial	$	138	$	2	$	62	$	—
Real estate construction:
Commercial Real Estate business line (a)	—		—		18		—
Commercial mortgage:
Commercial Real Estate business line (a)	17		—		62		—
Other business lines (b)	42		—		70		2
Total commercial mortgage	59		—		132		2
International	3		—		2		—
Total business loans	200		2		214		2
Retail loans:
Residential mortgage	21		—		32		—
Consumer:
Home equity	12		—		12		—
Other consumer	5		—		4		—
Total consumer	17		—		16		—
Total retail loans	38		—		48		—
Total individually evaluated impaired loans	$	238	$	2	$	262	$	2

(a) Primarily loans to real estate developers.

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

Troubled Debt Restructurings

The following tables detail the recorded balance at June 30, 2015 and 2014 of loans considered to be TDRs that were restructured during the three- and six-month periods ended June 30, 2015 and 2014, 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.

	2015						2014
	Type of Modification						Type of Modification
(in millions)	Principal Deferrals (a)		Interest Rate Reductions		Total Modifications		Principal Deferrals (a)		Interest Rate Reductions		Total Modifications
Three Months Ended June 30
Business loans:
Commercial	$	2	$	—	$	2	$	—	$	—	$	—
Commercial mortgage:
Commercial Real Estate business line (b)	1		—		1		—		—		—
Other business lines (c)	1		—		1		—		—		—
Total commercial mortgage	2		—		2		—		—		—
Total business loans	4		—		4		—		—		—
Retail loans:
Consumer:
Home equity	—		1		1		—		1		1
Total loans	$	4	$	1	$	5	$	—	$	1	$	1
Six Months Ended June 30
Business loans:
Commercial	$	2	$	—	$	2	$	1	$	—	$	1
Commercial mortgage:
Commercial Real Estate business line (b)	1		—		1		—		—		—
Other business lines (c)	4		—		4		8		—		8
Total commercial mortgage	5		—		5		8		—		8
International	—		—		—		1		—		1
Total business loans	7		—		7		10		—		10
Retail loans:
Consumer:
Home equity	—		1		1		—		2		2
Total loans	$	7	$	1	$	8	$	10	$	2	$	12

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

(b) Primarily loans to real estate developers.

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

Commitments to lend additional funds to borrowers whose terms have been modified in TDRs were insignificant at June 30, 2015 and $3 million at December 31, 2014.

The majority of the modifications considered to be TDRs that occurred during the six months ended June 30, 2015 and 2014 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 six months ended June 30, 2015 and 2014 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 June 30, 2015 and 2014 of loans modified by principal deferral during the twelve-month periods ended June 30, 2015 and 2014, and those principal deferrals which experienced a subsequent default during the three- and six-month periods ended June 30, 2015 and 2014. 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.

	2015							2014
(in millions)	Balance at June 30			Subsequent Default in the Three Months Ended June 30		Subsequent Default in the Six Months Ended June 30		Balance at June 30			Subsequent Default in the Three Months Ended June 30		Subsequent Default in the Six Months Ended June 30
Principal deferrals:
Business loans:
Commercial	$	10		$	—	$	6	$	12		$	—	$	2
Commercial mortgage:
Commercial Real Estate business line (a)	1			—		—		17			—		—
Other business lines (b)	10			1		2		11			—		—
Total commercial mortgage	11			1		2		28			—		—
International	—			—		—		1			—		—
Total business loans	21			1		8		41			—		2
Retail loans:
Residential mortgage	—			—		—		2		(c)	—		—
Consumer:
Home equity	2		(c)	—		—		4		(c)	—		—
Other consumer	—			—		—		1		(c)	—		—
Total consumer	2			—		—		5			—		—
Total retail loans	2			—		—		7			—		—
Total principal deferrals	$	23		$	1	$	8	$	48		$	—	$	2

(a) Primarily loans to real estate developers.

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

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

During the twelve-month periods ended June 30, 2015 and 2014, loans with a carrying value of $2 million and $5 million, respectively, were modified by interest rate reduction. 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. There were no subsequent payment defaults of reduced-rate loans during the three- and six-month periods ended June 30, 2015 and 2014.

Purchased Credit-Impaired Loans

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

No allowance for loan losses was required on the acquired PCI loan pools at both June 30, 2015 and December 31, 2014. The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at June 30, 2015 and December 31, 2014 were as follows.

(in millions)	June 30, 2015		December 31, 2014
Acquired PCI loans:
Carrying amount	$	2	$	2
Outstanding balance (principal and unpaid interest)	6		8

Changes in the accretable yield for acquired PCI loans for the three- and six-month periods ended June 30, 2015 and 2014 were as follows.

	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)	2015		2014			2015			2014
Balance at beginning of period	$	1	$	11		$	1		$	15
Reclassifications from nonaccretable	—		4			1			9
Accretion	—		(9		)	(1		)	(18		)
Balance at end of period	$	1	$	6		$	1		$	6

XML

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

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 June 30, 2015 and December 31, 2014.

(in millions)	Total		Level 1		Level 2		Level 3
June 30, 2015
Trading securities:
Deferred compensation plan assets	$	94	$	94	$	—	$	—
Equity and other non-debt securities	1		1		—		—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	732		732		—		—
Residential mortgage-backed securities (a)	7,262		—		7,262		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	47		—		46		1		(b)
Equity and other non-debt securities	203		132		—		71		(b)
Total investment securities available-for-sale	8,267		864		7,308		95
Derivative assets:
Interest rate contracts	284		—		282		2
Energy derivative contracts	349		—		349		—
Foreign exchange contracts	36		—		36		—
Warrants	3		—		—		3
Total derivative assets	672		—		667		5
Total assets at fair value	$	9,034	$	959	$	7,975	$	100
Derivative liabilities:
Interest rate contracts	$	90	$	—	$	90	$	—
Energy derivative contracts	348		—		348		—
Foreign exchange contracts	31		—		31		—
Other	1		—		—		1
Total derivative liabilities	470		—		469		1
Deferred compensation plan liabilities	94		94		—		—
Total liabilities at fair value	$	564	$	94	$	469	$	1

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

(b) Auction-rate securities.

(in millions)	Total		Level 1		Level 2		Level 3
December 31, 2014
Trading securities:
Deferred compensation plan assets	$	94	$	94	$	—	$	—
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	526		526		—		—
Residential mortgage-backed securities (a)	7,274		—		7,274		—
State and municipal securities	23		—		—		23		(b)
Corporate debt securities	51		—		50		1		(b)
Equity and other non-debt securities	242		130		—		112		(b)
Total investment securities available-for-sale	8,116		656		7,324		136
Derivative assets:
Interest rate contracts	328		—		328		—
Energy derivative contracts	527		—		527		—
Foreign exchange contracts	39		—		39		—
Warrants	4		—		—		4
Total derivative assets	898		—		894		4
Total assets at fair value	$	9,108	$	750	$	8,218	$	140
Derivative liabilities:
Interest rate contracts	$	102	$	—	$	102	$	—
Energy derivative contracts	525		—		525		—
Foreign exchange contracts	34		—		34		—
Other	1		—		—		1
Total derivative liabilities	662		—		661		1
Deferred compensation plan liabilities	94		94		—		—
Total liabilities at fair value	$	756	$	94	$	661	$	1

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

(b) Auction-rate securities.

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

The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three- and six-month periods ended June 30, 2015 and 2014.

			Net Realized/Unrealized Gains (Losses) (Pretax)
	Balance  at Beginning of Period		Recorded in Earnings								Recorded in Other Comprehensive Income						Balance  at End of  Period
(in millions)			Realized				Unrealized							Sales
Three Months Ended June 30, 2015
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	71		—				—				—			—			71
Total investment securities available-for-sale	95		—				—				—			—			95
Derivative assets:
Interest rate contracts	11		—				(9		)	(d)	—			—			2
Warrants	3		1			(d)	—				—			(1		)	3
Derivative liabilities:
Other	1		—				—				—			—			1
Three Months Ended June 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	118		—				—				1		(b)	(1		)	118
Total investment securities available-for-sale	142		—				—				1		(b)	(1		)	142
Derivative assets:
Warrants	3		4			(d)	—				—			(3		)	4
Derivative liabilities:
Other	2		—				—				—			—			2
Six Months Ended June 30, 2015
Investment securities available-for-sale:
State and municipal securities (a)	$	23	$	—			$	—			$	—		$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	112		(2		)	(c)	—				1		(b)	(40		)	71
Total investment securities available-for-sale	136		(2		)	(c)	—				1		(b)	(40		)	95
Derivative assets:
Interest rate contracts	—		—				2			(d)	—			—			2
Warrants	4		1			(d)	(1		)	(d)	—			(1		)	3
Derivative liabilities:
Other	1		—				—				—			—			1
Six Months Ended June 30, 2014
Investment securities available-for-sale:
State and municipal securities (a)	$	22	$	—			$	—			$	1	(b)	$	—		$	23
Corporate debt securities (a)	1		—				—				—			—			1
Equity and other non-debt securities (a)	136		1			(c)	—				6		(b)	(25		)	118
Total investment securities available-for-sale	159		1			(c)	—				7		(b)	(25		)	142
Derivative assets:
Warrants	3		4			(d)	1			(d)	—			(4		)	4
Derivative liabilities:
Other	2		—				—				—			—			2

(a) Auction-rate securities.

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

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

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

Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis

All assets recorded at fair value on a nonrecurring basis were classified as Level 3 at June 30, 2015 and December 31, 2014 and are presented in the following table. No liabilities were recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014.

(in millions)	Level 3
June 30, 2015
Loans:
Commercial	$	18
Commercial mortgage	12
International	8
Total loans	38
Nonmarketable equity securities	1
Other real estate	4
Total assets at fair value	$	43
December 31, 2014
Loans:
Commercial	$	38
Commercial mortgage	26
Total loans	64
Nonmarketable equity securities	2
Other real estate	2
Total assets at fair value	$	68

Quantitative Information About Level 3 Measurements

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

			Discounted Cash Flow Model
			Unobservable Input
	Fair Value (in millions)		Discount Rate	Workout Period (in years)
June 30, 2015
State and municipal securities (a)	$	23	3% - 8%	1 - 2
Equity and other non-debt securities (a)	71		4% - 8%	1
December 31, 2014
State and municipal securities (a)	$	23	3% - 9%	1 - 3
Equity and other non-debt securities (a)	112		4% - 8%	1 - 2

(a) Auction-rate securities.

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

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

	Carrying Amount			Estimated Fair Value
(in millions)				Total			Level 1		Level 2		Level 3
June 30, 2015
Assets
Cash and due from banks	$	1,148		$	1,148		$	1,148	$	—	$	—
Interest-bearing deposits with banks	4,817			4,817			4,817		—		—
Investment securities held-to-maturity	1,952			1,946			—		1,946		—
Loans held-for-sale	25			25			—		25		—
Total loans, net of allowance for loan losses (a)	49,123			49,009			—		—		49,009
Customers’ liability on acceptances outstanding	8			8			8		—		—
Nonmarketable equity securities (b)	11			18			—		—		18
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	28,167			28,167			—		28,167		—
Interest-bearing deposits	25,726			25,726			—		25,726		—
Customer certificates of deposit	4,367			4,357			—		4,357		—
Total deposits	58,260			58,250			—		58,250		—
Short-term borrowings	56			56			56		—		—
Acceptances outstanding	8			8			8		—		—
Medium- and long-term debt	2,841			2,835			—		2,835		—
Credit-related financial instruments	(95		)	(95		)	—		—		(95		)
December 31, 2014
Assets
Cash and due from banks	$	1,026		$	1,026		$	1,026	$	—	$	—
Interest-bearing deposits with banks	5,045			5,045			5,045		—		—
Investment securities held-to-maturity	1,935			1,933			—		1,933		—
Loans held-for-sale	5			5			—		5		—
Total loans, net of allowance for loan losses (a)	47,999			47,932			—		—		47,932
Customers’ liability on acceptances outstanding	10			10			10		—		—
Nonmarketable equity securities (b)	11			18			—		—		18
Restricted equity investments	92			92			92		—		—
Liabilities
Demand deposits (noninterest-bearing)	27,224			27,224			—		27,224		—
Interest-bearing deposits	25,841			25,841			—		25,841		—
Customer certificates of deposit	4,421			4,411			—		4,411		—
Total deposits	57,486			57,476			—		57,476		—
Short-term borrowings	116			116			116		—		—
Acceptances outstanding	10			10			10		—		—
Medium- and long-term debt	2,675			2,681			—		2,681		—
Credit-related financial instruments	(85		)	(85		)	—		—		(85		)

(a) Included $38 million and $64 million of impaired loans recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014, respectively.

(b) Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at June 30, 2015 and December 31, 2014, respectively.

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Contingent Liabilities

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Contingent Liabilities

CONTINGENT LIABILITIES

Legal Proceedings

As previously reported in the Corporation's Form 10-K for the year ended December 31, 2014 and Form 10-Q for the period ended March 31, 2015, Comerica Bank, a wholly owned subsidiary of the Corporation, was named in November 2011 as a third-party defendant in Butte Local Development v. Masters Group v. Comerica Bank (“the case”), for lender liability. The case was tried in January 2014, in the Montana Second District Judicial Court for Silver Bow County in Butte, Montana. On January 17, 2014, a jury awarded Masters $52 million against the Bank. On July 1, 2015, after an appeal filed by the Corporation, the Montana Supreme Court ("the court") reversed the judgment against the Corporation and remanded the case for a new trial with instructions that Michigan law should apply. The court also reversed punitive and consequential damages previously awarded by the jury. Masters subsequently petitioned the court for rehearing, asking the court to affirm the economic damages portion of the jury verdict (approximately $25 million). The Corporation believes it has meritorious defenses to the remaining claims in this case and intends to continue to defend itself vigorously.

The Corporation and certain of its subsidiaries are subject to various other pending or threatened legal proceedings arising out of the normal course of business or operations. The Corporation believes it has meritorious defenses to the claims asserted against it in its other currently outstanding legal proceedings and, with respect to such legal proceedings, intends to continue to defend itself vigorously, litigating or settling cases according to management’s judgment as to what is in the best interests of the Corporation and its shareholders. Settlement may result from the Corporation's determination that it may be more prudent financially to settle, rather than litigate, and should not be regarded as an admission of liability. On at least a quarterly basis, the Corporation assesses its potential liabilities and contingencies in connection with outstanding legal proceedings utilizing the latest information available. On a case-by-case basis, reserves are established for those legal claims for which it is probable that a loss will be incurred either as a result of a settlement or judgment, and the amount of such loss can be reasonably estimated. The actual costs of resolving these claims may be substantially higher or lower than the amounts reserved. Based on current knowledge, and after consultation with legal counsel, management believes that current reserves are adequate, and the amount of any incremental liability arising from these matters is not expected to have a material adverse effect on the Corporation’s consolidated financial condition, consolidated results of operations or consolidated cash flows. Legal fees of $5 million were included in "other noninterest expenses" on the consolidated statements of income for both the three-month periods ended June 30, 2015 and 2014 and $10 million for both the six-month periods ended June 30, 2015 and 2014.

For matters where a loss is not probable, the Corporation has not established legal reserves. The Corporation believes the estimate of the aggregate range of reasonably possible losses, in excess of reserves established, for all legal proceedings in which it is involved is from zero to approximately $43 million at June 30, 2015. This estimated aggregate range of reasonably possible losses is based upon currently available information for those proceedings in which the Corporation is involved, taking into account the Corporation’s best estimate of such losses for those cases for which such estimate can be made. For certain cases, the Corporation does not believe that an estimate can currently be made. The Corporation’s estimate involves significant judgment, given the varying stages of the proceedings (including the fact that many are currently in preliminary stages), the existence in certain proceedings of multiple defendants (including the Corporation) whose share of liability has yet to be determined, the numerous yet-unresolved issues in many of the proceedings (including issues regarding class certification and the scope of many of the claims) and the attendant uncertainty of the various potential outcomes of such proceedings. Accordingly, the Corporation’s estimate will change from time to time, and actual losses may be more or less than the current estimate.

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

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

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Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2015

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

Accumulated Other Comprehensive Loss

ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the six months ended June 30, 2015 and 2014, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).

	Six Months Ended June 30,
(in millions)	2015			2014
Accumulated net unrealized gains (losses) on investment securities:
Balance at beginning of period, net of tax	$	37		$	(68	)
Net unrealized holding (losses) gains arising during the period	(17		)	116
Less: (Benefit) provision for income taxes	(6		)	41
Net unrealized holding (losses) gains arising during the period, net of tax	(11		)	75
Less:
Net realized (losses) gains included in net securities (losses) gains	(2		)	1
Less: Benefit for income taxes	(1		)	—
Reclassification adjustment for net securities (losses) gains included in net income, net of tax	(1		)	1
Less:
Net losses realized as a yield adjustment in interest on investment securities	(4		)	—
Less: Benefit for income taxes	(1		)	—
Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax	(3		)	—
Change in net unrealized (losses) gains on investment securities, net of tax	(7		)	74
Balance at end of period, net of tax	$	30		$	6
Accumulated defined benefit pension and other postretirement plans adjustment:
Balance at beginning of period, net of tax	$	(449	)	$	(323	)
Amortization of actuarial net loss	35			18
Amortization of prior service cost	—			1
Amounts recognized in salaries and benefits expense	35			19
Less: Provision for income taxes	12			6
Change in defined benefit pension and other postretirement plans adjustment, net of tax	23			13
Balance at end of period, net of tax	$	(426	)	$	(310	)
Total accumulated other comprehensive loss at end of period, net of tax	$	(396	)	$	(304	)

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Derivative And Credit-Related Financial Instruments (Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives) (Details) - Not Designated as Hedging Instrument - Customer-Initiated And Other Activities - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net derivative gain recognized in income	$ 13	$ 15	$ 26	$ 28
Interest Rate Contracts | Other Noninterest Income
Net derivative gain recognized in income	5	4	7	8
Energy Contracts | Other Noninterest Income
Net derivative gain recognized in income	0	0	1	0
Foreign Exchange Contracts | Foreign Exchange Income
Net derivative gain recognized in income	$ 8	$ 11	$ 18	$ 20

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Variable Interest Entities (VIEs)

6 Months Ended

Jun. 30, 2015

Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]

Variable Interest Entities (VIEs)

VARIABLE INTEREST ENTITIES (VIEs)

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

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

The Corporation accounts for its interests in LIHTC entities using the proportional amortization method. Exposure to loss as a result of the Corporation’s involvement with LIHTC entities at June 30, 2015 was limited to approximately $389 million. Ownership interests in other community development projects which generate similar tax credits to investors (other tax credit entities) are accounted for under either the cost or equity method. Exposure to loss as a result of the Corporation's involvement in other tax credit entities at June 30, 2015 was limited to approximately $10 million.

Investment balances, including all legally binding commitments to fund future investments, are included in “accrued income and other assets” on the consolidated balance sheets. A liability is recognized in “accrued expenses and other liabilities” on the consolidated balance sheets for all legally binding unfunded commitments to fund tax credit entities ($130 million at June 30, 2015). Amortization and other write-downs of LIHTC investments are presented on a net basis as a component of the "provision for income taxes" on the consolidated statements of comprehensive income, while amortization and write-downs of other tax credit investments are recorded in “other noninterest income." The income tax credits and deductions are recorded as a reduction of income tax expense and a reduction of federal income taxes payable.

The Corporation provided no financial or other support that was not contractually required to any of the above VIEs during the six months ended June 30, 2015 and 2014.

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

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Other noninterest income:
Amortization of other tax credit investments	$	—		$	(1	)	$	1		$	(3	)
Provision for income taxes:
Amortization of LIHTC investments	15			14			30			28
Low income housing tax credits	(15		)	(14		)	(30		)	(28		)
Other tax benefits related to tax credit entities	(5		)	(7		)	(10		)	(13		)
Total provision for income taxes	$	(5	)	$	(7	)	(10		)	(13		)

For further information on the Corporation’s consolidation policy, see Note 1 to the consolidated financial statements in the Corporation's 2014 Annual Report.

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Medium- And Long-Term Debt

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Medium- And Long-Term Debt

MEDIUM- AND LONG-TERM DEBT

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

(in millions)	June 30, 2015		December 31, 2014
Parent company
Subordinated notes:
4.80% subordinated notes due 2015 (a)	$	—	$	304
3.80% subordinated notes due 2026 (a)	253		257
Medium-term notes:
3.00% notes due 2015	300		300
2.125% notes due 2019 (a)	350		347
Total parent company	903		1,208
Subsidiaries
Subordinated notes:
5.75% subordinated notes due 2016 (a)	665		670
5.20% subordinated notes due 2017 (a)	541		548
7.875% subordinated notes due 2026 (a)	221		227
Total subordinated notes	1,427		1,445
Medium-term notes:
2.50% notes due 2020 (a)	495		—
Other notes:
6.0% - 6.4% fixed-rate notes due 2020	16		22
Total subsidiaries	1,938		1,467
Total medium- and long-term debt	$	2,841	$	2,675

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

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

Comerica Bank, a wholly-owned subsidiary of the Corporation (the Bank), is a member of the FHLB, which provides short- and long-term funding to its members through advances collateralized by real estate-related assets. Actual borrowing capacity is contingent on the amount of collateral available to be pledged to the FHLB. At June 30, 2015, $14 billion of real estate-related loans were pledged to the FHLB as blanket collateral for potential future borrowings of approximately $6 billion.    

In the second quarter 2015, the Bank issued $500 million of 2.50% medium-term notes due 2020, which were swapped to a floating rate based on six-month LIBOR. Proceeds were used for general corporate purposes.

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Net Income Per Common Share

6 Months Ended

Jun. 30, 2015

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 June 30,				Six Months Ended June 30,
(in millions, except per share data)	2015		2014		2015		2014
Basic and diluted
Net income	$	135	$	151	$	269	$	290
Less:
Income allocated to participating securities	1		2		3		4
Net income attributable to common shares	$	134	$	149	$	266	$	286
Basic average common shares	176		179		176		180
Basic net income per common share	$	0.76	$	0.83	$	1.51	$	1.59
Basic average common shares	176		179		176		180
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	2		2		2		2
Net effect of the assumed exercise of warrants	4		5		4		4
Diluted average common shares	182		186		182		186
Diluted net income per common share	$	0.73	$	0.80	$	1.46	$	1.54

The following average shares related to outstanding options to purchase shares of common stock were not included in the computation of diluted net income per common share because the options were anti-dilutive for the period.

	Three Months Ended June 30,		Six Months Ended June 30,
(shares in millions)	2015	2014	2015	2014
Average outstanding options	5.0	7.2	5.9	7.9
Range of exercise prices	$49.22 - $60.82	$49.22 - $60.82	$46.68 - $60.82	$48.17 - $61.94

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Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Variable Interest Entity
Other noninterest income	$ 26	$ 34	$ 53	$ 63
Provision for income taxes	64	70	125	134
Variable Interest Entity
Variable Interest Entity
Other noninterest income	0	(1)	1	(3)
Provision for income taxes	(5)	(7)	(10)	(13)
Amortization of LIHTC investments | Variable Interest Entity
Variable Interest Entity
Provision for income taxes	15	14	30	28
Low income housing tax credits | Variable Interest Entity
Variable Interest Entity
Provision for income taxes	(15)	(14)	(30)	(28)
Other tax benefits related to tax credit entities | Variable Interest Entity
Variable Interest Entity
Provision for income taxes	$ (5)	$ (7)	$ (10)	$ (13)

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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Debt Instrument [Line Items]
Total medium- and long-term debt		$ 2,841	$ 2,675
Parent Company
Debt Instrument [Line Items]
Total medium- and long-term debt		903	1,208
Subsidiaries
Debt Instrument [Line Items]
Subordinated notes		1,427	1,445
Total medium- and long-term debt		1,938	1,467
4.80% subordinated notes due 2015 | Parent Company
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 0	$ 304
Stated interest rate		4.80%	4.80%
Maturity Date		May 01, 2015	May 01, 2015
3.80% subordinated notes due 2026 | Parent Company
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 253	$ 257
Stated interest rate		3.80%	3.80%
Maturity Date		Jul. 22, 2026	Jul. 22, 2026
3.00% notes due 2015 | Parent Company
Debt Instrument [Line Items]
Medium-term notes		$ 300	$ 300
Stated interest rate		3.00%	3.00%
Maturity Date		Sep. 16, 2015	Sep. 16, 2015
2.125% notes due 2019 | Parent Company
Debt Instrument [Line Items]
Medium-term notes	[1]	$ 350	$ 347
Stated interest rate		2.125%	2.125%
Maturity Date		May 23, 2019	May 23, 2019
5.75% subordinated notes due 2016 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 665	$ 670
Stated interest rate		5.75%	5.75%
Maturity Date		Nov. 21, 2016	Nov. 21, 2016
5.20% subordinated notes due 2017 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 541	$ 548
Stated interest rate		5.20%	5.20%
Maturity Date		Aug. 22, 2017	Aug. 22, 2017
7.875% subordinated notes due 2026 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 221	$ 227
Stated interest rate		7.875%	7.875%
Maturity Date		Sep. 15, 2026	Sep. 15, 2026
2.50% notes due 2020 | Subsidiaries
Debt Instrument [Line Items]
Medium-term notes	[1]	$ 495		$ 0
Stated interest rate	[1]	2.50%
Maturity Date		Jun. 02, 2020
6.0% - 6.4% fixed-rate notes due 2020 | Subsidiaries
Debt Instrument [Line Items]
Other Notes		$ 16	$ 22
Fixed Interest Rate - minimum		6.00%	6.00%
Fixed Interest Rate - maximum		6.40%	6.40%
Maturity Date		Jun. 30, 2020	Jun. 30, 2020

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

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Variable Interest Entities (VIEs) (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Variable Interest Entity
Unfunded commitments to fund tax credit entities	$ 130
Amount of financial or other support not contractually required provided by the Corporation to VIEs	0	$ 0
Low Income Housing Tax Credit Entities
Variable Interest Entity
Exposure to loss as a result of involvement with VIEs	389
Other Tax Credit Entities
Variable Interest Entity
Exposure to loss as a result of involvement with VIEs	$ 10

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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Recurring
Transfers into or out of Level 1 or Level 2 or Level 3	$ 0	$ 0	$ 0	$ 0
Total liabilities at fair value	564		564		$ 756
Nonrecurring
Total liabilities at fair value	$ 0		$ 0		$ 0

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Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		$ 70	$ 53
Recorded investment in impaired loans with related allowance		222	166
Recorded investment total impaired loans		292	219
Unpaid principal balance		391	304
Related allowance for loan losses		39	39
Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		36	11
Recorded investment in impaired loans with related allowance		222	166
Recorded investment total impaired loans		258	177
Unpaid principal balance		348	253
Related allowance for loan losses		39	39
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		27	7
Recorded investment in impaired loans with related allowance		168	103
Recorded investment total impaired loans		195	110
Unpaid principal balance		239	148
Related allowance for loan losses		30	29
Business loans | Real estate construction | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[1]	0	0
Recorded investment in impaired loans with related allowance	[1]	1	1
Recorded investment total impaired loans	[1]	1	1
Unpaid principal balance	[1]	1	1
Related allowance for loan losses	[1]	0	0
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		9	4
Recorded investment in impaired loans with related allowance		44	62
Recorded investment total impaired loans		53	66
Unpaid principal balance		92	104
Related allowance for loan losses		7	10
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[2]	7	0
Recorded investment in impaired loans with related allowance	[2]	8	19
Recorded investment total impaired loans	[2]	15	19
Unpaid principal balance	[2]	37	41
Related allowance for loan losses	[2]	6	8
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[1]	2	4
Recorded investment in impaired loans with related allowance	[1]	36	43
Recorded investment total impaired loans	[1]	38	47
Unpaid principal balance	[1]	55	63
Related allowance for loan losses	[1]	1	2
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		9
Recorded investment total impaired loans		9
Unpaid principal balance		16
Related allowance for loan losses		2
Retail loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[3]	34	42
Recorded investment in impaired loans with related allowance	[3]	0	0
Recorded investment total impaired loans	[3]	34	42
Unpaid principal balance	[3]	43	51
Related allowance for loan losses	[3]	0	0
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		15	25
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		15	25
Unpaid principal balance		17	28
Related allowance for loan losses		0	0
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		19	17
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		19	17
Unpaid principal balance		26	23
Related allowance for loan losses		0	0
Retail loans | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		12	12
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		12	12
Unpaid principal balance		15	16
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		7	5
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		7	5
Unpaid principal balance		11	7
Related allowance for loan losses		$ 0	$ 0

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

[2] Primarily loans to real estate developers.

[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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Subsequent Events

6 Months Ended

Jun. 30, 2015

Subsequent Events [Abstract]

Subsequent Events

SUBSEQUENT EVENTS

On July 22, 2015, the Bank issued $350 million of 4.00% subordinated notes due July 27, 2025 and $175 million of 2.50% senior notes due June 2, 2020. None of the notes are redeemable prior to maturity. Proceeds from both issuances will be used for general corporate purposes.

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Derivative And Credit-Related Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule Of Derivative Instruments

The following table presents the composition of the Corporation’s derivative instruments held or issued for risk management purposes or in connection with customer-initiated and other activities at June 30, 2015 and December 31, 2014. 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.

	June 30, 2015								December 31, 2014
			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	$	2,000	$	148		$	2		$	1,800	$	175		$	—
Derivatives used as economic hedges
Foreign exchange contracts:
Spot, forwards and swaps	657		—			2			508		4			—
Total risk management purposes	2,657		148			4			2,308		179			—
Customer-initiated and other activities
Interest rate contracts:
Caps and floors written	312		—			1			274		—			—
Caps and floors purchased	312		1			—			274		—			—
Swaps	11,807		135			87			11,780		153			102
Total interest rate contracts	12,431		136			88			12,328		153			102
Energy contracts:
Caps and floors written	939		1			92			1,218		—			173
Caps and floors purchased	939		92			1			1,218		173			—
Swaps	2,307		256			255			2,496		354			352
Total energy contracts	4,185		349			348			4,932		527			525
Foreign exchange contracts:
Spot, forwards, options and swaps	2,112		36			29			1,994		35			34
Total customer-initiated and other activities	18,728		521			465			19,254		715			661
Total gross derivatives	$	21,385	669			469			$	21,562	894			661
Amounts offset in the consolidated balance sheets:
Netting adjustment - Offsetting derivative assets/liabilities			(116		)	(116		)			(133		)	(133		)
Netting adjustment - Cash collateral received/posted			(201		)	(3		)			(262		)	—
Net derivatives included in the consolidated balance sheets (b)			352			350					499			528
Amounts not offset in the consolidated balance sheets:
Marketable securities pledged under bilateral collateral agreements			(122		)	—					(239		)	(2		)
Net derivatives after deducting amounts not offset in the consolidated balance sheets			$	230		$	350				$	260		$	526

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

(b) Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $4 million and $2 million at June 30, 2015 and December 31, 2014, 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 June 30, 2015 and December 31, 2014.

			Weighted Average
(dollar amounts in millions)	Notional Amount		Remaining Maturity (in years)	Receive Rate		Pay Rate (a)
June 30, 2015
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	$	2,000	5.0	3.99	%	0.76	%
December 31, 2014
Swaps - fair value - receive fixed/pay floating rate
Medium- and long-term debt designation	1,800		4.6	4.54		0.49

(a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at June 30, 2015 and December 31, 2014.

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 June 30,				Six Months Ended June 30,
(in millions)	Location of Gain	2015		2014		2015		2014
Interest rate contracts	Other noninterest income	$	5	$	4	$	7	$	8
Energy contracts	Other noninterest income	—		—		1		—
Foreign exchange contracts	Foreign exchange income	8		11		18		20
Total		$	13	$	15	$	26	$	28

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)	June 30, 2015		December 31, 2014
Unused commitments to extend credit:
Commercial and other	$	26,709	$	27,905
Bankcard, revolving check credit and home equity loan commitments	2,291		2,151
Total unused commitments to extend credit	$	29,000	$	30,056
Standby letters of credit	$	3,765	$	3,880
Commercial letters of credit	80		75
Other credit-related financial instruments	1		1

Summary Of Criticized Letters Of Credit

The following table presents a summary of criticized standby and commercial letters of credit at June 30, 2015 and December 31, 2014. The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines.

(dollar amounts in millions)	June 30, 2015			December 31, 2014
Total criticized standby and commercial letters of credit	$	104		$	79
As a percentage of total outstanding standby and commercial letters of credit	2.7		%	2.0		%

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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	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses	$ 47	$ 11	$ 61	$ 20
Purchased credit impaired (PCI) loans					$ 2	$ 2
Total loans					49,741	48,593
Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans					45,398	44,380
Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans					$ 4,343	4,213
Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	601	594	594	598
Loan charge-offs	(35)	(28)	(58)	(58)
Recoveries on loans previously charged-off	17	19	32	37
Net loan charge-offs	(18)	(9)	(26)	(21)
Provision for loan losses	35	6	51	14
Foreign currency translation adjustment			(1)	0
Balance at end of period	618	591	618	591
As a percentage of total loans					1.24%		1.23%
Allowance for loan losses individually evaluated for impairment					$ 39		$ 39
Allowance for loan losses collectively evaluated for impairment					579		552
Total allowance for loan losses	601	594	594	598	618	594	591
Loans individually evaluated for impairment					292		260
Loans collectively evaluated for impairment					49,447		47,619
Purchased credit impaired (PCI) loans					2		3
Total loans					$ 49,741		$ 47,882
Financing Receivable [Member] | Business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	541	530	534	531
Loan charge-offs	(31)	(24)	(52)	(51)
Recoveries on loans previously charged-off	16	15	28	31
Net loan charge-offs	(15)	(9)	(24)	(20)
Provision for loan losses	37	7	54	17
Foreign currency translation adjustment			(1)	0
Balance at end of period	563	528	563	528
As a percentage of total loans					1.24%		1.21%
Allowance for loan losses individually evaluated for impairment					$ 39		$ 39
Allowance for loan losses collectively evaluated for impairment					524		489
Total allowance for loan losses	541	530	534	531	563	534	528
Loans individually evaluated for impairment					258		215
Loans collectively evaluated for impairment					45,140		43,631
Purchased credit impaired (PCI) loans					0		0
Total loans					$ 45,398		$ 43,846
Financing Receivable [Member] | Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	60	64	60	67
Loan charge-offs	(4)	(4)	(6)	(7)
Recoveries on loans previously charged-off	1	4	4	6
Net loan charge-offs	(3)	0	(2)	(1)
Provision for loan losses	(2)	(1)	(3)	(3)
Foreign currency translation adjustment			0	0
Balance at end of period	55	63	55	63
As a percentage of total loans					1.27%		1.55%
Allowance for loan losses individually evaluated for impairment					$ 0		$ 0
Allowance for loan losses collectively evaluated for impairment					55		63
Total allowance for loan losses	$ 60	$ 64	$ 60	$ 67	55	$ 60	63
Loans individually evaluated for impairment					34		45
Loans collectively evaluated for impairment					4,307		3,988
Purchased credit impaired (PCI) loans					2		3
Total loans					$ 4,343		$ 4,036

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Investment Securities (Summary Of Investment Securities Available-For-Sale) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Investment securities available-for-sale, Amortized Cost	[1]	$ 8,201	$ 8,035
Investment securities available-for-sale securities, Gross Unrealized Gains	[1]	112	123
Investment securities available-for-sale securities, Gross Unrealized Losses	[1]	46	42
Investment securities available-for-sale, Fair Value	[1]	8,267	8,116
Investment securities held-to-maturity, Amortized Cost		1,952	1,935
Investment securities held-to-maturity, Fair Value		1,946
Net unrealized losses on available-for-sale securities transferred to held-to-maturity		19	23
U.S. Treasury and Other U.S. Government Agency Securities
Investment securities available-for-sale, Amortized Cost		729	526
Investment securities available-for-sale securities, Gross Unrealized Gains		4	0
Investment securities available-for-sale securities, Gross Unrealized Losses		1	0
Investment securities available-for-sale, Fair Value		732	526
Residential Mortgage-Backed Securities
Investment securities available-for-sale, Amortized Cost	[2]	7,200	7,192
Investment securities available-for-sale securities, Gross Unrealized Gains	[2]	106	122
Investment securities available-for-sale securities, Gross Unrealized Losses	[2]	44	40
Investment securities available-for-sale, Fair Value	[2]	7,262	7,274
Investment securities held-to-maturity, Amortized Cost	[2],[3]	1,952	1,935
Investment securities held-to-maturity, Gross Unrealized Gains	[2],[3]	2	0
Investment securities held-to-maturity, Gross Unrealized Losses	[2],[3]	8	2
Investment securities held-to-maturity, Fair Value	[2],[3]	1,946	1,933
State And Municipal Securities
Investment securities available-for-sale, Amortized Cost		24	24
Investment securities available-for-sale securities, Gross Unrealized Gains		0	0
Investment securities available-for-sale securities, Gross Unrealized Losses		1	1
Investment securities available-for-sale, Fair Value		23	23
Corporate Debt Securities
Investment securities available-for-sale, Amortized Cost		47	51
Investment securities available-for-sale securities, Gross Unrealized Gains		0	0
Investment securities available-for-sale securities, Gross Unrealized Losses		0	0
Investment securities available-for-sale, Fair Value		47	51
Equity and Other Non-Debt Securities
Investment securities available-for-sale, Amortized Cost		201	242
Investment securities available-for-sale securities, Gross Unrealized Gains		2	1
Investment securities available-for-sale securities, Gross Unrealized Losses		0	1
Investment securities available-for-sale, Fair Value		203	242
Auction-Rate Securities
Investment securities available-for-sale, Amortized Cost		95	137
Investment securities available-for-sale, Fair Value		$ 95	$ 136

[1] Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

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

[3] The amortized cost of investment securities held-to-maturity included net unrealized losses of $19 million at June 30, 2015 and $23 million at December 31, 2014 related to securities transferred to available-for-sale, which are included in accumulated other comprehensive loss.

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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Capital Surplus	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock
BALANCE at Dec. 31, 2013	$ 7,150	$ 1,141	$ 2,179	$ (391)	$ 6,318	$ (2,097)
BALANCE (in shares) at Dec. 31, 2013		182.3
Net income	290				290
Other comprehensive income, net of tax	87			87
Cash dividends declared on common stock	(71)				(71)
Purchase of common stock	(141)					(141)
Purchase of common stock (in shares)		(3.0)
Net issuance of common stock under employee stock plans	32		(25)		(17)	74
Net issuance of common stock under employee stock plans (in shares)		1.6
Share-based compensation	22		22
Other	0		(1)			1
Other (in shares)		0.0
BALANCE at Jun. 30, 2014	7,369	$ 1,141	2,175	(304)	6,520	(2,163)
BALANCE (in shares) at Jun. 30, 2014		180.9
BALANCE at Dec. 31, 2014	7,402	$ 1,141	2,188	(412)	6,744	(2,259)
BALANCE (in shares) at Dec. 31, 2014		179.0
Net income	269				269
Other comprehensive income, net of tax	16			16
Cash dividends declared on common stock	(73)				(73)
Purchase of common stock	(115)					(115)
Purchase of common stock (in shares)		(2.5)
Purchase and retirement of warrants	(10)		(10)
Net issuance of common stock under employee stock plans	10		(23)		(10)	43
Net issuance of common stock under employee stock plans (in shares)		0.9
Net issuance of common stock for warrants	0		(21)		(22)	43
Net issuance of common stock for warrants (in shares)		1.0
Share-based compensation	24		24
BALANCE at Jun. 30, 2015	$ 7,523	$ 1,141	$ 2,158	$ (396)	$ 6,908	$ (2,288)
BALANCE (in shares) at Jun. 30, 2015		178.4

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Investment Securities

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

INVESTMENT SECURITIES

A summary of the Corporation’s investment securities follows:

(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
June 30, 2015
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	$	729	$	4	$	1	$	732
Residential mortgage-backed securities (a)	7,200		106		44		7,262
State and municipal securities	24		—		1		23
Corporate debt securities	47		—		—		47
Equity and other non-debt securities	201		2		—		203
Total investment securities available-for-sale (b)	$	8,201	$	112	$	46	$	8,267
Investment securities held-to-maturity (c):
Residential mortgage-backed securities (a)	$	1,952	$	2	$	8	$	1,946
December 31, 2014
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	$	526	$	—	$	—	$	526
Residential mortgage-backed securities (a)	7,192		122		40		7,274
State and municipal securities	24		—		1		23
Corporate debt securities	51		—		—		51
Equity and other non-debt securities	242		1		1		242
Total investment securities available-for-sale (b)	$	8,035	$	123	$	42	$	8,116
Investment securities held-to-maturity (c):
Residential mortgage-backed securities (a)	$	1,935	$	—	$	2	$	1,933

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

(b) Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

(c) The amortized cost of investment securities held-to-maturity included net unrealized losses of $19 million at June 30, 2015 and $23 million at December 31, 2014 related to securities transferred to available-for-sale, which are included in accumulated other comprehensive loss.

A summary of the Corporation’s investment securities in an unrealized loss position as of June 30, 2015 and December 31, 2014 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
June 30, 2015
U.S. Treasury and other U.S. government agency securities	$	212	$	1		$	—	$	—		$	212	$	1
Residential mortgage-backed securities (b)	1,637		15			2,188		59			3,825		74
State and municipal securities (c)	—		—			23		1			23		1
Corporate debt securities (c)	—		—			1		—		(a)	1		—		(a)
Total temporarily impaired securities	$	1,849	$	16		$	2,212	$	60		$	4,061	$	76
December 31, 2014
U.S. Treasury and other U.S. government agency securities	$	298	$	—	(a)	$	—	$	—		$	298	$	—	(a)
Residential mortgage-backed securities (b)	626		3			3,112		71			3,738		74
State and municipal securities (c)	—		—			22		1			22		1
Corporate debt securities (c)	—		—			1		—		(a)	1		—		(a)
Equity and other non-debt securities (c)	—		—			112		1			112		1
Total temporarily impaired securities	$	924	$	3		$	3,247	$	73		$	4,171	$	76

(a) Unrealized losses less than $0.5 million.

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

(c) Auction-rate securities.

At June 30, 2015, the Corporation had 112 securities in an unrealized loss position with no credit impairment, including 93 residential mortgage-backed securities, 17 state and municipal auction-rate securities, one corporate auction-rate debt security and one U.S. Treasury security. As of June 30, 2015, approximately 93 percent of the aggregate par value of auction-rate securities have been redeemed or sold since acquisition, of which approximately 92 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 June 30, 2015.

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

	Six Months Ended June 30,
(in millions)	2015			2014
Securities gains	$	—		$	1
Securities losses	(2		)	—
Net securities (losses) gains	$	(2	)	$	1

There were no securities gains or losses for both the three-month periods ended June 30, 2015 and 2014.

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)	Available-for-sale				Held-to-maturity
June 30, 2015	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Contractual maturity
Within one year	$	78	$	78	$	—	$	—
After one year through five years	710		712		—		—
After five years through ten years	883		923		—		—
After ten years	6,329		6,351		1,952		1,946
Subtotal	8,000		8,064		1,952		1,946
Equity and other non-debt securities	201		203
Total investment securities	$	8,201	$	8,267	$	1,952	$	1,946

Included in the contractual maturity distribution in the table above were residential mortgage-backed securities available-for-sale with total amortized cost and fair value of $7.2 billion and $7.3 billion, respectively, and residential mortgage-backed securities held-to-maturity with a total amortized cost and fair value of $2.0 billion and $1.9 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 June 30, 2015, investment securities with a carrying value of $2.8 billion were pledged where permitted or required by law to secure $2.2 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		Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	$ 21,385	$ 21,562
Fair Value of Gross Derivative Assets		669	894
Fair Value of Gross Derivative Liabilities		469	661
Derivative Asset, Netting Adjustment - Offsetting Liabilities		(116)	(133)
Derivative Liability, Netting Adjustment - Offsetting Assets		(116)	(133)
Derivative Asset, Netting Adjustment - Cash Collateral Received		(201)	(262)
Derivative Liability, Netting Adjustment, Cash Collateral Posted		(3)	0
Net Derivative Assets Included in the Consolidated Balance Sheets	[2]	352	499
Net Derivative Liabilities Included in the Consolidated Balance Sheets	[2]	350	528
Derivative Asset, Securities Pledged As Collateral		(122)	(239)
Derivative Liability, Securities Pledged As Collateral		0	(2)
Net Derivative Assets After Deducting Amounts Not Offset in the Consolidated Balance Sheets		230	260
Net Derivative Liabilities After Deducting Amounts Not Offset in the Consolidated Balance Sheets		350	526
Derivative Credit Risk Valuation Adjustment, Derivative Assets		4	2
Risk Management Purposes
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,657	2,308
Fair Value of Gross Derivative Assets		148	179
Fair Value of Gross Derivative Liabilities		4	0
Risk Management Purposes | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,000	1,800
Fair Value of Gross Derivative Assets		148	175
Fair Value of Gross Derivative Liabilities		2	0
Risk Management Purposes | Derivatives Used As Economic Hedges | Foreign Exchange Spot Forward And Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	657	508
Fair Value of Gross Derivative Assets		0	4
Fair Value of Gross Derivative Liabilities		2	0
Customer-Initiated And Other Activities
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	18,728	19,254
Fair Value of Gross Derivative Assets		521	715
Fair Value of Gross Derivative Liabilities		465	661
Customer-Initiated And Other Activities | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	12,431	12,328
Fair Value of Gross Derivative Assets		136	153
Fair Value of Gross Derivative Liabilities		88	102
Customer-Initiated And Other Activities | Interest Rate Caps And Floors Written
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	312	274
Fair Value of Gross Derivative Assets		0	0
Fair Value of Gross Derivative Liabilities		1	0
Customer-Initiated And Other Activities | Interest Rate Caps and Floors Purchased
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	312	274
Fair Value of Gross Derivative Assets		1	0
Fair Value of Gross Derivative Liabilities		0	0
Customer-Initiated And Other Activities | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	11,807	11,780
Fair Value of Gross Derivative Assets		135	153
Fair Value of Gross Derivative Liabilities		87	102
Customer-Initiated And Other Activities | Energy Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	4,185	4,932
Fair Value of Gross Derivative Assets		349	527
Fair Value of Gross Derivative Liabilities		348	525
Customer-Initiated And Other Activities | Energy Caps and Floors Written
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	939	1,218
Fair Value of Gross Derivative Assets		1	0
Fair Value of Gross Derivative Liabilities		92	173
Customer-Initiated And Other Activities | Energy Caps and Floors Purchased
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	939	1,218
Fair Value of Gross Derivative Assets		92	173
Fair Value of Gross Derivative Liabilities		1	0
Customer-Initiated And Other Activities | Energy Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,307	2,496
Fair Value of Gross Derivative Assets		256	354
Fair Value of Gross Derivative Liabilities		255	352
Customer-Initiated And Other Activities | Foreign Exchange Spot, Forwards, Options and Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,112	1,994
Fair Value of Gross Derivative Assets		36	35
Fair Value of Gross Derivative Liabilities		$ 29	$ 34

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

[2] Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $4 million and $2 million at June 30, 2015 and December 31, 2014, respectively.

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Net Income Per Common Share (Schedule of Average Shares Excluded From Diluted Net Income Per Common Share Computation) (Details) - Stock Options - $ / shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding options	5.0	7.2	5.9	7.9
Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	$ 49.22	$ 49.22	$ 46.68	$ 48.17
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	$ 60.82	$ 60.82	$ 60.82	$ 61.94

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Variable Interest Entities (VIEs) (Tables)

6 Months Ended

Jun. 30, 2015

Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]

Impact Of VIEs On The Consolidated Statements Of Comprehensive Income

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

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2015			2014			2015			2014
Other noninterest income:
Amortization of other tax credit investments	$	—		$	(1	)	$	1		$	(3	)
Provision for income taxes:
Amortization of LIHTC investments	15			14			30			28
Low income housing tax credits	(15		)	(14		)	(30		)	(28		)
Other tax benefits related to tax credit entities	(5		)	(7		)	(10		)	(13		)
Total provision for income taxes	$	(5	)	$	(7	)	(10		)	(13		)

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Business Segment Information (Business Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net interest income (expense) (FTE)		$ 422	$ 417	$ 836	$ 828
Provision for credit losses		47	11	61	20
Noninterest income		261	220	516	428
Noninterest expenses		436	404	895	810
Provision (benefit) for income taxes (FTE)		65	71	127	136
Net income (loss)		135	151	269	290
Net credit-related charge-offs (recoveries)		18	9	26	21
Assets, average		68,963	64,878	68,852	64,794
Loans, average		48,833	46,725	48,494	45,905
Deposits, average		$ 57,398	$ 53,384	$ 57,196	$ 53,079
Return on average assets	[1],[2]	0.79%	0.93%	0.78%	0.90%
Efficiency ratio	[3],[4]	63.68%	63.35%	66.07%	64.55%
Business Bank
Net interest income (expense) (FTE)		$ 375	$ 375	$ 744	$ 744
Provision for credit losses		61	35	86	52
Noninterest income		140	100	282	191
Noninterest expenses		176	143	376	289
Provision (benefit) for income taxes (FTE)		96	100	193	199
Net income (loss)		182	197	371	395
Net credit-related charge-offs (recoveries)		22	9	31	20
Assets, average		39,135	37,305	38,896	36,522
Loans, average		38,109	36,367	37,868	35,567
Deposits, average		$ 30,229	$ 27,351	$ 30,187	$ 27,173
Return on average assets	[2]	1.87%	2.11%	1.91%	2.16%
Efficiency ratio	[4]	34.19%	30.07%	36.69%	30.85%
Retail Bank
Net interest income (expense) (FTE)		$ 155	$ 152	$ 307	$ 301
Provision for credit losses		(8)	(6)	(16)	(5)
Noninterest income		46	41	88	82
Noninterest expenses		182	174	357	348
Provision (benefit) for income taxes (FTE)		9	9	19	14
Net income (loss)		18	16	35	26
Net credit-related charge-offs (recoveries)		1	3	2	6
Assets, average		6,459	6,222	6,414	6,224
Loans, average		5,770	5,554	5,732	5,555
Deposits, average		$ 22,747	$ 21,890	$ 22,577	$ 21,759
Return on average assets	[2]	0.30%	0.29%	0.30%	0.24%
Efficiency ratio	[4]	89.88%	90.06%	90.22%	90.69%
Wealth Management
Net interest income (expense) (FTE)		$ 45	$ 44	$ 88	$ 89
Provision for credit losses		(9)	(10)	(10)	(18)
Noninterest income		60	62	118	122
Noninterest expenses		74	76	151	152
Provision (benefit) for income taxes (FTE)		14	15	23	28
Net income (loss)		26	25	42	49
Net credit-related charge-offs (recoveries)		(5)	(3)	(7)	(5)
Assets, average		5,153	4,987	5,091	4,959
Loans, average		4,954	4,804	4,894	4,783
Deposits, average		$ 4,060	$ 3,616	$ 4,028	$ 3,599
Return on average assets	[2]	2.01%	2.02%	1.65%	1.99%
Efficiency ratio	[4]	70.27%	72.11%	72.40%	72.61%
Finance
Net interest income (expense) (FTE)		$ (155)	$ (160)	$ (308)	$ (318)
Provision for credit losses		0	0	0	0
Noninterest income		14	15	27	29
Noninterest expenses		3	2	5	5
Provision (benefit) for income taxes (FTE)		(54)	(56)	(107)	(111)
Net income (loss)		(90)	(91)	(179)	(183)
Net credit-related charge-offs (recoveries)		0	0	0	0
Assets, average		11,721	11,055	11,930	11,092
Loans, average		0	0	0	0
Deposits, average		93	258	131	305
Other
Net interest income (expense) (FTE)		2	6	5	12
Provision for credit losses		3	(8)	1	(9)
Noninterest income		1	2	1	4
Noninterest expenses		1	9	6	16
Provision (benefit) for income taxes (FTE)		0	3	(1)	6
Net income (loss)		(1)	4	0	3
Net credit-related charge-offs (recoveries)		0	0	0	0
Assets, average		6,495	5,309	6,521	5,997
Loans, average		0	0	0	0
Deposits, average		$ 269	$ 269	$ 273	$ 243

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

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

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

[4] 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) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	[1]	$ 8,267	$ 8,116
Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale		8,267	8,116
Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale		$ 95	$ 136
Recurring | State And Municipal Securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	[2]	3.00%	3.00%
Unobservable Input, Workout period	[2]	1 year	1 year
Recurring | State And Municipal Securities | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	[2]	8.00%	9.00%
Unobservable Input, Workout period	[2]	2 years	3 years
Recurring | Equity and Other Non-Debt Securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	[2]	4.00%	4.00%
Unobservable Input, Workout period	[2]	1 year	1 year
Recurring | Equity and Other Non-Debt Securities | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate	[2]	8.00%	8.00%
Unobservable Input, Workout period	[2]	1 year	2 years

[1] Included auction-rate securities at amortized cost and fair value of $95 million as of June 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

[2] Auction-rate securities.

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Business Segment Information

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Business Segment Information

BUSINESS SEGMENT INFORMATION

The Corporation has strategically aligned its operations into three major business segments: the Business Bank, the Retail Bank and Wealth Management. These business segments are differentiated based on the type of customer and the related products and services provided. In addition to the three major business segments, the Finance Division is also reported as a segment. Business segment results are produced by the Corporation’s internal management accounting system. This system measures financial results based on the internal business unit structure of the Corporation. The performance of the business segments is not comparable with the Corporation's consolidated results and is not necessarily comparable with similar information for any other financial institution. Additionally, because of the interrelationships of the various segments, the information presented is not indicative of how the segments would perform if they operated as independent entities. The management accounting system assigns balance sheet and income statement items to each business segment using certain methodologies, which are regularly reviewed and refined. These methodologies may be modified as the management accounting system is enhanced and changes occur in the organizational structure and/or product lines. For comparability purposes, amounts in all periods are based on business segments and methodologies in effect at June 30, 2015.

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

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

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

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

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

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

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

For further information on the methodologies which form the basis for these results refer to Note 22 to the consolidated financial statements in the Corporation's 2014 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 June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	155		$	45		$	(155	)	$	2		$	422
Provision for credit losses	61			(8		)	(9		)	—			3			47
Noninterest income	140			46			60			14			1			261
Noninterest expenses	176			182			74			3			1			436
Provision (benefit) for income taxes (FTE)	96			9			14			(54		)	—			65
Net income (loss)	$	182		$	18		$	26		$	(90	)	$	(1	)	$	135
Net loan charge-offs (recoveries)	$	22		$	1		$	(5	)	$	—		$	—		$	18
Selected average balances:
Assets	$	39,135		$	6,459		$	5,153		$	11,721		$	6,495		$	68,963
Loans	38,109			5,770			4,954			—			—			48,833
Deposits	30,229			22,747			4,060			93			269			57,398
Statistical data:
Return on average assets (a)	1.87		%	0.30		%	2.01		%	N/M			N/M			0.79		%
Efficiency ratio (b)	34.19		%	89.88		%	70.27		%	N/M			N/M			63.68		%

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Three Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	375		$	152		$	44		$	(160	)	$	6		$	417
Provision for credit losses	35			(6		)	(10		)	—			(8		)	11
Noninterest income	100			41			62			15			2			220
Noninterest expenses	143			174			76			2			9			404
Provision (benefit) for income taxes (FTE)	100			9			15			(56		)	3			71
Net income (loss)	$	197		$	16		$	25		$	(91	)	$	4		$	151
Net loan charge-offs (recoveries)	$	9		$	3		$	(3	)	$	—		$	—		$	9
Selected average balances:
Assets	$	37,305		$	6,222		$	4,987		$	11,055		$	5,309		$	64,878
Loans	36,367			5,554			4,804			—			—			46,725
Deposits	27,351			21,890			3,616			258			269			53,384
Statistical data:
Return on average assets (a)	2.11		%	0.29		%	2.02		%	N/M			N/M			0.93		%
Efficiency ratio b)	30.07		%	90.06		%	72.11		%	N/M			N/M			63.35		%

(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

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Six Months Ended June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	744		$	307		$	88		$	(308	)	$	5		$	836
Provision for credit losses	86			(16		)	(10		)	—			1			61
Noninterest income	282			88			118			27			1			516
Noninterest expenses	376			357			151			5			6			895
Provision (benefit) for income taxes (FTE)	193			19			23			(107		)	(1		)	127
Net income (loss)	$	371		$	35		$	42		$	(179	)	$	—		$	269
Net loan charge-offs (recoveries)	$	31		$	2		$	(7	)	$	—		$	—		$	26
Selected average balances:
Assets	$	38,896		$	6,414		$	5,091		$	11,930		$	6,521		$	68,852
Loans	37,868			5,732			4,894			—			—			48,494
Deposits	30,187			22,577			4,028			131			273			57,196
Statistical data:
Return on average assets (a)	1.91		%	0.30		%	1.65		%	N/M			N/M			0.78		%
Efficiency ratio (b)	36.69			90.22			72.40			N/M			N/M			66.07

(dollar amounts in millions)	Business Bank			Retail Bank			Wealth Management			Finance			Other			Total
Six Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	744		$	301		$	89		$	(318	)	$	12		$	828
Provision for credit losses	52			(5		)	(18		)	—			(9		)	20
Noninterest income	191			82			122			29			4			428
Noninterest expenses	289			348			152			5			16			810
Provision (benefit) for income taxes (FTE)	199			14			28			(111		)	6			136
Net income (loss)	$	395		$	26		$	49		$	(183	)	$	3		$	290
Net loan charge-offs (recoveries)	$	20		$	6		$	(5	)	$	—		$	—		$	21
Selected average balances:
Assets	$	36,522		$	6,224		$	4,959		$	11,092		$	5,997		$	64,794
Loans	35,567			5,555			4,783			—			—			45,905
Deposits	27,173			21,759			3,599			305			243			53,079
Statistical data:
Return on average assets (a)	2.16		%	0.24		%	1.99		%	N/M			N/M			0.90		%
Efficiency ratio (b)	30.85			90.69			72.61			N/M			N/M			64.55

(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 June 30, 2015.

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 June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	179		$	181		$	130		$	85		$	(153	)	$	422
Provision for credit losses	(13		)	4			43			10			3			47
Noninterest income	85			37			31			93			15			261
Noninterest expenses	128			100			94			110			4			436
Provision (benefit) for income taxes (FTE)	51			43			10			15			(54		)	65
Net income (loss)	$	98		$	71		$	14		$	43		$	(91	)	$	135
Net loan charge-offs (recoveries)	$	(2	)	$	6		$	5		$	9		$	—		$	18
Selected average balances:
Assets	$	13,852		$	16,696		$	11,878		$	8,321		$	18,216		$	68,963
Loans	13,290			16,429			11,254			7,860			—			48,833
Deposits	21,706			17,275			10,959			7,096			362			57,398
Statistical data:
Return on average assets (a)	1.73		%	1.54		%	0.46		%	2.05		%	N/M			0.79		%
Efficiency ratio (b)	48.21		%	46.04		%	58.20		%	61.45		%	N/M			63.68		%

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Three Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	182		$	176		$	137		$	76		$	(154	)	$	417
Provision for credit losses	(9		)	14			22			(8		)	(8		)	11
Noninterest income	89			38			35			41			17			220
Noninterest expenses	159			100			89			45			11			404
Provision (benefit) for income taxes (FTE)	44			37			22			21			(53		)	71
Net income (loss)	$	77		$	63		$	39		$	59		$	(87	)	$	151
Net loan charge-offs (recoveries)	$	10		$	5		$	2		$	(8	)	$	—		$	9
Selected average balances:
Assets	$	13,851		$	15,721		$	11,661		$	7,281		$	16,364		$	64,878
Loans	13,482			15,439			10,966			6,838			—			46,725
Deposits	20,694			15,370			10,724			6,069			527			53,384
Statistical data:
Return on average assets (a)	1.42		%	1.54		%	1.30		%	3.28		%	N/M			0.93		%
Efficiency ratio (b)	58.67		%	46.64		%	51.67		%	38.73		%	N/M			63.35		%

(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

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Six Months Ended June 30, 2015
Earnings summary:
Net interest income (expense) (FTE)	$	357		$	357		$	260		$	165		$	(303	)	$	836
Provision for credit losses	(21		)	1			64			16			1			61
Noninterest income	166			74			67			181			28			516
Noninterest expenses	283			199			189			213			11			895
Provision (benefit) for income taxes (FTE)	89			87			28			31			(108		)	127
Net income (loss)	$	172		$	144		$	46		$	86		$	(179	)	$	269
Net loan charge-offs	$	1		$	6		$	8		$	11		$	—		$	26
Selected average balances:
Assets	$	13,794		$	16,580		$	12,034		$	7,993		$	18,451		$	68,852
Loans	13,257			16,312			11,394			7,531			—			48,494
Deposits	21,709			17,057			10,985			7,041			404			57,196
Statistical data:
Return on average assets (a)	1.52		%	1.59		%	0.74		%	2.15		%	N/M			0.78		%
Efficiency ratio (b)	54.14			46.20			57.81			61.01			N/M			66.07

(dollar amounts in millions)	Michigan			California			Texas			Other Markets			Finance & Other			Total
Six Months Ended June 30, 2014
Earnings summary:
Net interest income (expense) (FTE)	$	364		$	349		$	273		$	148		$	(306	)	$	828
Provision for credit losses	(5		)	25			29			(20		)	(9		)	20
Noninterest income	173			73			69			80			33			428
Noninterest expenses	320			197			179			93			21			810
Provision (benefit) for income taxes (FTE)	80			74			48			39			(105		)	136
Net income (loss)	$	142		$	126		$	86		$	116		$	(180	)	$	290
Net loan charge-offs (recoveries)	$	10		$	15		$	8		$	(12	)	$	—		$	21
Selected average balances:
Assets	$	13,835		$	15,429		$	11,367		$	7,074		$	17,089		$	64,794
Loans	13,478			15,133			10,667			6,627			—			45,905
Deposits	20,668			15,078			10,799			5,986			548			53,079
Statistical data:
Return on average assets (a)	1.32		%	1.57		%	1.43		%	3.28		%	N/M			0.90		%
Efficiency ratio (b)	59.56			46.62			52.30			40.99			N/M			64.55

(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