Comerica (CMA) 10-Q 29 Apr 16 2016 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 26, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Amendment Flag	false
Entity Registrant Name	Comerica INC /NEW/
Entity Central Index Key	28,412
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		175,133,972
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks		$ 977	$ 1,157
Interest-bearing deposits with banks		2,025	4,990
Other short-term investments		94	113
Investment securities available-for-sale	[1]	10,607	10,519
Investment securities held-to-maturity		1,907	1,981
Commercial loans		31,562	31,659
Real estate construction loans		2,290	2,001
Commercial mortgage loans		8,982	8,977
Lease financing		731	724
International loans		1,455	1,368
Residential mortgage loans		1,874	1,870
Consumer loans		2,483	2,485
Total loans		49,377	49,084
Less allowance for loan losses		(724)	(634)
Net loans		48,653	48,450
Premises and equipment		541	550
Accrued income and other assets		4,203	4,117
Total assets		69,007	71,877
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing deposits		28,025	30,839
Money market and interest-bearing checking deposits		22,872	23,532
Savings deposits		2,006	1,898
Customer certificates of deposit		3,401	3,552
Foreign office time deposits		47	32
Total interest-bearing deposits		28,326	29,014
Total deposits		56,351	59,853
Short-term borrowings		514	23
Accrued expenses and other liabilities		1,389	1,383
Medium- and long-term debt		3,109	3,058
Total liabilities		61,363	64,317
Common stock - $5 par value: Authorized - 325,000,000 shares; Issued - 228,164,824 shares		1,141	1,141
Capital surplus		2,158	2,173
Accumulated other comprehensive loss		(328)	(429)
Retained earnings		7,097	7,084
Less cost of common stock in treasury - 53,086,733 shares at 3/31/16 and 52,457,113 shares at 12/31/15		(2,424)	(2,409)
Total shareholders' equity		7,644	7,560
Total liabilities and shareholders' equity		$ 69,007	$ 71,877
[1]	Included auction-rate securities at amortized cost and fair value of $61 million and $60 million, respectively as of March 31, 2016 and $76 million and $77 million, respectively, as of December 31, 2015.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
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	53,086,733	52,457,113

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
INTEREST INCOME
Interest and fees on loans	$ 406	$ 378
Interest on investment securities	62	53
Interest on short-term investments	4	4
Total interest income	472	435
INTEREST EXPENSE
Interest on deposits	10	11
Interest on medium- and long-term debt	15	11
Total interest expense	25	22
Net interest income	447	413
Provision for credit losses	148	14
Net interest income after provision for credit losses	299	399
NONINTEREST INCOME
Card fees	74	64
Service charges on deposit accounts	55	55
Fiduciary income	46	47
Commercial lending fees	20	25
Letter of credit fees	13	13
Bank-owned life insurance	9	9
Foreign exchange income	10	10
Brokerage fees	4	4
Net securities losses	(2)	(2)
Other noninterest income	17	27
Total noninterest income	246	252
NONINTEREST EXPENSES
Salaries and benefits expense	248	253
Outside processing fee expense	79	74
Net occupancy expense	38	38
Equipment expense	13	13
Software expense	29	23
FDIC insurance expense	11	9
Advertising expense	4	6
Litigation-related expense	0	1
Other noninterest expenses	38	39
Total noninterest expenses	460	456
Income before income taxes	85	195
Provision for income taxes	25	61
Net Income	60	134
Less income allocated to participating securities	1	2
Net income attributable to common shares	$ 59	$ 132
Basic earnings per common share	$ 0.34	$ 0.75
Diluted earnings per common share	$ 0.34	$ 0.73
Comprehensive income	$ 161	$ 176
Cash dividends declared on common stock	$ 37	$ 36
Cash dividends declared per common share	$ 0.21	$ 0.20

Consolidated Statements Of Chan

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, 2014	$ 7,402	$ 1,141	$ 2,188	$ (412)	$ 6,744	$ (2,259)
Balance (in shares) at Dec. 31, 2014		179
Net income	134				134
Other comprehensive income, net of tax	42			42
Cash dividends declared on common stock	(36)				(36)
Purchase of common stock	(66)					(66)
Purchase of common stock (in shares)		(1.5)
Net issuance of common stock under employee stock plans	7		(16)		(2)	25
Net issuance of common stock under employee stock plans (in shares)		0.6
Share-based compensation	16		16
Other	1				1
Balance at Mar. 31, 2015	7,500	$ 1,141	2,188	(370)	6,841	(2,300)
Balance (in shares) at Mar. 31, 2015		178.1
Balance at Dec. 31, 2015	7,560	$ 1,141	2,173	(429)	7,084	(2,409)
Balance (in shares) at Dec. 31, 2015		175.7
Net income	60				60
Other comprehensive income, net of tax	101			101
Cash dividends declared on common stock	(37)				(37)
Purchase of common stock	(49)					(49)
Purchase of common stock (in shares)		(1.4)
Net issuance of common stock under employee stock plans	(11)		(35)		(10)	34
Net issuance of common stock under employee stock plans (in shares)		0.8
Share-based compensation	20		20
Balance at Mar. 31, 2016	$ 7,644	$ 1,141	$ 2,158	$ (328)	$ 7,097	$ (2,424)
Balance (in shares) at Mar. 31, 2016		175.1

Consolidated Statements Of Cha6

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$ 0.21	$ 0.20

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES
Net income	$ 60	$ 134
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	148	14
Benefit for deferred income taxes	(39)	(21)
Depreciation and amortization	30	30
Net periodic defined benefit cost	3	11
Share-based compensation expense	20	16
Net amortization of securities	2	4
Accretion of loan purchase discount	(2)	(3)
Net securities losses	2	2
Net gains on sales of foreclosed property	(1)	0
Excess tax benefits from share-based compensation arrangements	0	(2)
Net change in accrued income receivable	(4)	(6)
Net change in accrued expenses payable	10	(31)
Other, net	16	190
Net cash provided by operating activities	245	338
INVESTING ACTIVITIES
Maturities and redemptions of investment securities available-for-sale	336	393
Sales of investment securities available-for-sale	14	37
Purchases of investment securities available-for-sale	(291)	(487)
Maturities and redemptions of investment securities held-to-maturity	75	66
Net change in loans	(352)	(487)
Proceeds from sales of foreclosed property	5	2
Net increase in premises and equipment	(27)	(25)
Purchases of Federal Home Loan Bank stock	21	0
Other, net	3	0
Net cash used in investing activities	(258)	(501)
FINANCING ACTIVITIES
Net change in deposits	(3,537)	184
Net change in short-term borrowings	491	(36)
Repurchases of common stock	(49)	(66)
Cash dividends paid on common stock	(37)	(36)
Issuances of common stock under employee stock plans	1	6
Excess tax benefits from share-based compensation arrangements	0	2
Other, net	(1)	0
Net cash (used in) provided by financing activities	(3,132)	54
Net decrease in cash and cash equivalents	(3,145)	(109)
Cash and cash equivalents at beginning of period	6,147	6,071
Cash and cash equivalents at end of period	3,002	5,962
Interest paid	19	19
Income tax paid (refunds received)	2	(103)
Noncash investing and financing activities:
Loans transferred to other real estate	$ 17	$ 2

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation and Accounting Policies	BASIS OF PRESENTATION AND ACCOUNTING POLICIES Organization The accompanying unaudited consolidated financial statements were prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation were included. The results of operations for the three months ended March 31, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 . 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, 2015 . Pending Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, “Leases (Topic 842),” (ASU 2016-02), to increase the transparency and comparability of lease recognition and disclosure. The update requires lessees to recognize lease contracts with a term greater than one year on the balance sheet, while recognizing expenses on the income statement in a manner similar to current guidance. For lessors, the update makes targeted changes to the classification criteria and the lessor accounting model to align the guidance with the new lessee model and revenue guidance. ASU 2016-02 is effective for the Corporation on January 1, 2019 and must be applied using the modified retrospective approach. Early adoption is permitted. The Corporation is currently evaluating the impact of adopting ASU 2016-02. In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payments Accounting,” (ASU 2016-09), which intends to simplify accounting for share based payment transactions, including the income tax consequences and classification of awards. Among other items, the update requires excess tax benefits and deficiencies to be recognized as a component of income taxes within the income statement rather than other comprehensive income as required in current guidance. ASU 2016-09 is effective for the Corporation on January 1, 2017. The recognition of excess tax benefits and deficiencies in the income statement must be adopted prospectively. The method of transition required will differ for other items being amended. Early adoption is permitted. The impact to the Corporation upon adoption is dependent on the market value per share of the Corporation's common stock at option expiration dates and restricted stock vesting dates.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
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, 2015 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. ASSETS AND LIABLILITIES RECORDED AT FAIR VALUE ON A RECURRING BASIS The following tables present the recorded amount of assets and liabilities measured at fair value on a recurring basis as of March 31, 2016 and December 31, 2015 . (in millions) Total Level 1 Level 2 Level 3 March 31, 2016 Trading securities: Deferred compensation plan assets $ 83 $ 83 $ — $ — Equity and other non-debt securities 3 3 — — Total trading securities 86 86 — — Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities 2,823 2,823 — — Residential mortgage-backed securities (a) 7,591 — 7,591 — State and municipal securities 9 — — 9 (b) Corporate debt securities 1 — — 1 (b) Equity and other non-debt securities 183 132 — 51 (b) Total investment securities available-for-sale 10,607 2,955 7,591 61 Derivative assets: Interest rate contracts 407 — 387 20 Energy derivative contracts 393 — 393 — Foreign exchange contracts 53 — 53 — Warrants 2 — — 2 Total derivative assets 855 — 833 22 Total assets at fair value $ 11,548 $ 3,041 $ 8,424 $ 83 Derivative liabilities: Interest rate contracts $ 169 $ — $ 169 $ — Energy derivative contracts 391 — 391 — Foreign exchange contracts 48 — 48 — Total derivative liabilities 608 — 608 — Deferred compensation plan liabilities 83 83 — — Total liabilities at fair value $ 691 $ 83 $ 608 $ — (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, 2015 Trading securities: Deferred compensation plan assets $ 89 $ 89 $ — $ — Equity and other non-debt securities 3 3 — — Total trading securities 92 92 — — Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities 2,763 2,763 — — Residential mortgage-backed securities (a) 7,545 — 7,545 — State and municipal securities 9 — — 9 (b) Corporate debt securities 1 — — 1 (b) Equity and other non-debt securities 201 134 — 67 (b) Total investment securities available-for-sale 10,519 2,897 7,545 77 Derivative assets: Interest rate contracts 286 — 277 9 Energy derivative contracts 475 — 475 — Foreign exchange contracts 57 — 57 — Warrants 2 — — 2 Total derivative assets 820 — 809 11 Total assets at fair value $ 11,431 $ 2,989 $ 8,354 $ 88 Derivative liabilities: Interest rate contracts $ 92 $ — $ 92 $ — Energy derivative contracts 472 — 472 — Foreign exchange contracts 46 — 46 — Total derivative liabilities 610 — 610 — Deferred compensation plan liabilities 89 89 — — Total liabilities at fair value $ 699 $ 89 $ 610 $ — (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-month periods ended March 31, 2016 and 2015 . The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three-month periods ended March 31, 2016 and 2015 . Net Realized/Unrealized Gains (Losses) (Pretax) Balance at Beginning of Period Recorded in Earnings Recorded in Other Comprehensive Income (Loss) Balance at End of Period (in millions) Realized Unrealized Sales Three Months Ended March 31, 2016 Investment securities available-for-sale: State and municipal securities (a) $ 9 $ — $ — $ — $ — $ 9 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 67 — — (1 ) (b) (15 ) 51 Total investment securities available-for-sale 77 — — (1 ) (b) (15 ) 61 Derivative assets: Interest rate contracts 9 — 11 (c) — — 20 Warrants 2 — — — — 2 Three Months Ended March 31, 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 ) (d) — 1 (b) (40 ) 71 Total investment securities available-for-sale 136 (2 ) (d) — 1 (b) (40 ) 95 Derivative assets: Interest rate contracts — — 11 (c) — — 11 Warrants 4 — (1 ) (c) — — 3 (a) Auction-rate securities. (b) Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income (loss). (c) Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income. (d) Realized and unrealized gains and losses due to changes in fair value recorded in "net securities losses" 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. The following table presents assets recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 . No liabilities were recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 . (in millions) Total Level 2 Level 3 March 31, 2016 Loans held-for-sale: Commercial $ 7 $ 7 $ — Loans: Commercial 346 — 346 Commercial mortgage 11 — 11 International 27 — 27 Total loans 384 — 384 Other real estate 1 — 1 Total assets at fair value $ 392 $ 7 $ 385 December 31, 2015 Loans held-for-sale: Commercial $ 8 $ 8 $ — Loans: Commercial 134 — 134 Commercial mortgage 11 — 11 International 8 — 8 Total loans 153 — 153 Other real estate 2 — 2 Total assets at fair value excluding investments recorded at net asset value 163 8 155 Other investments recorded at net asset value: Nonmarketable equity securities (a) 1 Total assets at fair value $ 164 (a) Certain investments that are measured at fair value using the net asset value have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets. Level 3 assets recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 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 Corporation's Level 3 recurring fair value measurements primarily include auction-rate securities where fair value is determined using an income approach based on a discounted cash flow model and certain interest rate derivative contracts where credit valuation adjustments are significant to the overall fair value of the derivative. 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 March 31, 2016 workout periods reflect the view that short-term interest rates could rise at a slower pace in 2016 than was expected at December 31, 2015 . Discounted Cash Flow Model Unobservable Input Fair Value (in millions) Discount Rate Workout Period (in years) March 31, 2016 State and municipal securities (a) $ 9 5% - 6% 1 - 3 Equity and other non-debt securities (a) 51 6% - 9% 1 - 2 December 31, 2015 State and municipal securities (a) $ 9 3% - 8% 1 - 2 Equity and other non-debt securities (a) 67 4% - 9% 1 (a) Auction-rate securities. ESTIMATED FAIR VALUES OF FINANCIAL INSTRUMENTS NOT RECORDED AT FAIR VALUE ON A RECURRING BASIS The Corporation typically holds the majority of its financial instruments until maturity and thus does not expect to realize many of the estimated fair value amounts disclosed. The disclosures also do not include estimated fair value amounts for items that are not defined as financial instruments, but which have significant value. These include such items as core deposit intangibles, the future earnings potential of significant customer relationships and the value of trust operations and other fee generating businesses. The Corporation believes the imprecision of an estimate could be significant. The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis on the Corporation’s consolidated balance sheets are as follows: Carrying Amount Estimated Fair Value (in millions) Total Level 1 Level 2 Level 3 March 31, 2016 Assets Cash and due from banks $ 977 $ 977 $ 977 $ — $ — Interest-bearing deposits with banks 2,025 2,025 2,025 — — Investment securities held-to-maturity 1,907 1,927 — 1,927 — Loans held-for-sale (a) 8 8 — 8 — Total loans, net of allowance for loan losses (b) 48,653 48,588 — — 48,588 Customers’ liability on acceptances outstanding 4 4 4 — — Restricted equity investments 113 113 113 — — Nonmarketable equity securities (c) (d) 10 18 Liabilities Demand deposits (noninterest-bearing) 28,025 28,025 — 28,025 — Interest-bearing deposits 24,925 24,925 — 24,925 — Customer certificates of deposit 3,401 3,390 — 3,390 — Total deposits 56,351 56,340 — 56,340 — Short-term borrowings 514 514 514 — — Acceptances outstanding 4 4 4 — — Medium- and long-term debt 3,109 3,029 — 3,029 — Credit-related financial instruments (83 ) (83 ) — — (83 ) December 31, 2015 Assets Cash and due from banks $ 1,157 $ 1,157 $ 1,157 $ — $ — Interest-bearing deposits with banks 4,990 4,990 4,990 — — Investment securities held-to-maturity 1,981 1,973 — 1,973 — Loans held-for-sale (a) 21 21 — 21 — Total loans, net of allowance for loan losses (b) 48,450 48,269 — — 48,269 Customers’ liability on acceptances outstanding 5 5 5 — — Restricted equity investments 92 92 92 — — Nonmarketable equity securities (c) (d) 10 18 Liabilities Demand deposits (noninterest-bearing) 30,839 30,839 — 30,839 — Interest-bearing deposits 25,462 25,462 — 25,462 — Customer certificates of deposit 3,552 3,536 — 3,536 — Total deposits 59,853 59,837 — 59,837 — Short-term borrowings 23 23 23 — — Acceptances outstanding 5 5 5 — — Medium- and long-term debt 3,058 3,032 — 3,032 — Credit-related financial instruments (83 ) (83 ) — — (83 ) (a) Included $7 million and $8 million impaired loans held-for-sale recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 , respectively. (b) Included $384 million and $153 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 , respectively. (c) Included $1 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at December 31, 2015 . (d) Certain investments that are measured at fair value using the net asset value have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities $ 2,769 $ 54 $ — $ 2,823 Residential mortgage-backed securities (a) 7,468 135 12 7,591 State and municipal securities 9 — — 9 Corporate debt securities 1 — — 1 Equity and other non-debt securities 183 1 1 183 Total investment securities available-for-sale (b) $ 10,430 $ 190 $ 13 $ 10,607 Investment securities held-to-maturity (c): Residential mortgage-backed securities (a) $ 1,907 $ 20 $ — $ 1,927 December 31, 2015 Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities $ 2,769 $ 1 $ 7 $ 2,763 Residential mortgage-backed securities (a) 7,513 76 44 7,545 State and municipal securities 9 — — 9 Corporate debt securities 1 — — 1 Equity and other non-debt securities 199 2 — 201 Total investment securities available-for-sale (b) $ 10,491 $ 79 $ 51 $ 10,519 Investment securities held-to-maturity (c): Residential mortgage-backed securities (a) $ 1,981 $ 2 $ 10 $ 1,973 (a) 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 $61 million and $60 million , respectively as of March 31, 2016 and $76 million and $77 million , respectively, as of December 31, 2015 . (c) The amortized cost of investment securities held-to-maturity included net unrealized losses of $14 million at March 31, 2016 and $15 million at December 31, 2015 related to securities transferred from 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 March 31, 2016 and December 31, 2015 follows: Temporarily Impaired Less than 12 Months 12 Months or more Total (in millions) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses March 31, 2016 Residential mortgage-backed securities (a) $ 137 $ — $ 1,989 $ 25 $ 2,126 $ 25 State and municipal securities (b) — — 9 — (c) 9 — (c) Corporate debt securities (b) — — 1 — (c) 1 — (c) Equity and other non-debt securities (b) 51 1 — — 51 1 Total temporarily impaired securities $ 188 $ 1 $ 1,999 $ 25 $ 2,187 $ 26 December 31, 2015 U.S. Treasury and other U.S. government agency securities $ 2,265 $ 7 $ — $ — $ 2,265 $ 7 Residential mortgage-backed securities (a) 2,665 21 1,976 51 4,641 72 State and municipal securities (b) — — 9 — (c) 9 — (c) Corporate debt securities (b) — — 1 — (c) 1 — (c) Equity and other non-debt securities (b) 14 — (c) — — 14 — (c) Total temporarily impaired securities $ 4,944 $ 28 $ 1,986 $ 51 $ 6,930 $ 79 (a) Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (b) Primarily auction-rate securities. (c) Unrealized losses less than $0.5 million. At March 31, 2016 , the Corporation had 109 securities in an unrealized loss position with no credit impairment, including 63 residential mortgage-backed securities, 16 state and municipal auction-rate securities, one corporate auction-rate debt security and 29 equity and other non-debt auction-rate preferred securities. As of March 31, 2016 , approximately 95 percent of the aggregate par value of auction-rate securities have been redeemed or sold since acquisition, of which approximately 90 percent were redeemed at or above cost. The unrealized losses for these securities resulted from changes in market interest rates and liquidity. The Corporation ultimately expects full collection of the carrying amount of these securities, does not intend to sell the securities in an unrealized loss position, and it is not more-likely-than-not that the Corporation will be required to sell the securities in an unrealized loss position prior to recovery of amortized cost. The Corporation does not consider these securities to be other-than-temporarily impaired at March 31, 2016 . Sales, calls and write-downs of investment securities available-for-sale resulted in no securities gains and $2 million of securities losses in each of the three-month periods ended March 31, 2016 , and 2015 , recorded in “net securities losses” on the consolidated statements of comprehensive income, computed based on the adjusted cost of the specific security. The following table summarizes the amortized cost and fair values of debt securities by contractual maturity. Securities with multiple maturity dates are classified in the period of final maturity. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. (in millions) Available-for-sale Held-to-maturity March 31, 2016 Amortized Cost Fair Value Amortized Cost Fair Value Contractual maturity Within one year $ 10 $ 10 $ — $ — After one year through five years 3,002 3,058 — — After five years through ten years 1,438 1,490 — — After ten years 5,797 5,866 1,907 1,927 Subtotal 10,247 10,424 1,907 1,927 Equity and other non-debt securities 183 183 — — Total investment securities $ 10,430 $ 10,607 $ 1,907 $ 1,927 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 $7.5 billion and $7.6 billion , respectively, and residential mortgage-backed securities held-to-maturity with a total amortized cost and fair value of $1.9 billion . The actual cash flows of mortgage-backed securities may differ from contractual maturity as the borrowers of the underlying loans may exercise prepayment options. At March 31, 2016 , investment securities with a carrying value of $1.8 billion were pledged where permitted or required by law to secure $1.2 billion of liabilities, primarily public and other deposits of state and local government agencies and derivative instruments.

Credit Quality And Allowance Fo

Credit Quality And Allowance For Credit Losses	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 Business loans: Commercial $ 44 $ 19 $ 2 $ 65 $ 547 $ 30,950 $ 31,562 Real estate construction: Commercial Real Estate business line (a) — — — — — 1,947 1,947 Other business lines (b) — 3 — 3 — 340 343 Total real estate construction — 3 — 3 — 2,287 2,290 Commercial mortgage: Commercial Real Estate business line (a) 18 13 — 31 8 2,129 2,168 Other business lines (b) 7 5 2 14 39 6,761 6,814 Total commercial mortgage 25 18 2 45 47 8,890 8,982 Lease financing — — — — 6 725 731 International 10 12 — 22 27 1,406 1,455 Total business loans 79 52 4 135 627 44,258 45,020 Retail loans: Residential mortgage 6 1 9 16 26 1,832 1,874 Consumer: Home equity 5 2 — 7 27 1,704 1,738 Other consumer 1 1 — 2 1 742 745 Total consumer 6 3 — 9 28 2,446 2,483 Total retail loans 12 4 9 25 54 4,278 4,357 Total loans $ 91 $ 56 $ 13 $ 160 $ 681 $ 48,536 $ 49,377 December 31, 2015 Business loans: Commercial $ 46 $ 12 $ 13 $ 71 $ 238 $ 31,350 $ 31,659 Real estate construction: Commercial Real Estate business line (a) 5 — — 5 — 1,676 1,681 Other business lines (b) 3 — — 3 1 316 320 Total real estate construction 8 — — 8 1 1,992 2,001 Commercial mortgage: Commercial Real Estate business line (a) 7 — 1 8 16 2,080 2,104 Other business lines (b) 7 5 3 15 44 6,814 6,873 Total commercial mortgage 14 5 4 23 60 8,894 8,977 Lease financing — — — — 6 718 724 International 2 — — 2 8 1,358 1,368 Total business loans 70 17 17 104 313 44,312 44,729 Retail loans: Residential mortgage 26 1 — 27 27 1,816 1,870 Consumer: Home equity 5 3 — 8 27 1,685 1,720 Other consumer 7 — — 7 — 758 765 Total consumer 12 3 — 15 27 2,443 2,485 Total retail loans 38 4 — 42 54 4,259 4,355 Total loans $ 108 $ 21 $ 17 $ 146 $ 367 $ 48,571 $ 49,084 (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 March 31, 2016 Business loans: Commercial $ 28,295 $ 1,227 $ 1,493 $ 547 $ 31,562 Real estate construction: Commercial Real Estate business line (e) 1,947 — — — 1,947 Other business lines (f) 334 8 1 — 343 Total real estate construction 2,281 8 1 — 2,290 Commercial mortgage: Commercial Real Estate business line (e) 2,104 32 24 8 2,168 Other business lines (f) 6,451 189 135 39 6,814 Total commercial mortgage 8,555 221 159 47 8,982 Lease financing 704 14 7 6 731 International 1,334 41 53 27 1,455 Total business loans 41,169 1,511 1,713 627 45,020 Retail loans: Residential mortgage 1,837 1 10 26 1,874 Consumer: Home equity 1,706 2 3 27 1,738 Other consumer 737 3 4 1 745 Total consumer 2,443 5 7 28 2,483 Total retail loans 4,280 6 17 54 4,357 Total loans $ 45,449 $ 1,517 $ 1,730 $ 681 $ 49,377 December 31, 2015 Business loans: Commercial $ 29,117 $ 1,293 $ 1,011 $ 238 $ 31,659 Real estate construction: Commercial Real Estate business line (e) 1,681 — — — 1,681 Other business lines (f) 318 1 — 1 320 Total real estate construction 1,999 1 — 1 2,001 Commercial mortgage: Commercial Real Estate business line (e) 2,031 31 26 16 2,104 Other business lines (f) 6,536 172 121 44 6,873 Total commercial mortgage 8,567 203 147 60 8,977 Lease financing 693 17 8 6 724 International 1,245 59 56 8 1,368 Total business loans 41,621 1,573 1,222 313 44,729 Retail loans: Residential mortgage 1,828 2 13 27 1,870 Consumer: Home equity 1,687 1 5 27 1,720 Other consumer 755 3 7 — 765 Total consumer 2,442 4 12 27 2,485 Total retail loans 4,270 6 25 54 4,355 Total loans $ 45,891 $ 1,579 $ 1,247 $ 367 $ 49,084 (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-58 in the Corporation's 2015 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities. (e) Primarily loans to real estate developers. (f) Primarily loans secured by owner-occupied real estate. The following table summarizes nonperforming assets. (in millions) March 31, 2016 December 31, 2015 Nonaccrual loans $ 681 $ 367 Reduced-rate loans (a) 8 12 Total nonperforming loans 689 379 Foreclosed property (b) 25 12 Total nonperforming assets $ 714 $ 391 (a) There were no reduced-rate business loans at both March 31, 2016 and December 31, 2015 . Reduced-rate retail loans were $8 million and $12 million at March 31, 2016 and December 31, 2015 , respectively. (b) Included $8 million and $9 million of foreclosed residential real estate properties at March 31, 2016 and December 31, 2015 , respectively. There were no retail loans secured by residential real estate properties in process of foreclosure included in nonaccrual loans at March 31, 2016 compared to $1 million at December 31, 2015 . Allowance for Credit Losses The following table details the changes in the allowance for loan losses and related loan amounts. 2016 2015 (in millions) Business Loans Retail Loans Total Business Loans Retail Loans Total Three Months Ended March 31 Allowance for loan losses: Balance at beginning of period $ 579 $ 55 $ 634 $ 534 $ 60 $ 594 Loan charge-offs (75 ) (2 ) (77 ) (21 ) (2 ) (23 ) Recoveries on loans previously charged-off 24 1 25 12 3 15 Net loan (charge-offs) recoveries (51 ) (1 ) (52 ) (9 ) 1 (8 ) Provision for loan losses 145 (4 ) 141 17 (1 ) 16 Foreign currency translation adjustment 1 — 1 (1 ) — (1 ) Balance at end of period $ 674 $ 50 $ 724 $ 541 $ 60 $ 601 As a percentage of total loans 1.50 % 1.14 % 1.47 % 1.21 % 1.39 % 1.22 % March 31 Allowance for loan losses: Individually evaluated for impairment $ 88 $ — $ 88 $ 31 $ — $ 31 Collectively evaluated for impairment 586 50 636 510 60 570 Total allowance for loan losses $ 674 $ 50 $ 724 $ 541 $ 60 $ 601 Loans: Individually evaluated for impairment $ 755 $ 27 $ 782 $ 169 $ 37 $ 206 Collectively evaluated for impairment 44,265 4,330 48,595 44,622 4,242 48,864 Purchased credit impaired (PCI) loans (a) — — — — 2 2 Total loans evaluated for impairment $ 45,020 $ 4,357 $ 49,377 $ 44,791 $ 4,281 $ 49,072 (a) No allowance for loan losses was required for PCI loans at March 31, 2016 and 2015. Changes in the allowance for credit losses on lending-related commitments, included in "accrued expenses and othe r liabilities" on the consolidated balance sheets, are summarized in the following table. Three Months Ended March 31, (in millions) 2016 2015 Balance at beginning of period $ 45 $ 41 Charge-offs on lending related commitments (a) (6 ) — Provision for credit losses on lending-related commitments 7 (2 ) Balance at end of period $ 46 $ 39 (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 March 31, 2016 Business loans: Commercial $ 106 $ 583 $ 689 $ 778 $ 80 Commercial mortgage: Commercial Real Estate business line (a) — 8 8 15 1 Other business lines (b) — 31 31 46 5 Total commercial mortgage — 39 39 61 6 International — 27 27 35 2 Total business loans 106 649 755 874 88 Retail loans: Residential mortgage 12 — 12 12 — Consumer: Home equity 12 — 12 12 — Other consumer 3 — 3 3 — Total consumer 15 — 15 15 — Total retail loans (c) 27 — 27 27 — Total individually evaluated impaired loans $ 133 $ 649 $ 782 $ 901 $ 88 December 31, 2015 Business loans: Commercial $ 82 $ 252 $ 334 $ 398 $ 45 Commercial mortgage: Commercial Real Estate business line (a) 7 8 15 38 1 Other business lines (b) 2 32 34 55 5 Total commercial mortgage 9 40 49 93 6 International — 10 10 17 2 Total business loans 91 302 393 508 53 Retail loans: Residential mortgage 13 — 13 13 — Consumer: Home equity 12 — 12 16 — Other consumer 6 — 6 10 — Total consumer 18 — 18 26 — Total retail loans (c) 31 — 31 39 — Total individually evaluated impaired loans $ 122 $ 302 $ 424 $ 547 $ 53 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate. (c) Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy which results 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 2016 2015 (in millions) Average Balance for the Period Interest Income Recognized for the Period Average Balance for the Period Interest Income Recognized for the Period Three Months Ended March 31 Business loans: Commercial $ 511 $ 4 $ 109 $ 1 Commercial mortgage: Commercial Real Estate business line (a) 11 — 19 — Other business lines (b) 33 — 44 — Total commercial mortgage 44 — 63 — International 19 — 1 — Total business loans 574 4 173 1 Retail loans: Residential mortgage 12 — 23 — Consumer loans: Home equity 12 — 12 — Other consumer 5 — 4 — Total consumer 17 — 16 — Total retail loans 29 — 39 — Total individually evaluated impaired loans $ 603 $ 4 $ 212 $ 1 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate. Troubled Debt Restructurings The following tables detail the recorded balance at March 31, 2016 and 2015 of loans considered to be TDRs that were restructured during the three-month periods ended March 31, 2016 and 2015 , 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. 2016 2015 Type of Modification (in millions) Principal Deferrals (a) Interest Rate Reductions AB Note Restructures (b) Total Modifications Principal Deferrals (a) Three Months Ended March 31 Business loans: Commercial $ 144 $ — $ 16 $ 160 $ — Commercial mortgage: Other business lines (c) 1 — — 1 3 International — — 11 11 — Total business loans 145 — 27 172 3 Retail loans: Residential mortgage — 2 — 2 — Total loans $ 145 $ 2 $ 27 $ 174 $ 3 (a) Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates. (b) Loan restructurings whereby the original loan is restructured into two notes: an "A" note, which generally reflects the portion of the modified loan which is expected to be collected; and a "B" note, which is either fully charged off or exchanged for an equity interest. (c) Primarily loans secured by owner-occupied real estate. Commitments to lend additional funds to borrowers whose terms have been modified in TDRs were $14 million at March 31, 2016 and $6 million at December 31, 2015 . The majority of the modifications considered to be TDRs that occurred during the three months ended March 31, 2016 and 2015 were principal deferrals. The Corporation charges interest on principal balances outstanding during deferral periods. Additionally, none of the modifications involved forgiveness of principal. As a result, the current and future financial effects of the recorded balance of loans considered to be TDRs that were restructured during the three months ended March 31, 2016 and 2015 were insignificant. On an ongoing basis, the Corporation monitors the performance of modified loans to their restructured terms. In the event of a subsequent default, the allowance for loan losses continues to be reassessed on the basis of an individual evaluation of the loan. The following table presents information regarding the recorded balance at March 31, 2016 and 2015 of loans modified by principal deferral during the twelve-month periods ended March 31, 2016 and 2015 , and those principal deferrals which experienced a subsequent default during the three-month periods ended March 31, 2016 and 2015 . 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. 2016 2015 (in millions) Balance at March 31 Subsequent Default in the Three Months Ended March 31 Balance at March 31 Subsequent Default in the Three Months Ended March 31 Principal deferrals: Business loans: Commercial $ 281 $ 1 $ 20 $ 15 Commercial mortgage: Commercial Real Estate business line (a) 8 6 — — Other business lines (b) 3 — 9 1 Total commercial mortgage 11 6 9 1 International 1 — — — Total business loans 293 7 29 16 Retail loans: Residential mortgage — — 1 (c) — Consumer: Home equity 1 (c) — 1 (c) — Total retail loans 1 — 2 — Total principal deferrals $ 294 $ 7 $ 31 $ 16 (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 March 31, 2016 and 2015 , loans with a carrying value of $4 million and $3 million , respectively, were modified by interest rate reduction. During the twelve month period ended March 31, 2016 , loans with a carrying value of $27 million were restructured into two notes (AB note restructures). For reduced-rate loans and AB Note restructures, a subsequent payment default is defined in terms of delinquency, when a principal or interest payment is 90 days past due. There were no subsequent payment defaults of reduced-rate loans or AB note restructures during the three-month periods ended March 31, 2016 and 2015 .

Derivative And Credit-Related F

Derivative And Credit-Related Financial Instruments	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 , counterparties with bilateral collateral agreements had pledged $93 million of marketable investment securities and deposited $319 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had pledged $29 million of marketable investment securities and posted $6 million of cash as collateral for contracts in an unrealized loss position. For those counterparties not covered under bilateral collateral agreements, collateral is obtained, if deemed necessary, based on the results of management’s credit evaluation of the counterparty. Collateral varies, but may include cash, investment securities, accounts receivable, equipment or real estate. Included in the fair value of derivative instruments are credit valuation adjustments reflecting counterparty credit risk. These adjustments are determined by applying a credit spread for the counterparty or the Corporation, as appropriate, to the total expected exposure of the derivative. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position at March 31, 2016 was $5 million , for which the Corporation had pledged no collateral. The credit-risk-related contingent features require the Corporation's debt to maintain an investment grade credit rating from each of the major credit rating agencies. If the Corporation's debt were to fall below investment grade, the counterparties to the derivative instruments could require additional overnight collateral on derivative instruments in net liability positions. If the credit-risk-related contingent features underlying these agreements had been triggered on March 31, 2016 , the Corporation would have been required to assign an additional $5 million of collateral to its counterparties. Derivative Instruments Derivative instruments utilized by the Corporation are negotiated over-the-counter and primarily include swaps, caps and floors, forward contracts and options, each of which may relate to interest rates, energy commodity prices or foreign currency exchange rates. Swaps are agreements in which two parties periodically exchange cash payments based on specified indices applied to a specified notional amount until a stated maturity. Caps and floors are agreements which entitle the buyer to receive cash payments based on the difference between a specified reference rate or price and an agreed strike rate or price, applied to a specified notional amount until a stated maturity. Forward contracts are over-the-counter agreements to buy or sell an asset at a specified future date and price. Options are similar to forward contracts except the purchaser has the right, but not the obligation, to buy or sell the asset during a specified period or at a specified future date. Over-the-counter contracts are tailored to meet the needs of the counterparties involved and, therefore, contain a greater degree of credit risk and liquidity risk than exchange-traded contracts, which have standardized terms and readily available price information. The Corporation reduces exposure to market and liquidity risks from over-the-counter derivative instruments entered into for risk management purposes, and transactions entered into to mitigate the market risk associated with customer-initiated transactions, by conducting hedging transactions with investment grade domestic and foreign financial institutions and subjecting counterparties to credit approvals, limits and collateral monitoring procedures similar to those used in making other extensions of credit. In addition, certain derivative contracts executed bilaterally with a dealer counterparty in the over-the-counter market are cleared through a clearinghouse, whereby the clearinghouse becomes the counterparty to the transaction. The following table presents the composition of the Corporation’s derivative instruments held or issued for risk management purposes or in connection with customer-initiated and other activities at March 31, 2016 and December 31, 2015 . The table excludes commitments and warrants accounted for as derivatives. March 31, 2016 December 31, 2015 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 $ 2,525 $ 193 $ — $ 2,525 $ 147 $ — Derivatives used as economic hedges Foreign exchange contracts: Spot, forwards and swaps 785 1 5 593 3 — Total risk management purposes 3,310 194 5 3,118 150 — Customer-initiated and other activities Interest rate contracts: Caps and floors written 273 — — 253 — — Caps and floors purchased 273 — — 253 — — Swaps 12,286 214 169 11,722 139 92 Total interest rate contracts 12,832 214 169 12,228 139 92 Energy contracts: Caps and floors written 417 — 57 536 — 85 Caps and floors purchased 417 57 — 536 85 — Swaps 1,786 336 334 2,055 390 387 Total energy contracts 2,620 393 391 3,127 475 472 Foreign exchange contracts: Spot, forwards, options and swaps 2,444 52 43 2,291 54 46 Total customer-initiated and other activities 17,896 659 603 17,646 668 610 Total gross derivatives $ 21,206 853 608 $ 20,764 818 610 Amounts offset in the consolidated balance sheets: Netting adjustment - Offsetting derivative assets/liabilities (118 ) (118 ) (127 ) (127 ) Netting adjustment - Cash collateral received/posted (256 ) (6 ) (291 ) (3 ) Net derivatives included in the consolidated balance sheets (b) 479 484 400 480 Amounts not offset in the consolidated balance sheets: Marketable securities pledged under bilateral collateral agreements (90 ) (28 ) (137 ) (3 ) Net derivatives after deducting amounts not offset in the consolidated balance sheets $ 389 $ 456 $ 263 $ 477 (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 $10 million and $5 million at March 31, 2016 and December 31, 2015 , 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 related to medium- and long-term debt 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 $17 million and $18 million for the three months ended March 31, 2016 and 2015 , respectively. The Corporation recognized net gains of $3 million and $1 million for the three months ended March 31, 2016 and 2015 , respectively, in "other noninterest income" in the consolidated statements of 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 gains and losses for each of the three-month periods ended March 31, 2016 and 2015 on risk management derivative instruments used as economic hedges, included in "other noninterest income" in the consolidated statements of income. The following table summarizes the expected weighted average remaining maturity of the notional amount of risk management interest rate swaps and the weighted average interest rates associated with amounts expected to be received or paid on interest rate swap agreements as of March 31, 2016 and December 31, 2015 . Weighted Average (dollar amounts in millions) Notional Amount Remaining Maturity (in years) Receive Rate Pay Rate (a) March 31, 2016 Swaps - fair value - receive fixed/pay floating rate Medium- and long-term debt designation $ 2,525 4.8 3.89 % 1.29 % December 31, 2015 Swaps - fair value - receive fixed/pay floating rate Medium- and long-term debt designation 2,525 5.1 3.89 1.11 (a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at March 31, 2016 and December 31, 2015 . 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 position within the limits described above, the Corporation recognized an insignificant amount of net gains in “other noninterest income” in the consolidated statements of comprehensive income for each of the three-month periods ended March 31, 2016 and 2015 . Fair values of customer-initiated and other derivative instruments represent the net unrealized gains or losses on such contracts and are recorded in the consolidated balance sheets. Changes in fair value are recognized in the consolidated statements of comprehensive income. The net gains recognized in income on customer-initiated derivative instruments, net of the impact of offsetting positions, were as follows . Three Months Ended March 31, (in millions) Location of Gain 2016 2015 Interest rate contracts Other noninterest income $ 2 $ 2 Energy contracts Other noninterest income — 1 Foreign exchange contracts Foreign exchange income 10 10 Total $ 12 $ 13 Credit-Related Financial Instruments The Corporation issues off-balance sheet financial instruments in connection with commercial and consumer lending activities. The Corporation’s credit risk associated with these instruments is represented by the contractual amounts indicated in the following table. (in millions) March 31, 2016 December 31, 2015 Unused commitments to extend credit: Commercial and other $ 25,032 $ 26,115 Bankcard, revolving check credit and home equity loan commitments 2,468 2,414 Total unused commitments to extend credit $ 27,500 $ 28,529 Standby letters of credit $ 3,949 $ 3,985 Commercial letters of credit 61 41 The Corporation maintains an allowance to cover probable credit losses inherent in lending-related commitments, including unused commitments to extend credit, letters of credit and financial guarantees. At March 31, 2016 and December 31, 2015 , the allowance for credit losses on lending-related commitments, included in “accrued expenses and other liabilities” on the consolidated balance sheets, was $46 million and $45 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 $35 million and $33 million at March 31, 2016 and December 31, 2015 , respectively, for probable credit losses inherent in the Corporation’s unused commitments to extend credit. Standby and Commercial Letters of Credit Standby letters of credit represent conditional obligations of the Corporation which guarantee the performance of a customer to a third party. Standby letters of credit are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing and similar transactions. Commercial letters of credit are issued to finance foreign or domestic trade transactions. These contracts expire in decreasing amounts through the year 2022 . The Corporation may enter into participation arrangements with third parties that effectively reduce the maximum amount of future payments which may be required under standby and commercial letters of credit. These risk participations covered $319 million and $287 million at March 31, 2016 and December 31, 2015 , respectively, of the $4.0 billion of standby and commercial letters of credit outstanding at both March 31, 2016 and December 31, 2015 . 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 $47 million at March 31, 2016 , including $36 million in deferred fees and $11 million in the allowance for credit losses on lending-related commitments. At December 31, 2015 , the comparable amounts were $49 million , $37 million and $12 million , respectively. The following table presents a summary of criticized standby and commercial letters of credit at March 31, 2016 and December 31, 2015 . The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines. (dollar amounts in millions) March 31, 2016 December 31, 2015 Total criticized standby and commercial letters of credit $ 135 $ 110 As a percentage of total outstanding standby and commercial letters of credit 3.4 % 2.7 % Other Credit-Related Financial Instruments The Corporation enters into credit risk participation agreements, under which the Corporation assumes credit exposure associated with a borrower’s performance related to certain interest rate derivative contracts. The Corporation is not a party to the interest rate derivative contracts and only enters into these credit risk participation agreements in instances in which the Corporation is also a party to the related loan participation agreement for such borrowers. The Corporation manages its credit risk on the credit risk participation agreements by monitoring the creditworthiness of the borrowers, which is based on the normal credit review process had it entered into the derivative instruments directly with the borrower. The notional amount of such credit risk participation agreement reflects the pro-rata share of the derivative instrument, consistent with its share of the related participated loan. As of March 31, 2016 and December 31, 2015 , the total notional amount of the credit risk participation agreements was approximately $523 million and $559 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 at both March 31, 2016 and December 31, 2015 . The maximum estimated exposure to these agreements, as measured by projecting a maximum value of the guaranteed derivative instruments, assuming 100 percent default by all obligors on the maximum values, was approximately $10 million and $5 million at March 31, 2016 and December 31, 2015 , respectively. In the event of default, the lead bank has the ability to liquidate the assets of the borrower, in which case the lead bank would be required to return a percentage of the recouped assets to the participating banks. As of March 31, 2016 , the weighted average remaining maturity of outstanding credit risk participation agreements was 2.3 years.

Variable Interest Entities (VIE

Variable Interest Entities (VIEs)	3 Months Ended
	Mar. 31, 2016
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 it does not have 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. The Corporation accounts for its interests in LIHTC entities using the proportional amortization method. Exposure to loss as a result of the Corporation’s involvement with LIHTC entities at March 31, 2016 was limited to approximately $411 million . Ownership interests in other community development projects which generate similar tax credits to investors (other tax credit entities) are accounted for under either the cost or equity method. Exposure to loss as a result of the Corporation's involvement in other tax credit entities at March 31, 2016 was limited to approximately $9 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 ( $156 million at March 31, 2016 ). Amortization and other write-downs of LIHTC investments are presented on a net basis as a component of the "provision for income taxes" on the consolidated statements of comprehensive income, while amortization and write-downs of other tax credit investments are recorded in “other noninterest income." The income tax credits and deductions are recorded as a reduction of income tax expense and a reduction of federal income taxes payable. The Corporation provided no financial or other support that was not contractually required to any of the above VIEs during the three months ended March 31, 2016 and 2015 . The following table summarizes the impact of these tax credit entities on line items on the Corporation’s consolidated statements of comprehensive income. Three Months Ended March 31, (in millions) 2016 2015 Other noninterest income: Amortization of other tax credit investments $ — $ 1 Provision for income taxes: Amortization of LIHTC investments 16 15 Low income housing tax credits (16 ) (15 ) Other tax benefits related to tax credit entities (6 ) (5 ) Total provision for income taxes $ (6 ) $ (5 ) For further information on the Corporation’s consolidation policy, see Note 1 to the consolidated financial statements in the Corporation's 2015 Annual Report.

Medium- And Long-Term Debt

Medium- And Long-Term Debt	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Medium- And Long-Term Debt	MEDIUM- AND LONG-TERM DEBT Medium- and long-term debt is summarized as follows: (in millions) March 31, 2016 December 31, 2015 Parent company Subordinated notes: 3.80% subordinated notes due 2026 (a) 272 259 Medium-term notes: 2.125% notes due 2019 (a) 354 349 Total parent company 626 608 Subsidiaries Subordinated notes: 5.75% subordinated notes due 2016 (a) (b) 657 659 5.20% subordinated notes due 2017 (a) 527 530 4.00% subordinated notes due 2025 (a) 367 351 7.875% subordinated notes due 2026 (a) 231 223 Total subordinated notes 1,782 1,763 Medium-term notes: 2.50% notes due 2020 (a) 685 671 Other notes: 6.0% - 6.4% fixed-rate notes due 2020 16 16 Total subsidiaries 2,483 2,450 Total medium- and long-term debt $ 3,109 $ 3,058 (a) The fixed interest rates on these notes have been swapped to a variable rate and designated in a hedging relationship. Accordingly, carrying value has been adjusted to reflect the change in the fair value of the debt as a result of changes in the benchmark rate. (b) The fixed interest rate on $250 million of $600 million total par value of these notes have been swapped to a variable rate. Subordinated notes with remaining maturities greater than one year qualify as Tier 2 capital. Unamortized debt issuance costs deducted from the carrying amount of medium- and long-term debt totaled $8 million at both March 31, 2016 and December 31, 2015 . Comerica Bank (the Bank), a wholly-owned subsidiary of the Corporation, 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 March 31, 2016 , $15 billion of real estate-related loans were pledged to the FHLB as blanket collateral for potential future borrowings of approximately $5.6 billion . In early April 2016, the Bank issued a total of $1.6 billion of 10-year, floating-rate FHLB advances, with an initial interest rate of 0.399% , due March 4, 2026 . The interest rate on each of four notes resets every four weeks, based on the FHLB auction rate, with the reset date of each note scheduled at one-week intervals. Each note may be prepaid in full, without penalty, at each scheduled reset date. Proceeds were used for general corporate purposes.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE LOSS The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the three months ended March 31, 2016 and 2015 , including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss). Three Months Ended March 31, (in millions) 2016 2015 Accumulated net unrealized gains on investment securities: Balance at beginning of period, net of tax $ 9 $ 37 Net unrealized holding gains arising during the period 149 45 Less: Provision for income taxes 55 16 Net unrealized holding gains arising during the period, net of tax 94 29 Less: Net realized losses included in net securities losses — (2 ) Less: Benefit for income taxes — (1 ) Reclassification adjustment for net securities losses included in net income, net of tax — (1 ) Less: Net losses realized as a yield adjustment in interest on investment securities (1 ) (2 ) Less: Benefit for income taxes — (1 ) Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax (1 ) (1 ) Change in net unrealized gains on investment securities, net of tax 95 31 Balance at end of period, net of tax $ 104 $ 68 Accumulated defined benefit pension and other postretirement plans adjustment: Balance at beginning of period, net of tax $ (438 ) $ (449 ) Amortization of actuarial net loss 10 17 Less: Provision for income taxes 4 6 Change in defined benefit pension and other postretirement plans adjustment, net of tax 6 11 Balance at end of period, net of tax $ (432 ) $ (438 ) Total accumulated other comprehensive loss at end of period, net of tax $ (328 ) $ (370 )

Net Income Per Common Share

Net Income Per Common Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Net Income Per Common Share	NET INCOME PER COMMON SHARE Basic and diluted net income per common share are presented in the following table. Three Months Ended March 31, (in millions, except per share data) 2016 2015 Basic and diluted Net income $ 60 $ 134 Less: Income allocated to participating securities 1 2 Net income attributable to common shares $ 59 $ 132 Basic average common shares 173 176 Basic net income per common share $ 0.34 $ 0.75 Basic average common shares 173 176 Dilutive common stock equivalents: Net effect of the assumed exercise of stock options 1 2 Net effect of the assumed exercise of warrants 2 4 Diluted average common shares 176 182 Diluted net income per common share $ 0.34 $ 0.73 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 March 31, (shares in millions) 2016 2015 Average outstanding options 6.9 6.8 Range of exercise prices $37.26 - $59.86 $46.68 - $60.82

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS Net periodic benefit costs are charged to "employee benefits expense" on the consolidated statements of comprehensive income. The components of net periodic benefit cost for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows. Qualified Defined Benefit Pension Plan Three Months Ended March 31, (in millions) 2016 2015 Service cost $ 8 $ 9 Interest cost 23 22 Expected return on plan assets (41 ) (40 ) Amortization of prior service cost 1 1 Amortization of net loss 8 14 Net periodic defined benefit cost $ (1 ) $ 6 Non-Qualified Defined Benefit Pension Plan Three Months Ended March 31, (in millions) 2016 2015 Service cost $ 1 $ 1 Interest cost 2 2 Amortization of prior service credit (1 ) (1 ) Amortization of net loss 2 3 Net periodic defined benefit cost $ 4 $ 5 Postretirement Benefit Plan Three Months Ended March 31, (in millions) 2016 2015 Interest cost $ 1 $ 1 Expected return on plan assets (1 ) (1 ) Net periodic postretirement benefit cost $ — $ — For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2015 Annual Report.

Income Taxes And Tax-Related It

Income Taxes And Tax-Related Items	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes and Tax-Related Items	INCOME TAXES AND TAX-RELATED ITEMS At March 31, 2016 , net unrecognized tax benefits were $15 million , compared to $22 million at December 31, 2015 . The decrease in unrecognized tax benefits of $7 million was primarily due to the recognition of federal settlements. 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 $1 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 both March 31, 2016 and December 31, 2015 . Net deferred tax assets were $173 million at March 31, 2016 , compared to $199 million at December 31, 2015 . The decrease of $26 million in net deferred tax assets resulted primarily from an increase in unrealized gains on investment securities available-for-sale recognized in other comprehensive income and a reversal of deferred tax assets related to expired stock options, partially offset by an increase in the allowance for loan loss. Included in deferred tax assets at both March 31, 2016 and December 31, 2015 were $5 million of state net operating loss carryforwards, which expire between 2016 and 2026 . The Corporation believes that it is more likely than not that the benefit from certain of these state net operating loss carryforwards will not be realized and, accordingly, maintained a valuation allowance of $3 million at both March 31, 2016 and December 31, 2015 . The determination regarding valuation allowance was based on evidence of loss carryback capacity, projected future reversals of existing taxable temporary differences to absorb the deferred tax assets and assumptions made regarding future events. In the ordinary course of business, the Corporation enters into certain transactions that have tax consequences. From time to time, the Internal Revenue Service (IRS) or other tax jurisdictions 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 or other tax jurisdictions, 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.

Contingent Liabilities

Contingent Liabilities	3 Months Ended
	Mar. 31, 2016
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, 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. The Corporation believes it has meritorious defenses to the remaining claims in this case and intends to continue to defend itself vigorously. Management believes that current reserves related to this case are adequate in the event of a negative outcome. 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 March 31, 2016 and 2015 . 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 $31 million at March 31, 2016 . 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 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 .

Business Segment Information

Business Segment Information	3 Months Ended
	Mar. 31, 2016
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. From time to time, the Corporation may make reclassifications among the segments to more appropriately reflect management's current view of the segments, and 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 unit structure and methodologies in effect at March 31, 2016 . Effective January 1, 2016, in conjunction with the effective date for regulatory Liquidity Coverage Ratio (LCR) requirements, the Corporation prospectively implemented an additional funds transfer pricing (FTP) charge, primarily for the cost of maintaining liquid assets to support potential draws on unfunded loan commitments and for the long-term economic cost of holding collateral for secured deposits. For further information about the Corporation's FTP methodology, refer to Note 22 to the consolidated financial statements in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2015. 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 2015 Annual Report. Business segment financial results are as follows: (dollar amounts in millions) Business Retail Wealth Management Finance Other Total Three Months Ended March 31, 2016 Earnings summary: Net interest income (expense) (FTE) $ 365 $ 157 $ 43 $ (121 ) $ 4 $ 448 Provision for credit losses 151 3 (5 ) — (1 ) 148 Noninterest income 135 43 59 14 (5 ) 246 Noninterest expenses 207 179 73 2 (1 ) 460 Provision (benefit) for income taxes (FTE) 47 6 12 (41 ) 2 26 Net income (loss) $ 95 $ 12 $ 22 $ (68 ) $ (1 ) $ 60 Net credit-related charge-offs (recoveries) $ 57 $ 2 $ (1 ) $ — $ — $ 58 Selected average balances: Assets $ 38,635 $ 6,544 $ 5,162 $ 14,186 $ 4,701 $ 69,228 Loans 37,561 5,867 4,964 — — 48,392 Deposits 29,108 23,110 4,171 103 216 56,708 Statistical data: Return on average assets (a) 0.98 % 0.20 % 1.70 % N/M N/M 0.34 % Efficiency ratio (b) 41.41 88.47 71.32 N/M N/M 66.07 (dollar amounts in millions) Business Retail Wealth Management Finance Other Total Three Months Ended March 31, 2015 Earnings summary: Net interest income (expense) (FTE) $ 370 $ 151 $ 43 $ (152 ) $ 2 $ 414 Provision for credit losses 25 (8 ) (1 ) — (2 ) 14 Noninterest income 140 41 58 12 1 252 Noninterest expenses 198 174 77 2 5 456 Provision (benefit) for income taxes (FTE) 98 9 9 (53 ) (1 ) 62 Net income (loss) $ 189 $ 17 $ 16 $ (89 ) $ 1 $ 134 Net credit-related charge-offs (recoveries) $ 9 $ — $ (1 ) $ — $ — $ 8 Selected average balances: Assets $ 38,654 $ 6,368 $ 5,029 $ 12,137 $ 6,547 $ 68,735 Loans 37,623 5,694 4,834 — — 48,151 Deposits 30,143 22,404 3,996 170 277 56,990 Statistical data: Return on average assets (a) 1.95 % 0.30 % 1.29 % N/M N/M 0.78 % Efficiency ratio (b) 38.88 90.57 74.58 N/M N/M 68.37 (a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity. (b) Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains. FTE – Fully Taxable Equivalent N/M – not meaningful The Corporation operates in three primary markets - Texas, California, and Michigan, as well as in Arizona and Florida, with select businesses operating in several other states, and in Canada and Mexico. The Corporation produces market segment results for the Corporation’s three primary geographic markets as well as Other Markets. Other Markets includes Florida, Arizona, the International Finance division and businesses with a national perspective. The Finance & Other category includes the Finance segment and the Other category as previously described. Market segment results are provided as supplemental information to the business segment results and may not meet all operating segment criteria as set forth in GAAP. For comparability purposes, amounts in all periods are based on market segments and methodologies in effect at March 31, 2016 . 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 Finance Total Three Months Ended March 31, 2016 Earnings summary: Net interest income (expense) (FTE) $ 176 $ 179 $ 123 $ 87 $ (117 ) $ 448 Provision for credit losses (6 ) (6 ) 169 (8 ) (1 ) 148 Noninterest income 76 38 30 93 9 246 Noninterest expenses 150 104 100 105 1 460 Provision (benefit) for income taxes (FTE) 36 45 (40 ) 24 (39 ) 26 Net income (loss) $ 72 $ 74 $ (76 ) $ 59 $ (69 ) $ 60 Net credit-related charge-offs (recoveries) $ 5 $ 8 $ 47 $ (2 ) $ — $ 58 Selected average balances: Assets $ 13,402 $ 17,541 $ 11,295 $ 8,103 $ 18,887 $ 69,228 Loans 12,774 17,283 10,763 7,572 — 48,392 Deposits 21,696 16,654 10,374 7,665 319 56,708 Statistical data: Return on average assets (a) 1.27 % 1.68 % (2.52 )% 2.87 % N/M 0.34 % Efficiency ratio (b) 59.31 47.87 65.09 58.09 N/M 66.07 (dollar amounts in millions) Michigan California Texas Other Finance Total Three Months Ended March 31, 2015 Earnings summary: Net interest income (expense) (FTE) $ 177 $ 176 $ 131 $ 80 $ (150 ) $ 414 Provision for credit losses (8 ) (3 ) 21 6 (2 ) 14 Noninterest income 80 36 35 88 13 252 Noninterest expenses 154 97 95 103 7 456 Provision (benefit) for income taxes (FTE) 38 44 18 16 (54 ) 62 Net income (loss) $ 73 $ 74 $ 32 $ 43 $ (88 ) $ 134 Net credit-related charge-offs $ 3 $ 1 $ 3 $ 1 $ — $ 8 Selected average balances: Assets $ 13,736 $ 16,461 $ 12,192 $ 7,662 $ 18,684 $ 68,735 Loans 13,223 16,193 11,535 7,200 — 48,151 Deposits 21,710 16,837 11,010 6,986 447 56,990 Statistical data: Return on average assets (a) 1.30 % 1.63 % 1.01 % 2.26 % N/M 0.78 % Efficiency ratio (b) 60.10 46.11 57.30 60.42 N/M 68.37 (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

Basis of Presentation and Acc21

Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Pending Accounting Pronouncements	Pending Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, “Leases (Topic 842),” (ASU 2016-02), to increase the transparency and comparability of lease recognition and disclosure. The update requires lessees to recognize lease contracts with a term greater than one year on the balance sheet, while recognizing expenses on the income statement in a manner similar to current guidance. For lessors, the update makes targeted changes to the classification criteria and the lessor accounting model to align the guidance with the new lessee model and revenue guidance. ASU 2016-02 is effective for the Corporation on January 1, 2019 and must be applied using the modified retrospective approach. Early adoption is permitted. The Corporation is currently evaluating the impact of adopting ASU 2016-02. In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payments Accounting,” (ASU 2016-09), which intends to simplify accounting for share based payment transactions, including the income tax consequences and classification of awards. Among other items, the update requires excess tax benefits and deficiencies to be recognized as a component of income taxes within the income statement rather than other comprehensive income as required in current guidance. ASU 2016-09 is effective for the Corporation on January 1, 2017. The recognition of excess tax benefits and deficiencies in the income statement must be adopted prospectively. The method of transition required will differ for other items being amended. Early adoption is permitted. The impact to the Corporation upon adoption is dependent on the market value per share of the Corporation's common stock at option expiration dates and restricted stock vesting dates.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Assets And Liabilities Recorded At Fair Value On A Recurring Basis	The following tables present the recorded amount of assets and liabilities measured at fair value on a recurring basis as of March 31, 2016 and December 31, 2015 . (in millions) Total Level 1 Level 2 Level 3 March 31, 2016 Trading securities: Deferred compensation plan assets $ 83 $ 83 $ — $ — Equity and other non-debt securities 3 3 — — Total trading securities 86 86 — — Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities 2,823 2,823 — — Residential mortgage-backed securities (a) 7,591 — 7,591 — State and municipal securities 9 — — 9 (b) Corporate debt securities 1 — — 1 (b) Equity and other non-debt securities 183 132 — 51 (b) Total investment securities available-for-sale 10,607 2,955 7,591 61 Derivative assets: Interest rate contracts 407 — 387 20 Energy derivative contracts 393 — 393 — Foreign exchange contracts 53 — 53 — Warrants 2 — — 2 Total derivative assets 855 — 833 22 Total assets at fair value $ 11,548 $ 3,041 $ 8,424 $ 83 Derivative liabilities: Interest rate contracts $ 169 $ — $ 169 $ — Energy derivative contracts 391 — 391 — Foreign exchange contracts 48 — 48 — Total derivative liabilities 608 — 608 — Deferred compensation plan liabilities 83 83 — — Total liabilities at fair value $ 691 $ 83 $ 608 $ — (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, 2015 Trading securities: Deferred compensation plan assets $ 89 $ 89 $ — $ — Equity and other non-debt securities 3 3 — — Total trading securities 92 92 — — Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities 2,763 2,763 — — Residential mortgage-backed securities (a) 7,545 — 7,545 — State and municipal securities 9 — — 9 (b) Corporate debt securities 1 — — 1 (b) Equity and other non-debt securities 201 134 — 67 (b) Total investment securities available-for-sale 10,519 2,897 7,545 77 Derivative assets: Interest rate contracts 286 — 277 9 Energy derivative contracts 475 — 475 — Foreign exchange contracts 57 — 57 — Warrants 2 — — 2 Total derivative assets 820 — 809 11 Total assets at fair value $ 11,431 $ 2,989 $ 8,354 $ 88 Derivative liabilities: Interest rate contracts $ 92 $ — $ 92 $ — Energy derivative contracts 472 — 472 — Foreign exchange contracts 46 — 46 — Total derivative liabilities 610 — 610 — Deferred compensation plan liabilities 89 89 — — Total liabilities at fair value $ 699 $ 89 $ 610 $ — (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-month periods ended March 31, 2016 and 2015 . Net Realized/Unrealized Gains (Losses) (Pretax) Balance at Beginning of Period Recorded in Earnings Recorded in Other Comprehensive Income (Loss) Balance at End of Period (in millions) Realized Unrealized Sales Three Months Ended March 31, 2016 Investment securities available-for-sale: State and municipal securities (a) $ 9 $ — $ — $ — $ — $ 9 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 67 — — (1 ) (b) (15 ) 51 Total investment securities available-for-sale 77 — — (1 ) (b) (15 ) 61 Derivative assets: Interest rate contracts 9 — 11 (c) — — 20 Warrants 2 — — — — 2 Three Months Ended March 31, 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 ) (d) — 1 (b) (40 ) 71 Total investment securities available-for-sale 136 (2 ) (d) — 1 (b) (40 ) 95 Derivative assets: Interest rate contracts — — 11 (c) — — 11 Warrants 4 — (1 ) (c) — — 3 (a) Auction-rate securities. (b) Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income (loss). (c) Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income. (d) Realized and unrealized gains and losses due to changes in fair value recorded in "net securities losses" 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. The following table presents assets recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 . No liabilities were recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 . (in millions) Total Level 2 Level 3 March 31, 2016 Loans held-for-sale: Commercial $ 7 $ 7 $ — Loans: Commercial 346 — 346 Commercial mortgage 11 — 11 International 27 — 27 Total loans 384 — 384 Other real estate 1 — 1 Total assets at fair value $ 392 $ 7 $ 385 December 31, 2015 Loans held-for-sale: Commercial $ 8 $ 8 $ — Loans: Commercial 134 — 134 Commercial mortgage 11 — 11 International 8 — 8 Total loans 153 — 153 Other real estate 2 — 2 Total assets at fair value excluding investments recorded at net asset value 163 8 155 Other investments recorded at net asset value: Nonmarketable equity securities (a) 1 Total assets at fair value $ 164 (a) Certain investments that are measured at fair value using the net asset value have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
Quantitative Information About Level 3 Measurements	The Corporation's Level 3 recurring fair value measurements primarily include auction-rate securities where fair value is determined using an income approach based on a discounted cash flow model and certain interest rate derivative contracts where credit valuation adjustments are significant to the overall fair value of the derivative. 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 March 31, 2016 workout periods reflect the view that short-term interest rates could rise at a slower pace in 2016 than was expected at December 31, 2015 . Discounted Cash Flow Model Unobservable Input Fair Value (in millions) Discount Rate Workout Period (in years) March 31, 2016 State and municipal securities (a) $ 9 5% - 6% 1 - 3 Equity and other non-debt securities (a) 51 6% - 9% 1 - 2 December 31, 2015 State and municipal securities (a) $ 9 3% - 8% 1 - 2 Equity and other non-debt securities (a) 67 4% - 9% 1 (a) Auction-rate securities.
Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value In Their Entirety On A Recurring Basis	The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis on the Corporation’s consolidated balance sheets are as follows: Carrying Amount Estimated Fair Value (in millions) Total Level 1 Level 2 Level 3 March 31, 2016 Assets Cash and due from banks $ 977 $ 977 $ 977 $ — $ — Interest-bearing deposits with banks 2,025 2,025 2,025 — — Investment securities held-to-maturity 1,907 1,927 — 1,927 — Loans held-for-sale (a) 8 8 — 8 — Total loans, net of allowance for loan losses (b) 48,653 48,588 — — 48,588 Customers’ liability on acceptances outstanding 4 4 4 — — Restricted equity investments 113 113 113 — — Nonmarketable equity securities (c) (d) 10 18 Liabilities Demand deposits (noninterest-bearing) 28,025 28,025 — 28,025 — Interest-bearing deposits 24,925 24,925 — 24,925 — Customer certificates of deposit 3,401 3,390 — 3,390 — Total deposits 56,351 56,340 — 56,340 — Short-term borrowings 514 514 514 — — Acceptances outstanding 4 4 4 — — Medium- and long-term debt 3,109 3,029 — 3,029 — Credit-related financial instruments (83 ) (83 ) — — (83 ) December 31, 2015 Assets Cash and due from banks $ 1,157 $ 1,157 $ 1,157 $ — $ — Interest-bearing deposits with banks 4,990 4,990 4,990 — — Investment securities held-to-maturity 1,981 1,973 — 1,973 — Loans held-for-sale (a) 21 21 — 21 — Total loans, net of allowance for loan losses (b) 48,450 48,269 — — 48,269 Customers’ liability on acceptances outstanding 5 5 5 — — Restricted equity investments 92 92 92 — — Nonmarketable equity securities (c) (d) 10 18 Liabilities Demand deposits (noninterest-bearing) 30,839 30,839 — 30,839 — Interest-bearing deposits 25,462 25,462 — 25,462 — Customer certificates of deposit 3,552 3,536 — 3,536 — Total deposits 59,853 59,837 — 59,837 — Short-term borrowings 23 23 23 — — Acceptances outstanding 5 5 5 — — Medium- and long-term debt 3,058 3,032 — 3,032 — Credit-related financial instruments (83 ) (83 ) — — (83 ) (a) Included $7 million and $8 million impaired loans held-for-sale recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 , respectively. (b) Included $384 million and $153 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015 , respectively. (c) Included $1 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at December 31, 2015 . (d) Certain investments that are measured at fair value using the net asset value have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities $ 2,769 $ 54 $ — $ 2,823 Residential mortgage-backed securities (a) 7,468 135 12 7,591 State and municipal securities 9 — — 9 Corporate debt securities 1 — — 1 Equity and other non-debt securities 183 1 1 183 Total investment securities available-for-sale (b) $ 10,430 $ 190 $ 13 $ 10,607 Investment securities held-to-maturity (c): Residential mortgage-backed securities (a) $ 1,907 $ 20 $ — $ 1,927 December 31, 2015 Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities $ 2,769 $ 1 $ 7 $ 2,763 Residential mortgage-backed securities (a) 7,513 76 44 7,545 State and municipal securities 9 — — 9 Corporate debt securities 1 — — 1 Equity and other non-debt securities 199 2 — 201 Total investment securities available-for-sale (b) $ 10,491 $ 79 $ 51 $ 10,519 Investment securities held-to-maturity (c): Residential mortgage-backed securities (a) $ 1,981 $ 2 $ 10 $ 1,973 (a) 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 $61 million and $60 million , respectively as of March 31, 2016 and $76 million and $77 million , respectively, as of December 31, 2015 . (c) The amortized cost of investment securities held-to-maturity included net unrealized losses of $14 million at March 31, 2016 and $15 million at December 31, 2015 related to securities transferred from 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 March 31, 2016 and December 31, 2015 follows: Temporarily Impaired Less than 12 Months 12 Months or more Total (in millions) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses March 31, 2016 Residential mortgage-backed securities (a) $ 137 $ — $ 1,989 $ 25 $ 2,126 $ 25 State and municipal securities (b) — — 9 — (c) 9 — (c) Corporate debt securities (b) — — 1 — (c) 1 — (c) Equity and other non-debt securities (b) 51 1 — — 51 1 Total temporarily impaired securities $ 188 $ 1 $ 1,999 $ 25 $ 2,187 $ 26 December 31, 2015 U.S. Treasury and other U.S. government agency securities $ 2,265 $ 7 $ — $ — $ 2,265 $ 7 Residential mortgage-backed securities (a) 2,665 21 1,976 51 4,641 72 State and municipal securities (b) — — 9 — (c) 9 — (c) Corporate debt securities (b) — — 1 — (c) 1 — (c) Equity and other non-debt securities (b) 14 — (c) — — 14 — (c) Total temporarily impaired securities $ 4,944 $ 28 $ 1,986 $ 51 $ 6,930 $ 79 (a) Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (b) Primarily auction-rate securities. (c) Unrealized losses less than $0.5 million.
Contractual Maturity Distribution Of Debt Securities	The following table summarizes the amortized cost and fair values of debt securities by contractual maturity. Securities with multiple maturity dates are classified in the period of final maturity. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. (in millions) Available-for-sale Held-to-maturity March 31, 2016 Amortized Cost Fair Value Amortized Cost Fair Value Contractual maturity Within one year $ 10 $ 10 $ — $ — After one year through five years 3,002 3,058 — — After five years through ten years 1,438 1,490 — — After ten years 5,797 5,866 1,907 1,927 Subtotal 10,247 10,424 1,907 1,927 Equity and other non-debt securities 183 183 — — Total investment securities $ 10,430 $ 10,607 $ 1,907 $ 1,927

Credit Quality And Allowance 24

Credit Quality And Allowance For Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 Business loans: Commercial $ 44 $ 19 $ 2 $ 65 $ 547 $ 30,950 $ 31,562 Real estate construction: Commercial Real Estate business line (a) — — — — — 1,947 1,947 Other business lines (b) — 3 — 3 — 340 343 Total real estate construction — 3 — 3 — 2,287 2,290 Commercial mortgage: Commercial Real Estate business line (a) 18 13 — 31 8 2,129 2,168 Other business lines (b) 7 5 2 14 39 6,761 6,814 Total commercial mortgage 25 18 2 45 47 8,890 8,982 Lease financing — — — — 6 725 731 International 10 12 — 22 27 1,406 1,455 Total business loans 79 52 4 135 627 44,258 45,020 Retail loans: Residential mortgage 6 1 9 16 26 1,832 1,874 Consumer: Home equity 5 2 — 7 27 1,704 1,738 Other consumer 1 1 — 2 1 742 745 Total consumer 6 3 — 9 28 2,446 2,483 Total retail loans 12 4 9 25 54 4,278 4,357 Total loans $ 91 $ 56 $ 13 $ 160 $ 681 $ 48,536 $ 49,377 December 31, 2015 Business loans: Commercial $ 46 $ 12 $ 13 $ 71 $ 238 $ 31,350 $ 31,659 Real estate construction: Commercial Real Estate business line (a) 5 — — 5 — 1,676 1,681 Other business lines (b) 3 — — 3 1 316 320 Total real estate construction 8 — — 8 1 1,992 2,001 Commercial mortgage: Commercial Real Estate business line (a) 7 — 1 8 16 2,080 2,104 Other business lines (b) 7 5 3 15 44 6,814 6,873 Total commercial mortgage 14 5 4 23 60 8,894 8,977 Lease financing — — — — 6 718 724 International 2 — — 2 8 1,358 1,368 Total business loans 70 17 17 104 313 44,312 44,729 Retail loans: Residential mortgage 26 1 — 27 27 1,816 1,870 Consumer: Home equity 5 3 — 8 27 1,685 1,720 Other consumer 7 — — 7 — 758 765 Total consumer 12 3 — 15 27 2,443 2,485 Total retail loans 38 4 — 42 54 4,259 4,355 Total loans $ 108 $ 21 $ 17 $ 146 $ 367 $ 48,571 $ 49,084 (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 March 31, 2016 Business loans: Commercial $ 28,295 $ 1,227 $ 1,493 $ 547 $ 31,562 Real estate construction: Commercial Real Estate business line (e) 1,947 — — — 1,947 Other business lines (f) 334 8 1 — 343 Total real estate construction 2,281 8 1 — 2,290 Commercial mortgage: Commercial Real Estate business line (e) 2,104 32 24 8 2,168 Other business lines (f) 6,451 189 135 39 6,814 Total commercial mortgage 8,555 221 159 47 8,982 Lease financing 704 14 7 6 731 International 1,334 41 53 27 1,455 Total business loans 41,169 1,511 1,713 627 45,020 Retail loans: Residential mortgage 1,837 1 10 26 1,874 Consumer: Home equity 1,706 2 3 27 1,738 Other consumer 737 3 4 1 745 Total consumer 2,443 5 7 28 2,483 Total retail loans 4,280 6 17 54 4,357 Total loans $ 45,449 $ 1,517 $ 1,730 $ 681 $ 49,377 December 31, 2015 Business loans: Commercial $ 29,117 $ 1,293 $ 1,011 $ 238 $ 31,659 Real estate construction: Commercial Real Estate business line (e) 1,681 — — — 1,681 Other business lines (f) 318 1 — 1 320 Total real estate construction 1,999 1 — 1 2,001 Commercial mortgage: Commercial Real Estate business line (e) 2,031 31 26 16 2,104 Other business lines (f) 6,536 172 121 44 6,873 Total commercial mortgage 8,567 203 147 60 8,977 Lease financing 693 17 8 6 724 International 1,245 59 56 8 1,368 Total business loans 41,621 1,573 1,222 313 44,729 Retail loans: Residential mortgage 1,828 2 13 27 1,870 Consumer: Home equity 1,687 1 5 27 1,720 Other consumer 755 3 7 — 765 Total consumer 2,442 4 12 27 2,485 Total retail loans 4,270 6 25 54 4,355 Total loans $ 45,891 $ 1,579 $ 1,247 $ 367 $ 49,084 (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-58 in the Corporation's 2015 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities. (e) Primarily loans to real estate developers. (f) Primarily loans secured by owner-occupied real estate.
Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property	The following table summarizes nonperforming assets. (in millions) March 31, 2016 December 31, 2015 Nonaccrual loans $ 681 $ 367 Reduced-rate loans (a) 8 12 Total nonperforming loans 689 379 Foreclosed property (b) 25 12 Total nonperforming assets $ 714 $ 391 (a) There were no reduced-rate business loans at both March 31, 2016 and December 31, 2015 . Reduced-rate retail loans were $8 million and $12 million at March 31, 2016 and December 31, 2015 , respectively. (b) Included $8 million and $9 million of foreclosed residential real estate properties at March 31, 2016 and December 31, 2015 , respectively.
Changes In The Allowance For Loan Losses And Related Loan Amounts	The following table details the changes in the allowance for loan losses and related loan amounts. 2016 2015 (in millions) Business Loans Retail Loans Total Business Loans Retail Loans Total Three Months Ended March 31 Allowance for loan losses: Balance at beginning of period $ 579 $ 55 $ 634 $ 534 $ 60 $ 594 Loan charge-offs (75 ) (2 ) (77 ) (21 ) (2 ) (23 ) Recoveries on loans previously charged-off 24 1 25 12 3 15 Net loan (charge-offs) recoveries (51 ) (1 ) (52 ) (9 ) 1 (8 ) Provision for loan losses 145 (4 ) 141 17 (1 ) 16 Foreign currency translation adjustment 1 — 1 (1 ) — (1 ) Balance at end of period $ 674 $ 50 $ 724 $ 541 $ 60 $ 601 As a percentage of total loans 1.50 % 1.14 % 1.47 % 1.21 % 1.39 % 1.22 % March 31 Allowance for loan losses: Individually evaluated for impairment $ 88 $ — $ 88 $ 31 $ — $ 31 Collectively evaluated for impairment 586 50 636 510 60 570 Total allowance for loan losses $ 674 $ 50 $ 724 $ 541 $ 60 $ 601 Loans: Individually evaluated for impairment $ 755 $ 27 $ 782 $ 169 $ 37 $ 206 Collectively evaluated for impairment 44,265 4,330 48,595 44,622 4,242 48,864 Purchased credit impaired (PCI) loans (a) — — — — 2 2 Total loans evaluated for impairment $ 45,020 $ 4,357 $ 49,377 $ 44,791 $ 4,281 $ 49,072 (a) No allowance for loan losses was required for PCI loans at March 31, 2016 and 2015.
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 othe r liabilities" on the consolidated balance sheets, are summarized in the following table. Three Months Ended March 31, (in millions) 2016 2015 Balance at beginning of period $ 45 $ 41 Charge-offs on lending related commitments (a) (6 ) — Provision for credit losses on lending-related commitments 7 (2 ) Balance at end of period $ 46 $ 39 (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 March 31, 2016 Business loans: Commercial $ 106 $ 583 $ 689 $ 778 $ 80 Commercial mortgage: Commercial Real Estate business line (a) — 8 8 15 1 Other business lines (b) — 31 31 46 5 Total commercial mortgage — 39 39 61 6 International — 27 27 35 2 Total business loans 106 649 755 874 88 Retail loans: Residential mortgage 12 — 12 12 — Consumer: Home equity 12 — 12 12 — Other consumer 3 — 3 3 — Total consumer 15 — 15 15 — Total retail loans (c) 27 — 27 27 — Total individually evaluated impaired loans $ 133 $ 649 $ 782 $ 901 $ 88 December 31, 2015 Business loans: Commercial $ 82 $ 252 $ 334 $ 398 $ 45 Commercial mortgage: Commercial Real Estate business line (a) 7 8 15 38 1 Other business lines (b) 2 32 34 55 5 Total commercial mortgage 9 40 49 93 6 International — 10 10 17 2 Total business loans 91 302 393 508 53 Retail loans: Residential mortgage 13 — 13 13 — Consumer: Home equity 12 — 12 16 — Other consumer 6 — 6 10 — Total consumer 18 — 18 26 — Total retail loans (c) 31 — 31 39 — Total individually evaluated impaired loans $ 122 $ 302 $ 424 $ 547 $ 53 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate. (c) Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy which results 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 2016 2015 (in millions) Average Balance for the Period Interest Income Recognized for the Period Average Balance for the Period Interest Income Recognized for the Period Three Months Ended March 31 Business loans: Commercial $ 511 $ 4 $ 109 $ 1 Commercial mortgage: Commercial Real Estate business line (a) 11 — 19 — Other business lines (b) 33 — 44 — Total commercial mortgage 44 — 63 — International 19 — 1 — Total business loans 574 4 173 1 Retail loans: Residential mortgage 12 — 23 — Consumer loans: Home equity 12 — 12 — Other consumer 5 — 4 — Total consumer 17 — 16 — Total retail loans 29 — 39 — Total individually evaluated impaired loans $ 603 $ 4 $ 212 $ 1 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate.
Troubled Debt Restructurings By Type Of Modification	The following tables detail the recorded balance at March 31, 2016 and 2015 of loans considered to be TDRs that were restructured during the three-month periods ended March 31, 2016 and 2015 , 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. 2016 2015 Type of Modification (in millions) Principal Deferrals (a) Interest Rate Reductions AB Note Restructures (b) Total Modifications Principal Deferrals (a) Three Months Ended March 31 Business loans: Commercial $ 144 $ — $ 16 $ 160 $ — Commercial mortgage: Other business lines (c) 1 — — 1 3 International — — 11 11 — Total business loans 145 — 27 172 3 Retail loans: Residential mortgage — 2 — 2 — Total loans $ 145 $ 2 $ 27 $ 174 $ 3 (a) Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates. (b) Loan restructurings whereby the original loan is restructured into two notes: an "A" note, which generally reflects the portion of the modified loan which is expected to be collected; and a "B" note, which is either fully charged off or exchanged for an equity interest. (c) Primarily loans secured by owner-occupied real estate.
Troubled Debt Restructuring Subsequent Default	The following table presents information regarding the recorded balance at March 31, 2016 and 2015 of loans modified by principal deferral during the twelve-month periods ended March 31, 2016 and 2015 , and those principal deferrals which experienced a subsequent default during the three-month periods ended March 31, 2016 and 2015 . 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. 2016 2015 (in millions) Balance at March 31 Subsequent Default in the Three Months Ended March 31 Balance at March 31 Subsequent Default in the Three Months Ended March 31 Principal deferrals: Business loans: Commercial $ 281 $ 1 $ 20 $ 15 Commercial mortgage: Commercial Real Estate business line (a) 8 6 — — Other business lines (b) 3 — 9 1 Total commercial mortgage 11 6 9 1 International 1 — — — Total business loans 293 7 29 16 Retail loans: Residential mortgage — — 1 (c) — Consumer: Home equity 1 (c) — 1 (c) — Total retail loans 1 — 2 — Total principal deferrals $ 294 $ 7 $ 31 $ 16 (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.

Derivative And Credit-Related25

Derivative And Credit-Related Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 . The table excludes commitments and warrants accounted for as derivatives. March 31, 2016 December 31, 2015 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 $ 2,525 $ 193 $ — $ 2,525 $ 147 $ — Derivatives used as economic hedges Foreign exchange contracts: Spot, forwards and swaps 785 1 5 593 3 — Total risk management purposes 3,310 194 5 3,118 150 — Customer-initiated and other activities Interest rate contracts: Caps and floors written 273 — — 253 — — Caps and floors purchased 273 — — 253 — — Swaps 12,286 214 169 11,722 139 92 Total interest rate contracts 12,832 214 169 12,228 139 92 Energy contracts: Caps and floors written 417 — 57 536 — 85 Caps and floors purchased 417 57 — 536 85 — Swaps 1,786 336 334 2,055 390 387 Total energy contracts 2,620 393 391 3,127 475 472 Foreign exchange contracts: Spot, forwards, options and swaps 2,444 52 43 2,291 54 46 Total customer-initiated and other activities 17,896 659 603 17,646 668 610 Total gross derivatives $ 21,206 853 608 $ 20,764 818 610 Amounts offset in the consolidated balance sheets: Netting adjustment - Offsetting derivative assets/liabilities (118 ) (118 ) (127 ) (127 ) Netting adjustment - Cash collateral received/posted (256 ) (6 ) (291 ) (3 ) Net derivatives included in the consolidated balance sheets (b) 479 484 400 480 Amounts not offset in the consolidated balance sheets: Marketable securities pledged under bilateral collateral agreements (90 ) (28 ) (137 ) (3 ) Net derivatives after deducting amounts not offset in the consolidated balance sheets $ 389 $ 456 $ 263 $ 477 (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 $10 million and $5 million at March 31, 2016 and December 31, 2015 , respectively.
Schedule Of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps	The following table summarizes the expected weighted average remaining maturity of the notional amount of risk management interest rate swaps and the weighted average interest rates associated with amounts expected to be received or paid on interest rate swap agreements as of March 31, 2016 and December 31, 2015 . Weighted Average (dollar amounts in millions) Notional Amount Remaining Maturity (in years) Receive Rate Pay Rate (a) March 31, 2016 Swaps - fair value - receive fixed/pay floating rate Medium- and long-term debt designation $ 2,525 4.8 3.89 % 1.29 % December 31, 2015 Swaps - fair value - receive fixed/pay floating rate Medium- and long-term debt designation 2,525 5.1 3.89 1.11 (a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at March 31, 2016 and December 31, 2015 .
Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives	The net gains recognized in income on customer-initiated derivative instruments, net of the impact of offsetting positions, were as follows . Three Months Ended March 31, (in millions) Location of Gain 2016 2015 Interest rate contracts Other noninterest income $ 2 $ 2 Energy contracts Other noninterest income — 1 Foreign exchange contracts Foreign exchange income 10 10 Total $ 12 $ 13
Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk	The Corporation’s credit risk associated with these instruments is represented by the contractual amounts indicated in the following table. (in millions) March 31, 2016 December 31, 2015 Unused commitments to extend credit: Commercial and other $ 25,032 $ 26,115 Bankcard, revolving check credit and home equity loan commitments 2,468 2,414 Total unused commitments to extend credit $ 27,500 $ 28,529 Standby letters of credit $ 3,949 $ 3,985 Commercial letters of credit 61 41
Summary Of Criticized Letters Of Credit	The following table presents a summary of criticized standby and commercial letters of credit at March 31, 2016 and December 31, 2015 . The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines. (dollar amounts in millions) March 31, 2016 December 31, 2015 Total criticized standby and commercial letters of credit $ 135 $ 110 As a percentage of total outstanding standby and commercial letters of credit 3.4 % 2.7 %

Variable Interest Entities (V26

Variable Interest Entities (VIEs) (Tables)	3 Months Ended
	Mar. 31, 2016
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Impact Of VIEs On The Consolidated Statements Of Comprehensive Income	The following table summarizes the impact of these tax credit entities on line items on the Corporation’s consolidated statements of comprehensive income. Three Months Ended March 31, (in millions) 2016 2015 Other noninterest income: Amortization of other tax credit investments $ — $ 1 Provision for income taxes: Amortization of LIHTC investments 16 15 Low income housing tax credits (16 ) (15 ) Other tax benefits related to tax credit entities (6 ) (5 ) Total provision for income taxes $ (6 ) $ (5 )

Medium- And Long-Term Debt (Tab

Medium- And Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Schedule Of Medium- And Long-Term Debt	Medium- and long-term debt is summarized as follows: (in millions) March 31, 2016 December 31, 2015 Parent company Subordinated notes: 3.80% subordinated notes due 2026 (a) 272 259 Medium-term notes: 2.125% notes due 2019 (a) 354 349 Total parent company 626 608 Subsidiaries Subordinated notes: 5.75% subordinated notes due 2016 (a) (b) 657 659 5.20% subordinated notes due 2017 (a) 527 530 4.00% subordinated notes due 2025 (a) 367 351 7.875% subordinated notes due 2026 (a) 231 223 Total subordinated notes 1,782 1,763 Medium-term notes: 2.50% notes due 2020 (a) 685 671 Other notes: 6.0% - 6.4% fixed-rate notes due 2020 16 16 Total subsidiaries 2,483 2,450 Total medium- and long-term debt $ 3,109 $ 3,058 (a) The fixed interest rates on these notes have been swapped to a variable rate and designated in a hedging relationship. Accordingly, carrying value has been adjusted to reflect the change in the fair value of the debt as a result of changes in the benchmark rate. (b) The fixed interest rate on $250 million of $600 million total par value of these notes have been swapped to a variable rate.

Accumulated Other Comprehensi28

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Loss	The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the three months ended March 31, 2016 and 2015 , including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss). Three Months Ended March 31, (in millions) 2016 2015 Accumulated net unrealized gains on investment securities: Balance at beginning of period, net of tax $ 9 $ 37 Net unrealized holding gains arising during the period 149 45 Less: Provision for income taxes 55 16 Net unrealized holding gains arising during the period, net of tax 94 29 Less: Net realized losses included in net securities losses — (2 ) Less: Benefit for income taxes — (1 ) Reclassification adjustment for net securities losses included in net income, net of tax — (1 ) Less: Net losses realized as a yield adjustment in interest on investment securities (1 ) (2 ) Less: Benefit for income taxes — (1 ) Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax (1 ) (1 ) Change in net unrealized gains on investment securities, net of tax 95 31 Balance at end of period, net of tax $ 104 $ 68 Accumulated defined benefit pension and other postretirement plans adjustment: Balance at beginning of period, net of tax $ (438 ) $ (449 ) Amortization of actuarial net loss 10 17 Less: Provision for income taxes 4 6 Change in defined benefit pension and other postretirement plans adjustment, net of tax 6 11 Balance at end of period, net of tax $ (432 ) $ (438 ) Total accumulated other comprehensive loss at end of period, net of tax $ (328 ) $ (370 )

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Basic And Diluted Net Income Per Common Share	Basic and diluted net income per common share are presented in the following table. Three Months Ended March 31, (in millions, except per share data) 2016 2015 Basic and diluted Net income $ 60 $ 134 Less: Income allocated to participating securities 1 2 Net income attributable to common shares $ 59 $ 132 Basic average common shares 173 176 Basic net income per common share $ 0.34 $ 0.75 Basic average common shares 173 176 Dilutive common stock equivalents: Net effect of the assumed exercise of stock options 1 2 Net effect of the assumed exercise of warrants 2 4 Diluted average common shares 176 182 Diluted net income per common share $ 0.34 $ 0.73
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 March 31, (shares in millions) 2016 2015 Average outstanding options 6.9 6.8 Range of exercise prices $37.26 - $59.86 $46.68 - $60.82

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Components of Net Periodic Benefit Cost	The components of net periodic benefit cost for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows. Qualified Defined Benefit Pension Plan Three Months Ended March 31, (in millions) 2016 2015 Service cost $ 8 $ 9 Interest cost 23 22 Expected return on plan assets (41 ) (40 ) Amortization of prior service cost 1 1 Amortization of net loss 8 14 Net periodic defined benefit cost $ (1 ) $ 6 Non-Qualified Defined Benefit Pension Plan Three Months Ended March 31, (in millions) 2016 2015 Service cost $ 1 $ 1 Interest cost 2 2 Amortization of prior service credit (1 ) (1 ) Amortization of net loss 2 3 Net periodic defined benefit cost $ 4 $ 5 Postretirement Benefit Plan Three Months Ended March 31, (in millions) 2016 2015 Interest cost $ 1 $ 1 Expected return on plan assets (1 ) (1 ) Net periodic postretirement benefit cost $ — $ —

Business Segment Information (T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Business Segment Financial Results	Business segment financial results are as follows: (dollar amounts in millions) Business Retail Wealth Management Finance Other Total Three Months Ended March 31, 2016 Earnings summary: Net interest income (expense) (FTE) $ 365 $ 157 $ 43 $ (121 ) $ 4 $ 448 Provision for credit losses 151 3 (5 ) — (1 ) 148 Noninterest income 135 43 59 14 (5 ) 246 Noninterest expenses 207 179 73 2 (1 ) 460 Provision (benefit) for income taxes (FTE) 47 6 12 (41 ) 2 26 Net income (loss) $ 95 $ 12 $ 22 $ (68 ) $ (1 ) $ 60 Net credit-related charge-offs (recoveries) $ 57 $ 2 $ (1 ) $ — $ — $ 58 Selected average balances: Assets $ 38,635 $ 6,544 $ 5,162 $ 14,186 $ 4,701 $ 69,228 Loans 37,561 5,867 4,964 — — 48,392 Deposits 29,108 23,110 4,171 103 216 56,708 Statistical data: Return on average assets (a) 0.98 % 0.20 % 1.70 % N/M N/M 0.34 % Efficiency ratio (b) 41.41 88.47 71.32 N/M N/M 66.07 (dollar amounts in millions) Business Retail Wealth Management Finance Other Total Three Months Ended March 31, 2015 Earnings summary: Net interest income (expense) (FTE) $ 370 $ 151 $ 43 $ (152 ) $ 2 $ 414 Provision for credit losses 25 (8 ) (1 ) — (2 ) 14 Noninterest income 140 41 58 12 1 252 Noninterest expenses 198 174 77 2 5 456 Provision (benefit) for income taxes (FTE) 98 9 9 (53 ) (1 ) 62 Net income (loss) $ 189 $ 17 $ 16 $ (89 ) $ 1 $ 134 Net credit-related charge-offs (recoveries) $ 9 $ — $ (1 ) $ — $ — $ 8 Selected average balances: Assets $ 38,654 $ 6,368 $ 5,029 $ 12,137 $ 6,547 $ 68,735 Loans 37,623 5,694 4,834 — — 48,151 Deposits 30,143 22,404 3,996 170 277 56,990 Statistical data: Return on average assets (a) 1.95 % 0.30 % 1.29 % N/M N/M 0.78 % Efficiency ratio (b) 38.88 90.57 74.58 N/M N/M 68.37 (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 Finance Total Three Months Ended March 31, 2016 Earnings summary: Net interest income (expense) (FTE) $ 176 $ 179 $ 123 $ 87 $ (117 ) $ 448 Provision for credit losses (6 ) (6 ) 169 (8 ) (1 ) 148 Noninterest income 76 38 30 93 9 246 Noninterest expenses 150 104 100 105 1 460 Provision (benefit) for income taxes (FTE) 36 45 (40 ) 24 (39 ) 26 Net income (loss) $ 72 $ 74 $ (76 ) $ 59 $ (69 ) $ 60 Net credit-related charge-offs (recoveries) $ 5 $ 8 $ 47 $ (2 ) $ — $ 58 Selected average balances: Assets $ 13,402 $ 17,541 $ 11,295 $ 8,103 $ 18,887 $ 69,228 Loans 12,774 17,283 10,763 7,572 — 48,392 Deposits 21,696 16,654 10,374 7,665 319 56,708 Statistical data: Return on average assets (a) 1.27 % 1.68 % (2.52 )% 2.87 % N/M 0.34 % Efficiency ratio (b) 59.31 47.87 65.09 58.09 N/M 66.07 (dollar amounts in millions) Michigan California Texas Other Finance Total Three Months Ended March 31, 2015 Earnings summary: Net interest income (expense) (FTE) $ 177 $ 176 $ 131 $ 80 $ (150 ) $ 414 Provision for credit losses (8 ) (3 ) 21 6 (2 ) 14 Noninterest income 80 36 35 88 13 252 Noninterest expenses 154 97 95 103 7 456 Provision (benefit) for income taxes (FTE) 38 44 18 16 (54 ) 62 Net income (loss) $ 73 $ 74 $ 32 $ 43 $ (88 ) $ 134 Net credit-related charge-offs $ 3 $ 1 $ 3 $ 1 $ — $ 8 Selected average balances: Assets $ 13,736 $ 16,461 $ 12,192 $ 7,662 $ 18,684 $ 68,735 Loans 13,223 16,193 11,535 7,200 — 48,151 Deposits 21,710 16,837 11,010 6,986 447 56,990 Statistical data: Return on average assets (a) 1.30 % 1.63 % 1.01 % 2.26 % N/M 0.78 % Efficiency ratio (b) 60.10 46.11 57.30 60.42 N/M 68.37 (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

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Recurring
Transfers into or out of Level 1 or Level 2 or Level 3	$ 0	$ 0
Total liabilities at fair value	691		$ 699
Nonrecurring
Total liabilities at fair value	$ 0		$ 0

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	[1]	$ 10,607	$ 10,519
Derivative assets		853	818
Derivative liabilities	[2]	484	480
Equity and other non-debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		183	201
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		2,823	2,763
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		1	1
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		86	92
Investment securities available-for-sale		10,607	10,519
Derivative assets		855	820
Total assets at fair value		11,548	11,431
Derivative liabilities		608	610
Deferred compensation plan liabilities		83	89
Total liabilities at fair value		691	699
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		86	92
Investment securities available-for-sale		2,955	2,897
Derivative assets		0	0
Total assets at fair value		3,041	2,989
Derivative liabilities		0	0
Deferred compensation plan liabilities		83	89
Total liabilities at fair value		83	89
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Investment securities available-for-sale		7,591	7,545
Derivative assets		833	809
Total assets at fair value		8,424	8,354
Derivative liabilities		608	610
Deferred compensation plan liabilities		0	0
Total liabilities at fair value		608	610
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Investment securities available-for-sale		61	77
Derivative assets		22	11
Total assets at fair value		83	88
Derivative liabilities		0	0
Deferred compensation plan liabilities		0	0
Total liabilities at fair value		0	0
Recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		407	286
Derivative liabilities		169	92
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		387	277
Derivative liabilities		169	92
Recurring | Interest rate contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		20	9
Derivative liabilities		0	0
Recurring | Energy derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		393	475
Derivative liabilities		391	472
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		393	475
Derivative liabilities		391	472
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		53	57
Derivative liabilities		48	46
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		53	57
Derivative liabilities		48	46
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		2	2
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		2	2
Recurring | Deferred compensation plan assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		83	89
Recurring | Deferred compensation plan assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		83	89
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		3	3
Investment securities available-for-sale		183	201
Recurring | Equity and other non-debt securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		3	3
Investment securities available-for-sale		132	134
Recurring | Equity and other non-debt securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Investment securities available-for-sale		0	0
Recurring | Equity and other non-debt securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
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		2,823	2,763
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		2,823	2,763
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	[3]	7,591	7,545
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	[3]	0	0
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	[3]	7,591	7,545
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	[3]	0	0
Recurring | State and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		9	9
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 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		1	1
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		0	0
Recurring | Corporate debt securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	[4]	$ 1	$ 1
[1]	Included auction-rate securities at amortized cost and fair value of $61 million and $60 million, respectively as of March 31, 2016 and $76 million and $77 million, respectively, as of December 31, 2015.
[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 $10 million and $5 million at March 31, 2016 and December 31, 2015, 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.

Fair Value Measurements (Change

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
		Mar. 31, 2016	Mar. 31, 2015
Interest rate contracts
Balance at Beginning of Period		$ 9	$ 0
Realized Gains (Losses) Recorded in Earnings		0	0
Unrealized Gains (Losses) Recorded in Earnings	[1]	11	11
Gains (Losses) Recorded in Other Comprehensive Income (Loss)		0	0
Sales		0	0
Balance at End of Period		20	11
Warrants
Balance at Beginning of Period		2	4
Realized Gains (Losses) Recorded in Earnings		0	0
Unrealized Gains (Losses) Recorded in Earnings		0	(1)	[1]
Gains (Losses) Recorded in Other Comprehensive Income (Loss)		0	0
Sales		0	0
Balance at End of Period		2	3
Investment securities available-for-sale
Balance at Beginning of Period		77	136
Realized Gains (Losses) Recorded in Earnings		0	(2)	[2]
Unrealized Gains (Losses) Recorded in Earnings		0	0
Gains (Losses) Recorded in Other Comprehensive Income (Loss)	[3]	(1)	1
Sales		(15)	(40)
Balance at End of Period		61	95
State and municipal securities | Investment securities available-for-sale
Balance at Beginning of Period	[4]	9	23
Realized Gains (Losses) Recorded in Earnings	[4]	0	0
Unrealized Gains (Losses) Recorded in Earnings	[4]	0	0
Gains (Losses) Recorded in Other Comprehensive Income (Loss)	[4]	0	0
Sales	[4]	0	0
Balance at End of Period	[4]	9	23
Corporate debt securities | Investment securities available-for-sale
Balance at Beginning of Period	[4]	1	1
Realized Gains (Losses) Recorded in Earnings	[4]	0	0
Unrealized Gains (Losses) Recorded in Earnings	[4]	0	0
Gains (Losses) Recorded in Other Comprehensive Income (Loss)	[4]	0	0
Sales	[4]	0	0
Balance at End of Period	[4]	1	1
Equity and other non-debt securities | Investment securities available-for-sale
Balance at Beginning of Period	[4]	67	112
Realized Gains (Losses) Recorded in Earnings	[4]	0	(2)	[2]
Unrealized Gains (Losses) Recorded in Earnings	[4]	0	0
Gains (Losses) Recorded in Other Comprehensive Income (Loss)	[3],[4]	(1)	1
Sales	[4]	(15)	(40)
Balance at End of Period	[4]	$ 51	$ 71
[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 losses" on the consolidated statements of comprehensive income.
[3]	Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income (loss).
[4]	Auction-rate securities.

Fair Value Measurements (Asse35

Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) - Nonrecurring - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		$ 384	$ 153
Other real estate		1	2
Total assets at fair value excluding investments recorded at net asset value			163
Nonmarketable equity securities	[1]		1
Total assets at fair value		392	164
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		0	0
Other real estate		0	0
Total assets at fair value		7	8
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		384	153
Other real estate		1	2
Total assets at fair value		385	155
Commercial borrower | Domestic loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale		7	8
Loans		346	134
Commercial borrower | Domestic loans | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale		7	8
Loans		0	0
Commercial borrower | Domestic loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale		0	0
Loans		346	134
Commercial borrower | International loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		27	8
Commercial borrower | International loans | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		0	0
Commercial borrower | International loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		27	8
Commercial borrower | Commercial mortgage loans | Domestic loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		11	11
Commercial borrower | Commercial mortgage loans | Domestic loans | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		0	0
Commercial borrower | Commercial mortgage loans | Domestic loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans		$ 11	$ 11
[1]	Certain investments that are measured at fair value using the net asset value have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Information About Level 3 Measurements) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	[1]	$ 10,607	$ 10,519
Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale		10,607	10,519
Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale		61	77
Recurring | State and municipal securities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	[2]	$ 9	$ 9
Recurring | State and municipal securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable input, discount rate	[2]	5.00%	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]	6.00%	8.00%
Unobservable input, workout period	[2]	3 years	2 years
Recurring | Equity and other non-debt securities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	[2]	$ 51	$ 67
Recurring | Equity and other non-debt securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable input, discount rate	[2]	6.00%	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]	9.00%	9.00%
Unobservable input, workout period	[2]	2 years	1 year
[1]	Included auction-rate securities at amortized cost and fair value of $61 million and $60 million, respectively as of March 31, 2016 and $76 million and $77 million, respectively, as of December 31, 2015.
[2]	Auction-rate securities.

Fair Value Measurements (Estima

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		Mar. 31, 2016	Dec. 31, 2015
Cash and due from banks		$ 977	$ 1,157
Interest-bearing deposits with banks		2,025	4,990
Investment securities held-to-maturity		1,907	1,981
Total loans, net of allowance for loan losses		48,653	48,450
Demand deposits (noninterest-bearing)		28,025	30,839
Customer certificates of deposit		3,401	3,552
Total deposits		56,351	59,853
Short-term borrowings		514	23
Medium- and long-term debt		3,109	3,058
Carrying amount
Cash and due from banks		977	1,157
Interest-bearing deposits with banks		2,025	4,990
Investment securities held-to-maturity		1,907	1,981
Loans held-for-sale	[1]	8	21
Total loans, net of allowance for loan losses	[2]	48,653	48,450
Customers' liability on acceptances outstanding		4	5
Restricted equity investments		113	92
Nonmarketable equity securities	[3],[4]	10	10
Demand deposits (noninterest-bearing)		28,025	30,839
Interest-bearing deposits		24,925	25,462
Customer certificates of deposit		3,401	3,552
Total deposits		56,351	59,853
Short-term borrowings		514	23
Acceptances outstanding		4	5
Medium- and long-term debt		3,109	3,058
Credit-related financial instruments		(83)	(83)
Estimated fair value
Cash and due from banks		977	1,157
Interest-bearing deposits with banks		2,025	4,990
Investment securities held-to-maturity		1,927	1,973
Loans held-for-sale	[1]	8	21
Total loans, net of allowance for loan losses	[2]	48,588	48,269
Customers' liability on acceptances outstanding		4	5
Restricted equity investments		113	92
Nonmarketable equity securities	[3],[4]	18	18
Demand deposits (noninterest-bearing)		28,025	30,839
Interest-bearing deposits		24,925	25,462
Customer certificates of deposit		3,390	3,536
Total deposits		56,340	59,837
Short-term borrowings		514	23
Acceptances outstanding		4	5
Medium- and long-term debt		3,029	3,032
Credit-related financial instruments		(83)	(83)
Level 1 | Estimated fair value
Cash and due from banks		977	1,157
Interest-bearing deposits with banks		2,025	4,990
Investment securities held-to-maturity		0	0
Loans held-for-sale	[1]	0	0
Total loans, net of allowance for loan losses	[2]	0	0
Customers' liability on acceptances outstanding		4	5
Restricted equity investments		113	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		514	23
Acceptances outstanding		4	5
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		1,927	1,973
Loans held-for-sale	[1]	8	21
Total loans, net of allowance for loan losses	[2]	0	0
Customers' liability on acceptances outstanding		0	0
Restricted equity investments		0	0
Demand deposits (noninterest-bearing)		28,025	30,839
Interest-bearing deposits		24,925	25,462
Customer certificates of deposit		3,390	3,536
Total deposits		56,340	59,837
Short-term borrowings		0	0
Acceptances outstanding		0	0
Medium- and long-term debt		3,029	3,032
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	[1]	0	0
Total loans, net of allowance for loan losses	[2]	48,588	48,269
Customers' liability on acceptances outstanding		0	0
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		(83)	(83)
Nonrecurring
Nonmarketable equity securities	[5]		1
Nonrecurring | Level 2
Loans held-for-sale		7	8
Nonrecurring | Level 3
Total loans, net of allowance for loan losses		$ 384	$ 153
[1]	Included $7 million and $8 million impaired loans held-for-sale recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015, respectively.
[2]	Included $384 million and $153 million of impaired loans recorded at fair value on a nonrecurring basis at March 31, 2016 and December 31, 2015, respectively.
[3]	Certain investments that are measured at fair value using the net asset value have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
[4]	Included $1 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at December 31, 2015.
[5]	Certain investments that are measured at fair value using the net asset value have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Millions		3 Months Ended
		Mar. 31, 2016USD ($)Security	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Securities with no credit impairment in unrealized loss position | Security		109
Securities gains		$ 0	$ 0
Securities losses		2	$ 2
Investment securities available-for-sale, Amortized Cost	[1]	10,430		$ 10,491
Investment securities available-for-sale, Fair Value	[1]	10,607		10,519
Investment securities held-to-maturity, Amortized Cost		1,907		1,981
Investment securities held-to-maturity, Fair Value		1,927
Carrying value of securities pledged		1,800
Liabilities secured by pledged collateral		$ 1,200
Residential mortgage-backed securities
Securities with no credit impairment in unrealized loss position | Security		63
Investment securities available-for-sale, Amortized Cost	[2]	$ 7,468		7,513
Investment securities available-for-sale, Fair Value	[2]	7,591		7,545
Investment securities held-to-maturity, Amortized Cost	[2],[3]	1,907		1,981
Investment securities held-to-maturity, Fair Value	[2],[3]	$ 1,927		1,973
Auction-Rate State And Municipal Securities
Securities with no credit impairment in unrealized loss position		16
Auction-Rate Corporate Debt Securities
Securities with no credit impairment in unrealized loss position | Security		1
Auction Rate Preferred Securities
Securities with no credit impairment in unrealized loss position		29
Auction-rate securities
ARS portfolio redeemed or sold since acquisition		95.00%
ARS portfolio redeemed or sold since acquisition at or above cost		90.00%
Investment securities available-for-sale, Amortized Cost		$ 61		76
Investment securities available-for-sale, Fair Value		60		$ 77
Prepayment options | Residential mortgage-backed securities
Investment securities available-for-sale, Amortized Cost		7,500
Investment securities available-for-sale, Fair Value		7,600
Investment securities held-to-maturity, Amortized Cost		1,900
Investment securities held-to-maturity, Fair Value		$ 1,900
[1]	Included auction-rate securities at amortized cost and fair value of $61 million and $60 million, respectively as of March 31, 2016 and $76 million and $77 million, respectively, as of December 31, 2015.
[2]	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 $14 million at March 31, 2016 and $15 million at December 31, 2015 related to securities transferred from available-for-sale, which are included in accumulated other comprehensive loss.

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities Available-For-Sale) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Investment securities available-for-sale, Amortized Cost	[1]	$ 10,430	$ 10,491
Investment securities available-for-sale securities, Gross Unrealized Gains	[1]	190	79
Investment securities available-for-sale securities, Gross Unrealized Losses	[1]	13	51
Investment securities available-for-sale, Fair Value	[1]	10,607	10,519
Investment securities held-to-maturity, Amortized Cost		1,907	1,981
Investment securities held-to-maturity, Fair Value		1,927
Net unrealized losses on available-for-sale securities transferred to held-to-maturity		14	15
U.S. Treasury and other U.S. government agency securities
Investment securities available-for-sale, Amortized Cost		2,769	2,769
Investment securities available-for-sale securities, Gross Unrealized Gains		54	1
Investment securities available-for-sale securities, Gross Unrealized Losses		0	7
Investment securities available-for-sale, Fair Value		2,823	2,763
Residential mortgage-backed securities
Investment securities available-for-sale, Amortized Cost	[2]	7,468	7,513
Investment securities available-for-sale securities, Gross Unrealized Gains	[2]	135	76
Investment securities available-for-sale securities, Gross Unrealized Losses	[2]	12	44
Investment securities available-for-sale, Fair Value	[2]	7,591	7,545
Investment securities held-to-maturity, Amortized Cost	[2],[3]	1,907	1,981
Investment securities held-to-maturity, Gross Unrealized Gains	[2],[3]	20	2
Investment securities held-to-maturity, Gross Unrealized Losses	[2],[3]	0	10
Investment securities held-to-maturity, Fair Value	[2],[3]	1,927	1,973
State and municipal securities
Investment securities available-for-sale, Amortized Cost		9	9
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		9	9
Corporate debt securities
Investment securities available-for-sale, Amortized Cost		1	1
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		1	1
Equity and other non-debt securities
Investment securities available-for-sale, Amortized Cost		183	199
Investment securities available-for-sale securities, Gross Unrealized Gains		1	2
Investment securities available-for-sale securities, Gross Unrealized Losses		1	0
Investment securities available-for-sale, Fair Value		183	201
Auction-rate securities
Investment securities available-for-sale, Amortized Cost		61	76
Investment securities available-for-sale, Fair Value		$ 60	$ 77
[1]	Included auction-rate securities at amortized cost and fair value of $61 million and $60 million, respectively as of March 31, 2016 and $76 million and $77 million, respectively, as of December 31, 2015.
[2]	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 $14 million at March 31, 2016 and $15 million at December 31, 2015 related to securities transferred from available-for-sale, which are included in accumulated other comprehensive loss.

Investment Securities (Summar40

Investment Securities (Summary Of Investment Securities Available-For-Sale In Unrealized Loss Positions) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Temporarily Impaired Less than 12 months, Fair Value		$ 188	$ 4,944
Temporarily Impaired Less than 12 Months, Unrealized Losses		1	28
Temporarily Impaired 12 months or more, Fair Value		1,999	1,986
Temporarily Impaired 12 Months or more, Unrealized Losses		25	51
Temporarily Impaired Total, Fair Value		2,187	6,930
Temporarily Impaired Total, Unrealized Losses		26	79
U.S. Treasury and other U.S. government agency securities
Temporarily Impaired Less than 12 months, Fair Value			2,265
Temporarily Impaired Less than 12 Months, Unrealized Losses			7
Temporarily Impaired 12 months or more, Fair Value			0
Temporarily Impaired 12 Months or more, Unrealized Losses			0
Temporarily Impaired Total, Fair Value			2,265
Temporarily Impaired Total, Unrealized Losses			7
Residential mortgage-backed securities
Temporarily Impaired Less than 12 months, Fair Value	[1]	137	2,665
Temporarily Impaired Less than 12 Months, Unrealized Losses	[1]	0	21
Temporarily Impaired 12 months or more, Fair Value	[1]	1,989	1,976
Temporarily Impaired 12 Months or more, Unrealized Losses	[1]	25	51
Temporarily Impaired Total, Fair Value	[1]	2,126	4,641
Temporarily Impaired Total, Unrealized Losses	[1]	25	72
State and municipal securities
Temporarily Impaired Less than 12 months, Fair Value	[2]	0	0
Temporarily Impaired Less than 12 Months, Unrealized Losses	[2]	0	0
Temporarily Impaired 12 months or more, Fair Value	[2]	9	9
Temporarily Impaired 12 Months or more, Unrealized Losses	[2],[3]	0	0
Temporarily Impaired Total, Fair Value	[2]	9	9
Temporarily Impaired Total, Unrealized Losses	[2],[3]	0	0
Corporate debt securities
Temporarily Impaired Less than 12 months, Fair Value	[2]	0	0
Temporarily Impaired Less than 12 Months, Unrealized Losses	[2]	0	0
Temporarily Impaired 12 months or more, Fair Value	[2]	1	1
Temporarily Impaired 12 Months or more, Unrealized Losses	[2],[3]	0	0
Temporarily Impaired Total, Fair Value	[2]	1	1
Temporarily Impaired Total, Unrealized Losses	[2],[3]	0	0
Equity and other non-debt securities
Temporarily Impaired Less than 12 months, Fair Value	[2]	51	14
Temporarily Impaired Less than 12 Months, Unrealized Losses	[2]	1	0	[3]
Temporarily Impaired 12 months or more, Fair Value	[2]	0	0
Temporarily Impaired 12 Months or more, Unrealized Losses	[2]	0	0
Temporarily Impaired Total, Fair Value	[2]	51	14
Temporarily Impaired Total, Unrealized Losses	[2]	$ 1	$ 0	[3]
[1]	Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
[2]	Primarily auction-rate securities
[3]	Unrealized losses less than $0.5 million.

Investment Securities (Contract

Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Available-for-sale, Within one year, Amortized Cost		$ 10
Available-for-sale, After one year through five years, Amortized Cost		3,002
Available-for-sale, After five years through ten years, Amortized Cost		1,438
Available-for-sale, After ten years, Amortized Cost		5,797
Available-for-sale, Subtotal, Amortized Cost		10,247
Available-for-sale, Within one year, Fair Value		10
Available-for-sale, After one year through five years, Fair Value		3,058
Available-for-sale, After five years through ten years, Fair Value		1,490
Available-for-sale, After ten years, Fair Value		5,866
Available-for-sale, Subtotal, Fair Value		10,424
Investment securities available-for-sale, Amortized Cost	[1]	10,430	$ 10,491
Investment securities available-for-sale, Fair Value	[1]	10,607	10,519
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		1,907
Held-to-maturity Securities		1,907	1,981
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		1,927
Held-to-maturity Securities, Fair Value		1,927
Equity and other non-debt securities
Investment securities available-for-sale, Amortized Cost		183	199
Investment securities available-for-sale, Fair Value		$ 183	$ 201
[1]	Included auction-rate securities at amortized cost and fair value of $61 million and $60 million, respectively as of March 31, 2016 and $76 million and $77 million, respectively, as of December 31, 2015.

Credit Quality And Allowance 42

Credit Quality And Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Retail loans secured by residential real estate in process of foreclosure	$ 0		$ 1
Commitments to lend additional funds to TDR borrowers	$ 14		$ 6
Interest Rate Reductions
Days past due defined as subsequent default	90 days	90 days
Balance	$ 4	$ 3
Subsequent default during period	$ 0	$ 0
AB Note Restructures
Days past due defined as subsequent default	90 days	90 days
Balance	$ 27
Subsequent default during period	$ 0	$ 0

Credit Quality And Allowance 43

Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		$ 160	$ 146
Nonaccrual loans		681	367
Current loans		48,536	48,571
Total loans		49,377	49,084
30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		91	108
60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		56	21
90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		13	17
Business loans | Commercial borrower
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		135	104
Nonaccrual loans		627	313
Current loans		44,258	44,312
Total loans		45,020	44,729
Business loans | Commercial borrower | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		79	70
Business loans | Commercial borrower | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		52	17
Business loans | Commercial borrower | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		4	17
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		65	71
Nonaccrual loans		547	238
Current loans		30,950	31,350
Total loans		31,562	31,659
Business loans | Commercial borrower | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		44	46
Business loans | Commercial borrower | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		19	12
Business loans | Commercial borrower | Domestic loans | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		2	13
Business loans | Commercial borrower | International loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		22	2
Nonaccrual loans		27	8
Current loans		1,406	1,358
Total loans		1,455	1,368
Business loans | Commercial borrower | International loans | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		10	2
Business loans | Commercial borrower | International loans | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		12	0
Business loans | Commercial borrower | International loans | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		3	8
Nonaccrual loans		0	1
Current loans		2,287	1,992
Total loans		2,290	2,001
Business loans | Real estate construction | Commercial borrower | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	8
Business loans | Real estate construction | Commercial borrower | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		3	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	0	5
Nonaccrual loans	[1]	0	0
Current loans	[1]	1,947	1,676
Total loans	[1],[2]	1,947	1,681
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	0	5
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[3]	3	3
Nonaccrual loans	[3]	0	1
Current loans	[3]	340	316
Total loans	[3],[4]	343	320
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[3]	0	3
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[3]	3	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[3]	0	0
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		45	23
Nonaccrual loans		47	60
Current loans		8,890	8,894
Total loans		8,982	8,977
Business loans | Real estate | Commercial borrower | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		25	14
Business loans | Real estate | Commercial borrower | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		18	5
Business loans | Real estate | Commercial borrower | Domestic loans | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		2	4
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	31	8
Nonaccrual loans	[1]	8	16
Current loans	[1]	2,129	2,080
Total loans	[1],[2]	2,168	2,104
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	18	7
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	13	0
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[1]	0	1
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[3]	14	15
Nonaccrual loans	[3]	39	44
Current loans	[3]	6,761	6,814
Total loans	[3],[4]	6,814	6,873
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[3]	7	7
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[3]	5	5
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing	[3]	2	3
Business loans | Lease financing | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	0
Nonaccrual loans		6	6
Current loans		725	718
Total loans		731	724
Business loans | Lease financing | Commercial borrower | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	0
Business loans | Lease financing | Commercial borrower | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	0
Business loans | Lease financing | Commercial borrower | Domestic loans | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	0
Retail loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		25	42
Nonaccrual loans		54	54
Current loans		4,278	4,259
Total loans		4,357	4,355
Retail loans | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		12	38
Retail loans | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		4	4
Retail loans | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		9	0
Retail loans | Consumer borrower
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		9	15
Nonaccrual loans		28	27
Current loans		2,446	2,443
Total loans		2,483	2,485
Retail loans | Consumer borrower | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		6	12
Retail loans | Consumer borrower | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		3	3
Retail loans | Consumer borrower | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	0
Retail loans | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		16	27
Nonaccrual loans		26	27
Current loans		1,832	1,816
Total loans		1,874	1,870
Retail loans | Real estate | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		6	26
Retail loans | Real estate | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		1	1
Retail loans | Real estate | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		9	0
Retail loans | Home equity | Consumer borrower
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		7	8
Nonaccrual loans		27	27
Current loans		1,704	1,685
Total loans		1,738	1,720
Retail loans | Home equity | Consumer borrower | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		5	5
Retail loans | Home equity | Consumer borrower | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		2	3
Retail loans | Home equity | Consumer borrower | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		0	0
Retail loans | Other consumer | Consumer borrower
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		2	7
Nonaccrual loans		1	0
Current loans		742	758
Total loans		745	765
Retail loans | Other consumer | Consumer borrower | 30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		1	7
Retail loans | Other consumer | Consumer borrower | 60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		1	0
Retail loans | Other consumer | Consumer borrower | 90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		$ 0	$ 0
[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.

Credit Quality And Allowance 44

Credit Quality And Allowance For Credit Losses (Loans By Credit Quality Indicator) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans		$ 49,377	$ 49,084
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	45,449	45,891
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1,517	1,579
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	1,730	1,247
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	681	367
Business loans | Commercial borrower
Financing Receivable, Recorded Investment [Line Items]
Total loans		45,020	44,729
Business loans | Commercial borrower | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	41,169	41,621
Business loans | Commercial borrower | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1,511	1,573
Business loans | Commercial borrower | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	1,713	1,222
Business loans | Commercial borrower | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	627	313
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		31,562	31,659
Business loans | Commercial borrower | Domestic loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	28,295	29,117
Business loans | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1,227	1,293
Business loans | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	1,493	1,011
Business loans | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	547	238
Business loans | Commercial borrower | International loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,455	1,368
Business loans | Commercial borrower | International loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,334	1,245
Business loans | Commercial borrower | International loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	41	59
Business loans | Commercial borrower | International loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	53	56
Business loans | Commercial borrower | International loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	27	8
Business loans | Real estate construction | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		2,290	2,001
Business loans | Real estate construction | Commercial borrower | Domestic loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	2,281	1,999
Business loans | Real estate construction | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	8	1
Business loans | Real estate construction | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	1	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	0	1
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	[5],[6]	1,947	1,681
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[6]	1,947	1,681
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[6]	0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[6]	0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[6]	0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	[7],[8]	343	320
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[8]	334	318
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[8]	8	1
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[8]	1	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[8]	0	1
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		8,982	8,977
Business loans | Real estate | Commercial borrower | Domestic loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	8,555	8,567
Business loans | Real estate | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	221	203
Business loans | Real estate | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	159	147
Business loans | Real estate | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	47	60
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	[5],[6]	2,168	2,104
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[6]	2,104	2,031
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[6]	32	31
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[6]	24	26
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[6]	8	16
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	[7],[8]	6,814	6,873
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[8]	6,451	6,536
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[8]	189	172
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[8]	135	121
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[8]	39	44
Business loans | Lease financing | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		731	724
Business loans | Lease financing | Commercial borrower | Domestic loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	704	693
Business loans | Lease financing | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	14	17
Business loans | Lease financing | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	7	8
Business loans | Lease financing | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	6	6
Retail loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		4,357	4,355
Retail loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	4,280	4,270
Retail loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	6	6
Retail loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	17	25
Retail loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	54	54
Retail loans | Consumer borrower
Financing Receivable, Recorded Investment [Line Items]
Total loans		2,483	2,485
Retail loans | Consumer borrower | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	2,443	2,442
Retail loans | Consumer borrower | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	5	4
Retail loans | Consumer borrower | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	7	12
Retail loans | Consumer borrower | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	28	27
Retail loans | Real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,874	1,870
Retail loans | Real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,837	1,828
Retail loans | Real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1	2
Retail loans | Real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	10	13
Retail loans | Real estate | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	26	27
Retail loans | Home equity | Consumer borrower
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,738	1,720
Retail loans | Home equity | Consumer borrower | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,706	1,687
Retail loans | Home equity | Consumer borrower | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	2	1
Retail loans | Home equity | Consumer borrower | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	3	5
Retail loans | Home equity | Consumer borrower | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	27	27
Retail loans | Other consumer | Consumer borrower
Financing Receivable, Recorded Investment [Line Items]
Total loans		745	765
Retail loans | Other consumer | Consumer borrower | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	737	755
Retail loans | Other consumer | Consumer borrower | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	3	3
Retail loans | Other consumer | Consumer borrower | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	4	7
Retail loans | Other consumer | Consumer borrower | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	$ 1	$ 0
[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-58 in the Corporation's 2015 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.

Credit Quality And Allowance 45

Credit Quality And Allowance For Credit Losses (Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Nonaccrual loans		$ 681	$ 367
Reduced-rate loans	[1]	8	12
Total nonperforming loans		689	379
Foreclosed property	[2]	25	12
Total nonperforming assets		714	391
Residential Real Estate
Foreclosed property		8	9
Business loans
Reduced-rate loans		0	0
Retail loans
Nonaccrual loans		54	54
Reduced-rate loans		$ 8	$ 12
[1]	There were no reduced-rate business loans at both March 31, 2016 and December 31, 2015. Reduced-rate retail loans were $8 million and $12 million at March 31, 2016 and December 31, 2015, respectively.
[2]	Included $8 million and $9 million of foreclosed residential real estate properties at March 31, 2016 and December 31, 2015, respectively.

Credit Quality And Allowance 46

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
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		$ 148	$ 14
Total loans				$ 49,377	$ 49,084
Allowance for loan losses on PCI loans				$ 0	0
Financing Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		634	594
Loan charge-offs		(77)	(23)
Recoveries on loans previously charged-off		25	15
Net loan (charge-offs) recoveries		(52)	(8)
Provision for loan losses		141	16
Foreign currency translation adjustment		1	(1)
Balance at end of period		724	601
As a percentage of total loans				1.47%		1.22%
Allowance for loan losses individually evaluated for impairment				$ 88		$ 31
Allowance for loan losses collectively evaluated for impairment				636		570
Total allowance for loan losses		634	594	724	634	601
Loans individually evaluated for impairment				782		206
Loans collectively evaluated for impairment				48,595		48,864
Purchased credit impaired (PCI) loans	[1]			0		2
Total loans				$ 49,377		$ 49,072
Business loans | Financing Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		579	534
Loan charge-offs		(75)	(21)
Recoveries on loans previously charged-off		24	12
Net loan (charge-offs) recoveries		(51)	(9)
Provision for loan losses		145	17
Foreign currency translation adjustment		1	(1)
Balance at end of period		674	541
As a percentage of total loans				1.50%		1.21%
Allowance for loan losses individually evaluated for impairment				$ 88		$ 31
Allowance for loan losses collectively evaluated for impairment				586		510
Total allowance for loan losses		579	534	674	579	541
Loans individually evaluated for impairment				755		169
Loans collectively evaluated for impairment				44,265		44,622
Purchased credit impaired (PCI) loans	[1]			0		0
Total loans				45,020		$ 44,791
Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans				$ 4,357	4,355
Retail loans | Financing Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		55	60
Loan charge-offs		(2)	(2)
Recoveries on loans previously charged-off		1	3
Net loan (charge-offs) recoveries		(1)	1
Provision for loan losses		(4)	(1)
Foreign currency translation adjustment		0	0
Balance at end of period		50	60
As a percentage of total loans				1.14%		1.39%
Allowance for loan losses individually evaluated for impairment				$ 0		$ 0
Allowance for loan losses collectively evaluated for impairment				50		60
Total allowance for loan losses		$ 55	$ 60	50	$ 55	60
Loans individually evaluated for impairment				27		37
Loans collectively evaluated for impairment				4,330		4,242
Purchased credit impaired (PCI) loans	[1]			0		2
Total loans				$ 4,357		$ 4,281
[1]	No allowance for loan losses was required for PCI loans at March 31, 2016 and 2015.

Credit Quality And Allowance 47

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
		Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses		$ 148	$ 14
Lending-related commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		45	41
Charge-offs on lending related commitments	[1]	(6)	0
Provision for credit losses		7	(2)
Balance at end of period		$ 46	$ 39
[1]	Charge-offs result from the sale of unfunded lending-related commitments.

Credit Quality And Allowance 48

Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		$ 133	$ 122
Recorded investment in impaired loans with related allowance		649	302
Recorded investment total impaired loans		782	424
Unpaid principal balance		901	547
Related allowance for loan losses		88	53
Business loans | Commercial borrower
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		106	91
Recorded investment in impaired loans with related allowance		649	302
Recorded investment total impaired loans		755	393
Unpaid principal balance		874	508
Related allowance for loan losses		88	53
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		106	82
Recorded investment in impaired loans with related allowance		583	252
Recorded investment total impaired loans		689	334
Unpaid principal balance		778	398
Related allowance for loan losses		80	45
Business loans | Commercial borrower | International loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		0	0
Recorded investment in impaired loans with related allowance		27	10
Recorded investment total impaired loans		27	10
Unpaid principal balance		35	17
Related allowance for loan losses		2	2
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		0	9
Recorded investment in impaired loans with related allowance		39	40
Recorded investment total impaired loans		39	49
Unpaid principal balance		61	93
Related allowance for loan losses		6	6
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[1]	0	7
Recorded investment in impaired loans with related allowance	[1]	8	8
Recorded investment total impaired loans	[1]	8	15
Unpaid principal balance	[1]	15	38
Related allowance for loan losses	[1]	1	1
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[2]	0	2
Recorded investment in impaired loans with related allowance	[2]	31	32
Recorded investment total impaired loans	[2]	31	34
Unpaid principal balance	[2]	46	55
Related allowance for loan losses	[2]	5	5
Retail loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[3]	27	31
Recorded investment in impaired loans with related allowance	[3]	0	0
Recorded investment total impaired loans	[3]	27	31
Unpaid principal balance	[3]	27	39
Related allowance for loan losses	[3]	0	0
Retail loans | Consumer borrower
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		15	18
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		15	18
Unpaid principal balance		15	26
Related allowance for loan losses		0	0
Retail loans | Real estate
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		12	13
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		12	13
Unpaid principal balance		12	13
Related allowance for loan losses		0	0
Retail loans | Home equity | Consumer borrower
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		12	16
Related allowance for loan losses		0	0
Retail loans | Other consumer | Consumer borrower
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		3	6
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		3	6
Unpaid principal balance		3	10
Related allowance for loan losses		$ 0	$ 0
[1]	Primarily loans to real estate developers.
[2]	Primarily loans secured by owner-occupied real estate.
[3]	Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy which results in direct write-downs of restructured retail loans.

Credit Quality And Allowance 49

Credit Quality And Allowance For Credit Losses (Average Individually Evaluated Impaired Loans And Related Interest Recognized) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		$ 603	$ 212
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		4	1
Business loans | Commercial borrower
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		574	173
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		4	1
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		511	109
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		4	1
Business loans | Commercial borrower | International loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		19	1
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		44	63
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	[1]	11	19
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[1]	0	0
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	[2]	33	44
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[2]	0	0
Retail loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		29	39
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0
Retail loans | Consumer borrower
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		17	16
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0
Retail loans | Real estate
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		12	23
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0
Retail loans | Home equity | Consumer borrower
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		12	12
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0
Retail loans | Other consumer | Consumer borrower
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		5	4
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		$ 0	$ 0
[1]	Primarily loans to real estate developers.
[2]	Primarily loans secured by owner-occupied real estate.

Credit Quality And Allowance 50

Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings By Type Of Modification) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		$ 174
Business loans | Commercial borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		172
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		160
Business loans | Commercial borrower | International loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		11
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	1
Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		2
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[2]	$ 145	$ 3
Minimum period loan terms were extended		90 days	90 days
Principal Deferrals | Business loans | Commercial borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[2]	$ 145	$ 3
Principal Deferrals | Business loans | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[2]	144	0
Principal Deferrals | Business loans | Commercial borrower | International loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[2]	0	0
Principal Deferrals | Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1],[2]	1	3
Principal Deferrals | Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[2]	0	$ 0
Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		2
Interest Rate Reductions | Business loans | Commercial borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0
Interest Rate Reductions | Business loans | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0
Interest Rate Reductions | Business loans | Commercial borrower | International loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0
Interest Rate Reductions | Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	0
Interest Rate Reductions | Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		2
AB Note Restructures
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	27
AB Note Restructures | Business loans | Commercial borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	27
AB Note Restructures | Business loans | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	16
AB Note Restructures | Business loans | Commercial borrower | International loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	11
AB Note Restructures | Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1],[3]	0
AB Note Restructures | Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	$ 0
[1]	Primarily loans secured by owner-occupied real estate.
[2]	Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates.
[3]	Loan restructurings whereby the original loan is restructured into two notes: an "A" note, which generally reflects the portion of the modified loan which is expected to be collected; and a "B" note, which is either fully charged off or exchanged for an equity interest.

Credit Quality And Allowance 51

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
		Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Modifications [Line Items]
Balance		$ 294	$ 31
Subsequent default during period		7	16
Business loans | Commercial borrower
Financing Receivable, Modifications [Line Items]
Balance		293	29
Subsequent default during period		7	16
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Balance		281	20
Subsequent default during period		1	15
Business loans | Commercial borrower | International loans
Financing Receivable, Modifications [Line Items]
Balance		1	0
Subsequent default during period		0	0
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Balance		11	9
Subsequent default during period		6	1
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Modifications [Line Items]
Balance	[1]	8	0
Subsequent default during period	[1]	6	0
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Modifications [Line Items]
Balance	[2]	3	9
Subsequent default during period	[2]	0	1
Retail loans
Financing Receivable, Modifications [Line Items]
Balance		1	2
Subsequent default during period		0	0
Retail loans | Home equity | Consumer borrower
Financing Receivable, Modifications [Line Items]
Balance	[3]	1	1
Subsequent default during period		0	0
Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Balance		0	1	[3]
Subsequent default during period		$ 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.

Derivative And Credit-Related52

Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value of securities pledged as collateral for derivative assets	$ 93
Cash received as collateral for derivative assets	319
Fair value of securities pledged as collateral for derivative liabilities	29
Cash posted as collateral for derivative liabilities	6
Aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	5
Aggregate fair value of collateral already posted for derivative instruments with credit-risk-related contingent features	0
Additional collateral that would be required to be posted as collateral if the credit-risk-related contingent features were triggered	5
Net interest income generated by risk management fair value interest rate swaps	17	$ 18
Net gain on interest rate fair value hedge ineffectiveness	3	1
Gain (loss) on foreign currency derivatives used as economic hedges	0	0
Net gain on open foreign currency positions	0	$ 0
Allowance for credit losses on lending-related commitments	46		$ 45
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit	$ 35		33
Final year of expiration for outstanding letters of credit	2,022
Risk participation agreements covering standby and commercial letters of credit	$ 319		287
Standby and commercial letters of credit outstanding	4,000		4,000
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities	47		49
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities	36		37
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit	11		12
Notional amount of derivative credit risk participation agreements	523		559
Maximum estimated exposure to credit risk participation agreements assuming 100% default	$ 10		$ 5
Weighted average remaining maturity of credit risk participation agreements, in years	2 years 3 months 7 days

Derivative And Credit-Related53

Derivative And Credit-Related Financial Instruments (Schedule Of Derivative Instruments) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	$ 21,206	$ 20,764
Fair Value of Gross Derivative Assets		853	818
Fair Value of Gross Derivative Liabilities		608	610
Derivative assets, Netting adjustment - Offsetting derivative liabilities		(118)	(127)
Derivative liabilities, Netting adjustment - Offsetting derivative assets		(118)	(127)
Derivative Assets, Netting adjustment - Cash collateral received		(256)	(291)
Derivative liabilities, Netting adjustment - Cash collateral posted		(6)	(3)
Net derivative assets included in the consolidated balance sheets	[2]	479	400
Net derivative liabilities included in the consolidated balance sheets	[2]	484	480
Derivative asset, securities pledged as collateral		(90)	(137)
Derivative liability, securities pledged as collateral		(28)	(3)
Net derivative assets after deducting amounts not offset in the consolidated balance sheets		389	263
Net derivative liabilities after deducting amounts not offset in the consolidated balance sheets		456	477
Credit valuation adjustments for counterparty credit risk		10	5
Risk management purposes
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	3,310	3,118
Fair Value of Gross Derivative Assets		194	150
Fair Value of Gross Derivative Liabilities		5	0
Risk management purposes | Derivatives designated as hedging instruments | Fair value hedging | Interest rate swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,525	2,525
Fair Value of Gross Derivative Assets		193	147
Fair Value of Gross Derivative Liabilities		0	0
Risk management purposes | Derivatives used as economic hedges | Foreign exchange spot, forwards and swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	785	593
Fair Value of Gross Derivative Assets		1	3
Fair Value of Gross Derivative Liabilities		5	0
Customer-initiated and other activities
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	17,896	17,646
Fair Value of Gross Derivative Assets		659	668
Fair Value of Gross Derivative Liabilities		603	610
Customer-initiated and other activities | Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	12,832	12,228
Fair Value of Gross Derivative Assets		214	139
Fair Value of Gross Derivative Liabilities		169	92
Customer-initiated and other activities | Interest rate caps and floors written
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	273	253
Fair Value of Gross Derivative Assets		0	0
Fair Value of Gross Derivative Liabilities		0	0
Customer-initiated and other activities | Interest rate caps and floors purchased
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	273	253
Fair Value of Gross Derivative Assets		0	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]	12,286	11,722
Fair Value of Gross Derivative Assets		214	139
Fair Value of Gross Derivative Liabilities		169	92
Customer-initiated and other activities | Energy Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,620	3,127
Fair Value of Gross Derivative Assets		393	475
Fair Value of Gross Derivative Liabilities		391	472
Customer-initiated and other activities | Energy caps and floors written
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	417	536
Fair Value of Gross Derivative Assets		0	0
Fair Value of Gross Derivative Liabilities		57	85
Customer-initiated and other activities | Energy caps and floors purchased
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	417	536
Fair Value of Gross Derivative Assets		57	85
Fair Value of Gross Derivative Liabilities		0	0
Customer-initiated and other activities | Energy swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	1,786	2,055
Fair Value of Gross Derivative Assets		336	390
Fair Value of Gross Derivative Liabilities		334	387
Customer-initiated and other activities | Foreign exchange spot, forwards, options and swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,444	2,291
Fair Value of Gross Derivative Assets		52	54
Fair Value of Gross Derivative Liabilities		$ 43	$ 46
[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 $10 million and $5 million at March 31, 2016 and December 31, 2015, respectively.

Derivative And Credit-Related54

Derivative And Credit-Related Financial Instruments (Schedule Of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Notional Amount	[1]	$ 21,206		$ 20,764
Risk management purposes
Notional Amount	[1]	3,310		3,118
Medium- and long-term debt | Swaps - fair value - receive fixed/pay floating | Risk management purposes | Interest rate swaps
Notional Amount		$ 2,525		$ 2,525
Weighted Average Remaining Maturity		4 years 10 months 3 days	5 years 1 month
Weighted Average Receive Rate		3.89%		3.89%
Weighted Average Pay Rate	[2]	1.29%		1.11%
[1]	Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.
[2]	Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at March 31, 2016 and December 31, 2015.

Derivative And Credit-Related55

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
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	$ 12	$ 13
Interest rate contracts | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	2	2
Energy contracts | Other noninterest income
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	0	1
Foreign exchange contracts | Foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	$ 10	$ 10

Derivative And Credit-Related56

Derivative And Credit-Related Financial Instruments (Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Unused commitments to extend credit
Loss contingency, range of possible loss, maximum	$ 27,500	$ 28,529
Commercial and other | Unused commitments to extend credit
Loss contingency, range of possible loss, maximum	25,032	26,115
Bankcard, revolving check credit and home equity loan commitments | Unused commitments to extend credit
Loss contingency, range of possible loss, maximum	2,468	2,414
Standby letters of credit
Loss contingency, range of possible loss, maximum	3,949	3,985
Commercial letters of credit
Loss contingency, range of possible loss, maximum	$ 61	$ 41

Derivative And Credit-Related57

Derivative And Credit-Related Financial Instruments (Summary Of Internally Classified Watch List Letters Of Credit) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Total criticized standby and commercial letters of credit	$ 135	$ 110
As a percentage of total outstanding standby and commercial letters of credit	3.40%	2.70%

Variable Interest Entities (V58

Variable Interest Entities (VIEs) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Variable Interest Entity
Unfunded commitments to fund tax credit entities	$ 156
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	411
Other Tax Credit Entities
Variable Interest Entity
Exposure to loss as a result of involvement with VIEs	$ 9

Variable Interest Entities (V59

Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Variable Interest Entity
Other noninterest income	$ 17	$ 27
Provision for income taxes	25	61
Variable Interest Entity
Variable Interest Entity
Other noninterest income	0	1
Provision for income taxes, amortization of LIHTC investments	16	15
Provision for income taxes	(6)	(5)
Low income housing tax credits | Variable Interest Entity
Variable Interest Entity
Provision for income taxes, affordable housing tax credits and other tax benefits	(16)	(15)
Other tax benefits related to tax credit entities | Variable Interest Entity
Variable Interest Entity
Provision for income taxes, affordable housing tax credits and other tax benefits	$ (6)	$ (5)

Medium- And Long-Term Debt (Nar

Medium- And Long-Term Debt (Narrative) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2016	Apr. 06, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance cost			$ 8	$ 8
Subsidiaries
Debt Instrument [Line Items]
Blanket lien on real estate-related loans securing FHLB advances			15,000
Potential FHLB borrowing capacity			$ 5,600
Subsequent Event - Debt Issuance | Subsidiaries | Floating Rate Based on FHLB Auction Rate Due 2026
Debt Instrument [Line Items]
FHLB advances drawn in early April 2016		$ 1,600
Initial interest rate		0.399%
Maturity Date	Mar. 4, 2026
Number of notes issued		4

Medium- And Long-Term Debt (Sch

Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total medium- and long-term debt		$ 3,109	$ 3,058
Parent Company
Debt Instrument [Line Items]
Total medium- and long-term debt		626	608
Subsidiaries
Debt Instrument [Line Items]
Subordinated notes		1,782	1,763
Total medium- and long-term debt		2,483	2,450
3.80% subordinated notes due 2026 | Parent Company
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 272	$ 259
Stated interest rate		3.80%	3.80%
Maturity Date		Jul. 22, 2026	Jul. 22, 2026
2.125% notes due 2019 | Parent Company
Debt Instrument [Line Items]
Medium-term notes	[1]	$ 354	$ 349
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],[2]	$ 657	$ 659
Stated interest rate		5.75%	5.75%
Maturity Date		Nov. 21, 2016	Nov. 21, 2016
Par value swapped to variable rate		$ 250
Total par value outstanding		600
5.20% subordinated notes due 2017 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 527	$ 530
Stated interest rate		5.20%	5.20%
Maturity Date		Aug. 22, 2017	Aug. 22, 2017
4.00% subordinated notes due 2025 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 367	$ 351
Stated interest rate		4.00%
Maturity Date		Jul. 27, 2025
7.875% subordinated notes due 2026 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 231	$ 223
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]	$ 685	$ 671
Stated interest rate		2.50%
Maturity Date		Jun. 2, 2020
6.0% - 6.4% fixed-rate notes due 2020 | Subsidiaries
Debt Instrument [Line Items]
Other notes		$ 16	$ 16
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 fixed interest rates on these notes have been swapped to a variable rate and designated in a hedging relationship. Accordingly, carrying value has been adjusted to reflect the change in the fair value of the debt as a result of changes in the benchmark rate.
[2]	The fixed interest rate on $250 million of $600 million total par value of these notes have been swapped to a variable rate.

Accumulated Other Comprehensi62

Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Investment securities, Balance at beginning of period, net of tax	$ 9	$ 37
Investment securities, Net unrealized holding gains arising during the period	149	45
Investment securities, Less: Provision for income taxes	55	16
Investment securities, Net unrealized holding gains arising during the period, net of tax	94	29
Investment securities, Net realized losses included in net securities losses	0	(2)
Investment securities, Less: Benefit for income taxes	0	(1)
Investment securities, Reclassification adjustment for net securities losses included in net income, net of tax	0	(1)
Investment securities, Net losses realized as a yield adjustment in interest on investment securities	(1)	(2)
Investment securities, Less: Benefit for income taxes	0	(1)
Investment Securities, Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax	(1)	(1)
Investment securities, Change in net unrealized gains on investment securities, net of tax	95	31
Investment securities, Balance at end of period, net of tax	104	68
Benefit plans, Balance at beginning of period, net of tax	(438)	(449)
Benefit plans, Amortization of actuarial net loss	10	17
Benefit plans, Less: Provision for income taxes	4	6
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax	6	11
Benefit plans, Balance at end of period, net of tax	(432)	(438)
Total accumulated other comprehensive loss at end of period, net of tax	$ (328)	$ (370)	$ (429)

Net Income Per Common Share (Ba

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
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 60	$ 134
Income allocated to participating securities	1	2
Net income attributable to common shares	$ 59	$ 132
Basic average common shares	173	176
Basic net income per common share	$ 0.34	$ 0.75
Basic average common shares	173	176
Net effect of the assumed exercise of stock options	1	2
Net effect of the assumed exercise of warrants	2	4
Diluted average common shares	176	182
Diluted net income per common share	$ 0.34	$ 0.73

Net Income Per Common Share (Sc

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
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding options	6.9	6.8
Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Range of exercise prices	$ 37.26	$ 46.68
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Range of exercise prices	$ 59.86	$ 60.82

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Net periodic defined benefit cost	$ 3	$ 11
Qualified Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	9
Interest cost	23	22
Expected return on plan assets	(41)	(40)
Amortization of prior service cost (credit)	1	1
Amortization of net loss	8	14
Net periodic defined benefit cost	(1)	6
Non-Qualified Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	2	2
Amortization of prior service cost (credit)	(1)	(1)
Amortization of net loss	2	3
Net periodic defined benefit cost	4	5
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Net periodic defined benefit cost	$ 0	$ 0

Income Taxes And Tax-Related 66

Income Taxes And Tax-Related Items Income Taxes And Tax-Related Items (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Unrecognized tax benefits	$ 15	$ 22
Decrease in unrecognized tax benefits due to recognition of federal settlements	7
Reasonably possible decrease in unrecognized tax benefits in next 12 months	1
Tax-related interest and penalties payable	3	3
Net deferred tax assets	173	199
Decrease in net deferred tax assets	26
State net operating loss carryforwards	5	5
Valuation allowance for deferred tax assets	$ 3	$ 3
Minimum
Years state net operating loss carryforwards expire	Dec. 31, 2016
Maximum
Years state net operating loss carryforwards expire	Dec. 31, 2026

Contingent Liabilities (Narrati

Contingent Liabilities (Narrative) (Details) - USD ($)	Jan. 17, 2014	Mar. 31, 2016	Mar. 31, 2015
Loss Contingencies [Line Items]
Legal fees		$ 5,000,000	$ 5,000,000
Pending Litigation
Loss Contingencies [Line Items]
Minimum amount of reasonably possible losses		0
Estimated maximum amount of reasonably possible losses		$ 31,000,000
Butte Local Development v. Masters Group v. Comerica Bank
Loss Contingencies [Line Items]
Amount of damages awarded by the jury	$ 52,000,000

Business Segment Information (N

Business Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016segmentsmarkets
Segment Reporting [Abstract]
Number of Major Business Segments | segments	3
Number of Primary Market Segments | markets	3

Business Segment Information (B

Business Segment Information (Business Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Net interest income (expense) (FTE)		$ 448	$ 414
Provision for credit losses		148	14
Noninterest income		246	252
Noninterest expenses		460	456
Provision (benefit) for income taxes (FTE)		26	62
Net income (loss)		60	134
Net credit-related charge-offs (recoveries)		58	8
Assets, average		69,228	68,735
Loans, average		48,392	48,151
Deposits, average		$ 56,708	$ 56,990
Return on average assets	[1]	0.34%	0.78%
Efficiency ratio	[2]	66.07%	68.37%
Business Bank
Net interest income (expense) (FTE)		$ 365	$ 370
Provision for credit losses		151	25
Noninterest income		135	140
Noninterest expenses		207	198
Provision (benefit) for income taxes (FTE)		47	98
Net income (loss)		95	189
Net credit-related charge-offs (recoveries)		57	9
Assets, average		38,635	38,654
Loans, average		37,561	37,623
Deposits, average		$ 29,108	$ 30,143
Return on average assets	[1]	0.98%	1.95%
Efficiency ratio	[2]	41.41%	38.88%
Retail Bank
Net interest income (expense) (FTE)		$ 157	$ 151
Provision for credit losses		3	(8)
Noninterest income		43	41
Noninterest expenses		179	174
Provision (benefit) for income taxes (FTE)		6	9
Net income (loss)		12	17
Net credit-related charge-offs (recoveries)		2	0
Assets, average		6,544	6,368
Loans, average		5,867	5,694
Deposits, average		$ 23,110	$ 22,404
Return on average assets	[1]	0.20%	0.30%
Efficiency ratio	[2]	88.47%	90.57%
Wealth Management
Net interest income (expense) (FTE)		$ 43	$ 43
Provision for credit losses		(5)	(1)
Noninterest income		59	58
Noninterest expenses		73	77
Provision (benefit) for income taxes (FTE)		12	9
Net income (loss)		22	16
Net credit-related charge-offs (recoveries)		(1)	(1)
Assets, average		5,162	5,029
Loans, average		4,964	4,834
Deposits, average		$ 4,171	$ 3,996
Return on average assets	[1]	1.70%	1.29%
Efficiency ratio	[2]	71.32%	74.58%
Finance
Net interest income (expense) (FTE)		$ (121)	$ (152)
Provision for credit losses		0	0
Noninterest income		14	12
Noninterest expenses		2	2
Provision (benefit) for income taxes (FTE)		(41)	(53)
Net income (loss)		(68)	(89)
Net credit-related charge-offs (recoveries)		0	0
Assets, average		14,186	12,137
Loans, average		0	0
Deposits, average		103	170
Other
Net interest income (expense) (FTE)		4	2
Provision for credit losses		(1)	(2)
Noninterest income		(5)	1
Noninterest expenses		(1)	5
Provision (benefit) for income taxes (FTE)		2	(1)
Net income (loss)		(1)	1
Net credit-related charge-offs (recoveries)		0	0
Assets, average		4,701	6,547
Loans, average		0	0
Deposits, average		$ 216	$ 277
[1]	Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.
[2]	Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

Business Segment Information (M

Business Segment Information (Market Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Net interest income (expense) (FTE)		$ 448	$ 414
Provision for credit losses		148	14
Noninterest income		246	252
Noninterest expenses		460	456
Provision (benefit) for income taxes (FTE)		26	62
Net income (loss)		60	134
Net credit-related charge-offs (recoveries)		58	8
Assets, average		69,228	68,735
Loans, average		48,392	48,151
Deposits, average		$ 56,708	$ 56,990
Return on average assets	[1]	0.34%	0.78%
Efficiency ratio	[2]	66.07%	68.37%
Michigan
Net interest income (expense) (FTE)		$ 176	$ 177
Provision for credit losses		(6)	(8)
Noninterest income		76	80
Noninterest expenses		150	154
Provision (benefit) for income taxes (FTE)		36	38
Net income (loss)		72	73
Net credit-related charge-offs (recoveries)		5	3
Assets, average		13,402	13,736
Loans, average		12,774	13,223
Deposits, average		$ 21,696	$ 21,710
Return on average assets	[1]	1.27%	1.30%
Efficiency ratio	[2]	59.31%	60.10%
California
Net interest income (expense) (FTE)		$ 179	$ 176
Provision for credit losses		(6)	(3)
Noninterest income		38	36
Noninterest expenses		104	97
Provision (benefit) for income taxes (FTE)		45	44
Net income (loss)		74	74
Net credit-related charge-offs (recoveries)		8	1
Assets, average		17,541	16,461
Loans, average		17,283	16,193
Deposits, average		$ 16,654	$ 16,837
Return on average assets	[1]	1.68%	1.63%
Efficiency ratio	[2]	47.87%	46.11%
Texas
Net interest income (expense) (FTE)		$ 123	$ 131
Provision for credit losses		169	21
Noninterest income		30	35
Noninterest expenses		100	95
Provision (benefit) for income taxes (FTE)		(40)	18
Net income (loss)		(76)	32
Net credit-related charge-offs (recoveries)		47	3
Assets, average		11,295	12,192
Loans, average		10,763	11,535
Deposits, average		$ 10,374	$ 11,010
Return on average assets	[1]	(2.52%)	1.01%
Efficiency ratio	[2]	65.09%	57.30%
Other Markets
Net interest income (expense) (FTE)		$ 87	$ 80
Provision for credit losses		(8)	6
Noninterest income		93	88
Noninterest expenses		105	103
Provision (benefit) for income taxes (FTE)		24	16
Net income (loss)		59	43
Net credit-related charge-offs (recoveries)		(2)	1
Assets, average		8,103	7,662
Loans, average		7,572	7,200
Deposits, average		$ 7,665	$ 6,986
Return on average assets	[1]	2.87%	2.26%
Efficiency ratio	[2]	58.09%	60.42%
Finance & Other
Net interest income (expense) (FTE)		$ (117)	$ (150)
Provision for credit losses		(1)	(2)
Noninterest income		9	13
Noninterest expenses		1	7
Provision (benefit) for income taxes (FTE)		(39)	(54)
Net income (loss)		(69)	(88)
Net credit-related charge-offs (recoveries)		0	0
Assets, average		18,887	18,684
Loans, average		0	0
Deposits, average		$ 319	$ 447
[1]	Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.
[2]	Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details)	Mar. 31, 2016
2.50% Senior Notes Due 2020 | Subsidiaries
Subsequent Event [Line Items]
Stated interest rate	2.50%