Comerica (CMA) 10-Q 29 Oct 15 2015 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 26, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
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	2,015
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		176,734,815
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks		$ 1,101	$ 1,026
Interest-bearing deposits with banks		6,099	5,045
Other short-term investments		107	99
Investment securities available-for-sale	[1]	8,749	8,116
Investment securities held-to-maturity		1,863	1,935
Commercial loans		31,777	31,520
Real estate construction loans		1,874	1,955
Commercial mortgage loans		8,787	8,604
Lease financing		751	805
International loans		1,382	1,496
Residential mortgage loans		1,880	1,831
Consumer loans		2,491	2,382
Total loans		48,942	48,593
Less allowance for loan losses		(622)	(594)
Net loans		48,320	47,999
Premises and equipment		541	532
Accrued income and other assets		4,232	4,434
Total assets		71,012	69,186
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing deposits		28,697	27,224
Money market and interest-bearing checking deposits		23,948	23,954
Savings deposits		1,853	1,752
Customer certificates of deposit		4,126	4,421
Foreign office time deposits		144	135
Total interest-bearing deposits		30,071	30,262
Total deposits		58,768	57,486
Short-term borrowings		109	116
Accrued expenses and other liabilities		1,413	1,507
Medium- and long-term debt		3,100	2,675
Total liabilities		63,390	61,784
Common stock - $5 par value: Authorized - 325,000,000 shares; Issued - 228,164,824 shares		1,141	1,141
Capital surplus		2,165	2,188
Accumulated other comprehensive loss		(345)	(412)
Retained earnings		7,007	6,744
Less cost of common stock in treasury - 51,010,418 shares at 9/30/15 and 49,146,225 shares at 12/31/14		(2,346)	(2,259)
Total shareholders' equity		7,622	7,402
Total liabilities and shareholders' equity		$ 71,012	$ 69,186
[1]	Included auction-rate securities at amortized cost and fair value of $80 million and $79 million, respectively as of September 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value	$ 5	$ 5
Common stock, authorized shares	325,000,000	325,000,000
Common stock, issued shares	228,164,824	228,164,824
Shares in treasury	51,010,418	49,146,225

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
INTEREST INCOME
Interest and fees on loans	$ 390	$ 381	$ 1,156	$ 1,142
Interest on investment securities	54	52	160	160
Interest on short-term investments	4	3	11	10
Total interest income	448	436	1,327	1,312
INTEREST EXPENSE
Interest on deposits	11	11	33	33
Interest on medium- and long-term debt	15	11	38	39
Total interest expense	26	22	71	72
Net interest income	422	414	1,256	1,240
Provision for credit losses	26	5	87	25
Net interest income after provision for credit losses	396	409	1,169	1,215
NONINTEREST INCOME
Service charges on deposit accounts	56	54	167	162
Fiduciary income	47	44	142	133
Commercial lending fees	22	26	69	69
Card fees	75	23	214	68
Letter of credit fees	13	14	39	43
Bank-owned life insurance	10	11	29	31
Foreign exchange income	10	9	29	30
Brokerage fees	5	4	13	13
Net securities losses	0	(1)	(2)	0
Other noninterest income	26	31	80	94
Total noninterest income	264	215	780	643
NONINTEREST EXPENSES
Salaries and benefits expense	243	248	747	735
Net occupancy expense	41	46	118	125
Equipment expense	14	14	40	43
Outside processing fee expense	86	31	249	89
Software expense	26	25	73	72
Litigation-related expense	(3)	(2)	(32)	4
FDIC insurance expense	9	9	27	25
Advertising expense	6	5	17	16
Gain on debt redemption	0	(32)	0	(32)
Other noninterest expenses	39	53	117	130
Total noninterest expenses	461	397	1,356	1,207
Income before income taxes	199	227	593	651
Provision for income taxes	63	73	188	207
Net Income	136	154	405	444
Less income allocated to participating securities	2	2	5	6
Net income attributable to common shares	$ 134	$ 152	$ 400	$ 438
Basic earnings per common share	$ 0.76	$ 0.85	$ 2.27	$ 2.44
Diluted earnings per common share	$ 0.74	$ 0.82	$ 2.20	$ 2.35
Comprehensive income	$ 187	$ 141	$ 472	$ 518
Cash dividends declared on common stock	$ 37	$ 36	$ 110	$ 107
Cash dividends declared per common share	$ 0.21	$ 0.2	$ 0.62	$ 0.59

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, 2013	$ 7,150	$ 1,141	$ 2,179	$ (391)	$ 6,318	$ (2,097)
BALANCE (in shares) at Dec. 31, 2013		182.3
Net income	444				444
Other comprehensive income, net of tax	74			74
Cash dividends declared on common stock	(107)				(107)
Purchase of common stock	(200)					(200)
Purchase of common stock (in shares)		(4.1)
Net issuance of common stock under employee stock plans	41		(26)		(24)	91
Net issuance of common stock under employee stock plans (in shares)		2
Share-based compensation	31		31
Other	0		(1)			1
Other (in shares)		0
BALANCE at Sep. 30, 2014	7,433	$ 1,141	2,183	(317)	6,631	(2,205)
BALANCE (in shares) at Sep. 30, 2014		180.2
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	405				405
Other comprehensive income, net of tax	67			67
Cash dividends declared on common stock	(110)				(110)
Purchase of common stock	(175)					(175)
Purchase of common stock (in shares)		(3.8)
Purchase and retirement of warrants	(10)		(10)
Net issuance of common stock under employee stock plans	14		(21)		(10)	45
Net issuance of common stock under employee stock plans (in shares)		1
Net issuance of common stock for warrants	0		(21)		(22)	43
Net issuance of common stock for warrants (in shares)		1
Share-based compensation	29		29
BALANCE at Sep. 30, 2015	$ 7,622	$ 1,141	$ 2,165	$ (345)	$ 7,007	$ (2,346)
BALANCE (in shares) at Sep. 30, 2015		177.2

Consolidated Statements Of Cha6

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$ 0.21	$ 0.2	$ 0.62	$ 0.59

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES
Net income	$ 405	$ 444
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	87	25
Provision (benefit) for deferred income taxes	(52)	7
Depreciation and amortization	90	92
Net periodic defined benefit cost	34	29
Share-based compensation expense	29	31
Net amortization of securities	11	9
Accretion of loan purchase discount	(6)	(25)
Net securities losses	2	0
Net gains on sales of foreclosed property	(2)	(3)
Gain on debt redemption	0	(32)
Excess tax benefits from share-based compensation arrangements	(3)	(6)
Net change in trading securities	0	1
Net change in accrued income receivable	(9)	(2)
Net change in accrued expenses payable	(70)	(44)
Other, net	147	39
Net cash provided by operating activities	663	565
INVESTING ACTIVITIES
Maturities and redemptions of investment securities available-for-sale	1,282	1,328
Sales of investment securities available-for-sale	51	0
Purchases of investment securities available-for-sale	(1,933)	(1,413)
Maturities and redemptions of investment securities held-to-maturity	244	0
Purchases of investment securities held-to-maturity	(166)	0
Net change in loans	(436)	(2,254)
Proceeds from sales of foreclosed property	8	13
Net increase in premises and equipment	(78)	(38)
Sales of Federal Home Loan Bank stock	0	41
Other, net	5	(4)
Net cash used in investing activities	(1,023)	(2,327)
FINANCING ACTIVITIES
Net change in deposits	1,361	4,205
Net change in short-term borrowings	(7)	(51)
Maturities and redemptions of medium- and long-term debt	(606)	(1,406)
Issuances of medium- and long-term debt	1,016	596
Repurchases of common stock	(175)	(200)
Cash dividends paid on common stock	(109)	(101)
Issuances of common stock under employee stock plans	21	45
Purchase and retirement of warrants	(10)	0
Excess tax benefits from share-based compensation arrangements	3	6
Other, net	(5)	4
Net cash provided by financing activities	1,489	3,098
Net increase in cash and cash equivalents	1,129	1,336
Cash and cash equivalents at beginning of period	6,071	6,451
Cash and cash equivalents at end of period	7,200	7,787
Interest paid	64	74
Income tax paid	46	154
Noncash investing and financing activities:
Loans transferred to other real estate	9	13
Loans transferred from portfolio to held-for-sale	19	0
Lease residual transferred to other assets	$ 16	$ 0

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation and Accounting Policies	BASIS OF PRESENTATION AND ACCOUNTING POLICIES Organization The accompanying unaudited consolidated financial statements were prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation were included. The results of operations for the nine months ended September 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 . Certain items in prior periods were reclassified to conform to the current presentation. For further information, refer to the consolidated financial statements and footnotes thereto included in the Annual Report of Comerica Incorporated and Subsidiaries (the Corporation) on Form 10-K for the year ended December 31, 2014 . Revenue Recognition In the first quarter 2015, the Corporation entered into a new contract for an existing debit card program. Guidance provided in Accounting Standards Code 605-45, " Principal Agent Considerations," indicates whether revenue should be reported gross or net for this type of arrangement. Management assessed various principal versus agent indicators provided in the guidance and concluded that the Corporation bears the risks and rewards of providing the services for the card program based on the new contract terms and, therefore, gross presentation of revenues and expenses is appropriate. This change in presentation resulted in increases of $48 million and $136 million to both "card fees" in noninterest income and "outside processing fee expense" in noninterest expenses for the three- and nine-month periods ended September 30, 2015 , respectively. Recently Adopted Accounting Pronouncements Effective January 1, 2015, the Corporation prospectively adopted Accounting Standards Update (ASU) No. 2014-04, “Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure,” (ASU 2014-04), which clarifies when an in-substance foreclosure or repossession of residential real estate property occurs, requiring a creditor to reclassify the loan to other real estate. According to ASU 2014-04, a consumer mortgage loan should be reclassified to other real estate either upon the creditor obtaining legal title to the real estate collateral or when the borrower voluntarily conveys all interest in the real estate property to the creditor through a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also clarifies that a creditor that has obtained legal title to a foreclosed property should not delay reclassification when a borrower has a legal right of redemption for a period of time. The Corporation's existing accounting treatment is consistent with the new guidance, and therefore the adoption of ASU 2014-04 had no impact to the Corporation's financial condition and results of operations. Disclosures required by ASU 2014-04 are provided in Note 4. Also effective January 1, 2015, the Corporation prospectively adopted ASU No. 2014-12, “Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” (ASU 2014-12). The new guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The Corporation's current accounting treatment of performance conditions for employees who are or become retirement eligible prior to the achievement of the performance target is consistent with ASU 2014-12, and as such the adoption of ASU 2014-12 had no impact to the Corporation’s financial condition and results of operations. In the second quarter 2015, the Corporation early adopted ASU 2015-03, "Interest - Imputation of Interest (Subtopic 835-30)," which amends the presentation of debt issuance costs in the balance sheet as a direct deduction from the carrying amount of the related debt liability rather than as a deferred charge. The new guidance was retrospectively applied, which resulted in a decrease of $4 million to both "accrued income and other assets" and "medium- and long-term debt" on the consolidated balance sheets as of December 31, 2014 . Unamortized debt issuance costs deducted from the carrying amount of medium- and long-term debt totaled $9 million at September 30, 2015 . Pending Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous GAAP comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. The guidance under ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2017 and must be retrospectively applied. Entities will have the option of presenting prior periods as impacted by the new guidance or presenting the cumulative effect of initial application along with supplementary disclosures. Early adoption is permitted, but not before annual and interim periods beginning after December 15, 2016. The Corporation is currently evaluating the impact of adopting ASU 2014-09. In February 2015, the FASB issued ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis," (ASU 2015-02), which makes targeted amendments to the considerations applied by reporting entities when determining if a legal entity should be consolidated, including placing more emphasis on risk of loss when determining a controlling financial interest. Low-income housing tax credit investments that meet the criteria for the proportional amortization method are not impacted by these amendments. ASU 2015-02 is effective for annual and interim periods beginning after December 15, 2015, and must be retrospectively applied. Early adoption is permitted. The Corporation does not expect the adoption of ASU 2015-02 to have a material effect on its financial condition and results of operations. In April 2015, the FASB issued ASU 2015-05, "Goodwill and Other - Internal-Use Software (Subtopic 350-40)," (ASU 2015-05), which defines specific criteria entities must apply to determine if a cloud computing arrangement includes an in-substance software license. The result of the assessment will direct the entity to apply either software licensing or service contract guidance to record the related costs. ASU 2015-05 is effective for annual and interim periods beginning after December 15, 2015, and can be prospectively or retrospectively applied. Early adoption is permitted. The Corporation does not expect the adoption to have a material effect on its financial condition and results of operations. In May 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent),” (ASU 2015-07) which amends disclosure requirements for entities that utilize net asset value per share (or its equivalent) to measure fair value as a practical expedient. The update eliminates the requirement to classify these investments within the fair value hierarchy and instead requires disclosure of sufficient information about these investments to permit reconciliation of the fair value of investments categorized within the fair value hierarchy to the investments presented in the consolidated balance sheet. ASU 2015-07 is effective for annual and interim periods beginning after December 15, 2015 and must be applied retrospectively. Early adoption is permitted. The adoption of ASU 2015-07 will have no impact on the Corporation's financial condition or results of operations.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The Corporation utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The determination of fair values of financial instruments often requires the use of estimates. In cases where quoted market values in an active market are not available, the Corporation uses present value techniques and other valuation methods to estimate the fair values of its financial instruments. These valuation methods require considerable judgment and the resulting estimates of fair value can be significantly affected by the assumptions made and methods used. Trading securities, investment securities available-for-sale, derivatives and deferred compensation plan liabilities are recorded at fair value on a recurring basis. Additionally, from time to time, the Corporation may be required to record other assets and liabilities at fair value on a nonrecurring basis, such as impaired loans, other real estate (primarily foreclosed property), nonmarketable equity securities and certain other assets and liabilities. These nonrecurring fair value adjustments typically involve write-downs of individual assets or application of lower of cost or fair value accounting. Refer to Note 1 to the consolidated financial statements in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2014 for further information about the fair value hierarchy, descriptions of the valuation methodologies and key inputs used to measure financial assets and liabilities recorded at fair value, as well as a description of the methods and significant assumptions used to estimate fair value disclosures for financial instruments not recorded at fair value in their entirety on a recurring basis. When credit valuation adjustments are significant to the overall fair value of a derivative, the Corporation classifies the over-the-counter derivative valuation in Level 3 of the fair value hierarchy; otherwise, over-the-counter derivative valuations are classified in Level 2. ASSETS AND LIABLILITIES RECORDED AT FAIR VALUE ON A RECURRING BASIS The following tables present the recorded amount of assets and liabilities measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 . (in millions) Total Level 1 Level 2 Level 3 September 30, 2015 Trading securities: Deferred compensation plan assets $ 89 $ 89 $ — $ — Equity and other non-debt securities 3 3 — — State and municipal securities 1 — 1 — Total trading securities 93 92 1 — Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities 930 930 — — Residential mortgage-backed securities (a) 7,559 — 7,559 — State and municipal securities 9 — — 9 (b) Corporate debt securities 45 — 44 1 (b) Equity and other non-debt securities 206 137 — 69 (b) Total investment securities available-for-sale 8,749 1,067 7,603 79 Derivative assets: Interest rate contracts 375 — 364 11 Energy derivative contracts 459 — 459 — Foreign exchange contracts 51 — 51 — Warrants 3 — — 3 Total derivative assets 888 — 874 14 Total assets at fair value $ 9,730 $ 1,159 $ 8,478 $ 93 Derivative liabilities: Interest rate contracts $ 140 $ — $ 140 $ — Energy derivative contracts 456 — 456 — Foreign exchange contracts 44 — 44 — Other 1 — — 1 Total derivative liabilities 641 — 640 1 Deferred compensation plan liabilities 89 89 — — Total liabilities at fair value $ 730 $ 89 $ 640 $ 1 (a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (b) Auction-rate securities. (in millions) Total Level 1 Level 2 Level 3 December 31, 2014 Trading securities: Deferred compensation plan assets $ 94 $ 94 $ — $ — Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities 526 526 — — Residential mortgage-backed securities (a) 7,274 — 7,274 — State and municipal securities 23 — — 23 (b) Corporate debt securities 51 — 50 1 (b) Equity and other non-debt securities 242 130 — 112 (b) Total investment securities available-for-sale 8,116 656 7,324 136 Derivative assets: Interest rate contracts 328 — 328 — Energy derivative contracts 527 — 527 — Foreign exchange contracts 39 — 39 — Warrants 4 — — 4 Total derivative assets 898 — 894 4 Total assets at fair value $ 9,108 $ 750 $ 8,218 $ 140 Derivative liabilities: Interest rate contracts $ 102 $ — $ 102 $ — Energy derivative contracts 525 — 525 — Foreign exchange contracts 34 — 34 — Other 1 — — 1 Total derivative liabilities 662 — 661 1 Deferred compensation plan liabilities 94 94 — — Total liabilities at fair value $ 756 $ 94 $ 661 $ 1 (a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (b) Auction-rate securities. There were no transfers of assets or liabilities recorded at fair value on a recurring basis into or out of Level 1, Level 2 and Level 3 fair value measurements during each of the three- and nine-month periods ended September 30, 2015 and 2014 . The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three- and nine-month periods ended September 30, 2015 and 2014 . Net Realized/Unrealized Gains (Losses) (Pretax) Balance at Beginning of Period Recorded in Earnings Recorded in Other Comprehensive Income Balance at End of Period (in millions) Realized Unrealized Sales Three Months Ended September 30, 2015 Investment securities available-for-sale: State and municipal securities (a) $ 23 $ — $ — $ — $ (14 ) $ 9 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 71 — — (1 ) (b) (1 ) 69 Total investment securities available-for-sale 95 — — (1 ) (b) (15 ) 79 Derivative assets: Interest rate contracts 2 — 9 (d) — — 11 Warrants 3 5 (d) — — (5 ) 3 Derivative liabilities: Other 1 — — — — 1 Three Months Ended September 30, 2014 Investment securities available-for-sale: State and municipal securities (a) $ 23 $ — $ — $ — $ — $ 23 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 118 1 (c) — 1 (b) (7 ) 113 Total investment securities available-for-sale 142 1 (c) — 1 (b) (7 ) 137 Derivative assets: Warrants 4 2 (d) — — (2 ) 4 Derivative liabilities: Other 2 — (1 ) (c) — — 3 Nine Months Ended September 30, 2015 Investment securities available-for-sale: State and municipal securities (a) $ 23 $ — $ — $ — $ (14 ) $ 9 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 112 (2 ) (c) — — (41 ) 69 Total investment securities available-for-sale 136 (2 ) (c) — — (55 ) 79 Derivative assets: Interest rate contracts — — 11 (d) — — 11 Warrants 4 6 (d) (1 ) (d) — (6 ) 3 Derivative liabilities: Other 1 — — — — 1 Nine Months Ended September 30, 2014 Investment securities available-for-sale: State and municipal securities (a) $ 22 $ — $ — $ 1 (b) $ — $ 23 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 136 2 (c) — 7 (b) (32 ) 113 Total investment securities available-for-sale 159 2 (c) — 8 (b) (32 ) 137 Derivative assets: Warrants 3 6 (d) 1 (d) — (6 ) 4 Derivative liabilities: Other 2 — (1 ) (c) — — 3 (a) Auction-rate securities. (b) Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income. (c) Realized and unrealized gains and losses due to changes in fair value recorded in "net securities gains" on the consolidated statements of comprehensive income. (d) Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income. ASSETS AND LIABILITIES RECORDED AT FAIR VALUE ON A NONRECURRING BASIS The Corporation may be required, from time to time, to record certain assets and liabilities at fair value on a nonrecurring basis. These include assets that are recorded at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. The following table presents assets recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 . No liabilities were recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 . (in millions) Total Level 2 Level 3 September 30, 2015 Loans held-for-sale: Commercial $ 12 $ 12 $ — Loans: Commercial 124 — 124 Commercial mortgage 12 — 12 International 8 — 8 Total loans 144 — 144 Nonmarketable equity securities 1 — 1 Other real estate 3 — 3 Total assets at fair value $ 160 $ 12 $ 148 December 31, 2014 Loans: Commercial 38 — $ 38 Commercial mortgage 26 — 26 Total loans 64 — 64 Nonmarketable equity securities 2 — 2 Other real estate 2 — 2 Total assets at fair value $ 68 $ — $ 68 Level 3 assets recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 included loans for which a specific allowance was established based on the fair value of collateral and other real estate for which fair value of the properties was less than the cost basis. For both asset classes, the unobservable inputs were the additional adjustments applied by management to the appraised values to reflect such factors as non-current appraisals and revisions to estimated time to sell. These adjustments are determined based on qualitative judgments made by management on a case-by-case basis and are not quantifiable inputs, although they are used in the determination of fair value. The following table presents quantitative information related to the significant unobservable inputs utilized in the Corporation's Level 3 recurring fair value measurement as of September 30, 2015 and December 31, 2014 . The Corporation's Level 3 recurring fair value measurements include auction-rate securities where fair value is determined using an income approach based on a discounted cash flow model. The inputs in the table below reflect management's expectation of continued illiquidity in the secondary auction-rate securities market due to a lack of market activity for the issuers remaining in the portfolio, a lack of market incentives for issuer redemptions, and the expectation for a continuing low interest rate environment. The September 30, 2015 workout periods reflect management's view that short-term interest rates could begin to rise in 2015. Discounted Cash Flow Model Unobservable Input Fair Value (in millions) Discount Rate Workout Period (in years) September 30, 2015 State and municipal securities (a) $ 9 3% - 10% 1 - 3 Equity and other non-debt securities (a) 69 4% - 9% 1 - 2 December 31, 2014 State and municipal securities (a) $ 23 3% - 9% 1 - 3 Equity and other non-debt securities (a) 112 4% - 8% 1 - 2 (a) Auction-rate securities. ESTIMATED FAIR VALUES OF FINANCIAL INSTRUMENTS NOT RECORDED AT FAIR VALUE ON A RECURRING BASIS The Corporation typically holds the majority of its financial instruments until maturity and thus does not expect to realize many of the estimated fair value amounts disclosed. The disclosures also do not include estimated fair value amounts for items that are not defined as financial instruments, but which have significant value. These include such items as core deposit intangibles, the future earnings potential of significant customer relationships and the value of trust operations and other fee generating businesses. The Corporation believes the imprecision of an estimate could be significant. The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis on the Corporation’s consolidated balance sheets are as follows: Carrying Amount Estimated Fair Value (in millions) Total Level 1 Level 2 Level 3 September 30, 2015 Assets Cash and due from banks $ 1,101 $ 1,101 $ 1,101 $ — $ — Interest-bearing deposits with banks 6,099 6,099 6,099 — — Investment securities held-to-maturity 1,863 1,872 — 1,872 — Loans held-for-sale (a) 15 15 — 15 — Total loans, net of allowance for loan losses (b) 48,320 48,244 — — 48,244 Customers’ liability on acceptances outstanding 5 5 5 — — Nonmarketable equity securities (c) 10 19 — — 19 Restricted equity investments 92 92 92 — — Liabilities Demand deposits (noninterest-bearing) 28,697 28,697 — 28,697 — Interest-bearing deposits 25,945 25,945 — 25,945 — Customer certificates of deposit 4,126 4,119 — 4,119 — Total deposits 58,768 58,761 — 58,761 — Short-term borrowings 109 109 109 — — Acceptances outstanding 5 5 5 — — Medium- and long-term debt 3,100 3,047 — 3,047 — Credit-related financial instruments (89 ) (89 ) — — (89 ) December 31, 2014 Assets Cash and due from banks $ 1,026 $ 1,026 $ 1,026 $ — $ — Interest-bearing deposits with banks 5,045 5,045 5,045 — — Investment securities held-to-maturity 1,935 1,933 — 1,933 — Loans held-for-sale (a) 5 5 — 5 — Total loans, net of allowance for loan losses (b) 47,999 47,932 — — 47,932 Customers’ liability on acceptances outstanding 10 10 10 — — Nonmarketable equity securities (c) 11 18 — — 18 Restricted equity investments 92 92 92 — — Liabilities Demand deposits (noninterest-bearing) 27,224 27,224 — 27,224 — Interest-bearing deposits 25,841 25,841 — 25,841 — Customer certificates of deposit 4,421 4,411 — 4,411 — Total deposits 57,486 57,476 — 57,476 — Short-term borrowings 116 116 116 — — Acceptances outstanding 10 10 10 — — Medium- and long-term debt 2,675 2,681 — 2,681 — Credit-related financial instruments (85 ) (85 ) — — (85 ) (a) Included $12 million and no impaired loans held-for-sale recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 , respectively. (b) Included $144 million and $64 million of impaired loans recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 , respectively. (c) Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 , respectively.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES A summary of the Corporation’s investment securities follows: (in millions) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value September 30, 2015 Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities $ 917 $ 13 $ — $ 930 Residential mortgage-backed securities (a) 7,445 133 19 7,559 State and municipal securities 9 — — 9 Corporate debt securities 45 — — 45 Equity and other non-debt securities 206 1 1 206 Total investment securities available-for-sale (b) $ 8,622 $ 147 $ 20 $ 8,749 Investment securities held-to-maturity (c): Residential mortgage-backed securities (a) $ 1,863 $ 10 $ 1 $ 1,872 December 31, 2014 Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities $ 526 $ — $ — $ 526 Residential mortgage-backed securities (a) 7,192 122 40 7,274 State and municipal securities 24 — 1 23 Corporate debt securities 51 — — 51 Equity and other non-debt securities 242 1 1 242 Total investment securities available-for-sale (b) $ 8,035 $ 123 $ 42 $ 8,116 Investment securities held-to-maturity (c): Residential mortgage-backed securities (a) $ 1,935 $ — $ 2 $ 1,933 (a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (b) Included auction-rate securities at amortized cost and fair value of $80 million and $79 million , respectively as of September 30, 2015 and $137 million and $136 million , respectively, as of December 31, 2014 . (c) The amortized cost of investment securities held-to-maturity included net unrealized losses of $17 million at September 30, 2015 and $23 million at December 31, 2014 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 September 30, 2015 and December 31, 2014 follows: Temporarily Impaired Less than 12 Months 12 Months or more Total (in millions) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2015 Residential mortgage-backed securities (b) $ 642 $ 3 $ 2,071 $ 37 $ 2,713 $ 40 State and municipal securities (c) — — 9 — (a) 9 — (a) Corporate debt securities (c) — — 1 — (a) 1 — (a) Equity and other non-debt securities (c) 70 1 — — 70 1 Total temporarily impaired securities $ 712 $ 4 $ 2,081 $ 37 $ 2,793 $ 41 December 31, 2014 U.S. Treasury and other U.S. government agency securities $ 298 $ — (a) $ — $ — $ 298 $ — (a) Residential mortgage-backed securities (b) 626 3 3,112 71 3,738 74 State and municipal securities (c) — — 22 1 22 1 Corporate debt securities (c) — — 1 — (a) 1 — (a) Equity and other non-debt securities (c) — — 112 1 112 1 Total temporarily impaired securities $ 924 $ 3 $ 3,247 $ 73 $ 4,171 $ 76 (a) Unrealized losses less than $0.5 million. (b) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (c) Auction-rate securities. At September 30, 2015 , the Corporation had 123 securities in an unrealized loss position with no credit impairment, including 68 residential mortgage-backed securities, 38 auction-rate preferred securities, 16 state and municipal auction-rate securities, and one corporate auction-rate debt security. As of September 30, 2015 , approximately 94 percent of the aggregate par value of auction-rate securities have been redeemed or sold since acquisition, of which approximately 91 percent were redeemed at or above cost. The unrealized losses for these securities resulted from changes in market interest rates and liquidity. The Corporation ultimately expects full collection of the carrying amount of these securities, does not intend to sell the securities in an unrealized loss position, and it is not more-likely-than-not that the Corporation will be required to sell the securities in an unrealized loss position prior to recovery of amortized cost. The Corporation does not consider these securities to be other-than-temporarily impaired at September 30, 2015 . Sales, calls and write-downs of investment securities available-for-sale resulted in the following gains and losses recorded in “net securities losses” on the consolidated statements of comprehensive income, computed based on the adjusted cost of the specific security. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Securities gains $ — $ — $ — $ 1 Securities losses — (1 ) (2 ) (1 ) Net securities losses $ — $ (1 ) $ (2 ) $ — 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 September 30, 2015 Amortized Cost Fair Value Amortized Cost Fair Value Contractual maturity Within one year $ 74 $ 74 $ — $ — After one year through five years 1,123 1,136 — — After five years through ten years 929 976 — — After ten years 6,290 6,357 1,863 1,872 Subtotal 8,416 8,543 1,863 1,872 Equity and other non-debt securities 206 206 Total investment securities $ 8,622 $ 8,749 $ 1,863 $ 1,872 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 $7.4 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 September 30, 2015 , investment securities with a carrying value of $2.9 billion were pledged where permitted or required by law to secure $2.1 billion of liabilities, primarily public and other deposits of state and local government agencies and derivative instruments.

Credit Quality And Allowance Fo

Credit Quality And Allowance For Credit Losses	9 Months Ended
	Sep. 30, 2015
Credit Quality And Allowance For Credit Losses [Abstract]
Credit Quality And Allowance For Credit Losses	CREDIT QUALITY AND ALLOWANCE FOR CREDIT LOSSES The following table presents an aging analysis of the recorded balance of loans. Loans Past Due and Still Accruing (in millions) 30-59 Days 60-89 Days 90 Days or More Total Nonaccrual Loans Current Loans Total Loans September 30, 2015 Business loans: Commercial $ 83 $ 8 $ 2 $ 93 $ 214 $ 31,470 $ 31,777 Real estate construction: Commercial Real Estate business line (a) 4 — — 4 — 1,558 1,562 Other business lines (b) 1 — — 1 1 310 312 Total real estate construction 5 — — 5 1 1,868 1,874 Commercial mortgage: Commercial Real Estate business line (a) 21 — — 21 17 1,964 2,002 Other business lines (b) 13 3 2 18 49 6,718 6,785 Total commercial mortgage 34 3 2 39 66 8,682 8,787 Lease financing — — — — 8 743 751 International 3 — 1 4 8 1,370 1,382 Total business loans 125 11 5 141 297 44,133 44,571 Retail loans: Residential mortgage 12 1 — 13 31 1,836 1,880 Consumer: Home equity 5 1 — 6 28 1,680 1,714 Other consumer 2 — — 2 1 774 777 Total consumer 7 1 — 8 29 2,454 2,491 Total retail loans 19 2 — 21 60 4,290 4,371 Total loans $ 144 $ 13 $ 5 $ 162 $ 357 $ 48,423 $ 48,942 December 31, 2014 Business loans: Commercial $ 58 $ 13 $ 1 $ 72 $ 109 $ 31,339 $ 31,520 Real estate construction: Commercial Real Estate business line (a) 3 — — 3 1 1,602 1,606 Other business lines (b) 12 — — 12 1 336 349 Total real estate construction 15 — — 15 2 1,938 1,955 Commercial mortgage: Commercial Real Estate business line (a) 8 1 1 10 22 1,758 1,790 Other business lines (b) 16 12 2 30 73 6,711 6,814 Total commercial mortgage 24 13 3 40 95 8,469 8,604 Lease financing — — — — — 805 805 International 9 — — 9 — 1,487 1,496 Total business loans 106 26 4 136 206 44,038 44,380 Retail loans: Residential mortgage 9 2 — 11 36 1,784 1,831 Consumer: Home equity 5 3 — 8 30 1,620 1,658 Other consumer 12 — 1 13 1 710 724 Total consumer 17 3 1 21 31 2,330 2,382 Total retail loans 26 5 1 32 67 4,114 4,213 Total loans $ 132 $ 31 $ 5 $ 168 $ 273 $ 48,152 $ 48,593 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate. The following table presents loans by credit quality indicator, based on internal risk ratings assigned to each business loan at the time of approval and subjected to subsequent reviews, generally at least annually, and to pools of retail loans with similar risk characteristics. Internally Assigned Rating (in millions) Pass (a) Special Mention (b) Substandard (c) Nonaccrual (d) Total September 30, 2015 Business loans: Commercial $ 29,571 $ 1,035 $ 957 $ 214 $ 31,777 Real estate construction: Commercial Real Estate business line (e) 1,554 — 8 — 1,562 Other business lines (f) 303 — 8 1 312 Total real estate construction 1,857 — 16 1 1,874 Commercial mortgage: Commercial Real Estate business line (e) 1,920 33 32 17 2,002 Other business lines (f) 6,441 160 135 49 6,785 Total commercial mortgage 8,361 193 167 66 8,787 Lease financing 719 16 8 8 751 International 1,281 69 24 8 1,382 Total business loans 41,789 1,313 1,172 297 44,571 Retail loans: Residential mortgage 1,816 1 32 31 1,880 Consumer: Home equity 1,682 1 3 28 1,714 Other consumer 757 9 10 1 777 Total consumer 2,439 10 13 29 2,491 Total retail loans 4,255 11 45 60 4,371 Total loans $ 46,044 $ 1,324 $ 1,217 $ 357 $ 48,942 December 31, 2014 Business loans: Commercial $ 30,310 $ 560 $ 541 $ 109 $ 31,520 Real estate construction: Commercial Real Estate business line (e) 1,594 11 — 1 1,606 Other business lines (f) 336 7 5 1 349 Total real estate construction 1,930 18 5 2 1,955 Commercial mortgage: Commercial Real Estate business line (e) 1,652 69 47 22 1,790 Other business lines (f) 6,434 138 169 73 6,814 Total commercial mortgage 8,086 207 216 95 8,604 Lease financing 778 26 1 — 805 International 1,468 15 13 — 1,496 Total business loans 42,572 826 776 206 44,380 Retail loans: Residential mortgage 1,790 2 3 36 1,831 Consumer: Home equity 1,620 — 8 30 1,658 Other consumer 718 3 2 1 724 Total consumer 2,338 3 10 31 2,382 Total retail loans 4,128 5 13 67 4,213 Total loans $ 46,700 $ 831 $ 789 $ 273 $ 48,593 (a) Includes all loans not included in the categories of special mention, substandard or nonaccrual. (b) Special mention loans are accruing loans that have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date. (c) Substandard loans are accruing loans that have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans also are distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. This category is generally consistent with the "substandard" category as defined by regulatory authorities. (d) Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-55 in the Corporation's 2014 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities. (e) Primarily loans to real estate developers. (f) Primarily loans secured by owner-occupied real estate. The following table summarizes nonperforming assets. (in millions) September 30, 2015 December 31, 2014 Nonaccrual loans $ 357 $ 273 Reduced-rate loans (a) 12 17 Total nonperforming loans 369 290 Foreclosed property (b) 12 10 Total nonperforming assets $ 381 $ 300 (a) Reduced-rate business loans were zero at both September 30, 2015 and December 31, 2014 , and reduced-rate retail loans were $12 million and $17 million at September 30, 2015 and December 31, 2014 , respectively. (b) Foreclosed residential real estate properties. Nonaccrual loans included retail loans secured by residential real estate properties in process of foreclosure of $1 million at September 30, 2015 . Allowance for Credit Losses The following table details the changes in the allowance for loan losses and related loan amounts. 2015 2014 (in millions) Business Loans Retail Loans Total Business Loans Retail Loans Total Three Months Ended September 30 Allowance for loan losses: Balance at beginning of period $ 563 $ 55 $ 618 $ 528 $ 63 $ 591 Loan charge-offs (31 ) (3 ) (34 ) (20 ) (4 ) (24 ) Recoveries on loans previously charged-off 10 1 11 19 2 21 Net loan charge-offs (21 ) (2 ) (23 ) (1 ) (2 ) (3 ) Provision for loan losses 25 3 28 2 2 4 Foreign currency translation adjustment (1 ) — (1 ) — — — Balance at end of period $ 566 $ 56 $ 622 $ 529 $ 63 $ 592 Nine Months Ended September 30 Allowance for loan losses: Balance at beginning of period $ 534 $ 60 $ 594 $ 531 $ 67 $ 598 Loan charge-offs (83 ) (9 ) (92 ) (71 ) (11 ) (82 ) Recoveries on loans previously charged-off 38 5 43 50 8 58 Net loan charge-offs (45 ) (4 ) (49 ) (21 ) (3 ) (24 ) Provision for loan losses 79 — 79 19 (1 ) 18 Foreign currency translation adjustment (2 ) — (2 ) — — — Balance at end of period $ 566 $ 56 $ 622 $ 529 $ 63 $ 592 As a percentage of total loans 1.27 % 1.29 % 1.27 % 1.21 % 1.52 % 1.24 % September 30 Allowance for loan losses: Individually evaluated for impairment $ 47 $ — $ 47 $ 40 $ — $ 40 Collectively evaluated for impairment 519 56 575 489 63 552 Total allowance for loan losses $ 566 $ 56 $ 622 $ 529 $ 63 $ 592 Loans: Individually evaluated for impairment $ 338 $ 51 $ 389 $ 204 $ 44 $ 248 Collectively evaluated for impairment 44,233 4,318 48,551 43,384 4,073 47,457 Purchased credit impaired (PCI) loans — 2 2 — 3 3 Total loans evaluated for impairment $ 44,571 $ 4,371 $ 48,942 $ 43,588 $ 4,120 $ 47,708 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 September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Balance at beginning of period $ 50 $ 42 $ 41 $ 36 Charge-offs on lending related commitments (a) — — (1 ) — Provision for credit losses on lending-related commitments (2 ) 1 8 7 Balance at end of period $ 48 $ 43 $ 48 $ 43 (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 September 30, 2015 Business loans: Commercial $ 60 $ 216 $ 276 $ 327 $ 37 Real estate construction: Other business lines (a) — 1 1 1 — Commercial mortgage: Commercial Real Estate business line (b) 7 8 15 38 2 Other business lines (a) 6 30 36 52 5 Total commercial mortgage 13 38 51 90 7 International — 10 10 17 3 Total business loans 73 265 338 435 47 Retail loans: Residential mortgage 31 — 31 32 — Consumer: Home equity 12 — 12 16 — Other consumer 8 — 8 11 — Total consumer 20 — 20 27 — Total retail loans (c) 51 — 51 59 — Total individually evaluated impaired loans $ 124 $ 265 $ 389 $ 494 $ 47 December 31, 2014 Business loans: Commercial $ 7 $ 103 $ 110 $ 148 $ 29 Real estate construction: Other business lines (a) — 1 1 1 — Commercial mortgage: Commercial Real Estate business line (b) — 19 19 41 8 Other business lines (a) 4 43 47 63 2 Total commercial mortgage 4 62 66 104 10 Total business loans 11 166 177 253 39 Retail loans: Residential mortgage 25 — 25 28 — Consumer: Home equity 12 — 12 16 — Other consumer 5 — 5 7 — Total consumer 17 — 17 23 — Total retail loans (c) 42 — 42 51 — Total individually evaluated impaired loans $ 53 $ 166 $ 219 $ 304 $ 39 (a) Primarily loans secured by owner-occupied real estate. (b) Primarily loans to real estate developers. (c) Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy changes which resulted in direct write-downs of restructured retail loans. The following table presents information regarding average individually evaluated impaired loans and the related interest recognized. Interest income recognized for the period primarily related to performing restructured loans. Individually Evaluated Impaired Loans 2015 2014 (in millions) Average Balance for the Period Interest Income Recognized for the Period Average Balance for the Period Interest Income Recognized for the Period Three Months Ended September 30 Business loans: Commercial $ 236 $ 1 $ 74 $ 1 Real estate construction: Commercial Real Estate business line (a) — — 16 — Commercial mortgage: Commercial Real Estate business line (a) 15 — 49 — Other business lines (b) 37 1 70 — Total commercial mortgage 52 1 119 — International 10 — 1 — Total business loans 298 2 210 1 Retail loans: Residential mortgage 23 — 29 — Consumer loans: Home equity 12 — 11 — Other consumer 7 — 4 — Total consumer 19 — 15 — Total retail loans 42 — 44 — Total individually evaluated impaired loans $ 340 $ 2 $ 254 $ 1 Nine Months Ended September 30 Business loans: Commercial $ 172 $ 3 $ 68 $ 1 Real estate construction: Commercial Real Estate business line (a) — — 17 — Other business lines (b) — — 1 — Total real estate construction — — 18 — Commercial mortgage: Commercial Real Estate business line (a) 17 — 56 — Other business lines (b) 41 1 68 2 Total commercial mortgage 58 1 124 2 International 5 — 2 — Total business loans 235 4 212 3 Retail loans: Residential mortgage 23 — 31 — Consumer: Home equity 12 — 12 — Other consumer 6 — 4 — Total consumer 18 — 16 — Total retail loans 41 — 47 — Total individually evaluated impaired loans $ 276 $ 4 $ 259 $ 3 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate. Troubled Debt Restructurings The following tables detail the recorded balance at September 30, 2015 and 2014 of loans considered to be TDRs that were restructured during the three- and nine-month periods ended September 30, 2015 and 2014 , by type of modification. In cases of loans with more than one type of modification, the loans were categorized based on the most significant modification. 2015 2014 Type of Modification Type of Modification (in millions) Principal Deferrals (a) Interest Rate Reductions Total Modifications Principal Deferrals (a) Interest Rate Reductions Total Modifications Three Months Ended September 30 Business loans: Commercial $ 100 $ — $ 100 $ 2 $ — $ 2 Commercial mortgage: Commercial Real Estate business line (b) 7 — 7 — — — Other business lines (c) 3 — 3 6 — 6 Total commercial mortgage 10 — 10 6 — 6 International 2 — 2 — — — Total business loans 112 — 112 8 — 8 Retail loans: Residential mortgage 18 — 18 — — — Consumer: Home equity 1 1 2 1 — 1 Total retail loans 19 1 20 1 — 1 Total loans $ 131 $ 1 $ 132 $ 9 $ — $ 9 Nine Months Ended September 30 Business loans: Commercial $ 102 $ — $ 102 $ 3 $ — $ 3 Commercial mortgage: Commercial Real Estate business line (b) 9 — 9 — — — Other business lines (c) 7 — 7 10 — 10 Total commercial mortgage 16 — 16 10 — 10 International 2 — 2 1 — 1 Total business loans 120 — 120 14 — 14 Retail loans: Residential mortgage 18 — 18 — — — Consumer: Home equity 1 1 2 1 2 3 Total retail loans 19 1 20 1 2 3 Total loans $ 139 $ 1 $ 140 $ 15 $ 2 $ 17 (a) Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates. (b) Primarily loans to real estate developers. (c) Primarily loans secured by owner-occupied real estate. Commitments to lend additional funds to borrowers whose terms have been modified in TDRs were $1 million at September 30, 2015 and $3 million at December 31, 2014 . The majority of the modifications considered to be TDRs that occurred during the nine months ended September 30, 2015 and 2014 were principal deferrals. The Corporation charges interest on principal balances outstanding during deferral periods. Additionally, none of the modifications involved forgiveness of principal. As a result, the current and future financial effects of the recorded balance of loans considered to be TDRs that were restructured during the nine months ended September 30, 2015 and 2014 were insignificant. On an ongoing basis, the Corporation monitors the performance of modified loans to their restructured terms. In the event of a subsequent default, the allowance for loan losses continues to be reassessed on the basis of an individual evaluation of the loan. The following table presents information regarding the recorded balance at September 30, 2015 and 2014 of loans modified by principal deferral during the twelve-month periods ended September 30, 2015 and 2014 , and those principal deferrals which experienced a subsequent default during the three- and nine-month periods ended September 30, 2015 and 2014 . For principal deferrals, incremental deterioration in the credit quality of the loan, represented by a downgrade in the risk rating of the loan, for example, due to missed interest payments or a reduction of collateral value, is considered a subsequent default. 2015 2014 (in millions) Balance at September 30 Subsequent Default in the Three Months Ended September 30 Subsequent Default in the Nine Months Ended September 30 Balance at September 30 Subsequent Default in the Three Months Ended September 30 Subsequent Default in the Nine Months Ended September 30 Principal deferrals: Business loans: Commercial $ 108 $ 1 $ 3 $ 13 $ 6 $ 9 Commercial mortgage: Commercial Real Estate business line (a) 9 — — 4 — — Other business lines (b) 7 — 1 10 4 4 Total commercial mortgage 16 — 1 14 4 4 International 2 — — 1 — — Total business loans 126 1 4 28 10 13 Retail loans: Residential mortgage 18 (c) — — 2 (c) — — Consumer: Home equity 1 (c) — — 2 (c) — — Total retail loans 19 — — 4 — — Total principal deferrals $ 145 $ 1 $ 4 $ 32 $ 10 $ 13 (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 September 30, 2015 and 2014 , loans with a carrying value of $2 million and $3 million , respectively, were modified by interest rate reduction. For reduced-rate loans a subsequent payment default is defined in terms of delinquency, when a principal or interest payment is 90 days past due. There were no subsequent payment defaults of reduced-rate loans during the three- and nine-month periods ended September 30, 2015 and 2014 . Purchased Credit-Impaired Loans Acquired loans are initially recorded at fair value with no carryover of any allowance for loan losses. Loans acquired with evidence of credit quality deterioration at acquisition for which it was probable that the Corporation would not be able to collect all contractual amounts due were accounted for as PCI loans. The Corporation aggregated the acquired PCI loans into pools of loans based on common risk characteristics. No allowance for loan losses was required on the acquired PCI loan pools at both September 30, 2015 and December 31, 2014 . The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at September 30, 2015 and December 31, 2014 were as follows. (in millions) September 30, 2015 December 31, 2014 Acquired PCI loans: Carrying amount $ 2 $ 2 Outstanding balance (principal and unpaid interest) 6 8 Changes in the accretable yield for acquired PCI loans for the three- and nine-month periods ended September 30, 2015 and 2014 were as follows. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Balance at beginning of period $ 1 $ 6 $ 1 $ 15 Reclassifications from nonaccretable 1 1 2 10 Accretion (1 ) (1 ) (2 ) (19 ) Balance at end of period $ 1 $ 6 $ 1 $ 6

Derivative And Credit-Related F

Derivative And Credit-Related Financial Instruments	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative And Credit-Related Financial Instruments	DERIVATIVE AND CREDIT-RELATED FINANCIAL INSTRUMENTS In the normal course of business, the Corporation enters into various transactions involving derivative and credit-related financial instruments to manage exposure to fluctuations in interest rate, foreign currency and other market risks and to meet the financing needs of customers (customer-initiated derivatives). These financial instruments involve, to varying degrees, elements of market and credit risk. Market and credit risk are included in the determination of fair value. Market risk is the potential loss that may result from movements in interest rates, foreign currency exchange rates or energy commodity prices that cause an unfavorable change in the value of a financial instrument. The Corporation manages this risk by establishing monetary exposure limits and monitoring compliance with those limits. Market risk inherent in interest rate and energy contracts entered into on behalf of customers is mitigated by taking offsetting positions, except in those circumstances when the amount, tenor and/or contract rate level results in negligible economic risk, whereby the cost of purchasing an offsetting contract is not economically justifiable. The Corporation mitigates most of the inherent market risk in foreign exchange contracts entered into on behalf of customers by taking offsetting positions and manages the remainder through individual foreign currency position limits and aggregate value-at-risk limits. These limits are established annually and reviewed quarterly. Market risk inherent in derivative instruments held or issued for risk management purposes is typically offset by changes in the fair value of the assets or liabilities being hedged. Credit risk is the possible loss that may occur in the event of nonperformance by the counterparty to a financial instrument. The Corporation attempts to minimize credit risk arising from customer-initiated derivatives by evaluating the creditworthiness of each customer, adhering to the same credit approval process used for traditional lending activities and obtaining collateral as deemed necessary. Derivatives with dealer counterparties are either cleared through a clearinghouse or settled directly with a single counterparty. For derivatives settled directly with dealer counterparties, the Corporation utilizes counterparty risk limits and monitoring procedures as well as master netting arrangements and bilateral collateral agreements to facilitate the management of credit risk. Master netting arrangements effectively reduce credit risk by permitting settlement of positive and negative positions and offset cash collateral held with the same counterparty on a net basis. Bilateral collateral agreements require daily exchange of cash or highly rated securities issued by the U.S. Treasury or other U.S. government entities to collateralize amounts due to either party beyond certain risk limits. At September 30, 2015 , counterparties with bilateral collateral agreements had pledged $143 million of marketable investment securities and deposited $342 million of cash with the Corporation to secure the fair value of contracts in an unrealized gain position, and the Corporation had pledged $12 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 September 30, 2015 was $5 million , for which the Corporation had pledged collateral of $1 million . The credit-risk-related contingent features require the Corporation's debt to maintain an investment grade credit rating from each of the major credit rating agencies. If the Corporation's debt were to fall below investment grade, the counterparties to the derivative instruments could require additional overnight collateral on derivative instruments in net liability positions. If the credit-risk-related contingent features underlying these agreements had been triggered on September 30, 2015 , the Corporation would have been required to assign an additional $4 million of collateral to its counterparties. Derivative Instruments Derivative instruments utilized by the Corporation are negotiated over-the-counter and primarily include swaps, caps and floors, forward contracts and options, each of which may relate to interest rates, energy commodity prices or foreign currency exchange rates. Swaps are agreements in which two parties periodically exchange cash payments based on specified indices applied to a specified notional amount until a stated maturity. Caps and floors are agreements which entitle the buyer to receive cash payments based on the difference between a specified reference rate or price and an agreed strike rate or price, applied to a specified notional amount until a stated maturity. Forward contracts are over-the-counter agreements to buy or sell an asset at a specified future date and price. Options are similar to forward contracts except the purchaser has the right, but not the obligation, to buy or sell the asset during a specified period or at a specified future date. Over-the-counter contracts are tailored to meet the needs of the counterparties involved and, therefore, contain a greater degree of credit risk and liquidity risk than exchange-traded contracts, which have standardized terms and readily available price information. The Corporation reduces exposure to market and liquidity risks from over-the-counter derivative instruments entered into for risk management purposes, and transactions entered into to mitigate the market risk associated with customer-initiated transactions, by conducting hedging transactions with investment grade domestic and foreign financial institutions and subjecting counterparties to credit approvals, limits and collateral monitoring procedures similar to those used in making other extensions of credit. In addition, certain derivative contracts executed bilaterally with a dealer counterparty in the over-the-counter market are cleared through a clearinghouse, whereby the clearinghouse becomes the counterparty to the transaction. The following table presents the composition of the Corporation’s derivative instruments held or issued for risk management purposes or in connection with customer-initiated and other activities at September 30, 2015 and December 31, 2014 . The table excludes commitments, warrants accounted for as derivatives and a derivative related to the Corporation’s 2008 sale of its remaining ownership of Visa shares. September 30, 2015 December 31, 2014 Fair Value Fair Value (in millions) Notional/ Contract Amount (a) Gross Derivative Assets Gross Derivative Liabilities Notional/ Contract Amount (a) Gross Derivative Assets Gross Derivative Liabilities Risk management purposes Derivatives designated as hedging instruments Interest rate contracts: Swaps - fair value - receive fixed/pay floating $ 2,525 $ 186 $ — $ 1,800 $ 175 $ — Derivatives used as economic hedges Foreign exchange contracts: Spot, forwards and swaps 632 1 1 508 4 — Total risk management purposes 3,157 187 1 2,308 179 — Customer-initiated and other activities Interest rate contracts: Caps and floors written 270 — — 274 — — Caps and floors purchased 270 — — 274 — — Swaps 12,073 189 140 11,780 153 102 Total interest rate contracts 12,613 189 140 12,328 153 102 Energy contracts: Caps and floors written 714 — 101 1,218 — 173 Caps and floors purchased 714 101 — 1,218 173 — Swaps 2,130 358 355 2,496 354 352 Total energy contracts 3,558 459 456 4,932 527 525 Foreign exchange contracts: Spot, forwards, options and swaps 2,028 50 43 1,994 35 34 Total customer-initiated and other activities 18,199 698 639 19,254 715 661 Total gross derivatives $ 21,356 885 640 $ 21,562 894 661 Amounts offset in the consolidated balance sheets: Netting adjustment - Offsetting derivative assets/liabilities (123 ) (123 ) (133 ) (133 ) Netting adjustment - Cash collateral received/posted (282 ) (6 ) (262 ) — Net derivatives included in the consolidated balance sheets (b) 480 511 499 528 Amounts not offset in the consolidated balance sheets: Marketable securities pledged under bilateral collateral agreements (141 ) (12 ) (239 ) (2 ) Net derivatives after deducting amounts not offset in the consolidated balance sheets $ 339 $ 499 $ 260 $ 526 (a) Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets. (b) Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $5 million and $2 million at September 30, 2015 and December 31, 2014 , respectively. Risk Management As an end-user, the Corporation employs a variety of financial instruments for risk management purposes, including cash instruments, such as investment securities, as well as derivative instruments. Activity related to these instruments is centered predominantly in the interest rate markets and mainly involves interest rate swaps. Various other types of instruments also may be used to manage exposures to market risks, including interest rate caps and floors, total return swaps, foreign exchange forward contracts and foreign exchange swap agreements. The Corporation entered into interest rate swap agreements for interest rate risk management purposes. These interest rate swap agreements effectively modify the Corporation’s exposure to interest rate risk by converting fixed-rate debt to a floating rate. These agreements involve the receipt of fixed-rate interest amounts in exchange for floating-rate interest payments over the life of the agreement, without an exchange of the underlying principal amount. Risk management fair value interest rate swaps generated net interest income of $18 million for both the three-month periods ended September 30, 2015 and 2014 , and $52 million and $54 million for the nine months ended September 30, 2015 and 2014 , respectively. The Corporation recognized $3 million of net gains and $1 million of net losses for the three months ended September 30, 2015 and 2014 , respectively, and $2 million of net gains and $1 million of net losses for the nine months ended September 30, 2015 and 2014 , respectively, for the ineffective portion of risk management derivative instruments designated as fair value hedges of fixed-rate debt, included in "other noninterest income" in the consolidated statements of comprehensive income. 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 $1 million of net gains for both the three- and nine-month periods ended September 30, 2015 and an insignificant amount of net gains for the three- and nine-month periods ended September 30, 2014 on risk management derivative instruments used as economic hedges, included in "other noninterest income" in the consolidated statements of comprehensive 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 September 30, 2015 and December 31, 2014 . Weighted Average (dollar amounts in millions) Notional Amount Remaining Maturity (in years) Receive Rate Pay Rate (a) September 30, 2015 Swaps - fair value - receive fixed/pay floating rate Medium- and long-term debt designation $ 2,525 5.3 3.89 % 1.00 % December 31, 2014 Swaps - fair value - receive fixed/pay floating rate Medium- and long-term debt designation 1,800 4.6 4.54 0.49 (a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at September 30, 2015 and December 31, 2014 . Management believes these hedging strategies achieve the desired relationship between the rate maturities of assets and funding sources which, in turn, reduce the overall exposure of net interest income to interest rate risk, although there can be no assurance that such strategies will be successful. Customer-Initiated and Other The Corporation enters into derivative transactions at the request of customers and generally takes offsetting positions with dealer counterparties to mitigate the inherent market risk. Income primarily results from the spread between the customer derivative and the offsetting dealer position. For customer-initiated foreign exchange contracts where offsetting positions have not been taken, the Corporation manages the remaining inherent market risk through individual foreign currency position limits and aggregate value-at-risk limits. These limits are established annually and reviewed quarterly. For those customer-initiated derivative contracts which were not offset or where the Corporation holds a position within the limits described above, the Corporation recognized no net gains and $1 million of net gains in “other noninterest income” in the consolidated statements of comprehensive income for the three- and nine-month periods ended September 30, 2015 , respectively, and $1 million of net gains for both the three- and nine-month periods ended September 30, 2014 . Fair values of customer-initiated and other derivative instruments represent the net unrealized gains or losses on such contracts and are recorded in the consolidated balance sheets. Changes in fair value are recognized in the consolidated statements of comprehensive income. The net gains recognized in income on customer-initiated derivative instruments, net of the impact of offsetting positions, were as follows . Three Months Ended September 30, Nine Months Ended September 30, (in millions) Location of Gain 2015 2014 2015 2014 Interest rate contracts Other noninterest income $ 4 $ 3 $ 11 $ 11 Energy contracts Other noninterest income 1 1 2 1 Foreign exchange contracts Foreign exchange income 9 9 27 29 Total $ 14 $ 13 $ 40 $ 41 Credit-Related Financial Instruments The Corporation issues off-balance sheet financial instruments in connection with commercial and consumer lending activities. The Corporation’s credit risk associated with these instruments is represented by the contractual amounts indicated in the following table. (in millions) September 30, 2015 December 31, 2014 Unused commitments to extend credit: Commercial and other $ 26,887 $ 27,905 Bankcard, revolving check credit and home equity loan commitments 2,376 2,151 Total unused commitments to extend credit $ 29,263 $ 30,056 Standby letters of credit $ 3,993 $ 3,880 Commercial letters of credit 59 75 Other credit-related financial instruments 1 1 The Corporation maintains an allowance to cover probable credit losses inherent in lending-related commitments, including unused commitments to extend credit, letters of credit and financial guarantees. At September 30, 2015 and December 31, 2014 , the allowance for credit losses on lending-related commitments, included in “accrued expenses and other liabilities” on the consolidated balance sheets, was $48 million and $41 million , respectively. Unused Commitments to Extend Credit Commitments to extend credit are legally binding agreements to lend to a customer, provided there is no violation of any condition established in the contract. These commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Corporation. Commercial and other unused commitments are primarily variable rate commitments. The allowance for credit losses on lending-related commitments included $34 million and $30 million at September 30, 2015 and December 31, 2014 , respectively, for probable credit losses inherent in the Corporation’s unused commitments to extend credit. Standby and Commercial Letters of Credit Standby letters of credit represent conditional obligations of the Corporation which guarantee the performance of a customer to a third party. Standby letters of credit are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing and similar transactions. Commercial letters of credit are issued to finance foreign or domestic trade transactions. These contracts expire in decreasing amounts through the year 2022 . The Corporation may enter into participation arrangements with third parties that effectively reduce the maximum amount of future payments which may be required under standby and commercial letters of credit. These risk participations covered $295 million and $316 million , respectively, of the $4.1 billion and $4.0 billion standby and commercial letters of credit outstanding at September 30, 2015 and December 31, 2014 , respectively. The carrying value of the Corporation’s standby and commercial letters of credit, included in “accrued expenses and other liabilities” on the consolidated balance sheets, totaled $54 million at September 30, 2015 , including $40 million in deferred fees and $14 million in the allowance for credit losses on lending-related commitments. At December 31, 2014 , the comparable amounts were $55 million , $44 million and $11 million , respectively. The following table presents a summary of criticized standby and commercial letters of credit at September 30, 2015 and December 31, 2014 . The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines. (dollar amounts in millions) September 30, 2015 December 31, 2014 Total criticized standby and commercial letters of credit $ 104 $ 79 As a percentage of total outstanding standby and commercial letters of credit 2.6 % 2.0 % Other Credit-Related Financial Instruments The Corporation enters into credit risk participation agreements, under which the Corporation assumes credit exposure associated with a borrower’s performance related to certain interest rate derivative contracts. The Corporation is not a party to the interest rate derivative contracts and only enters into these credit risk participation agreements in instances in which the Corporation is also a party to the related loan participation agreement for such borrowers. The Corporation manages its credit risk on the credit risk participation agreements by monitoring the creditworthiness of the borrowers, which is based on the normal credit review process had it entered into the derivative instruments directly with the borrower. The notional amount of such credit risk participation agreement reflects the pro-rata share of the derivative instrument, consistent with its share of the related participated loan. As of September 30, 2015 and December 31, 2014 , the total notional amount of the credit risk participation agreements was approximately $653 million and $598 million , respectively, and the fair value, included in customer-initiated interest rate contracts recorded in "accrued expenses and other liabilities" on the consolidated balance sheets, was insignificant at both September 30, 2015 and December 31, 2014 . 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 $12 million and $7 million at September 30, 2015 and December 31, 2014 , respectively. In the event of default, the lead bank has the ability to liquidate the assets of the borrower, in which case the lead bank would be required to return a percentage of the recouped assets to the participating banks. As of September 30, 2015 , the weighted average remaining maturity of outstanding credit risk participation agreements was 2.4 years. In 2008, the Corporation sold its remaining ownership of Visa Class B shares and entered into a derivative contract. Under the terms of the derivative contract, the Corporation will compensate the counterparty primarily for dilutive adjustments made to the conversion factor of the Visa Class B shares to Class A shares based on the ultimate outcome of litigation involving Visa. Conversely, the Corporation will be compensated by the counterparty for any increase in the conversion factor from anti-dilutive adjustments. The notional amount of the derivative contract was equivalent to approximately 780,000 Visa Class B shares. The fair value of the derivative liability, included in "accrued expenses and other liabilities" on the consolidated balance sheets, was $1 million at both September 30, 2015 and December 31, 2014 .

Variable Interest Entities (VIE

Variable Interest Entities (VIEs)	9 Months Ended
	Sep. 30, 2015
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Variable Interest Entities (VIEs)	VARIABLE INTEREST ENTITIES (VIEs) The Corporation evaluates its interest in certain entities to determine if these entities meet the definition of a VIE and whether the Corporation is the primary beneficiary and should consolidate the entity based on the variable interests it held both at inception and when there is a change in circumstances that requires a reconsideration. The Corporation holds ownership interests in funds in the form of limited partnerships or limited liability companies (LLCs) investing in affordable housing projects that qualify for the low-income housing tax credit (LIHTC). The Corporation also directly invests in limited partnerships and LLCs which invest in community development projects which generate similar tax credits to investors. As an investor, the Corporation obtains income tax credits and deductions from the operating losses of these tax credit entities. These tax credit entities meet the definition of a VIE; however, the Corporation is not the primary beneficiary of the entities, as the general partner or the managing member has both the power to direct the activities that most significantly impact the economic performance of the entities and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. While the partnership/LLC agreements allow the limited partners/investor members, through a majority vote, to remove the general partner/managing member, this right is not deemed to be substantive as the general partner/managing member can only be removed for cause. The Corporation accounts for its interests in LIHTC entities using the proportional amortization method. Exposure to loss as a result of the Corporation’s involvement with LIHTC entities at September 30, 2015 was limited to approximately $383 million . Ownership interests in other community development projects which generate similar tax credits to investors (other tax credit entities) are accounted for under either the cost or equity method. Exposure to loss as a result of the Corporation's involvement in other tax credit entities at September 30, 2015 was limited to approximately $10 million . Investment balances, including all legally binding commitments to fund future investments, are included in “accrued income and other assets” on the consolidated balance sheets. A liability is recognized in “accrued expenses and other liabilities” on the consolidated balance sheets for all legally binding unfunded commitments to fund tax credit entities ( $126 million at September 30, 2015 ). Amortization and other write-downs of LIHTC investments are presented on a net basis as a component of the "provision for income taxes" on the consolidated statements of comprehensive income, while amortization and write-downs of other tax credit investments are recorded in “other noninterest income." The income tax credits and deductions are recorded as a reduction of income tax expense and a reduction of federal income taxes payable. The Corporation provided no financial or other support that was not contractually required to any of the above VIEs during the nine months ended September 30, 2015 and 2014 . The following table summarizes the impact of these tax credit entities on line items on the Corporation’s consolidated statements of comprehensive income. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Other noninterest income: Amortization of other tax credit investments $ — $ (2 ) $ 1 $ (5 ) Provision for income taxes: Amortization of LIHTC investments 15 15 45 43 Low income housing tax credits (15 ) (15 ) (45 ) (43 ) Other tax benefits related to tax credit entities (5 ) (6 ) (15 ) (19 ) Total provision for income taxes $ (5 ) $ (6 ) (15 ) (19 ) For further information on the Corporation’s consolidation policy, see Note 1 to the consolidated financial statements in the Corporation's 2014 Annual Report.

Medium- And Long-Term Debt

Medium- And Long-Term Debt	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Medium- And Long-Term Debt	MEDIUM- AND LONG-TERM DEBT Medium- and long-term debt is summarized as follows: (in millions) September 30, 2015 December 31, 2014 Parent company Subordinated notes: 4.80% subordinated notes due 2015 (a) $ — $ 304 3.80% subordinated notes due 2026 (a) 264 257 Medium-term notes: 3.00% notes due 2015 — 300 2.125% notes due 2019 (a) 354 347 Total parent company 618 1,208 Subsidiaries Subordinated notes: 5.75% subordinated notes due 2016 (a) (b) 662 670 5.20% subordinated notes due 2017 (a) 538 548 4.00% subordinated notes due 2025 (a) 358 — 7.875% subordinated notes due 2026 (a) 228 227 Total subordinated notes 1,786 1,445 Medium-term notes: 2.50% notes due 2020 (a) 680 — Other notes: 6.0% - 6.4% fixed-rate notes due 2020 16 22 Total subsidiaries 2,482 1,467 Total medium- and long-term debt $ 3,100 $ 2,675 (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. The remaining amount is not swapped. Subordinated notes with remaining maturities greater than one year qualify as Tier 2 capital. Comerica Bank, a wholly-owned subsidiary of the Corporation (the Bank), is a member of the FHLB, which provides short- and long-term funding to its members through advances collateralized by real estate-related assets. Actual borrowing capacity is contingent on the amount of collateral available to be pledged to the FHLB. At September 30, 2015 , $14 billion of real estate-related loans were pledged to the FHLB as blanket collateral for potential future borrowings of approximately $6 billion . In the second quarter 2015, the Bank issued $500 million of 2.50% medium-term notes due 2020 , which were swapped to a floating rate based on six-month LIBOR. Proceeds were used for general corporate purposes. In the third quarter 2015, the Bank issued $350 million of 4.00% subordinated notes due 2025 and $175 million of 2.50% medium-term notes due 2020 , both of which were swapped to a floating rate based on six-month LIBOR. Proceeds were used for general corporate purposes.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE LOSS The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the nine months ended September 30, 2015 and 2014 , including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss). Nine Months Ended September 30, (in millions) 2015 2014 Accumulated net unrealized gains (losses) on investment securities: Balance at beginning of period, net of tax $ 37 $ (68 ) Net unrealized holding gains arising during the period 44 85 Less: Provision for income taxes 16 30 Net unrealized holding gains arising during the period, net of tax 28 55 Less: Net realized (losses) gains included in net securities (losses) gains (2 ) 1 Less: Benefit for income taxes (1 ) — Reclassification adjustment for net securities (losses) gains included in net income, net of tax (1 ) 1 Less: Net losses realized as a yield adjustment in interest on investment securities (6 ) — Less: Benefit for income taxes (2 ) — Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax (4 ) — Change in net unrealized gains (losses) on investment securities, net of tax 33 54 Balance at end of period, net of tax $ 70 $ (14 ) Accumulated defined benefit pension and other postretirement plans adjustment: Balance at beginning of period, net of tax $ (449 ) $ (323 ) Amortization of actuarial net loss 53 30 Amortization of prior service cost — 1 Amounts recognized in salaries and benefits expense 53 31 Less: Provision for income taxes 19 11 Change in defined benefit pension and other postretirement plans adjustment, net of tax 34 20 Balance at end of period, net of tax $ (415 ) $ (303 ) Total accumulated other comprehensive loss at end of period, net of tax $ (345 ) $ (317 )

Net Income Per Common Share

Net Income Per Common Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Income Per Common Share	NET INCOME PER COMMON SHARE Basic and diluted net income per common share are presented in the following table. Three Months Ended September 30, Nine Months Ended September 30, (in millions, except per share data) 2015 2014 2015 2014 Basic and diluted Net income $ 136 $ 154 $ 405 $ 444 Less: Income allocated to participating securities 2 2 5 6 Net income attributable to common shares $ 134 $ 152 $ 400 $ 438 Basic average common shares 176 179 176 179 Basic net income per common share $ 0.76 $ 0.85 $ 2.27 $ 2.44 Basic average common shares 176 179 176 179 Dilutive common stock equivalents: Net effect of the assumed exercise of stock options 2 2 2 2 Net effect of the assumed exercise of warrants 3 4 4 5 Diluted average common shares 181 185 182 186 Diluted net income per common share $ 0.74 $ 0.82 $ 2.20 $ 2.35 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 September 30, Nine Months Ended September 30, (shares in millions) 2015 2014 2015 2014 Average outstanding options 4.6 6.0 5.4 7.3 Range of exercise prices $46.68 - $60.82 $50.87 - $60.82 $46.68 - $60.82 $48.17 - $61.94

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS Net periodic benefit costs are charged to "employee benefits expense" on the consolidated statements of comprehensive income. The components of net periodic benefit cost for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows. Qualified Defined Benefit Pension Plan Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Service cost $ 9 $ 7 $ 27 $ 22 Interest cost 22 22 66 66 Expected return on plan assets (40 ) (33 ) (120 ) (99 ) Amortization of prior service cost 1 1 3 4 Amortization of net loss 15 9 44 24 Net periodic defined benefit cost $ 7 $ 6 $ 20 $ 17 Non-Qualified Defined Benefit Pension Plan Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Service cost $ 1 $ 1 $ 3 $ 3 Interest cost 2 2 7 7 Amortization of prior service credit (1 ) (1 ) (3 ) (3 ) Amortization of net loss 3 2 8 5 Net periodic defined benefit cost $ 5 $ 4 $ 15 $ 12 Postretirement Benefit Plan Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Interest cost $ 1 $ — $ 2 $ 2 Expected return on plan assets (1 ) (1 ) (3 ) (3 ) Amortization of net loss — 1 1 1 Net periodic postretirement benefit cost $ — $ — $ — $ — For further information on the Corporation's employee benefit plans, refer to Note 17 to the consolidated financial statements in the Corporation's 2014 Annual Report.

Income Taxes And Tax-Related It

Income Taxes And Tax-Related Items	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes and Tax-Related Items	INCOME TAXES AND TAX-RELATED ITEMS At September 30, 2015 , net unrecognized tax benefits were $22 million , compared to $14 million at December 31, 2014 . The Corporation anticipates that it is reasonably possible that final settlement of federal and state tax issues will result in a decrease in net unrecognized tax benefits of $8 million within the next twelve months. Included in "accrued expense and other liabilities" on the consolidated balance sheets was a $3 million liability for tax-related interest and penalties at September 30, 2015 compared to $2 million at December 31, 2014 . Net deferred tax assets were $132 million at September 30, 2015 , compared to $130 million at December 31, 2014 . Deferred tax assets were evaluated for realization and it was determined that no valuation allowance was needed at both September 30, 2015 and December 31, 2014 . This conclusion was based on sufficient taxable income in the carryback period and projected future reversals of existing taxable temporary differences to absorb the deferred tax assets. In the ordinary course of business, the Corporation enters into certain transactions that have tax consequences. From time to time, the Internal Revenue Service (IRS) 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	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities	CONTINGENT LIABILITIES Legal Proceedings As previously reported in the Corporation's Form 10-K for the year ended December 31, 2014 and Form 10-Q for the periods ended March 31, 2015 and June 30, 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 and $8 million were included in "other noninterest expenses" on the consolidated statements of income for the three-month periods ended September 30, 2015 and 2014 , respectively, and $15 million and $18 million for the nine-month periods ended September 30, 2015 and 2014 , respectively. For matters where a loss is not probable, the Corporation has not established legal reserves. The Corporation believes the estimate of the aggregate range of reasonably possible losses, in excess of reserves established, for all legal proceedings in which it is involved is from zero to approximately $32 million at September 30, 2015 . This estimated aggregate range of reasonably possible losses is based upon currently available information for those proceedings in which the Corporation is involved, taking into account the Corporation’s best estimate of such losses for those cases for which such estimate can be made. For certain cases, the Corporation does not believe that an estimate can currently be made. The Corporation’s estimate involves significant judgment, given the varying stages of the proceedings (including the fact that many are currently in preliminary stages), the existence in certain proceedings of multiple defendants (including the Corporation) whose share of liability has yet to be determined, the numerous yet-unresolved issues in many of the proceedings (including issues regarding class certification and the scope of many of the claims) and the attendant uncertainty of the various potential outcomes of such proceedings. Accordingly, the Corporation’s estimate will change from time to time, and actual losses may be more or less than the current estimate. In the event of unexpected future developments, it is possible that the ultimate resolution of these matters, if unfavorable, may be material to the Corporation's consolidated financial condition, consolidated results of operations or consolidated cash flows. For information regarding income tax contingencies, refer to Note 11 .

Business Segment Information

Business Segment Information	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Business Segment Information	BUSINESS SEGMENT INFORMATION The Corporation has strategically aligned its operations into three major business segments: the Business Bank, the Retail Bank and Wealth Management. These business segments are differentiated based on the type of customer and the related products and services provided. In addition to the three major business segments, the Finance Division is also reported as a segment. Business segment results are produced by the Corporation’s internal management accounting system. This system measures financial results based on the internal business unit structure of the Corporation. The performance of the business segments is not comparable with the Corporation's consolidated results and is not necessarily comparable with similar information for any other financial institution. Additionally, because of the interrelationships of the various segments, the information presented is not indicative of how the segments would perform if they operated as independent entities. The management accounting system assigns balance sheet and income statement items to each business segment using certain methodologies, which are regularly reviewed and refined. These methodologies may be modified as the management accounting system is enhanced and changes occur in the organizational structure and/or product lines. For comparability purposes, amounts in all periods are based on business segments and methodologies in effect at September 30, 2015 . In the second quarter 2014, the Corporation enhanced the approach used to determine the standard reserve factors used in estimating the allowance for credit losses, which had the effect of capturing certain elements in the standard reserve component that had formerly been included in the qualitative assessment. The impact of the change was largely neutral to the total allowance for loan losses at June 30, 2014. However, because standard reserves are allocated to the segments at the loan level, while qualitative reserves are allocated at the portfolio level, the impact of the methodology change on the allowance of each segment reflected the characteristics of the individual loans within each segment's portfolio, causing segment reserves to increase or decrease accordingly. As a result, the current year provision for credit losses within each segment is not comparable to prior period amounts. The following discussion provides information about the activities of each business segment. A discussion of the financial results and the factors impacting performance can be found in the section entitled "Business Segments" in the financial review. The Business Bank meets the needs of middle market businesses, multinational corporations and governmental entities by offering various products and services, including commercial loans and lines of credit, deposits, cash management, capital market products, international trade finance, letters of credit, foreign exchange management services and loan syndication services. The Retail Bank includes small business banking and personal financial services, consisting of consumer lending, consumer deposit gathering and mortgage loan origination. In addition to a full range of financial services provided to small business customers, this business segment offers a variety of consumer products, including deposit accounts, installment loans, credit cards, student loans, home equity lines of credit and residential mortgage loans. Wealth Management offers products and services consisting of fiduciary services, private banking, retirement services, investment management and advisory services, investment banking and brokerage services. This business segment also offers the sale of annuity products, as well as life, disability and long-term care insurance products. The Finance segment includes the Corporation’s securities portfolio and asset and liability management activities. This segment is responsible for managing the Corporation’s funding, liquidity and capital needs, performing interest sensitivity analysis and executing various strategies to manage the Corporation’s exposure to liquidity, interest rate risk and foreign exchange risk. The Other category includes discontinued operations, the income and expense impact of equity and cash, tax benefits not assigned to specific business segments, charges of an unusual or infrequent nature that are not reflective of the normal operations of the business segments and miscellaneous other expenses of a corporate nature. For further information on the methodologies which form the basis for these results refer to Note 22 to the consolidated financial statements in the Corporation's 2014 Annual Report. Business segment financial results are as follows: (dollar amounts in millions) Business Retail Wealth Management Finance Other Total Three Months Ended September 30, 2015 Earnings summary: Net interest income (expense) (FTE) $ 380 $ 158 $ 45 $ (162 ) $ 2 $ 423 Provision for credit losses 30 2 (3 ) — (3 ) 26 Noninterest income 145 49 59 15 (4 ) 264 Noninterest expenses 202 185 74 2 (2 ) 461 Provision (benefit) for income taxes (FTE) 99 7 12 (56 ) 2 64 Net income (loss) $ 194 $ 13 $ 21 $ (93 ) $ 1 $ 136 Net loan charge-offs (recoveries) $ 23 $ 1 $ (1 ) $ — $ — $ 23 Selected average balances: Assets $ 39,210 $ 6,518 $ 5,228 $ 12,177 $ 8,200 $ 71,333 Loans 38,113 5,835 5,024 — — 48,972 Deposits 31,397 23,079 4,188 212 264 59,140 Statistical data: Return on average assets (a) 1.98 % 0.23 % 1.62 % N/M N/M 0.76 % Efficiency ratio (b) 38.41 89.33 71.11 N/M N/M 67.08 (dollar amounts in millions) Business Retail Wealth Management Finance Other Total Three Months Ended September 30, 2014 Earnings summary: Net interest income (expense) (FTE) $ 376 $ 153 $ 45 $ (166 ) $ 7 $ 415 Provision for credit losses (4 ) — 7 — 2 5 Noninterest income 97 42 59 15 2 215 Noninterest expenses 152 185 78 (29 ) 11 397 Provision (benefit) for income taxes (FTE) 114 3 7 (49 ) (1 ) 74 Net income (loss) $ 211 $ 7 $ 12 $ (73 ) $ (3 ) $ 154 Net loan charge-offs (recoveries) $ (2 ) $ — $ 5 $ — $ — $ 3 Selected average balances: Assets $ 37,751 $ 6,273 $ 4,998 $ 11,023 $ 6,353 $ 66,398 Loans 36,746 5,605 4,808 — — 47,159 Deposits 28,815 22,042 3,924 128 254 55,163 Statistical data: Return on average assets (a) 2.24 % 0.12 % 0.98 % N/M N/M 0.93 % Efficiency ratio b) 32.12 94.64 75.00 N/M N/M 62.87 (a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity. (b) Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains. FTE – Fully Taxable Equivalent N/M – not meaningful (dollar amounts in millions) Business Bank Retail Bank Wealth Management Finance Other Total Nine Months Ended September 30, 2015 Earnings summary: Net interest income (expense) (FTE) $ 1,123 $ 466 $ 133 $ (470 ) $ 7 $ 1,259 Provision for credit losses 115 (14 ) (12 ) — (2 ) 87 Noninterest income 427 137 177 42 (3 ) 780 Noninterest expenses 578 542 225 7 4 1,356 Provision (benefit) for income taxes (FTE) 292 26 34 (162 ) 1 191 Net income (loss) $ 565 $ 49 $ 63 $ (273 ) $ 1 $ 405 Net loan charge-offs (recoveries) $ 54 $ 3 $ (8 ) $ — $ — $ 49 Selected average balances: Assets $ 39,002 $ 6,449 $ 5,137 $ 12,013 $ 7,087 $ 69,688 Loans 37,950 5,767 4,938 — — 48,655 Deposits 30,594 22,746 4,082 159 270 57,851 Statistical data: Return on average assets (a) 1.93 % 0.28 % 1.64 % N/M N/M 0.78 % Efficiency ratio (b) 37.27 89.91 71.97 N/M N/M 66.41 (dollar amounts in millions) Business Bank Retail Bank Wealth Management Finance Other Total Nine Months Ended September 30, 2014 Earnings summary: Net interest income (expense) (FTE) $ 1,120 $ 454 $ 135 $ (485 ) $ 19 $ 1,243 Provision for credit losses 48 (5 ) (11 ) — (7 ) 25 Noninterest income 288 124 181 44 6 643 Noninterest expenses 440 533 231 (24 ) 27 1,207 Provision (benefit) for income taxes (FTE) 314 17 34 (160 ) 5 210 Net income (loss) $ 606 $ 33 $ 62 $ (257 ) $ — $ 444 Net loan charge-offs $ 18 $ 6 $ — $ — $ — $ 24 Selected average balances: Assets $ 36,936 $ 6,241 $ 4,972 $ 11,069 $ 6,117 $ 65,335 Loans 35,964 5,572 4,791 — — 46,327 Deposits 27,727 21,854 3,708 246 246 53,781 Statistical data: Return on average assets (a) 2.19 % 0.20 % 1.65 % N/M N/M 0.91 % Efficiency ratio (b) 31.28 92.03 73.40 N/M N/M 63.99 (a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity. (b) Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains. FTE – Fully Taxable Equivalent N/M – not meaningful The Corporation operates in three primary markets - Texas, California, and Michigan, as well as in Arizona and Florida, with select businesses operating in several other states, and in Canada and Mexico. The Corporation produces market segment results for the Corporation’s three primary geographic markets as well as Other Markets. Other Markets includes Florida, Arizona, the International Finance division and businesses with a national perspective. The Finance & Other category includes the Finance segment and the Other category as previously described. Market segment results are provided as supplemental information to the business segment results and may not meet all operating segment criteria as set forth in GAAP. For comparability purposes, amounts in all periods are based on market segments and methodologies in effect at September 30, 2015 . A discussion of the financial results and the factors impacting performance can be found in the section entitled "Market Segments" in the financial review. Market segment financial results are as follows: (dollar amounts in millions) Michigan California Texas Other Finance Total Three Months Ended September 30, 2015 Earnings summary: Net interest income (expense) (FTE) $ 180 $ 187 $ 129 $ 87 $ (160 ) $ 423 Provision for credit losses 6 24 10 (11 ) (3 ) 26 Noninterest income 85 38 34 96 11 264 Noninterest expenses 152 102 97 110 — 461 Provision (benefit) for income taxes (FTE) 36 37 20 25 (54 ) 64 Net income (loss) $ 71 $ 62 $ 36 $ 59 $ (92 ) $ 136 Net loan charge-offs $ 9 $ 10 $ 4 $ — $ — $ 23 Selected average balances: Assets $ 13,856 $ 17,060 $ 11,578 $ 8,462 $ 20,377 $ 71,333 Loans 13,223 16,789 10,997 7,963 — 48,972 Deposits 21,946 18,372 10,753 7,593 476 59,140 Statistical data: Return on average assets (a) 1.23 % 1.27 % 1.16 % 2.82 % N/M 0.76 % Efficiency ratio (b) 57.49 45.28 59.54 59.86 N/M 67.08 (dollar amounts in millions) Michigan California Texas Other Finance Total Three Months Ended September 30, 2014 Earnings summary: Net interest income (expense) (FTE) $ 179 $ 182 $ 130 $ 83 $ (159 ) $ 415 Provision for credit losses (8 ) 14 3 (6 ) 2 5 Noninterest income 83 37 36 42 17 215 Noninterest expenses 166 102 96 51 (18 ) 397 Provision (benefit) for income taxes (FTE) 38 40 25 21 (50 ) 74 Net income (loss) $ 66 $ 63 $ 42 $ 59 $ (76 ) $ 154 Net loan charge-offs (recoveries) $ 3 $ 6 $ — $ (6 ) $ — $ 3 Selected average balances: Assets $ 13,724 $ 15,768 $ 11,835 $ 7,695 $ 17,376 $ 66,398 Loans 13,248 15,509 11,147 7,255 — 47,159 Deposits 21,214 16,350 10,633 6,584 382 55,163 Statistical data: Return on average assets (a) 1.19 % 1.47 % 1.40 % 3.07 % N/M 0.93 % Efficiency ratio (b) 62.91 46.49 57.91 41.46 N/M 62.87 (a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity. (b) Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains. FTE – Fully Taxable Equivalent N/M – not meaningful (dollar amounts in millions) Michigan California Texas Other Markets Finance & Other Total Nine Months Ended September 30, 2015 Earnings summary: Net interest income (expense) (FTE) $ 537 $ 543 $ 390 $ 252 $ (463 ) $ 1,259 Provision for credit losses (15 ) 24 74 6 (2 ) 87 Noninterest income 251 112 101 277 39 780 Noninterest expenses 436 300 287 322 11 1,356 Provision (benefit) for income taxes (FTE) 124 124 48 56 (161 ) 191 Net income (loss) $ 243 $ 207 $ 82 $ 145 $ (272 ) $ 405 Net loan charge-offs $ 10 $ 16 $ 12 $ 11 $ — $ 49 Selected average balances: Assets $ 13,815 $ 16,741 $ 11,881 $ 8,151 $ 19,100 $ 69,688 Loans 13,245 16,473 11,260 7,677 — 48,655 Deposits 21,788 17,500 10,907 7,227 429 57,851 Statistical data: Return on average assets (a) 1.42 % 1.48 % 0.88 % 2.38 % N/M 0.78 % Efficiency ratio (b) 55.27 45.88 58.38 60.61 N/M 66.41 (dollar amounts in millions) Michigan California Texas Other Markets Finance & Other Total Nine Months Ended September 30, 2014 Earnings summary: Net interest income (expense) (FTE) $ 544 $ 531 $ 403 $ 231 $ (466 ) $ 1,243 Provision for credit losses (13 ) 39 32 (26 ) (7 ) 25 Noninterest income 256 110 104 123 50 643 Noninterest expenses 486 298 275 145 3 1,207 Provision (benefit) for income taxes (FTE) 118 115 72 60 (155 ) 210 Net income (loss) $ 209 $ 189 $ 128 $ 175 $ (257 ) $ 444 Net loan charge-offs $ 13 $ 21 $ 7 $ (17 ) $ — $ 24 Selected average balances: Assets $ 13,797 $ 15,543 $ 11,525 $ 7,284 $ 17,186 $ 65,335 Loans 13,400 15,259 10,829 6,839 — 46,327 Deposits 20,853 15,506 10,743 6,187 492 53,781 Statistical data: Return on average assets (a) 1.27 % 1.53 % 1.42 % 3.20 % N/M 0.91 % Efficiency ratio (b) 60.67 46.57 54.13 41.16 N/M 63.99 (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)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Revenue Recognition	Revenue Recognition In the first quarter 2015, the Corporation entered into a new contract for an existing debit card program. Guidance provided in Accounting Standards Code 605-45, " Principal Agent Considerations," indicates whether revenue should be reported gross or net for this type of arrangement. Management assessed various principal versus agent indicators provided in the guidance and concluded that the Corporation bears the risks and rewards of providing the services for the card program based on the new contract terms and, therefore, gross presentation of revenues and expenses is appropriate. This change in presentation resulted in increases of $48 million and $136 million to both "card fees" in noninterest income and "outside processing fee expense" in noninterest expenses for the three- and nine-month periods ended September 30, 2015 , respectively.
Recently Adopted and Pending Accounting Pronouncements	Recently Adopted Accounting Pronouncements Effective January 1, 2015, the Corporation prospectively adopted Accounting Standards Update (ASU) No. 2014-04, “Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure,” (ASU 2014-04), which clarifies when an in-substance foreclosure or repossession of residential real estate property occurs, requiring a creditor to reclassify the loan to other real estate. According to ASU 2014-04, a consumer mortgage loan should be reclassified to other real estate either upon the creditor obtaining legal title to the real estate collateral or when the borrower voluntarily conveys all interest in the real estate property to the creditor through a deed in lieu of foreclosure or similar legal agreement. ASU 2014-04 also clarifies that a creditor that has obtained legal title to a foreclosed property should not delay reclassification when a borrower has a legal right of redemption for a period of time. The Corporation's existing accounting treatment is consistent with the new guidance, and therefore the adoption of ASU 2014-04 had no impact to the Corporation's financial condition and results of operations. Disclosures required by ASU 2014-04 are provided in Note 4. Also effective January 1, 2015, the Corporation prospectively adopted ASU No. 2014-12, “Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” (ASU 2014-12). The new guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The Corporation's current accounting treatment of performance conditions for employees who are or become retirement eligible prior to the achievement of the performance target is consistent with ASU 2014-12, and as such the adoption of ASU 2014-12 had no impact to the Corporation’s financial condition and results of operations. In the second quarter 2015, the Corporation early adopted ASU 2015-03, "Interest - Imputation of Interest (Subtopic 835-30)," which amends the presentation of debt issuance costs in the balance sheet as a direct deduction from the carrying amount of the related debt liability rather than as a deferred charge. The new guidance was retrospectively applied, which resulted in a decrease of $4 million to both "accrued income and other assets" and "medium- and long-term debt" on the consolidated balance sheets as of December 31, 2014 . Unamortized debt issuance costs deducted from the carrying amount of medium- and long-term debt totaled $9 million at September 30, 2015 . Pending Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous GAAP comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. The guidance under ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2017 and must be retrospectively applied. Entities will have the option of presenting prior periods as impacted by the new guidance or presenting the cumulative effect of initial application along with supplementary disclosures. Early adoption is permitted, but not before annual and interim periods beginning after December 15, 2016. The Corporation is currently evaluating the impact of adopting ASU 2014-09. In February 2015, the FASB issued ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis," (ASU 2015-02), which makes targeted amendments to the considerations applied by reporting entities when determining if a legal entity should be consolidated, including placing more emphasis on risk of loss when determining a controlling financial interest. Low-income housing tax credit investments that meet the criteria for the proportional amortization method are not impacted by these amendments. ASU 2015-02 is effective for annual and interim periods beginning after December 15, 2015, and must be retrospectively applied. Early adoption is permitted. The Corporation does not expect the adoption of ASU 2015-02 to have a material effect on its financial condition and results of operations. In April 2015, the FASB issued ASU 2015-05, "Goodwill and Other - Internal-Use Software (Subtopic 350-40)," (ASU 2015-05), which defines specific criteria entities must apply to determine if a cloud computing arrangement includes an in-substance software license. The result of the assessment will direct the entity to apply either software licensing or service contract guidance to record the related costs. ASU 2015-05 is effective for annual and interim periods beginning after December 15, 2015, and can be prospectively or retrospectively applied. Early adoption is permitted. The Corporation does not expect the adoption to have a material effect on its financial condition and results of operations. In May 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent),” (ASU 2015-07) which amends disclosure requirements for entities that utilize net asset value per share (or its equivalent) to measure fair value as a practical expedient. The update eliminates the requirement to classify these investments within the fair value hierarchy and instead requires disclosure of sufficient information about these investments to permit reconciliation of the fair value of investments categorized within the fair value hierarchy to the investments presented in the consolidated balance sheet. ASU 2015-07 is effective for annual and interim periods beginning after December 15, 2015 and must be applied retrospectively. Early adoption is permitted. The adoption of ASU 2015-07 will have no impact on the Corporation's financial condition or results of operations.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Assets And Liabilities Recorded At Fair Value On A Recurring Basis	The following tables present the recorded amount of assets and liabilities measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 . (in millions) Total Level 1 Level 2 Level 3 September 30, 2015 Trading securities: Deferred compensation plan assets $ 89 $ 89 $ — $ — Equity and other non-debt securities 3 3 — — State and municipal securities 1 — 1 — Total trading securities 93 92 1 — Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities 930 930 — — Residential mortgage-backed securities (a) 7,559 — 7,559 — State and municipal securities 9 — — 9 (b) Corporate debt securities 45 — 44 1 (b) Equity and other non-debt securities 206 137 — 69 (b) Total investment securities available-for-sale 8,749 1,067 7,603 79 Derivative assets: Interest rate contracts 375 — 364 11 Energy derivative contracts 459 — 459 — Foreign exchange contracts 51 — 51 — Warrants 3 — — 3 Total derivative assets 888 — 874 14 Total assets at fair value $ 9,730 $ 1,159 $ 8,478 $ 93 Derivative liabilities: Interest rate contracts $ 140 $ — $ 140 $ — Energy derivative contracts 456 — 456 — Foreign exchange contracts 44 — 44 — Other 1 — — 1 Total derivative liabilities 641 — 640 1 Deferred compensation plan liabilities 89 89 — — Total liabilities at fair value $ 730 $ 89 $ 640 $ 1 (a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (b) Auction-rate securities. (in millions) Total Level 1 Level 2 Level 3 December 31, 2014 Trading securities: Deferred compensation plan assets $ 94 $ 94 $ — $ — Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities 526 526 — — Residential mortgage-backed securities (a) 7,274 — 7,274 — State and municipal securities 23 — — 23 (b) Corporate debt securities 51 — 50 1 (b) Equity and other non-debt securities 242 130 — 112 (b) Total investment securities available-for-sale 8,116 656 7,324 136 Derivative assets: Interest rate contracts 328 — 328 — Energy derivative contracts 527 — 527 — Foreign exchange contracts 39 — 39 — Warrants 4 — — 4 Total derivative assets 898 — 894 4 Total assets at fair value $ 9,108 $ 750 $ 8,218 $ 140 Derivative liabilities: Interest rate contracts $ 102 $ — $ 102 $ — Energy derivative contracts 525 — 525 — Foreign exchange contracts 34 — 34 — Other 1 — — 1 Total derivative liabilities 662 — 661 1 Deferred compensation plan liabilities 94 94 — — Total liabilities at fair value $ 756 $ 94 $ 661 $ 1 (a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (b) Auction-rate securities.
Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis	The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three- and nine-month periods ended September 30, 2015 and 2014 . Net Realized/Unrealized Gains (Losses) (Pretax) Balance at Beginning of Period Recorded in Earnings Recorded in Other Comprehensive Income Balance at End of Period (in millions) Realized Unrealized Sales Three Months Ended September 30, 2015 Investment securities available-for-sale: State and municipal securities (a) $ 23 $ — $ — $ — $ (14 ) $ 9 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 71 — — (1 ) (b) (1 ) 69 Total investment securities available-for-sale 95 — — (1 ) (b) (15 ) 79 Derivative assets: Interest rate contracts 2 — 9 (d) — — 11 Warrants 3 5 (d) — — (5 ) 3 Derivative liabilities: Other 1 — — — — 1 Three Months Ended September 30, 2014 Investment securities available-for-sale: State and municipal securities (a) $ 23 $ — $ — $ — $ — $ 23 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 118 1 (c) — 1 (b) (7 ) 113 Total investment securities available-for-sale 142 1 (c) — 1 (b) (7 ) 137 Derivative assets: Warrants 4 2 (d) — — (2 ) 4 Derivative liabilities: Other 2 — (1 ) (c) — — 3 Nine Months Ended September 30, 2015 Investment securities available-for-sale: State and municipal securities (a) $ 23 $ — $ — $ — $ (14 ) $ 9 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 112 (2 ) (c) — — (41 ) 69 Total investment securities available-for-sale 136 (2 ) (c) — — (55 ) 79 Derivative assets: Interest rate contracts — — 11 (d) — — 11 Warrants 4 6 (d) (1 ) (d) — (6 ) 3 Derivative liabilities: Other 1 — — — — 1 Nine Months Ended September 30, 2014 Investment securities available-for-sale: State and municipal securities (a) $ 22 $ — $ — $ 1 (b) $ — $ 23 Corporate debt securities (a) 1 — — — — 1 Equity and other non-debt securities (a) 136 2 (c) — 7 (b) (32 ) 113 Total investment securities available-for-sale 159 2 (c) — 8 (b) (32 ) 137 Derivative assets: Warrants 3 6 (d) 1 (d) — (6 ) 4 Derivative liabilities: Other 2 — (1 ) (c) — — 3 (a) Auction-rate securities. (b) Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income. (c) Realized and unrealized gains and losses due to changes in fair value recorded in "net securities gains" on the consolidated statements of comprehensive income. (d) Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income.
Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis	The following table presents assets recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 . No liabilities were recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 . (in millions) Total Level 2 Level 3 September 30, 2015 Loans held-for-sale: Commercial $ 12 $ 12 $ — Loans: Commercial 124 — 124 Commercial mortgage 12 — 12 International 8 — 8 Total loans 144 — 144 Nonmarketable equity securities 1 — 1 Other real estate 3 — 3 Total assets at fair value $ 160 $ 12 $ 148 December 31, 2014 Loans: Commercial 38 — $ 38 Commercial mortgage 26 — 26 Total loans 64 — 64 Nonmarketable equity securities 2 — 2 Other real estate 2 — 2 Total assets at fair value $ 68 $ — $ 68
Quantitative Information About Level 3 Measurements	The following table presents quantitative information related to the significant unobservable inputs utilized in the Corporation's Level 3 recurring fair value measurement as of September 30, 2015 and December 31, 2014 . The Corporation's Level 3 recurring fair value measurements include auction-rate securities where fair value is determined using an income approach based on a discounted cash flow model. The inputs in the table below reflect management's expectation of continued illiquidity in the secondary auction-rate securities market due to a lack of market activity for the issuers remaining in the portfolio, a lack of market incentives for issuer redemptions, and the expectation for a continuing low interest rate environment. The September 30, 2015 workout periods reflect management's view that short-term interest rates could begin to rise in 2015. Discounted Cash Flow Model Unobservable Input Fair Value (in millions) Discount Rate Workout Period (in years) September 30, 2015 State and municipal securities (a) $ 9 3% - 10% 1 - 3 Equity and other non-debt securities (a) 69 4% - 9% 1 - 2 December 31, 2014 State and municipal securities (a) $ 23 3% - 9% 1 - 3 Equity and other non-debt securities (a) 112 4% - 8% 1 - 2 (a) Auction-rate securities.
Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value In Their Entirety On A Recurring Basis	The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis on the Corporation’s consolidated balance sheets are as follows: Carrying Amount Estimated Fair Value (in millions) Total Level 1 Level 2 Level 3 September 30, 2015 Assets Cash and due from banks $ 1,101 $ 1,101 $ 1,101 $ — $ — Interest-bearing deposits with banks 6,099 6,099 6,099 — — Investment securities held-to-maturity 1,863 1,872 — 1,872 — Loans held-for-sale (a) 15 15 — 15 — Total loans, net of allowance for loan losses (b) 48,320 48,244 — — 48,244 Customers’ liability on acceptances outstanding 5 5 5 — — Nonmarketable equity securities (c) 10 19 — — 19 Restricted equity investments 92 92 92 — — Liabilities Demand deposits (noninterest-bearing) 28,697 28,697 — 28,697 — Interest-bearing deposits 25,945 25,945 — 25,945 — Customer certificates of deposit 4,126 4,119 — 4,119 — Total deposits 58,768 58,761 — 58,761 — Short-term borrowings 109 109 109 — — Acceptances outstanding 5 5 5 — — Medium- and long-term debt 3,100 3,047 — 3,047 — Credit-related financial instruments (89 ) (89 ) — — (89 ) December 31, 2014 Assets Cash and due from banks $ 1,026 $ 1,026 $ 1,026 $ — $ — Interest-bearing deposits with banks 5,045 5,045 5,045 — — Investment securities held-to-maturity 1,935 1,933 — 1,933 — Loans held-for-sale (a) 5 5 — 5 — Total loans, net of allowance for loan losses (b) 47,999 47,932 — — 47,932 Customers’ liability on acceptances outstanding 10 10 10 — — Nonmarketable equity securities (c) 11 18 — — 18 Restricted equity investments 92 92 92 — — Liabilities Demand deposits (noninterest-bearing) 27,224 27,224 — 27,224 — Interest-bearing deposits 25,841 25,841 — 25,841 — Customer certificates of deposit 4,421 4,411 — 4,411 — Total deposits 57,486 57,476 — 57,476 — Short-term borrowings 116 116 116 — — Acceptances outstanding 10 10 10 — — Medium- and long-term debt 2,675 2,681 — 2,681 — Credit-related financial instruments (85 ) (85 ) — — (85 ) (a) Included $12 million and no impaired loans held-for-sale recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 , respectively. (b) Included $144 million and $64 million of impaired loans recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 , respectively. (c) Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014 , respectively.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Summary Of Investment Securities	A summary of the Corporation’s investment securities follows: (in millions) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value September 30, 2015 Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities $ 917 $ 13 $ — $ 930 Residential mortgage-backed securities (a) 7,445 133 19 7,559 State and municipal securities 9 — — 9 Corporate debt securities 45 — — 45 Equity and other non-debt securities 206 1 1 206 Total investment securities available-for-sale (b) $ 8,622 $ 147 $ 20 $ 8,749 Investment securities held-to-maturity (c): Residential mortgage-backed securities (a) $ 1,863 $ 10 $ 1 $ 1,872 December 31, 2014 Investment securities available-for-sale: U.S. Treasury and other U.S. government agency securities $ 526 $ — $ — $ 526 Residential mortgage-backed securities (a) 7,192 122 40 7,274 State and municipal securities 24 — 1 23 Corporate debt securities 51 — — 51 Equity and other non-debt securities 242 1 1 242 Total investment securities available-for-sale (b) $ 8,035 $ 123 $ 42 $ 8,116 Investment securities held-to-maturity (c): Residential mortgage-backed securities (a) $ 1,935 $ — $ 2 $ 1,933 (a) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (b) Included auction-rate securities at amortized cost and fair value of $80 million and $79 million , respectively as of September 30, 2015 and $137 million and $136 million , respectively, as of December 31, 2014 . (c) The amortized cost of investment securities held-to-maturity included net unrealized losses of $17 million at September 30, 2015 and $23 million at December 31, 2014 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 September 30, 2015 and December 31, 2014 follows: Temporarily Impaired Less than 12 Months 12 Months or more Total (in millions) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2015 Residential mortgage-backed securities (b) $ 642 $ 3 $ 2,071 $ 37 $ 2,713 $ 40 State and municipal securities (c) — — 9 — (a) 9 — (a) Corporate debt securities (c) — — 1 — (a) 1 — (a) Equity and other non-debt securities (c) 70 1 — — 70 1 Total temporarily impaired securities $ 712 $ 4 $ 2,081 $ 37 $ 2,793 $ 41 December 31, 2014 U.S. Treasury and other U.S. government agency securities $ 298 $ — (a) $ — $ — $ 298 $ — (a) Residential mortgage-backed securities (b) 626 3 3,112 71 3,738 74 State and municipal securities (c) — — 22 1 22 1 Corporate debt securities (c) — — 1 — (a) 1 — (a) Equity and other non-debt securities (c) — — 112 1 112 1 Total temporarily impaired securities $ 924 $ 3 $ 3,247 $ 73 $ 4,171 $ 76 (a) Unrealized losses less than $0.5 million. (b) Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (c) Auction-rate securities.
Summary of Net Securities Gains (Losses)	Sales, calls and write-downs of investment securities available-for-sale resulted in the following gains and losses recorded in “net securities losses” on the consolidated statements of comprehensive income, computed based on the adjusted cost of the specific security. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Securities gains $ — $ — $ — $ 1 Securities losses — (1 ) (2 ) (1 ) Net securities losses $ — $ (1 ) $ (2 ) $ —
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 September 30, 2015 Amortized Cost Fair Value Amortized Cost Fair Value Contractual maturity Within one year $ 74 $ 74 $ — $ — After one year through five years 1,123 1,136 — — After five years through ten years 929 976 — — After ten years 6,290 6,357 1,863 1,872 Subtotal 8,416 8,543 1,863 1,872 Equity and other non-debt securities 206 206 Total investment securities $ 8,622 $ 8,749 $ 1,863 $ 1,872

Credit Quality And Allowance 24

Credit Quality And Allowance For Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2015
Credit Quality And Allowance For Credit Losses [Abstract]
Aging Analysis Of Loans	The following table presents an aging analysis of the recorded balance of loans. Loans Past Due and Still Accruing (in millions) 30-59 Days 60-89 Days 90 Days or More Total Nonaccrual Loans Current Loans Total Loans September 30, 2015 Business loans: Commercial $ 83 $ 8 $ 2 $ 93 $ 214 $ 31,470 $ 31,777 Real estate construction: Commercial Real Estate business line (a) 4 — — 4 — 1,558 1,562 Other business lines (b) 1 — — 1 1 310 312 Total real estate construction 5 — — 5 1 1,868 1,874 Commercial mortgage: Commercial Real Estate business line (a) 21 — — 21 17 1,964 2,002 Other business lines (b) 13 3 2 18 49 6,718 6,785 Total commercial mortgage 34 3 2 39 66 8,682 8,787 Lease financing — — — — 8 743 751 International 3 — 1 4 8 1,370 1,382 Total business loans 125 11 5 141 297 44,133 44,571 Retail loans: Residential mortgage 12 1 — 13 31 1,836 1,880 Consumer: Home equity 5 1 — 6 28 1,680 1,714 Other consumer 2 — — 2 1 774 777 Total consumer 7 1 — 8 29 2,454 2,491 Total retail loans 19 2 — 21 60 4,290 4,371 Total loans $ 144 $ 13 $ 5 $ 162 $ 357 $ 48,423 $ 48,942 December 31, 2014 Business loans: Commercial $ 58 $ 13 $ 1 $ 72 $ 109 $ 31,339 $ 31,520 Real estate construction: Commercial Real Estate business line (a) 3 — — 3 1 1,602 1,606 Other business lines (b) 12 — — 12 1 336 349 Total real estate construction 15 — — 15 2 1,938 1,955 Commercial mortgage: Commercial Real Estate business line (a) 8 1 1 10 22 1,758 1,790 Other business lines (b) 16 12 2 30 73 6,711 6,814 Total commercial mortgage 24 13 3 40 95 8,469 8,604 Lease financing — — — — — 805 805 International 9 — — 9 — 1,487 1,496 Total business loans 106 26 4 136 206 44,038 44,380 Retail loans: Residential mortgage 9 2 — 11 36 1,784 1,831 Consumer: Home equity 5 3 — 8 30 1,620 1,658 Other consumer 12 — 1 13 1 710 724 Total consumer 17 3 1 21 31 2,330 2,382 Total retail loans 26 5 1 32 67 4,114 4,213 Total loans $ 132 $ 31 $ 5 $ 168 $ 273 $ 48,152 $ 48,593 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate.
Loans By Credit Quality Indicator	The following table presents loans by credit quality indicator, based on internal risk ratings assigned to each business loan at the time of approval and subjected to subsequent reviews, generally at least annually, and to pools of retail loans with similar risk characteristics. Internally Assigned Rating (in millions) Pass (a) Special Mention (b) Substandard (c) Nonaccrual (d) Total September 30, 2015 Business loans: Commercial $ 29,571 $ 1,035 $ 957 $ 214 $ 31,777 Real estate construction: Commercial Real Estate business line (e) 1,554 — 8 — 1,562 Other business lines (f) 303 — 8 1 312 Total real estate construction 1,857 — 16 1 1,874 Commercial mortgage: Commercial Real Estate business line (e) 1,920 33 32 17 2,002 Other business lines (f) 6,441 160 135 49 6,785 Total commercial mortgage 8,361 193 167 66 8,787 Lease financing 719 16 8 8 751 International 1,281 69 24 8 1,382 Total business loans 41,789 1,313 1,172 297 44,571 Retail loans: Residential mortgage 1,816 1 32 31 1,880 Consumer: Home equity 1,682 1 3 28 1,714 Other consumer 757 9 10 1 777 Total consumer 2,439 10 13 29 2,491 Total retail loans 4,255 11 45 60 4,371 Total loans $ 46,044 $ 1,324 $ 1,217 $ 357 $ 48,942 December 31, 2014 Business loans: Commercial $ 30,310 $ 560 $ 541 $ 109 $ 31,520 Real estate construction: Commercial Real Estate business line (e) 1,594 11 — 1 1,606 Other business lines (f) 336 7 5 1 349 Total real estate construction 1,930 18 5 2 1,955 Commercial mortgage: Commercial Real Estate business line (e) 1,652 69 47 22 1,790 Other business lines (f) 6,434 138 169 73 6,814 Total commercial mortgage 8,086 207 216 95 8,604 Lease financing 778 26 1 — 805 International 1,468 15 13 — 1,496 Total business loans 42,572 826 776 206 44,380 Retail loans: Residential mortgage 1,790 2 3 36 1,831 Consumer: Home equity 1,620 — 8 30 1,658 Other consumer 718 3 2 1 724 Total consumer 2,338 3 10 31 2,382 Total retail loans 4,128 5 13 67 4,213 Total loans $ 46,700 $ 831 $ 789 $ 273 $ 48,593 (a) Includes all loans not included in the categories of special mention, substandard or nonaccrual. (b) Special mention loans are accruing loans that have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date. (c) Substandard loans are accruing loans that have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans also are distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. This category is generally consistent with the "substandard" category as defined by regulatory authorities. (d) Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-55 in the Corporation's 2014 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities. (e) Primarily loans to real estate developers. (f) Primarily loans secured by owner-occupied real estate.
Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property	The following table summarizes nonperforming assets. (in millions) September 30, 2015 December 31, 2014 Nonaccrual loans $ 357 $ 273 Reduced-rate loans (a) 12 17 Total nonperforming loans 369 290 Foreclosed property (b) 12 10 Total nonperforming assets $ 381 $ 300 (a) Reduced-rate business loans were zero at both September 30, 2015 and December 31, 2014 , and reduced-rate retail loans were $12 million and $17 million at September 30, 2015 and December 31, 2014 , respectively. (b) Foreclosed residential real estate properties.
Changes In The Allowance For Loan Losses And Related Loan Amounts	The following table details the changes in the allowance for loan losses and related loan amounts. 2015 2014 (in millions) Business Loans Retail Loans Total Business Loans Retail Loans Total Three Months Ended September 30 Allowance for loan losses: Balance at beginning of period $ 563 $ 55 $ 618 $ 528 $ 63 $ 591 Loan charge-offs (31 ) (3 ) (34 ) (20 ) (4 ) (24 ) Recoveries on loans previously charged-off 10 1 11 19 2 21 Net loan charge-offs (21 ) (2 ) (23 ) (1 ) (2 ) (3 ) Provision for loan losses 25 3 28 2 2 4 Foreign currency translation adjustment (1 ) — (1 ) — — — Balance at end of period $ 566 $ 56 $ 622 $ 529 $ 63 $ 592 Nine Months Ended September 30 Allowance for loan losses: Balance at beginning of period $ 534 $ 60 $ 594 $ 531 $ 67 $ 598 Loan charge-offs (83 ) (9 ) (92 ) (71 ) (11 ) (82 ) Recoveries on loans previously charged-off 38 5 43 50 8 58 Net loan charge-offs (45 ) (4 ) (49 ) (21 ) (3 ) (24 ) Provision for loan losses 79 — 79 19 (1 ) 18 Foreign currency translation adjustment (2 ) — (2 ) — — — Balance at end of period $ 566 $ 56 $ 622 $ 529 $ 63 $ 592 As a percentage of total loans 1.27 % 1.29 % 1.27 % 1.21 % 1.52 % 1.24 % September 30 Allowance for loan losses: Individually evaluated for impairment $ 47 $ — $ 47 $ 40 $ — $ 40 Collectively evaluated for impairment 519 56 575 489 63 552 Total allowance for loan losses $ 566 $ 56 $ 622 $ 529 $ 63 $ 592 Loans: Individually evaluated for impairment $ 338 $ 51 $ 389 $ 204 $ 44 $ 248 Collectively evaluated for impairment 44,233 4,318 48,551 43,384 4,073 47,457 Purchased credit impaired (PCI) loans — 2 2 — 3 3 Total loans evaluated for impairment $ 44,571 $ 4,371 $ 48,942 $ 43,588 $ 4,120 $ 47,708
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 September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Balance at beginning of period $ 50 $ 42 $ 41 $ 36 Charge-offs on lending related commitments (a) — — (1 ) — Provision for credit losses on lending-related commitments (2 ) 1 8 7 Balance at end of period $ 48 $ 43 $ 48 $ 43 (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 September 30, 2015 Business loans: Commercial $ 60 $ 216 $ 276 $ 327 $ 37 Real estate construction: Other business lines (a) — 1 1 1 — Commercial mortgage: Commercial Real Estate business line (b) 7 8 15 38 2 Other business lines (a) 6 30 36 52 5 Total commercial mortgage 13 38 51 90 7 International — 10 10 17 3 Total business loans 73 265 338 435 47 Retail loans: Residential mortgage 31 — 31 32 — Consumer: Home equity 12 — 12 16 — Other consumer 8 — 8 11 — Total consumer 20 — 20 27 — Total retail loans (c) 51 — 51 59 — Total individually evaluated impaired loans $ 124 $ 265 $ 389 $ 494 $ 47 December 31, 2014 Business loans: Commercial $ 7 $ 103 $ 110 $ 148 $ 29 Real estate construction: Other business lines (a) — 1 1 1 — Commercial mortgage: Commercial Real Estate business line (b) — 19 19 41 8 Other business lines (a) 4 43 47 63 2 Total commercial mortgage 4 62 66 104 10 Total business loans 11 166 177 253 39 Retail loans: Residential mortgage 25 — 25 28 — Consumer: Home equity 12 — 12 16 — Other consumer 5 — 5 7 — Total consumer 17 — 17 23 — Total retail loans (c) 42 — 42 51 — Total individually evaluated impaired loans $ 53 $ 166 $ 219 $ 304 $ 39 (a) Primarily loans secured by owner-occupied real estate. (b) Primarily loans to real estate developers. (c) Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy changes which resulted in direct write-downs of restructured retail loans.
Average Individually Evaluated Impaired Loans And Related Interest Recognized	The following table presents information regarding average individually evaluated impaired loans and the related interest recognized. Interest income recognized for the period primarily related to performing restructured loans. Individually Evaluated Impaired Loans 2015 2014 (in millions) Average Balance for the Period Interest Income Recognized for the Period Average Balance for the Period Interest Income Recognized for the Period Three Months Ended September 30 Business loans: Commercial $ 236 $ 1 $ 74 $ 1 Real estate construction: Commercial Real Estate business line (a) — — 16 — Commercial mortgage: Commercial Real Estate business line (a) 15 — 49 — Other business lines (b) 37 1 70 — Total commercial mortgage 52 1 119 — International 10 — 1 — Total business loans 298 2 210 1 Retail loans: Residential mortgage 23 — 29 — Consumer loans: Home equity 12 — 11 — Other consumer 7 — 4 — Total consumer 19 — 15 — Total retail loans 42 — 44 — Total individually evaluated impaired loans $ 340 $ 2 $ 254 $ 1 Nine Months Ended September 30 Business loans: Commercial $ 172 $ 3 $ 68 $ 1 Real estate construction: Commercial Real Estate business line (a) — — 17 — Other business lines (b) — — 1 — Total real estate construction — — 18 — Commercial mortgage: Commercial Real Estate business line (a) 17 — 56 — Other business lines (b) 41 1 68 2 Total commercial mortgage 58 1 124 2 International 5 — 2 — Total business loans 235 4 212 3 Retail loans: Residential mortgage 23 — 31 — Consumer: Home equity 12 — 12 — Other consumer 6 — 4 — Total consumer 18 — 16 — Total retail loans 41 — 47 — Total individually evaluated impaired loans $ 276 $ 4 $ 259 $ 3 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate.
Troubled Debt Restructurings By Type Of Modification	The following tables detail the recorded balance at September 30, 2015 and 2014 of loans considered to be TDRs that were restructured during the three- and nine-month periods ended September 30, 2015 and 2014 , by type of modification. In cases of loans with more than one type of modification, the loans were categorized based on the most significant modification. 2015 2014 Type of Modification Type of Modification (in millions) Principal Deferrals (a) Interest Rate Reductions Total Modifications Principal Deferrals (a) Interest Rate Reductions Total Modifications Three Months Ended September 30 Business loans: Commercial $ 100 $ — $ 100 $ 2 $ — $ 2 Commercial mortgage: Commercial Real Estate business line (b) 7 — 7 — — — Other business lines (c) 3 — 3 6 — 6 Total commercial mortgage 10 — 10 6 — 6 International 2 — 2 — — — Total business loans 112 — 112 8 — 8 Retail loans: Residential mortgage 18 — 18 — — — Consumer: Home equity 1 1 2 1 — 1 Total retail loans 19 1 20 1 — 1 Total loans $ 131 $ 1 $ 132 $ 9 $ — $ 9 Nine Months Ended September 30 Business loans: Commercial $ 102 $ — $ 102 $ 3 $ — $ 3 Commercial mortgage: Commercial Real Estate business line (b) 9 — 9 — — — Other business lines (c) 7 — 7 10 — 10 Total commercial mortgage 16 — 16 10 — 10 International 2 — 2 1 — 1 Total business loans 120 — 120 14 — 14 Retail loans: Residential mortgage 18 — 18 — — — Consumer: Home equity 1 1 2 1 2 3 Total retail loans 19 1 20 1 2 3 Total loans $ 139 $ 1 $ 140 $ 15 $ 2 $ 17 (a) Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates. (b) Primarily loans to real estate developers. (c) Primarily loans secured by owner-occupied real estate.
Troubled Debt Restructuring Subsequent Default	The following table presents information regarding the recorded balance at September 30, 2015 and 2014 of loans modified by principal deferral during the twelve-month periods ended September 30, 2015 and 2014 , and those principal deferrals which experienced a subsequent default during the three- and nine-month periods ended September 30, 2015 and 2014 . For principal deferrals, incremental deterioration in the credit quality of the loan, represented by a downgrade in the risk rating of the loan, for example, due to missed interest payments or a reduction of collateral value, is considered a subsequent default. 2015 2014 (in millions) Balance at September 30 Subsequent Default in the Three Months Ended September 30 Subsequent Default in the Nine Months Ended September 30 Balance at September 30 Subsequent Default in the Three Months Ended September 30 Subsequent Default in the Nine Months Ended September 30 Principal deferrals: Business loans: Commercial $ 108 $ 1 $ 3 $ 13 $ 6 $ 9 Commercial mortgage: Commercial Real Estate business line (a) 9 — — 4 — — Other business lines (b) 7 — 1 10 4 4 Total commercial mortgage 16 — 1 14 4 4 International 2 — — 1 — — Total business loans 126 1 4 28 10 13 Retail loans: Residential mortgage 18 (c) — — 2 (c) — — Consumer: Home equity 1 (c) — — 2 (c) — — Total retail loans 19 — — 4 — — Total principal deferrals $ 145 $ 1 $ 4 $ 32 $ 10 $ 13 (a) Primarily loans to real estate developers. (b) Primarily loans secured by owner-occupied real estate. (c) Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.
Acquired Purchased Credit-Impaired Loans	The carrying amount of acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at September 30, 2015 and December 31, 2014 were as follows. (in millions) September 30, 2015 December 31, 2014 Acquired PCI loans: Carrying amount $ 2 $ 2 Outstanding balance (principal and unpaid interest) 6 8
Accretable Yield For Acquired Purchased Credit-Impaired Loans	Changes in the accretable yield for acquired PCI loans for the three- and nine-month periods ended September 30, 2015 and 2014 were as follows. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Balance at beginning of period $ 1 $ 6 $ 1 $ 15 Reclassifications from nonaccretable 1 1 2 10 Accretion (1 ) (1 ) (2 ) (19 ) Balance at end of period $ 1 $ 6 $ 1 $ 6

Derivative And Credit-Related25

Derivative And Credit-Related Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of Derivative Instruments	The following table presents the composition of the Corporation’s derivative instruments held or issued for risk management purposes or in connection with customer-initiated and other activities at September 30, 2015 and December 31, 2014 . The table excludes commitments, warrants accounted for as derivatives and a derivative related to the Corporation’s 2008 sale of its remaining ownership of Visa shares. September 30, 2015 December 31, 2014 Fair Value Fair Value (in millions) Notional/ Contract Amount (a) Gross Derivative Assets Gross Derivative Liabilities Notional/ Contract Amount (a) Gross Derivative Assets Gross Derivative Liabilities Risk management purposes Derivatives designated as hedging instruments Interest rate contracts: Swaps - fair value - receive fixed/pay floating $ 2,525 $ 186 $ — $ 1,800 $ 175 $ — Derivatives used as economic hedges Foreign exchange contracts: Spot, forwards and swaps 632 1 1 508 4 — Total risk management purposes 3,157 187 1 2,308 179 — Customer-initiated and other activities Interest rate contracts: Caps and floors written 270 — — 274 — — Caps and floors purchased 270 — — 274 — — Swaps 12,073 189 140 11,780 153 102 Total interest rate contracts 12,613 189 140 12,328 153 102 Energy contracts: Caps and floors written 714 — 101 1,218 — 173 Caps and floors purchased 714 101 — 1,218 173 — Swaps 2,130 358 355 2,496 354 352 Total energy contracts 3,558 459 456 4,932 527 525 Foreign exchange contracts: Spot, forwards, options and swaps 2,028 50 43 1,994 35 34 Total customer-initiated and other activities 18,199 698 639 19,254 715 661 Total gross derivatives $ 21,356 885 640 $ 21,562 894 661 Amounts offset in the consolidated balance sheets: Netting adjustment - Offsetting derivative assets/liabilities (123 ) (123 ) (133 ) (133 ) Netting adjustment - Cash collateral received/posted (282 ) (6 ) (262 ) — Net derivatives included in the consolidated balance sheets (b) 480 511 499 528 Amounts not offset in the consolidated balance sheets: Marketable securities pledged under bilateral collateral agreements (141 ) (12 ) (239 ) (2 ) Net derivatives after deducting amounts not offset in the consolidated balance sheets $ 339 $ 499 $ 260 $ 526 (a) Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets. (b) Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $5 million and $2 million at September 30, 2015 and December 31, 2014 , respectively.
Schedule Of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps	The following table summarizes the expected weighted average remaining maturity of the notional amount of risk management interest rate swaps and the weighted average interest rates associated with amounts expected to be received or paid on interest rate swap agreements as of September 30, 2015 and December 31, 2014 . Weighted Average (dollar amounts in millions) Notional Amount Remaining Maturity (in years) Receive Rate Pay Rate (a) September 30, 2015 Swaps - fair value - receive fixed/pay floating rate Medium- and long-term debt designation $ 2,525 5.3 3.89 % 1.00 % December 31, 2014 Swaps - fair value - receive fixed/pay floating rate Medium- and long-term debt designation 1,800 4.6 4.54 0.49 (a) Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at September 30, 2015 and December 31, 2014 .
Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives	The net gains recognized in income on customer-initiated derivative instruments, net of the impact of offsetting positions, were as follows . Three Months Ended September 30, Nine Months Ended September 30, (in millions) Location of Gain 2015 2014 2015 2014 Interest rate contracts Other noninterest income $ 4 $ 3 $ 11 $ 11 Energy contracts Other noninterest income 1 1 2 1 Foreign exchange contracts Foreign exchange income 9 9 27 29 Total $ 14 $ 13 $ 40 $ 41
Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk	The Corporation’s credit risk associated with these instruments is represented by the contractual amounts indicated in the following table. (in millions) September 30, 2015 December 31, 2014 Unused commitments to extend credit: Commercial and other $ 26,887 $ 27,905 Bankcard, revolving check credit and home equity loan commitments 2,376 2,151 Total unused commitments to extend credit $ 29,263 $ 30,056 Standby letters of credit $ 3,993 $ 3,880 Commercial letters of credit 59 75 Other credit-related financial instruments 1 1
Summary Of Criticized Letters Of Credit	The following table presents a summary of criticized standby and commercial letters of credit at September 30, 2015 and December 31, 2014 . The Corporation's criticized list is generally consistent with the Special mention, Substandard and Doubtful categories defined by regulatory authorities. The Corporation manages credit risk through underwriting, periodically reviewing and approving its credit exposures using Board committee approved credit policies and guidelines. (dollar amounts in millions) September 30, 2015 December 31, 2014 Total criticized standby and commercial letters of credit $ 104 $ 79 As a percentage of total outstanding standby and commercial letters of credit 2.6 % 2.0 %

Variable Interest Entities (V26

Variable Interest Entities (VIEs) (Tables)	9 Months Ended
	Sep. 30, 2015
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Impact Of VIEs On The Consolidated Statements Of Comprehensive Income	The following table summarizes the impact of these tax credit entities on line items on the Corporation’s consolidated statements of comprehensive income. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Other noninterest income: Amortization of other tax credit investments $ — $ (2 ) $ 1 $ (5 ) Provision for income taxes: Amortization of LIHTC investments 15 15 45 43 Low income housing tax credits (15 ) (15 ) (45 ) (43 ) Other tax benefits related to tax credit entities (5 ) (6 ) (15 ) (19 ) Total provision for income taxes $ (5 ) $ (6 ) (15 ) (19 )

Medium- And Long-Term Debt (Tab

Medium- And Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Schedule Of Medium- And Long-Term Debt	Medium- and long-term debt is summarized as follows: (in millions) September 30, 2015 December 31, 2014 Parent company Subordinated notes: 4.80% subordinated notes due 2015 (a) $ — $ 304 3.80% subordinated notes due 2026 (a) 264 257 Medium-term notes: 3.00% notes due 2015 — 300 2.125% notes due 2019 (a) 354 347 Total parent company 618 1,208 Subsidiaries Subordinated notes: 5.75% subordinated notes due 2016 (a) (b) 662 670 5.20% subordinated notes due 2017 (a) 538 548 4.00% subordinated notes due 2025 (a) 358 — 7.875% subordinated notes due 2026 (a) 228 227 Total subordinated notes 1,786 1,445 Medium-term notes: 2.50% notes due 2020 (a) 680 — Other notes: 6.0% - 6.4% fixed-rate notes due 2020 16 22 Total subsidiaries 2,482 1,467 Total medium- and long-term debt $ 3,100 $ 2,675 (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. The remaining amount is not swapped.

Accumulated Other Comprehensi28

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Loss	The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the nine months ended September 30, 2015 and 2014 , including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss). Nine Months Ended September 30, (in millions) 2015 2014 Accumulated net unrealized gains (losses) on investment securities: Balance at beginning of period, net of tax $ 37 $ (68 ) Net unrealized holding gains arising during the period 44 85 Less: Provision for income taxes 16 30 Net unrealized holding gains arising during the period, net of tax 28 55 Less: Net realized (losses) gains included in net securities (losses) gains (2 ) 1 Less: Benefit for income taxes (1 ) — Reclassification adjustment for net securities (losses) gains included in net income, net of tax (1 ) 1 Less: Net losses realized as a yield adjustment in interest on investment securities (6 ) — Less: Benefit for income taxes (2 ) — Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax (4 ) — Change in net unrealized gains (losses) on investment securities, net of tax 33 54 Balance at end of period, net of tax $ 70 $ (14 ) Accumulated defined benefit pension and other postretirement plans adjustment: Balance at beginning of period, net of tax $ (449 ) $ (323 ) Amortization of actuarial net loss 53 30 Amortization of prior service cost — 1 Amounts recognized in salaries and benefits expense 53 31 Less: Provision for income taxes 19 11 Change in defined benefit pension and other postretirement plans adjustment, net of tax 34 20 Balance at end of period, net of tax $ (415 ) $ (303 ) Total accumulated other comprehensive loss at end of period, net of tax $ (345 ) $ (317 )

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Basic And Diluted Net Income Per Common Share	Basic and diluted net income per common share are presented in the following table. Three Months Ended September 30, Nine Months Ended September 30, (in millions, except per share data) 2015 2014 2015 2014 Basic and diluted Net income $ 136 $ 154 $ 405 $ 444 Less: Income allocated to participating securities 2 2 5 6 Net income attributable to common shares $ 134 $ 152 $ 400 $ 438 Basic average common shares 176 179 176 179 Basic net income per common share $ 0.76 $ 0.85 $ 2.27 $ 2.44 Basic average common shares 176 179 176 179 Dilutive common stock equivalents: Net effect of the assumed exercise of stock options 2 2 2 2 Net effect of the assumed exercise of warrants 3 4 4 5 Diluted average common shares 181 185 182 186 Diluted net income per common share $ 0.74 $ 0.82 $ 2.20 $ 2.35
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 September 30, Nine Months Ended September 30, (shares in millions) 2015 2014 2015 2014 Average outstanding options 4.6 6.0 5.4 7.3 Range of exercise prices $46.68 - $60.82 $50.87 - $60.82 $46.68 - $60.82 $48.17 - $61.94

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Components of Net Periodic Benefit Cost	The components of net periodic benefit cost for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows. Qualified Defined Benefit Pension Plan Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Service cost $ 9 $ 7 $ 27 $ 22 Interest cost 22 22 66 66 Expected return on plan assets (40 ) (33 ) (120 ) (99 ) Amortization of prior service cost 1 1 3 4 Amortization of net loss 15 9 44 24 Net periodic defined benefit cost $ 7 $ 6 $ 20 $ 17 Non-Qualified Defined Benefit Pension Plan Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Service cost $ 1 $ 1 $ 3 $ 3 Interest cost 2 2 7 7 Amortization of prior service credit (1 ) (1 ) (3 ) (3 ) Amortization of net loss 3 2 8 5 Net periodic defined benefit cost $ 5 $ 4 $ 15 $ 12 Postretirement Benefit Plan Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2015 2014 2015 2014 Interest cost $ 1 $ — $ 2 $ 2 Expected return on plan assets (1 ) (1 ) (3 ) (3 ) Amortization of net loss — 1 1 1 Net periodic postretirement benefit cost $ — $ — $ — $ —

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 2015
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 September 30, 2015 Earnings summary: Net interest income (expense) (FTE) $ 380 $ 158 $ 45 $ (162 ) $ 2 $ 423 Provision for credit losses 30 2 (3 ) — (3 ) 26 Noninterest income 145 49 59 15 (4 ) 264 Noninterest expenses 202 185 74 2 (2 ) 461 Provision (benefit) for income taxes (FTE) 99 7 12 (56 ) 2 64 Net income (loss) $ 194 $ 13 $ 21 $ (93 ) $ 1 $ 136 Net loan charge-offs (recoveries) $ 23 $ 1 $ (1 ) $ — $ — $ 23 Selected average balances: Assets $ 39,210 $ 6,518 $ 5,228 $ 12,177 $ 8,200 $ 71,333 Loans 38,113 5,835 5,024 — — 48,972 Deposits 31,397 23,079 4,188 212 264 59,140 Statistical data: Return on average assets (a) 1.98 % 0.23 % 1.62 % N/M N/M 0.76 % Efficiency ratio (b) 38.41 89.33 71.11 N/M N/M 67.08 (dollar amounts in millions) Business Retail Wealth Management Finance Other Total Three Months Ended September 30, 2014 Earnings summary: Net interest income (expense) (FTE) $ 376 $ 153 $ 45 $ (166 ) $ 7 $ 415 Provision for credit losses (4 ) — 7 — 2 5 Noninterest income 97 42 59 15 2 215 Noninterest expenses 152 185 78 (29 ) 11 397 Provision (benefit) for income taxes (FTE) 114 3 7 (49 ) (1 ) 74 Net income (loss) $ 211 $ 7 $ 12 $ (73 ) $ (3 ) $ 154 Net loan charge-offs (recoveries) $ (2 ) $ — $ 5 $ — $ — $ 3 Selected average balances: Assets $ 37,751 $ 6,273 $ 4,998 $ 11,023 $ 6,353 $ 66,398 Loans 36,746 5,605 4,808 — — 47,159 Deposits 28,815 22,042 3,924 128 254 55,163 Statistical data: Return on average assets (a) 2.24 % 0.12 % 0.98 % N/M N/M 0.93 % Efficiency ratio b) 32.12 94.64 75.00 N/M N/M 62.87 (a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity. (b) Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains. FTE – Fully Taxable Equivalent N/M – not meaningful (dollar amounts in millions) Business Bank Retail Bank Wealth Management Finance Other Total Nine Months Ended September 30, 2015 Earnings summary: Net interest income (expense) (FTE) $ 1,123 $ 466 $ 133 $ (470 ) $ 7 $ 1,259 Provision for credit losses 115 (14 ) (12 ) — (2 ) 87 Noninterest income 427 137 177 42 (3 ) 780 Noninterest expenses 578 542 225 7 4 1,356 Provision (benefit) for income taxes (FTE) 292 26 34 (162 ) 1 191 Net income (loss) $ 565 $ 49 $ 63 $ (273 ) $ 1 $ 405 Net loan charge-offs (recoveries) $ 54 $ 3 $ (8 ) $ — $ — $ 49 Selected average balances: Assets $ 39,002 $ 6,449 $ 5,137 $ 12,013 $ 7,087 $ 69,688 Loans 37,950 5,767 4,938 — — 48,655 Deposits 30,594 22,746 4,082 159 270 57,851 Statistical data: Return on average assets (a) 1.93 % 0.28 % 1.64 % N/M N/M 0.78 % Efficiency ratio (b) 37.27 89.91 71.97 N/M N/M 66.41 (dollar amounts in millions) Business Bank Retail Bank Wealth Management Finance Other Total Nine Months Ended September 30, 2014 Earnings summary: Net interest income (expense) (FTE) $ 1,120 $ 454 $ 135 $ (485 ) $ 19 $ 1,243 Provision for credit losses 48 (5 ) (11 ) — (7 ) 25 Noninterest income 288 124 181 44 6 643 Noninterest expenses 440 533 231 (24 ) 27 1,207 Provision (benefit) for income taxes (FTE) 314 17 34 (160 ) 5 210 Net income (loss) $ 606 $ 33 $ 62 $ (257 ) $ — $ 444 Net loan charge-offs $ 18 $ 6 $ — $ — $ — $ 24 Selected average balances: Assets $ 36,936 $ 6,241 $ 4,972 $ 11,069 $ 6,117 $ 65,335 Loans 35,964 5,572 4,791 — — 46,327 Deposits 27,727 21,854 3,708 246 246 53,781 Statistical data: Return on average assets (a) 2.19 % 0.20 % 1.65 % N/M N/M 0.91 % Efficiency ratio (b) 31.28 92.03 73.40 N/M N/M 63.99 (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 September 30, 2015 Earnings summary: Net interest income (expense) (FTE) $ 180 $ 187 $ 129 $ 87 $ (160 ) $ 423 Provision for credit losses 6 24 10 (11 ) (3 ) 26 Noninterest income 85 38 34 96 11 264 Noninterest expenses 152 102 97 110 — 461 Provision (benefit) for income taxes (FTE) 36 37 20 25 (54 ) 64 Net income (loss) $ 71 $ 62 $ 36 $ 59 $ (92 ) $ 136 Net loan charge-offs $ 9 $ 10 $ 4 $ — $ — $ 23 Selected average balances: Assets $ 13,856 $ 17,060 $ 11,578 $ 8,462 $ 20,377 $ 71,333 Loans 13,223 16,789 10,997 7,963 — 48,972 Deposits 21,946 18,372 10,753 7,593 476 59,140 Statistical data: Return on average assets (a) 1.23 % 1.27 % 1.16 % 2.82 % N/M 0.76 % Efficiency ratio (b) 57.49 45.28 59.54 59.86 N/M 67.08 (dollar amounts in millions) Michigan California Texas Other Finance Total Three Months Ended September 30, 2014 Earnings summary: Net interest income (expense) (FTE) $ 179 $ 182 $ 130 $ 83 $ (159 ) $ 415 Provision for credit losses (8 ) 14 3 (6 ) 2 5 Noninterest income 83 37 36 42 17 215 Noninterest expenses 166 102 96 51 (18 ) 397 Provision (benefit) for income taxes (FTE) 38 40 25 21 (50 ) 74 Net income (loss) $ 66 $ 63 $ 42 $ 59 $ (76 ) $ 154 Net loan charge-offs (recoveries) $ 3 $ 6 $ — $ (6 ) $ — $ 3 Selected average balances: Assets $ 13,724 $ 15,768 $ 11,835 $ 7,695 $ 17,376 $ 66,398 Loans 13,248 15,509 11,147 7,255 — 47,159 Deposits 21,214 16,350 10,633 6,584 382 55,163 Statistical data: Return on average assets (a) 1.19 % 1.47 % 1.40 % 3.07 % N/M 0.93 % Efficiency ratio (b) 62.91 46.49 57.91 41.46 N/M 62.87 (a) Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity. (b) Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains. FTE – Fully Taxable Equivalent N/M – not meaningful (dollar amounts in millions) Michigan California Texas Other Markets Finance & Other Total Nine Months Ended September 30, 2015 Earnings summary: Net interest income (expense) (FTE) $ 537 $ 543 $ 390 $ 252 $ (463 ) $ 1,259 Provision for credit losses (15 ) 24 74 6 (2 ) 87 Noninterest income 251 112 101 277 39 780 Noninterest expenses 436 300 287 322 11 1,356 Provision (benefit) for income taxes (FTE) 124 124 48 56 (161 ) 191 Net income (loss) $ 243 $ 207 $ 82 $ 145 $ (272 ) $ 405 Net loan charge-offs $ 10 $ 16 $ 12 $ 11 $ — $ 49 Selected average balances: Assets $ 13,815 $ 16,741 $ 11,881 $ 8,151 $ 19,100 $ 69,688 Loans 13,245 16,473 11,260 7,677 — 48,655 Deposits 21,788 17,500 10,907 7,227 429 57,851 Statistical data: Return on average assets (a) 1.42 % 1.48 % 0.88 % 2.38 % N/M 0.78 % Efficiency ratio (b) 55.27 45.88 58.38 60.61 N/M 66.41 (dollar amounts in millions) Michigan California Texas Other Markets Finance & Other Total Nine Months Ended September 30, 2014 Earnings summary: Net interest income (expense) (FTE) $ 544 $ 531 $ 403 $ 231 $ (466 ) $ 1,243 Provision for credit losses (13 ) 39 32 (26 ) (7 ) 25 Noninterest income 256 110 104 123 50 643 Noninterest expenses 486 298 275 145 3 1,207 Provision (benefit) for income taxes (FTE) 118 115 72 60 (155 ) 210 Net income (loss) $ 209 $ 189 $ 128 $ 175 $ (257 ) $ 444 Net loan charge-offs $ 13 $ 21 $ 7 $ (17 ) $ — $ 24 Selected average balances: Assets $ 13,797 $ 15,543 $ 11,525 $ 7,284 $ 17,186 $ 65,335 Loans 13,400 15,259 10,829 6,839 — 46,327 Deposits 20,853 15,506 10,743 6,187 492 53,781 Statistical data: Return on average assets (a) 1.27 % 1.53 % 1.42 % 3.20 % N/M 0.91 % Efficiency ratio (b) 60.67 46.57 54.13 41.16 N/M 63.99 (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 Acc32

Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Increase In Card Fees Due To Presentation Change	$ 48	$ 136
Increase In Processing Fee Expense Due to Presentation Change	48	136
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in Other Assets Due to Early Adoption of ASU 2015-03	(4,232)	(4,232)	$ (4,434)
Decrease in Long-term Debt Due to Early Adoption of ASU 2015-03	(3,100)	(3,100)	(2,675)
Effect of Early Adoption of ASU 2015-03
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized Debt Issuance Costs	$ 9	$ 9
Effect of Early Adoption of ASU 2015-03 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in Other Assets Due to Early Adoption of ASU 2015-03			4
Decrease in Long-term Debt Due to Early Adoption of ASU 2015-03			$ 4

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Recurring
Transfers into or out of Level 1 or Level 2 or Level 3	$ 0	$ 0	$ 0	$ 0
Total liabilities at fair value	730		730		$ 756
Nonrecurring
Total liabilities at fair value	$ 0		$ 0		$ 0

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	[1]	$ 8,749	$ 8,116
Derivative assets		885	894
Derivative liabilities	[2]	511	528
Equity and Other Non-Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		206	242
U.S. Treasury and Other U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		930	526
Residential Mortgage-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	[3]	7,559	7,274
State And Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		9	23
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		45	51
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		93
Investment securities available-for-sale		8,749	8,116
Derivative assets		888	898
Total assets at fair value		9,730	9,108
Derivative liabilities		641	662
Deferred compensation plan liabilities		89	94
Total liabilities at fair value		730	756
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		92
Investment securities available-for-sale		1,067	656
Derivative assets		0	0
Total assets at fair value		1,159	750
Derivative liabilities		0	0
Deferred compensation plan liabilities		89	94
Total liabilities at fair value		89	94
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1
Investment securities available-for-sale		7,603	7,324
Derivative assets		874	894
Total assets at fair value		8,478	8,218
Derivative liabilities		640	661
Deferred compensation plan liabilities		0	0
Total liabilities at fair value		640	661
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
Investment securities available-for-sale		79	136
Derivative assets		14	4
Total assets at fair value		93	140
Derivative liabilities		1	1
Deferred compensation plan liabilities		0	0
Total liabilities at fair value		1	1
Recurring | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		375	328
Derivative liabilities		140	102
Recurring | Interest Rate Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Recurring | Interest Rate Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		364	328
Derivative liabilities		140	102
Recurring | Interest Rate Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		11	0
Derivative liabilities		0	0
Recurring | Energy Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		459	527
Derivative liabilities		456	525
Recurring | Energy Derivative Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Recurring | Energy Derivative Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		459	527
Derivative liabilities		456	525
Recurring | Energy Derivative Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Recurring | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		51	39
Derivative liabilities		44	34
Recurring | Foreign Exchange Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Recurring | Foreign Exchange Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		51	39
Derivative liabilities		44	34
Recurring | Foreign Exchange Contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Derivative liabilities		0	0
Recurring | Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		3	4
Recurring | Warrants | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Recurring | Warrants | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Recurring | Warrants | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		3	4
Recurring | Other Derivative Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		1	1
Recurring | Other Derivative Liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		0	0
Recurring | Other Derivative Liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		0	0
Recurring | Other Derivative Liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		1	1
Recurring | Deferred Compensation Plan Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		89	94
Recurring | Deferred Compensation Plan Assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		89	94
Recurring | Deferred Compensation Plan Assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Recurring | Deferred Compensation Plan Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Recurring | Equity and Other Non-Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		3
Investment securities available-for-sale		206	242
Recurring | Equity and Other Non-Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		3
Investment securities available-for-sale		137	130
Recurring | Equity and Other Non-Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
Investment securities available-for-sale		0	0
Recurring | Equity and Other Non-Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
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		930	526
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		930	526
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0	0
Recurring | U.S. Treasury and Other U.S. Government Agency Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0	0
Recurring | Residential Mortgage-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	[4]	7,559	7,274
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	[4]	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	[4]	7,559	7,274
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	[4]	0	0
Recurring | State And Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1
Investment securities available-for-sale		9	23
Recurring | State And Municipal Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
Investment securities available-for-sale		0	0
Recurring | State And Municipal Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1
Investment securities available-for-sale		0	0
Recurring | State And Municipal Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0
Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		45	51
Recurring | Corporate Debt Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0	0
Recurring | Corporate Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		44	50
Recurring | Corporate Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	[5]	$ 1	$ 1
[1]	Included auction-rate securities at amortized cost and fair value of $80 million and $79 million, respectively as of September 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.
[2]	Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $5 million and $2 million at September 30, 2015 and December 31, 2014, respectively.
[3]	Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
[4]	Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
[5]	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				9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014
Interest Rate Contracts
Balance at beginning of period		$ 2				$ 0
Realized gains (losses) recorded in earnings		0				0
Unrealized gains (losses) recorded in earnings	[1]	9				11
Gains (losses) recorded in other comprehensive income		0				0
Sales		0				0
Balance at end of period		11				11
Warrants
Balance at beginning of period		3		$ 4		4		$ 3
Realized gains (losses) recorded in earnings	[1]	5		2		6		6
Unrealized gains (losses) recorded in earnings		0		0		(1)	[1]	1	[1]
Gains (losses) recorded in other comprehensive income		0		0		0		0
Sales		(5)		(2)		(6)		(6)
Balance at end of period		3		4		3		4
Other Derivative Liabilities
Balance at beginnning of period		1		2		1		2
Realized gains (losses) recorded in earnings		0		0		0		0
Unrealized gains (losses) recorded in earnings		0		(1)	[2]	0		(1)	[2]
Gains (losses) recorded in other comprehensive income		0		0		0		0
Sales		0		0		0		0
Balance at end of period		1		3		1		3
Investment Securities Available-For-Sale
Balance at beginning of period		95		142		136		159
Realized gains (losses) recorded in earnings		0		1	[2]	(2)	[2]	2	[2]
Unrealized gains (losses) recorded in earnings		0		0		0		0
Gains (losses) recorded in other comprehensive income		(1)	[3]	1	[3]	0		8	[3]
Sales		(15)		(7)		(55)		(32)
Balance at end of period		79		137		79		137
State And Municipal Securities | Investment Securities Available-For-Sale
Balance at beginning of period	[4]	23		23		23		22
Realized gains (losses) recorded in earnings	[4]	0		0		0		0
Unrealized gains (losses) recorded in earnings	[4]	0		0		0		0
Gains (losses) recorded in other comprehensive income	[4]	0		0		0		1	[3]
Sales	[4]	(14)		0		(14)		0
Balance at end of period	[4]	9		23		9		23
Corporate Debt Securities | Investment Securities Available-For-Sale
Balance at beginning of period	[4]	1		1		1		1
Realized gains (losses) recorded in earnings	[4]	0		0		0		0
Unrealized gains (losses) recorded in earnings	[4]	0		0		0		0
Gains (losses) recorded in other comprehensive income	[4]	0		0		0		0
Sales	[4]	0		0		0		0
Balance at end of period	[4]	1		1		1		1
Equity and Other Non-Debt Securities | Investment Securities Available-For-Sale
Balance at beginning of period	[4]	71		118		112		136
Realized gains (losses) recorded in earnings	[4]	0		1	[2]	(2)	[2]	2	[2]
Unrealized gains (losses) recorded in earnings	[4]	0		0		0		0
Gains (losses) recorded in other comprehensive income	[4]	(1)	[3]	1	[3]	0		7	[3]
Sales	[4]	(1)		(7)		(41)		(32)
Balance at end of period	[4]	$ 69		$ 113		$ 69		$ 113
[1]	Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income.
[2]	Realized and unrealized gains and losses due to changes in fair value recorded in "net securities gains" on the consolidated statements of comprehensive income.
[3]	Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income.
[4]	Auction-rate securities.

Fair Value Measurements (Asse36

Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) - Nonrecurring - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 144	$ 64
Nonmarketable equity securities	1	2
Other real estate	3	2
Total assets at fair value	160	68
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Nonmarketable equity securities	0	0
Other real estate	0	0
Total assets at fair value	12	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	144	64
Nonmarketable equity securities	1	2
Other real estate	3	2
Total assets at fair value	148	68
Commercial borrower | International loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	8
Commercial borrower | International loans | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0
Commercial borrower | International loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	8
Commercial borrower | Domestic loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	12
Loans	124	38
Commercial borrower | Domestic loans | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	12
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
Loans	124	38
Commercial borrower | Commercial Mortgage Loans | Domestic loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	12	26
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	$ 12	$ 26

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Information About Level 3 Measurements) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	[1]	$ 8,749	$ 8,116
Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale		8,749	8,116
Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale		79	136
Recurring | State And Municipal Securities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	[2]	$ 9	$ 23
Recurring | State And Municipal Securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate		3.00%	3.00%
Unobservable Input, Workout period		1 year	1 year
Recurring | State And Municipal Securities | Maximum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate		10.00%	9.00%
Unobservable Input, Workout period		3 years	3 years
Recurring | Equity and Other Non-Debt Securities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investment securities available-for-sale	[2]	$ 69	$ 112
Recurring | Equity and Other Non-Debt Securities | Minimum | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Discount rate		4.00%	4.00%
Unobservable Input, Workout period		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		9.00%	8.00%
Unobservable Input, Workout period		2 years	2 years
[1]	Included auction-rate securities at amortized cost and fair value of $80 million and $79 million, respectively as of September 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.
[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		Sep. 30, 2015	Dec. 31, 2014
Cash and due from banks		$ 1,101	$ 1,026
Interest-bearing deposits with banks		6,099	5,045
Investment securities held-to-maturity		1,863	1,935
Total loans, net of allowance for loan losses		48,320	47,999
Demand deposits (noninterest-bearing)		28,697	27,224
Customer certificates of deposit		4,126	4,421
Total deposits		58,768	57,486
Short-term borrowings		109	116
Medium- and long-term debt		3,100	2,675
Carrying Amount
Cash and due from banks		1,101	1,026
Interest-bearing deposits with banks		6,099	5,045
Investment securities held-to-maturity		1,863	1,935
Loans held-for-sale	[1]	15	5
Total loans, net of allowance for loan losses	[2]	48,320	47,999
Customers' liability on acceptances outstanding		5	10
Nonmarketable equity securities	[3]	10	11
Restricted equity investments		92	92
Demand deposits (noninterest-bearing)		28,697	27,224
Interest-bearing deposits		25,945	25,841
Customer certificates of deposit		4,126	4,421
Total deposits		58,768	57,486
Short-term borrowings		109	116
Acceptances outstanding		5	10
Medium- and long-term debt		3,100	2,675
Credit-related financial instruments		(89)	(85)
Estimated Fair Value
Cash and due from banks		1,101	1,026
Interest-bearing deposits with banks		6,099	5,045
Investment securities held-to-maturity		1,872	1,933
Loans held-for-sale	[1]	15	5
Total loans, net of allowance for loan losses	[2]	48,244	47,932
Customers' liability on acceptances outstanding		5	10
Nonmarketable equity securities	[3]	19	18
Restricted equity investments		92	92
Demand deposits (noninterest-bearing)		28,697	27,224
Interest-bearing deposits		25,945	25,841
Customer certificates of deposit		4,119	4,411
Total deposits		58,761	57,476
Short-term borrowings		109	116
Acceptances outstanding		5	10
Medium- and long-term debt		3,047	2,681
Credit-related financial instruments		(89)	(85)
Level 1 | Estimated Fair Value
Cash and due from banks		1,101	1,026
Interest-bearing deposits with banks		6,099	5,045
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		5	10
Nonmarketable equity securities	[3]	0	0
Restricted equity investments		92	92
Demand deposits (noninterest-bearing)		0	0
Interest-bearing deposits		0	0
Customer certificates of deposit		0	0
Total deposits		0	0
Short-term borrowings		109	116
Acceptances outstanding		5	10
Medium- and long-term debt		0	0
Credit-related financial instruments		0	0
Level 2 | Estimated Fair Value
Cash and due from banks		0	0
Interest-bearing deposits with banks		0	0
Investment securities held-to-maturity		1,872	1,933
Loans held-for-sale	[1]	15	5
Total loans, net of allowance for loan losses	[2]	0	0
Customers' liability on acceptances outstanding		0	0
Nonmarketable equity securities	[3]	0	0
Restricted equity investments		0	0
Demand deposits (noninterest-bearing)		28,697	27,224
Interest-bearing deposits		25,945	25,841
Customer certificates of deposit		4,119	4,411
Total deposits		58,761	57,476
Short-term borrowings		0	0
Acceptances outstanding		0	0
Medium- and long-term debt		3,047	2,681
Credit-related financial instruments		0	0
Level 3 | Estimated Fair Value
Cash and due from banks		0	0
Interest-bearing deposits with banks		0	0
Investment securities held-to-maturity		0	0
Loans held-for-sale	[1]	0	0
Total loans, net of allowance for loan losses	[2]	48,244	47,932
Customers' liability on acceptances outstanding		0	0
Nonmarketable equity securities	[3]	19	18
Restricted equity investments		0	0
Demand deposits (noninterest-bearing)		0	0
Interest-bearing deposits		0	0
Customer certificates of deposit		0	0
Total deposits		0	0
Short-term borrowings		0	0
Acceptances outstanding		0	0
Medium- and long-term debt		0	0
Credit-related financial instruments		(89)	(85)
Nonrecurring
Nonmarketable equity securities		1	2
Nonrecurring | Level 2
Loans held-for-sale		12	0
Nonmarketable equity securities		0	0
Nonrecurring | Level 3
Total loans, net of allowance for loan losses		144	64
Nonmarketable equity securities		$ 1	$ 2
[1]	Included $12 million and no impaired loans held-for-sale recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014, respectively.
[2]	Included $144 million and $64 million of impaired loans recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014, respectively.
[3]	Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at September 30, 2015 and December 31, 2014, respectively.

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Millions		9 Months Ended
		Sep. 30, 2015USD ($)Security	Dec. 31, 2014USD ($)
Securities with no credit impairment in unrealized loss position | Security		123
Investment securities available-for-sale, Amortized Cost	[1]	$ 8,622	$ 8,035
Investment securities available-for-sale, Fair Value	[1]	8,749	8,116
Investment securities held-to-maturity, Amortized Cost		1,863	1,935
Investment securities held-to-maturity, Fair Value		1,872
Carrying value of securities pledged		2,900
Liabilities secured by pledged collateral		$ 2,100
Residential Mortgage-Backed Securities
Securities with no credit impairment in unrealized loss position | Security		68
Investment securities available-for-sale, Amortized Cost	[2]	$ 7,445	7,192
Investment securities available-for-sale, Fair Value	[2]	7,559	7,274
Investment securities held-to-maturity, Amortized Cost	[2],[3]	1,863	1,935
Investment securities held-to-maturity, Fair Value	[2],[3]	$ 1,872	1,933
Auction Rate Preferred Securities
Securities with no credit impairment in unrealized loss position		38
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 Securities
ARS portfolio redeemed or sold since acquisition		94.00%
ARS portfolio redeemed or sold since acquisition at or above cost		91.00%
Investment securities available-for-sale, Amortized Cost		$ 80	137
Investment securities available-for-sale, Fair Value		79	$ 136
Prepayment options | Residential Mortgage-Backed Securities
Investment securities available-for-sale, Amortized Cost		7,400
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 $80 million and $79 million, respectively as of September 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.
[2]	Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
[3]	The amortized cost of investment securities held-to-maturity included net unrealized losses of $17 million at September 30, 2015 and $23 million at December 31, 2014 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		Sep. 30, 2015	Dec. 31, 2014
Investment securities available-for-sale, Amortized Cost	[1]	$ 8,622	$ 8,035
Investment securities available-for-sale securities, Gross Unrealized Gains	[1]	147	123
Investment securities available-for-sale securities, Gross Unrealized Losses	[1]	20	42
Investment securities available-for-sale, Fair Value	[1]	8,749	8,116
Investment securities held-to-maturity, Amortized Cost		1,863	1,935
Investment securities held-to-maturity, Fair Value		1,872
Net unrealized losses on available-for-sale securities transferred to held-to-maturity		17	23
U.S. Treasury and Other U.S. Government Agency Securities
Investment securities available-for-sale, Amortized Cost		917	526
Investment securities available-for-sale securities, Gross Unrealized Gains		13	0
Investment securities available-for-sale securities, Gross Unrealized Losses		0	0
Investment securities available-for-sale, Fair Value		930	526
Residential Mortgage-Backed Securities
Investment securities available-for-sale, Amortized Cost	[2]	7,445	7,192
Investment securities available-for-sale securities, Gross Unrealized Gains	[2]	133	122
Investment securities available-for-sale securities, Gross Unrealized Losses	[2]	19	40
Investment securities available-for-sale, Fair Value	[2]	7,559	7,274
Investment securities held-to-maturity, Amortized Cost	[2],[3]	1,863	1,935
Investment securities held-to-maturity, Gross Unrealized Gains	[2],[3]	10	0
Investment securities held-to-maturity, Gross Unrealized Losses	[2],[3]	1	2
Investment securities held-to-maturity, Fair Value	[2],[3]	1,872	1,933
State And Municipal Securities
Investment securities available-for-sale, Amortized Cost		9	24
Investment securities available-for-sale securities, Gross Unrealized Gains		0	0
Investment securities available-for-sale securities, Gross Unrealized Losses		0	1
Investment securities available-for-sale, Fair Value		9	23
Corporate Debt Securities
Investment securities available-for-sale, Amortized Cost		45	51
Investment securities available-for-sale securities, Gross Unrealized Gains		0	0
Investment securities available-for-sale securities, Gross Unrealized Losses		0	0
Investment securities available-for-sale, Fair Value		45	51
Equity and Other Non-Debt Securities
Investment securities available-for-sale, Amortized Cost		206	242
Investment securities available-for-sale securities, Gross Unrealized Gains		1	1
Investment securities available-for-sale securities, Gross Unrealized Losses		1	1
Investment securities available-for-sale, Fair Value		206	242
Auction-Rate Securities
Investment securities available-for-sale, Amortized Cost		80	137
Investment securities available-for-sale, Fair Value		$ 79	$ 136
[1]	Included auction-rate securities at amortized cost and fair value of $80 million and $79 million, respectively as of September 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.
[2]	Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
[3]	The amortized cost of investment securities held-to-maturity included net unrealized losses of $17 million at September 30, 2015 and $23 million at December 31, 2014 related to securities transferred from available-for-sale, which are included in accumulated other comprehensive loss.

Investment Securities (Summar41

Investment Securities (Summary Of Investment Securities Available-For-Sale In Unrealized Loss Positions) (Details) - USD ($) $ in Millions		Sep. 30, 2015		Dec. 31, 2014
Temporarily Impaired Less than 12 months, Fair Value		$ 712		$ 924
Temporarily Impaired 12 months or more, Fair Value		2,081		3,247
Temporarily Impaired Total, Fair Value		2,793		4,171
Temporarily Impaired Less than 12 Months, Unrealized Losses		4		3
Temporarily Impaired 12 Months or more, Unrealized Losses		37		73
Temporarily Impaired Total, Unrealized Losses		41		76
U.S. Treasury and Other U.S. Government Agency Securities
Temporarily Impaired Less than 12 months, Fair Value				298
Temporarily Impaired 12 months or more, Fair Value				0
Temporarily Impaired Total, Fair Value				298
Temporarily Impaired Less than 12 Months, Unrealized Losses	[1]			0
Temporarily Impaired 12 Months or more, Unrealized Losses				0
Temporarily Impaired Total, Unrealized Losses	[1]			0
Residential Mortgage-Backed Securities
Temporarily Impaired, Less than 12 Months, Fair Value	[2]	642		626
Temporarily Impaired, 12 Months or more, Fair Value	[2]	2,071		3,112
Temporarily Impaired Total, Fair Value	[2]	2,713		3,738
Temporarily Impaired, Less than 12 Months, Unrealized Losses	[2]	3		3
Temporarily Impaired, 12 Months or more, Unrealized Losses	[2]	37		71
Temporarily Impaired Total, Unrealized Losses	[2]	40		74
State And Municipal Securities
Temporarily Impaired Less than 12 months, Fair Value	[3]	0		0
Temporarily Impaired 12 months or more, Fair Value	[3]	9		22
Temporarily Impaired Total, Fair Value	[3]	9		22
Temporarily Impaired Less than 12 Months, Unrealized Losses	[3]	0		0
Temporarily Impaired 12 Months or more, Unrealized Losses	[3]	0	[1]	1
Temporarily Impaired Total, Unrealized Losses	[3]	0	[1]	1
Corporate Debt Securities
Temporarily Impaired Less than 12 months, Fair Value	[3]	0		0
Temporarily Impaired 12 months or more, Fair Value	[3]	1		1
Temporarily Impaired Total, Fair Value	[3]	1		1
Temporarily Impaired Less than 12 Months, Unrealized Losses	[3]	0		0
Temporarily Impaired 12 Months or more, Unrealized Losses	[1],[3]	0		0
Temporarily Impaired Total, Unrealized Losses	[1],[3]	0		0
Equity and Other Non-Debt Securities
Temporarily Impaired Less than 12 months, Fair Value	[3]	70		0
Temporarily Impaired 12 months or more, Fair Value	[3]	0		112
Temporarily Impaired Total, Fair Value	[3]	70		112
Temporarily Impaired Less than 12 Months, Unrealized Losses	[3]	1		0
Temporarily Impaired 12 Months or more, Unrealized Losses	[3]	0		1
Temporarily Impaired Total, Unrealized Losses	[3]	$ 1		$ 1
[1]	Unrealized losses less than $0.5 million.
[2]	Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
[3]	Auction-rate securities.

Investment Securities Investmen

Investment Securities Investment Securities (Gains and Losses on Available-For-Sale Securities) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Securities gains	$ 0	$ 0	$ 0	$ 1
Securities losses	0	(1)	(2)	(1)
Net securities losses	$ 0	$ (1)	$ (2)	$ 0

Investment Securities (Contract

Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Available-for-sale, Within one year, Amortized Cost		$ 74
Available-for-sale, After one year through five years, Amortized Cost		1,123
Available-for-sale, After five years through ten years, Amortized Cost		929
Available-for-sale, After ten years, Amortized Cost		6,290
Available-for-sale, Subtotal, Amortized Cost		8,416
Available-for-sale, Within one year, Fair Value		74
Available-for-sale, After one year through five years, Fair Value		1,136
Available-for-sale, After five years through ten years, Fair Value		976
Available-for-sale, After ten years, Fair Value		6,357
Available-for-sale, Subtotal, Fair Value		8,543
Investment securities available-for-sale, Amortized Cost	[1]	8,622	$ 8,035
Investment securities available-for-sale, Fair Value	[1]	8,749	8,116
Held-to-maturity, Within one year, Net Carrying Amount		0
Held-to-maturity, After one year through five Years, Net Carrying Amount		0
Held-to-maturity, After five years through ten years, Net Carrying Amount		0
Held-to-maturities, After ten years, Net Carrying Amount		1,863
Held-to-maturity Securities		1,863	1,935
Held-to-maturity, Within one year, Fair Value		0
Held-to-maturity Securities, After one year through five years, Fair Value		0
Held-to-maturity Securities, After five years through ten years, Fair Value		0
Held-to-maturity Securities, After ten years, Fair Value		1,872
Held-to-maturity Securities, Fair Value		1,872
Equity and Other Non-Debt Securities
Investment securities available-for-sale, Amortized Cost		206	242
Investment securities available-for-sale, Fair Value		$ 206	$ 242
[1]	Included auction-rate securities at amortized cost and fair value of $80 million and $79 million, respectively as of September 30, 2015 and $137 million and $136 million, respectively, as of December 31, 2014.

Credit Quality And Allowance 44

Credit Quality And Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Retail loans secured by residential real estate in process of foreclosure	$ 1		$ 1
Commitments to lend additional funds to TDR borrowers	1		1		$ 3
Allowance for PCI loans	0		0		$ 0
Interest Rate Reductions
Carrying value at period end of loans modified during the period	2	$ 3	2	$ 3
Subsequent default during period	$ 0	$ 0	$ 0	$ 0

Credit Quality And Allowance 45

Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		$ 162	$ 168
Nonaccrual loans		357	273
Current loans		48,423	48,152
Total loans		48,942	48,593
30 to 59 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		144	132
60 to 89 days past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		13	31
90 days or more past due and still accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		5	5
Business loans | Commercial borrower
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		141	136
Nonaccrual loans		297	206
Current loans		44,133	44,038
Total loans		44,571	44,380
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		125	106
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		11	26
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		5	4
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		93	72
Nonaccrual loans		214	109
Current loans		31,470	31,339
Total loans		31,777	31,520
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		83	58
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		8	13
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	1
Business loans | Commercial borrower | International loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		4	9
Nonaccrual loans		8	0
Current loans		1,370	1,487
Total loans		1,382	1,496
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		3	9
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		0	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		1	0
Business loans | Real estate construction | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		5	15
Nonaccrual loans		1	2
Current loans		1,868	1,938
Total loans		1,874	1,955
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		5	15
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		0	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]	4	3
Nonaccrual loans	[1]	0	1
Current loans	[1]	1,558	1,602
Total loans	[1],[2]	1,562	1,606
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]	4	3
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]	1	12
Nonaccrual loans	[3]	1	1
Current loans	[3]	310	336
Total loans	[3],[4]	312	349
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]	1	12
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]	0	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		39	40
Nonaccrual loans		66	95
Current loans		8,682	8,469
Total loans		8,787	8,604
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		34	24
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		3	13
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	3
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]	21	10
Nonaccrual loans	[1]	17	22
Current loans	[1]	1,964	1,758
Total loans	[1],[2]	2,002	1,790
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]	21	8
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]	0	1
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]	18	30
Nonaccrual loans	[3]	49	73
Current loans	[3]	6,718	6,711
Total loans	[3],[4]	6,785	6,814
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]	13	16
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]	3	12
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	2
Business loans | Lease financing | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		751	805
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
Nonaccrual loans		8	0
Current loans		743	805
Total loans		751	805
Retail loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		21	32
Nonaccrual loans		60	67
Current loans		4,290	4,114
Total loans		4,371	4,213
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		19	26
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		2	5
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		0	1
Retail loans | Consumer borrower
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		8	21
Nonaccrual loans		29	31
Current loans		2,454	2,330
Total loans		2,491	2,382
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		7	17
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		1	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	1
Retail loans | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		13	11
Nonaccrual loans		31	36
Current loans		1,836	1,784
Total loans		1,880	1,831
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		12	9
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	2
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		0	0
Retail loans | Home equity | Consumer borrower
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due and still accruing		6	8
Nonaccrual loans		28	30
Current loans		1,680	1,620
Total loans		1,714	1,658
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		1	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	13
Nonaccrual loans		1	1
Current loans		774	710
Total loans		777	724
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		2	12
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		0	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	$ 1
[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 46

Credit Quality And Allowance For Credit Losses (Loans By Credit Quality Indicator) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total loans		$ 48,942	$ 48,593
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	46,044	46,700
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1,324	831
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	1,217	789
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	357	273
Business loans | Commercial borrower
Financing Receivable, Recorded Investment [Line Items]
Total loans		44,571	44,380
Business loans | Commercial borrower | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	41,789	42,572
Business loans | Commercial borrower | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1,313	826
Business loans | Commercial borrower | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	1,172	776
Business loans | Commercial borrower | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	297	206
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		31,777	31,520
Business loans | Commercial borrower | Domestic loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	29,571	30,310
Business loans | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1,035	560
Business loans | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	957	541
Business loans | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	214	109
Business loans | Commercial borrower | International loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,382	1,496
Business loans | Commercial borrower | International loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,281	1,468
Business loans | Commercial borrower | International loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	69	15
Business loans | Commercial borrower | International loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	24	13
Business loans | Commercial borrower | International loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	8	0
Business loans | Real estate construction | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,874	1,955
Business loans | Real estate construction | Commercial borrower | Domestic loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,857	1,930
Business loans | Real estate construction | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	0	18
Business loans | Real estate construction | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	16	5
Business loans | Real estate construction | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	1	2
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	[5],[6]	1,562	1,606
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]	1,554	1,594
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	11
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]	8	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	1
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	[7],[8]	312	349
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[8]	303	336
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[8]	0	7
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[8]	8	5
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[8]	1	1
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		8,787	8,604
Business loans | Real estate | Commercial borrower | Domestic loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	8,361	8,086
Business loans | Real estate | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	193	207
Business loans | Real estate | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	167	216
Business loans | Real estate | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	66	95
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Recorded Investment [Line Items]
Total loans	[5],[6]	2,002	1,790
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[6]	1,920	1,652
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]	33	69
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[6]	32	47
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[6]	17	22
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	[7],[8]	6,785	6,814
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1],[8]	6,441	6,434
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2],[8]	160	138
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3],[8]	135	169
Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4],[8]	49	73
Business loans | Lease financing | Commercial borrower | Domestic loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		751	805
Business loans | Lease financing | Commercial borrower | Domestic loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	719	778
Business loans | Lease financing | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	16	26
Business loans | Lease financing | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	8	1
Business loans | Lease financing | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	8	0
Retail loans
Financing Receivable, Recorded Investment [Line Items]
Total loans		4,371	4,213
Retail loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	4,255	4,128
Retail loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	11	5
Retail loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	45	13
Retail loans | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	60	67
Retail loans | Consumer borrower
Financing Receivable, Recorded Investment [Line Items]
Total loans		2,491	2,382
Retail loans | Consumer borrower | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	2,439	2,338
Retail loans | Consumer borrower | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	10	3
Retail loans | Consumer borrower | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	13	10
Retail loans | Consumer borrower | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	29	31
Retail loans | Real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,880	1,831
Retail loans | Real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,816	1,790
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]	32	3
Retail loans | Real estate | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	31	36
Retail loans | Home equity | Consumer borrower
Financing Receivable, Recorded Investment [Line Items]
Total loans		1,714	1,658
Retail loans | Home equity | Consumer borrower | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	1,682	1,620
Retail loans | Home equity | Consumer borrower | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	1	0
Retail loans | Home equity | Consumer borrower | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	3	8
Retail loans | Home equity | Consumer borrower | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	28	30
Retail loans | Other consumer | Consumer borrower
Financing Receivable, Recorded Investment [Line Items]
Total loans		777	724
Retail loans | Other consumer | Consumer borrower | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	[1]	757	718
Retail loans | Other consumer | Consumer borrower | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	[2]	9	3
Retail loans | Other consumer | Consumer borrower | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	[3]	10	2
Retail loans | Other consumer | Consumer borrower | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total loans	[4]	$ 1	$ 1
[1]	Includes all loans not included in the categories of special mention, substandard or nonaccrual.
[2]	Special mention loans are accruing loans that have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date.
[3]	Substandard loans are accruing loans that have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans also are distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. This category is generally consistent with the "substandard" category as defined by regulatory authorities.
[4]	Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-55 in the Corporation's 2014 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.
[5]	Primarily loans to real estate developers.
[6]	Primarily loans to real estate developers.
[7]	Primarily loans secured by owner-occupied real estate.
[8]	Primarily loans secured by owner-occupied real estate.

Credit Quality And Allowance 47

Credit Quality And Allowance For Credit Losses (Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Nonaccrual loans		$ 357	$ 273
Reduced-rate loans	[1]	12	17
Total nonperforming loans		369	290
Foreclosed property	[2]	12	10
Total nonperforming assets		381	300
Business loans
Reduced-rate loans		0	0
Retail loans
Nonaccrual loans		60	67
Reduced-rate loans		$ 12	$ 17
[1]	Reduced-rate business loans were zero at both September 30, 2015 and December 31, 2014, and reduced-rate retail loans were $12 million and $17 million at September 30, 2015 and December 31, 2014, respectively.
[2]	Foreclosed residential real estate properties.

Credit Quality And Allowance 48

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Net loan charge-offs	$ (23)	$ (3)	$ (49)	$ (24)
Provision for loan losses	26	5	87	25
Purchased credit impaired (PCI) loans					$ 2	$ 2
Total loans					$ 48,942	48,593
Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	618	591	594	598
Loan charge-offs	(34)	(24)	(92)	(82)
Recoveries on loans previously charged-off	11	21	43	58
Net loan charge-offs	(23)	(3)	(49)	(24)
Provision for loan losses	28	4	79	18
Foreign currency translation adjustment	(1)	0	(2)	0
Balance at end of period	622	592	622	592
As a percentage of total loans					1.27%		1.24%
Allowance for loan losses individually evaluated for impairment					$ 47		$ 40
Allowance for loan losses collectively evaluated for impairment					575		552
Total allowance for loan losses	618	591	594	598	622	594	592
Loans individually evaluated for impairment					389		248
Loans collectively evaluated for impairment					48,551		47,457
Purchased credit impaired (PCI) loans					2		3
Total loans					$ 48,942		$ 47,708
Business loans | Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	563	528	534	531
Loan charge-offs	(31)	(20)	(83)	(71)
Recoveries on loans previously charged-off	10	19	38	50
Net loan charge-offs	(21)	(1)	(45)	(21)
Provision for loan losses	25	2	79	19
Foreign currency translation adjustment	(1)	0	(2)	0
Balance at end of period	566	529	566	529
As a percentage of total loans					1.27%		1.21%
Allowance for loan losses individually evaluated for impairment					$ 47		$ 40
Allowance for loan losses collectively evaluated for impairment					519		489
Total allowance for loan losses	563	528	534	531	566	534	529
Loans individually evaluated for impairment					338		204
Loans collectively evaluated for impairment					44,233		43,384
Purchased credit impaired (PCI) loans					0		0
Total loans					44,571		$ 43,588
Retail loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans					$ 4,371	4,213
Retail loans | Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	55	63	60	67
Loan charge-offs	(3)	(4)	(9)	(11)
Recoveries on loans previously charged-off	1	2	5	8
Net loan charge-offs	(2)	(2)	(4)	(3)
Provision for loan losses	3	2	0	(1)
Foreign currency translation adjustment	0	0	0	0
Balance at end of period	56	63	56	63
As a percentage of total loans					1.29%		1.52%
Allowance for loan losses individually evaluated for impairment					$ 0		$ 0
Allowance for loan losses collectively evaluated for impairment					56		63
Total allowance for loan losses	$ 55	$ 63	$ 60	$ 67	56	$ 60	63
Loans individually evaluated for impairment					51		44
Loans collectively evaluated for impairment					4,318		4,073
Purchased credit impaired (PCI) loans					2		3
Total loans					$ 4,371		$ 4,120

Credit Quality And Allowance 49

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		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses		$ 26	$ 5	$ 87	$ 25
Lending-related commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		50	42	41	36
Charge-offs on lending related commitments	[1]	0	0	(1)	0
Provision for credit losses		(2)	1	8	7
Balance at end of period		$ 48	$ 43	$ 48	$ 43
[1]	Charge-offs result from the sale of unfunded lending-related commitments.

Credit Quality And Allowance 50

Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		$ 124	$ 53
Recorded investment in impaired loans with related allowance		265	166
Recorded investment total impaired loans		389	219
Unpaid principal balance		494	304
Related allowance for loan losses		47	39
Business loans | Commercial borrower
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		73	11
Recorded investment in impaired loans with related allowance		265	166
Recorded investment total impaired loans		338	177
Unpaid principal balance		435	253
Related allowance for loan losses		47	39
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		60	7
Recorded investment in impaired loans with related allowance		216	103
Recorded investment total impaired loans		276	110
Unpaid principal balance		327	148
Related allowance for loan losses		37	29
Business loans | Commercial borrower | International loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		0
Recorded investment in impaired loans with related allowance		10
Recorded investment total impaired loans		10
Unpaid principal balance		17
Related allowance for loan losses		3
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[1]	0	0
Recorded investment in impaired loans with related allowance	[1]	1	1
Recorded investment total impaired loans	[1]	1	1
Unpaid principal balance	[1]	1	1
Related allowance for loan losses	[1]	0	0
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance		13	4
Recorded investment in impaired loans with related allowance		38	62
Recorded investment total impaired loans		51	66
Unpaid principal balance		90	104
Related allowance for loan losses		7	10
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	[2]	7	0
Recorded investment in impaired loans with related allowance	[2]	8	19
Recorded investment total impaired loans	[2]	15	19
Unpaid principal balance	[2]	38	41
Related allowance for loan losses	[2]	2	8
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	[1]	6	4
Recorded investment in impaired loans with related allowance	[1]	30	43
Recorded investment total impaired loans	[1]	36	47
Unpaid principal balance	[1]	52	63
Related allowance for loan losses	[1]	5	2
Retail loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	[3]	51	42
Recorded investment in impaired loans with related allowance	[3]	0	0
Recorded investment total impaired loans	[3]	51	42
Unpaid principal balance	[3]	59	51
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		20	17
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		20	17
Unpaid principal balance		27	23
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		31	25
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		31	25
Unpaid principal balance		32	28
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		16	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		8	5
Recorded investment in impaired loans with related allowance		0	0
Recorded investment total impaired loans		8	5
Unpaid principal balance		11	7
Related allowance for loan losses		$ 0	$ 0
[1]	Primarily loans secured by owner-occupied real estate.
[2]	Primarily loans to real estate developers.
[3]	Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy changes which resulted in direct write-downs of restructured retail loans.

Credit Quality And Allowance 51

Credit Quality And Allowance For Credit Losses (Average Individually Evaluated Impaired Loans And Related Interest Recognized) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		$ 340	$ 254	$ 276	$ 259
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		2	1	4	3
Business loans | Commercial borrower
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		298	210	235	212
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		2	1	4	3
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		236	74	172	68
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		1	1	3	1
Business loans | Commercial borrower | International loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		10	1	5	2
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period				0	18
Individually Evaluated Impaired Loans Interest Income Recognized for the Period				0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	[1]	0	16	0	17
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[1]	0	0	0	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period	[2]			0	1
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[2]			0	0
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		52	119	58	124
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		1	0	1	2
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]	15	49	17	56
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[1]	0	0	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]	37	70	41	68
Individually Evaluated Impaired Loans Interest Income Recognized for the Period	[2]	1	0	1	2
Retail loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		42	44	41	47
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans | Consumer borrower
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		19	15	18	16
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans | Real estate
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		23	29	23	31
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans | Home equity | Consumer borrower
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		12	11	12	12
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		0	0	0	0
Retail loans | Other consumer | Consumer borrower
Financing Receivable, Impaired [Line Items]
Individually Evaluated Impaired Loans Average Balance for the Period		7	4	6	4
Individually Evaluated Impaired Loans Interest Income Recognized for the Period		$ 0	$ 0	$ 0	$ 0
[1]	Primarily loans to real estate developers.
[2]	Primarily loans secured by owner-occupied real estate.

Credit Quality And Allowance 52

Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings By Type Of Modification) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		$ 132	$ 9	$ 140	$ 17
Business loans | Commercial borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		112	8	120	14
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		100	2	102	3
Business loans | Commercial borrower | International loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		2	0	2	1
Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		10	6	16	10
Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	7	0	9	0
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	[2]	3	6	7	10
Retail loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		20	1	20	3
Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		18	0	18	0
Retail loans | Home equity | Consumer borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		2	1	2	3
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	131	9	$ 139	$ 15
Extension Term, Minimum Period				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	[3]	112	8	$ 120	$ 14
Principal Deferrals | Business loans | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	100	2	102	3
Principal Deferrals | Business loans | Commercial borrower | International loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	2	0	2	1
Principal Deferrals | Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	10	6	16	10
Principal Deferrals | Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1],[3]	7	0	9	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	[2],[3]	3	6	7	10
Principal Deferrals | Retail loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	19	1	19	1
Principal Deferrals | Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	18	0	18	0
Principal Deferrals | Retail loans | Home equity | Consumer borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[3]	1	1	1	1
Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		1	0	1	2
Interest Rate Reductions | Business loans | Commercial borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0	0	0	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	0	0	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	0	0	0
Interest Rate Reductions | Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0	0	0	0
Interest Rate Reductions | Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period	[1]	0	0	0	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	[2]	0	0	0	0
Interest Rate Reductions | Retail loans
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		1	0	1	2
Interest Rate Reductions | Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		0	0	0	0
Interest Rate Reductions | Retail loans | Home equity | Consumer borrower
Financing Receivable, Modifications [Line Items]
Recorded balance of troubled debt restructuring modified during the period		$ 1	$ 0	$ 1	$ 2
[1]	Primarily loans to real estate developers.
[2]	Primarily loans secured by owner-occupied real estate.
[3]	Primarily represents loan balances where terms were extended 90 days or more at or above contractual interest rates.

Credit Quality And Allowance 53

Credit Quality And Allowance For Credit Losses Credit Quality And Allowance For Credit Losses (Troubled Debt Restructuring Subsequent Default) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance		$ 145	$ 32	$ 145	$ 32
Subsequent default during period		1	10	4	13
Principal Deferrals | Business loans | Commercial borrower
Financing Receivable, Modifications [Line Items]
Balance		126	28	126	28
Subsequent default during period		1	10	4	13
Principal Deferrals | Business loans | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Balance		108	13	108	13
Subsequent default during period		1	6	3	9
Principal Deferrals | Business loans | Commercial borrower | International loans
Financing Receivable, Modifications [Line Items]
Balance		2	1	2	1
Subsequent default during period		0	0	0	0
Principal Deferrals | Business loans | Real estate | Commercial borrower | Domestic loans
Financing Receivable, Modifications [Line Items]
Balance		16	14	16	14
Subsequent default during period		0	4	1	4
Principal Deferrals | Business loans | Real estate | Commercial borrower | Domestic loans | Commercial Real Estate business line
Financing Receivable, Modifications [Line Items]
Balance	[1]	9	4	9	4
Subsequent default during period	[1]	0	0	0	0
Principal Deferrals | Business loans | Real estate | Commercial borrower | Domestic loans | Other business lines
Financing Receivable, Modifications [Line Items]
Balance	[2]	7	10	7	10
Subsequent default during period	[2]	0	4	1	4
Principal Deferrals | Retail loans
Financing Receivable, Modifications [Line Items]
Balance		19	4	19	4
Subsequent default during period		0	0	0	0
Principal Deferrals | Retail loans | Home equity | Consumer borrower
Financing Receivable, Modifications [Line Items]
Balance	[3]	1	2	1	2
Subsequent default during period		0	0	0	0
Principal Deferrals | Retail loans | Real estate
Financing Receivable, Modifications [Line Items]
Balance	[3]	18	2	18	2
Subsequent default during period		0	0	0	0
Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance		2	3	2	3
Subsequent default during period		$ 0	$ 0	$ 0	$ 0
[1]	Primarily loans to real estate developers.
[2]	Primarily loans secured by owner-occupied real estate.
[3]	Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.

Credit Quality And Allowance 54

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

Credit Quality And Allowance 55

Credit Quality And Allowance For Credit Losses (Accretable Yield For Acquired Purchased Credit-Impaired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Credit Quality And Allowance For Credit Losses [Abstract]
Balance at beginning of period	$ 1	$ 6	$ 1	$ 15
Reclassifications from nonaccretable	1	1	2	10
Accretion	(1)	(1)	(2)	(19)
Balance at end of period	$ 1	$ 6	$ 1	$ 6

Derivative And Credit-Related56

Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair value of securities pledged as collateral for derivative assets	$ 143		$ 143
Cash received as collateral for derivative assets	342		342
Derivative Liability, Fair Value of Collateral	12		12
Cash posted as collateral for derivative liabilities	6		6
Aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position	5		5
Collateral Already Posted, Aggregate Fair Value	1		1
Additional Collateral, Aggregate Fair Value	4		4
Net interest income generated by risk management fair value interest rate swaps	18	$ 18	52	$ 54
Net gain (loss) on interest rate fair value hedge ineffectiveness	3	$ (1)	2	$ (1)
Gain (loss) on foreign currency derivatives used as economic hedges	1		1
Gain (loss) on foreign currency derivatives used as economic hedges		an insignificant amount		an insignificant amount
Net gain on foreign currency positions	0	$ 1	1	$ 1
Allowance for credit losses on lending-related commitments	48		48		$ 41
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit	34		34		30
Risk participation agreements covering standby and commercial letters of credit	295		295		316
Standby and commercial letters of credit	4,100		4,100		4,000
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities	54		54		55
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities	40		40		44
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit	14		14		11
Notional amount of derivative credit risk participation agreements	653		653		598
Maximum estimated exposure to credit risk participation agreements assuming 100% default	12		$ 12		7
Weighted average remaining maturity of credit risk participation agreements, in years			2 years 5 months 1 day
Fair value of derivative liability	$ 640		$ 640		661
Visa derivative contract
Notional amount of the derivative contract equivalent to Visa Class B shares	780		780
Fair value of derivative liability	$ 1		$ 1		$ 1

Derivative And Credit-Related57

Derivative And Credit-Related Financial Instruments (Schedule Of Derivative Instruments) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	$ 21,356	$ 21,562
Fair Value of Gross Derivative Assets		885	894
Fair Value of Gross Derivative Liabilities		640	661
Derivative Asset, Netting Adjustment - Offsetting Liabilities		(123)	(133)
Derivative Liability, Netting Adjustment - Offsetting Assets		(123)	(133)
Derivative Asset, Netting Adjustment - Cash Collateral Received		(282)	(262)
Derivative Liability, Netting Adjustment, Cash Collateral Posted		(6)	0
Net Derivative Assets Included in the Consolidated Balance Sheets	[2]	480	499
Net Derivative Liabilities Included in the Consolidated Balance Sheets	[2]	511	528
Derivative Asset, Securities Pledged As Collateral		(141)	(239)
Derivative Liability, Securities Pledged As Collateral		(12)	(2)
Net Derivative Assets After Deducting Amounts Not Offset in the Consolidated Balance Sheets		339	260
Net Derivative Liabilities After Deducting Amounts Not Offset in the Consolidated Balance Sheets		499	526
Derivative Credit Risk Valuation Adjustment, Derivative Assets		5	2
Risk Management Purposes
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	3,157	2,308
Fair Value of Gross Derivative Assets		187	179
Fair Value of Gross Derivative Liabilities		1	0
Risk Management Purposes | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,525	1,800
Fair Value of Gross Derivative Assets		186	175
Fair Value of Gross Derivative Liabilities		0	0
Risk Management Purposes | Derivatives Used As Economic Hedges | Foreign Exchange Spot Forward And Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	632	508
Fair Value of Gross Derivative Assets		1	4
Fair Value of Gross Derivative Liabilities		1	0
Customer-Initiated And Other Activities
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	18,199	19,254
Fair Value of Gross Derivative Assets		698	715
Fair Value of Gross Derivative Liabilities		639	661
Customer-Initiated And Other Activities | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	12,613	12,328
Fair Value of Gross Derivative Assets		189	153
Fair Value of Gross Derivative Liabilities		140	102
Customer-Initiated And Other Activities | Interest Rate Caps And Floors Written
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	270	274
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]	270	274
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]	12,073	11,780
Fair Value of Gross Derivative Assets		189	153
Fair Value of Gross Derivative Liabilities		140	102
Customer-Initiated And Other Activities | Energy Contracts
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	3,558	4,932
Fair Value of Gross Derivative Assets		459	527
Fair Value of Gross Derivative Liabilities		456	525
Customer-Initiated And Other Activities | Energy Caps and Floors Written
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	714	1,218
Fair Value of Gross Derivative Assets		0	0
Fair Value of Gross Derivative Liabilities		101	173
Customer-Initiated And Other Activities | Energy Caps and Floors Purchased
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	714	1,218
Fair Value of Gross Derivative Assets		101	173
Fair Value of Gross Derivative Liabilities		0	0
Customer-Initiated And Other Activities | Energy Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,130	2,496
Fair Value of Gross Derivative Assets		358	354
Fair Value of Gross Derivative Liabilities		355	352
Customer-Initiated And Other Activities | Foreign Exchange Spot, Forwards, Options and Swaps
Derivatives, Fair Value [Line Items]
Notional/Contract Amount	[1]	2,028	1,994
Fair Value of Gross Derivative Assets		50	35
Fair Value of Gross Derivative Liabilities		$ 43	$ 34
[1]	Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.
[2]	Net derivative assets are included in “accrued income and other assets” and net derivative liabilities are included in “accrued expenses and other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $5 million and $2 million at September 30, 2015 and December 31, 2014, respectively.

Derivative And Credit-Related58

Derivative And Credit-Related Financial Instruments (Schedule Of Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Notional Amount	[1]	$ 21,356	$ 21,562
Risk Management Purposes
Notional Amount	[1]	3,157	2,308
Long-term Debt | Swaps - Fair Value Hedge - Receive Fixed/Pay Floating | Risk Management Purposes | Interest Rate Swaps
Notional Amount		$ 2,525	$ 1,800
Weighted Average Remaining Maturity		5 years 3 months 30 days	4 years 7 months
Weighted Average Receive Rate		3.89%	4.54%
Weighted Average Pay Rate	[2]	1.00%	0.49%
[1]	Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.
[2]	Variable rates paid on receive fixed swaps are based on six-month LIBOR rates in effect at September 30, 2015 and December 31, 2014.

Derivative And Credit-Related59

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	$ 14	$ 13	$ 40	$ 41
Interest Rate Contracts | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	4	3	11	11
Energy Contracts | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	1	1	2	1
Foreign Exchange Contracts | Foreign Exchange Income
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	$ 9	$ 9	$ 27	$ 29

Derivative And Credit-Related60

Derivative And Credit-Related Financial Instruments (Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	$ 29,263	$ 30,056
Commercial And Other | Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	26,887	27,905
Bankcard, Revolving Check Credit And Home Equity Loan Commitments | Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	2,376	2,151
Standby Letters Of Credit
Loss contingency, range of possible loss, maximum	3,993	3,880
Commercial Letters Of Credit
Loss contingency, range of possible loss, maximum	59	75
Other Credit-Related Financial Instruments
Loss contingency, estimate of possible loss	$ 1	$ 1

Derivative And Credit-Related61

Derivative And Credit-Related Financial Instruments (Summary Of Internally Classified Watch List Letters Of Credit) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Total criticized standby and commercial letters of credit	$ 104	$ 79
As a percentage of total outstanding standby and commercial letters of credit	2.60%	2.00%

Variable Interest Entities (V62

Variable Interest Entities (VIEs) (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Variable Interest Entity
Unfunded commitments to fund tax credit entities	$ 126
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	383
Other Tax Credit Entities
Variable Interest Entity
Exposure to loss as a result of involvement with VIEs	$ 10

Variable Interest Entities (V63

Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Variable Interest Entity
Other noninterest income	$ 26	$ 31	$ 80	$ 94
Provision for income taxes	63	73	188	207
Variable Interest Entity
Variable Interest Entity
Other noninterest income	0	(2)	1	(5)
Provision for income taxes, amortization of LIHTC investments	15	15	45	43
Provision for income taxes	(5)	(6)	(15)	(19)
Low income housing tax credits | Variable Interest Entity
Variable Interest Entity
Provision for income taxes, affordable housing tax credits and other tax benefits	(15)	(15)	(45)	(43)
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	$ (5)	$ (6)	$ (15)	$ (19)

Medium- And Long-Term Debt (Nar

Medium- And Long-Term Debt (Narrative) (Details) - Subsidiaries - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Debt Instrument [Line Items]
Blanket lien on real estate-related loans securing FHLB advances	$ 14,000
Potential FHLB borrowing capacity	6,000
4.00% subordinated notes due 2025
Debt Instrument [Line Items]
Notes issued	$ 350
Stated interest rate	4.00%
2.50% notes due 2020
Debt Instrument [Line Items]
Notes issued	$ 175	$ 500
Stated interest rate	2.50%	2.50%

Medium- And Long-Term Debt (Sch

Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($) $ in Millions		9 Months Ended		12 Months Ended
		Sep. 30, 2015		Dec. 31, 2014	Jun. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Total medium- and long-term debt		$ 3,100		$ 2,675
Parent Company
Debt Instrument [Line Items]
Total medium- and long-term debt		618		1,208
Subsidiaries
Debt Instrument [Line Items]
Subordinated notes		1,786		1,445
Total medium- and long-term debt		2,482		1,467
4.80% subordinated notes due 2015 | Parent Company
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 0		$ 304
Stated interest rate		4.80%		4.80%
Maturity Date		May 1, 2015		May 1, 2015
3.80% subordinated notes due 2026 | Parent Company
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 264		$ 257
Stated interest rate		3.80%		3.80%
Maturity Date		Jul. 22, 2026		Jul. 22, 2026
3.00% notes due 2015 | Parent Company
Debt Instrument [Line Items]
Medium-term notes		$ 0		$ 300
Stated interest rate		3.00%		3.00%
Maturity Date		Sep. 16, 2015		Sep. 16, 2015
2.125% notes due 2019 | Parent Company
Debt Instrument [Line Items]
Medium-term notes	[1]	$ 354		$ 347
Stated interest rate		2.125%		2.125%
Maturity Date		May 23, 2019		May 23, 2019
5.75% subordinated notes due 2016 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1],[2]	$ 662		$ 670
Par value swapped to variable rate		250
Total par value outstanding		$ 600
Stated interest rate		5.75%		5.75%
Maturity Date		Nov. 21, 2016		Nov. 21, 2016
5.20% subordinated notes due 2017 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 538		$ 548
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]	$ 358				$ 0
Total par value outstanding		$ 350
Stated interest rate		4.00%
Maturity Date		Jul. 27, 2025
7.875% subordinated notes due 2026 | Subsidiaries
Debt Instrument [Line Items]
Subordinated notes	[1]	$ 228		$ 227
Stated interest rate		7.875%		7.875%
Maturity Date		Sep. 15, 2026		Sep. 15, 2026
2.50% notes due 2020 | Subsidiaries
Debt Instrument [Line Items]
Medium-term notes		$ 680	[1]			$ 0
Total par value outstanding		$ 175			$ 500
Stated interest rate		2.50%			2.50%
Maturity Date		Jun. 2, 2020
6.0% - 6.4% fixed-rate notes due 2020 | Subsidiaries
Debt Instrument [Line Items]
Other notes		$ 16		$ 22
Fixed Interest Rate - minimum		6.00%		6.00%
Fixed Interest Rate - maximum		6.40%		6.40%
Maturity Date		Jun. 30, 2020		Jun. 30, 2020
[1]	The 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. The remaining amount is not swapped.

Accumulated Other Comprehensi66

Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Investment securities, Balance at beginning of period, net of tax	$ 37	$ (68)
Investment securities, Net unrealized holding gains arising during the period	44	85
Investment securities, Provision for income taxes	16	30
Investment securities, Net unrealized holding gains arising during period, net of tax	28	55
Investment securities, Net realized (losses) gains included in net securities (losses) gains	(2)	1
Investment securities, Benefit for income taxes	(1)	0
Investment securities, Reclassification adjustment for net securities (losses) gains included in net income, net of tax	(1)	1
Investment securities, Net losses realized as a yield adjustment in interest on investment securities	(6)	0
Investment securities, Benefit for income taxes	(2)	0
Investment Securities, Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax	(4)	0
Investment securities, Change in net unrealized (losses) gains on investment securities available-for-sale, net of tax	33	54
Investment securities, Balance at end of period, net of tax	70	(14)
Benefit plans, Balance at beginning of period, net of tax	(449)	(323)
Amortization of actuarial net loss	53	30
Amortization of prior service cost	0	1
Benefit plans, Amounts recognized in salaries and benefits expense	53	31
Benefit plans, Provision for income taxes	19	11
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax	34	20
Benefit plans, Balance at end of period, net of tax	(415)	(303)
Total accumulated other comprehensive loss at end of period, net of tax	$ (345)	$ (317)	$ (412)

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 136	$ 154	$ 405	$ 444
Income allocated to participating securities	2	2	5	6
Net income attributable to common shares	$ 134	$ 152	$ 400	$ 438
Basic average common shares	176	179	176	179
Basic net income per common share	$ 0.76	$ 0.85	$ 2.27	$ 2.44
Basic average common shares	176	179	176	179
Net effect of the assumed exercise of stock options	2	2	2	2
Net effect of the assumed exercise of warrants	3	4	4	5
Diluted average common shares	181	185	182	186
Diluted net income per common share	$ 0.74	$ 0.82	$ 2.20	$ 2.35

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding options	4.6	6	5.4	7.3
Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Range of exercise prices	$ 46.68	$ 50.87	$ 46.68	$ 48.17
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Range of exercise prices	$ 60.82	$ 60.82	$ 60.82	$ 61.94

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Net periodic defined benefit cost			$ 34	$ 29
Qualified Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 7	27	22
Interest cost	22	22	66	66
Expected return on plan assets	(40)	(33)	(120)	(99)
Amortization of prior service cost (credit)	1	1	3	4
Amortization of net loss	15	9	44	24
Net periodic defined benefit cost	7	6	20	17
Non-Qualified Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	3	3
Interest cost	2	2	7	7
Amortization of prior service cost (credit)	(1)	(1)	(3)	(3)
Amortization of net loss	3	2	8	5
Net periodic defined benefit cost	5	4	15	12
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	0	2	2
Expected return on plan assets	(1)	(1)	(3)	(3)
Amortization of net loss	0	1	1	1
Net periodic defined benefit cost	$ 0	$ 0	$ 0	$ 0

Income Taxes And Tax-Related 70

Income Taxes And Tax-Related Items Income Taxes And Tax-Related Items (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 22	$ 14
Reasonably possible decrease in unrecognized tax benefits in next 12 months	8
Tax-related interest and penalties payable	3	2
Net deferred tax assets	132	130
Valuation allowance for deferred tax assets	$ 0	$ 0

Contingent Liabilities (Narrati

Contingent Liabilities (Narrative) (Details) - USD ($)	Jan. 17, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Loss Contingencies [Line Items]
Legal fees		$ 5,000,000	$ 8,000,000	$ 15,000,000	$ 18,000,000
Pending Litigation
Loss Contingencies [Line Items]
Minimum amount of reasonably possible losses		0		0
Estimated maximum amount of reasonably possible losses		$ 32,000,000		$ 32,000,000
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)	9 Months Ended
	Sep. 30, 2015segmentsmarkets
Segment Reporting [Abstract]
Number of Major Business Segments | segments	3
Number of Primary Market Segments	3

Business Segment Information (B

Business Segment Information (Business Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net interest income (expense) (FTE)		$ 423	$ 415	$ 1,259	$ 1,243
Provision for credit losses		26	5	87	25
Noninterest income		264	215	780	643
Noninterest expenses		461	397	1,356	1,207
Provision (benefit) for income taxes (FTE)		64	74	191	210
Net income (loss)		136	154	405	444
Net loan charge-offs (recoveries)		23	3	49	24
Assets, average		71,333	66,398	69,688	65,335
Loans, average		48,972	47,159	48,655	46,327
Deposits, average		$ 59,140	$ 55,163	$ 57,851	$ 53,781
Return on average assets	[1],[2]	0.76%	0.93%	0.78%	0.91%
Efficiency ratio	[3],[4]	67.08%	62.87%	66.41%	63.99%
Business Bank
Net interest income (expense) (FTE)		$ 380	$ 376	$ 1,123	$ 1,120
Provision for credit losses		30	(4)	115	48
Noninterest income		145	97	427	288
Noninterest expenses		202	152	578	440
Provision (benefit) for income taxes (FTE)		99	114	292	314
Net income (loss)		194	211	565	606
Net loan charge-offs (recoveries)		23	(2)	54	18
Assets, average		39,210	37,751	39,002	36,936
Loans, average		38,113	36,746	37,950	35,964
Deposits, average		$ 31,397	$ 28,815	$ 30,594	$ 27,727
Return on average assets	[1]	1.98%	2.24%	1.93%	2.19%
Efficiency ratio	[3]	38.41%	32.12%	37.27%	31.28%
Retail Bank
Net interest income (expense) (FTE)		$ 158	$ 153	$ 466	$ 454
Provision for credit losses		2	0	(14)	(5)
Noninterest income		49	42	137	124
Noninterest expenses		185	185	542	533
Provision (benefit) for income taxes (FTE)		7	3	26	17
Net income (loss)		13	7	49	33
Net loan charge-offs (recoveries)		1	0	3	6
Assets, average		6,518	6,273	6,449	6,241
Loans, average		5,835	5,605	5,767	5,572
Deposits, average		$ 23,079	$ 22,042	$ 22,746	$ 21,854
Return on average assets	[1]	0.23%	0.12%	0.28%	0.20%
Efficiency ratio	[3]	89.33%	94.64%	89.91%	92.03%
Wealth Management
Net interest income (expense) (FTE)		$ 45	$ 45	$ 133	$ 135
Provision for credit losses		(3)	7	(12)	(11)
Noninterest income		59	59	177	181
Noninterest expenses		74	78	225	231
Provision (benefit) for income taxes (FTE)		12	7	34	34
Net income (loss)		21	12	63	62
Net loan charge-offs (recoveries)		(1)	5	(8)	0
Assets, average		5,228	4,998	5,137	4,972
Loans, average		5,024	4,808	4,938	4,791
Deposits, average		$ 4,188	$ 3,924	$ 4,082	$ 3,708
Return on average assets	[1]	1.62%	0.98%	1.64%	1.65%
Efficiency ratio	[3]	71.11%	75.00%	71.97%	73.40%
Finance
Net interest income (expense) (FTE)		$ (162)	$ (166)	$ (470)	$ (485)
Provision for credit losses		0	0	0	0
Noninterest income		15	15	42	44
Noninterest expenses		2	(29)	7	(24)
Provision (benefit) for income taxes (FTE)		(56)	(49)	(162)	(160)
Net income (loss)		(93)	(73)	(273)	(257)
Net loan charge-offs (recoveries)		0	0	0	0
Assets, average		12,177	11,023	12,013	11,069
Loans, average		0	0	0	0
Deposits, average		212	128	159	246
Other
Net interest income (expense) (FTE)		2	7	7	19
Provision for credit losses		(3)	2	(2)	(7)
Noninterest income		(4)	2	(3)	6
Noninterest expenses		(2)	11	4	27
Provision (benefit) for income taxes (FTE)		2	(1)	1	5
Net income (loss)		1	(3)	1	0
Net loan charge-offs (recoveries)		0	0	0	0
Assets, average		8,200	6,353	7,087	6,117
Loans, average		0	0	0	0
Deposits, average		$ 264	$ 254	$ 270	$ 246
[1]	Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.
[2]	Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.
[3]	Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.
[4]	Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

Business Segment Information (M

Business Segment Information (Market Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net interest income (expense) (FTE)		$ 423	$ 415	$ 1,259	$ 1,243
Provision for credit losses		26	5	87	25
Noninterest income		264	215	780	643
Noninterest expenses		461	397	1,356	1,207
Provision (benefit) for income taxes (FTE)		64	74	191	210
Net income (loss)		136	154	405	444
Net loan charge-offs (recoveries)		23	3	49	24
Assets, average		71,333	66,398	69,688	65,335
Loans, average		48,972	47,159	48,655	46,327
Deposits, average		$ 59,140	$ 55,163	$ 57,851	$ 53,781
Return on average assets	[1],[2]	0.76%	0.93%	0.78%	0.91%
Efficiency ratio	[3],[4]	67.08%	62.87%	66.41%	63.99%
Michigan
Net interest income (expense) (FTE)		$ 180	$ 179	$ 537	$ 544
Provision for credit losses		6	(8)	(15)	(13)
Noninterest income		85	83	251	256
Noninterest expenses		152	166	436	486
Provision (benefit) for income taxes (FTE)		36	38	124	118
Net income (loss)		71	66	243	209
Net loan charge-offs (recoveries)		9	3	10	13
Assets, average		13,856	13,724	13,815	13,797
Loans, average		13,223	13,248	13,245	13,400
Deposits, average		$ 21,946	$ 21,214	$ 21,788	$ 20,853
Return on average assets	[2]	1.23%	1.19%	1.42%	1.27%
Efficiency ratio	[4]	57.49%	62.91%	55.27%	60.67%
California
Net interest income (expense) (FTE)		$ 187	$ 182	$ 543	$ 531
Provision for credit losses		24	14	24	39
Noninterest income		38	37	112	110
Noninterest expenses		102	102	300	298
Provision (benefit) for income taxes (FTE)		37	40	124	115
Net income (loss)		62	63	207	189
Net loan charge-offs (recoveries)		10	6	16	21
Assets, average		17,060	15,768	16,741	15,543
Loans, average		16,789	15,509	16,473	15,259
Deposits, average		$ 18,372	$ 16,350	$ 17,500	$ 15,506
Return on average assets	[2]	1.27%	1.47%	1.48%	1.53%
Efficiency ratio	[4]	45.28%	46.49%	45.88%	46.57%
Texas
Net interest income (expense) (FTE)		$ 129	$ 130	$ 390	$ 403
Provision for credit losses		10	3	74	32
Noninterest income		34	36	101	104
Noninterest expenses		97	96	287	275
Provision (benefit) for income taxes (FTE)		20	25	48	72
Net income (loss)		36	42	82	128
Net loan charge-offs (recoveries)		4	0	12	7
Assets, average		11,578	11,835	11,881	11,525
Loans, average		10,997	11,147	11,260	10,829
Deposits, average		$ 10,753	$ 10,633	$ 10,907	$ 10,743
Return on average assets	[2]	1.16%	1.40%	0.88%	1.42%
Efficiency ratio	[4]	59.54%	57.91%	58.38%	54.13%
Other Markets
Net interest income (expense) (FTE)		$ 87	$ 83	$ 252	$ 231
Provision for credit losses		(11)	(6)	6	(26)
Noninterest income		96	42	277	123
Noninterest expenses		110	51	322	145
Provision (benefit) for income taxes (FTE)		25	21	56	60
Net income (loss)		59	59	145	175
Net loan charge-offs (recoveries)		0	(6)	11	(17)
Assets, average		8,462	7,695	8,151	7,284
Loans, average		7,963	7,255	7,677	6,839
Deposits, average		$ 7,593	$ 6,584	$ 7,227	$ 6,187
Return on average assets	[2]	2.82%	3.07%	2.38%	3.20%
Efficiency ratio	[4]	59.86%	41.46%	60.61%	41.16%
Finance & Other
Net interest income (expense) (FTE)		$ (160)	$ (159)	$ (463)	$ (466)
Provision for credit losses		(3)	2	(2)	(7)
Noninterest income		11	17	39	50
Noninterest expenses		0	(18)	11	3
Provision (benefit) for income taxes (FTE)		(54)	(50)	(161)	(155)
Net income (loss)		(92)	(76)	(272)	(257)
Net loan charge-offs (recoveries)		0	0	0	0
Assets, average		20,377	17,376	19,100	17,186
Loans, average		0	0	0	0
Deposits, average		$ 476	$ 382	$ 429	$ 492
[1]	Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.
[2]	Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.
[3]	Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.
[4]	Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details) - 2.50% Senior Notes Due 2020 - Subsidiaries - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Subsequent Event [Line Items]
Notes issued	$ 175	$ 500
Stated interest rate	2.50%	2.50%