10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2017

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

COMMISSION FILE NUMBER 001-12307

ZIONS BANCORPORATION

(Exact name of registrant as specified in its charter)

UTAH	87-0227400
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
One South Main, 15th Floor Salt Lake City, Utah	84133
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (801) 844-7637

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨
		Emerging growth company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Common Stock, without par value, outstanding at October 31, 2017 199,743,776 shares

ZIONS BANCORPORATION AND SUBSIDIARIES

Table of Contents

		Page
PART  I. FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)	42
	Consolidated Balance Sheets	42
	Consolidated Statements of Income	43
	Consolidated Statements of Comprehensive Income	44
	Consolidated Statements of Changes in Shareholders’ Equity	45
	Consolidated Statements of Cash Flows	46
	Notes to Consolidated Financial Statements	47
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	3
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	80
Item 4.	Controls and Procedures	80
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	80
Item 1A.	Risk Factors	81
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	81
Item 6.	Exhibits	82
Signatures		83

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ZIONS BANCORPORATION AND SUBSIDIARIES

PART I. FINANCIAL INFORMATION

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

FORWARD-LOOKING INFORMATION

Statements in this Quarterly Report on Form 10-Q that are based on other than historical data are forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements provide current expectations or forecasts of future events and include, among others:

• statements with respect to the beliefs, plans, objectives, goals, targets, commitments, designs, guidelines, expectations, anticipations, and future financial condition, results of operations and performance of Zions Bancorporation (“the Parent”) and its subsidiaries (collectively “the Company,” “Zions,” “we,” “our,” “us”); and

• statements preceded by, followed by, or that include the words “may,” “could,” “should,” “would,” “believe,” “anticipate,” “estimate,” “expect,” “intend,” “target,” “commit,” “design,” “plan,” “projects,” or similar expressions.

These forward-looking statements are not guarantees of future performance, nor should they be relied upon as representing management’s views as of any subsequent date. Forward-looking statements involve significant risks and uncertainties and actual results may differ materially from those presented, either expressed or implied, including, but not limited to, those presented in Management’s Discussion and Analysis. Factors that might cause such differences include, but are not limited to:

• the Company’s ability to successfully execute its business plans, manage its risks, and achieve its objectives, including its restructuring and efficiency initiatives;

• changes in local, national and international political and economic conditions, including without limitation the political and economic effects of the economic and fiscal imbalances in the United States and other countries, potential or actual downgrades in ratings of sovereign debt issued by the United States and other countries, and other major developments, including wars, military actions, and terrorist attacks;

• changes in financial and commodity market prices and conditions, either internationally, nationally or locally in areas in which the Company conducts its operations, including without limitation rates of business formation and growth, commercial and residential real estate development, real estate prices, and oil and gas-related commodity prices;

• changes in markets for equity, fixed income, commercial paper and other securities, commodities, including availability, market liquidity levels, and pricing;

• any impairment of our goodwill or other intangibles, or any adjustment of valuation allowances on our deferred tax assets due to adverse changes in the economic environment, declining operations of the reporting unit, or a change to the corporate statutory tax rate or other similar changes if and as implemented by local and national governments, or other factors;

• changes in interest rates, the quality and composition of the loan and securities portfolios, demand for loan products, deposit flows and competition;

• acquisitions and integration of acquired businesses;

• increases in the levels of losses, customer bankruptcies, bank failures, claims, and assessments;

• changes in fiscal, monetary, regulatory, trade and tax policies and laws, and regulatory assessments and fees, including policies of the U.S. Department of Treasury, the OCC, the Board of Governors of the Federal Reserve Board System, the FDIC, the SEC, and the CFPB; 

• the impact of executive compensation rules under the Dodd-Frank Act and banking regulations which may impact the ability of the Company and other American financial institutions to retain and recruit executives and other personnel necessary for their businesses and competitiveness;

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• the impact of the Dodd-Frank Act and Basel III, and rules and regulations thereunder, on our required regulatory capital and liquidity levels, governmental assessments on us (including, but not limited to, the Federal Reserve reviews of our annual capital plan), the scope of business activities in which we may engage, the manner in which we engage in such activities, the fees we may charge for certain products and services, and other matters affected by the Dodd-Frank Act and these international standards;

• continuing consolidation in the financial services industry;

• new legal claims against the Company, including litigation, arbitration and proceedings brought by governmental or self-regulatory agencies, or changes in existing legal matters;

• success in gaining regulatory approvals, when required;

• changes in consumer spending and savings habits;

• increased competitive challenges and expanding product and pricing pressures among financial institutions;

• inflation and deflation;

• technological changes and the Company’s implementation of new technologies;

• the Company’s ability to develop and maintain secure and reliable information technology systems;

• legislation or regulatory changes which adversely affect the Company’s operations or business;

• the Company’s ability to comply with applicable laws and regulations;

• changes in accounting policies or procedures as may be required by the FASB or regulatory agencies; and

• costs of deposit insurance and changes with respect to FDIC insurance coverage levels.

Except to the extent required by law, the Company specifically disclaims any obligation to update any factors or to publicly announce the result of revisions to any of the forward-looking statements included herein to reflect future events or developments.

GLOSSARY OF ACRONYMS

ACL	Allowance for Credit Losses	CSV	Cash Surrender Value
AFS	Available-for-Sale	DFAST	Dodd-Frank Act Stress Test
ALCO	Asset/Liability Committee	Dodd-Frank Act	Dodd-Frank Wall Street Reform and Consumer Protection Act
ALLL	Allowance for Loan and Lease Losses	DTA	Deferred Tax Asset
Amegy	Amegy Bank, a division of ZB, N.A.	EaR	Earnings at Risk
AOCI	Accumulated Other Comprehensive Income	EITF	Emerging Issues Task Force
ASC	Accounting Standards Codification	ERM	Enterprise Risk Management
ASU	Accounting Standards Update	ERMC	Enterprise Risk Management Committee
BHC	Bank Holding Company	EVE	Economic Value of Equity at Risk
BOLI	Bank-Owned Life Insurance	FAMC	Federal Agricultural Mortgage Corporation, or “Farmer Mac”
bps	basis points	FASB	Financial Accounting Standards Board
CB&T	California Bank & Trust, a division of ZB, N.A.	FDIC	Federal Deposit Insurance Corporation
CCAR	Comprehensive Capital Analysis and Review	FDICIA	Federal Deposit Insurance Corporation Improvement Act
CD	Certificate of Deposit	FHLB	Federal Home Loan Bank
CET1	Common Equity Tier 1 (Basel III)	FHLMC	Federal Home Loan Mortgage Corporation, or “Freddie Mac”
CFPB	Consumer Financial Protection Bureau	FRB	Federal Reserve Board
CLTV	Combined Loan-to-Value Ratio	FTP	Funds Transfer Pricing
CMC	Capital Management Committee	GAAP	Generally Accepted Accounting Principles
COSO	Committee of Sponsoring Organizations of the Treadway Commission	HCR	Horizontal Capital Review
CRA	Community Reinvestment Act	HECL	Home Equity Credit Line
CRE	Commercial Real Estate	HQLA	High-Quality Liquid Assets
CSA	Credit Support Annex	HTM	Held-to-Maturity

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IFRS	International Financial Reporting Standards	PEI	Private Equity Investment
LCR	Liquidity Coverage Ratio	PPNR	Pre-provision Net Revenue
LIBOR	London Interbank Offered Rate	ROC	Risk Oversight Committee
MD&A	Management’s Discussion and Analysis	RSU	Restricted Stock Unit
NAV	Net Asset Value	RULC	Reserve for Unfunded Lending Commitments
NBAZ	National Bank of Arizona, a division of ZB, N.A.	S&P	Standard and Poor's
NIM	Net Interest Margin	SBA	Small Business Administration
NM	Not Meaningful	SBIC	Small Business Investment Company
NRE	National Real Estate	SEC	Securities and Exchange Commission
NSB	Nevada State Bank, a division of ZB, N.A.	SNC	Shared National Credit
NSFR	Net Stable Funding Ratio	TCBO	The Commerce Bank of Oregon, a division of ZB, N.A.
OCC	Office of the Comptroller of the Currency	TCBW	The Commerce Bank of Washington, a division of ZB, N.A.
OCI	Other Comprehensive Income	TDR	Troubled Debt Restructuring
OREO	Other Real Estate Owned	Vectra	Vectra Bank Colorado, a division of ZB, N.A.
OTTI	Other-Than-Temporary Impairment	ZB, N.A.	ZB, National Association
Parent	Zions Bancorporation	Zions Bank	Zions Bank, a division of ZB, N.A.
PCI	Purchased Credit-Impaired	ZMSC	Zions Management Services Company

CRITICAL ACCOUNTING POLICIES AND SIGNIFICANT ESTIMATES

The Company has made no significant changes in its critical accounting policies and significant estimates from those disclosed in its 2016 Annual Report on Form 10-K.

GAAP to NON-GAAP RECONCILIATIONS

This Form 10-Q presents non-GAAP financial measures, in addition to GAAP financial measures, to provide investors with additional information. The adjustments to reconcile from the applicable GAAP financial measures to the non-GAAP financial measures are presented in the following schedules. The Company considers these adjustments to be relevant to ongoing operating results and provide a meaningful base for period-to-period and company-to-company comparisons. These non-GAAP financial measures are used by management to assess the performance and financial position of the Company and for presentations of Company performance to investors. The Company further believes that presenting these non-GAAP financial measures will permit investors to assess the performance of the Company on the same basis as that applied by management.

Non-GAAP financial measures have inherent limitations, and are not required to be uniformly applied by individual entities. Although non-GAAP financial measures are frequently used by stakeholders to evaluate a company, they have limitations as an analytical tool and should not be considered in isolation or as a substitute for analysis of results reported under GAAP.

The following are the non-GAAP financial measures presented in this Form 10-Q and a discussion of why management uses these non-GAAP measures:

Return on Average Tangible Common Equity – this schedule also includes “net earnings applicable to common shareholders, excluding the effects of the adjustments, net of tax” and “average tangible common equity.” Return on average tangible common equity is a non-GAAP financial measure that management believes provides useful information about the Company’s use of shareholders’ equity. Management believes the use of ratios that utilize tangible equity provides additional useful information because they present measures of those assets that can generate income.

Tangible Equity Ratio, Tangible Common Equity Ratio, and Tangible Book Value per Common Share – this schedule also includes “tangible equity,” “tangible common equity,” and “tangible assets.” Tangible equity ratio, tangible common equity ratio, and tangible book value per common share are non-GAAP financial measures that management believes provides additional useful information about the levels of tangible assets and tangible equity between each other and in relation to outstanding shares of common stock. Management believes the use

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of ratios that utilize tangible equity provides additional useful information because they present measures of those assets that can generate income.

Efficiency Ratio – this schedule also includes “adjusted noninterest expense,” “taxable-equivalent net interest income,” “adjusted taxable-equivalent revenue,” and “adjusted pre-provision net revenue (“PPNR”).” The methodology of determining the efficiency ratio may differ among companies. Management makes adjustments to exclude certain items as identified in the subsequent schedule which it believes allows for more consistent comparability among periods. Management believes the efficiency ratio provides useful information regarding the cost of generating revenue. Adjusted noninterest expense provides a measure as to how well the Company is managing its expenses, and adjusted PPNR enables management and others to assess the Company’s ability to generate capital to cover credit losses through a credit cycle. Taxable-equivalent net interest income allows management to assess the comparability of revenue arising from both taxable and tax-exempt sources. The efficiency ratio and adjusted noninterest expense are the key metrics to which the Company announced it would hold itself accountable in its June 1, 2015 efficiency initiative, and to which executive compensation is tied.

RETURN ON AVERAGE TANGIBLE COMMON EQUITY (NON-GAAP)

		Three Months Ended
(Dollar amounts in millions)		September 30, 2017			June 30, 2017			March 31, 2017			September 30, 2016
Net earnings applicable to common shareholders (GAAP)		$	152		$	154		$	129		$	117
Adjustment, net of tax:
Amortization of core deposit and other intangibles		1			1			1			1
Net earnings applicable to common shareholders, excluding the effects of the adjustment, net of tax (non-GAAP)	(a)	$	153		$	155		$	130		$	118
Average common equity (GAAP)		$	7,230		$	7,143		$	6,996		$	6,986
Average goodwill		(1,014		)	(1,014		)	(1,014		)	(1,014		)
Average core deposit and other intangibles		(4		)	(6		)	(8		)	(11		)
Average tangible common equity (non-GAAP)	(b)	$	6,212		$	6,123		$	5,974		$	5,961
Number of days in quarter	(c)	92			91			90			92
Number of days in year	(d)	365			365			365			366
Return on average tangible common equity (non-GAAP)	(a/b/c)*d	9.8		%	10.2		%	8.8		%	7.9		%

TANGIBLE EQUITY (NON-GAAP) AND TANGIBLE COMMON EQUITY (NON-GAAP)

(Dollar amounts in millions, except per share amounts)		September 30, 2017			June 30, 2017			March 31, 2017			September 30, 2016
Total shareholders’ equity (GAAP)		$	7,761		$	7,749		$	7,730		$	7,679
Goodwill		(1,014		)	(1,014		)	(1,014		)	(1,014		)
Core deposit and other intangibles		(3		)	(5		)	(7		)	(10		)
Tangible equity (non-GAAP)	(a)	6,744			6,730			6,709			6,655
Preferred stock		(566		)	(566		)	(710		)	(710		)
Tangible common equity (non-GAAP)	(b)	$	6,178		$	6,164		$	5,999		$	5,945
Total assets (GAAP)		$	65,564		$	65,446		$	65,463		$	61,039
Goodwill		(1,014		)	(1,014		)	(1,014		)	(1,014		)
Core deposit and other intangibles		(3		)	(5		)	(7		)	(10		)
Tangible assets (non-GAAP)	(c)	$	64,547		$	64,427		$	64,442		$	60,015
Common shares outstanding (thousands)	(d)	199,712			202,131			202,595			203,850
Tangible equity ratio (non-GAAP)	(a/c)	10.45		%	10.45		%	10.41		%	11.09		%
Tangible common equity ratio (non-GAAP)	(b/c)	9.57		%	9.57		%	9.31		%	9.91		%
Tangible book value per common share (non-GAAP)	(b/d)	$	30.93		$	30.50		$	29.61		$	29.16

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EFFICIENCY RATIO (NON-GAAP) AND ADJUSTED PRE-PROVISION NET REVENUE (NON-GAAP)

(Dollar amounts in millions)		Three Months Ended									Nine Months Ended						Year Ended
		September 30, 2017			June 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016			December 31, 2016
Noninterest expense (GAAP)	(a)	$	413		$	405		$	403		$	1,232		$	1,181		$	1,585
Adjustments:
Severance costs		1			—			—			6			4			5
Other real estate expense, net		(1		)	—			—			(1		)	(2		)	(2		)
Provision for unfunded lending commitments		(4		)	3			(3		)	(6		)	(13		)	(10		)
Amortization of core deposit and other intangibles		2			2			2			5			6			8
Restructuring costs		1			1			—			3			1			5
Total adjustments	(b)	(1		)	6			(1		)	7			(4		)	6
Adjusted noninterest expense (non-GAAP)	(a-b)= (c)	$	414		$	399		$	404		$	1,225		$	1,185		$	1,579
Net interest income (GAAP)	(d)	$	522		$	528		$	469		$	1,539		$	1,386		$	1,867
Fully taxable-equivalent adjustments		9			9			7			26			19			26
Taxable-equivalent net interest income (non-GAAP)1	(d+e)=f	531			537			476			1,565			1,405			1,893
Noninterest income (GAAP)	g	139			132			145			404			388			515
Combined income (non-GAAP)	(f+g)= (h)	670			669			621			1,969			1,793			2,408
Adjustments:
Fair value and nonhedge derivative income (loss)		—			—			—			(1		)	(5		)	2
Securities gains, net		5			2			8			13			11			7
Total adjustments	(i)	5			2			8			12			6			9
Adjusted taxable-equivalent revenue (non-GAAP)	(h-i)= (j)	$	665		$	667		$	613		$	1,957		$	1,787		$	2,399
Pre-provision net revenue	(h)-(a)	$	257		$	264		$	218		$	737		$	612		$	823
Adjusted PPNR (non-GAAP)	(j-c)	251			268			209			732			602			820
Efficiency ratio (non-GAAP)	(c/j)	62.3		%	59.8		%	65.9		%	62.6		%	66.3		%	65.8		%

RESULTS OF OPERATIONS

Executive Summary

Net earnings applicable to common shareholders for the third quarter of 2017 were $152 million, or $0.72 per diluted common share, compared with net earnings applicable to common shareholders of $154 million, or $0.73 per diluted common share for the second quarter of 2017, and $117 million, or $0.57 per diluted common share for the third quarter of 2016. Interest income of $557 million in the third quarter of 2017 improved $66 million over the same prior year period, mainly due to growth in our loans and securities portfolios and short-term rate increases that positively impacted loan yields. Net interest margin (“NIM”) was 3.45% in the most recent quarter, compared with 3.36% in the third quarter of 2016.

Performance Against Previously Announced Initiatives

In June 2015, we announced several initiatives to improve operational and financial performance along with some key financial targets. Our initiatives are designed to improve customer experience, to simplify the corporate structure and operations, and to make the Company a more efficient organization. Following is a brief discussion regarding current performance against these key financial targets.

• Achieve an efficiency ratio in the low 60% range for fiscal year 2017. Our efficiency ratio for the third quarter of 2017 was 62.3%, a 365 bps improvement over the same prior year period efficiency ratio of 65.9%. Our year-

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to-date efficiency ratio of 62.6% is also a large improvement over the same prior year period, which was 66.3%. Improvements in interest income from securities and loans, partially offset by increases in adjusted noninterest expense, resulted in the significant improvement. See “GAAP to Non-GAAP Reconciliations” on page 5 for more information regarding the calculation of the efficiency ratio and why management uses this non-GAAP measure.

• Maintain adjusted noninterest expense at less than $1.58 billion in 2016, with a modest increase of 2-3% in 2017. We met our target for fiscal year 2016, keeping adjusted noninterest expense to $1.579 billion. Through September 30, 2017, adjusted noninterest expense was $1.225 billion, compared with $1.185 billion for the same prior year period. In the most recent quarter, we incurred $6 million of non-recurring expenses due to Hurricane Harvey’s impact on the Houston area. Despite these additional expenses, our adjusted noninterest expense should increase by 2-3% in 2017.

Highlights from the Third Quarter and First Nine Months of 2017

Net interest income, which is more than three-quarters of our revenue, was $522 million in the third quarter of 2017 and $469 million in the third quarter of 2016. This 11.3% increase over the same prior year period is due to our efforts to change the mix of interest-earning assets from lower-yielding money market investments into higher-yielding investment securities and loans. Net interest margin was 3.45% in the third quarter of 2017, compared with 3.36% in the third quarter of 2016. Year-to-date net interest income was $1.5 billion in 2017 and $1.4 billion for the same prior year period. The 11.0% increase between the two periods was mainly impacted by growth in our loans and securities portfolios and short-term rate increases that positively impacted loan yields.

Adjusted PPNR of $251 million for the third quarter of 2017 was up $42 million, or 20.1%, from the third quarter of 2016, primarily as a result of increases in net interest income. Although adjusted noninterest expense also increased over the same period, from $404 million in the third quarter of 2016 to $414 million in the most recent quarter, increases in income more than offset the increase in expense. The higher adjusted PPNR in the third quarter of 2017, compared with the same prior year period, drove an improvement in the Company’s efficiency ratio from 65.9% in the third quarter of 2016 to 62.3% in the current quarter. Year-to-date adjusted PPNR was $732 million in 2017 and $602 million in 2016, representing a 21.6% increase. Increases were driven by similar factors to those previously discussed. See “GAAP to Non-GAAP Reconciliations” on page 5 for more information regarding the calculation of adjusted PPNR.

Asset quality for the total loan portfolio continues to strengthen. Classified and nonaccrual loans improved as a percentage of outstanding balances by 97 bps and 27 bps, respectively, between the third quarters of 2016 and 2017. In recent quarters, asset quality in our oil and gas-related portfolio has been substantially weaker than it has been in non-oil and gas-related loans. At the same time, the Company has reduced its oil and gas-related exposure by $253 million since the third quarter of 2016 and oil prices have stabilized since their low point in early 2016. Classified and nonaccrual balances in the oil and gas-related portfolio have decreased since the third quarter of 2016 by 35.8% and 39.6%, respectively. These improvements have been the drivers of a lower provision for credit losses, which was $1 million in the current quarter and $16 million in the same prior year period.

Loans have grown $1.6 billion, or 3.8% since the third quarter of 2016, despite targeted declines in certain areas due to portfolio and concentration risk management. Aside from declines in our national real estate (“NRE”), oil and gas-related, and commercial real estate (“CRE”) portfolios, this growth has been widespread across most other products, with particular strength in 1-4 family residential, commercial and industrial, and municipal lending.

We continue to increase the return on and of capital. Return on average tangible common equity was 9.8%, up 189 bps from the same prior year period. During the quarter, the Company repurchased 2.5 million shares of common stock under its 2017 capital plan (which spans the timeframe of July 2017 to June 2018). Dividends per common share were $0.12 in the third quarter of 2017, compared with $0.08 for the prior quarter and the same prior year period. In June 2017, we announced the Federal Reserve did not object to the Company’s 2017 capital plan. The plan included stepped quarterly common dividend increases, rising to $0.24 per share by the second quarter of 2018,

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and up to $465 million in common stock repurchases. See “Capital Management” on page 39 for more information regarding the 2017 capital plan.

Challenges in the Third Quarter and the First Nine Months of 2017

Noninterest expense increased to $413 million from $403 million for the same prior year period, representing a 2.5% increase, which is generally in line with announced forecasts. Incentive compensation expense was higher this quarter than in the same prior year period. These increases were partially offset by a decline in other noninterest expense primarily due to legal accruals that occurred in the third quarter of 2016. Adjusted noninterest expense, which excludes severance and some other items as explained in the “GAAP to Non-GAAP Reconciliations” section on page 5, increased 2.5% over the same period. We expect to achieve our goal of limiting adjusted noninterest expense growth to 2-3% in 2017 when compared with 2016.

Further impacting noninterest expense during the third quarter of 2017 was $6 million of noninterest expense related to property damage and community and employee support as a result of Hurricane Harvey. Additionally, we provided a $34 million qualitative increase in the allowance for credit losses (“ACL”) due to potential losses caused by the hurricane.

Net Interest Income

Net interest income is the difference between interest earned on interest-earning assets and interest paid on interest-bearing liabilities. Taxable-equivalent net interest income is the largest portion of our revenue. For the third quarter of 2017, taxable-equivalent net interest income was $531 million, compared with $537 million for the second quarter of 2017 and $476 million for the third quarter of 2016. The linked quarter decrease was primarily due to $16 million of interest income recoveries in the prior quarter, which did not repeat. Between the third quarters of 2016 and 2017, taxable-equivalent net interest income increased $55 million, which was driven by a larger securities portfolio, growth in the lending portfolio, and increases in short-term rates, which improved loan yields. We expect the size of the securities portfolio to be relatively stable during the next several quarters and we are not assuming any further increases in benchmark interest rates. Therefore, we expect net interest income to increase only moderately over the next twelve months.

Net interest margin and Interest Rate Spreads in 2017 vs. 2016

The NIM was 3.45% and 3.36% for the third quarters of 2017 and 2016, respectively, and 3.52% for the second quarter of 2017. The increased NIM for the third quarter, compared with the same prior year period, resulted from the combination of several factors. During 2016, we continued to make changes in asset mix, by moving funds from lower-yielding money market investments to purchase investment securities, coupled with our loan growth. The NIM was also positively impacted by increases in short-term interest rates. These factors have been somewhat offset because recently we have also used wholesale borrowings to fund some of the balance sheet growth. Average interest-earning assets increased $4.9 billion from the third quarter of 2016, with average rates improving 15 bps. Average interest-bearing liabilities increased $3.9 billion over the same period and average rates increased 12 bps.

The average loan portfolio increased $1.3 billion, or 3.2% between the third quarter of 2017 and the third quarter of 2016. Most of the average growth was in the consumer 1-4 family residential portfolio, where Company yields are generally lower than on commercial loans. The average loan yield increased 16 bps over the same period, with increases in the average rates for commercial, CRE, and consumer loans of 17 bps, 27 bps, and 5 bps, respectively. We have experienced some improvement in interest income in response to short-term rate increases. A portion of our variable-rate loans were not affected by changes in those indices due to interest rate floors, longer reset frequency, or indices tied to longer-term rates, which rates have been impacted by a flattening of the yield curve in recent quarters. We expect continued strong growth in residential mortgages, with moderate growth in both CRE and commercial and industrial loans.

Average available-for-sale (“AFS”) securities balances for the third quarter of 2017 increased by $5.5 billion compared with the same prior year period. Yields on average AFS securities increased by 30 bps over the same period.

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Average noninterest-bearing demand deposits provided us with low cost funding and comprised 45.8% of average total deposits, which totaled $51.9 billion, for the third quarter of 2017, compared with 44.3% of average total deposits, which totaled $50.7 billion, for the third quarter of 2016. Average interest-bearing deposits increased by 0.3% in the third quarter of 2017, compared with the same prior year period, and the average rate paid increased 3 bps.Over the past twelve months we have seen a deposit beta of approximately 3%, which is a relatively low value for the current environment. We have been selectively increasing deposit pricing in certain markets and with certain clients, but we have not generally experienced significant pressure to increase deposit rates.Although we consider a wide variety of sources when determining our funding needs, we benefit from access to deposits from a significant number of small to mid-sized business customers, particularly noninterest-bearing deposits, that provide us with a low cost of funds and have a positive impact on our NIM. Further detail on deposit betas is discussed in “Interest Rate and Market Risk Management” on page 30.

The average balance of long-term debt was $297 million lower for the third quarter of 2017 compared with the same prior year period, as a result of early calls and maturities. The average interest rate paid on long-term debt increased by 58 bps between the same periods because remaining debt was at a higher average rate than the debt that matured and was called. Average short-term borrowings increased $4.3 billion. Further changes in short-term borrowing will be driven by balancing changes in deposits and loans as we do not foresee significant increases in investment security balances.

The spread on average interest-bearing funds was 3.26% and 3.23% for the third quarters of 2017 and 2016, respectively. The spread on average interest-bearing funds for these periods was affected by the same factors that had an impact on the NIM.

Interest rate spreads and margin are impacted by the mix of assets we hold, the composition of our loan and securities portfolios and the type of funding we use. We expect some modest resistance to increased spreads due to both a change in the mix of the portfolio (increasing concentration in lower-yielding residential mortgages), as well as older, higher-yielding loans maturing or paying down and being replaced with new, lower-yielding loans. Generally, the new loans are of a higher credit quality than the maturing loans, which has resulted in lower-yielding loans.

Our estimates of the Company’s interest rate risk position are highly dependent upon a number of assumptions regarding the repricing behavior of various deposit and loan types in response to changes in both short-term and long-term interest rates, balance sheet composition, and other modeling assumptions, as well as the actions of competitors and customers in response to those changes. In addition, our modeled projections for noninterest-bearing demand deposits, which are a substantial portion of our deposit balances, are particularly reliant on assumptions for which there is little historical experience due to the prolonged period of very low interest rates. Further detail on interest rate risk is discussed in “Interest Rate and Market Risk Management” on page 30.

Refer to the “Liquidity Risk Management” section beginning on page 34 for more information on how we manage liquidity risk.

The following schedule summarizes the average balances, the amount of interest earned or incurred, and the applicable yields for interest-earning assets and the costs of interest-bearing liabilities that generate taxable-equivalent net interest income.

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CONSOLIDATED AVERAGE BALANCE SHEETS, YIELDS AND RATES

(Unaudited)

	Three Months Ended September 30, 2017							Three Months Ended September 30, 2016
(Dollar amounts in millions)	Average balance			Amount of interest 1		Average yield/rate		Average balance			Amount of interest 1		Average yield/rate
ASSETS
Money market investments	$	1,246		$	5	1.44	%	$	3,140		$	5	0.63	%
Securities:
Held-to-maturity	750			7		3.96		706			8		4.33
Available-for-sale	15,197			81		2.12		9,698			44		1.82
Trading account	43			—		3.73		80			1		3.34
Total securities 2	15,990			88		2.21		10,484			53		2.00
Loans held for sale	52			1		4.29		133			1		3.34
Loans and leases 3
Commercial	22,261			245		4.36		21,816			230		4.19
Commercial real estate	11,192			126		4.46		11,331			119		4.19
Consumer	10,379			101		3.86		9,340			89		3.81
Total loans and leases	43,832			472		4.27		42,487			438		4.11
Total interest-earning assets	61,120			566		3.67		56,244			497		3.52
Cash and due from banks	767							556
Allowance for loan losses	(540		)					(609		)
Goodwill	1,014							1,014
Core deposit and other intangibles	4							11
Other assets	2,974							2,846
Total assets	$	65,339						$	60,062
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest-bearing deposits:
Savings and money market	$	25,190		10		0.16	%	$	25,683		9		0.15	%
Time	2,933			5		0.70		2,409			3		0.51
Foreign	—			—		—		117			—		0.30
Total interest-bearing deposits	28,123			15		0.21		28,209			12		0.18
Borrowed funds:
Federal funds and other short-term borrowings	4,609			14		1.17		343			—		0.22
Long-term debt	383			6		5.71		680			9		5.13
Total borrowed funds	4,992			20		1.52		1,023			9		3.48
Total interest-bearing liabilities	33,115			35		0.41		29,232			21		0.29
Noninterest-bearing deposits	23,798							22,466
Other liabilities	630							668
Total liabilities	57,543							52,366
Shareholders’ equity:
Preferred equity	566							710
Common equity	7,230							6,986
Total shareholders’ equity	7,796							7,696
Total liabilities and shareholders’ equity	$	65,339						$	60,062
Spread on average interest-bearing funds						3.26	%						3.23	%
Taxable-equivalent net interest income and net yield on interest-earning assets				$	531	3.45	%				$	476	3.36	%

¹  Taxable-equivalent rates used where applicable.

²  Quarter-to-date interest on total securities includes $34 million and $29 million of premium amortization, as of September 30, 2017 and September 30, 2016, respectively.

³  Net of unearned income and fees, net of related costs. Loans include nonaccrual and restructured loans.

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	Nine Months Ended September 30, 2017							Nine Months Ended September 30, 2016
(Dollar amounts in millions)	Average balance			Amount of interest 1		Average yield/rate		Average balance			Amount of interest 1		Average yield/rate
ASSETS
Money market investments	$	1,598		$	14	1.15	%	$	4,099		$	18	0.57	%
Securities:
Held-to-maturity	795			23		3.94		646			22		4.53
Available-for-sale	14,873			236		2.12		8,889			130		1.95
Trading account	61			2		3.61		71			2		3.59
Total securities 2	15,729			261		2.22		9,606			154		2.13
Loans held for sale	95			2		3.42		133			4		3.61
Loans and leases 3
Commercial	21,920			712		4.34		21,791			684		4.20
Commercial real estate	11,222			377		4.49		11,020			350		4.24
Consumer	10,076			289		3.84		9,057			261		3.86
Total loans and leases	43,218			1,378		4.26		41,868			1,295		4.13
Total interest-earning assets	60,640			1,655		3.65		55,706			1,471		3.53
Cash and due from banks	844							601
Allowance for loan losses	(551		)					(605		)
Goodwill	1,014							1,014
Core deposit and other intangibles	6							13
Other assets	2,967							2,751
Total assets	$	64,920						$	59,480
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest-bearing deposits:
Savings and money market	$	25,515		28		0.15	%	$	25,605		28		0.15	%
Time	2,946			15		0.65		2,230			8		0.47
Foreign	—			—		—		163			—		0.28
Total interest-bearing deposits	28,461			43		0.20		27,998			36		0.17
Borrowed funds:
Federal funds and other short-term borrowings	3,951			29		0.98		386			1		0.22
Long-term debt	428			18		5.81		759			29		5.06
Total borrowed funds	4,379			47		1.45		1,145			30		3.43
Total interest-bearing liabilities	32,840			90		0.37		29,143			66		0.30
Noninterest-bearing deposits	23,694							22,064
Other liabilities	609							615
Total liabilities	57,143							51,822
Shareholders’ equity:
Preferred equity	653							772
Common equity	7,124							6,886
Total shareholders’ equity	7,777							7,658
Total liabilities and shareholders’ equity	$	64,920						$	59,480
Spread on average interest-bearing funds						3.28	%						3.23	%
Taxable-equivalent net interest income and net yield on interest-earning assets				$	1,565	3.45	%				$	1,405	3.37	%

¹  Taxable-equivalent rates used where applicable.

²  Year-to-date interest on total securities includes $101 million and $73 million of premium amortization, as of September 30, 2017 and September 30, 2016, respectively.

³  Net of unearned income and fees, net of related costs. Loans include nonaccrual and restructured loans.

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Provision for Credit Losses

The provision for credit losses is the combination of both the provision for loan losses and the provision for unfunded lending commitments. The provision for loan losses is the amount of expense that, in our judgment, is required to maintain the allowance for loan and lease losses (“ALLL”) at an adequate level based on the inherent risks in the loan portfolio. The provision for unfunded lending commitments is used to maintain the reserve for unfunded lending commitments (“RULC”) at an adequate level based on the inherent risks associated with such commitments. In determining adequate levels of the ALLL and RULC, we perform periodic evaluations of our various loan portfolios, the levels of actual charge-offs, credit trends, and external factors. See Note 6 of our 2016 Annual Report on Form 10-K and “Credit Risk Management” on page 20 for more information on how we determine the appropriate level for the ALLL and the RULC.

The provision for loan losses was $5 million in the third quarter of 2017, compared with $19 million in the same prior year period. Strong overall credit quality, including steady improvement in the oil and gas-related portfolio have led to lower modeled reserves, requiring a lower provision. Nonaccrual and classified loans both decreased between the two periods by $98 million and $367 million, respectively. Net charge offs also declined $22 million over the same timeframe. The Company has roughly $8 billion of loan balances in the geographic area impacted by Hurricane Harvey. We have reached out to many of our customers to understand their concerns and to offer reasonable assistance. Using multiple top-down and bottom-up analyses to estimate losses resulting from the hurricane, we have added a qualitative allowance of $34 million.

During the third quarter of 2017, we recorded a $(4) million provision for unfunded lending commitments, compared with a $(3) million provision in the third quarter of 2016. From quarter to quarter, the provision for unfunded lending commitments may be subject to sizable fluctuations due to changes in the timing and volume of loan commitments, originations, fundings, and changes in credit quality.

The ACL, which is the combination of both the ALLL and the RULC, decreased $59 million when compared with the third quarter of 2016. Even with loan growth and the above-mentioned hurricane impact, robust credit quality and decreased net charge-offs in the total loan portfolio were responsible for much of this reduction. Further, declining oil and gas-related exposure and increasing non-oil and gas-related C&I and 1-4 family residential mortgage exposure improved the risk profile of the portfolio.

Noninterest Income

	Three Months Ended September 30,				Percent change		Nine Months Ended September 30,				Percent change
(Dollar amounts in millions)	2017		2016				2017		2016
Service charges and fees on deposit accounts	$	42	$	45	(6.7	)%	$	127	$	128	(0.8	)%
Other service charges, commissions and fees	55		54		1.9		160		156		2.6
Wealth management income	11		10		10.0		30		27		11.1
Loan sales and servicing income	6		11		(45.5	)	19		29		(34.5	)
Capital markets and foreign exchange	8		6		33.3		21		16		31.3
Customer-related fees	122		126		(3.2	)	357		356		0.3
Dividends and other investment income	9		9		—		31		20		55.0
Securities gains, net	5		8		(37.5	)	13		11		18.2
Other	3		2		50.0		3		1		200.0
Total noninterest income	$	139	$	145	(4.1	)	$	404	$	388	4.1

Noninterest income represents revenues we earn for products and services that have no associated interest rate or yield. For the third quarter of 2017, noninterest income decreased $6 million, or 4.1% compared with the third quarter of 2016. Through September 30, 2017, year-to-date noninterest income increased $16 million, or 4.1%, compared with the first nine months of 2016. Noninterest income decreased compared with the third quarter of 2016 due to lower loan sales volume, decreased deposit fees, and a decline in net securities gains.

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We believe a subtotal of customer-related fees provides a better view of income over which we have more direct control. It excludes items such as dividends, insurance-related income, mark-to-market adjustments on certain derivatives, and securities gains and losses. Customer-related fees decreased $4 million from the third quarter of 2016. Service charges on deposit accounts decreased largely due to increased earnings credits on analyzed business accounts. Loan sales and servicing income declined primarily because loan sales volume was down from an unusually high amount in the third quarter of 2016 and a $2 million loss on a loan classified as held for sale in the most recent period. The year-to-date decline in loan sales and servicing income was due to similar factors. We continue to see steady improvement in credit card interchange fees and are growing our wealth management and trust businesses. We expect moderate growth in customer-related fees over the next twelve months.

Noninterest Expense

	Three Months Ended September 30,						Percent change		Nine Months Ended September 30,						Percent change
(Dollar amounts in millions)	2017			2016					2017			2016
Salaries and employee benefits	$	253		$	242		4.5	%	$	756		$	742		1.9	%
Occupancy, net	35			33			6.1		101			93			8.6
Furniture, equipment and software, net	32			29			10.3		96			92			4.3
Other real estate expense, net	(1		)	—			NM		(1		)	(2		)	50.0
Credit-related expense	7			7			—		23			19			21.1
Provision for unfunded lending commitments	(4		)	(3		)	(33.3	)	(6		)	(13		)	53.8
Professional and legal services	14			14			—		42			38			10.5
Advertising	6			6			—		17			17			—
FDIC premiums	15			12			25.0		40			28			42.9
Amortization of core deposit and other intangibles	2			2			—		5			6			(16.7	)
Other	54			61			(11.5	)	159			161			(1.2	)
Total noninterest expense	$	413		$	403		2.5		$	1,232		$	1,181		4.3
Adjusted noninterest expense 1	$	414		$	404		2.5		$	1,225		$	1,185		3.4

¹ For information on non-GAAP financial measures see “GAAP to Non-GAAP Reconciliations” on page 5

We have previously forecast increases in noninterest expense for 2017. Noninterest expense increased by $10 million over the third quarter of 2016 and $51 million compared with the first nine months of 2016. Expenses increased in most areas, but were most impacted by higher FDIC premiums, salaries and benefits, and occupancy costs.

Salary and benefits expense was up $11 million from the third quarter of 2016, and $14 million year to date. Elevated noninterest expense in the third quarter of 2016 was partially offset by a lower accrual for incentive compensation; this reduction did not occur in the most recent quarter. In 2017, we have also experienced a higher volume of medical claims in the Company’s self-funded healthcare plan.

Occupancy expense increased $2 million from the third quarter of 2016, and increased $8 million compared with the first nine months of 2016. The increase was primarily due to damage to buildings caused by Hurricane Harvey. In the first quarter of 2017, we also placed a newly constructed office building into operation in Houston and have incurred additional depreciation and other transition expenses as a result. The Company has several signed leases with tenants, and as those tenants move in, we expect additional rental income to mostly offset the increase we have observed thus far in 2017.

We implemented the first release of the TCS BαNCS core servicing system during the second quarter. Associated amortization of the costs capitalized during development caused most of the $3 million variance from the third quarter of 2017 in furniture, equipment and software expense.

The Company’s provision for unfunded lending commitments has remained relatively steady over the past twelve months. We released $1 million more of our reserve through the provision for unfunded lending commitments

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compared with the third quarter of 2016, and released $7 million less compared with the first nine months of 2016. Credit concerns in the oil and gas-related portfolio have stabilized as oil prices have rebounded. Refer to the Provision for Credit Losses section above for more details.

FDIC premium expense increased $3 million or 25.0% from the third quarter of 2016, and $12 million, or 42.9%, compared with the first nine months of 2016. Expense increased in both cases due to a higher deposit base and the FDIC surcharge. The FDIC approved a change in deposit insurance assessments that implemented a Dodd-Frank Act provision requiring banks with over $10 billion in assets to recapitalize the FDIC insurance fund to 1.35% over an eight-quarter period, after it reached a 1.15% reserve ratio. The 1.15% threshold was reached at the end of the second quarter of 2016 and the increased premium has been effective since then.

Other noninterest expense decreased $7 million over the third quarter of 2016 and $2 million, compared with the first nine months of 2016. A limited increase in losses due to Hurricane Harvey in the most recent quarter was more than offset by lower operational losses and legal reserves. No single item had a significant impact on the year-to-date variance.

Our goal is to limit adjusted noninterest expense growth to 2-3% in 2017 as we continue to invest in people and technology. For the first nine months of 2017, adjusted noninterest expense was $1.225 billion and we are committed to achieving our target. To arrive at adjusted noninterest expense, GAAP noninterest expense is adjusted to exclude certain expense items, which are the same as those items excluded in arriving at the efficiency ratio (see “GAAP to Non-GAAP Reconciliations” on page 5 for more information regarding the calculation of the efficiency ratio).

Income Taxes

Income tax expense for the third quarter of 2017 was $83 million, compared with $65 million for the same prior year period. The effective tax rates were 34.2% and 33.9% for the third quarters of 2017 and 2016, respectively. Income tax expense was $207 million for the first nine months of 2017 and $166 million for the first nine months of 2016. The effective tax rates for these year-to-date periods were 30.6% and 33.3%, respectively. Tax rates generally benefited from the nontaxability of certain income items. 2017 rates were further impacted by the following factors:

• We reevaluated our state tax positions in the first quarter of 2017, which resulted in a one-time $14 million tax benefit.

• We reduced income tax expense by $4 million in the second quarter of 2017 due to changes in the carrying value of various state deferred tax items.

• We recorded an $8 million benefit in the first nine months of 2017, from the implementation of new accounting guidance related to stock-based compensation.

We had a net deferred tax asset (“DTA”) balance of $207 million at September 30, 2017, compared with $250 million at December 31, 2016. The decrease in the DTA resulted primarily from net charge-offs exceeding the provision for loan losses, the payout of accrued compensation, and the reduction of unrealized losses in other comprehensive income (“OCI”) related to securities. A decrease in deferred tax liabilities during 2017, which related to premises and equipment and the deferred gain on a prior period debt exchange, offset some of the overall decrease in DTA.

Preferred Dividends

Our preferred dividends decreased $2 million when compared with the third quarter of 2016 and $6 million, compared with the first nine months of 2016. In the second quarters of 2017 and 2016, the Company redeemed preferred stock of $144 million and $118 million, respectively. The total one-time reduction to net earnings applicable to common shareholders associated with preferred stock redemptions was $2 million for the 2017 redemption and $10 million for the 2016 redemption, primarily due to the accelerated recognition of preferred stock issuance costs.

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As a result of these transactions, preferred dividends are expected to be $10 million in the fourth quarter of 2017 and the second quarter of 2018, and $8 million in the first and third quarters of 2018.

BALANCE SHEET ANALYSIS

Interest-Earning Assets

Interest-earning assets are those assets that have interest rates or yields associated with them. One of our goals is to maintain a high level of interest-earning assets relative to total assets while keeping nonearning assets at a minimum. Interest-earning assets consist of money market investments, securities, loans, and leases.

Another goal is to maintain a higher-yielding mix of interest-earning assets, such as loans, relative to lower-yielding assets, while maintaining adequate levels of highly liquid assets. As a result of this goal we redeployed funds from lower-yielding money market investments, in addition to using wholesale borrowings, to purchase agency securities.

For information regarding the average balances of our interest-earning assets, the amount of revenue generated by them, and their respective yields, see the average balance sheet on page 11.

Average interest-earning assets were $60.6 billion for the first nine months of 2017, compared with $55.7 billion for the first nine months of 2016. Average interest-earning assets as a percentage of total average assets for the first nine months of 2017 and 2016 were 93.4% and 93.7%, respectively.

Average loans were $43.2 billion and $41.9 billion for the first nine months of 2017 and 2016, respectively. Average loans as a percentage of total average assets for the first nine months of 2017 were 66.6%, compared with 70.4% in the same prior year period.

Average money market investments, consisting of interest-bearing deposits, federal funds sold, and security resell agreements, decreased by 61.0% to $1.6 billion for the first nine months of 2017, compared with $4.1 billion for the first nine months of 2016. Average securities increased by 63.7% for the first nine months of 2017, compared with the first nine months of 2016.

Investment Securities Portfolio

We invest in securities to actively manage liquidity and interest rate risk, in addition to generating revenue for the Company. Refer to the “Liquidity Risk Management” section on page 34 for additional information on management of liquidity and funding and compliance with Basel III and Liquidity Coverage Ratio (“LCR”) requirements. The following schedule presents a profile of our investment securities portfolio. The amortized cost amounts represent the original cost of the investments, adjusted for related accumulated amortization or accretion of any yield adjustments, and for impairment losses, including credit-related impairment. The estimated fair value measurement levels and methodology are discussed in Note 20of our 2016 Annual Report on Form 10-K.

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INVESTMENT SECURITIES PORTFOLIO

	September 30, 2017						December 31, 2016
(In millions)	Par value		Amortized cost		Estimated fair value		Par value		Amortized cost		Estimated fair value
Held-to-maturity
Municipal securities	$	747	$	746	$	743	$	868	$	868	$	850
Available-for-sale
U.S. Treasury securities	25		25		25		—		—		—
U.S. Government agencies and corporations:
Agency securities	1,839		1,839		1,840		1,847		1,846		1,839
Agency guaranteed mortgage-backed securities	9,537		9,748		9,683		7,745		7,986		7,883
Small Business Administration loan-backed securities	2,055		2,281		2,291		2,066		2,298		2,288
Municipal securities	1,141		1,281		1,291		1,048		1,182		1,154
Other debt securities	25		25		25		25		25		24
	14,622		15,199		15,155		12,731		13,337		13,188
Money market mutual funds and other	87		87		87		184		184		184
	14,709		15,286		15,242		12,915		13,521		13,372
Total	$	15,456	$	16,032	$	15,985	$	13,783	$	14,389	$	14,222

The amortized cost of investment securities at September 30, 2017 increased by 11.4% from the balances at December 31, 2016, due to purchases of agency guaranteed mortgage-backed securities.

The investment securities portfolio includes $576 million of net premium that is distributed across various asset classes as illustrated in the preceding schedule. The purchase premiums and discounts for both held-to-maturity (“HTM”) and AFS securities are amortized and accreted at a constant effective yield to the contractual maturity date and no assumption is made concerning prepayments. As principal prepayments occur, the portion of the unamortized premium or discount associated with the principal reduction is recognized as interest income in the period the principal is reduced. For the three and nine months ended September 30, 2017, premium amortization reduced the yield on securities by 89 and 90 bps, respectively, compared with a 117 bps and 110 bps impact for the same periods in 2016. The lower level of premium amortization was attributable to slower prepayment speeds. In addition, yields of floating-rate securities, primarily Small Business Administration (“SBA”) loan-backed securities, benefited from increases in reference indices.

As of September 30, 2017, under the GAAP fair value accounting hierarchy, 0.7% of the $15.2 billion fair value of the AFS securities portfolio was valued at Level 1, 99.3% was valued at Level 2, and there were no Level 3 AFS securities. At December 31, 2016, 1.4% of the $13.4 billion fair value of AFS securities portfolio was valued at Level 1, 98.6% was valued at Level 2, and there were no Level 3 AFS securities. See Note 20 of our 2016 Annual Report on Form 10-K for further discussion of fair value accounting.

Exposure to State and Local Governments

We provide multiple products and services to state and local governments (referred to collectively as “municipalities”), including deposit services, loans, and investment banking services, and we invest in securities issued by the municipalities.

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The following schedule summarizes our exposure to state and local municipalities:

MUNICIPALITIES

(In millions)	September 30, 2017		December 31, 2016
Loans and leases	$	1,073	$	778
Held-to-maturity – municipal securities	746		868
Available-for-sale – municipal securities	1,292		1,154
Trading account – municipal securities	55		112
Unfunded lending commitments	156		182
Total direct exposure to municipalities	$	3,322	$	3,094

At September 30, 2017, one municipal loan with a balance of $1 million was on nonaccrual. A significant amount of the municipal loan and lease portfolio is secured by real estate and equipment, and 80.6% of the outstanding credits were originated by CB&T, Zions Bank, and Vectra. See Note 6 of the Notes to Consolidated Financial Statements for additional information about the credit quality of these municipal loans.

Growth in municipal exposure came primarily from increases in loans and leases and municipal AFS securities portfolio. AFS securities generally consist of securities with investment-grade ratings from one or more major credit rating agencies.

Foreign Exposure and Operations

Our credit exposure to foreign sovereign risks and total foreign credit exposure is not significant. We also do not have significant foreign exposure to derivative counterparties. We had no foreign deposits at September 30, 2017 and December 31, 2016.

Loan Portfolio

For the first nine months of 2017 and 2016, average loans accounted for 66.6% and 70.4%, respectively, of total average assets. As presented in the following schedule, the largest category was commercial and industrial loans, which constituted 31.8% of our loan portfolio at September 30, 2017.

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LOAN PORTFOLIO

	September 30, 2017				December 31, 2016
(Dollar amounts in millions)	Amount		% of total loans		Amount		% of total loans
Commercial:
Commercial and industrial	$	14,041	31.8	%	$	13,452	31.5	%
Leasing	343		0.8		423		1.0
Owner-occupied	7,082		16.0		6,962		16.3
Municipal	1,073		2.4		778		1.8
Total commercial	22,539		51.0		21,615		50.6
Commercial real estate:
Construction and land development	2,170		4.9		2,019		4.7
Term	8,944		20.3		9,322		21.9
Total commercial real estate	11,114		25.2		11,341		26.6
Consumer:
Home equity credit line	2,745		6.2		2,645		6.2
1-4 family residential	6,522		14.8		5,891		13.8
Construction and other consumer real estate	558		1.3		486		1.2
Bankcard and other revolving plans	490		1.1		481		1.1
Other	188		0.4		190		0.5
Total consumer	10,503		23.8		9,693		22.8
Total net loans	$	44,156	100.0	%	$	42,649	100.0	%

Loan portfolio growth during the first nine months of 2017 was widespread across loan products and geographies with particular strength in consumer 1-4 family residential and commercial and industrial loans. The impact of these increases was partially offset by a decrease in our CRE term portfolio.

Commercial owner-occupied loans also increased during the first nine months of 2017; however, we experienced continued runoff and attrition of the National Real Estate portfolio. The National Real Estate business is a wholesale business that depends on loan referrals from other community banking institutions. Due to generally soft loan demand nationally, many community banking institutions are retaining, rather than selling, their loan production.

Other Noninterest-Bearing Investments

During the first nine months of 2017, the Company increased its short-term borrowings with the Federal Home Loan Bank (“FHLB”) by $2.8 billion. This increase required a further investment in FHLB activity stock, which consequently increased by $110 million during the year. Aside from this increase, other noninterest-bearing investments remained relatively stable as set forth in the following schedule.

OTHER NONINTEREST-BEARING INVESTMENTS

(In millions)	September 30, 2017		December 31, 2016
Bank-owned life insurance	$	504	$	497
Federal Home Loan Bank stock	140		30
Federal Reserve stock	184		181
Farmer Mac stock	42		34
Small Business Investment Company investments	123		124
Non-Small Business Investment Company investment funds	12		15
Other	3		3
	$	1,008	$	884

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Premises, Equipment and Software

Net premises, equipment and software increased $63 million, or 6.2%, during the first nine months of 2017 primarily due to capitalized costs associated with the development of a new corporate facility for Amegy Bank in Texas, major software purchases, and the capitalization of eligible costs related to the development of new lending, deposit and reporting systems.

Deposits

Deposits, both interest-bearing and noninterest-bearing, are a primary source of funding for the Company. Average total deposits for the first nine months of 2017 increased by 4.2%, compared with the first nine months of 2016, with average interest-bearing deposits increasing by 3.9% and average noninterest-bearing deposits increasing by 7.4%. The increases in interest and noninterest-bearing deposits were driven by increases in both personal and business customer balances. The ending interest-bearing deposits balance at September 30, 2017 decreased by 0.4% to $28.1 billion from $28.2 billion at June 30, 2017. The decrease in ending balance is mainly due to the natural daily volatility of deposits and certain customers sweeping funds off of our balance sheet to take advantage of higher rates in the capital markets. The average interest rate paid for interest-bearing deposits was 3 bps higher during the first nine months of 2017, compared with the first nine months of 2016.

Deposits at September 30, 2017, excluding time deposits $100,000 and over and brokered deposits, decreased slightly to $50.4 billion from $51.4 billion at December 31, 2016. The decrease was mainly due to a decrease in interest-bearing domestic savings and money market deposits.

Demand and savings and money market deposits were 94.4% and 94.8% of total deposits at September 30, 2017 and December 31, 2016, respectively. At September 30, 2017 and December 31, 2016, total deposits included $1.3 billion and $0.9 billion, respectively, of brokered deposits.

See “Liquidity Risk Management” on page 34 for additional information on funding and borrowed funds.

RISK ELEMENTS

Since risk is inherent in substantially all of the Company’s operations, management of risk is an integral part of its operations and is also a key determinant of its overall performance. The Board of Directors has appointed a Risk Oversight Committee (“ROC”) that consists of appointed Board members who oversee the Company’s risk management processes. The ROC meets on a regular basis to monitor and review Enterprise Risk Management (“ERM”) activities. As required by its charter, the ROC performs oversight for various ERM activities and approves ERM policies and activities as detailed in the ROC charter.

Management applies various strategies to reduce the risks to which the Company’s operations are exposed, including credit, interest rate and market, liquidity, and operational risks. These risks are overseen by the various management committees of which the Enterprise Risk Management Committee (“ERMC”) is the focal point for the monitoring and review of enterprise risk.

Credit Risk Management

Credit risk is the possibility of loss from the failure of a borrower, guarantor, or another obligor to fully perform under the terms of a credit-related contract. Credit risk arises primarily from our lending activities, as well as from off-balance sheet credit instruments.

The Board of Directors, through the ROC, is responsible for approving the overall credit policies relating to the management of the credit risk of the Company. In addition, the ROC oversees and monitors adherence to key credit policies and the credit risk appetite as defined in the Risk Appetite Framework. Additionally, the Board has established the Credit Administration Committee, chaired by the Chief Credit Officer and consisting of members of management, to which it has delegated the responsibility for managing credit risk for the Company and approving changes to the Company’s credit policies.

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Centralized oversight of credit risk is provided through credit policies, credit risk management, and credit examination functions. Our credit polices place emphasis on strong underwriting standards and early detection of potential problem credits in order to develop and implement action plans on a timely basis to mitigate any potential losses. These formal credit policies and procedures provide the Company with a framework for consistent underwriting and a basis for sound credit decisions at the local banking affiliate level.

Our credit risk management function is separate from the lending function and strengthens control over, and the independent evaluation of, credit activities. In addition, we have a well-defined set of standards for regularly evaluating our loan portfolio, and we utilize a comprehensive loan risk-grading system to determine the risk potential in the portfolio. Furthermore, the internal credit examination department, which is independent of the lending function, periodically conducts examinations of the Company’s lending departments and credit activities. These examinations are designed to review credit quality, adequacy of documentation, appropriate loan risk-grading administration, and compliance with credit policies. New, expanded, or modified products and services, as well as new lines of business, are approved by the New Initiative Review Committee.

Our credit risk management strategy includes diversification of our loan portfolio. We attempt to avoid the risk of an undue concentration of credits in a particular collateral type or with an individual customer or counterparty. Generally, our loan portfolio is well diversified; however, due to the nature of our geographical footprint, there are certain significant concentrations, primarily in CRE and oil and gas-related lending. We have adopted and adhere to concentration limits on leveraged lending, municipal lending, oil and gas-related lending, and various types of CRE lending, particularly construction and land development lending. All of these limits are continually monitored and revised as necessary. The recent growth in construction and land development loan commitments is within the established concentration limits. Our business activity is primarily with customers located within the geographical footprint of our banking affiliates.

As we continue to monitor our concentration risk, the composition of our loan portfolio has slightly changed. Oil and gas-related loans represented 4.6% of the total loan portfolio at September 30, 2017, compared with 5.1% at December 31, 2016. Total commercial and CRE loans were 51.0% and 25.2% of the total portfolio at September 30, 2017, compared with 50.6% and 26.6%, at December 31, 2016, respectively. Consumer loans have grown to represent 23.8% of the total loan portfolio at September 30, 2017, compared with 22.8% at December 31, 2016.

Government Agency Guaranteed Loans

We participate in various guaranteed lending programs sponsored by U.S. government agencies, such as the SBA, Federal Housing Authority, Veterans’ Administration, Export-Import Bank of the U.S., and the U.S. Department of Agriculture. As of September 30, 2017, the principal balance of these loans was $533 million, and the guaranteed portion of these loans was $403 million. Most of these loans were guaranteed by the SBA.

The following schedule presents the composition of government agency guaranteed loans.

GOVERNMENT GUARANTEES

(Dollar amounts in millions)	September 30, 2017		Percent guaranteed		December 31, 2016		Percent guaranteed
Commercial	$	502	75	%	$	519	75	%
Commercial real estate	15		74		18		75
Consumer	16		92		17		92
Total loans	$	533	76		$	554	76

Commercial Lending

The following schedule provides selected information regarding lending concentrations to certain industries in our commercial lending portfolio.

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COMMERCIAL LENDING BY INDUSTRY GROUP

	September 30, 2017				December 31, 2016
(Dollar amounts in millions)	Amount		Percent		Amount		Percent
Real estate, rental and leasing	$	2,726	12.1	%	$	2,624	12.1	%
Retail trade 1	2,269		10.0		2,145		9.9
Manufacturing	2,158		9.6		2,161		10.0
Finance and insurance	1,758		7.8		1,462		6.8
Wholesale trade	1,456		6.5		1,444		6.7
Healthcare and social assistance	1,444		6.4		1,538		7.1
Transportation and warehousing	1,341		6.0		1,300		6.0
Mining, quarrying and oil and gas extraction	1,270		5.6		1,403		6.5
Construction	1,111		4.9		1,076		5.0
Accommodation and food services	973		4.3		925		4.3
Other Services (except Public Administration)	939		4.2		881		4.1
Utilities 2	885		3.9		783		3.6
Professional, scientific, and technical services	859		3.8		875		4.0
Other 3	3,350		14.9		2,998		13.9
Total	$	22,539	100.0	%	$	21,615	100.0	%

¹  At September 30, 2017, 82% of retail trade consist of motor vehicle and parts dealers, gas stations, grocery stores, building material suppliers, and direct-to-consumer retailers. For additional detail on our CRE retail exposure, see the Commercial Real Estate Loans section on page 25.

²  Includes primarily utilities, power, and renewable energy.

³  No other industry group exceeds 3.5%.

Oil and Gas-Related Exposure

Various industries represented in the previous schedule, including mining, quarrying and oil and gas extraction, manufacturing, and transportation and warehousing, contain certain loans we categorize as oil and gas-related. At September 30, 2017 and December 31, 2016, we had approximately $3.8 billion and $3.9 billion, respectively, of total oil and gas-related credit exposure. The distribution of oil and gas-related loans by customer market segment is shown in the following schedule:

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OIL AND GAS-RELATED EXPOSURE ¹ 

										3Q17 - 4Q16					3Q17 - 3Q16
(Dollar amounts in millions)	September 30, 2017			December 31, 2016			September 30, 2016			$			%		$			%
Loans and leases
Upstream – exploration and production	$	784		$	733		$	752		$	51		7	%	$	32		4	%
Midstream – marketing and transportation	601			598			623			3			1		(22		)	(4	)
Downstream – refining	100			137			123			(37		)	(27	)	(23		)	(19	)
Other non-services	40			38			44			2			5		(4		)	(9	)
Oilfield services	412			500			596			(88		)	(18	)	(184		)	(31	)
Oil and gas service manufacturing	109			152			176			(43		)	(28	)	(67		)	(38	)
Total loan and lease balances 2	2,046			2,158			2,314			(112		)	(5	)	(268		)	(12	)
Unfunded lending commitments	1,799			1,722			1,784			77			4		15			1
Total oil and gas credit exposure	$	3,845		$	3,880		$	4,098		$	(35	)	(1	)	$	(253	)	(6	)
Private equity investments	$	4		$	7		$	6		$	(3	)	(43	)	$	(2	)	(33	)
Credit quality measures 2
Criticized loan ratio	29.8		%	37.8		%	41.8		%
Classified loan ratio	24.0		%	31.6		%	33.1		%
Nonaccrual loan ratio	10.2		%	13.6		%	15.0		%
Ratio of nonaccrual loans that are current	67.9		%	86.1		%	87.3		%
Net charge-off ratio, annualized 3	1.2		%	3.0		%	7.1		%

¹  Because many borrowers operate in multiple businesses, judgment has been applied in characterizing a borrower as oil and gas-related, including a particular segment of oil and gas-related activity, e.g., upstream or downstream; typically, 50% of revenues coming from the oil and gas sector is used as a guide.

² Total loan and lease balances and the credit quality measures do not include oil and gas loans held for sale at period end.

³  Calculated as the ratio of annualized net charge-offs to the beginning loan balances for each respective period.

During the third quarter of 2017, our overall balance of oil and gas-related loans decreased by $112 million, or 5.2%, from year-end 2016, and decreased by $268 million, or 11.6%, from the third quarter of 2016. Oil and gas-related loans represented 4.6% of the total loan portfolio at September 30, 2017, compared with 5.1% at December 31, 2016 and 5.4% at September 30, 2016. Unfunded oil and gas-related lending commitments increased by $77 million, or 4.5% during the third quarter of 2017, from year-end 2016, and increased by $15 million, or 0.8%, from the third quarter of 2016. The increase in unfunded oil and gas-related lending commitments was primarily in the midstream portfolio.

Classified oil and gas-related credits decreased to $492 million at September 30, 2017, from $681 million at December 31, 2016. Oil and gas-related loan net charge-offs were $6 million in the third quarter of 2017, predominantly in the oil and gas services portfolio, compared with $16 million in the fourth quarter of 2016 and $41 million in the third quarter of 2016.

Nonaccruing oil and gas-related loans decreased by $85 million from the fourth quarter of 2016, primarily in the oil and gas services portfolio. Approximately 68% of oil and gas-related nonaccruing loans were current as to principal and interest payments at September 30, 2017, which declined from 86% at December 31, 2016.

Risk Management of the Oil and Gas-Related Portfolio

The oil and gas-related portfolio is comprised of three primary segments: upstream, midstream, and oil and gas services. Upstream exploration and production loan borrowers have relatively balanced production between oil and gas. Midstream loans are made to companies that gather, transport, treat and blend oil and natural gas, or that provide services to similar companies. Oil and gas services loans, which include oilfield services and oil and gas service manufacturing, include borrowers that have a concentration of revenues in the oil and gas industry. However, many of these borrowers provide a broad range of products and services to the oil and gas industry and

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are diversified geographically. For a more comprehensive discussion of these segments, refer to our 2016 Annual Report on Form 10-K.

We apply concentration limits and disciplined underwriting to the entire oil and gas-related loan portfolio to limit our risk exposure. As an indicator of the diversity in the size of our oil and gas-related portfolio, the average amount of our commitments is approximately $6 million, with approximately 68% of the commitments less than $30 million. Additionally, there are instances where we have commitments to companies with a common sponsor, which, if combined, would result in higher commitment levels than $30 million. The portfolio contains only senior loans – no junior or second lien positions; additionally, we cautiously approach making first-lien loans to borrowers that employ excessive leverage through the use of junior lien loans or unsecured layers of debt. Approximately 87% of the total oil and gas-related portfolio is secured by reserves, equipment, real estate, and other collateral, or a combination of collateral types.

We participate as a lender in loans and commitments designated as Shared National Credits (“SNCs”), which generally consist of larger and more diversified borrowers that have better access to capital markets. SNCs are loans or loan commitments of at least $20 million that are shared by three or more federally supervised institutions. The percentage of SNCs is 80% of the upstream portfolio, 80% of the midstream portfolio, and 46% of the oil and gas services portfolio. Our bankers have direct access and contact with the management of these SNC borrowers, and as such, are active participants. In many cases, we provide ancillary banking services to these borrowers, further evidencing this direct relationship. The results of the recent SNC exam are reflected in our financial statements.

As a secondary source of support, many of our oil and gas-related borrowers have access to capital markets and private equity sources. Private sponsors tend to be large funds, often with assets under management of more than $1 billion, managed by individuals with a great deal of oil and gas expertise and experience and who have successfully managed investments through previous oil and gas price cycles. The investors in the funds are primarily institutional investors, such as large pensions, foundations, trusts, and high net worth family offices.

When establishing the level of the ACL, we consider multiple factors, including reduced drilling activity and additional capital raises by borrowers and their sponsors. The ACL related to the oil and gas portfolio remains above 7% for the third quarter of 2017.

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Commercial Real Estate Loans

Selected information indicative of credit quality regarding our CRE loan portfolio is presented in the following schedule.

COMMERCIAL REAL ESTATE PORTFOLIO BY LOAN TYPE AND COLLATERAL LOCATION

(Dollar amounts in millions)		Collateral Location
Loan type	As of date	Arizona			California			Colorado			Nevada			Texas			Utah/ Idaho			Wash-ington			Other 1			Total			% of  total CRE
Commercial term
Balance outstanding	9/30/2017	$	1,042		$	2,987		$	430		$	567		$	1,642		$	1,325		$	419		$	532		$	8,944		80.5	%
% of loan type		11.7		%	33.4		%	4.8		%	6.3		%	18.4		%	14.8		%	4.7		%	5.9		%	100.0		%
Delinquency rates 2:
30-89 days	9/30/2017	0.1		%	—		%	—		%	0.2		%	0.1		%	0.1		%	—		%	0.6		%	0.1		%
	12/31/2016	0.1		%	—		%	—		%	0.7		%	—		%	0.1		%	0.1		%	0.1		%	0.1		%
≥ 90 days	9/30/2017	0.2		%	0.1		%	—		%	—		%	0.1		%	0.1		%	0.2		%	0.5		%	0.1		%
	12/31/2016	0.2		%	0.4		%	—		%	—		%	—		%	0.1		%	—		%	1.2		%	0.2		%
Accruing loans past due 90 days or more	9/30/2017	$	—		$	2		$	—		$	—		$	—		$	—		$	—		$	—		$	2
	12/31/2016	—			10			—			—			—			2			—			—			12
Nonaccrual loans	9/30/2017	$	7		$	8		$	1		$	3		$	17		$	1		$	1		$	3		$	41
	12/31/2016	8			11			—			2			1			—			7			—			29
Residential construction and land development
Balance outstanding	9/30/2017	$	30		$	286		$	54		$	4		$	225		$	36		$	5		$	5		$	645		5.8	%
% of loan type		4.6		%	44.3		%	8.4		%	0.6		%	34.9		%	5.6		%	0.8		%	0.8		%	100.0		%
Delinquency rates 2:
30-89 days	9/30/2017	—		%	0.1		%	—		%	—		%	1.6		%	—		%	—		%	—		%	0.6		%
	12/31/2016	1.8		%	—		%	—		%	—		%	0.3		%	—		%	—		%	—		%	0.2		%
≥ 90 days	9/30/2017	—		%	—		%	—		%	—		%	0.6		%	—		%	—		%	—		%	0.2		%
	12/31/2016	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%
Accruing loans past due 90 days or more	9/30/2017	$	—		$	—		$	—		$	—		$	1		$	—		$	—		$	—		$	1
	12/31/2016	—			—			—			—			—			—			—			—			—
Nonaccrual loans	9/30/2017	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
	12/31/2016	—			—			—			—			—			—			—			—			—
Commercial construction and land development
Balance outstanding	9/30/2017	$	116		$	315		$	108		$	94		$	486		$	260		$	102		$	44		$	1,525		13.7	%
% of loan type		7.6		%	20.6		%	7.1		%	6.2		%	31.9		%	17.0		%	6.7		%	2.9		%	100.0		%
Delinquency rates 2:
30-89 days	9/30/2017	—		%	0.8		%	—		%	—		%	—		%	—		%	—		%	—		%	0.2		%
	12/31/2016	—		%	—		%	—		%	0.9		%	—		%	2.5		%	—		%	—		%	0.5		%
≥ 90 days	9/30/2017	—		%	—		%	—		%	—		%	—		%	1.9		%	—		%	—		%	0.3		%
	12/31/2016	—		%	—		%	—		%	—		%	0.4		%	—		%	—		%	—		%	0.2		%
Accruing loans past due 90 days or more	9/30/2017	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
	12/31/2016	—			—			—			—			—			—			—			—			—
Nonaccrual loans	9/30/2017	$	—		$	—		$	—		$	—		$	—		$	5		$	—		$	—		$	5
	12/31/2016	—			—			—			—			2			5			—			—			7
Total construction and land development	9/30/2017	$	146		$	601		$	162		$	98		$	711		$	296		$	107		$	49		$	2,170
Total commercial real estate	9/30/2017	$	1,188		$	3,588		$	592		$	665		$	2,353		$	1,621		$	526		$	581		$	11,114		100.0	%

¹  No other geography exceeds $67 million for all three loan types.

²  Delinquency rates include nonaccrual loans.

Approximately 21% of the CRE term loans consist of mini-perm loans as of September 30, 2017. For such loans, construction has been completed and the project has stabilized to a level that supports the granting of a mini-perm loan in accordance with our underwriting standards. Mini-perm loans generally have initial maturities of three to

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seven years. The remaining 79% of CRE loans are term loans with initial maturities generally of 5 to 20 years. The stabilization criteria for a project to qualify for a term loan differ by product type and include criteria related to the cash flow generated by the project, loan-to-value ratio, and occupancy rates.

Approximately $134 million, or 9%, of the commercial construction and land development portfolio at September 30, 2017 consists of acquisition and development loans. Most of these acquisition and development loans are secured by specific retail, apartment, office, or other projects.

Of the total CRE loan portfolio we categorize $1.9 billion as retail property. At September 30, 2017, approximately $339 million, or 18%, of the retail CRE loans are secured by regional shopping centers.

Underwriting on commercial properties is primarily based on the economic viability of the project with heavy consideration given to the creditworthiness and experience of the sponsor. We generally require that the owner’s equity be injected prior to bank advances. Remargining requirements (required equity infusions upon a decline in value or cash flow of the collateral) are often included in the loan agreement along with guarantees of the sponsor. Recognizing that debt is paid via cash flow, the projected cash flows of the project are critical in the underwriting because these determine the ultimate value of the property and its ability to service debt. Therefore, in most projects (with the exception of multifamily and hospitality construction projects), we require substantial pre-leasing/leasing in our underwriting and we generally require a minimum projected stabilized debt service coverage ratio of 1.20 or higher, depending on the project asset class.

Within the residential construction and development sector, many of the requirements previously mentioned, such as creditworthiness and experience of the developer, up-front injection of the developer’s equity, principal curtailment requirements, and the viability of the project are also important in underwriting a residential development loan. Significant consideration is given to the forecasted market acceptance of the product, location, strength of the developer, and the ability of the developer to stay within budget. Progress inspections by qualified independent inspectors are routinely performed before disbursements are made.

Real estate appraisals are ordered in accordance with regulatory guidelines and are validated independent of the loan officer and the borrower, generally by our internal appraisal review function, which is staffed by licensed appraisers. In some cases, reports from automated valuation services are used or internal evaluations are performed. A new appraisal or evaluation is required when a loan deteriorates to a certain level of credit weakness.

Advance rates (i.e., loan commitments) will vary based on the viability of the project and the creditworthiness of the sponsor, but our guidelines generally limit advances to 50% for raw land, 65% for land development, 65% for finished commercial lots, 75% for finished residential lots, 80% for pre-sold homes, 75% for models and homes not under contract, and 75% for commercial properties. Exceptions may be granted on a case-by-case basis.

Loan agreements require regular financial information on the project and the sponsor in addition to lease schedules, rent rolls and, on construction projects, independent progress inspection reports. The receipt of this financial information is monitored and calculations are made to determine adherence to the covenants set forth in the loan agreement.

The existence of a guarantee that improves the likelihood of repayment is taken into consideration when analyzing CRE loans for impairment. If the support of the guarantor is quantifiable and documented, it is included in the potential cash flows and liquidity available for debt repayment, and our impairment methodology takes this repayment source into consideration.

When we modify or extend a loan, we also give consideration to whether the borrower is in financial difficulty, and whether we have granted a concession. In determining if an interest rate concession has been granted, we consider whether the interest rate on the modified loan is equivalent to current market rates for new debt with similar risk characteristics. If the rate in the modification is less than current market rates, it may indicate that a concession was granted and impairment exists. However, if additional collateral is obtained, or if a guarantor exists who has

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capacity and willingness to support the loan on an extended basis, we also consider the nature and amount of the additional collateral and guarantees in the ultimate determination of whether a concession has been granted.

In general, we obtain and consider updated financial information for the guarantor as part of our determination to extend a loan. The quality and frequency of financial reporting collected and analyzed varies depending on the contractual requirements for reporting, the size of the transaction, and the strength of the guarantor.

Complete underwriting of the guarantor includes, but is not limited to, an analysis of the guarantor’s current financial statements, leverage, liquidity, global cash flow, global debt service coverage, contingent liabilities, etc. The assessment also includes a qualitative analysis of the guarantor’s willingness to perform in the event of a problem and demonstrated history of performing in similar situations. Additional analysis may include personal financial statements, tax returns, liquidity (brokerage) confirmations, and other reports, as appropriate.

A qualitative assessment is performed on a case-by-case basis to evaluate the guarantor’s experience, performance track record, reputation, and willingness to work with us. We also utilize market information sources, rating, and scoring services in our assessment. This qualitative analysis coupled with a documented quantitative ability to support the loan may result in a higher-quality internal loan grade, which may reduce the level of allowance we estimate. Previous documentation of the guarantor’s financial ability to support the loan is discounted if there is any indication of a lack of willingness by the guarantor to support the loan.

In the event of default, we evaluate the pursuit of any and all appropriate potential sources of repayment, which may come from multiple sources, including the guarantee. A number of factors are considered when deciding whether or not to pursue a guarantor, including, but not limited to, the value and liquidity of other sources of repayment (collateral), the financial strength and liquidity of the guarantor, possible statutory limitations (e.g., single action rule on real estate) and the overall cost of pursuing a guarantee compared with the ultimate amount we may be able to recover. In other instances, the guarantor may voluntarily support a loan without any formal pursuit of remedies.

A decrease in oil and gas prices could potentially produce an adverse impact on our CRE loan portfolio within Texas. However, based upon generally strong equity and cash flow coverage levels, and sponsor support for the various properties, we do not expect a material amount of losses within this portfolio for the remainder of 2017. Our largest CRE credit exposures in Texas are to the multi-family, office, and retail sectors. As of September 30, 2017, the CRE loan portfolio mix in Texas is 68% commercial term, 19% commercial construction, 10% residential construction, and 3% land development.

Consumer Loans

We have mainly been an originator of first and second mortgages, generally considered to be of prime quality. We generally hold variable-rate loans in our portfolio and sell “conforming” fixed-rate loans to third parties, including Federal National Mortgage Association and Federal Home Loan Mortgage Corporation, for which we make representations and warranties that the loans meet certain underwriting and collateral documentation standards.

We are engaged in Home Equity Credit Line (“HECL”) lending. At September 30, 2017, our HECL portfolio totaled $2.7 billion, compared with $2.6 billion at December 31, 2016. The following schedule describes the composition of our HECL portfolio by lien status.

HECL PORTFOLIO BY LIEN STATUS

(In millions)	September 30, 2017		December 31, 2016
Secured by first deeds of trust	$	1,396	$	1,383
Secured by second (or junior) liens	1,349		1,262
Total	$	2,745	$	2,645

At September 30, 2017, loans representing approximately 1% of the outstanding balance in the HECL portfolio were estimated to have combined loan-to-value ratios (“CLTV”) above 100%. An estimated CLTV ratio is the ratio of our loan plus any prior lien amounts divided by the estimated current collateral value. At origination,

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underwriting standards for the HECL portfolio generally include a maximum 80% CLTV with high credit scores at origination.

Approximately 91% of our HECL portfolio is still in the draw period, and approximately 24% of those loans are scheduled to begin amortizing within the next five years. We regularly analyze the risk of borrower default in the event of a loan becoming fully amortizing and the risk of higher interest rates. The analysis indicates that the risk of loss from this factor is minimal in the current economic environment. The ratio of net charge-offs to average balances for the first nine months of 2017 and 2016 for the HECL portfolio was (0.01)% and 0.02%, respectively. See Note 6 of the Notes to Consolidated Financial Statements for additional information on the credit quality of this portfolio.

Nonperforming Assets

Nonperforming assets as a percentage of loans and leases and other real estate owned decreased to 1.06% at September 30, 2017, compared with 1.34% at December 31, 2016.

Total nonaccrual loans at September 30, 2017 decreased $104 million from December 31, 2016, primarily in the commercial and industrial loan portfolio. However, nonaccrual loans slightly increased in the commercial owner-occupied and commercial real estate term loan portfolios. The largest total decrease in nonaccrual loans occurred at Amegy.

The balance of nonaccrual loans can decrease due to paydowns, charge-offs, and the return of loans to accrual status under certain conditions. If a nonaccrual loan is refinanced or restructured, the new note is immediately placed on nonaccrual. If a restructured loan performs under the new terms for at least a period of six months, the loan can be considered for return to accrual status. See “Restructured Loans” following for more information. Company policy does not allow for the conversion of nonaccrual construction and land development loans to CRE term loans. See Note 6 of the Notes to Consolidated Financial Statements for more information on nonaccrual loans.

The following schedule sets forth our nonperforming assets:

NONPERFORMING ASSETS

(Dollar amounts in millions)	September 30, 2017			December 31, 2016
Nonaccrual loans 1	$	465		$	569
Other real estate owned	3			4
Total nonperforming assets	$	468		$	573
Ratio of nonperforming assets to net loans and leases1 and other real estate owned	1.06		%	1.34		%
Accruing loans past due 90 days or more	$	30		$	36
Ratio of accruing loans past due 90 days or more to loans and leases1	0.07		%	0.08		%
Nonaccrual loans and accruing loans past due 90 days or more	$	495		$	605
Ratio of nonaccrual loans and accruing loans past due 90 days or more to loans and leases1	1.12		%	1.41		%
Accruing loans past due 30-89 days	$	99		$	126
Nonaccrual loans1 current as to principal and interest payments	57		%	74		%

¹ Includes loans held for sale.

Restructured Loans

Troubled debt restructurings (“TDRs”) are loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for whom we have granted a concession that we would not otherwise consider. TDRs decreased $3 million, or 1.2%, during the first nine months of 2017. Commercial loans may be modified to provide the borrower more time to complete the project, to achieve a higher lease-up percentage, to sell the property, or for other reasons. Consumer loan TDRs represent loan modifications in which a concession has been granted to the borrower who is unable to refinance the loan with another lender, or who is experiencing economic hardship. Such consumer loan TDRs may include first-lien residential mortgage loans and home equity loans.

If the restructured loan performs for at least six months according to the modified terms, and an analysis of the customer’s financial condition indicates that we are reasonably assured of repayment of the modified principal and interest, the loan may be returned to accrual status. The borrower’s payment performance prior to and following the restructuring is taken into account to determine whether a loan should be returned to accrual status.

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ACCRUING AND NONACCRUING TROUBLED DEBT RESTRUCTURED LOANS

(In millions)	September 30, 2017		December 31, 2016
Restructured loans – accruing	$	133	$	151
Restructured loans – nonaccruing	115		100
Total	$	248	$	251

In the periods following the calendar year in which a loan was restructured, a loan may no longer be reported as a TDR if it is on accrual, is in compliance with its modified terms, and yields a market rate (as determined and documented at the time of the modification or restructure). See Note 6 of the Notes to Consolidated Financial Statements for additional information regarding TDRs.

TROUBLED DEBT RESTRUCTURED LOANS ROLLFORWARD

	Three Months Ended September 30,						Nine Months Ended September 30,
(In millions)	2017			2016			2017			2016
Balance at beginning of period	$	304		$	315		$	251		$	297
New identified TDRs and principal increases	7			40			163			142
Payments and payoffs	(45		)	(35		)	(117		)	(107		)
Charge-offs	(4		)	(24		)	(17		)	(29		)
No longer reported as TDRs	—			—			(4		)	(7		)
Sales and other	(14		)	(1		)	(28		)	(1		)
Balance at end of period	$	248		$	295		$	248		$	295

Allowance for Credit Losses

In analyzing the adequacy of the ALLL, we utilize a comprehensive loan grading system to determine the risk potential in the portfolio and also consider the results of independent internal credit reviews. To determine the adequacy of the allowance, our loan and lease portfolio is broken into segments based on loan type.

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The following schedule shows the changes in the allowance for loan losses and a summary of loan loss experience:

SUMMARY OF LOAN LOSS EXPERIENCE

(Dollar amounts in millions)	Nine Months Ended September 30, 2017			Twelve Months Ended December 31, 2016			Nine Months Ended September 30, 2016
Loans and leases outstanding (net of unearned income)	$	44,156		$	42,649		$	42,540
Average loans and leases outstanding (net of unearned income)	$	43,218		$	42,062		$	41,868
Allowance for loan losses:
Balance at beginning of period	$	567		$	606		$	606
Provision charged to earnings	35			93			95
Charge-offs:
Commercial	(98		)	(170		)	(138		)
Commercial real estate	(6		)	(12		)	(10		)
Consumer	(13		)	(16		)	(11		)
Total	(117		)	(198		)	(159		)
Recoveries:
Commercial	36			43			36
Commercial real estate	12			14			12
Consumer	8			9			7
Total	56			66			55
Net loan and lease charge-offs	(61		)	(132		)	(104		)
Balance at end of period	$	541		$	567		$	597
Ratio of annualized net charge-offs to average loans and leases	0.19		%	0.31		%	0.33		%
Ratio of allowance for loan losses to net loans and leases, at period end	1.23		%	1.33		%	1.40		%
Ratio of allowance for loan losses to nonaccrual loans, at period end	120		%	107		%	103		%
Ratio of allowance for loan losses to nonaccrual loans and accruing loans past due 90 days or more, at period end	112		%	100		%	98		%

The total ALLL decreased during the first nine months of 2017 by $26 million as a result of credit quality improvements in the total loan portfolio.

The RULC represents a reserve for potential losses associated with off-balance-sheet commitments and standby letters of credit. The reserve is separately shown in the balance sheet and any related increases or decreases in the reserve are shown separately in the statement of income. At September 30, 2017, the reserve decreased by $6 million compared with December 31, 2016, also as a result of credit quality improvements in the total loan portfolio, and decreased by $3 million from September 30, 2016.

See Note 6 of the Notes to Consolidated Financial Statements for additional information related to the ACL and credit trends experienced in each portfolio segment.

Interest Rate and Market Risk Management

Interest rate and market risk are managed centrally. Interest rate risk is the potential for reduced net interest income and other rate sensitive income resulting from adverse changes in the level of interest rates. Market risk is the potential for loss arising from adverse changes in the fair value of fixed income securities, equity securities, other earning assets, and derivative financial instruments as a result of changes in interest rates or other factors. As a financial institution that engages in transactions involving an array of financial products, we are exposed to both interest rate risk and market risk.

The Company’s Board of Directors is responsible for approving the overall policies relating to the management of the financial risk of the Company, including interest rate and market risk management. The Board has established the Asset/Liability Committee (“ALCO”) consisting of members of management, to which it has delegated the

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responsibility of managing interest rate and market risk for the Company. ALCO establishes and periodically revises policy limits and reviews with the ROC the limits and limit exceptions reported by management.

Interest Rate Risk

Interest rate risk is one of the most significant risks to which we are regularly exposed. In general, our goal in managing interest rate risk is to manage balance sheet sensitivity to reduce net income volatility due to changes in interest rates.

Over the course of the last year, we have actively reduced the level of asset sensitivity through the purchase of short-to-medium duration agency pass-through securities and funding these purchases by reducing money market investments and increasing short-term borrowings. This repositioning of the investment portfolio has increased current net interest income while dampening the impact of higher rates on net interest income growth. We continue to anticipate higher net interest income in a rising rate environment as our assets reprice more quickly than our liabilities.

As most of our liabilities are comprised of indeterminate maturity and managed rate deposits, behavioral assumptions for these deposits have a significant impact on our projected interest rate risk. We have historically reported two sets of deposit assumptions, fast and slow, to reflect the uncertainty of deposit behavior and its impact on interest rate risk. We have recently updated our deposit models and now disclose interest rate risk for only a single set of deposit behavioral assumptions. The newly implemented method differs from prior methods primarily in the way we treat commercial checking deposits and in the manner by which we determine the portion of deposits that are core deposits. For commercial checking deposits, we have separated the balances into a core amount that is operational or that compensates for billed services, and a complementary excess balance. The excess balance is modeled with a high attrition rate, whereas the core balance runs off more slowly. For other deposit types, the core balance is determined by the average balance over a longer-term horizon, typically 24 to 48 months, and excess balances are modeled with a high attrition rate.

Interest Rate Risk Measurement

We monitor interest rate risk through the use of two complementary measurement methods: net interest income simulation, or Earnings at Risk (“EaR”), and Economic Value of Equity at Risk (“EVE”). Earnings at Risk analyzes the expected change in net interest income in response to changes in interest rates. In the EVE method, we measure the expected changes in the fair value of equity in response to changes in interest rates.

Earnings at Risk is an estimate of the change in total net interest income that would be recognized under different rate environments. Earnings at Risk is measured assuming several parallel and nonparallel interest rate shifts across the yield curve, taking into account deposit repricing assumptions and estimates of the possible exercise of embedded options within the portfolio (e.g., a borrower’s ability to refinance a loan under a lower rate environment). Our policy contains a trigger for a 10% decline in rate sensitive income as well as a risk capacity of a 13% decline if rates were to immediately rise or fall in parallel by 200 bps.

EVE is calculated as the fair value of all assets minus the fair value of liabilities. We measure changes in the dollar amount of EVE for parallel shifts in interest rates. Due to embedded optionality and asymmetric rate risk, changes in EVE can be useful in quantifying risks not apparent for small rate changes. Examples of such risks may include out-of-the-money interest rate caps (or limits) on loans, which have little effect under small rate movements but may become important if large rate changes were to occur, or substantial prepayment deceleration for low-rate mortgages in a higher-rate environment. Our policy contains a trigger for an 8% decline in EVE as well as a risk capacity of a 10% decline if rates were to immediately rise or fall in parallel by 200 bps. Exceptions to the EVE limits are subject to notification and approval by the ROC.

Estimating the impact on net interest income and EVE requires that we assess a number of variables and make various assumptions in managing our exposure to changes in interest rates. The assessments address deposit withdrawals and deposit product migration (e.g., customers moving money from checking accounts to certificates of deposit), competitive pricing (e.g., existing loans and deposits are assumed to roll into new loans and deposits at

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similar spreads relative to benchmark interest rates), loan and security prepayments, and the effects of other similar embedded options. As a result of uncertainty about the maturity and repricing characteristics of both deposits and loans, we also calculate the sensitivity of EaR and EVE results to key assumptions. The modeled results are highly sensitive to the assumptions used for deposits that do not have specific maturities, such as checking, savings and money market accounts, and also to prepayment assumptions used for loans with prepayment options. We use historical regression analysis as a guide to setting such assumptions; however, due to the current low interest rate environment, which has little historical precedent, estimated deposit behavior may not reflect actual future results. Additionally, competition for funding in the marketplace has and may again result in changes to deposit pricing on interest-bearing accounts that are greater or less than changes in benchmark interest rates such as LIBOR or the federal funds rate.

Under most rising interest rate environments, we would expect some customers to move balances from demand deposits to interest-bearing accounts such as money market, savings, or CDs. The models are particularly sensitive to the assumption about the rate of such migration.

In addition, we assume certain correlation rates, often referred to as a “deposit beta,” of interest-bearing deposits, wherein the rates paid to customers change at a different pace when compared to changes in benchmark interest rates. Generally, certificates of deposit are assumed to have a high correlation rate, while interest-on-checking accounts are assumed to have a lower correlation rate. Actual results may differ materially due to factors including competitive pricing, money supply, credit worthiness of the Company, and so forth; however, we use our historical experience as well as industry data to inform our assumptions.

The aforementioned migration and correlation assumptions result in deposit durations presented in the following schedule.

DEPOSIT ASSUMPTIONS

	September 30, 2017
	New Deposit Method
Product	Effective duration (unchanged)		Effective duration (+200 bps)
Demand deposits	3.3	%	3.3	%
Money market	1.5	%	1.3	%
Savings and interest-on-checking	2.7	%	2.4	%

As of the dates indicated and incorporating the assumptions previously described, the following schedule shows EaR, or percentage change in net interest income, based on a static balance sheet size, in the first year after the interest rate change if interest rates were to sustain immediate parallel changes ranging from -100 bps to +300 bps.

EARNINGS AT RISK – CHANGE IN NET INTEREST INCOME

	September 30, 2017
	Parallel shift in rates (in bps)1
Repricing scenario	-100		0		+100		+200		+300
Earnings at Risk	(3.8	)%	—	%	2.9	%	5.8	%	8.5	%

¹  Assumes rates cannot go below zero in the negative rate shift.

For non-maturity interest bearing deposits, the weighted average modeled beta is 36%. If the weighted average deposit beta increased to 46% it would decrease the EaR in the +200bp shock from 5.8% to 3.3%.

The EaR analysis focuses on parallel rate shocks across the term structure of rates. The yield curve typically does not move in a parallel manner. During the past year, an increase in short-term rates has led to a flatter yield curve as longer-term rates have not increased at the same pace as short-term rates. If we consider a flattening rate shock

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where the short-term rate moves +200bp but the ten-year rate only moves +30bp, the increase in earnings is 31% lower over 12 months compared with the parallel +200bp rate shock.

For comparative purposes, the December 31, 2016 measures as presented in the following schedule have been recalculated using the new methodology.

	December 31, 2016
	Parallel shift in rates (in bps)1
Repricing scenario	-100		0		+100		+200		+300
Earnings at Risk	(4.9	)%	—	%	3.6	%	7.6	%	11.5	%

¹  Assumes rates cannot go below zero in the negative rate shift.

The asset sensitivity as measured by EaR declined due to continued purchases of medium-term securities funded through reductions in money market investments and increases in short-term borrowings.

CHANGES IN ECONOMIC VALUE OF EQUITY

As of the dates indicated and incorporating the assumptions previously described, the following schedule shows our estimated percentage change in EVE under parallel interest rate changes ranging from -100 bps to +300 bps. For non-maturity interest bearing deposits, the weighted average modeled beta is 36%. If the weighted average deposit beta increased to 46% it would decrease the EVE in the +200bp shock from 1.1% to -1.4%.

	September 30, 2017
	Parallel shift in rates (in bps)1
Repricing scenario	-100		0		+100		+200		+300
Economic Value of Equity	1.6	%	—	%	0.8	%	1.1	%	1.3	%

¹  Assumes rates cannot go below zero in the negative rate shift.

For comparative purposes, the December 31, 2016 measures as presented in the following schedule have been recalculated using the new methodology. The changes in EVE measures are driven by the same factors as those in our income simulation.

	December 31, 2016
	Parallel shift in rates (in bps)1
Repricing scenario	-100 bps		0 bps		+100 bps		+200 bps		+300 bps
Economic Value of Equity	0.3	%	—	%	1.2	%	2.9	%	4.9	%

¹  Assumes rates cannot go below zero in the negative rate shift.

Our focus on business banking also plays a significant role in determining the nature of the Company’s asset-liability management posture. At September 30, 2017, $19.7 billion of the Company’s commercial lending and CRE loan balances were scheduled to reprice in the next six months. Of these variable-rate loans approximately 65% are tied to either the prime rate or LIBOR. For these variable-rate loans we have executed $1.1 billion of cash flow hedges by receiving fixed rates on interest rate swaps. Additionally, asset sensitivity is reduced due to $0.3 billion of variable-rate loans being priced at floored rates at September 30, 2017, which were above the “index plus spread” rate by an average of 45 bps. At September 30, 2017, we also had $3.2 billion of variable-rate consumer loans scheduled to reprice in the next six months. Of these variable-rate consumer loans approximately $0.2 billion were priced at floored rates, which were above the “index plus spread” rate by an average of 32 bps.

See Notes 3 and 7 of the Notes to Consolidated Financial Statements and Notes 7 and 20 of our 2016 Annual Report on Form 10-K for additional information regarding derivative instruments.

Market Risk – Fixed Income

We engage in the underwriting and trading of municipal securities. This trading activity exposes us to a risk of loss arising from adverse changes in the prices of these fixed income securities.

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At September 30, 2017, we had a relatively small amount, $56 million, of trading assets and $49 million of securities sold, not yet purchased, compared with $115 million and $25 million, respectively, at December 31, 2016.

We are exposed to market risk through changes in fair value. We are also exposed to market risk for interest rate swaps used to hedge interest rate risk. Changes in the fair value of AFS securities and in interest rate swaps that qualify as cash flow hedges are included in accumulated other comprehensive income (“AOCI”) for each financial reporting period. During the third quarter of 2017, the after-tax change in AOCI attributable to AFS securities decreased by $47 million, due largely to changes in the interest rate environment, compared with a $11 million decrease in the same prior year period.

Market Risk – Equity Investments

Through our equity investment activities, we own equity securities that are publicly traded. In addition, we own equity securities in companies and governmental entities, e.g., the Federal Reserve Bank and an FHLB, that are not publicly traded. The accounting for equity investments may use the cost, fair value, equity, or full consolidation methods of accounting, depending on our ownership position and degree of involvement in influencing the investees’ affairs. Regardless of the accounting method, the value of our investment is subject to fluctuation. Because the fair value of these securities may fall below our investment costs, we are exposed to the possibility of loss. Equity investments in private and public companies are approved, monitored and evaluated by the Company’s Equity Investment Committee consisting of members of management.

We hold both direct and indirect investments in predominantly pre-public companies, primarily through various Small Business Investment Company (“SBIC”) venture capital funds. Our equity exposure to these investments was approximately $123 million and $124 million at September 30, 2017 and December 31, 2016, respectively. On occasion, some of the companies within our SBIC investments may issue an initial public offering. In this case, the fund is generally subject to a lockout period before liquidating the investment which can introduce additional market risk. During the third quarter of 2017 we sold the remaining amount of our most significant publicly traded direct investment and as of September 30, 2017 we had an insignificant amount of publicly traded stocks as part of our direct SBIC investments.

Additionally, Amegy has an alternative investments portfolio. These investments are primarily directed towards equity buyout and mezzanine funds with a key strategy of deriving ancillary commercial banking business from the portfolio companies. Early stage venture capital funds are generally not a part of the strategy because the underlying companies are typically not creditworthy. The carrying value of Amegy’s equity investments was $12 million at September 30, 2017 and $13 million at December 31, 2016.

These PEIs are subject to the provisions of the Dodd-Frank Act. The Volcker Rule of the Dodd-Frank Act prohibits banks and bank holding companies from holding PEIs, except for SBIC funds and certain other permitted exclusions, beyond a required deadline. The Federal Reserve Board (“FRB”) announced in December 2016 that it would allow banks to apply for an additional five-year extension beyond the July 21, 2017 deadline to comply with the Dodd-Frank Act requirement for these investments. The Company applied for and was granted an extension for its eligible PEIs. All positions in the remaining portfolio of PEIs are subject to the extended deadline or other applicable exclusions.

As of September 30, 2017, such prohibited PEIs amounted to $4 million, with an additional $4 million of unfunded commitments (see Note 5 of the Notes to Consolidated Financial Statements for more information). We currently do not believe that this divestiture requirement will ultimately have a material impact on our financial statements.

Liquidity Risk Management

Overview

Liquidity risk is the possibility that our cash flows may not be adequate to fund our ongoing operations and meet our commitments in a timely and cost-effective manner. Since liquidity risk is closely linked to both credit risk and market risk, many of the previously discussed risk control mechanisms also apply to the monitoring and management of liquidity risk. We manage our liquidity to provide adequate funds for our customers’ credit needs,

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our capital plan actions and our anticipated financial and contractual obligations which include withdrawals by depositors, debt and capital service requirements, and lease obligations. The management of liquidity and funding is performed centrally for the Parent and jointly by the Parent and bank management for its subsidiary bank.

Overseeing liquidity management is the responsibility of ALCO, which implements a Board-approved corporate Liquidity and Funding Policy. This policy addresses monitoring and maintaining adequate liquidity, diversifying funding positions, and anticipating future funding needs. The policy also includes liquidity ratio guidelines, such as the “time-to-required funding” and LCR, that are used to monitor the liquidity positions of the Parent and ZB, N.A., as well as various stress test and liquid asset measurements for the Parent and ZB, N.A.

The Company has adopted policy limits that govern liquidity risk. The policy requires the Company to maintain a buffer of highly liquid assets sufficient to cover cash outflows in the event of a severe liquidity crisis. The Company targets a buffer of highly liquid assets at the Parent to cover 18-24 months of cash outflows under a scenario with limited cash inflows, and maintains a minimum policy limit of not less than 12 months. Throughout the first nine months of 2017 and as of September 30, 2017, the Company complied with this policy. More information regarding the Company’s liquidity risk management process is contained in “Liquidity Risk Management” under “Overview” in our 2016 Annual Report on Form 10-K.

Liquidity Regulation

In September 2014, U.S. banking regulators issued a final rule that implements a quantitative liquidity requirement in the U.S. generally consistent with the LCR minimum liquidity measure established under the Basel III liquidity framework. Under this rule, we are subject to a modified LCR standard, which requires a financial institution to hold an adequate amount of unencumbered High-Quality-Liquid Assets (“HQLA”) that can be converted into cash easily and immediately in private markets to meet its liquidity needs for a short-term liquidity stress scenario. This rule became applicable to us on January 1, 2016.

The Basel III liquidity framework includes a second minimum liquidity measure, the Net Stable Funding Ratio (“NSFR”), which requires a financial institution to maintain a stable funding profile over a one-year period in relation to the characteristics of its on- and off-balance sheet activities. On October 31, 2014, the Basel Committee on Banking Supervision issued its final standards for this ratio, entitled Basel III: The Net Stable Funding Ratio. On May 3, 2016, the FRB issued a proposal requiring bank holding companies with less than $250 billion of assets, but more than $50 billion of assets, to cover 70% of 1-year cash outflows under the assumptions required in the proposed NSFR Rule. Under the proposal, bank holding companies would be required to publicly disclose information about the NSFR levels each quarter. The proposal has an effective date of January 1, 2018. We continue to monitor this proposal and any other developments. Based on this Basel III publication and the FRB proposal, we believe we would meet the minimum NSFR if such requirement were currently effective.

The Enhanced Prudential Standards for liquidity management (Reg. YY) require us to conduct monthly liquidity stress tests. These tests incorporate scenarios designed by us, require a buffer of highly liquid assets sufficient to cover 30-day funding needs under the stress scenarios, and are subject to review by the FRB. The Company’s internal liquidity stress-testing program as contained in its policy complies with these requirements and includes monthly liquidity stress testing using a set of internally generated scenarios representing severe liquidity constraints over a 12-month horizon.

Liquidity Management Actions

Consolidated cash, interest-bearing deposits held as investments, and security resell agreements at the Parent and its subsidiaries was $1.7 billion at September 30, 2017 compared with $2.0 billion at June 30, 2017 and $2.5 billion at December 31, 2016. The $0.8 billion decrease during the first nine months of 2017 resulted primarily from (1) an increase in investment securities, (2) net loan originations and purchases, (3) a net decrease in deposits, (4) repurchase of our common stock, (5) repayment of long-term debt, (6) repurchase and redemption of our preferred stock, and (7) dividends on common and preferred stock. These decreases were partially offset by short-term FHLB borrowings and net cash provided by operating activities.

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During the first nine months of 2017, our HTM and AFS investment securities increased by $1.7 billion. This increase was primarily due to purchases of short-to-medium duration agency guaranteed mortgage-backed securities. Prior to the second quarter of 2017, we were adding to our investment portfolio during the past couple of years to increase our HQLA position in light of the new LCR rules and more broadly, to manage balance sheet liquidity more effectively. However, during the second and third quarters of 2017, our HTM and AFS investment securities decreased by $432 million, and we expect the size of the investment portfolio to be generally stable during the next several quarters.

During the first nine months of 2017 we made cash payments totaling $153 million for our long-term debt which matured and did not incur any new long-term debt during the same time period. See Note 8 for additional detail about debt maturities. During the first nine months of 2017, we also increased our short-term debt with the FHLB by $2.8 billion, and had $3.3 billion outstanding as of September 30, 2017.

Parent Company Liquidity

The Parent’s cash requirements consist primarily of debt service, investments in and advances to subsidiaries, operating expenses, income taxes, and dividends to preferred and common shareholders. The Parent’s cash needs are usually met through dividends from its subsidiaries, interest and investment income, subsidiaries’ proportionate shares of current income taxes, and long-term debt and equity issuances.

Cash and interest-bearing deposits held as investments at the Parent decreased to $0.3 billion at September 30, 2017 compared with $0.4 billion at June 30, 2016 and $0.5 billion at December 31, 2016. This $0.2 billion decrease for the first nine months of 2017 resulted primarily from (1) repurchase of our common stock, (2) repayment of long-term debt, (3) repurchase and redemption of our preferred stock and (4) dividends on our common and preferred stock. This decrease in cash was partially offset by common dividends and return of common equity and preferred dividends received by the parent from its subsidiary bank.

At September 30, 2017, maturities of our long-term senior and subordinated debt ranged from June 2023 to September 2028.

During the first nine months of 2017, the Parent received common dividends and return of common equity totaling $384 million and dividends on preferred stock totaling $39 million. During the first nine months of 2016, our subsidiary bank accrued $125 million of common dividends and return of common equity that has since been paid to the Parent and did not receive dividends on its preferred stock. At September 30, 2017, ZB, N.A. had approximately $453 million available for the payment of dividends to the parent under current capital regulations. The dividends that ZB, N.A. can pay are restricted by current and historical earning levels, retained earnings, and risk-based and other regulatory capital requirements and limitations.

General financial market and economic conditions impact our access to, and cost of, external financing. Access to funding markets for the Parent and its subsidiary bank is also directly affected by the credit ratings received from various rating agencies. The ratings not only influence the costs associated with the borrowings, but can also influence the sources of the borrowings. The debt ratings and outlooks issued by the various rating agencies for the Company and ZB, N.A. did not change during the first nine months of 2017, except S&P and Kroll upgraded their outlooks for both the Parent and ZB, N.A. from Stable to Positive. The credit rating agencies all rate the Parent’s and ZB, N.A.’s senior debt at an investment-grade level. In addition, Kroll rates the Company’s subordinated debt at an investment-grade level, while S&P rates the Company’s subordinated debt as noninvestment-grade.

36

ZIONS BANCORPORATION AND SUBSIDIARIES

The following schedule presents the Parent’s balance sheets as of September 30, 2017, December 31, 2016, and September 30, 2016.

PARENT ONLY CONDENSED BALANCE SHEETS
(In millions)	September 30, 2017			December 31, 2016			September 30, 2016
ASSETS
Cash and due from banks	$	2		$	2		$	—
Interest-bearing deposits	331			529			415
Investment securities:
Available-for-sale, at fair value	37			40			41
Other noninterest-bearing investments	35			29			29
Investments in subsidiaries:
Commercial bank	7,697			7,570			7,617
Other subsidiaries	6			6			81
Other assets	73			81			153
Total assets	$	8,181		$	8,257		$	8,336
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other liabilities	$	38		$	89		$	87
Subordinated debt to affiliated trusts	—			—			36
Long-term debt:
Due to others	382			534			534
Total liabilities	420			623			657
Shareholders’ equity:
Preferred stock	566			710			709
Common stock	4,552			4,725			4,748
Retained earnings	2,700			2,321			2,212
Accumulated other comprehensive income (loss)	(57		)	(122		)	10
Total shareholders’ equity	7,761			7,634			7,679
Total liabilities and shareholders’ equity	$	8,181		$	8,257		$	8,336

The Parent’s cash payments for interest, reflected in operating expenses, decreased to $16 million during the first nine months of 2017 from $25 million during the first nine months of 2016 due to the maturity and repayment of debt during 2017 and 2016. Additionally, the Parent paid approximately $89 million of total dividends on preferred stock and common stock for the first nine months of 2017 compared to $81 million for the first nine months of 2016.

Subsidiary Bank Liquidity

ZB, N.A.’s primary source of funding is its core deposits, consisting of demand, savings and money market deposits, and time deposits under $250,000. On a consolidated basis, the Company’s loan to total deposit ratio was 84.8% at September 30, 2017 compared with 83.4% at June 30, 2017 and 80.1% at December 31, 2016, reflecting loan growth and a decrease in deposits during the first nine months of 2017.

Total deposits decreased by $1.1 billion to $52.1 billion at September 30, 2017, compared with $53.2 billion at December 31, 2016. This decrease was a result of a $1.2 billion decrease in savings and money market deposits and a $0.1 billion decrease in noninterest-bearing demand deposits. The decrease was partially offset by a $0.2 billion increase in time deposits. Also, during the first quarter of 2017, ZB, N.A. redeployed approximately $2.6 billion of cash to short-to-medium duration agency guaranteed mortgage-backed securities. ZB, N.A.’s long-term senior debt ratings were the same as the Parent, except Standard & Poor’s was BBB and Kroll’s was BBB+, compared to BBB- for Standard & Poor’s and BBB for Kroll for the Parent.

The FHLB system and Federal Reserve Banks have been and are a source of back-up liquidity, and from time to time, have been a significant source of funding. ZB, N.A. is a member of the FHLB of Des Moines. The FHLB

37

ZIONS BANCORPORATION AND SUBSIDIARIES

allows member banks to borrow against their eligible loans and securities to satisfy liquidity and funding requirements. The Bank is required to invest in FHLB and Federal Reserve stock to maintain their borrowing capacity.

At September 30, 2017, the amount available for additional FHLB and Federal Reserve borrowings was approximately $15.1 billion, compared with $17.1 billion at December 31, 2016. Loans with a carrying value of approximately $25.4 billion at September 30, 2017 have been pledged at the FHLB of Des Moines and the Federal Reserve as collateral for current and potential borrowings compared with $24.0 billion at December 31, 2016. At September 30, 2017, we had $3.3 billion of short-term FHLB borrowings outstanding and no long-term FHLB or Federal Reserve borrowings outstanding, compared with $500 million of short-term FHLB borrowings and no long-term FHLB or Federal Reserve borrowings outstanding at December 31, 2016. At September 30, 2017, our total investment in FHLB and Federal Reserve stock was $140 million and $184 million, respectively, compared with $30 million and $181 million at December 31, 2016.

Our investment activities can provide or use cash, depending on the asset-liability management posture taken. During the first nine months of 2017, HTM and AFS investment securities’ activities resulted in a net increase in investment securities and a net $2.1 billion decrease in cash, compared with a net $2.9 billion decrease in cash for the first nine months of 2016, reflecting our purchase of HQLA during the first quarter of 2017.

Maturing balances in ZB, N.A.’s loan portfolios also provide additional flexibility in managing cash flows. Lending and purchase activity for the first nine months of 2017 resulted in a net cash outflow of $1.5 billion compared with a net cash outflow of $2.0 billion for the first nine months of 2016.

A more comprehensive discussion of liquidity management, including certain contractual obligations, is contained in our 2016 Annual Report on Form 10-K.

Operational Risk Management

Operational risk is the risk to current or anticipated earnings or capital arising from inadequate or failed internal processes or systems, human errors or misconduct, or adverse external events. In our ongoing efforts to identify and manage operational risk, we have an ERM department whose responsibility is to help employees, management and the Board of Directors to assess, understand, measure, manage, and monitor risk in accordance with our Risk Appetite Framework. We have documented both controls and the Control Self-Assessment related to financial reporting under the 2013 framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”) and the FDICIA.

To manage and minimize our operational risk, we have in place transactional documentation requirements; systems and procedures to monitor transactions and positions; systems and procedures to detect and mitigate attempts to commit fraud, penetrate our systems or telecommunications, access customer data, and/or deny normal access to those systems to our legitimate customers; regulatory compliance reviews; and periodic reviews by the Company’s Compliance Risk Management, Internal Audit and Credit Examination departments. Reconciliation procedures have been established to ensure that data processing systems consistently and accurately capture critical data. In addition, the Data Governance department has key governance surrounding data integrity and availability. Further, we have key programs and procedures to maintain contingency and business continuity plans for operational support in the event of natural or other disasters. We also mitigate operational risk through the purchase of insurance, including errors and omissions and professional liability insurance.

We are continually improving our oversight of operational risk, including enhancement of risk identification, risk and control self-assessments, and antifraud measures, which are reported on a regular basis to enterprise management committees. The Operational Risk Committee reports to the ERMC, which reports to the ROC. Key measures have been established to increase oversight by ERM and Operational Risk Management through the strengthening of new initiative reviews, enhancements to the Enterprise Procurement and Third Party Risk Management framework, enhancements to the Business Continuity and Disaster Recovery programs and Enterprise Security programs, and the establishment of Fraud Risk Oversight, Incident Response Oversight and Technology

38

ZIONS BANCORPORATION AND SUBSIDIARIES

Project Oversight programs. Significant enhancements have also been made to governance, technology, and reporting, including the establishment of Policy and Committee Governance programs, the implementation of a governance, risk and control solution, and the creation of an Enterprise Risk Profile and an Operational Risk Profile along with business line risk profiles. In addition, the establishment of an Enterprise Exam Management department has standardized our response and reporting, and increased our effectiveness and efficiencies with regulatory examinations, communications and issues management.

The number and sophistication of attempts to disrupt or penetrate our critical systems, sometimes referred to as hacking, cyber fraud, cyber attacks, cyber terrorism, or other similar names, also continue to grow. On a daily basis, the Company, its customers, and other financial institutions are subject to a large number of such attempts. We have established systems and procedures to monitor, thwart or mitigate damage from such attempts. However, in some instances we, or our customers, have been victimized by cyber fraud (our related losses have not been material), or some of our customers have been temporarily unable to routinely access our online systems as a result of, for example, distributed denial of service attacks. We continue to review this area of our operations to help ensure that we manage this risk in an effective manner.

CAPITAL MANAGEMENT

We believe that a strong capital position is vital to continued profitability and to promoting depositor and investor confidence.

Capital Planning and Stress Testing

As a bank holding company (“BHC”) with assets greater than $50 billion, we are required by the Dodd-Frank Act to participate in annual stress tests known as the Dodd-Frank Act Stress Test (“DFAST”). In addition, we are required to participate in the Federal Reserve Board’s annual Comprehensive Capital Analysis and Review (“CCAR”), which is also recently referenced as the Horizontal Capital Review (“HCR”) for large and non-complex firms (generally, BHCs, with assets between $50 billion and $250 billion). In our capital plan, we are required to forecast, under a variety of economic scenarios, our estimated regulatory capital ratios, including our Common Equity Tier 1 ratio. Under the implementing regulations for CCAR, BHCs may generally raise and redeem capital, pay dividends, and repurchase stock and take similar capital-related actions only under a capital plan as to which the FRB has not objected. A detailed discussion of CCAR/DFAST requirements is contained on page 10 of the “Capital Plan and Stress Testing” section under Part 1, Item 1 in our 2016 Annual report on Form 10-K.

We submitted our stress test results and 2017 capital plan to the FRB on April 5, 2017. On June 28, 2017, the Board of Governors of the Federal Reserve System notified Zions Bancorporation that the Federal Reserve does not object to Zions Bancorporation’s Board-approved 2017 capital plan. Our capital plan for the period spanning July 1, 2017 through June 30, 2018 includes up to $465 million of common stock repurchases and approximately $140 million of common stock dividends as follows.

• Increasing the quarterly common dividend to $0.24 per share by the second quarter of 2018 following the path of:

◦ $0.12 per share in the third quarter of 2017

◦ $0.16 per share in the fourth quarter of 2017

◦ $0.20 per share in the first quarter of 2018

◦ $0.24 per share in the second quarter of 2018

Capital actions are subject to final approval by Zions Bancorporation’s board of directors, and may be influenced by, among other things, actual earnings performance, business needs and prevailing economic conditions.

On June 22, 2017, we filed a Form 8-K presenting the results of the 2017 DFAST exercise. The results of Zions’ published stress tests demonstrate that the Company believes it has sufficient capital to withstand a severe hypothetical economic downturn. Detailed disclosure of the stress test results can be found on our website.

On June 29, 2016, we filed a Form 8-K announcing that the FRB did not object to our 2016 capital plan (which spans the timeframe of July 31, 2016 to June 30, 2017). The plan included (1) the increase of the quarterly common

39

ZIONS BANCORPORATION AND SUBSIDIARIES

dividend to $0.08 per share beginning in the third quarter of 2016, (2) up to $180 million in total repurchases of common equity and (3) up to $144 million in total repurchases of preferred equity.

As planned, our quarterly dividend on common stock increased to $0.12 per share during the third quarter of 2017. The quarterly dividend had been $0.08 per share since the third quarter of 2016. The Company has repurchased $115 million of our common stock at an average price of $45.45 per share under the 2017 capital plan and $180 million of our common stock at an average price of $35.66 per share under the 2016 capital plan. The Company has $350 million of buyback capacity remaining in its 2017 capital plan.

Also in accordance with our 2016 capital plan, we redeemed all outstanding shares of our 7.9% Series F preferred stock on the redemption date of June 15, 2017. Note 8 contains additional information about the redemption.

Basel III

The Basel III capital rules became effective for the Company on January 1, 2015 (subject to phase-in periods for certain of their components). The Basel III capital rules will be fully phased in on January 1, 2019. In 2013, the FRB, FDIC, and OCC published final rules (the “Basel III Capital Rules”) establishing a new comprehensive capital framework for U.S. banking organizations. The rules implemented the Basel Committee’s December 2010 framework, commonly referred to as Basel III, for strengthening international capital standards as well as certain provisions of the Dodd-Frank Act.

A detailed discussion of Basel III requirements, including implications for the Company, is contained on page 9 in “Capital Standards – Basel Framework” under Part 1, Item 1 in our 2016 Annual Report on Form 10-K.

We met all capital adequacy requirements under the Basel III Capital Rules based upon phase-in rules as of September 30, 2017, and believe that we would meet all capital adequacy requirements on a fully phased-in basis if such requirements were currently effective.

Capital Management Actions

Total shareholders’ equity increased by $0.2 billion to $7.8 billion at September 30, 2017 from $7.6 billion at December 31, 2016. The increase in total shareholders’ equity is primarily due to net income of $469 million and a $65 million increase in the fair value of our AFS securities due largely to changes in the interest rate environment. These increases are partially offset by repurchases of our common stock under our buyback program totaling $205 million and $144 million paid to redeem our Series F preferred stock.

During the latter part of 2016, the market price of our common stock increased above the exercise price of common stock warrants on our common stock. As of September 2017, we have 5.8 million common stock warrants at an exercise price of $36.27 per share which expire on November 14, 2018 and 29.3 million common stock warrants at an exercise price of $35.61 per share which expire on May 22, 2020. The following schedule presents the diluted shares from common stock warrants at various Zions Bancorporation common stock market prices as of August 24, 2017, excluding the effect of future changes in exercise cost and warrant share multiplier from the payment of common stock dividends.

IMPACT OF COMMON STOCK WARRANTS

Assumed Zions Bancorporation Common Stock Market Price		Diluted Shares (000s)
$	35.00	0
40.00		4,590
45.00		8,070
50.00		10,854
55.00		13,132

40

ZIONS BANCORPORATION AND SUBSIDIARIES

We paid $57 million in dividends on common stock during the first nine months of 2017 compared with $41 million during the first nine months of 2016. During its October 2017 meeting, the Board of Directors declared a quarterly dividend of $0.16 per common share payable on November 22, 2017 to shareholders of record on November 15, 2017. We paid dividends on preferred stock of $32 million for the first nine months of 2017 compared to $40 million during the first nine months of 2016. See Note 8 for additional detail about capital management transactions during the first nine months of 2017.

Capital Ratios

Banking organizations are required by capital regulations to maintain adequate levels of capital as measured by several regulatory capital ratios. The following schedule shows the Company’s capital and performance ratios as of September 30, 2017, December 31, 2016, and September 30, 2016.

CAPITAL RATIOS

	September 30, 2017		December 31, 2016		September 30, 2016
Tangible common equity ratio1	9.57	%	9.49	%	9.91	%
Tangible equity ratio1	10.45	%	10.63	%	11.09	%
Average equity to average assets (three months ended)	11.93	%	12.48	%	12.81	%
Basel III risk-based capital ratios2:
Common equity tier 1 capital	12.22	%	12.07	%	12.04	%
Tier 1 leverage	10.58	%	11.09	%	11.27	%
Tier 1 risk-based	13.33	%	13.49	%	13.48	%
Total risk-based	14.99	%	15.24	%	15.31	%
Return on average common equity (three months ended)	8.3	%	7.1	%	6.7	%
Return on average tangible common equity (three months ended)1	9.8	%	8.4	%	7.9	%

¹  See “GAAP to Non-GAAP Reconciliations” on page 5 for more information regarding these ratios.

²  Based on the applicable phase-in periods.

At September 30, 2017, Basel III regulatory tier 1 risk-based capital and total risk-based capital was $6.8 billion and 7.7 billion, respectively, compared with $6.7 billion and $7.6 billion, respectively, at December 31, 2016. A more comprehensive discussion of our capital management is contained in our 2016 Annual Report on Form 10-K.

41

ITEM 1. FINANCIAL STATEMENTS (Unaudited)

ZIONS BANCORPORATION AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS
(In millions, shares in thousands)	September 30, 2017			December 31, 2016
	(Unaudited)
ASSETS
Cash and due from banks	$	541		$	737
Money market investments:
Interest-bearing deposits	765			1,411
Federal funds sold and security resell agreements	467			568
Investment securities:
Held-to-maturity, at amortized cost (approximate fair value $743 and $850)	746			868
Available-for-sale, at fair value	15,242			13,372
Trading account, at fair value	56			115
Total investment securities	16,044			14,355
Loans held for sale	71			172
Loans and leases, net of unearned income and fees	44,156			42,649
Less allowance for loan losses	541			567
Loans held for investment, net of allowance	43,615			42,082
Other noninterest-bearing investments	1,008			884
Premises, equipment and software, net	1,083			1,020
Goodwill	1,014			1,014
Core deposit and other intangibles	3			8
Other real estate owned	3			4
Other assets	950			984
Total Assets	$	65,564		$	63,239
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposits:
Noninterest-bearing demand	$	24,011		$	24,115
Interest-bearing:
Savings and money market	25,179			26,364
Time	2,909			2,757
Total deposits	52,099			53,236
Federal funds and other short-term borrowings	4,624			827
Long-term debt	383			535
Reserve for unfunded lending commitments	59			65
Other liabilities	638			942
Total liabilities	57,803			55,605
Shareholders’ equity:
Preferred stock, without par value, authorized 4,400 shares	566			710
Common stock, without par value; authorized 350,000 shares; issued and outstanding 199,712 and 203,085 shares	4,552			4,725
Retained earnings	2,700			2,321
Accumulated other comprehensive income (loss)	(57		)	(122		)
Total shareholders’ equity	7,761			7,634
Total liabilities and shareholders’ equity	$	65,564		$	63,239

See accompanying notes to consolidated financial statements.

42

ZIONS BANCORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (Unaudited)
(In millions, except shares and per share amounts)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest income:
Interest and fees on loans	$	468		$	437		$	1,370		$	1,291
Interest on money market investments	5			5			14			18
Interest on securities	84			49			246			143
Total interest income	557			491			1,630			1,452
Interest expense:
Interest on deposits	15			13			43			36
Interest on short- and long-term borrowings	20			9			48			30
Total interest expense	35			22			91			66
Net interest income	522			469			1,539			1,386
Provision for loan losses	5			19			35			95
Net interest income after provision for loan losses	517			450			1,504			1,291
Noninterest income:
Service charges and fees on deposit accounts	42			45			127			128
Other service charges, commissions and fees	55			54			160			156
Wealth management income	11			10			30			27
Loan sales and servicing income	6			11			19			29
Capital markets and foreign exchange	8			6			21			16
Customer-related fees	122			126			357			356
Dividends and other investment income	9			9			31			20
Securities gains, net	5			8			13			11
Other	3			2			3			1
Total noninterest income	139			145			404			388
Noninterest expense:
Salaries and employee benefits	253			242			756			742
Occupancy, net	35			33			101			93
Furniture, equipment and software, net	32			29			96			92
Other real estate expense, net	(1		)	—			(1		)	(2		)
Credit-related expense	7			7			23			19
Provision for unfunded lending commitments	(4		)	(3		)	(6		)	(13		)
Professional and legal services	14			14			42			38
Advertising	6			6			17			17
FDIC premiums	15			12			40			28
Amortization of core deposit and other intangibles	2			2			5			6
Other	54			61			159			161
Total noninterest expense	413			403			1,232			1,181
Income before income taxes	243			192			676			498
Income taxes	83			65			207			166
Net income	160			127			469			332
Preferred stock dividends	(8		)	(10		)	(30		)	(36		)
Preferred stock redemption	—			—			(3		)	(10		)
Net earnings applicable to common shareholders	$	152		$	117		$	436		$	286
Weighted average common shares outstanding during the period:
Basic shares (in thousands)	200,332			204,312			201,493			204,180
Diluted shares (in thousands)	209,106			204,714			209,366			204,425
Net earnings per common share:
Basic	$	0.75		$	0.57		$	2.14		$	1.39
Diluted	0.72			0.57			2.06			1.39

See accompanying notes to consolidated financial statements.

43

ZIONS BANCORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)
	Three Months Ended September 30,						Nine Months Ended September 30,
(In millions)	2017			2016			2017			2016
Net income for the period	$	160		$	127		$	469		$	332
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on investment securities	(8		)	(11		)	65			54
Net unrealized gains on other noninterest-bearing investments	—			2			2			2
Net unrealized holding gains (losses) on derivative instruments	—			(3		)	—			14
Reclassification adjustment for increase in interest income recognized in earnings on derivative instruments	—			(2		)	(2		)	(5		)
Pension and postretirement	—			—			—			(1		)
Other comprehensive income (loss)	(8		)	(14		)	65			64
Comprehensive income	$	152		$	113		$	534		$	396

See accompanying notes to consolidated financial statements.

44

ZIONS BANCORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (Unaudited)
(In millions, except shares and per share amounts)	Preferred stock			Common stock					Retained earnings			Accumulated other comprehensive income (loss)				Total shareholders’ equity
				Shares (in thousands)		Amount
Balance at December 31, 2016	$	710		203,085		$	4,725		$	2,321			$	(122	)	$	7,634
Net income for the period									469							469
Other comprehensive income, net of tax													65			65
Preferred stock redemption	(144		)			2			(2		)					(144		)
Company common stock repurchased				(4,689	)	(205		)								(205		)
Net activity under employee plans and related tax benefits				1,316		30										30
Dividends on preferred stock									(30		)					(30		)
Dividends on common stock, $0.28 per share									(58		)					(58		)
Balance at September 30, 2017	$	566		199,712		$	4,552		$	2,700			$	(57	)	$	7,761
Balance at December 31, 2015	$	828		204,417		$	4,767		$	1,967			$	(55	)	$	7,507
Net income for the period									332							332
Other comprehensive income, net of tax													64			64
Preferred stock redemption	(118		)			2			(10		)					(126		)
Company common stock repurchased				(1,469	)	(45		)								(45		)
Net activity under employee plans and related tax benefits				902		24										24
Dividends on preferred stock									(36		)					(36		)
Dividends on common stock, $0.20 per share									(41		)					(41		)
Change in deferred compensation									—							—
Balance at September 30, 2016	$	710		203,850		$	4,748		$	2,212			$	9		$	7,679

See accompanying notes to consolidated financial statements.

45

ZIONS BANCORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$	160		$	127		$	469		$	332
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	1			16			29			82
Depreciation and amortization	47			34			131			88
Share-based compensation	4			6			21			22
Deferred income tax expense (benefit)	(4		)	2			4			(9		)
Net decrease (increase) in trading securities	5			11			59			(60		)
Net decrease (increase) in loans held for sale	(18		)	(12		)	71			(9		)
Change in other liabilities	84			52			63			215
Change in other assets	(42		)	(4		)	(9		)	(222		)
Other, net	(10		)	(19		)	(35		)	(24		)
Net cash provided by operating activities	227			213			803			415
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	363			(389		)	748			3,563
Proceeds from maturities and paydowns of investment securities held-to-maturity	83			34			249			66
Purchases of investment securities held-to-maturity	(54		)	(35		)	(127		)	(235		)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	615			683			1,775			3,257
Purchases of investment securities available-for-sale	(535		)	(1,607		)	(4,001		)	(5,974		)
Net change in loans and leases	(475		)	(58		)	(1,511		)	(1,956		)
Net change in other noninterest-bearing investments	14			(26		)	(89		)	(29		)
Purchases of premises and equipment	(39		)	(51		)	(133		)	(143		)
Proceeds from sales of other real estate owned	3			6			7			15
Other, net	1			2			5			5
Net cash used in investing activities	(24		)	(1,441		)	(3,077		)	(1,431		)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	(278		)	575			(1,136		)	496
Net change in short-term funds borrowed	(718		)	845			1,297			768
Proceeds from debt over 90 days and up to one year	1,850			—			3,600			—
Repayments of debt over 90 days and up to one year	(850		)	—			(1,100		)	—
Cash paid for preferred stock redemption	—			—			(144		)	(126		)
Repayments of long-term debt	—			(129		)	(153		)	(244		)
Proceeds from the issuance of common stock	2			5			20			8
Dividends paid on common and preferred stock	(34		)	(31		)	(89		)	(81		)
Company common stock repurchased	(115		)	(45		)	(217		)	(51		)
Other, net	—			1			—			1
Net cash provided by (used in) financing activities	(143		)	1,221			2,078			771
Net increase (decrease) in cash and due from banks	60			(7		)	(196		)	(245		)
Cash and due from banks at beginning of period	481			560			737			798
Cash and due from banks at end of period	$	541		$	553		$	541		$	553
Cash paid for interest	$	27		$	18		$	79		$	61
Net cash paid for income taxes	84			53			206			154
Noncash activities are summarized as follows:
Loans held for investment transferred to other real estate owned	1			6			5			13
Loans held for investment reclassified to loans held for sale, net	1			40			14			36
Available-for-sale securities purchased, not settled	25			—			81			—
Held-to-maturity securities purchased, not settled	—			—			31			—

See accompanying notes to consolidated financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

September 30, 2017

1. BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements of Zions Bancorporation (“the Parent”) and its majority-owned subsidiaries (collectively “the Company,” “Zions,” “we,” “our,” “us”) have been prepared in accordance with 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, they 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 have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”), are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force (“EITF”). In certain cases, ASUs are issued jointly with International Financial Reporting Standards (“IFRS”).

Operating results for the nine months endedSeptember 30, 2017 and 2016 are not necessarily indicative of the results that may be expected in future periods. In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated balance sheet at December 31, 2016 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s 2016 Annual Report on Form 10-K. Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income or shareholders’ equity.

Zions Bancorporation (“the Parent”) is a financial holding company headquartered in Salt Lake City, Utah, which owns and operates a commercial bank. The Parent and its subsidiaries (collectively “the Company”) provide a full range of banking and related services in 11 Western and Southwestern states through seven separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Bank (“Amegy”), in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon (“TCBO”) in Oregon. The Parent also owns and operates certain nonbank subsidiaries that engage in financial services.

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2. RECENT ACCOUNTING PRONOUNCEMENTS

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards not yet adopted by the Company
ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and subsequent related ASUs	The core principle of the new guidance is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The banking industry does not expect significant changes because major sources of revenue are from financial instruments that have been excluded from the scope of the new standard, (including loans, derivatives, debt and equity securities, etc.). However, these new standards affect other fees charged by banks, such as asset management fees, credit card interchange fees, deposit account fees, etc. Adoption may be made on a full retrospective basis with practical expedients, or on a modified retrospective basis with a cumulative effect adjustment.	January 1, 2018	Approximately 85% of our revenue, including all of our interest income and a portion of our noninterest income, is out of scope of the guidance. The contracts that are in scope of the guidance are primarily related to service charges and fees on deposit accounts, wealth management income, and other service charges, commissions and fees. We have completed our review of these contracts and have not identified any material changes in the timing of revenue recognition. We plan to adopt this guidance using the modified retrospective transition method, and we expect to expand our qualitative disclosures of revenue recognition upon adoption.
ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	The standard provides revised accounting guidance related to the accounting for and reporting of financial instruments. Some of the main provisions include: – Equity investments that do not result in consolidation and are not accounted for under the equity method would be measured at fair value through net income – Changes in instrument-specific credit risk for financial liabilities that are measured under the fair value option would be recognized in other comprehensive income (“OCI”). – Elimination of the requirement to disclose the methods and significant assumptions used to estimate the fair value of financial instruments carried at amortized cost. However, it will require the use of exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes.	January 1, 2018	We do not have a significant amount of equity securities classified as available-for-sale (“AFS”). Additionally, we do not have any financial liabilities accounted for under the fair value option. Therefore, the transition adjustment upon adoption of this guidance is not expected to be material. We are refining our valuation models to better account for an exit price, but do not expect a significant change in our disclosure.
ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	The purpose of this standard is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The standard is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. The standard requires a modified retrospective transition method that requires recognition of the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption.	January 1, 2018	While we continue to assess all potential impacts of the standard, we currently do not expect adoption of this guidance to have a material impact on our consolidated financial statements. We are still evaluating when to adopt this guidance.

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Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards not yet adopted by the Company (continued)
ASU 2016-02, Leases (Topic 842)	The standard requires that a lessee recognize assets and liabilities for leases with lease terms of more than 12 months. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, the standard will require both types of leases to be recognized on the balance sheet. It also requires disclosures to better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements.	January 1, 2019	We are currently evaluating the potential impact of this guidance on the Company’s financial statements. As of December 31, 2016, the Company had minimum noncancelable net operating lease payments of $275 million that are being evaluated. The implementation team is working on gathering all key lease data elements to meet the requirements of the new guidance. Additionally, we are implementing new lease software that will accommodate the new accounting requirements.
ASU 2017-08, Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities	The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. The standard requires the premium to be amortized to the earliest call date. The update does not change the accounting for securities held at a discount.	January 1, 2019	Our initial analysis suggests this guidance will not have a material impact on the Company’s financial statements, but we will continue to monitor its impact as we move closer to implementation.
ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	The standard significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The standard replaces today’s “incurred loss” approach with an “expected loss” model for instruments such as loans and held-to-maturity (“HTM”) securities that are measured at amortized cost. The standard requires credit losses relating to AFS debt securities to be recorded through an allowance for credit losses (“ACL”) rather than a reduction of the carrying amount. It also changes the accounting for purchased credit-impaired debt securities and loans. The standard retains many of the current disclosure requirements in current GAAP and expands certain disclosure requirements. Early adoption of the guidance is permitted as of January 1, 2019.	January 1, 2020	We have formed an implementation team led jointly by Credit and the Corporate Controller’s group, that also includes other lines of business and functions within the Company. The implementation team is working on developing models that can meet the requirements of the new guidance. While this standard may potentially have a material impact on the Company’s financial statements, we are still in process of conducting our evaluation.
ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	The standard eliminates the requirement to calculate the implied fair value of goodwill (i.e. Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, entities would record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current guidance). The standard does not change the guidance on completing Step 1 of the goodwill impairment test. The standard also continues to allow entities to perform the optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The standard is effective for the Company as of January 1, 2020. Early adoption is allowed for any goodwill impairment test performed after January 1, 2017.	January 1, 2020	We do not currently expect this guidance will have a material impact on the Company’s financial statements since the fair values of our reporting units were not lower than their respective carrying amounts at the time of our goodwill impairment analysis for 2016.

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Standards adopted by the Company
ASU 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting	The standard requires entities to recognize the income tax effects of share-based awards in the income statement when the awards vest or are settled (i.e. the additional paid-in capital pools will be eliminated). The standard provides an entity the option to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. The standard also requires that excess tax benefits be reflected in the operating section of the statement of cash flows rather than the investing section and to make an election to adopt this requirement either on a retrospective or prospective basis.	January 1, 2017	Upon adoption of this ASU, there was no material impact from the cumulative effect adjustment to retained earnings. We elected to account for forfeitures when they occur and to reflect excess tax benefits in the operating section of the statement of cash flows on a prospective basis.

3. FAIR VALUE

Fair Value Measurement

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. For a discussion of the Company’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 20 of our 2016 Annual Report on Form 10-K.

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Quantitative Disclosure by Fair Value Hierarchy

Assets and liabilities measured at fair value by class on a recurring basis are summarized as follows:

(In millions)	September 30, 2017
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,814	$	—	$	13,839
Municipal securities			1,291				1,291
Other debt securities			25				25
Money market mutual funds and other	86		1				87
	111		15,131		—		15,242
Trading account			56				56
Other noninterest-bearing investments:
Bank-owned life insurance			504				504
Private equity investments					93		93
Other assets:
Agriculture loan servicing and interest-only strips					19		19
Deferred compensation plan assets	97						97
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			36				36
Foreign currency exchange contracts	6						6
	6		37		—		43
	$	214	$	15,728	$	112	$	16,054
LIABILITIES
Securities sold, not yet purchased	$	48	$	—	$	—	$	48
Other liabilities:
Deferred compensation plan obligations	97						97
Derivatives:
Interest rate swaps for customers			30				30
Foreign currency exchange contracts	5						5
	5		30		—		35
	$	150	$	30	$	—	$	180

¹We used a third-party pricing service to measure fair value for approximately 92% of our AFS Level 2 securities.

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(In millions)	December 31, 2016
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	—	$	12,009	$	—	$	12,009
Municipal securities			1,154				1,154
Other debt securities			24				24
Money market mutual funds and other	184		1				185
	184		13,188		—		13,372
Trading account			115				115
Other noninterest-bearing investments:
Bank-owned life insurance			497				497
Private equity investments 2	18				73		91
Other assets:
Agriculture loan servicing and interest-only strips					20		20
Deferred compensation plan assets	91						91
Derivatives:
Interest rate swaps and forwards			4				4
Interest rate swaps for customers			49				49
Foreign currency exchange contracts	11						11
	11		53		—		64
	$	304	$	13,853	$	93	$	14,250
LIABILITIES
Securities sold, not yet purchased	$	25	$	—	$	—	$	25
Other liabilities:
Deferred compensation plan obligations	91						91
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			49				49
Foreign currency exchange contracts	9						9
	9		50		—		59
	$	125	$	50	$	—	$	175

¹We used a third-party pricing service to measure fair value for approximately 91% of our AFS Level 2 securities.

² The Level 1 private equity investments amount relates to the portion of our SBIC investments that are now publicly traded.

Level 3 Valuations

Private Equity Investments

Private equity investments are generally measured under Level 3. Certain investments that have converted to being publicly traded are measured under Level 1. The majority of these private equity investments (“PEIs”) are held in Zions’ Small Business Investment Company (“SBIC”) and are early stage venture investments. The fair value measurements of these investments are updated at least on a quarterly basis, including whenever a new round of financing occurs. Certain of these investments are measured using multiples of operating performance. The fair value measurements of PEIs are reviewed on a quarterly basis by the Securities Valuation Committee. The Equity Investments Committee, consisting of executives familiar with the investments, reviews periodic financial information, including audited financial statements when available.

Certain valuation analytics may be employed that include current and projected financial performance, recent financing activities, economic and market conditions, market comparables, market liquidity, sales restrictions, and other factors. A significant change in the expected performance of the individual investment would result in a change in the fair value measurement of the investment. The amount of unfunded commitments to invest is

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disclosed in Note 5. Certain restrictions apply for the redemption of these investments and certain investments are prohibited by the Volcker Rule. See discussions in Note 5.

Agriculture Loan Servicing

This asset results from our servicing of agriculture loans approved and funded by Federal Agricultural Mortgage Corporation (“FAMC”). We provide this servicing under an agreement with FAMC for loans they own. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.

Interest-Only Strips

Interest-only strips are created as a by-product of the securitization process. When the guaranteed portions of Small Business Administration (“SBA”) 7(a) loans are pooled, interest-only strips may be created in the pooling process. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.

Reconciliation of Level 3 Fair Value Measurements

The following reconciles the beginning and ending balances of assets and liabilities that are measured at fair value by class on a recurring basis using Level 3 inputs:

	Level 3 Instruments
	Three Months Ended								Nine Months Ended
	September 30, 2017				September 30, 2016				September 30, 2017						September 30, 2016
(In millions)	Private equity investments		Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments			Ag loan svcg and int-only strips			Private equity investments		Ag loan svcg and int-only strips
Balance at beginning of period	$	82	$	19	$	64	$	18	$	73		$	20		$	58	$	14
Securities gains, net	5		—		1		—		7			—			3		—
Other noninterest income	—		—		—		2		—			(1		)	—		6
Purchases	6		—		2		—		18			—			6		—
Redemptions and paydowns	—		—		—		—		(5		)	—			—		—
Balance at end of period	$	93	$	19	$	67	$	20	$	93		$	19		$	67	$	20

No transfers of assets or liabilities occurred among Levels 1, 2 or 3 for the three and nine months ended September 30, 2017 and 2016.

The reconciliation of Level 3 instruments includes the following realized gains in the statement of income:

(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Securities gains, net	$	—	$	4	$	3	$	4

Nonrecurring Fair Value Measurements

Included in the balance sheet amounts are the following amounts of assets that had fair value changes measured on a nonrecurring basis.

(In millions)	Fair value at September 30, 2017								Fair value at December 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS
Private equity investments	$	—	$	—	$	1	$	1	$	—	$	—	$	1	$	1
Impaired loans	—		17		—		17		—		52		—		52
Other real estate owned	—		—		—		—		—		1		—		1
	$	—	$	17	$	1	$	18	$	—	$	53	$	1	$	54

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The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value.

	Gains (losses) from fair value changes
(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
ASSETS
Private equity investments	$	—		$	—		$	(1	)	$	—
Impaired loans	(1		)	(5		)	(8		)	(34		)
Other real estate owned	—			(1		)	—			(1		)
	$	(1	)	$	(6	)	$	(9	)	$	(35	)

During the three and nine months endedSeptember 30, we recognized $1 million and $2 million of net gains in 2017 and an insignificant amount and $3 million in 2016 from the sale of other real estate owned (“OREO”) properties that had a carrying value at the time of sale of approximately $5 million and $8 million during the nine months endedSeptember 30, 2017 and 2016, respectively. Previous to their sale in these periods, we recognized impairment on these properties of an insignificant amount in 2017 and 2016.

Private equity investments carried at cost were measured at fair value for impairment purposes according to the methodology previously discussed for these investments. Amounts of PEIs carried at cost were $10 million at September 30, 2017 and $13 million at December 31, 2016. Amounts of other noninterest-bearing investments carried at cost were $324 million at September 30, 2017 and $211 million at December 31, 2016, which were comprised of Federal Reserve and Federal Home Loan Bank (“FHLB”) stock. Private equity investments accounted for using the equity method were $35 million at September 30, 2017 and $38 million at December 31, 2016.

Impaired (or nonperforming) loans that are collateral dependent were measured at fair value based on the fair value of the collateral. OREO was measured initially at fair value based on collateral appraisals at the time of transfer and subsequently at the lower of cost or fair value. For additional information regarding the measurement of fair value for impaired loans, collateral-dependent loans, and OREO, see Note 20 of our 2016 Annual Report on Form 10-K.

Fair Value of Certain Financial Instruments

Following is a summary of the carrying values and estimated fair values of certain financial instruments:

	September 30, 2017					December 31, 2016
(In millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
HTM investment securities	$	746	$	743	2	$	868	$	850	2
Loans and leases (including loans held for sale), net of allowance	43,686		43,196		3	42,254		42,111		3
Financial liabilities:
Time deposits	2,909		2,890		2	2,757		2,744		2
Other short-term borrowings	3,250		3,250		2	500		500		2
Long-term debt	383		406		2	535		552		2

This summary excludes financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis. For additional information regarding the financial instruments within the scope of this disclosure, and the methods and significant assumptions used to estimate their fair value, see Note 20 of our 2016 Annual Report on Form 10-K.

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4. OFFSETTING ASSETS AND LIABILITIES

Gross and net information for selected financial instruments in the balance sheet is as follows:

	September 30, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	779	$	(312	)	$	467	$	—		$	—		$	467
Derivatives (included in other assets)	43		—			43		(15		)	—			28
Total assets	$	822	$	(312	)	$	510	$	(15	)	$	—		$	495
Liabilities:
Federal funds and other short-term borrowings	$	4,936	$	(312	)	$	4,624	$	—		$	—		$	4,624
Derivatives (included in other liabilities)	35		—			35		(15		)	(11		)	9
Total Liabilities	$	4,971	$	(312	)	$	4,659	$	(15	)	$	(11	)	$	4,633

	December 31, 2016
(In millions)							Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	568	$	—	$	568	$	—		$	—		$	568
Derivatives (included in other assets)	64		—		64		(17		)	—			47
Total assets	$	632	$	—	$	632	$	(17	)	$	—		$	615
Liabilities:
Federal funds and other short-term borrowings	$	827	$	—	$	827	$	—		$	—		$	827
Derivatives (included in other liabilities)	59		—		59		(17		)	(17		)	25
Total Liabilities	$	886	$	—	$	886	$	(17	)	$	(17	)	$	852

Security repurchase and reverse repurchase (“resell”) agreements are offset, when applicable, in the balance sheet according to master netting agreements. Security repurchase agreements are included with “Federal funds and other short-term borrowings.” Derivative instruments may be offset under their master netting agreements; however, for accounting purposes, we present these items on a gross basis in the Company’s balance sheet. See Note 7 for further information regarding derivative instruments.

5. INVESTMENTS

Investment Securities

Securities are classified as HTM, AFS or trading. HTM securities, which management has the intent and ability to hold until maturity, are carried at amortized cost. AFS securities are carried at fair value and unrealized gains and losses are reported as net increases or decreases to accumulated other comprehensive income (“AOCI”). Realized gains and losses on AFS securities are determined by using the cost basis of each individual security. Trading securities are carried at fair value with gains and losses recognized in current period earnings. The purchase premiums and discounts for both HTM and AFS securities are amortized and accreted at a constant effective yield to the contractual maturity date and no assumption is made concerning prepayments. As principal prepayments occur, the portion of the unamortized premium or discount associated with the principal reduction is recognized as interest

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income in the period the principal is reduced. Note 20 of our 2016 Annual Report on Form 10-K discusses the process to estimate fair value for investment securities.

	September 30, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	746	$	7	$	10	$	743
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,839		5		4		1,840
Agency guaranteed mortgage-backed securities	9,748		21		86		9,683
Small Business Administration loan-backed securities	2,281		19		9		2,291
Municipal securities	1,281		15		5		1,291
Other debt securities	25		—		—		25
	15,199		60		104		15,155
Money market mutual funds and other	87		—		—		87
	15,286		60		104		15,242
Total	$	16,032	$	67	$	114	$	15,985

	December 31, 2016
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	868	$	5	$	23	$	850
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	1,846		2		9		1,839
Agency guaranteed mortgage-backed securities	7,986		7		110		7,883
Small Business Administration loan-backed securities	2,298		8		18		2,288
Municipal securities	1,182		1		29		1,154
Other debt securities	25		—		1		24
	13,337		18		167		13,188
Money market mutual funds and other	184		—		—		184
	13,521		18		167		13,372
Total	$	14,389	$	23	$	190	$	14,222

Maturities

The amortized cost and estimated fair value of investment debt securities are shown subsequently as of September 30, 2017, by expected timing of principal payments. Actual principal payments may differ from contractual or expected principal payments because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	September 30, 2017
	Held-to-maturity				Available-for-sale
(In millions)	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value
Principal return in one year or less	$	99	$	100	$	2,296	$	2,285
Principal return after one year through five years	282		284		5,406		5,384
Principal return after five years through ten years	186		188		4,784		4,779
Principal return after ten years	179		171		2,713		2,707
Total	$	746	$	743	$	15,199	$	15,155

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The following is a summary of the amount of gross unrealized losses for investment securities and the estimated fair value by length of time the securities have been in an unrealized loss position:

	September 30, 2017
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	1	$	175	$	9	$	132	$	10	$	307
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	3		576		1		331		4		907
Agency guaranteed mortgage-backed securities	74		6,266		12		677		86		6,943
Small Business Administration loan-backed securities	1		149		8		749		9		898
Municipal securities	3		321		2		122		5		443
Other	—		—		—		—		—		—
Available-for-sale total	81		7,312		23		1,879		104		9,191
Total	$	82	$	7,487	$	32	$	2,011	$	114	$	9,498

	December 31, 2016
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value
Held-to-maturity
Municipal securities	$	15	$	467	$	8	$	61	$	23	$	528
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	9		950		—		127		9		1,077
Agency guaranteed mortgage-backed securities	102		6,649		7		326		109		6,975
Small Business Administration loan-backed securities	3		527		16		841		19		1,368
Municipal securities	28		992		—		9		28		1,001
Other	—		—		2		14		2		14
Available-for-sale total	142		9,118		25		1,317		167		10,435
Total	$	157	$	9,585	$	33	$	1,378	$	190	$	10,963

At September 30, 2017 and December 31, 2016, respectively, 360 and 642 HTM and 1,446 and 2,398 AFS investment securities were in an unrealized loss position.

Other-Than-Temporary Impairment

Ongoing Policy

We review investment securities on a quarterly basis for the presence of other-than-temporary impairment (“OTTI”). Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At September 30, 2017, we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is not more likely than not we would be required to sell such securities before recovery of their amortized cost basis. Therefore, these securities did not have any OTTI recognized during the third quarter of 2017. For additional information on our policy and evaluation process relating to OTTI, see Note 5 of our 2016 Annual Report on Form 10-K.

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The following summarizes gains and losses, including OTTI, of which there was none, that were recognized in the statement of income:

	Three Months Ended								Nine Months Ended
	September 30, 2017				September 30, 2016				September 30, 2017				September 30, 2016
(In millions)	Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross  losses
Investment securities:
Other noninterest-bearing investments	$	5	$	—	$	8	$	—	$	20	$	7	$	15	$	4
Net gains 1			$	5			$	8			$	13			$	11

¹ Net gains were recognized in securities gains, net in the statement of income.

Interest income by security type is as follows:

(In millions)	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	7	$	10	$	17
Available-for-sale	72		6		78		209		18		227
Trading	1		—		1		2		—		2
Total	$	75	$	9	$	84	$	218	$	28	$	246

(In millions)	Three Months Ended September 30, 2016						Nine Months Ended September 30, 2016
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	7	$	9	$	16
Available-for-sale	40		3		43		118		8		126
Trading	1		—		1		1		—		1
Total	$	43	$	6	$	49	$	126	$	17	$	143

Investment securities with a carrying value of $2.3 billion at September 30, 2017 and $1.4 billion at December 31, 2016 were pledged to secure public and trust deposits, advances, and for other purposes as required by law. Securities are also pledged as collateral for security repurchase agreements.

Private Equity Investments

Effect of Volcker Rule

The Company’s PEIs are subject to the provisions of the Dodd-Frank Act. The Volcker Rule of the Dodd-Frank Act prohibits banks and bank holding companies from holding PEIs, except for SBIC funds and certain other permitted exclusions, beyond a required deadline. The Federal Reserve Board announced in December 2016 that it would allow banks to apply for an additional five-year extension beyond the July 21, 2017 deadline to comply with the Dodd-Frank Act requirement for these investments. The Company applied for and was granted an extension for its eligible PEIs. All positions in the remaining portfolio of PEIs are subject to the extended deadline or other applicable exclusions.

Of the recorded PEIs of $138 million at September 30, 2017, approximately $4 million remain prohibited by the Volcker Rule. At September 30, 2017, we have $27 million of unfunded commitments for PEIs, of which approximately $4 million relate to prohibited PEIs. We currently do not believe that this divestiture requirement will ultimately have a material impact on our financial statements. See other discussions related to private equity investments in Note 3.

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6. LOANS AND ALLOWANCE FOR CREDIT LOSSES

Loans and Loans Held for Sale

Loans are summarized as follows according to major portfolio segment and specific loan class:

(In millions)	September 30, 2017		December 31, 2016
Loans held for sale	$	71	$	172
Commercial:
Commercial and industrial	$	14,041	$	13,452
Leasing	343		423
Owner-occupied	7,082		6,962
Municipal	1,073		778
Total commercial	22,539		21,615
Commercial real estate:
Construction and land development	2,170		2,019
Term	8,944		9,322
Total commercial real estate	11,114		11,341
Consumer:
Home equity credit line	2,745		2,645
1-4 family residential	6,522		5,891
Construction and other consumer real estate	558		486
Bankcard and other revolving plans	490		481
Other	188		190
Total consumer	10,503		9,693
Total loans	$	44,156	$	42,649

Loan balances are presented net of unearned income and fees, which amounted to $63 million at September 30, 2017 and $77 million at December 31, 2016.

Owner-occupied and commercial real estate loans include unamortized premiums of approximately $17 million at September 30, 2017 and $20 million at December 31, 2016.

Municipal loans generally include loans to municipalities with the debt service being repaid from general funds or pledged revenues of the municipal entity, or to private commercial entities or 501(c)(3) not-for-profit entities utilizing a pass-through municipal entity to achieve favorable tax treatment.

Land development loans included in the construction and land development loan class were $238 million at September 30, 2017 and $290 million at December 31, 2016.

Loans with a carrying value of approximately $25.4 billion at September 30, 2017 and $24.0 billion at December 31, 2016 have been pledged at the Federal Reserve and the FHLB of Des Moines as collateral for current and potential borrowings.

We sold loans totaling $146 million and $696 million for the three and nine months endedSeptember 30, 2017, and $413 million and $1.0 billion for the three and nine months endedSeptember 30, 2016, respectively, that were classified as loans held for sale. The sold loans were derecognized from the balance sheet. Loans classified as loans held for sale primarily consist of conforming residential mortgages and the guaranteed portion of SBA loans. The loans are mainly sold to U.S. government agencies or participated to third parties. At times, we have continuing involvement in the transferred loans in the form of servicing rights or a guarantee from the respective issuer. Amounts added to loans held for sale during these same periods were $176 million and $640 million for the three and nine months endedSeptember 30, 2017, and $387 million and $979 million for the three and nine months endedSeptember 30, 2016, respectively.

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The principal balance of sold loans for which we retain servicing was approximately $2.1 billion at September 30, 2017, and $2.0 billion at December 31, 2016. Income from loans sold, excluding servicing, was $1 million and $9 million for the three and nine months endedSeptember 30, 2017, and $6 million and $15 million for the three and nine months endedSeptember 30, 2016, respectively.

Allowance for Credit Losses

The ACL consists of the allowance for loan and lease losses (“ALLL”) and the reserve for unfunded lending commitments (“RULC”). The ALLL represents our estimate of probable and estimable losses inherent in the loan and lease portfolio as of the balance sheet date. We also estimate a reserve for potential losses associated with off-balance sheet commitments, including standby letters of credit. We determine the RULC using the same procedures and methodologies that we use for the ALLL.

For additional information regarding our policies and methodologies used to estimate the ACL, see Note 6 of our 2016 Annual Report on Form 10-K.

Changes in the allowance for credit losses are summarized as follows:
	Three Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	393		$	116		$	35		$	544
Additions:
Provision for loan losses	(4		)	(7		)	16			5
Deductions:
Gross loan and lease charge-offs	(16		)	(4		)	(5		)	(25		)
Recoveries	12			2			3			17
Net loan and lease charge-offs	(4		)	(2		)	(2		)	(8		)
Balance at end of period	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	53		$	10		$	—		$	63
Provision charged to earnings	(4		)	—			—			(4		)
Balance at end of period	$	49		$	10		$	—		$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments	49			10			—			59
Total allowance for credit losses	$	434		$	117		$	49		$	600

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ZIONS BANCORPORATION AND SUBSIDIARIES

	Nine Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	420		$	116		$	31		$	567
Additions:
Provision for loan losses	27			(15		)	23			35
Deductions:
Gross loan and lease charge-offs	(98		)	(6		)	(13		)	(117		)
Recoveries	36			12			8			56
Net loan and lease (charge-offs) recoveries	(62		)	6			(5		)	(61		)
Balance at end of period	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—		$	65
Provision credited to earnings	(5		)	(1		)	—			(6		)
Balance at end of period	$	49		$	10		$	—		$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments	49			10			—			59
Total allowance for credit losses	$	434		$	117		$	49		$	600

	Three Months Ended September 30, 2016
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	457		$	121		$	30		$	608
Additions:
Provision for loan losses	22			(6		)	3			19
Deductions:
Gross loan and lease charge-offs	(48		)	(1		)	(5		)	(54		)
Recoveries	15			7			2			24
Net loan and lease (charge-offs) recoveries	(33		)	6			(3		)	(30		)
Balance at end of period	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—		$	65
Provision credited to earnings	(2		)	(1		)	—			(3		)
Balance at end of period	$	52		$	10		$	—		$	62
Total allowance for credit losses at end of period
Allowance for loan losses	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments	52			10			—			62
Total allowance for credit losses	$	498		$	131		$	30		$	659

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	Nine Months Ended September 30, 2016
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	454		$	114		$	38		$	606
Additions:
Provision for loan losses	93			5			(3		)	95
Deductions:
Gross loan and lease charge-offs	(137		)	(10		)	(12		)	(159		)
Recoveries	36			12			7			55
Net loan and lease (charge-offs) recoveries	(101		)	2			(5		)	(104		)
Balance at end of period	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments
Balance at beginning of period	$	58		$	16		$	1		$	75
Provision credited to earnings	(6		)	(6		)	(1		)	(13		)
Balance at end of period	$	52		$	10		$	—		$	62
Total allowance for credit losses at end of period
Allowance for loan losses	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments	52			10			—			62
Total allowance for credit losses	$	498		$	131		$	30		$	659

The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows:
	September 30, 2017
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	28	$	1	$	4	$	33
Collectively evaluated for impairment	357		106		45		508
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	385	$	107	$	49	$	541
Outstanding loan balances:
Individually evaluated for impairment	$	352	$	78	$	70	$	500
Collectively evaluated for impairment	22,163		11,026		10,427		43,616
Purchased loans with evidence of credit deterioration	24		10		6		40
Total	$	22,539	$	11,114	$	10,503	$	44,156

	December 31, 2016
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	56	$	3	$	6	$	65
Collectively evaluated for impairment	364		113		25		502
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	420	$	116	$	31	$	567
Outstanding loan balances:
Individually evaluated for impairment	$	466	$	78	$	75	$	619
Collectively evaluated for impairment	21,111		11,231		9,611		41,953
Purchased loans with evidence of credit deterioration	38		32		7		77
Total	$	21,615	$	11,341	$	9,693	$	42,649

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Nonaccrual and Past Due Loans

Loans are generally placed on nonaccrual status when payment in full of principal and interest is not expected, or the loan is 90 days or more past due as to principal or interest, unless the loan is both well secured and in the process of collection. For further discussion of our policies and processes regarding nonaccrual and past due loans, see Note 6 of our 2016 Annual Report on Form 10-K.

Nonaccrual loans are summarized as follows:
(In millions)	September 30, 2017		December 31, 2016
Loans held for sale	$	13	$	40
Commercial:
Commercial and industrial	$	257	$	354
Leasing	8		14
Owner-occupied	85		74
Municipal	1		1
Total commercial	351		443
Commercial real estate:
Construction and land development	6		7
Term	41		29
Total commercial real estate	47		36
Consumer:
Home equity credit line	11		11
1-4 family residential	40		36
Construction and other consumer real estate	1		2
Bankcard and other revolving plans	1		1
Other	1		—
Total consumer loans	54		50
Total	$	452	$	529

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ZIONS BANCORPORATION AND SUBSIDIARIES

Past due loans (accruing and nonaccruing) are summarized as follows:
	September 30, 2017
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	58	$	—	$	13	$	13	$	71	$	—	$	—
Commercial:
Commercial and industrial	$	13,870	$	53	$	118	$	171	$	14,041	$	17	$	150
Leasing	343		—		—		—		343		—		8
Owner-occupied	7,021		27		34		61		7,082		5		49
Municipal	1,073		—		—		—		1,073		—		1
Total commercial	22,307		80		152		232		22,539		22		208
Commercial real estate:
Construction and land development	2,158		6		6		12		2,170		1		1
Term	8,925		8		11		19		8,944		2		30
Total commercial real estate	11,083		14		17		31		11,114		3		31
Consumer:
Home equity credit line	2,735		6		4		10		2,745		—		4
1-4 family residential	6,497		10		15		25		6,522		—		20
Construction and other consumer real estate	547		6		5		11		558		4		—
Bankcard and other revolving plans	486		3		1		4		490		1		1
Other	185		3		—		3		188		—		1
Total consumer loans	10,450		28		25		53		10,503		5		26
Total	$	43,840	$	122	$	194	$	316	$	44,156	$	30	$	265

	December 31, 2016
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	172	$	—	$	—	$	—	$	172	$	—	$	40
Commercial:
Commercial and industrial	$	13,306	$	72	$	74	$	146	$	13,452	$	10	$	287
Leasing	423		—		—		—		423		—		14
Owner-occupied	6,894		40		28		68		6,962		8		43
Municipal	778		—		—		—		778		—		1
Total commercial	21,401		112		102		214		21,615		18		345
Commercial real estate:
Construction and land development	2,010		7		2		9		2,019		1		1
Term	9,291		9		22		31		9,322		12		18
Total commercial real estate	11,301		16		24		40		11,341		13		19
Consumer:
Home equity credit line	2,635		4		6		10		2,645		1		5
1-4 family residential	5,857		12		22		34		5,891		—		11
Construction and other consumer real estate	479		3		4		7		486		3		—
Bankcard and other revolving plans	478		2		1		3		481		1		1
Other	189		1		—		1		190		—		—
Total consumer loans	9,638		22		33		55		9,693		5		17
Total	$	42,340	$	150	$	159	$	309	$	42,649	$	36	$	381

¹  Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

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Credit Quality Indicators

In addition to the past due and nonaccrual criteria, we also analyze loans using loan risk-grading systems, which vary based on the size and type of credit risk exposure. The internal risk grades assigned to loans follow our definitions of Pass, Special Mention, Substandard, and Doubtful, which are consistent with published definitions of regulatory risk classifications. For further discussion of our policies and processes regarding credit quality indicators and internal loan risk grading, see Note 6 of our 2016 Annual Report on Form 10-K.

Outstanding loan balances (accruing and nonaccruing) categorized by these credit quality classifications are summarized as follows:

	September 30, 2017
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	12,987	$	357	$	695	$	2	$	14,041
Leasing	325		1		17		—		343
Owner-occupied	6,697		93		292		—		7,082
Municipal	1,072		—		1		—		1,073
Total commercial	21,081		451		1,005		2		22,539		$	385
Commercial real estate:
Construction and land development	2,140		24		6		—		2,170
Term	8,697		84		163		—		8,944
Total commercial real estate	10,837		108		169		—		11,114		107
Consumer:
Home equity credit line	2,728		—		17		—		2,745
1-4 family residential	6,475		—		47		—		6,522
Construction and other consumer real estate	554		—		4		—		558
Bankcard and other revolving plans	487		—		3		—		490
Other	187		—		1		—		188
Total consumer loans	10,431		—		72		—		10,503		49
Total	$	42,349	$	559	$	1,246	$	2	$	44,156	$	541

	December 31, 2016
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	12,185	$	266	$	998	$	3	$	13,452
Leasing	387		5		30		1		423
Owner-occupied	6,560		96		306		—		6,962
Municipal	765		7		6		—		778
Total commercial	19,897		374		1,340		4		21,615		$	420
Commercial real estate:
Construction and land development	1,942		52		25		—		2,019
Term	9,096		82		144		—		9,322
Total commercial real estate	11,038		134		169		—		11,341		116
Consumer:
Home equity credit line	2,629		—		16		—		2,645
1-4 family residential	5,851		—		40		—		5,891
Construction and other consumer real estate	482		—		4		—		486
Bankcard and other revolving plans	478		—		3		—		481
Other	189		—		1		—		190
Total consumer loans	9,629		—		64		—		9,693		31
Total	$	40,564	$	508	$	1,573	$	4	$	42,649	$	567

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Impaired Loans

Loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due in accordance with the contractual terms of the loan agreement, including scheduled interest payments. Payments received on impaired loans that are accruing are recognized in interest income, according to the contractual loan agreement. Payments received on impaired loans that are on nonaccrual are not recognized in interest income, but are applied as a reduction to the principal outstanding. The amount of interest income recognized on a cash basis during the time the loans were impaired within the three and six months ended September 30, 2017 and 2016 was not significant. For additional information regarding our policies and methodologies used to evaluate impaired loans, see Note 6 of our 2016 Annual Report on Form 10-K.

Information on impaired loans individually evaluated is summarized as follows, including the average recorded investment and interest income recognized for the three months endedSeptember 30, 2017 and 2016:

	September 30, 2017
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	313	$	109	$	160	$	269	$	25
Owner-occupied	117		64		39		103		3
Municipal	1		1		—		1		—
Total commercial	431		174		199		373		28
Commercial real estate:
Construction and land development	10		5		4		9		—
Term	67		45		12		57		—
Total commercial real estate	77		50		16		66		—
Consumer:
Home equity credit line	24		13		8		21		—
1-4 family residential	61		26		25		51		4
Construction and other consumer real estate	3		2		1		3		—
Other	1		1		—		1		—
Total consumer loans	89		42		34		76		4
Total	$	597	$	266	$	249	$	515	$	32

	December 31, 2016
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	470	$	82	$	311	$	393	$	52
Owner-occupied	115		71		30		101		3
Municipal	1		1		—		1		—
Total commercial	586		154		341		495		55
Commercial real estate:
Construction and land development	22		7		6		13		—
Term	92		53		17		70		2
Total commercial real estate	114		60		23		83		2
Consumer:
Home equity credit line	24		16		7		23		—
1-4 family residential	59		27		28		55		6
Construction and other consumer real estate	3		1		2		3		—
Other	2		1		—		1		—
Total consumer loans	88		45		37		82		6
Total	$	788	$	259	$	401	$	660	$	63

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	Three Months Ended September 30, 2017				Nine Months Ended September 30, 2017
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	356	$	1	$	311	$	5
Owner-occupied	104		2		101		5
Municipal	1		—		1		—
Total commercial	461		3		413		10
Commercial real estate:
Construction and land development	10		—		11		—
Term	53		1		58		11
Total commercial real estate	63		1		69		11
Consumer:
Home equity credit line	21		—		21		1
1-4 family residential	53		1		53		1
Construction and other consumer real estate	2		—		2		—
Other	1		—		1		—
Total consumer loans	77		1		77		2
Total	$	601	$	5	$	559	$	23

	Three Months Ended September 30, 2016				Nine Months Ended September 30, 2016
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	449	$	1	$	319	$	4
Owner-occupied	100		2		103		8
Municipal	1		—		1		—
Total commercial	550		3		423		12
Commercial real estate:
Construction and land development	11		1		12		2
Term	74		3		79		9
Total commercial real estate	85		4		91		11
Consumer:
Home equity credit line	23		—		22		1
1-4 family residential	61		1		58		2
Construction and other consumer real estate	3		—		3		—
Other	2		—		2		—
Total consumer loans	89		1		85		3
Total	$	724	$	8	$	599	$	26

Modified and Restructured Loans

Loans may be modified in the normal course of business for competitive reasons or to strengthen the Company’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Company has granted a concession that it would not otherwise consider, are considered troubled debt restructurings (“TDRs”). For further discussion of our policies and processes regarding TDRs, see Note 6 of our 2016 Annual Report on Form 10-K.

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Selected information on TDRs that includes the recorded investment on an accruing and nonaccruing basis by loan class and modification type is summarized in the following schedules:

	September 30, 2017
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	4	$	—	$	—	$	11	$	23	$	38
Owner-occupied	2		—		1		—		7		13		23
Total commercial	2		4		1		—		18		36		61
Commercial real estate:
Construction and land development	—		2		—		—		—		2		4
Term	4		—		—		1		2		7		14
Total commercial real estate	4		2		—		1		2		9		18
Consumer:
Home equity credit line	—		2		10		—		—		3		15
1-4 family residential	1		—		7		1		2		26		37
Construction and other consumer real estate	—		1		—		—		—		1		2
Total consumer loans	1		3		17		1		2		30		54
Total accruing	7		9		18		2		22		75		133
Nonaccruing
Commercial:
Commercial and industrial	—		1		4		4		46		27		82
Owner-occupied	1		2		—		1		1		9		14
Municipal	—		1		—		—		—		—		1
Total commercial	1		4		4		5		47		36		97
Commercial real estate:
Construction and land development	—		—		—		—		—		—		—
Term	2		1		—		—		1		4		8
Total commercial real estate	2		1		—		—		1		4		8
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		2		—		1		5		8
Construction and other consumer real estate	—		—		—		1		—		—		1
Total consumer loans	—		—		3		1		1		5		10
Total nonaccruing	3		5		7		6		49		45		115
Total	$	10	$	14	$	25	$	8	$	71	$	120	$	248

¹ Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

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	December 31, 2016
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	19	$	—	$	—	$	—	$	28	$	47
Owner-occupied	3		—		1		—		8		10		22
Total commercial	3		19		1		—		8		38		69
Commercial real estate:
Construction and land development	—		4		—		—		—		4		8
Term	4		—		—		1		2		10		17
Total commercial real estate	4		4		—		1		2		14		25
Consumer:
Home equity credit line	—		1		10		—		—		3		14
1-4 family residential	3		1		6		—		2		30		42
Construction and other consumer real estate	—		—		—		—		—		1		1
Total consumer loans	3		2		16		—		2		34		57
Total accruing	10		25		17		1		12		86		151
Nonaccruing
Commercial:
Commercial and industrial	1		—		—		1		33		25		60
Owner-occupied	—		1		—		3		1		12		17
Municipal	—		1		—		—		—		—		1
Total commercial	1		2		—		4		34		37		78
Commercial real estate:
Construction and land development	—		—		—		—		2		—		2
Term	2		1		—		—		2		3		8
Total commercial real estate	2		1		—		—		4		3		10
Consumer:
Home equity credit line	—		—		1		—		—		1		2
1-4 family residential	—		—		2		—		1		5		8
Construction and other consumer real estate	—		—		—		2		—		—		2
Total consumer loans	—		—		3		2		1		6		12
Total nonaccruing	3		3		3		6		39		46		100
Total	$	13	$	28	$	20	$	7	$	51	$	132	$	251

¹  Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

Unfunded lending commitments on TDRs amounted to approximately $18 million at September 30, 2017 and $14 million at December 31, 2016.

The total recorded investment of all TDRs in which interest rates were modified below market was $116 million at September 30, 2017 and $128 million at December 31, 2016. These loans are included in the previous schedule in the columns for interest rate below market and multiple modification types.

The net financial impact on interest income due to interest rate modifications below market for accruing TDRs for the three and nine months endedSeptember 30, 2017 and 2016 was not significant.

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On an ongoing basis, we monitor the performance of all TDRs according to their restructured terms. Subsequent payment default is defined in terms of delinquency, when principal or interest payments are past due 90 days or more for commercial loans, or 60 days or more for consumer loans.

The recorded investment of accruing and nonaccruing TDRs that had a payment default during the period listed below (and are still in default at period end) and are within 12 months or less of being modified as TDRs is as follows:

	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing			Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	1	1,291	$	1
Owner-occupied	—		—		—		—		1		5,405	1
Total commercial	—		1		1		—		2			2
Total	$	—	$	1	$	1	$	—	$	2		$	2

	Three Months Ended September 30, 2016						Nine Months Ended September 30, 2016
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	3	$	3	$	—	$	3	$	3
Owner-occupied	4		—		4		4		—		4
Total commercial	4		3		7		4		3		7
Total	$	4	$	3	$	7	$	4	$	3	$	7

Note: Total loans modified as TDRs during the 12 months previous to September 30, 2017 and 2016 were $84 millionand $139 million, respectively.

At September 30, 2017 and December 31, 2016, the amount of foreclosed residential real estate property held by the Company was approximately $1 million and $2 million, and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure was approximately $7 million and $10 million, respectively.

Concentrations of Credit Risk

Credit risk is the possibility of loss from the failure of a borrower, guarantor, or another obligor to fully perform under the terms of a credit-related contract. We perform an ongoing analysis of our loan portfolio to evaluate whether there is any significant exposure to any concentrations of credit risk. See Note 6 of our 2016 Annual Report on Form 10-K for further discussion of our evaluation of credit risk concentrations. See also Note 7 of our 2016 Annual Report on Form 10-K for a discussion of counterparty risk associated with the Company’s derivative transactions.

Purchased Loans

Background and Accounting

We purchase loans in the ordinary course of business and account for them and the related interest income based on their performing status at the time of acquisition. Purchased credit-impaired (“PCI”) loans have evidence of credit deterioration at the time of acquisition and it is probable that not all contractual payments will be collected. Interest income for PCI loans is accounted for on an expected cash flow basis. Upon acquisition, in accordance with applicable accounting guidance, the acquired loans were recorded at their fair value without a corresponding ALLL. Certain acquired loans with similar characteristics such as risk exposure, type, size, etc., are grouped and accounted for in loan pools.

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Outstanding Balances and Accretable Yield

The outstanding balances of all required payments and the related carrying amounts for PCI loans are as follows:

(In millions)	September 30, 2017		December 31, 2016
Commercial	$	36	$	49
Commercial real estate	15		51
Consumer	7		9
Outstanding balance	$	58	$	109
Carrying amount	$	40	$	77
Less ALLL	—		1
Carrying amount, net	$	40	$	76

At the time of acquisition of PCI loans, we determine the loan’s contractually required payments in excess of all cash flows expected to be collected as an amount that should not be accreted (nonaccretable difference). With respect to the cash flows expected to be collected, the portion representing the excess of the loan’s expected cash flows over our initial investment (accretable yield) is accreted into interest income on a level yield basis over the remaining expected life of the loan or pool of loans. The effects of estimated prepayments are considered in estimating the expected cash flows.

Certain PCI loans are not accounted for as previously described because the estimation of cash flows to be collected involves a high degree of uncertainty. Under these circumstances, the accounting guidance provides that interest income is recognized on a cash basis similar to the cost recovery methodology for nonaccrual loans. The net carrying amounts in the preceding schedule also include the amounts for these loans. There were no loans of this type at September 30, 2017 and December 31, 2016.

Changes in the accretable yield for PCI loans were as follows:

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Balance at beginning of period	$	21		$	38		$	33		$	40
Accretion	(2		)	(6		)	(17		)	(19		)
Reclassification from nonaccretable difference	—			—			(1		)	9
Disposals and other	—			2			4			4
Balance at end of period	$	19		$	34		$	19		$	34

Note: Amounts have been adjusted based on refinements to the original estimates of the accretable yield.

The primary drivers of reclassification to accretable yield from nonaccretable difference and increases in disposals and other resulted primarily from (1) changes in estimated cash flows, (2) unexpected payments on nonaccrual loans, and (3) recoveries on zero balance loans pools. See subsequent discussion under changes in cash flow estimates.

ALLL Determination

For all acquired loans, the ALLL is only established for credit deterioration subsequent to the date of acquisition and represents our estimate of the inherent losses in excess of the book value of acquired loans. The ALLL for acquired loans is included in the overall ALLL in the balance sheet.

During the three and nine months endedSeptember 30, we adjusted the ALLL for acquired loans by recording a provision for loan losses of an insignificant amount for both periods in 2017, and $1 million and $2 million in 2016, respectively. The provision is net of the ALLL reversals resulting from changes in cash flow estimates, which are discussed subsequently.

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Changes in the provision for loan losses and related ALLL are driven in large part by the same factors that affect the changes in reclassification from nonaccretable difference to accretable yield, as discussed under changes in cash flow estimates.

Changes in Cash Flow Estimates

Over the life of the loan or loan pool, we continue to estimate cash flows expected to be collected. We evaluate quarterly at the balance sheet date whether the estimated present values of these loans using the effective interest rates have decreased below their carrying values. If so, we record a provision for loan losses.

For increases in carrying values that resulted from better-than-expected cash flows, we use such increases first to reverse any existing ALLL. During the three and nine months endedSeptember 30, total reversals to the ALLL, including the impact of increases in estimated cash flows, were insignificant during both periods in 2017 and $1 million during both periods in 2016, respectively. When there is no current ALLL, we increase the amount of accretable yield on a prospective basis over the remaining life of the loan and recognize this increase in interest income.

For the three and nine months endedSeptember 30, the impact of increased cash flow estimates recognized in the statement of income for acquired loans with no ALLL was approximately $2 million and $15 million in 2017, and $4 million and $14 million in 2016, respectively, of additional interest income.

7. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Objectives and Accounting

Our objectives in using derivatives are to add stability to interest income or expense, to modify the duration of specific assets or liabilities as we consider advisable, to manage exposure to interest rate movements or other identified risks, and/or to directly offset derivatives sold to our customers. For a detailed discussion of the use of and accounting policies regarding derivative instruments, see Note 7 of our 2016 Annual Report on Form 10-K

Collateral and Credit Risk

Exposure to credit risk arises from the possibility of nonperformance by counterparties. No significant losses on derivative instruments have occurred as a result of counterparty nonperformance. For a more detailed discussion of collateral and credit risk related to our derivative contracts see Note 7 of our 2016 Annual Report on Form 10-K.

Our derivative contracts require us to pledge collateral for derivatives that are in a net liability position at a given balance sheet date. Certain of these derivative contracts contain credit-risk-related contingent features that include the requirement to maintain a minimum debt credit rating. We may be required to pledge additional collateral if a credit-risk-related feature were triggered, such as a downgrade of our credit rating. However, in past situations, not all counterparties have demanded that additional collateral be pledged when provided for under their contracts. At September 30, 2017, the fair value of our derivative liabilities was $35 million, for which we were required to pledge cash collateral of approximately $46 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s or Moody’s at September 30, 2017, the additional amount of collateral we could be required to pledge is approximately $1 million. As a result of the Dodd-Frank Act, all newly eligible derivatives entered into are cleared through a central clearinghouse. Derivatives that are centrally cleared do not have credit-risk-related features that require additional collateral if our credit rating were downgraded.

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Derivative Amounts

Selected information with respect to notional amounts and recorded gross fair values at September 30, 2017 and December 31, 2016, and the related gain (loss) of derivative instruments for the three and nine months endedSeptember 30, 2017 and 2016 is summarized as follows:

	September 30, 2017						December 31, 2016
	Notional amount		Fair value				Notional amount		Fair value
(In millions)			Other assets		Other liabilities				Other assets		Other liabilities
Derivatives designated as hedging instruments:
Cash flow hedges:
Interest rate swaps	$	1,138	$	—	$	—	$	1,388	$	2	$	1
Derivatives not designated as hedging instruments:
Interest rate swaps and forwards	205		1		—		235		2		—
Interest rate swaps for customers 1	4,598		36		30		4,162		49		49
Foreign exchange	280		6		5		424		11		9
Total derivatives not designated as hedging instruments	5,083		43		35		4,821		62		58
Total derivatives	$	6,221	$	43	$	35	$	6,209	$	64	$	59

¹ Notional amounts include both the customer swaps and the offsetting derivative contracts.

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2017								Nine Months Ended September 30, 2017
(In millions)	OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)			Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	—	$	—					$	—	$	3
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts					$	—							$	(1	)
Interest rate swaps for customers					4								8
Foreign exchange					4								12
Total derivatives	$	—	$	—	$	8	$	—	$	—	$	3	$	19		$	—

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2016									Nine Months Ended September 30, 2016
(In millions)	OCI			Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	(5	)	$	3					$	23	$	9
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts						$	1							$	3
Interest rate swaps for customers						4								5
Foreign exchange						3								8
Total derivatives	$	(5	)	$	3	$	8	$	—	$	23	$	9	$	16	$	—

Note: These schedules are not intended to present at any given time the Company’s long/short position with respect to its derivative contracts.

¹  Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2017, we estimate that $2 million will be reclassified from AOCI into interest income.

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The fair value of derivative assets was reduced by a net credit valuation adjustment of $4 million and $7 million at September 30, 2017 and 2016, respectively. The adjustment for derivative liabilities was a $1 million decrease and was not significant at September 30, 2017 and 2016, respectively. These adjustments are required to reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk.

8. DEBT AND SHAREHOLDERS’ EQUITY

Long-term debt is summarized as follows:

(In millions)	September 30, 2017		December 31, 2016
Subordinated notes	$	247	$	247
Senior notes	135		287
Capital lease obligations	1		1
Total	$	383	$	535

The preceding carrying values represent the par value of the debt adjusted for any unamortized premium or discount or unamortized debt issuance costs.

Debt Redemptions and Maturities

During the first quarter of 2017, $153 million of our 4.5% senior notes matured.

During the first nine months of 2016, $89 million of our 4.0% senior notes matured. In addition, we purchased $15 million of our 4.5% senior notes and redeemed $11 million of our 3.6% senior medium-term notes.

During the third quarter of 2016 we elected to exercise our right to redeem the following junior subordinated debentures related to trust preferred securities issued to the following trusts.

(Dollar amounts in millions)	Balance Redeemed		Coupon rate 1	Redemption date
Amegy Statutory Trust I	$	51	3mL+2.85%	September 17, 2016
Amegy Statutory Trust III	62		3mL+1.78%	September 15, 2016
Stockmen’s Statutory Trust II	8		3mL+3.15%	September 26, 2016
Stockmen’s Statutory Trust III	8		3mL+2.89%	September 17, 2016
Total	$	129

¹  Designation of “3mL” is three-month London Interbank Offered Rate (“LIBOR”).

Shareholders’ Equity

During the third quarter of 2017, the Company continued its common stock buyback program and repurchased 2.5 million shares of common stock outstanding with a fair value of $115 million at an average price of $45.45 per share, and has repurchased 4.7 million shares of common stock outstanding with a fair value $205 million at an average price of $43.72 per share during the first nine months of 2017. During the first nine months of 2016, the Company repurchased 1.5 million shares of common stock outstanding with a fair value of $45 million, at an average price of $30.64 per share.

During the second quarter of 2017, we redeemed all outstanding shares of our 7.9% Series F preferred stock for a cash payment of approximately $144 million. Dividends paid to these redeemed shares amounted to $0.49375 per depositary share for a total amount of $3 million. The total one-time reduction to net earnings applicable to common shareholders associated with the preferred stock redemption was $2 million due to the accelerated recognition of preferred stock issuance costs.

On April 25, 2016, we launched a tender offer to purchase up to $120 million par amount of certain outstanding preferred stock. Our preferred stock decreased by $119 million in the second quarter of 2016 as a result of the tender offer, including the purchase of $27 million of our Series I preferred stock, $59 million of our Series J preferred stock, and $33 million of our Series G preferred stock for an aggregate cash payment of $126 million. The

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total one-time reduction to net earnings applicable to common shareholders associated with the preferred stock redemption was $10 million.

Accumulated Other Comprehensive Income

Accumulated other comprehensive income (loss) was $(57) million at September 30, 2017 compared to $(122) million at December 31, 2016. Changes in AOCI by component are as follows:

(In millions)	Net unrealized gains (losses) on investment securities			Net unrealized gains (losses) on derivatives and other			Pension and post-retirement			Total
Nine Months Ended September 30, 2017
Balance at December 31, 2016	$	(93	)	$	2		$	(31	)	$	(122	)
OCI before reclassifications, net of tax	65			2			—			67
Amounts reclassified from AOCI, net of tax	—			(2		)	—			(2		)
OCI	65			—			—			65
Balance at September 30, 2017	$	(28	)	$	2		$	(31	)	$	(57	)
Income tax expense included in OCI	$	40		$	—		$	—		$	40
Nine Months Ended September 30, 2016
Balance at December 31, 2015	$	(18	)	$	2		$	(38	)	$	(54	)
OCI (loss) before reclassifications, net of tax	54			16			(1		)	69
Amounts reclassified from AOCI, net of tax	—			(5		)	—			(5		)
OCI (loss)	54			11			(1		)	64
Balance at September 30, 2016	$	36		$	13		$	(39	)	$	10
Income tax expense included in OCI (loss)	$	34		$	6		$	1		$	41

	Amounts reclassified from AOCI 1				Amounts reclassified from AOCI 1				Statement of income (SI) Balance sheet (BS)
(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
Details about AOCI components	2017		2016		2017		2016			Affected line item
Net unrealized gains on derivative instruments	$	—	$	3	$	3	$	9	SI	Interest and fees on loans
Income tax expense	—		1		1		4
Amounts Reclassified from AOCI	$	—	$	2	$	2	$	5

¹  Positive reclassification amounts indicate increases to earnings in the statement of income and decreases to balance sheet assets.

9. COMMITMENTS, GUARANTEES AND CONTINGENT LIABILITIES

Commitments and Guarantees

Contractual amounts of off-balance sheet financial instruments used to meet the financing needs of our customers are as follows:

(In millions)	September 30, 2017		December 31, 2016
Net unfunded commitments to extend credit 1	$	18,828	$	18,274
Standby letters of credit:
Financial	709		771
Performance	202		196
Commercial letters of credit	43		60
Total unfunded lending commitments	$	19,782	$	19,301

¹  Net of participations

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The Company’s 2016 Annual Report on Form 10-K contains further information about these commitments and guarantees including their terms and collateral requirements. At September 30, 2017, the Company had recorded approximately $5 million as a liability for the guarantees associated with the standby letters of credit, which consisted of $1 million attributable to the RULC and $4 million of deferred commitment fees.

At September 30, 2017, we had unfunded commitments for PEIs of approximately $27 million. These obligations have no stated maturity. PEIs related to these commitments that are prohibited by the Volcker Rule were $4 million at September 30, 2017. See related discussions about these investments in Notes 3 and 5.

Legal Matters

We are subject to litigation in court and arbitral proceedings, as well as proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies. Litigation may relate to lending, deposit and other customer relationships, vendor and contractual issues, employee matters, intellectual property matters, personal injuries and torts, regulatory and legal compliance, and other matters. While most matters relate to individual claims, we are also subject to putative class action claims and similar broader claims. Proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies may relate to our banking, investment advisory, trust, securities, and other products and services; our customers’ involvement in money laundering, fraud, securities violations and other illicit activities or our policies and practices relating to such customer activities; and our compliance with the broad range of banking, securities and other laws and regulations applicable to us. At any given time, we may be in the process of responding to subpoenas, requests for documents, data and testimony relating to such matters and engaging in discussions to resolve the matters.

As of September 30, 2017, we were subject to the following material litigation and governmental inquiries:

• a civil suit, Shou-En Wang v. CB&T, brought against us in the Superior Court for Los Angeles County, Central District in April 2016. The case relates to our depositor relationships with customers who were promoters of an investment program that allegedly misappropriated investors’ funds. This case is in an early phase, with initial motion practice having been completed.

• a civil suit, McFarland as Trustee for International Manufacturing Group v. CB&T, et. al., brought against us in the United States Bankruptcy Court for the Eastern District of California in May 2016. The Trustee seeks to recover loan payments previously repaid to us by our customer, International Manufacturing Group (“IMG”), alleging that IMG, along with its principal, obtained loans and made loan repayments in furtherance of an alleged Ponzi scheme. This case is in an early phase with initial motion practice having been completed.

• a civil suit, JTS Communities, Inc. et. al v. CB&T, Jun Enkoji and Dawn Satow, brought against us in the Superior Court of California, Sacramento County, California in June 2017. In this case four investors in IMG seek to hold us liable for losses arising from their investments in that company, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi Scheme.

• a civil class action lawsuit, Evans v. CB&T, brought against us in the Eastern District of California in May 2017. This case was filed on behalf of a class of up to 50 investors in IMG and seeks to hold us liable for losses of class members arising from their investments in IMG, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi Scheme.

At the end of September 2017, we settled a governmental inquiry conducted by the U.S. Attorney’s Office for the Eastern District of Pennsylvania into our payment processing practices relating to certain telemarketing customers alleged to have engaged in fraudulent marketing practices, primarily in the 2006-2008 timeframe. The settlement agreement imposed a civil money penalty of $3.6 million, which was paid in the third quarter. Because this amount had been fully reserved, the settlement did not affect our third quarter financial results.

At least quarterly, we review outstanding and new legal matters, utilizing then available information. In accordance with applicable accounting guidance, if we determine that a loss from a matter is probable and the amount of the loss can be reasonably estimated, we establish an accrual for the loss. In the absence of such a determination, no accrual is made. Once established, accruals are adjusted to reflect developments relating to the matters.

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ZIONS BANCORPORATION AND SUBSIDIARIES

In our review, we also assess whether we can determine the range of reasonably possible losses for significant matters in which we are unable to determine that the likelihood of a loss is remote. Because of the difficulty of predicting the outcome of legal matters, discussed subsequently, we are able to meaningfully estimate such a range only for a limited number of matters. Based on information available as of September 30, 2017, we estimated that the aggregate range of reasonably possible losses for those matters to be from $0 millionto roughly $20 million in excess of amounts accrued. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from this estimate. Those matters for which a meaningful estimate is not possible are not included within this estimated range and, therefore, this estimated range does not represent our maximum loss exposure.

Based on our current knowledge, we believe that our current estimated liability for litigation and other legal actions and claims, reflected in our accruals and determined in accordance with applicable accounting guidance, is adequate and that liabilities in excess of the amounts currently accrued, if any, arising from litigation and other legal actions and claims for which an estimate as previously described is possible, will not have a material impact on our financial condition, results of operations, or cash flows. However, in light of the significant uncertainties involved in these matters, and the very large or indeterminate damages sought in some of these matters, an adverse outcome in one or more of these matters could be material to our financial condition, results of operations, or cash flows for any given reporting period.

Any estimate or determination relating to the future resolution of litigation, arbitration, governmental or self-regulatory examinations, investigations or actions or similar matters is inherently uncertain and involves significant judgment. This is particularly true in the early stages of a legal matter, when legal issues and facts have not been well articulated, reviewed, analyzed, and vetted through discovery, preparation for trial or hearings, substantive and productive mediation or settlement discussions, or other actions. It is also particularly true with respect to class action and similar claims involving multiple defendants, matters with complex procedural requirements or substantive issues or novel legal theories, and examinations, investigations and other actions conducted or brought by governmental and self-regulatory agencies, in which the normal adjudicative process is not applicable. Accordingly, we usually are unable to determine whether a favorable or unfavorable outcome is remote, reasonably likely, or probable, or to estimate the amount or range of a probable or reasonably likely loss, until relatively late in the course of a legal matter, sometimes not until a number of years have elapsed. Accordingly, our judgments and estimates relating to claims will change from time to time in light of developments and actual outcomes will differ from our estimates. These differences may be material.

10. RETIREMENT PLANS

The following discloses the net periodic benefit cost (credit) and its components for the Company’s pension and other retirement plans:

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest cost	$	2		$	2		$	5		$	5
Expected return on plan assets	(3		)	(3		)	(9		)	(9		)
Partial settlement loss	1			3			2			3
Amortization of net actuarial loss	1			1			4			5
Net periodic benefit cost	$	1		$	3		$	2		$	4

As disclosed in our 2016 Annual Report on Form 10-K, the Company has frozen its participation and benefit accruals for the pension plan and its contributions for individual benefit payments in the postretirement benefit plan.

During the third quarter of 2017, the Company revised its pension plan to offer certain participants a temporary opportunity to make an election to receive an immediate distribution from the pension plan. The window for this opportunity is between August 1, 2017 and November 24, 2017.

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ZIONS BANCORPORATION AND SUBSIDIARIES

11. INCOME TAXES

The effective income tax rate of 34.2% for the third quarter of 2017 was slightly higher than the 2016third quarter rate of 33.9%. The effective tax rates for the first nine months of 2017 and 2016 were 30.6% and 33.3%, respectively. These tax rates for both 2017 and 2016 generally benefited from the non-taxability of certain income items. The 2017 effective tax rate was further impacted by the following factors:

• We re-evaluated our state tax positions in the first quarter of 2017, which resulted in a one-time $14 million benefit to income tax expense.

• We reduced income tax expense by $4 million in the second quarter of 2017 due to changes in the carrying value of various state deferred tax items.

• We also recorded an $8 million benefit in the first nine months of 2017 from the implementation of new accounting guidance related to stock-based compensation.

We had a net deferred tax asset (“DTA”) balance of $207 million at September 30, 2017, compared with $250 million at December 31, 2016, which included a $4 million valuation allowance at each respective reporting date for certain acquired net operating loss carryforwards included in our acquisition of the remaining interest in a less significant subsidiary. We evaluate deferred tax assets on a regular basis to determine whether an additional valuation allowance is required. Based on this evaluation, and considering the weight of the positive evidence compared to the negative evidence, we have concluded that an additional valuation allowance is not required as of September 30, 2017.

12. OPERATING SEGMENT INFORMATION

We manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process continues to be refined. Total average loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment. Prior period amounts have been reclassified to reflect these changes.

As of September 30, 2017, Zions Bank operates 98 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. Amegy operates 73 branches in Texas. CB&T operates 92 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates one branch in Washington and one branch in Oregon.

The operating segment identified as “Other” includes the Parent, Zions Management Services Company, certain nonbank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments. Throughout 2016 consolidation efforts continued, which resulted in transitioning full-time equivalents from the business segments to the Company’s back-office units. Due to the continuing nature and timing of this change, the Company’s back-office units retained more direct expenses in 2016 than in prior years. In the first quarter of 2017 we made changes to the FTP process and internal allocation of central expenses to better reflect the performance of business segments. Prior period amounts have been revised to reflect the impact of these changes had they been instituted in 2016.

The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Parent’s net interest income includes interest expense on other borrowed funds. The condensed statement of income

78

ZIONS BANCORPORATION AND SUBSIDIARIES

identifies the components of income and expense which affect the operating amounts presented in the Other segment.

The accounting policies of the individual operating segments are the same as those of the Company. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations.

The following schedule presents selected operating segment information for the three months ended September 30, 2017 and 2016:

(In millions)	Zions Bank						Amegy				CB&T						NBAZ					NSB
	2017			2016			2017		2016		2017			2016			2017			2016		2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	164		$	157		$	122	$	114	$	118		$	110		$	53		$	48	$	34		$	31
Provision for loan losses	(15		)	(1		)	33		24		(4		)	(2		)	(8		)	—		(3		)	(4		)
Net interest income after provision for loan losses	179			158			89		90		122			112			61			48		37			35
Noninterest income	39			39			28		32		20			18			10			11		11			10
Noninterest expense	107			108			86		75		74			75			38			36		35			34
Income (loss) before income taxes	$	111		$	89		$	31	$	47	$	68		$	55		$	33		$	23	$	13		$	11
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	12,543		$	12,629		$	11,170	$	10,666	$	9,575		$	9,341		$	4,267		$	4,156	$	2,347		$	2,288
Total deposits	15,773			15,948			10,862		11,068		11,021			10,929			4,816			4,632		4,276			4,223
(In millions)	Vectra						TCBW				Other						Consolidated Company
	2017			2016			2017		2016		2017			2016			2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	32		$	31		$	12	$	10	$	(13	)	$	(32	)	$	522		$	469
Provision for loan losses	—			2			3		—		(1		)	—			5			19
Net interest income after provision for loan losses	32			29			9		10		(12		)	(32		)	517			450
Noninterest income	7			6			1		1		23			28			139			145
Noninterest expense	25			25			5		5		43			45			413			403
Income (loss) before income taxes	$	14		$	10		$	5	$	6	$	(32	)	$	(49	)	$	243		$	192
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	2,683		$	2,489		$	939	$	796	$	308		$	122		$	43,832		$	42,487
Total deposits	2,757			2,663			1,098		1,010		1,318			202			51,921			50,675

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ZIONS BANCORPORATION AND SUBSIDIARIES

The following schedule presents selected operating segment information for the nine months ended September 30, 2017 and 2016:

(In millions)	Zions Bank					Amegy				CB&T						NBAZ					NSB
	2017		2016			2017		2016		2017			2016			2017			2016		2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	483	$	462		$	359	$	344	$	351		$	322		$	153		$	140	$	98		$	91
Provision for loan losses	18		(31		)	41		159		(10		)	(1		)	(7		)	2		(8		)	(29		)
Net interest income after provision for loan losses	465		493			318		185		361			323			160			138		106			120
Noninterest income	112		112			87		90		56			51			29			30		30			29
Noninterest expense	327		320			259		244		225			221			111			109		105			104
Income (loss) before income taxes	$	250	$	285		$	146	$	31	$	192		$	153		$	78		$	59	$	31		$	45
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	12,505	$	12,512		$	10,890	$	10,599	$	9,453		$	9,170		$	4,258		$	4,010	$	2,352		$	2,275
Total deposits	16,001		15,866			11,131		11,100		10,953			10,764			4,747			4,553		4,240			4,113
(In millions)	Vectra					TCBW				Other						Consolidated Company
	2017		2016			2017		2016		2017			2016			2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	93	$	90		$	34	$	28	$	(32	)	$	(91	)	$	1,539		$	1,386
Provision for loan losses	—		(4		)	2		—		(1		)	(1		)	35			95
Net interest income after provision for loan losses	93		94			32		28		(31		)	(90		)	1,504			1,291
Noninterest income	19		17			3		3		68			56			404			388
Noninterest expense	75		73			16		15		114			95			1,232			1,181
Income (loss) before income taxes	$	37	$	38		$	19	$	16	$	(77	)	$	(129	)	$	676		$	498
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	2,607	$	2,453		$	909	$	769	$	244		$	80		$	43,218		$	41,868
Total deposits	2,758		2,704			1,098		970		1,227			(8		)	52,155			50,062

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest rate and market risks are among the most significant risks regularly undertaken by us, and they are closely monitored as previously discussed. A discussion regarding our management of interest rate and market risk is included in the section entitled “Interest Rate and Market Risk Management” in this Form 10-Q.

ITEM 4. CONTROLS AND PROCEDURES

The Company’s management, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures as of September 30, 2017. Based on that evaluation, the Company’s Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures were effective as of September 30, 2017. There were no changes in the Company’s internal control over financial reporting during the third quarter of 2017 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

The information contained in Note 9 of the Notes to Consolidated Financial Statements is incorporated by reference herein.

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ZIONS BANCORPORATION AND SUBSIDIARIES

ITEM 1A. RISK FACTORS

We believe there have been no material changes in the risk factors included in Zions Bancorporation’s 2016 Annual Report on Form 10-K.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following schedule summarizes the Company’s share repurchases for the third quarter of 2017:

SHARE REPURCHASES

Period	Total number of shares repurchased 1		Average price paid per share		Total number of shares purchased as part of publicly announced plans or programs		Approximate dollar value of shares that may yet be  purchased under the plan
July		504,117	$	45.32		502,400		$	442,230,302
August		2,034,567	45.38			2,027,832		350,000,045
September		508	45.89			—		350,000,045
Third quarter		2,539,192	45.45			2,530,232

¹  Represents common shares acquired from employees in connection with our stock compensation plan in addition to shares acquired under previously reported share repurchase plans. Shares were acquired from employees to pay for their payroll taxes and stock option exercise cost upon the vesting of restricted stock and restricted stock units, and the exercise of stock options, under provisions of an employee share-based compensation plan.

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ZIONS BANCORPORATION AND SUBSIDIARIES

ITEM 6. EXHIBITS

a)Exhibits

Exhibit Number	Description
3.1	Restated Articles of Incorporation of Zions Bancorporation dated July 8, 2014, incorporated by reference to Exhibit 3.1 of Form 8-K/A filed on July 18, 2014.	*
3.2	Restated Bylaws of Zions Bancorporation dated February 27, 2015, incorporated by reference to Exhibit 3.2 of Form 10-Q for the quarter ended March 31, 2015.	*
31.1	Certification by Chief Executive Officer required by Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934 (filed herewith).
31.2	Certification by Chief Financial Officer required by Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934 (filed herewith).
32	Certification by Chief Executive Officer and Chief Financial Officer required by Sections 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 (15 U.S.C. 78m) and 18 U.S.C. Section 1350 (furnished herewith).
101	Interactive data files pursuant to Rule 405 of Regulation S-T: (i) the Consolidated Balance Sheets as of September 30, 2017 and December 31, 2016, (ii) the Consolidated Statements of Income for the three months ended September 30, 2017 and September 30, 2016 and the nine months ended September 30, 2017 and September 30, 2016, (iii) the Consolidated Statements of Comprehensive Income for the three months ended September 30, 2017 and September 30, 2016 and the nine months ended September 30, 2017 and September 30, 2016, (iv) the Consolidated Statements of Changes in Shareholders’ Equity for the nine months ended September 30, 2017 and September 30, 2016, (v) the Consolidated Statements of Cash Flows for the three months ended September 30, 2017 and September 30, 2016 and the nine months ended September 30, 2017 and September 30, 2016 and (vi) the Notes to Consolidated Financial Statements (filed herewith).

* Incorporated by reference

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

ZIONS BANCORPORATION

/s/ Harris H. Simmons

Harris H. Simmons, Chairman and

Chief Executive Officer

/s/ Paul E. Burdiss

Paul E. Burdiss, Executive Vice President and Chief Financial Officer

Date: November 8, 2017

83

EX-31.1

EXHIBIT 31.1

CERTIFICATION

Principal Executive Officer

I, Harris H. Simmons, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Zions Bancorporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 8, 2017

/s/ Harris H. Simmons

Harris H. Simmons, Chairman and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION

Principal Financial Officer

I, Paul E. Burdiss, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Zions Bancorporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 8, 2017

/s/ Paul E. Burdiss

Paul E. Burdiss, Executive Vice President and Chief Financial Officer

EX-32

EXHIBIT 32

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. §1350, the undersigned officers of Zions Bancorporation (the “Company”) hereby certify that, to the best of their knowledge, the Company’s Quarterly Report for the three months ended September 30, 2017 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 (15 U.S.C. 78m) and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 8, 2017

/s/ Harris H. Simmons
Name:	Harris H. Simmons
Title:	Chairman and Chief Executive Officer
/s/ Paul E. Burdiss
Name:	Paul E. Burdiss
Title:	Executive Vice President and Chief Financial Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. §1350 and is not being filed as part of the Report or as a separate disclosure document.

XML

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Trading Symbol	zion
Entity Registrant Name	ZIONS BANCORPORATION /UT/
Entity Central Index Key	0000109380
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		199,743,776

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Held-to-maturity, fair value	$ 743	$ 850
ASSETS
Cash and due from banks	541	737
Money market investments:
Interest-bearing deposits	765	1,411
Federal funds sold and security resell agreements	467	568
Investment securities:
Held-to-maturity, at amortized cost	746	868
Available-for-sale, at fair value	15,242	13,372
Trading account, at fair value	56	115
Total investment securities	16,044	14,355
Loans held for sale	71	172
Loans held for investment, net of allowance
Loans and leases, net of unearned income and fees	44,156	42,649
Less allowance for loan losses	541	567
Loans held for investment, net of allowance	43,615	42,082
Other noninterest-bearing investments	1,008	884
Premises, equipment and software, net	1,083	1,020
Goodwill	1,014	1,014
Core deposit and other intangibles	3	8
Other real estate owned	3	4
Other assets	950	984
Total assets	65,564	63,239
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	24,011	24,115
Interest-bearing:
Savings and money market	25,179	26,364
Time	2,909	2,757
Total deposits	52,099	53,236
Federal funds and other short-term borrowings	4,624	827
Long-term debt	383	535
Reserve for unfunded lending commitments	59	65
Other liabilities	638	942
Total liabilities	57,803	55,605
Shareholders' equity:
Preferred stock, without par value	566	710
Common stock, without par value	4,552	4,725
Retained earnings	2,700	2,321
Accumulated other comprehensive income (loss)	(57)	(122)
Stockholders' Equity	7,761	7,634
Total liabilities and shareholders' equity	$ 65,564	$ 63,239

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Held-to-maturity, fair value	$ 743	$ 850
Preferred stock, authorized shares	4,400,000	4,400,000
Common stock, authorized shares	350,000,000	350,000,000
Common stock, issued shares	199,712,000	203,085,000
Common stock, outstanding shares	199,712,000	203,085,000

XML

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest and Fees and Loans	$ 468	$ 437	$ 1,370	$ 1,291
Interest on Money Market Investments	5	5	14	18
Interest income:
Interest on Securities	84	49	246	143
Total Interest Income	557	491	1,630	1,452
Interest on Deposits	15	13	43	36
Interest on short- and long-term borrowings	20	9	48	30
Total Interest Expense	35	22	91	66
Net interest Income	522	469	1,539	1,386
Provision for loan losses	5	19	35	95
Interest expense:
Net interest income after provision for loan losses	517	450	1,504	1,291
Service Charges and Fees on Deposit Accounts	42	45	127	128
Other Service Charges, Commissions and Fees	55	54	160	156
Wealth Management Income	11	10	30	27
Loan Sales and Servicing Income	6	11	19	29
Captial Markets and Foreign Exchange	8	6	21	16
Customer-related Fees	122	126	357	356
Dividends and Other Investment Income	9	9	31	20
Securities Gains, Net	5	8	13	11
Other	3	2	3	1
Noninterest income:
Total Noninterest Income	139	145	404	388
Noninterest expense:
Salaries and Employee Benefits	253	242	756	742
Occupancy, Net	35	33	101	93
Furniture, Equipment, and Software, Net	32	29	96	92
Other real estate expense, net	1	0	1	2
Credit-Related Expense	7	7	23	19
Provision for unfunded lending commitments	(4)	(3)	(6)	(13)
Professional and Legal Fees	14	14	42	38
Advertising	6	6	17	17
FDIC Premiums	15	12	40	28
Amortization of Core Deposit and Other Intangible Assets	2	2	5	6
Other	54	61	159	161
Total Noninterest Expense	413	403	1,232	1,181
Income Before Income Taxes	243	192	676	498
Income taxes	83	65	207	166
Net income	160	127	469	332
Preferred Stock Dividends	(8)	(10)	(30)	(36)
Preferred Stock Redemption	0	0	(3)	(10)
Net Earnings Available to Common Shareholders	$ 152	$ 117	$ 436	$ 286
Weighted average common shares outstanding during the period:
Basic Shares (in thousands)	200,332	204,312	201,493	204,180
Diluted Shares (in Thousands)	209,106	204,714	209,366	204,425
Earnings Per Common Share, Basic	$ 0.75	$ 0.57	$ 2.14	$ 1.39
Earnings Per Common Share, Diluted	$ 0.72	$ 0.57	$ 2.06	$ 1.39

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Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income for the period	$ 160	$ 127	$ 469	$ 332
Other comprehensive income, net of tax:
Unrealized holding gains (losses) on investment securities	(8)	(11)	65	54
Net unrealized gains on other noninterest-bearing investments	0	2	2	2
Net unrealized holding gains (losses) on derivative instruments	0	(3)	0	14
Reclassification adjustment for increase in interest income recognized in earnings on derivatives instruments	0	(2)	(2)	(5)
Pension and Postretirement	0	0	0	(1)
Other comprehensive income (loss)	(8)	(14)	65	64
Comprehensive income	$ 152	$ 113	$ 534	$ 396

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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	$ 7,507	$ 828	$ 4,767	$ 1,967	$ (55)
Balance (in shares) at Dec. 31, 2015			204,417,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	332			332
Other comprehensive income, net of tax	64				64
Preferred Stock Redemption	(126)	(118)	$ 2	(10)
Stock Issued During Period, Value, Conversion of Convertible Securities	(45)		$ (45)
Company Common Stock Repurchased	$ (45)
Company Common Stock Repurchased, Shares	1,500,000		(1,469,000)
Net activity under employee plans and related tax benefits	$ 24		$ 24
Net activity under employee plans and related tax benefits, shares			902,000
Dividends on preferred stock	(36)			(36)
Dividends on common stock	(41)			(41)
Change in deferred compensation	0			0
Balance (in shares) at Sep. 30, 2016			203,850,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	7,679	710	$ 4,748	2,212	9
Stockholders' Equity	$ 7,634	710	$ 4,725	2,321	(122)
Balance (in shares) at Dec. 31, 2016	203,085,000		203,085,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	$ 469			469
Other comprehensive income, net of tax	65				65
Preferred Stock Redemption	(144)	(144)	$ 2	(2)
Company Common Stock Repurchased	$ (205)		$ (205)
Company Common Stock Repurchased, Shares	5,000,000		(4,689,000)
Net activity under employee plans and related tax benefits	$ 30		$ 30
Net activity under employee plans and related tax benefits, shares			1,316,000
Dividends on preferred stock	(30)			(30)
Dividends on common stock	$ (58)			(58)
Balance (in shares) at Sep. 30, 2017	199,712,000		199,712,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	$ 7,761	$ 566	$ 4,552	$ 2,700	$ (57)

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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Common Stock, Dividends, Per Share, Cash Paid	$ 0.28	$ 0.20

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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$ 160	$ 127	$ 469	$ 332
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	1	16	29	82
Depreciation and amortization	47	34	131	88
Share-based Compensation	4	6	21	22
Deferred income tax expense (benefit)	(4)	2	4	(9)
Net decrease (increase) in trading securities	5	11	59	(60)
Net decrease (increase) in loans held for sale	(18)	(12)	71	(9)
Change in other liabilities	84	52	63	215
Change in other assets	(42)	(4)	(9)	(222)
Other, net	(10)	(19)	(35)	(24)
Net cash provided by operating activities	227	213	803	415
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	363	(389)	748	3,563
Proceeds from maturities and paydowns of investment securities held-to-maturity	83	34	249	66
Purchases of investment securities held-to-maturity	(54)	(35)	(127)	(235)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	615	683	1,775	3,257
Purchases of investment securities available-for-sale	(535)	(1,607)	(4,001)	(5,974)
Net change in loans and leases	(475)	(58)	(1,511)	(1,956)
Net change in other noninterest-bearing investments	14	(26)	(89)	(29)
Purchases of premises and equipment	(39)	(51)	(133)	(143)
Proceeds from sales of other real estate owned	3	6	7	15
Other, net	1	2	5	5
Net cash used in investing activities	(24)	(1,441)	(3,077)	(1,431)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	(278)	575	(1,136)	496
Net change in short-term funds borrowed	(718)	845	1,297	768
Proceeds from debt over 90 days and up to one year	1,850	0	3,600	0
Repayments of debt over 90 days and up to one year	(850)	0	(1,100)	0
Cash paid for preferred stock redemption	0	0	(144)	(126)
Repayments of long-term debt	0	(129)	(153)	(244)
Proceeds from Issuance of Common Stock	2	5	20	8
Dividends paid on common and preferred stock	(34)	(31)	(89)	(81)
Company common stock repurchased	(115)	(45)	(217)	(51)
Other, Net	0	1	0	1
Net cash provided by (used in) financing activities	(143)	1,221	2,078	771
Net increase (decrease) in cash and due from banks	60	(7)	(196)	(245)
Cash and due from banks at beginning of period	481	560	737	798
Cash and due from banks at end of period	541	553	541	553
Cash paid for interest	27	18	79	61
Net cash paid for income taxes	84	53	206	154
Loans Held for Investment Transferred to Other Real Estate Owned	1	6	5	13
Loans Held for Investment Reclassified to Loans Held for Sale, Net	1	40	14	36
Available for sale securities purchased, not settled	25	0	81	0
Held to Maturity Securities Purchased, Not Settled	$ 0	$ 0	$ 31	$ 0

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Basis of Presentaion

9 Months Ended

Sep. 30, 2017

Basis Of Presentation [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements of Zions Bancorporation (“the Parent”) and its majority-owned subsidiaries (collectively “the Company,” “Zions,” “we,” “our,” “us”) have been prepared in accordance with 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, they 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 have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”), are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force (“EITF”). In certain cases, ASUs are issued jointly with International Financial Reporting Standards (“IFRS”).

Operating results for the nine months endedSeptember 30, 2017 and 2016 are not necessarily indicative of the results that may be expected in future periods. In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated balance sheet at December 31, 2016 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s 2016 Annual Report on Form 10-K. Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income or shareholders’ equity.

Zions Bancorporation (“the Parent”) is a financial holding company headquartered in Salt Lake City, Utah, which owns and operates a commercial bank. The Parent and its subsidiaries (collectively “the Company”) provide a full range of banking and related services in 11 Western and Southwestern states through seven separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Bank (“Amegy”), in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon (“TCBO”) in Oregon. The Parent also owns and operates certain nonbank subsidiaries that engage in financial services.

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Certain Recent Accounting Pronouncements (Notes)

9 Months Ended

Sep. 30, 2017

Certain Recent Accounting Pronouncements [Abstract]

Certain Recent Accounting Pronouncements [Text Block]

RECENT ACCOUNTING PRONOUNCEMENTS

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards not yet adopted by the Company
ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and subsequent related ASUs	The core principle of the new guidance is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The banking industry does not expect significant changes because major sources of revenue are from financial instruments that have been excluded from the scope of the new standard, (including loans, derivatives, debt and equity securities, etc.). However, these new standards affect other fees charged by banks, such as asset management fees, credit card interchange fees, deposit account fees, etc. Adoption may be made on a full retrospective basis with practical expedients, or on a modified retrospective basis with a cumulative effect adjustment.	January 1, 2018	Approximately 85% of our revenue, including all of our interest income and a portion of our noninterest income, is out of scope of the guidance. The contracts that are in scope of the guidance are primarily related to service charges and fees on deposit accounts, wealth management income, and other service charges, commissions and fees. We have completed our review of these contracts and have not identified any material changes in the timing of revenue recognition. We plan to adopt this guidance using the modified retrospective transition method, and we expect to expand our qualitative disclosures of revenue recognition upon adoption.
ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	The standard provides revised accounting guidance related to the accounting for and reporting of financial instruments. Some of the main provisions include: – Equity investments that do not result in consolidation and are not accounted for under the equity method would be measured at fair value through net income – Changes in instrument-specific credit risk for financial liabilities that are measured under the fair value option would be recognized in other comprehensive income (“OCI”). – Elimination of the requirement to disclose the methods and significant assumptions used to estimate the fair value of financial instruments carried at amortized cost. However, it will require the use of exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes.	January 1, 2018	We do not have a significant amount of equity securities classified as available-for-sale (“AFS”). Additionally, we do not have any financial liabilities accounted for under the fair value option. Therefore, the transition adjustment upon adoption of this guidance is not expected to be material. We are refining our valuation models to better account for an exit price, but do not expect a significant change in our disclosure.
ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	The purpose of this standard is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The standard is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. The standard requires a modified retrospective transition method that requires recognition of the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption.	January 1, 2018	While we continue to assess all potential impacts of the standard, we currently do not expect adoption of this guidance to have a material impact on our consolidated financial statements. We are still evaluating when to adopt this guidance.

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards not yet adopted by the Company (continued)
ASU 2016-02, Leases (Topic 842)	The standard requires that a lessee recognize assets and liabilities for leases with lease terms of more than 12 months. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, the standard will require both types of leases to be recognized on the balance sheet. It also requires disclosures to better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements.	January 1, 2019	We are currently evaluating the potential impact of this guidance on the Company’s financial statements. As of December 31, 2016, the Company had minimum noncancelable net operating lease payments of $275 million that are being evaluated. The implementation team is working on gathering all key lease data elements to meet the requirements of the new guidance. Additionally, we are implementing new lease software that will accommodate the new accounting requirements.
ASU 2017-08, Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities	The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. The standard requires the premium to be amortized to the earliest call date. The update does not change the accounting for securities held at a discount.	January 1, 2019	Our initial analysis suggests this guidance will not have a material impact on the Company’s financial statements, but we will continue to monitor its impact as we move closer to implementation.
ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	The standard significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The standard replaces today’s “incurred loss” approach with an “expected loss” model for instruments such as loans and held-to-maturity (“HTM”) securities that are measured at amortized cost. The standard requires credit losses relating to AFS debt securities to be recorded through an allowance for credit losses (“ACL”) rather than a reduction of the carrying amount. It also changes the accounting for purchased credit-impaired debt securities and loans. The standard retains many of the current disclosure requirements in current GAAP and expands certain disclosure requirements. Early adoption of the guidance is permitted as of January 1, 2019.	January 1, 2020	We have formed an implementation team led jointly by Credit and the Corporate Controller’s group, that also includes other lines of business and functions within the Company. The implementation team is working on developing models that can meet the requirements of the new guidance. While this standard may potentially have a material impact on the Company’s financial statements, we are still in process of conducting our evaluation.
ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	The standard eliminates the requirement to calculate the implied fair value of goodwill (i.e. Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, entities would record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current guidance). The standard does not change the guidance on completing Step 1 of the goodwill impairment test. The standard also continues to allow entities to perform the optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The standard is effective for the Company as of January 1, 2020. Early adoption is allowed for any goodwill impairment test performed after January 1, 2017.	January 1, 2020	We do not currently expect this guidance will have a material impact on the Company’s financial statements since the fair values of our reporting units were not lower than their respective carrying amounts at the time of our goodwill impairment analysis for 2016.

Standards adopted by the Company
ASU 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting	The standard requires entities to recognize the income tax effects of share-based awards in the income statement when the awards vest or are settled (i.e. the additional paid-in capital pools will be eliminated). The standard provides an entity the option to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. The standard also requires that excess tax benefits be reflected in the operating section of the statement of cash flows rather than the investing section and to make an election to adopt this requirement either on a retrospective or prospective basis.	January 1, 2017	Upon adoption of this ASU, there was no material impact from the cumulative effect adjustment to retained earnings. We elected to account for forfeitures when they occur and to reflect excess tax benefits in the operating section of the statement of cash flows on a prospective basis.

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Fair Value

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value

R VALUE

Fair Value Measurement

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. For a discussion of the Company’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 20 of our 2016 Annual Report on Form 10-K.

Quantitative Disclosure by Fair Value Hierarchy

Assets and liabilities measured at fair value by class on a recurring basis are summarized as follows:

(In millions)	September 30, 2017
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,814	$	—	$	13,839
Municipal securities			1,291				1,291
Other debt securities			25				25
Money market mutual funds and other	86		1				87
	111		15,131		—		15,242
Trading account			56				56
Other noninterest-bearing investments:
Bank-owned life insurance			504				504
Private equity investments					93		93
Other assets:
Agriculture loan servicing and interest-only strips					19		19
Deferred compensation plan assets	97						97
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			36				36
Foreign currency exchange contracts	6						6
	6		37		—		43
	$	214	$	15,728	$	112	$	16,054
LIABILITIES
Securities sold, not yet purchased	$	48	$	—	$	—	$	48
Other liabilities:
Deferred compensation plan obligations	97						97
Derivatives:
Interest rate swaps for customers			30				30
Foreign currency exchange contracts	5						5
	5		30		—		35
	$	150	$	30	$	—	$	180

¹We used a third-party pricing service to measure fair value for approximately 92% of our AFS Level 2 securities.

(In millions)	December 31, 2016
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	—	$	12,009	$	—	$	12,009
Municipal securities			1,154				1,154
Other debt securities			24				24
Money market mutual funds and other	184		1				185
	184		13,188		—		13,372
Trading account			115				115
Other noninterest-bearing investments:
Bank-owned life insurance			497				497
Private equity investments 2	18				73		91
Other assets:
Agriculture loan servicing and interest-only strips					20		20
Deferred compensation plan assets	91						91
Derivatives:
Interest rate swaps and forwards			4				4
Interest rate swaps for customers			49				49
Foreign currency exchange contracts	11						11
	11		53		—		64
	$	304	$	13,853	$	93	$	14,250
LIABILITIES
Securities sold, not yet purchased	$	25	$	—	$	—	$	25
Other liabilities:
Deferred compensation plan obligations	91						91
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			49				49
Foreign currency exchange contracts	9						9
	9		50		—		59
	$	125	$	50	$	—	$	175

¹We used a third-party pricing service to measure fair value for approximately 91% of our AFS Level 2 securities.

² The Level 1 private equity investments amount relates to the portion of our SBIC investments that are now publicly traded.

Level 3 Valuations

Private Equity Investments

Private equity investments are generally measured under Level 3. Certain investments that have converted to being publicly traded are measured under Level 1. The majority of these private equity investments (“PEIs”) are held in Zions’ Small Business Investment Company (“SBIC”) and are early stage venture investments. The fair value measurements of these investments are updated at least on a quarterly basis, including whenever a new round of financing occurs. Certain of these investments are measured using multiples of operating performance. The fair value measurements of PEIs are reviewed on a quarterly basis by the Securities Valuation Committee. The Equity Investments Committee, consisting of executives familiar with the investments, reviews periodic financial information, including audited financial statements when available.

Certain valuation analytics may be employed that include current and projected financial performance, recent financing activities, economic and market conditions, market comparables, market liquidity, sales restrictions, and other factors. A significant change in the expected performance of the individual investment would result in a change in the fair value measurement of the investment. The amount of unfunded commitments to invest is disclosed in Note 5. Certain restrictions apply for the redemption of these investments and certain investments are prohibited by the Volcker Rule. See discussions in Note 5.

Agriculture Loan Servicing

This asset results from our servicing of agriculture loans approved and funded by Federal Agricultural Mortgage Corporation (“FAMC”). We provide this servicing under an agreement with FAMC for loans they own. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.

Interest-Only Strips

Interest-only strips are created as a by-product of the securitization process. When the guaranteed portions of Small Business Administration (“SBA”) 7(a) loans are pooled, interest-only strips may be created in the pooling process. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.

Reconciliation of Level 3 Fair Value Measurements

The following reconciles the beginning and ending balances of assets and liabilities that are measured at fair value by class on a recurring basis using Level 3 inputs:

	Level 3 Instruments
	Three Months Ended								Nine Months Ended
	September 30, 2017				September 30, 2016				September 30, 2017						September 30, 2016
(In millions)	Private equity investments		Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments			Ag loan svcg and int-only strips			Private equity investments		Ag loan svcg and int-only strips
Balance at beginning of period	$	82	$	19	$	64	$	18	$	73		$	20		$	58	$	14
Securities gains, net	5		—		1		—		7			—			3		—
Other noninterest income	—		—		—		2		—			(1		)	—		6
Purchases	6		—		2		—		18			—			6		—
Redemptions and paydowns	—		—		—		—		(5		)	—			—		—
Balance at end of period	$	93	$	19	$	67	$	20	$	93		$	19		$	67	$	20

No transfers of assets or liabilities occurred among Levels 1, 2 or 3 for the three and nine months ended September 30, 2017 and 2016.

The reconciliation of Level 3 instruments includes the following realized gains in the statement of income:

(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Securities gains, net	$	—	$	4	$	3	$	4

Nonrecurring Fair Value Measurements

Included in the balance sheet amounts are the following amounts of assets that had fair value changes measured on a nonrecurring basis.

(In millions)	Fair value at September 30, 2017								Fair value at December 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS
Private equity investments	$	—	$	—	$	1	$	1	$	—	$	—	$	1	$	1
Impaired loans	—		17		—		17		—		52		—		52
Other real estate owned	—		—		—		—		—		1		—		1
	$	—	$	17	$	1	$	18	$	—	$	53	$	1	$	54

The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value.

	Gains (losses) from fair value changes
(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
ASSETS
Private equity investments	$	—		$	—		$	(1	)	$	—
Impaired loans	(1		)	(5		)	(8		)	(34		)
Other real estate owned	—			(1		)	—			(1		)
	$	(1	)	$	(6	)	$	(9	)	$	(35	)

During the three and nine months endedSeptember 30, we recognized $1 million and $2 million of net gains in 2017 and an insignificant amount and $3 million in 2016 from the sale of other real estate owned (“OREO”) properties that had a carrying value at the time of sale of approximately $5 million and $8 million during the nine months endedSeptember 30, 2017 and 2016, respectively. Previous to their sale in these periods, we recognized impairment on these properties of an insignificant amount in 2017 and 2016.

Private equity investments carried at cost were measured at fair value for impairment purposes according to the methodology previously discussed for these investments. Amounts of PEIs carried at cost were $10 million at September 30, 2017 and $13 million at December 31, 2016. Amounts of other noninterest-bearing investments carried at cost were $324 million at September 30, 2017 and $211 million at December 31, 2016, which were comprised of Federal Reserve and Federal Home Loan Bank (“FHLB”) stock. Private equity investments accounted for using the equity method were $35 million at September 30, 2017 and $38 million at December 31, 2016.

Impaired (or nonperforming) loans that are collateral dependent were measured at fair value based on the fair value of the collateral. OREO was measured initially at fair value based on collateral appraisals at the time of transfer and subsequently at the lower of cost or fair value. For additional information regarding the measurement of fair value for impaired loans, collateral-dependent loans, and OREO, see Note 20 of our 2016 Annual Report on Form 10-K.

Fair Value of Certain Financial Instruments

Following is a summary of the carrying values and estimated fair values of certain financial instruments:

	September 30, 2017					December 31, 2016
(In millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
HTM investment securities	$	746	$	743	2	$	868	$	850	2
Loans and leases (including loans held for sale), net of allowance	43,686		43,196		3	42,254		42,111		3
Financial liabilities:
Time deposits	2,909		2,890		2	2,757		2,744		2
Other short-term borrowings	3,250		3,250		2	500		500		2
Long-term debt	383		406		2	535		552		2

This summary excludes financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis. For additional information regarding the financial instruments within the scope of this disclosure, and the methods and significant assumptions used to estimate their fair value, see Note 20 of our 2016 Annual Report on Form 10-K.

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Offsetting Assets and Liabilities (Notes)

9 Months Ended

Sep. 30, 2017

Offsetting Assets and Liabilities [Abstract]

Cash, Cash Equivalents, and Short-term Investments [Text Block]

OFFSETTING ASSETS AND LIABILITIES

Gross and net information for selected financial instruments in the balance sheet is as follows:

	September 30, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	779	$	(312	)	$	467	$	—		$	—		$	467
Derivatives (included in other assets)	43		—			43		(15		)	—			28
Total assets	$	822	$	(312	)	$	510	$	(15	)	$	—		$	495
Liabilities:
Federal funds and other short-term borrowings	$	4,936	$	(312	)	$	4,624	$	—		$	—		$	4,624
Derivatives (included in other liabilities)	35		—			35		(15		)	(11		)	9
Total Liabilities	$	4,971	$	(312	)	$	4,659	$	(15	)	$	(11	)	$	4,633

	December 31, 2016
(In millions)							Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	568	$	—	$	568	$	—		$	—		$	568
Derivatives (included in other assets)	64		—		64		(17		)	—			47
Total assets	$	632	$	—	$	632	$	(17	)	$	—		$	615
Liabilities:
Federal funds and other short-term borrowings	$	827	$	—	$	827	$	—		$	—		$	827
Derivatives (included in other liabilities)	59		—		59		(17		)	(17		)	25
Total Liabilities	$	886	$	—	$	886	$	(17	)	$	(17	)	$	852

Security repurchase and reverse repurchase (“resell”) agreements are offset, when applicable, in the balance sheet according to master netting agreements. Security repurchase agreements are included with “Federal funds and other short-term borrowings.” Derivative instruments may be offset under their master netting agreements; however, for accounting purposes, we present these items on a gross basis in the Company’s balance sheet. See Note 7 for further information regarding derivative instruments.

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Investment Securities

9 Months Ended

Sep. 30, 2017

Investments [Abstract]

Investment Securities

INVESTMENTS

Investment Securities

Securities are classified as HTM, AFS or trading. HTM securities, which management has the intent and ability to hold until maturity, are carried at amortized cost. AFS securities are carried at fair value and unrealized gains and losses are reported as net increases or decreases to accumulated other comprehensive income (“AOCI”). Realized gains and losses on AFS securities are determined by using the cost basis of each individual security. Trading securities are carried at fair value with gains and losses recognized in current period earnings. The purchase premiums and discounts for both HTM and AFS securities are amortized and accreted at a constant effective yield to the contractual maturity date and no assumption is made concerning prepayments. As principal prepayments occur, the portion of the unamortized premium or discount associated with the principal reduction is recognized as interest income in the period the principal is reduced. Note 20 of our 2016 Annual Report on Form 10-K discusses the process to estimate fair value for investment securities.

	September 30, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	746	$	7	$	10	$	743
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,839		5		4		1,840
Agency guaranteed mortgage-backed securities	9,748		21		86		9,683
Small Business Administration loan-backed securities	2,281		19		9		2,291
Municipal securities	1,281		15		5		1,291
Other debt securities	25		—		—		25
	15,199		60		104		15,155
Money market mutual funds and other	87		—		—		87
	15,286		60		104		15,242
Total	$	16,032	$	67	$	114	$	15,985

	December 31, 2016
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	868	$	5	$	23	$	850
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	1,846		2		9		1,839
Agency guaranteed mortgage-backed securities	7,986		7		110		7,883
Small Business Administration loan-backed securities	2,298		8		18		2,288
Municipal securities	1,182		1		29		1,154
Other debt securities	25		—		1		24
	13,337		18		167		13,188
Money market mutual funds and other	184		—		—		184
	13,521		18		167		13,372
Total	$	14,389	$	23	$	190	$	14,222

Maturities

The amortized cost and estimated fair value of investment debt securities are shown subsequently as of September 30, 2017, by expected timing of principal payments. Actual principal payments may differ from contractual or expected principal payments because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	September 30, 2017
	Held-to-maturity				Available-for-sale
(In millions)	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value
Principal return in one year or less	$	99	$	100	$	2,296	$	2,285
Principal return after one year through five years	282		284		5,406		5,384
Principal return after five years through ten years	186		188		4,784		4,779
Principal return after ten years	179		171		2,713		2,707
Total	$	746	$	743	$	15,199	$	15,155

The following is a summary of the amount of gross unrealized losses for investment securities and the estimated fair value by length of time the securities have been in an unrealized loss position:

	September 30, 2017
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	1	$	175	$	9	$	132	$	10	$	307
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	3		576		1		331		4		907
Agency guaranteed mortgage-backed securities	74		6,266		12		677		86		6,943
Small Business Administration loan-backed securities	1		149		8		749		9		898
Municipal securities	3		321		2		122		5		443
Other	—		—		—		—		—		—
Available-for-sale total	81		7,312		23		1,879		104		9,191
Total	$	82	$	7,487	$	32	$	2,011	$	114	$	9,498

	December 31, 2016
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value
Held-to-maturity
Municipal securities	$	15	$	467	$	8	$	61	$	23	$	528
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	9		950		—		127		9		1,077
Agency guaranteed mortgage-backed securities	102		6,649		7		326		109		6,975
Small Business Administration loan-backed securities	3		527		16		841		19		1,368
Municipal securities	28		992		—		9		28		1,001
Other	—		—		2		14		2		14
Available-for-sale total	142		9,118		25		1,317		167		10,435
Total	$	157	$	9,585	$	33	$	1,378	$	190	$	10,963

At September 30, 2017 and December 31, 2016, respectively, 360 and 642 HTM and 1,446 and 2,398 AFS investment securities were in an unrealized loss position.

Other-Than-Temporary Impairment

Ongoing Policy

We review investment securities on a quarterly basis for the presence of other-than-temporary impairment (“OTTI”). Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At September 30, 2017, we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is not more likely than not we would be required to sell such securities before recovery of their amortized cost basis. Therefore, these securities did not have any OTTI recognized during the third quarter of 2017. For additional information on our policy and evaluation process relating to OTTI, see Note 5 of our 2016 Annual Report on Form 10-K.

The following summarizes gains and losses, including OTTI, of which there was none, that were recognized in the statement of income:

	Three Months Ended								Nine Months Ended
	September 30, 2017				September 30, 2016				September 30, 2017				September 30, 2016
(In millions)	Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross  losses
Investment securities:
Other noninterest-bearing investments	$	5	$	—	$	8	$	—	$	20	$	7	$	15	$	4
Net gains 1			$	5			$	8			$	13			$	11

¹ Net gains were recognized in securities gains, net in the statement of income.

Interest income by security type is as follows:

(In millions)	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	7	$	10	$	17
Available-for-sale	72		6		78		209		18		227
Trading	1		—		1		2		—		2
Total	$	75	$	9	$	84	$	218	$	28	$	246

(In millions)	Three Months Ended September 30, 2016						Nine Months Ended September 30, 2016
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	7	$	9	$	16
Available-for-sale	40		3		43		118		8		126
Trading	1		—		1		1		—		1
Total	$	43	$	6	$	49	$	126	$	17	$	143

Investment securities with a carrying value of $2.3 billion at September 30, 2017 and $1.4 billion at December 31, 2016 were pledged to secure public and trust deposits, advances, and for other purposes as required by law. Securities are also pledged as collateral for security repurchase agreements.

Private Equity Investments

Effect of Volcker Rule

The Company’s PEIs are subject to the provisions of the Dodd-Frank Act. The Volcker Rule of the Dodd-Frank Act prohibits banks and bank holding companies from holding PEIs, except for SBIC funds and certain other permitted exclusions, beyond a required deadline. The Federal Reserve Board announced in December 2016 that it would allow banks to apply for an additional five-year extension beyond the July 21, 2017 deadline to comply with the Dodd-Frank Act requirement for these investments. The Company applied for and was granted an extension for its eligible PEIs. All positions in the remaining portfolio of PEIs are subject to the extended deadline or other applicable exclusions.

Of the recorded PEIs of $138 million at September 30, 2017, approximately $4 million remain prohibited by the Volcker Rule. At September 30, 2017, we have $27 million of unfunded commitments for PEIs, of which approximately $4 million relate to prohibited PEIs. We currently do not believe that this divestiture requirement will ultimately have a material impact on our financial statements. See other discussions related to private equity investments in Note 3.

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Loans And Allowance For Credit Losses

9 Months Ended

Sep. 30, 2017

Loans And Allowance For Credit Losses [Abstract]

Loans And Allowance For Credit Losses

LOANS AND ALLOWANCE FOR CREDIT LOSSES

Loans and Loans Held for Sale

Loans are summarized as follows according to major portfolio segment and specific loan class:

(In millions)	September 30, 2017		December 31, 2016
Loans held for sale	$	71	$	172
Commercial:
Commercial and industrial	$	14,041	$	13,452
Leasing	343		423
Owner-occupied	7,082		6,962
Municipal	1,073		778
Total commercial	22,539		21,615
Commercial real estate:
Construction and land development	2,170		2,019
Term	8,944		9,322
Total commercial real estate	11,114		11,341
Consumer:
Home equity credit line	2,745		2,645
1-4 family residential	6,522		5,891
Construction and other consumer real estate	558		486
Bankcard and other revolving plans	490		481
Other	188		190
Total consumer	10,503		9,693
Total loans	$	44,156	$	42,649

Loan balances are presented net of unearned income and fees, which amounted to $63 million at September 30, 2017 and $77 million at December 31, 2016.

Owner-occupied and commercial real estate loans include unamortized premiums of approximately $17 million at September 30, 2017 and $20 million at December 31, 2016.

Municipal loans generally include loans to municipalities with the debt service being repaid from general funds or pledged revenues of the municipal entity, or to private commercial entities or 501(c)(3) not-for-profit entities utilizing a pass-through municipal entity to achieve favorable tax treatment.

Land development loans included in the construction and land development loan class were $238 million at September 30, 2017 and $290 million at December 31, 2016.

Loans with a carrying value of approximately $25.4 billion at September 30, 2017 and $24.0 billion at December 31, 2016 have been pledged at the Federal Reserve and the FHLB of Des Moines as collateral for current and potential borrowings.

We sold loans totaling $146 million and $696 million for the three and nine months endedSeptember 30, 2017, and $413 million and $1.0 billion for the three and nine months endedSeptember 30, 2016, respectively, that were classified as loans held for sale. The sold loans were derecognized from the balance sheet. Loans classified as loans held for sale primarily consist of conforming residential mortgages and the guaranteed portion of SBA loans. The loans are mainly sold to U.S. government agencies or participated to third parties. At times, we have continuing involvement in the transferred loans in the form of servicing rights or a guarantee from the respective issuer. Amounts added to loans held for sale during these same periods were $176 million and $640 million for the three and nine months endedSeptember 30, 2017, and $387 million and $979 million for the three and nine months endedSeptember 30, 2016, respectively.

The principal balance of sold loans for which we retain servicing was approximately $2.1 billion at September 30, 2017, and $2.0 billion at December 31, 2016. Income from loans sold, excluding servicing, was $1 million and $9 million for the three and nine months endedSeptember 30, 2017, and $6 million and $15 million for the three and nine months endedSeptember 30, 2016, respectively.

Allowance for Credit Losses

The ACL consists of the allowance for loan and lease losses (“ALLL”) and the reserve for unfunded lending commitments (“RULC”). The ALLL represents our estimate of probable and estimable losses inherent in the loan and lease portfolio as of the balance sheet date. We also estimate a reserve for potential losses associated with off-balance sheet commitments, including standby letters of credit. We determine the RULC using the same procedures and methodologies that we use for the ALLL.

For additional information regarding our policies and methodologies used to estimate the ACL, see Note 6 of our 2016 Annual Report on Form 10-K.

Changes in the allowance for credit losses are summarized as follows:
	Three Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	393		$	116		$	35		$	544
Additions:
Provision for loan losses	(4		)	(7		)	16			5
Deductions:
Gross loan and lease charge-offs	(16		)	(4		)	(5		)	(25		)
Recoveries	12			2			3			17
Net loan and lease charge-offs	(4		)	(2		)	(2		)	(8		)
Balance at end of period	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	53		$	10		$	—		$	63
Provision charged to earnings	(4		)	—			—			(4		)
Balance at end of period	$	49		$	10		$	—		$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments	49			10			—			59
Total allowance for credit losses	$	434		$	117		$	49		$	600

	Nine Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	420		$	116		$	31		$	567
Additions:
Provision for loan losses	27			(15		)	23			35
Deductions:
Gross loan and lease charge-offs	(98		)	(6		)	(13		)	(117		)
Recoveries	36			12			8			56
Net loan and lease (charge-offs) recoveries	(62		)	6			(5		)	(61		)
Balance at end of period	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—		$	65
Provision credited to earnings	(5		)	(1		)	—			(6		)
Balance at end of period	$	49		$	10		$	—		$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments	49			10			—			59
Total allowance for credit losses	$	434		$	117		$	49		$	600

	Three Months Ended September 30, 2016
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	457		$	121		$	30		$	608
Additions:
Provision for loan losses	22			(6		)	3			19
Deductions:
Gross loan and lease charge-offs	(48		)	(1		)	(5		)	(54		)
Recoveries	15			7			2			24
Net loan and lease (charge-offs) recoveries	(33		)	6			(3		)	(30		)
Balance at end of period	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—		$	65
Provision credited to earnings	(2		)	(1		)	—			(3		)
Balance at end of period	$	52		$	10		$	—		$	62
Total allowance for credit losses at end of period
Allowance for loan losses	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments	52			10			—			62
Total allowance for credit losses	$	498		$	131		$	30		$	659

	Nine Months Ended September 30, 2016
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	454		$	114		$	38		$	606
Additions:
Provision for loan losses	93			5			(3		)	95
Deductions:
Gross loan and lease charge-offs	(137		)	(10		)	(12		)	(159		)
Recoveries	36			12			7			55
Net loan and lease (charge-offs) recoveries	(101		)	2			(5		)	(104		)
Balance at end of period	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments
Balance at beginning of period	$	58		$	16		$	1		$	75
Provision credited to earnings	(6		)	(6		)	(1		)	(13		)
Balance at end of period	$	52		$	10		$	—		$	62
Total allowance for credit losses at end of period
Allowance for loan losses	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments	52			10			—			62
Total allowance for credit losses	$	498		$	131		$	30		$	659

The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows:
	September 30, 2017
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	28	$	1	$	4	$	33
Collectively evaluated for impairment	357		106		45		508
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	385	$	107	$	49	$	541
Outstanding loan balances:
Individually evaluated for impairment	$	352	$	78	$	70	$	500
Collectively evaluated for impairment	22,163		11,026		10,427		43,616
Purchased loans with evidence of credit deterioration	24		10		6		40
Total	$	22,539	$	11,114	$	10,503	$	44,156

	December 31, 2016
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	56	$	3	$	6	$	65
Collectively evaluated for impairment	364		113		25		502
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	420	$	116	$	31	$	567
Outstanding loan balances:
Individually evaluated for impairment	$	466	$	78	$	75	$	619
Collectively evaluated for impairment	21,111		11,231		9,611		41,953
Purchased loans with evidence of credit deterioration	38		32		7		77
Total	$	21,615	$	11,341	$	9,693	$	42,649

Nonaccrual and Past Due Loans

Loans are generally placed on nonaccrual status when payment in full of principal and interest is not expected, or the loan is 90 days or more past due as to principal or interest, unless the loan is both well secured and in the process of collection. For further discussion of our policies and processes regarding nonaccrual and past due loans, see Note 6 of our 2016 Annual Report on Form 10-K.

Nonaccrual loans are summarized as follows:
(In millions)	September 30, 2017		December 31, 2016
Loans held for sale	$	13	$	40
Commercial:
Commercial and industrial	$	257	$	354
Leasing	8		14
Owner-occupied	85		74
Municipal	1		1
Total commercial	351		443
Commercial real estate:
Construction and land development	6		7
Term	41		29
Total commercial real estate	47		36
Consumer:
Home equity credit line	11		11
1-4 family residential	40		36
Construction and other consumer real estate	1		2
Bankcard and other revolving plans	1		1
Other	1		—
Total consumer loans	54		50
Total	$	452	$	529

Past due loans (accruing and nonaccruing) are summarized as follows:
	September 30, 2017
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	58	$	—	$	13	$	13	$	71	$	—	$	—
Commercial:
Commercial and industrial	$	13,870	$	53	$	118	$	171	$	14,041	$	17	$	150
Leasing	343		—		—		—		343		—		8
Owner-occupied	7,021		27		34		61		7,082		5		49
Municipal	1,073		—		—		—		1,073		—		1
Total commercial	22,307		80		152		232		22,539		22		208
Commercial real estate:
Construction and land development	2,158		6		6		12		2,170		1		1
Term	8,925		8		11		19		8,944		2		30
Total commercial real estate	11,083		14		17		31		11,114		3		31
Consumer:
Home equity credit line	2,735		6		4		10		2,745		—		4
1-4 family residential	6,497		10		15		25		6,522		—		20
Construction and other consumer real estate	547		6		5		11		558		4		—
Bankcard and other revolving plans	486		3		1		4		490		1		1
Other	185		3		—		3		188		—		1
Total consumer loans	10,450		28		25		53		10,503		5		26
Total	$	43,840	$	122	$	194	$	316	$	44,156	$	30	$	265

	December 31, 2016
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	172	$	—	$	—	$	—	$	172	$	—	$	40
Commercial:
Commercial and industrial	$	13,306	$	72	$	74	$	146	$	13,452	$	10	$	287
Leasing	423		—		—		—		423		—		14
Owner-occupied	6,894		40		28		68		6,962		8		43
Municipal	778		—		—		—		778		—		1
Total commercial	21,401		112		102		214		21,615		18		345
Commercial real estate:
Construction and land development	2,010		7		2		9		2,019		1		1
Term	9,291		9		22		31		9,322		12		18
Total commercial real estate	11,301		16		24		40		11,341		13		19
Consumer:
Home equity credit line	2,635		4		6		10		2,645		1		5
1-4 family residential	5,857		12		22		34		5,891		—		11
Construction and other consumer real estate	479		3		4		7		486		3		—
Bankcard and other revolving plans	478		2		1		3		481		1		1
Other	189		1		—		1		190		—		—
Total consumer loans	9,638		22		33		55		9,693		5		17
Total	$	42,340	$	150	$	159	$	309	$	42,649	$	36	$	381

¹  Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Credit Quality Indicators

In addition to the past due and nonaccrual criteria, we also analyze loans using loan risk-grading systems, which vary based on the size and type of credit risk exposure. The internal risk grades assigned to loans follow our definitions of Pass, Special Mention, Substandard, and Doubtful, which are consistent with published definitions of regulatory risk classifications. For further discussion of our policies and processes regarding credit quality indicators and internal loan risk grading, see Note 6 of our 2016 Annual Report on Form 10-K.

Outstanding loan balances (accruing and nonaccruing) categorized by these credit quality classifications are summarized as follows:

	September 30, 2017
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	12,987	$	357	$	695	$	2	$	14,041
Leasing	325		1		17		—		343
Owner-occupied	6,697		93		292		—		7,082
Municipal	1,072		—		1		—		1,073
Total commercial	21,081		451		1,005		2		22,539		$	385
Commercial real estate:
Construction and land development	2,140		24		6		—		2,170
Term	8,697		84		163		—		8,944
Total commercial real estate	10,837		108		169		—		11,114		107
Consumer:
Home equity credit line	2,728		—		17		—		2,745
1-4 family residential	6,475		—		47		—		6,522
Construction and other consumer real estate	554		—		4		—		558
Bankcard and other revolving plans	487		—		3		—		490
Other	187		—		1		—		188
Total consumer loans	10,431		—		72		—		10,503		49
Total	$	42,349	$	559	$	1,246	$	2	$	44,156	$	541

	December 31, 2016
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	12,185	$	266	$	998	$	3	$	13,452
Leasing	387		5		30		1		423
Owner-occupied	6,560		96		306		—		6,962
Municipal	765		7		6		—		778
Total commercial	19,897		374		1,340		4		21,615		$	420
Commercial real estate:
Construction and land development	1,942		52		25		—		2,019
Term	9,096		82		144		—		9,322
Total commercial real estate	11,038		134		169		—		11,341		116
Consumer:
Home equity credit line	2,629		—		16		—		2,645
1-4 family residential	5,851		—		40		—		5,891
Construction and other consumer real estate	482		—		4		—		486
Bankcard and other revolving plans	478		—		3		—		481
Other	189		—		1		—		190
Total consumer loans	9,629		—		64		—		9,693		31
Total	$	40,564	$	508	$	1,573	$	4	$	42,649	$	567

Impaired Loans

Loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due in accordance with the contractual terms of the loan agreement, including scheduled interest payments. Payments received on impaired loans that are accruing are recognized in interest income, according to the contractual loan agreement. Payments received on impaired loans that are on nonaccrual are not recognized in interest income, but are applied as a reduction to the principal outstanding. The amount of interest income recognized on a cash basis during the time the loans were impaired within the three and six months ended September 30, 2017 and 2016 was not significant. For additional information regarding our policies and methodologies used to evaluate impaired loans, see Note 6 of our 2016 Annual Report on Form 10-K.

Information on impaired loans individually evaluated is summarized as follows, including the average recorded investment and interest income recognized for the three months endedSeptember 30, 2017 and 2016:

	September 30, 2017
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	313	$	109	$	160	$	269	$	25
Owner-occupied	117		64		39		103		3
Municipal	1		1		—		1		—
Total commercial	431		174		199		373		28
Commercial real estate:
Construction and land development	10		5		4		9		—
Term	67		45		12		57		—
Total commercial real estate	77		50		16		66		—
Consumer:
Home equity credit line	24		13		8		21		—
1-4 family residential	61		26		25		51		4
Construction and other consumer real estate	3		2		1		3		—
Other	1		1		—		1		—
Total consumer loans	89		42		34		76		4
Total	$	597	$	266	$	249	$	515	$	32

	December 31, 2016
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	470	$	82	$	311	$	393	$	52
Owner-occupied	115		71		30		101		3
Municipal	1		1		—		1		—
Total commercial	586		154		341		495		55
Commercial real estate:
Construction and land development	22		7		6		13		—
Term	92		53		17		70		2
Total commercial real estate	114		60		23		83		2
Consumer:
Home equity credit line	24		16		7		23		—
1-4 family residential	59		27		28		55		6
Construction and other consumer real estate	3		1		2		3		—
Other	2		1		—		1		—
Total consumer loans	88		45		37		82		6
Total	$	788	$	259	$	401	$	660	$	63

	Three Months Ended September 30, 2017				Nine Months Ended September 30, 2017
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	356	$	1	$	311	$	5
Owner-occupied	104		2		101		5
Municipal	1		—		1		—
Total commercial	461		3		413		10
Commercial real estate:
Construction and land development	10		—		11		—
Term	53		1		58		11
Total commercial real estate	63		1		69		11
Consumer:
Home equity credit line	21		—		21		1
1-4 family residential	53		1		53		1
Construction and other consumer real estate	2		—		2		—
Other	1		—		1		—
Total consumer loans	77		1		77		2
Total	$	601	$	5	$	559	$	23

	Three Months Ended September 30, 2016				Nine Months Ended September 30, 2016
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	449	$	1	$	319	$	4
Owner-occupied	100		2		103		8
Municipal	1		—		1		—
Total commercial	550		3		423		12
Commercial real estate:
Construction and land development	11		1		12		2
Term	74		3		79		9
Total commercial real estate	85		4		91		11
Consumer:
Home equity credit line	23		—		22		1
1-4 family residential	61		1		58		2
Construction and other consumer real estate	3		—		3		—
Other	2		—		2		—
Total consumer loans	89		1		85		3
Total	$	724	$	8	$	599	$	26

Modified and Restructured Loans

Loans may be modified in the normal course of business for competitive reasons or to strengthen the Company’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Company has granted a concession that it would not otherwise consider, are considered troubled debt restructurings (“TDRs”). For further discussion of our policies and processes regarding TDRs, see Note 6 of our 2016 Annual Report on Form 10-K.

Selected information on TDRs that includes the recorded investment on an accruing and nonaccruing basis by loan class and modification type is summarized in the following schedules:

	September 30, 2017
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	4	$	—	$	—	$	11	$	23	$	38
Owner-occupied	2		—		1		—		7		13		23
Total commercial	2		4		1		—		18		36		61
Commercial real estate:
Construction and land development	—		2		—		—		—		2		4
Term	4		—		—		1		2		7		14
Total commercial real estate	4		2		—		1		2		9		18
Consumer:
Home equity credit line	—		2		10		—		—		3		15
1-4 family residential	1		—		7		1		2		26		37
Construction and other consumer real estate	—		1		—		—		—		1		2
Total consumer loans	1		3		17		1		2		30		54
Total accruing	7		9		18		2		22		75		133
Nonaccruing
Commercial:
Commercial and industrial	—		1		4		4		46		27		82
Owner-occupied	1		2		—		1		1		9		14
Municipal	—		1		—		—		—		—		1
Total commercial	1		4		4		5		47		36		97
Commercial real estate:
Construction and land development	—		—		—		—		—		—		—
Term	2		1		—		—		1		4		8
Total commercial real estate	2		1		—		—		1		4		8
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		2		—		1		5		8
Construction and other consumer real estate	—		—		—		1		—		—		1
Total consumer loans	—		—		3		1		1		5		10
Total nonaccruing	3		5		7		6		49		45		115
Total	$	10	$	14	$	25	$	8	$	71	$	120	$	248

¹ Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

	December 31, 2016
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	19	$	—	$	—	$	—	$	28	$	47
Owner-occupied	3		—		1		—		8		10		22
Total commercial	3		19		1		—		8		38		69
Commercial real estate:
Construction and land development	—		4		—		—		—		4		8
Term	4		—		—		1		2		10		17
Total commercial real estate	4		4		—		1		2		14		25
Consumer:
Home equity credit line	—		1		10		—		—		3		14
1-4 family residential	3		1		6		—		2		30		42
Construction and other consumer real estate	—		—		—		—		—		1		1
Total consumer loans	3		2		16		—		2		34		57
Total accruing	10		25		17		1		12		86		151
Nonaccruing
Commercial:
Commercial and industrial	1		—		—		1		33		25		60
Owner-occupied	—		1		—		3		1		12		17
Municipal	—		1		—		—		—		—		1
Total commercial	1		2		—		4		34		37		78
Commercial real estate:
Construction and land development	—		—		—		—		2		—		2
Term	2		1		—		—		2		3		8
Total commercial real estate	2		1		—		—		4		3		10
Consumer:
Home equity credit line	—		—		1		—		—		1		2
1-4 family residential	—		—		2		—		1		5		8
Construction and other consumer real estate	—		—		—		2		—		—		2
Total consumer loans	—		—		3		2		1		6		12
Total nonaccruing	3		3		3		6		39		46		100
Total	$	13	$	28	$	20	$	7	$	51	$	132	$	251

¹  Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

Unfunded lending commitments on TDRs amounted to approximately $18 million at September 30, 2017 and $14 million at December 31, 2016.

The total recorded investment of all TDRs in which interest rates were modified below market was $116 million at September 30, 2017 and $128 million at December 31, 2016. These loans are included in the previous schedule in the columns for interest rate below market and multiple modification types.

The net financial impact on interest income due to interest rate modifications below market for accruing TDRs for the three and nine months endedSeptember 30, 2017 and 2016 was not significant.

On an ongoing basis, we monitor the performance of all TDRs according to their restructured terms. Subsequent payment default is defined in terms of delinquency, when principal or interest payments are past due 90 days or more for commercial loans, or 60 days or more for consumer loans.

The recorded investment of accruing and nonaccruing TDRs that had a payment default during the period listed below (and are still in default at period end) and are within 12 months or less of being modified as TDRs is as follows:

	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing			Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	1	1,291	$	1
Owner-occupied	—		—		—		—		1		5,405	1
Total commercial	—		1		1		—		2			2
Total	$	—	$	1	$	1	$	—	$	2		$	2

	Three Months Ended September 30, 2016						Nine Months Ended September 30, 2016
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	3	$	3	$	—	$	3	$	3
Owner-occupied	4		—		4		4		—		4
Total commercial	4		3		7		4		3		7
Total	$	4	$	3	$	7	$	4	$	3	$	7

Note: Total loans modified as TDRs during the 12 months previous to September 30, 2017 and 2016 were $84 millionand $139 million, respectively.

At September 30, 2017 and December 31, 2016, the amount of foreclosed residential real estate property held by the Company was approximately $1 million and $2 million, and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure was approximately $7 million and $10 million, respectively.

Concentrations of Credit Risk

Credit risk is the possibility of loss from the failure of a borrower, guarantor, or another obligor to fully perform under the terms of a credit-related contract. We perform an ongoing analysis of our loan portfolio to evaluate whether there is any significant exposure to any concentrations of credit risk. See Note 6 of our 2016 Annual Report on Form 10-K for further discussion of our evaluation of credit risk concentrations. See also Note 7 of our 2016 Annual Report on Form 10-K for a discussion of counterparty risk associated with the Company’s derivative transactions.

Purchased Loans

Background and Accounting

We purchase loans in the ordinary course of business and account for them and the related interest income based on their performing status at the time of acquisition. Purchased credit-impaired (“PCI”) loans have evidence of credit deterioration at the time of acquisition and it is probable that not all contractual payments will be collected. Interest income for PCI loans is accounted for on an expected cash flow basis. Upon acquisition, in accordance with applicable accounting guidance, the acquired loans were recorded at their fair value without a corresponding ALLL. Certain acquired loans with similar characteristics such as risk exposure, type, size, etc., are grouped and accounted for in loan pools.

Outstanding Balances and Accretable Yield

The outstanding balances of all required payments and the related carrying amounts for PCI loans are as follows:

(In millions)	September 30, 2017		December 31, 2016
Commercial	$	36	$	49
Commercial real estate	15		51
Consumer	7		9
Outstanding balance	$	58	$	109
Carrying amount	$	40	$	77
Less ALLL	—		1
Carrying amount, net	$	40	$	76

At the time of acquisition of PCI loans, we determine the loan’s contractually required payments in excess of all cash flows expected to be collected as an amount that should not be accreted (nonaccretable difference). With respect to the cash flows expected to be collected, the portion representing the excess of the loan’s expected cash flows over our initial investment (accretable yield) is accreted into interest income on a level yield basis over the remaining expected life of the loan or pool of loans. The effects of estimated prepayments are considered in estimating the expected cash flows.

Certain PCI loans are not accounted for as previously described because the estimation of cash flows to be collected involves a high degree of uncertainty. Under these circumstances, the accounting guidance provides that interest income is recognized on a cash basis similar to the cost recovery methodology for nonaccrual loans. The net carrying amounts in the preceding schedule also include the amounts for these loans. There were no loans of this type at September 30, 2017 and December 31, 2016.

Changes in the accretable yield for PCI loans were as follows:

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Balance at beginning of period	$	21		$	38		$	33		$	40
Accretion	(2		)	(6		)	(17		)	(19		)
Reclassification from nonaccretable difference	—			—			(1		)	9
Disposals and other	—			2			4			4
Balance at end of period	$	19		$	34		$	19		$	34

Note: Amounts have been adjusted based on refinements to the original estimates of the accretable yield.

The primary drivers of reclassification to accretable yield from nonaccretable difference and increases in disposals and other resulted primarily from (1) changes in estimated cash flows, (2) unexpected payments on nonaccrual loans, and (3) recoveries on zero balance loans pools. See subsequent discussion under changes in cash flow estimates.

ALLL Determination

For all acquired loans, the ALLL is only established for credit deterioration subsequent to the date of acquisition and represents our estimate of the inherent losses in excess of the book value of acquired loans. The ALLL for acquired loans is included in the overall ALLL in the balance sheet.

During the three and nine months endedSeptember 30, we adjusted the ALLL for acquired loans by recording a provision for loan losses of an insignificant amount for both periods in 2017, and $1 million and $2 million in 2016, respectively. The provision is net of the ALLL reversals resulting from changes in cash flow estimates, which are discussed subsequently.

Changes in the provision for loan losses and related ALLL are driven in large part by the same factors that affect the changes in reclassification from nonaccretable difference to accretable yield, as discussed under changes in cash flow estimates.

Changes in Cash Flow Estimates

Over the life of the loan or loan pool, we continue to estimate cash flows expected to be collected. We evaluate quarterly at the balance sheet date whether the estimated present values of these loans using the effective interest rates have decreased below their carrying values. If so, we record a provision for loan losses.

For increases in carrying values that resulted from better-than-expected cash flows, we use such increases first to reverse any existing ALLL. During the three and nine months endedSeptember 30, total reversals to the ALLL, including the impact of increases in estimated cash flows, were insignificant during both periods in 2017 and $1 million during both periods in 2016, respectively. When there is no current ALLL, we increase the amount of accretable yield on a prospective basis over the remaining life of the loan and recognize this increase in interest income.

For the three and nine months endedSeptember 30, the impact of increased cash flow estimates recognized in the statement of income for acquired loans with no ALLL was approximately $2 million and $15 million in 2017, and $4 million and $14 million in 2016, respectively, of additional interest income.

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Derivative Instruments And Hedging Activities

9 Months Ended

Sep. 30, 2017

Summary of Derivative Instruments [Abstract]

Derivative Instruments And Hedging Activities

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Objectives and Accounting

Our objectives in using derivatives are to add stability to interest income or expense, to modify the duration of specific assets or liabilities as we consider advisable, to manage exposure to interest rate movements or other identified risks, and/or to directly offset derivatives sold to our customers. For a detailed discussion of the use of and accounting policies regarding derivative instruments, see Note 7 of our 2016 Annual Report on Form 10-K

Collateral and Credit Risk

Exposure to credit risk arises from the possibility of nonperformance by counterparties. No significant losses on derivative instruments have occurred as a result of counterparty nonperformance. For a more detailed discussion of collateral and credit risk related to our derivative contracts see Note 7 of our 2016 Annual Report on Form 10-K.

Our derivative contracts require us to pledge collateral for derivatives that are in a net liability position at a given balance sheet date. Certain of these derivative contracts contain credit-risk-related contingent features that include the requirement to maintain a minimum debt credit rating. We may be required to pledge additional collateral if a credit-risk-related feature were triggered, such as a downgrade of our credit rating. However, in past situations, not all counterparties have demanded that additional collateral be pledged when provided for under their contracts. At September 30, 2017, the fair value of our derivative liabilities was $35 million, for which we were required to pledge cash collateral of approximately $46 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s or Moody’s at September 30, 2017, the additional amount of collateral we could be required to pledge is approximately $1 million. As a result of the Dodd-Frank Act, all newly eligible derivatives entered into are cleared through a central clearinghouse. Derivatives that are centrally cleared do not have credit-risk-related features that require additional collateral if our credit rating were downgraded.

Derivative Amounts

Selected information with respect to notional amounts and recorded gross fair values at September 30, 2017 and December 31, 2016, and the related gain (loss) of derivative instruments for the three and nine months endedSeptember 30, 2017 and 2016 is summarized as follows:

	September 30, 2017						December 31, 2016
	Notional amount		Fair value				Notional amount		Fair value
(In millions)			Other assets		Other liabilities				Other assets		Other liabilities
Derivatives designated as hedging instruments:
Cash flow hedges:
Interest rate swaps	$	1,138	$	—	$	—	$	1,388	$	2	$	1
Derivatives not designated as hedging instruments:
Interest rate swaps and forwards	205		1		—		235		2		—
Interest rate swaps for customers 1	4,598		36		30		4,162		49		49
Foreign exchange	280		6		5		424		11		9
Total derivatives not designated as hedging instruments	5,083		43		35		4,821		62		58
Total derivatives	$	6,221	$	43	$	35	$	6,209	$	64	$	59

¹ Notional amounts include both the customer swaps and the offsetting derivative contracts.

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2017								Nine Months Ended September 30, 2017
(In millions)	OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)			Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	—	$	—					$	—	$	3
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts					$	—							$	(1	)
Interest rate swaps for customers					4								8
Foreign exchange					4								12
Total derivatives	$	—	$	—	$	8	$	—	$	—	$	3	$	19		$	—

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2016									Nine Months Ended September 30, 2016
(In millions)	OCI			Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	(5	)	$	3					$	23	$	9
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts						$	1							$	3
Interest rate swaps for customers						4								5
Foreign exchange						3								8
Total derivatives	$	(5	)	$	3	$	8	$	—	$	23	$	9	$	16	$	—

Note: These schedules are not intended to present at any given time the Company’s long/short position with respect to its derivative contracts.

¹  Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2017, we estimate that $2 million will be reclassified from AOCI into interest income.

The fair value of derivative assets was reduced by a net credit valuation adjustment of $4 million and $7 million at September 30, 2017 and 2016, respectively. The adjustment for derivative liabilities was a $1 million decrease and was not significant at September 30, 2017 and 2016, respectively. These adjustments are required to reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk.

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Debt And Shareholders' Equity

9 Months Ended

Sep. 30, 2017

Capitalization, Long-term Debt and Equity [Abstract]

Debt And Shareholders' Equity

DEBT AND SHAREHOLDERS’ EQUITY

Long-term debt is summarized as follows:

(In millions)	September 30, 2017		December 31, 2016
Subordinated notes	$	247	$	247
Senior notes	135		287
Capital lease obligations	1		1
Total	$	383	$	535

The preceding carrying values represent the par value of the debt adjusted for any unamortized premium or discount or unamortized debt issuance costs.

Debt Redemptions and Maturities

During the first quarter of 2017, $153 million of our 4.5% senior notes matured.

During the first nine months of 2016, $89 million of our 4.0% senior notes matured. In addition, we purchased $15 million of our 4.5% senior notes and redeemed $11 million of our 3.6% senior medium-term notes.

During the third quarter of 2016 we elected to exercise our right to redeem the following junior subordinated debentures related to trust preferred securities issued to the following trusts.

(Dollar amounts in millions)	Balance Redeemed		Coupon rate 1	Redemption date
Amegy Statutory Trust I	$	51	3mL+2.85%	September 17, 2016
Amegy Statutory Trust III	62		3mL+1.78%	September 15, 2016
Stockmen’s Statutory Trust II	8		3mL+3.15%	September 26, 2016
Stockmen’s Statutory Trust III	8		3mL+2.89%	September 17, 2016
Total	$	129

¹  Designation of “3mL” is three-month London Interbank Offered Rate (“LIBOR”).

Shareholders’ Equity

During the third quarter of 2017, the Company continued its common stock buyback program and repurchased 2.5 million shares of common stock outstanding with a fair value of $115 million at an average price of $45.45 per share, and has repurchased 4.7 million shares of common stock outstanding with a fair value $205 million at an average price of $43.72 per share during the first nine months of 2017. During the first nine months of 2016, the Company repurchased 1.5 million shares of common stock outstanding with a fair value of $45 million, at an average price of $30.64 per share.

During the second quarter of 2017, we redeemed all outstanding shares of our 7.9% Series F preferred stock for a cash payment of approximately $144 million. Dividends paid to these redeemed shares amounted to $0.49375 per depositary share for a total amount of $3 million. The total one-time reduction to net earnings applicable to common shareholders associated with the preferred stock redemption was $2 million due to the accelerated recognition of preferred stock issuance costs.

On April 25, 2016, we launched a tender offer to purchase up to $120 million par amount of certain outstanding preferred stock. Our preferred stock decreased by $119 million in the second quarter of 2016 as a result of the tender offer, including the purchase of $27 million of our Series I preferred stock, $59 million of our Series J preferred stock, and $33 million of our Series G preferred stock for an aggregate cash payment of $126 million. The total one-time reduction to net earnings applicable to common shareholders associated with the preferred stock redemption was $10 million.

Accumulated Other Comprehensive Income

Accumulated other comprehensive income (loss) was $(57) million at September 30, 2017 compared to $(122) million at December 31, 2016. Changes in AOCI by component are as follows:

(In millions)	Net unrealized gains (losses) on investment securities			Net unrealized gains (losses) on derivatives and other			Pension and post-retirement			Total
Nine Months Ended September 30, 2017
Balance at December 31, 2016	$	(93	)	$	2		$	(31	)	$	(122	)
OCI before reclassifications, net of tax	65			2			—			67
Amounts reclassified from AOCI, net of tax	—			(2		)	—			(2		)
OCI	65			—			—			65
Balance at September 30, 2017	$	(28	)	$	2		$	(31	)	$	(57	)
Income tax expense included in OCI	$	40		$	—		$	—		$	40
Nine Months Ended September 30, 2016
Balance at December 31, 2015	$	(18	)	$	2		$	(38	)	$	(54	)
OCI (loss) before reclassifications, net of tax	54			16			(1		)	69
Amounts reclassified from AOCI, net of tax	—			(5		)	—			(5		)
OCI (loss)	54			11			(1		)	64
Balance at September 30, 2016	$	36		$	13		$	(39	)	$	10
Income tax expense included in OCI (loss)	$	34		$	6		$	1		$	41

	Amounts reclassified from AOCI 1				Amounts reclassified from AOCI 1				Statement of income (SI) Balance sheet (BS)
(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
Details about AOCI components	2017		2016		2017		2016			Affected line item
Net unrealized gains on derivative instruments	$	—	$	3	$	3	$	9	SI	Interest and fees on loans
Income tax expense	—		1		1		4
Amounts Reclassified from AOCI	$	—	$	2	$	2	$	5

¹  Positive reclassification amounts indicate increases to earnings in the statement of income and decreases to balance sheet assets.

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Commitments, Guarantees, And Contingent Liabilities

9 Months Ended

Sep. 30, 2017

Guarantees, Commitments And Contingencies [Abstract]

Guarantees, Commitments And Contingencies

COMMITMENTS, GUARANTEES AND CONTINGENT LIABILITIES

Commitments and Guarantees

Contractual amounts of off-balance sheet financial instruments used to meet the financing needs of our customers are as follows:

(In millions)	September 30, 2017		December 31, 2016
Net unfunded commitments to extend credit 1	$	18,828	$	18,274
Standby letters of credit:
Financial	709		771
Performance	202		196
Commercial letters of credit	43		60
Total unfunded lending commitments	$	19,782	$	19,301

¹  Net of participations

The Company’s 2016 Annual Report on Form 10-K contains further information about these commitments and guarantees including their terms and collateral requirements. At September 30, 2017, the Company had recorded approximately $5 million as a liability for the guarantees associated with the standby letters of credit, which consisted of $1 million attributable to the RULC and $4 million of deferred commitment fees.

At September 30, 2017, we had unfunded commitments for PEIs of approximately $27 million. These obligations have no stated maturity. PEIs related to these commitments that are prohibited by the Volcker Rule were $4 million at September 30, 2017. See related discussions about these investments in Notes 3 and 5.

Legal Matters

We are subject to litigation in court and arbitral proceedings, as well as proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies. Litigation may relate to lending, deposit and other customer relationships, vendor and contractual issues, employee matters, intellectual property matters, personal injuries and torts, regulatory and legal compliance, and other matters. While most matters relate to individual claims, we are also subject to putative class action claims and similar broader claims. Proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies may relate to our banking, investment advisory, trust, securities, and other products and services; our customers’ involvement in money laundering, fraud, securities violations and other illicit activities or our policies and practices relating to such customer activities; and our compliance with the broad range of banking, securities and other laws and regulations applicable to us. At any given time, we may be in the process of responding to subpoenas, requests for documents, data and testimony relating to such matters and engaging in discussions to resolve the matters.

As of September 30, 2017, we were subject to the following material litigation and governmental inquiries:

• a civil suit, Shou-En Wang v. CB&T, brought against us in the Superior Court for Los Angeles County, Central District in April 2016. The case relates to our depositor relationships with customers who were promoters of an investment program that allegedly misappropriated investors’ funds. This case is in an early phase, with initial motion practice having been completed.

• a civil suit, McFarland as Trustee for International Manufacturing Group v. CB&T, et. al., brought against us in the United States Bankruptcy Court for the Eastern District of California in May 2016. The Trustee seeks to recover loan payments previously repaid to us by our customer, International Manufacturing Group (“IMG”), alleging that IMG, along with its principal, obtained loans and made loan repayments in furtherance of an alleged Ponzi scheme. This case is in an early phase with initial motion practice having been completed.

• a civil suit, JTS Communities, Inc. et. al v. CB&T, Jun Enkoji and Dawn Satow, brought against us in the Superior Court of California, Sacramento County, California in June 2017. In this case four investors in IMG seek to hold us liable for losses arising from their investments in that company, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi Scheme.

• a civil class action lawsuit, Evans v. CB&T, brought against us in the Eastern District of California in May 2017. This case was filed on behalf of a class of up to 50 investors in IMG and seeks to hold us liable for losses of class members arising from their investments in IMG, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi Scheme.

At the end of September 2017, we settled a governmental inquiry conducted by the U.S. Attorney’s Office for the Eastern District of Pennsylvania into our payment processing practices relating to certain telemarketing customers alleged to have engaged in fraudulent marketing practices, primarily in the 2006-2008 timeframe. The settlement agreement imposed a civil money penalty of $3.6 million, which was paid in the third quarter. Because this amount had been fully reserved, the settlement did not affect our third quarter financial results.

At least quarterly, we review outstanding and new legal matters, utilizing then available information. In accordance with applicable accounting guidance, if we determine that a loss from a matter is probable and the amount of the loss can be reasonably estimated, we establish an accrual for the loss. In the absence of such a determination, no accrual is made. Once established, accruals are adjusted to reflect developments relating to the matters.

In our review, we also assess whether we can determine the range of reasonably possible losses for significant matters in which we are unable to determine that the likelihood of a loss is remote. Because of the difficulty of predicting the outcome of legal matters, discussed subsequently, we are able to meaningfully estimate such a range only for a limited number of matters. Based on information available as of September 30, 2017, we estimated that the aggregate range of reasonably possible losses for those matters to be from $0 millionto roughly $20 million in excess of amounts accrued. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from this estimate. Those matters for which a meaningful estimate is not possible are not included within this estimated range and, therefore, this estimated range does not represent our maximum loss exposure.

Based on our current knowledge, we believe that our current estimated liability for litigation and other legal actions and claims, reflected in our accruals and determined in accordance with applicable accounting guidance, is adequate and that liabilities in excess of the amounts currently accrued, if any, arising from litigation and other legal actions and claims for which an estimate as previously described is possible, will not have a material impact on our financial condition, results of operations, or cash flows. However, in light of the significant uncertainties involved in these matters, and the very large or indeterminate damages sought in some of these matters, an adverse outcome in one or more of these matters could be material to our financial condition, results of operations, or cash flows for any given reporting period.

Any estimate or determination relating to the future resolution of litigation, arbitration, governmental or self-regulatory examinations, investigations or actions or similar matters is inherently uncertain and involves significant judgment. This is particularly true in the early stages of a legal matter, when legal issues and facts have not been well articulated, reviewed, analyzed, and vetted through discovery, preparation for trial or hearings, substantive and productive mediation or settlement discussions, or other actions. It is also particularly true with respect to class action and similar claims involving multiple defendants, matters with complex procedural requirements or substantive issues or novel legal theories, and examinations, investigations and other actions conducted or brought by governmental and self-regulatory agencies, in which the normal adjudicative process is not applicable. Accordingly, we usually are unable to determine whether a favorable or unfavorable outcome is remote, reasonably likely, or probable, or to estimate the amount or range of a probable or reasonably likely loss, until relatively late in the course of a legal matter, sometimes not until a number of years have elapsed. Accordingly, our judgments and estimates relating to claims will change from time to time in light of developments and actual outcomes will differ from our estimates. These differences may be material.

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Retirement Plans

9 Months Ended

Sep. 30, 2017

Defined Benefit Plan [Abstract]

Retirement Plans

RETIREMENT PLANS

The following discloses the net periodic benefit cost (credit) and its components for the Company’s pension and other retirement plans:

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest cost	$	2		$	2		$	5		$	5
Expected return on plan assets	(3		)	(3		)	(9		)	(9		)
Partial settlement loss	1			3			2			3
Amortization of net actuarial loss	1			1			4			5
Net periodic benefit cost	$	1		$	3		$	2		$	4

As disclosed in our 2016 Annual Report on Form 10-K, the Company has frozen its participation and benefit accruals for the pension plan and its contributions for individual benefit payments in the postretirement benefit plan.

During the third quarter of 2017, the Company revised its pension plan to offer certain participants a temporary opportunity to make an election to receive an immediate distribution from the pension plan. The window for this opportunity is between August 1, 2017 and November 24, 2017.

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Income Taxes

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

The effective income tax rate of 34.2% for the third quarter of 2017 was slightly higher than the 2016third quarter rate of 33.9%. The effective tax rates for the first nine months of 2017 and 2016 were 30.6% and 33.3%, respectively. These tax rates for both 2017 and 2016 generally benefited from the non-taxability of certain income items. The 2017 effective tax rate was further impacted by the following factors:

• We re-evaluated our state tax positions in the first quarter of 2017, which resulted in a one-time $14 million benefit to income tax expense.

• We reduced income tax expense by $4 million in the second quarter of 2017 due to changes in the carrying value of various state deferred tax items.

• We also recorded an $8 million benefit in the first nine months of 2017 from the implementation of new accounting guidance related to stock-based compensation.

We had a net deferred tax asset (“DTA”) balance of $207 million at September 30, 2017, compared with $250 million at December 31, 2016, which included a $4 million valuation allowance at each respective reporting date for certain acquired net operating loss carryforwards included in our acquisition of the remaining interest in a less significant subsidiary. We evaluate deferred tax assets on a regular basis to determine whether an additional valuation allowance is required. Based on this evaluation, and considering the weight of the positive evidence compared to the negative evidence, we have concluded that an additional valuation allowance is not required as of September 30, 2017.

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Operating Segment Information

9 Months Ended

Sep. 30, 2017

Operating Segment Information [Abstract]

Operating Segment Information

. OPERATING SEGMENT INFORMATION

We manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process continues to be refined. Total average loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment. Prior period amounts have been reclassified to reflect these changes.

As of September 30, 2017, Zions Bank operates 98 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. Amegy operates 73 branches in Texas. CB&T operates 92 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates one branch in Washington and one branch in Oregon.

The operating segment identified as “Other” includes the Parent, Zions Management Services Company, certain nonbank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments. Throughout 2016 consolidation efforts continued, which resulted in transitioning full-time equivalents from the business segments to the Company’s back-office units. Due to the continuing nature and timing of this change, the Company’s back-office units retained more direct expenses in 2016 than in prior years. In the first quarter of 2017 we made changes to the FTP process and internal allocation of central expenses to better reflect the performance of business segments. Prior period amounts have been revised to reflect the impact of these changes had they been instituted in 2016.

The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Parent’s net interest income includes interest expense on other borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment.

The accounting policies of the individual operating segments are the same as those of the Company. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations.

The following schedule presents selected operating segment information for the three months ended September 30, 2017 and 2016:

(In millions)	Zions Bank						Amegy				CB&T						NBAZ					NSB
	2017			2016			2017		2016		2017			2016			2017			2016		2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	164		$	157		$	122	$	114	$	118		$	110		$	53		$	48	$	34		$	31
Provision for loan losses	(15		)	(1		)	33		24		(4		)	(2		)	(8		)	—		(3		)	(4		)
Net interest income after provision for loan losses	179			158			89		90		122			112			61			48		37			35
Noninterest income	39			39			28		32		20			18			10			11		11			10
Noninterest expense	107			108			86		75		74			75			38			36		35			34
Income (loss) before income taxes	$	111		$	89		$	31	$	47	$	68		$	55		$	33		$	23	$	13		$	11
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	12,543		$	12,629		$	11,170	$	10,666	$	9,575		$	9,341		$	4,267		$	4,156	$	2,347		$	2,288
Total deposits	15,773			15,948			10,862		11,068		11,021			10,929			4,816			4,632		4,276			4,223
(In millions)	Vectra						TCBW				Other						Consolidated Company
	2017			2016			2017		2016		2017			2016			2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	32		$	31		$	12	$	10	$	(13	)	$	(32	)	$	522		$	469
Provision for loan losses	—			2			3		—		(1		)	—			5			19
Net interest income after provision for loan losses	32			29			9		10		(12		)	(32		)	517			450
Noninterest income	7			6			1		1		23			28			139			145
Noninterest expense	25			25			5		5		43			45			413			403
Income (loss) before income taxes	$	14		$	10		$	5	$	6	$	(32	)	$	(49	)	$	243		$	192
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	2,683		$	2,489		$	939	$	796	$	308		$	122		$	43,832		$	42,487
Total deposits	2,757			2,663			1,098		1,010		1,318			202			51,921			50,675

The following schedule presents selected operating segment information for the nine months ended September 30, 2017 and 2016:

(In millions)	Zions Bank					Amegy				CB&T						NBAZ					NSB
	2017		2016			2017		2016		2017			2016			2017			2016		2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	483	$	462		$	359	$	344	$	351		$	322		$	153		$	140	$	98		$	91
Provision for loan losses	18		(31		)	41		159		(10		)	(1		)	(7		)	2		(8		)	(29		)
Net interest income after provision for loan losses	465		493			318		185		361			323			160			138		106			120
Noninterest income	112		112			87		90		56			51			29			30		30			29
Noninterest expense	327		320			259		244		225			221			111			109		105			104
Income (loss) before income taxes	$	250	$	285		$	146	$	31	$	192		$	153		$	78		$	59	$	31		$	45
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	12,505	$	12,512		$	10,890	$	10,599	$	9,453		$	9,170		$	4,258		$	4,010	$	2,352		$	2,275
Total deposits	16,001		15,866			11,131		11,100		10,953			10,764			4,747			4,553		4,240			4,113
(In millions)	Vectra					TCBW				Other						Consolidated Company
	2017		2016			2017		2016		2017			2016			2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	93	$	90		$	34	$	28	$	(32	)	$	(91	)	$	1,539		$	1,386
Provision for loan losses	—		(4		)	2		—		(1		)	(1		)	35			95
Net interest income after provision for loan losses	93		94			32		28		(31		)	(90		)	1,504			1,291
Noninterest income	19		17			3		3		68			56			404			388
Noninterest expense	75		73			16		15		114			95			1,232			1,181
Income (loss) before income taxes	$	37	$	38		$	19	$	16	$	(77	)	$	(129	)	$	676		$	498
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	2,607	$	2,453		$	909	$	769	$	244		$	80		$	43,218		$	41,868
Total deposits	2,758		2,704			1,098		970		1,227			(8		)	52,155			50,062

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Basis of Presentaion Organization and Presentation (Policies)

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements of Zions Bancorporation (“the Parent”) and its majority-owned subsidiaries (collectively “the Company,” “Zions,” “we,” “our,” “us”) have been prepared in accordance with 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, they 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 have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”), are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force (“EITF”). In certain cases, ASUs are issued jointly with International Financial Reporting Standards (“IFRS”).

Operating results for the nine months endedSeptember 30, 2017 and 2016 are not necessarily indicative of the results that may be expected in future periods. In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated balance sheet at December 31, 2016 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s 2016 Annual Report on Form 10-K. Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income or shareholders’ equity.

Zions Bancorporation (“the Parent”) is a financial holding company headquartered in Salt Lake City, Utah, which owns and operates a commercial bank. The Parent and its subsidiaries (collectively “the Company”) provide a full range of banking and related services in 11 Western and Southwestern states through seven separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; California Bank & Trust (“CB&T”); Amegy Bank (“Amegy”), in Texas; National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon (“TCBO”) in Oregon. The Parent also owns and operates certain nonbank subsidiaries that engage in financial services.

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Fair Value (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis

(In millions)	September 30, 2017
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,814	$	—	$	13,839
Municipal securities			1,291				1,291
Other debt securities			25				25
Money market mutual funds and other	86		1				87
	111		15,131		—		15,242
Trading account			56				56
Other noninterest-bearing investments:
Bank-owned life insurance			504				504
Private equity investments					93		93
Other assets:
Agriculture loan servicing and interest-only strips					19		19
Deferred compensation plan assets	97						97
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			36				36
Foreign currency exchange contracts	6						6
	6		37		—		43
	$	214	$	15,728	$	112	$	16,054
LIABILITIES
Securities sold, not yet purchased	$	48	$	—	$	—	$	48
Other liabilities:
Deferred compensation plan obligations	97						97
Derivatives:
Interest rate swaps for customers			30				30
Foreign currency exchange contracts	5						5
	5		30		—		35
	$	150	$	30	$	—	$	180

¹We used a third-party pricing service to measure fair value for approximately 92% of our AFS Level 2 securities.

(In millions)	December 31, 2016
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	—	$	12,009	$	—	$	12,009
Municipal securities			1,154				1,154
Other debt securities			24				24
Money market mutual funds and other	184		1				185
	184		13,188		—		13,372
Trading account			115				115
Other noninterest-bearing investments:
Bank-owned life insurance			497				497
Private equity investments 2	18				73		91
Other assets:
Agriculture loan servicing and interest-only strips					20		20
Deferred compensation plan assets	91						91
Derivatives:
Interest rate swaps and forwards			4				4
Interest rate swaps for customers			49				49
Foreign currency exchange contracts	11						11
	11		53		—		64
	$	304	$	13,853	$	93	$	14,250
LIABILITIES
Securities sold, not yet purchased	$	25	$	—	$	—	$	25
Other liabilities:
Deferred compensation plan obligations	91						91
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			49				49
Foreign currency exchange contracts	9						9
	9		50		—		59
	$	125	$	50	$	—	$	175

¹We used a third-party pricing service to measure fair value for approximately 91% of our AFS Level 2 securities.

² The Level 1 private equity investments amount relates to the portion of our SBIC investments that are now publicly traded.

Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs

	Level 3 Instruments
	Three Months Ended								Nine Months Ended
	September 30, 2017				September 30, 2016				September 30, 2017						September 30, 2016
(In millions)	Private equity investments		Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments			Ag loan svcg and int-only strips			Private equity investments		Ag loan svcg and int-only strips
Balance at beginning of period	$	82	$	19	$	64	$	18	$	73		$	20		$	58	$	14
Securities gains, net	5		—		1		—		7			—			3		—
Other noninterest income	—		—		—		2		—			(1		)	—		6
Purchases	6		—		2		—		18			—			6		—
Redemptions and paydowns	—		—		—		—		(5		)	—			—		—
Balance at end of period	$	93	$	19	$	67	$	20	$	93		$	19		$	67	$	20

Schedule Of Realized Gains (Losses) Using Level 3 Inputs

(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Securities gains, net	$	—	$	4	$	3	$	4

Schedule Of Assets With Fair Value Changes On Nonrecurring Basis

(In millions)	Fair value at September 30, 2017								Fair value at December 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS
Private equity investments	$	—	$	—	$	1	$	1	$	—	$	—	$	1	$	1
Impaired loans	—		17		—		17		—		52		—		52
Other real estate owned	—		—		—		—		—		1		—		1
	$	—	$	17	$	1	$	18	$	—	$	53	$	1	$	54

The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value.

	Gains (losses) from fair value changes
(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
ASSETS
Private equity investments	$	—		$	—		$	(1	)	$	—
Impaired loans	(1		)	(5		)	(8		)	(34		)
Other real estate owned	—			(1		)	—			(1		)
	$	(1	)	$	(6	)	$	(9	)	$	(35	)

Fair Value, by Balance Sheet Grouping [Table Text Block]

	September 30, 2017					December 31, 2016
(In millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
HTM investment securities	$	746	$	743	2	$	868	$	850	2
Loans and leases (including loans held for sale), net of allowance	43,686		43,196		3	42,254		42,111		3
Financial liabilities:
Time deposits	2,909		2,890		2	2,757		2,744		2
Other short-term borrowings	3,250		3,250		2	500		500		2
Long-term debt	383		406		2	535		552		2

	September 30, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	779	$	(312	)	$	467	$	—		$	—		$	467
Derivatives (included in other assets)	43		—			43		(15		)	—			28
Total assets	$	822	$	(312	)	$	510	$	(15	)	$	—		$	495
Liabilities:
Federal funds and other short-term borrowings	$	4,936	$	(312	)	$	4,624	$	—		$	—		$	4,624
Derivatives (included in other liabilities)	35		—			35		(15		)	(11		)	9
Total Liabilities	$	4,971	$	(312	)	$	4,659	$	(15	)	$	(11	)	$	4,633

	December 31, 2016
(In millions)							Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	568	$	—	$	568	$	—		$	—		$	568
Derivatives (included in other assets)	64		—		64		(17		)	—			47
Total assets	$	632	$	—	$	632	$	(17	)	$	—		$	615
Liabilities:
Federal funds and other short-term borrowings	$	827	$	—	$	827	$	—		$	—		$	827
Derivatives (included in other liabilities)	59		—		59		(17		)	(17		)	25
Total Liabilities	$	886	$	—	$	886	$	(17	)	$	(17	)	$	852

XML

Offsetting Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2017

Offsetting Assets and Liabilities [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	September 30, 2017					December 31, 2016
(In millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
HTM investment securities	$	746	$	743	2	$	868	$	850	2
Loans and leases (including loans held for sale), net of allowance	43,686		43,196		3	42,254		42,111		3
Financial liabilities:
Time deposits	2,909		2,890		2	2,757		2,744		2
Other short-term borrowings	3,250		3,250		2	500		500		2
Long-term debt	383		406		2	535		552		2

	September 30, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	779	$	(312	)	$	467	$	—		$	—		$	467
Derivatives (included in other assets)	43		—			43		(15		)	—			28
Total assets	$	822	$	(312	)	$	510	$	(15	)	$	—		$	495
Liabilities:
Federal funds and other short-term borrowings	$	4,936	$	(312	)	$	4,624	$	—		$	—		$	4,624
Derivatives (included in other liabilities)	35		—			35		(15		)	(11		)	9
Total Liabilities	$	4,971	$	(312	)	$	4,659	$	(15	)	$	(11	)	$	4,633

	December 31, 2016
(In millions)							Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	568	$	—	$	568	$	—		$	—		$	568
Derivatives (included in other assets)	64		—		64		(17		)	—			47
Total assets	$	632	$	—	$	632	$	(17	)	$	—		$	615
Liabilities:
Federal funds and other short-term borrowings	$	827	$	—	$	827	$	—		$	—		$	827
Derivatives (included in other liabilities)	59		—		59		(17		)	(17		)	25
Total Liabilities	$	886	$	—	$	886	$	(17	)	$	(17	)	$	852

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Investment Securities (Tables)

9 Months Ended

Sep. 30, 2017

Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]

Summary Of Investment Securities

	September 30, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	746	$	7	$	10	$	743
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,839		5		4		1,840
Agency guaranteed mortgage-backed securities	9,748		21		86		9,683
Small Business Administration loan-backed securities	2,281		19		9		2,291
Municipal securities	1,281		15		5		1,291
Other debt securities	25		—		—		25
	15,199		60		104		15,155
Money market mutual funds and other	87		—		—		87
	15,286		60		104		15,242
Total	$	16,032	$	67	$	114	$	15,985

	December 31, 2016
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	868	$	5	$	23	$	850
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	1,846		2		9		1,839
Agency guaranteed mortgage-backed securities	7,986		7		110		7,883
Small Business Administration loan-backed securities	2,298		8		18		2,288
Municipal securities	1,182		1		29		1,154
Other debt securities	25		—		1		24
	13,337		18		167		13,188
Money market mutual funds and other	184		—		—		184
	13,521		18		167		13,372
Total	$	14,389	$	23	$	190	$	14,222

Contractual Maturities Debt Securities

	September 30, 2017
	Held-to-maturity				Available-for-sale
(In millions)	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value
Principal return in one year or less	$	99	$	100	$	2,296	$	2,285
Principal return after one year through five years	282		284		5,406		5,384
Principal return after five years through ten years	186		188		4,784		4,779
Principal return after ten years	179		171		2,713		2,707
Total	$	746	$	743	$	15,199	$	15,155

Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value

	September 30, 2017
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	1	$	175	$	9	$	132	$	10	$	307
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	3		576		1		331		4		907
Agency guaranteed mortgage-backed securities	74		6,266		12		677		86		6,943
Small Business Administration loan-backed securities	1		149		8		749		9		898
Municipal securities	3		321		2		122		5		443
Other	—		—		—		—		—		—
Available-for-sale total	81		7,312		23		1,879		104		9,191
Total	$	82	$	7,487	$	32	$	2,011	$	114	$	9,498

	December 31, 2016
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value
Held-to-maturity
Municipal securities	$	15	$	467	$	8	$	61	$	23	$	528
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	9		950		—		127		9		1,077
Agency guaranteed mortgage-backed securities	102		6,649		7		326		109		6,975
Small Business Administration loan-backed securities	3		527		16		841		19		1,368
Municipal securities	28		992		—		9		28		1,001
Other	—		—		2		14		2		14
Available-for-sale total	142		9,118		25		1,317		167		10,435
Total	$	157	$	9,585	$	33	$	1,378	$	190	$	10,963

Gains And Losses, Including OTTI, Recognized In Statement Of Income

	Three Months Ended								Nine Months Ended
	September 30, 2017				September 30, 2016				September 30, 2017				September 30, 2016
(In millions)	Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross  losses
Investment securities:
Other noninterest-bearing investments	$	5	$	—	$	8	$	—	$	20	$	7	$	15	$	4
Net gains 1			$	5			$	8			$	13			$	11

Tax and Nontaxable Interest Income by Investment Type [Table Text Block]

(In millions)	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	7	$	10	$	17
Available-for-sale	72		6		78		209		18		227
Trading	1		—		1		2		—		2
Total	$	75	$	9	$	84	$	218	$	28	$	246

(In millions)	Three Months Ended September 30, 2016						Nine Months Ended September 30, 2016
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	7	$	9	$	16
Available-for-sale	40		3		43		118		8		126
Trading	1		—		1		1		—		1
Total	$	43	$	6	$	49	$	126	$	17	$	143

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Loans And Allowance For Credit Losses (Tables)

9 Months Ended

Sep. 30, 2017

Accounts, Notes, Loans and Financing Receivable [Line Items]

Investment of accuring and nonaccruing troubled debt restructuring [Text Block]

	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing			Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	1	1,291	$	1
Owner-occupied	—		—		—		—		1		5,405	1
Total commercial	—		1		1		—		2			2
Total	$	—	$	1	$	1	$	—	$	2		$	2

	Three Months Ended September 30, 2016						Nine Months Ended September 30, 2016
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	3	$	3	$	—	$	3	$	3
Owner-occupied	4		—		4		4		—		4
Total commercial	4		3		7		4		3		7
Total	$	4	$	3	$	7	$	4	$	3	$	7

Note: Total loans modified as TDRs during the 12 months previous to September 30, 2017 and 2016 were $84 millionand $139 million, respectively.

allowance for loan losses by impairment [Table Text Block]

The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows:
	September 30, 2017
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	28	$	1	$	4	$	33
Collectively evaluated for impairment	357		106		45		508
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	385	$	107	$	49	$	541
Outstanding loan balances:
Individually evaluated for impairment	$	352	$	78	$	70	$	500
Collectively evaluated for impairment	22,163		11,026		10,427		43,616
Purchased loans with evidence of credit deterioration	24		10		6		40
Total	$	22,539	$	11,114	$	10,503	$	44,156

	December 31, 2016
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	56	$	3	$	6	$	65
Collectively evaluated for impairment	364		113		25		502
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	420	$	116	$	31	$	567
Outstanding loan balances:
Individually evaluated for impairment	$	466	$	78	$	75	$	619
Collectively evaluated for impairment	21,111		11,231		9,611		41,953
Purchased loans with evidence of credit deterioration	38		32		7		77
Total	$	21,615	$	11,341	$	9,693	$	42,649

Summary Of Major Portfolio Segment And Specific Loan Class

(In millions)	September 30, 2017		December 31, 2016
Loans held for sale	$	71	$	172
Commercial:
Commercial and industrial	$	14,041	$	13,452
Leasing	343		423
Owner-occupied	7,082		6,962
Municipal	1,073		778
Total commercial	22,539		21,615
Commercial real estate:
Construction and land development	2,170		2,019
Term	8,944		9,322
Total commercial real estate	11,114		11,341
Consumer:
Home equity credit line	2,745		2,645
1-4 family residential	6,522		5,891
Construction and other consumer real estate	558		486
Bankcard and other revolving plans	490		481
Other	188		190
Total consumer	10,503		9,693
Total loans	$	44,156	$	42,649

Summary Of Changes in The Allowance For Credit Losses

Changes in the allowance for credit losses are summarized as follows:
	Three Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	393		$	116		$	35		$	544
Additions:
Provision for loan losses	(4		)	(7		)	16			5
Deductions:
Gross loan and lease charge-offs	(16		)	(4		)	(5		)	(25		)
Recoveries	12			2			3			17
Net loan and lease charge-offs	(4		)	(2		)	(2		)	(8		)
Balance at end of period	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	53		$	10		$	—		$	63
Provision charged to earnings	(4		)	—			—			(4		)
Balance at end of period	$	49		$	10		$	—		$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments	49			10			—			59
Total allowance for credit losses	$	434		$	117		$	49		$	600

	Nine Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	420		$	116		$	31		$	567
Additions:
Provision for loan losses	27			(15		)	23			35
Deductions:
Gross loan and lease charge-offs	(98		)	(6		)	(13		)	(117		)
Recoveries	36			12			8			56
Net loan and lease (charge-offs) recoveries	(62		)	6			(5		)	(61		)
Balance at end of period	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—		$	65
Provision credited to earnings	(5		)	(1		)	—			(6		)
Balance at end of period	$	49		$	10		$	—		$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49		$	541
Reserve for unfunded lending commitments	49			10			—			59
Total allowance for credit losses	$	434		$	117		$	49		$	600

	Three Months Ended September 30, 2016
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	457		$	121		$	30		$	608
Additions:
Provision for loan losses	22			(6		)	3			19
Deductions:
Gross loan and lease charge-offs	(48		)	(1		)	(5		)	(54		)
Recoveries	15			7			2			24
Net loan and lease (charge-offs) recoveries	(33		)	6			(3		)	(30		)
Balance at end of period	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—		$	65
Provision credited to earnings	(2		)	(1		)	—			(3		)
Balance at end of period	$	52		$	10		$	—		$	62
Total allowance for credit losses at end of period
Allowance for loan losses	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments	52			10			—			62
Total allowance for credit losses	$	498		$	131		$	30		$	659

	Nine Months Ended September 30, 2016
(In millions)	Commercial			Commercial real estate			Consumer			Total
Allowance for loan losses
Balance at beginning of period	$	454		$	114		$	38		$	606
Additions:
Provision for loan losses	93			5			(3		)	95
Deductions:
Gross loan and lease charge-offs	(137		)	(10		)	(12		)	(159		)
Recoveries	36			12			7			55
Net loan and lease (charge-offs) recoveries	(101		)	2			(5		)	(104		)
Balance at end of period	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments
Balance at beginning of period	$	58		$	16		$	1		$	75
Provision credited to earnings	(6		)	(6		)	(1		)	(13		)
Balance at end of period	$	52		$	10		$	—		$	62
Total allowance for credit losses at end of period
Allowance for loan losses	$	446		$	121		$	30		$	597
Reserve for unfunded lending commitments	52			10			—			62
Total allowance for credit losses	$	498		$	131		$	30		$	659

The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows:
	September 30, 2017
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	28	$	1	$	4	$	33
Collectively evaluated for impairment	357		106		45		508
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	385	$	107	$	49	$	541
Outstanding loan balances:
Individually evaluated for impairment	$	352	$	78	$	70	$	500
Collectively evaluated for impairment	22,163		11,026		10,427		43,616
Purchased loans with evidence of credit deterioration	24		10		6		40
Total	$	22,539	$	11,114	$	10,503	$	44,156

Summary Of Nonaccrual Loans

Nonaccrual loans are summarized as follows:
(In millions)	September 30, 2017		December 31, 2016
Loans held for sale	$	13	$	40
Commercial:
Commercial and industrial	$	257	$	354
Leasing	8		14
Owner-occupied	85		74
Municipal	1		1
Total commercial	351		443
Commercial real estate:
Construction and land development	6		7
Term	41		29
Total commercial real estate	47		36
Consumer:
Home equity credit line	11		11
1-4 family residential	40		36
Construction and other consumer real estate	1		2
Bankcard and other revolving plans	1		1
Other	1		—
Total consumer loans	54		50
Total	$	452	$	529

Summary Of Past Due Loans (Accruing And Nonaccruing)

Past due loans (accruing and nonaccruing) are summarized as follows:
	September 30, 2017
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	58	$	—	$	13	$	13	$	71	$	—	$	—
Commercial:
Commercial and industrial	$	13,870	$	53	$	118	$	171	$	14,041	$	17	$	150
Leasing	343		—		—		—		343		—		8
Owner-occupied	7,021		27		34		61		7,082		5		49
Municipal	1,073		—		—		—		1,073		—		1
Total commercial	22,307		80		152		232		22,539		22		208
Commercial real estate:
Construction and land development	2,158		6		6		12		2,170		1		1
Term	8,925		8		11		19		8,944		2		30
Total commercial real estate	11,083		14		17		31		11,114		3		31
Consumer:
Home equity credit line	2,735		6		4		10		2,745		—		4
1-4 family residential	6,497		10		15		25		6,522		—		20
Construction and other consumer real estate	547		6		5		11		558		4		—
Bankcard and other revolving plans	486		3		1		4		490		1		1
Other	185		3		—		3		188		—		1
Total consumer loans	10,450		28		25		53		10,503		5		26
Total	$	43,840	$	122	$	194	$	316	$	44,156	$	30	$	265

	December 31, 2016
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	172	$	—	$	—	$	—	$	172	$	—	$	40
Commercial:
Commercial and industrial	$	13,306	$	72	$	74	$	146	$	13,452	$	10	$	287
Leasing	423		—		—		—		423		—		14
Owner-occupied	6,894		40		28		68		6,962		8		43
Municipal	778		—		—		—		778		—		1
Total commercial	21,401		112		102		214		21,615		18		345
Commercial real estate:
Construction and land development	2,010		7		2		9		2,019		1		1
Term	9,291		9		22		31		9,322		12		18
Total commercial real estate	11,301		16		24		40		11,341		13		19
Consumer:
Home equity credit line	2,635		4		6		10		2,645		1		5
1-4 family residential	5,857		12		22		34		5,891		—		11
Construction and other consumer real estate	479		3		4		7		486		3		—
Bankcard and other revolving plans	478		2		1		3		481		1		1
Other	189		1		—		1		190		—		—
Total consumer loans	9,638		22		33		55		9,693		5		17
Total	$	42,340	$	150	$	159	$	309	$	42,649	$	36	$	381

¹  Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators

	September 30, 2017
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	12,987	$	357	$	695	$	2	$	14,041
Leasing	325		1		17		—		343
Owner-occupied	6,697		93		292		—		7,082
Municipal	1,072		—		1		—		1,073
Total commercial	21,081		451		1,005		2		22,539		$	385
Commercial real estate:
Construction and land development	2,140		24		6		—		2,170
Term	8,697		84		163		—		8,944
Total commercial real estate	10,837		108		169		—		11,114		107
Consumer:
Home equity credit line	2,728		—		17		—		2,745
1-4 family residential	6,475		—		47		—		6,522
Construction and other consumer real estate	554		—		4		—		558
Bankcard and other revolving plans	487		—		3		—		490
Other	187		—		1		—		188
Total consumer loans	10,431		—		72		—		10,503		49
Total	$	42,349	$	559	$	1,246	$	2	$	44,156	$	541

	December 31, 2016
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	12,185	$	266	$	998	$	3	$	13,452
Leasing	387		5		30		1		423
Owner-occupied	6,560		96		306		—		6,962
Municipal	765		7		6		—		778
Total commercial	19,897		374		1,340		4		21,615		$	420
Commercial real estate:
Construction and land development	1,942		52		25		—		2,019
Term	9,096		82		144		—		9,322
Total commercial real estate	11,038		134		169		—		11,341		116
Consumer:
Home equity credit line	2,629		—		16		—		2,645
1-4 family residential	5,851		—		40		—		5,891
Construction and other consumer real estate	482		—		4		—		486
Bankcard and other revolving plans	478		—		3		—		481
Other	189		—		1		—		190
Total consumer loans	9,629		—		64		—		9,693		31
Total	$	40,564	$	508	$	1,573	$	4	$	42,649	$	567

Summary Of Information On Impaired Loans

	September 30, 2017
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	313	$	109	$	160	$	269	$	25
Owner-occupied	117		64		39		103		3
Municipal	1		1		—		1		—
Total commercial	431		174		199		373		28
Commercial real estate:
Construction and land development	10		5		4		9		—
Term	67		45		12		57		—
Total commercial real estate	77		50		16		66		—
Consumer:
Home equity credit line	24		13		8		21		—
1-4 family residential	61		26		25		51		4
Construction and other consumer real estate	3		2		1		3		—
Other	1		1		—		1		—
Total consumer loans	89		42		34		76		4
Total	$	597	$	266	$	249	$	515	$	32

	December 31, 2016
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	470	$	82	$	311	$	393	$	52
Owner-occupied	115		71		30		101		3
Municipal	1		1		—		1		—
Total commercial	586		154		341		495		55
Commercial real estate:
Construction and land development	22		7		6		13		—
Term	92		53		17		70		2
Total commercial real estate	114		60		23		83		2
Consumer:
Home equity credit line	24		16		7		23		—
1-4 family residential	59		27		28		55		6
Construction and other consumer real estate	3		1		2		3		—
Other	2		1		—		1		—
Total consumer loans	88		45		37		82		6
Total	$	788	$	259	$	401	$	660	$	63

	Three Months Ended September 30, 2017				Nine Months Ended September 30, 2017
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	356	$	1	$	311	$	5
Owner-occupied	104		2		101		5
Municipal	1		—		1		—
Total commercial	461		3		413		10
Commercial real estate:
Construction and land development	10		—		11		—
Term	53		1		58		11
Total commercial real estate	63		1		69		11
Consumer:
Home equity credit line	21		—		21		1
1-4 family residential	53		1		53		1
Construction and other consumer real estate	2		—		2		—
Other	1		—		1		—
Total consumer loans	77		1		77		2
Total	$	601	$	5	$	559	$	23

	Three Months Ended September 30, 2016				Nine Months Ended September 30, 2016
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	449	$	1	$	319	$	4
Owner-occupied	100		2		103		8
Municipal	1		—		1		—
Total commercial	550		3		423		12
Commercial real estate:
Construction and land development	11		1		12		2
Term	74		3		79		9
Total commercial real estate	85		4		91		11
Consumer:
Home equity credit line	23		—		22		1
1-4 family residential	61		1		58		2
Construction and other consumer real estate	3		—		3		—
Other	2		—		2		—
Total consumer loans	89		1		85		3
Total	$	724	$	8	$	599	$	26

Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type

	September 30, 2017
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	4	$	—	$	—	$	11	$	23	$	38
Owner-occupied	2		—		1		—		7		13		23
Total commercial	2		4		1		—		18		36		61
Commercial real estate:
Construction and land development	—		2		—		—		—		2		4
Term	4		—		—		1		2		7		14
Total commercial real estate	4		2		—		1		2		9		18
Consumer:
Home equity credit line	—		2		10		—		—		3		15
1-4 family residential	1		—		7		1		2		26		37
Construction and other consumer real estate	—		1		—		—		—		1		2
Total consumer loans	1		3		17		1		2		30		54
Total accruing	7		9		18		2		22		75		133
Nonaccruing
Commercial:
Commercial and industrial	—		1		4		4		46		27		82
Owner-occupied	1		2		—		1		1		9		14
Municipal	—		1		—		—		—		—		1
Total commercial	1		4		4		5		47		36		97
Commercial real estate:
Construction and land development	—		—		—		—		—		—		—
Term	2		1		—		—		1		4		8
Total commercial real estate	2		1		—		—		1		4		8
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		2		—		1		5		8
Construction and other consumer real estate	—		—		—		1		—		—		1
Total consumer loans	—		—		3		1		1		5		10
Total nonaccruing	3		5		7		6		49		45		115
Total	$	10	$	14	$	25	$	8	$	71	$	120	$	248

¹ Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

	December 31, 2016
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	19	$	—	$	—	$	—	$	28	$	47
Owner-occupied	3		—		1		—		8		10		22
Total commercial	3		19		1		—		8		38		69
Commercial real estate:
Construction and land development	—		4		—		—		—		4		8
Term	4		—		—		1		2		10		17
Total commercial real estate	4		4		—		1		2		14		25
Consumer:
Home equity credit line	—		1		10		—		—		3		14
1-4 family residential	3		1		6		—		2		30		42
Construction and other consumer real estate	—		—		—		—		—		1		1
Total consumer loans	3		2		16		—		2		34		57
Total accruing	10		25		17		1		12		86		151
Nonaccruing
Commercial:
Commercial and industrial	1		—		—		1		33		25		60
Owner-occupied	—		1		—		3		1		12		17
Municipal	—		1		—		—		—		—		1
Total commercial	1		2		—		4		34		37		78
Commercial real estate:
Construction and land development	—		—		—		—		2		—		2
Term	2		1		—		—		2		3		8
Total commercial real estate	2		1		—		—		4		3		10
Consumer:
Home equity credit line	—		—		1		—		—		1		2
1-4 family residential	—		—		2		—		1		5		8
Construction and other consumer real estate	—		—		—		2		—		—		2
Total consumer loans	—		—		3		2		1		6		12
Total nonaccruing	3		3		3		6		39		46		100
Total	$	13	$	28	$	20	$	7	$	51	$	132	$	251

¹  Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans

(In millions)	September 30, 2017		December 31, 2016
Commercial	$	36	$	49
Commercial real estate	15		51
Consumer	7		9
Outstanding balance	$	58	$	109
Carrying amount	$	40	$	77
Less ALLL	—		1
Carrying amount, net	$	40	$	76

Schedule Of Changes In The Accretable Yield For PCI Loans

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Balance at beginning of period	$	21		$	38		$	33		$	40
Accretion	(2		)	(6		)	(17		)	(19		)
Reclassification from nonaccretable difference	—			—			(1		)	9
Disposals and other	—			2			4			4
Balance at end of period	$	19		$	34		$	19		$	34

Note: Amounts have been adjusted based on refinements to the original estimates of the accretable yield.

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Derivative Instruments And Hedging Activities Derivative Instruments and Hedging Activities (Tables)

9 Months Ended

Sep. 30, 2017

Summary of Derivative Instruments [Abstract]

Schedule of Derivative Instruments

	September 30, 2017						December 31, 2016
	Notional amount		Fair value				Notional amount		Fair value
(In millions)			Other assets		Other liabilities				Other assets		Other liabilities
Derivatives designated as hedging instruments:
Cash flow hedges:
Interest rate swaps	$	1,138	$	—	$	—	$	1,388	$	2	$	1
Derivatives not designated as hedging instruments:
Interest rate swaps and forwards	205		1		—		235		2		—
Interest rate swaps for customers 1	4,598		36		30		4,162		49		49
Foreign exchange	280		6		5		424		11		9
Total derivatives not designated as hedging instruments	5,083		43		35		4,821		62		58
Total derivatives	$	6,221	$	43	$	35	$	6,209	$	64	$	59

¹ Notional amounts include both the customer swaps and the offsetting derivative contracts.

Schedule Of Gain (Loss) Of Derivative Instruments

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2017								Nine Months Ended September 30, 2017
(In millions)	OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)			Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	—	$	—					$	—	$	3
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts					$	—							$	(1	)
Interest rate swaps for customers					4								8
Foreign exchange					4								12
Total derivatives	$	—	$	—	$	8	$	—	$	—	$	3	$	19		$	—

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2016									Nine Months Ended September 30, 2016
(In millions)	OCI			Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	(5	)	$	3					$	23	$	9
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts						$	1							$	3
Interest rate swaps for customers						4								5
Foreign exchange						3								8
Total derivatives	$	(5	)	$	3	$	8	$	—	$	23	$	9	$	16	$	—

Note: These schedules are not intended to present at any given time the Company’s long/short position with respect to its derivative contracts.

¹  Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2017, we estimate that $2 million will be reclassified from AOCI into interest income.

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Debt And Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt is summarized as follows:

(In millions)	September 30, 2017		December 31, 2016
Subordinated notes	$	247	$	247
Senior notes	135		287
Capital lease obligations	1		1
Total	$	383	$	535

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

	Amounts reclassified from AOCI 1				Amounts reclassified from AOCI 1				Statement of income (SI) Balance sheet (BS)
(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
Details about AOCI components	2017		2016		2017		2016			Affected line item
Net unrealized gains on derivative instruments	$	—	$	3	$	3	$	9	SI	Interest and fees on loans
Income tax expense	—		1		1		4
Amounts Reclassified from AOCI	$	—	$	2	$	2	$	5

¹  Positive reclassification amounts indicate increases to earnings in the statement of income and decreases to balance sheet assets.

Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)

(In millions)	Net unrealized gains (losses) on investment securities			Net unrealized gains (losses) on derivatives and other			Pension and post-retirement			Total
Nine Months Ended September 30, 2017
Balance at December 31, 2016	$	(93	)	$	2		$	(31	)	$	(122	)
OCI before reclassifications, net of tax	65			2			—			67
Amounts reclassified from AOCI, net of tax	—			(2		)	—			(2		)
OCI	65			—			—			65
Balance at September 30, 2017	$	(28	)	$	2		$	(31	)	$	(57	)
Income tax expense included in OCI	$	40		$	—		$	—		$	40
Nine Months Ended September 30, 2016
Balance at December 31, 2015	$	(18	)	$	2		$	(38	)	$	(54	)
OCI (loss) before reclassifications, net of tax	54			16			(1		)	69
Amounts reclassified from AOCI, net of tax	—			(5		)	—			(5		)
OCI (loss)	54			11			(1		)	64
Balance at September 30, 2016	$	36		$	13		$	(39	)	$	10
Income tax expense included in OCI (loss)	$	34		$	6		$	1		$	41

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Debt And Shareholders' Equity Schedule of Long-term Debt Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Debt Instrument [Line Items]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt is summarized as follows:

(In millions)	September 30, 2017		December 31, 2016
Subordinated notes	$	247	$	247
Senior notes	135		287
Capital lease obligations	1		1
Total	$	383	$	535

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Debt And Shareholders' Equity Junior Subordinated Notes (Tables)

9 Months Ended

Sep. 30, 2016

Subordinated Borrowing [Line Items]

Subordinated Borrowings Disclosure [Text Block]

(Dollar amounts in millions)	Balance Redeemed		Coupon rate 1	Redemption date
Amegy Statutory Trust I	$	51	3mL+2.85%	September 17, 2016
Amegy Statutory Trust III	62		3mL+1.78%	September 15, 2016
Stockmen’s Statutory Trust II	8		3mL+3.15%	September 26, 2016
Stockmen’s Statutory Trust III	8		3mL+2.89%	September 17, 2016
Total	$	129

¹  Designation of “3mL” is three-month London Interbank Offered Rate (“LIBOR”).

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Commitments, Guarantees, And Contingent Liabilities (Tables)

9 Months Ended

Sep. 30, 2017

Guarantees, Commitments And Contingencies [Abstract]

Schedule Of Guarantees Issued

(In millions)	September 30, 2017		December 31, 2016
Net unfunded commitments to extend credit 1	$	18,828	$	18,274
Standby letters of credit:
Financial	709		771
Performance	202		196
Commercial letters of credit	43		60
Total unfunded lending commitments	$	19,782	$	19,301

¹  Net of participations

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Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2017

Defined Benefit Plan [Abstract]

Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest cost	$	2		$	2		$	5		$	5
Expected return on plan assets	(3		)	(3		)	(9		)	(9		)
Partial settlement loss	1			3			2			3
Amortization of net actuarial loss	1			1			4			5
Net periodic benefit cost	$	1		$	3		$	2		$	4

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Operating Segment Information (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting Information [Line Items]

Operating Segment Information

. OPERATING SEGMENT INFORMATION

We manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process continues to be refined. Total average loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment. Prior period amounts have been reclassified to reflect these changes.

As of September 30, 2017, Zions Bank operates 98 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. Amegy operates 73 branches in Texas. CB&T operates 92 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates one branch in Washington and one branch in Oregon.

The operating segment identified as “Other” includes the Parent, Zions Management Services Company, certain nonbank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments. Throughout 2016 consolidation efforts continued, which resulted in transitioning full-time equivalents from the business segments to the Company’s back-office units. Due to the continuing nature and timing of this change, the Company’s back-office units retained more direct expenses in 2016 than in prior years. In the first quarter of 2017 we made changes to the FTP process and internal allocation of central expenses to better reflect the performance of business segments. Prior period amounts have been revised to reflect the impact of these changes had they been instituted in 2016.

The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Parent’s net interest income includes interest expense on other borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment.

The accounting policies of the individual operating segments are the same as those of the Company. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations.

The following schedule presents selected operating segment information for the three months ended September 30, 2017 and 2016:

(In millions)	Zions Bank						Amegy				CB&T						NBAZ					NSB
	2017			2016			2017		2016		2017			2016			2017			2016		2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	164		$	157		$	122	$	114	$	118		$	110		$	53		$	48	$	34		$	31
Provision for loan losses	(15		)	(1		)	33		24		(4		)	(2		)	(8		)	—		(3		)	(4		)
Net interest income after provision for loan losses	179			158			89		90		122			112			61			48		37			35
Noninterest income	39			39			28		32		20			18			10			11		11			10
Noninterest expense	107			108			86		75		74			75			38			36		35			34
Income (loss) before income taxes	$	111		$	89		$	31	$	47	$	68		$	55		$	33		$	23	$	13		$	11
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	12,543		$	12,629		$	11,170	$	10,666	$	9,575		$	9,341		$	4,267		$	4,156	$	2,347		$	2,288
Total deposits	15,773			15,948			10,862		11,068		11,021			10,929			4,816			4,632		4,276			4,223
(In millions)	Vectra						TCBW				Other						Consolidated Company
	2017			2016			2017		2016		2017			2016			2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	32		$	31		$	12	$	10	$	(13	)	$	(32	)	$	522		$	469
Provision for loan losses	—			2			3		—		(1		)	—			5			19
Net interest income after provision for loan losses	32			29			9		10		(12		)	(32		)	517			450
Noninterest income	7			6			1		1		23			28			139			145
Noninterest expense	25			25			5		5		43			45			413			403
Income (loss) before income taxes	$	14		$	10		$	5	$	6	$	(32	)	$	(49	)	$	243		$	192
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	2,683		$	2,489		$	939	$	796	$	308		$	122		$	43,832		$	42,487
Total deposits	2,757			2,663			1,098		1,010		1,318			202			51,921			50,675

The following schedule presents selected operating segment information for the nine months ended September 30, 2017 and 2016:

(In millions)	Zions Bank					Amegy				CB&T						NBAZ					NSB
	2017		2016			2017		2016		2017			2016			2017			2016		2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	483	$	462		$	359	$	344	$	351		$	322		$	153		$	140	$	98		$	91
Provision for loan losses	18		(31		)	41		159		(10		)	(1		)	(7		)	2		(8		)	(29		)
Net interest income after provision for loan losses	465		493			318		185		361			323			160			138		106			120
Noninterest income	112		112			87		90		56			51			29			30		30			29
Noninterest expense	327		320			259		244		225			221			111			109		105			104
Income (loss) before income taxes	$	250	$	285		$	146	$	31	$	192		$	153		$	78		$	59	$	31		$	45
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	12,505	$	12,512		$	10,890	$	10,599	$	9,453		$	9,170		$	4,258		$	4,010	$	2,352		$	2,275
Total deposits	16,001		15,866			11,131		11,100		10,953			10,764			4,747			4,553		4,240			4,113
(In millions)	Vectra					TCBW				Other						Consolidated Company
	2017		2016			2017		2016		2017			2016			2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	93	$	90		$	34	$	28	$	(32	)	$	(91	)	$	1,539		$	1,386
Provision for loan losses	—		(4		)	2		—		(1		)	(1		)	35			95
Net interest income after provision for loan losses	93		94			32		28		(31		)	(90		)	1,504			1,291
Noninterest income	19		17			3		3		68			56			404			388
Noninterest expense	75		73			16		15		114			95			1,232			1,181
Income (loss) before income taxes	$	37	$	38		$	19	$	16	$	(77	)	$	(129	)	$	676		$	498
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	2,607	$	2,453		$	909	$	769	$	244		$	80		$	43,218		$	41,868
Total deposits	2,758		2,704			1,098		970		1,227			(8		)	52,155			50,062

Schedule of Segment Reporting Information, by Segment

(In millions)	Zions Bank						Amegy				CB&T						NBAZ					NSB
	2017			2016			2017		2016		2017			2016			2017			2016		2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	164		$	157		$	122	$	114	$	118		$	110		$	53		$	48	$	34		$	31
Provision for loan losses	(15		)	(1		)	33		24		(4		)	(2		)	(8		)	—		(3		)	(4		)
Net interest income after provision for loan losses	179			158			89		90		122			112			61			48		37			35
Noninterest income	39			39			28		32		20			18			10			11		11			10
Noninterest expense	107			108			86		75		74			75			38			36		35			34
Income (loss) before income taxes	$	111		$	89		$	31	$	47	$	68		$	55		$	33		$	23	$	13		$	11
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	12,543		$	12,629		$	11,170	$	10,666	$	9,575		$	9,341		$	4,267		$	4,156	$	2,347		$	2,288
Total deposits	15,773			15,948			10,862		11,068		11,021			10,929			4,816			4,632		4,276			4,223
(In millions)	Vectra						TCBW				Other						Consolidated Company
	2017			2016			2017		2016		2017			2016			2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	32		$	31		$	12	$	10	$	(13	)	$	(32	)	$	522		$	469
Provision for loan losses	—			2			3		—		(1		)	—			5			19
Net interest income after provision for loan losses	32			29			9		10		(12		)	(32		)	517			450
Noninterest income	7			6			1		1		23			28			139			145
Noninterest expense	25			25			5		5		43			45			413			403
Income (loss) before income taxes	$	14		$	10		$	5	$	6	$	(32	)	$	(49	)	$	243		$	192
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	2,683		$	2,489		$	939	$	796	$	308		$	122		$	43,832		$	42,487
Total deposits	2,757			2,663			1,098		1,010		1,318			202			51,921			50,675

The following schedule presents selected operating segment information for the nine months ended September 30, 2017 and 2016:

(In millions)	Zions Bank					Amegy				CB&T						NBAZ					NSB
	2017		2016			2017		2016		2017			2016			2017			2016		2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	483	$	462		$	359	$	344	$	351		$	322		$	153		$	140	$	98		$	91
Provision for loan losses	18		(31		)	41		159		(10		)	(1		)	(7		)	2		(8		)	(29		)
Net interest income after provision for loan losses	465		493			318		185		361			323			160			138		106			120
Noninterest income	112		112			87		90		56			51			29			30		30			29
Noninterest expense	327		320			259		244		225			221			111			109		105			104
Income (loss) before income taxes	$	250	$	285		$	146	$	31	$	192		$	153		$	78		$	59	$	31		$	45
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	12,505	$	12,512		$	10,890	$	10,599	$	9,453		$	9,170		$	4,258		$	4,010	$	2,352		$	2,275
Total deposits	16,001		15,866			11,131		11,100		10,953			10,764			4,747			4,553		4,240			4,113
(In millions)	Vectra					TCBW				Other						Consolidated Company
	2017		2016			2017		2016		2017			2016			2017			2016
SELECTED INCOME STATEMENT DATA
Net interest income	$	93	$	90		$	34	$	28	$	(32	)	$	(91	)	$	1,539		$	1,386
Provision for loan losses	—		(4		)	2		—		(1		)	(1		)	35			95
Net interest income after provision for loan losses	93		94			32		28		(31		)	(90		)	1,504			1,291
Noninterest income	19		17			3		3		68			56			404			388
Noninterest expense	75		73			16		15		114			95			1,232			1,181
Income (loss) before income taxes	$	37	$	38		$	19	$	16	$	(77	)	$	(129	)	$	676		$	498
SELECTED AVERAGE BALANCE SHEET DATA
Total loans	$	2,607	$	2,453		$	909	$	769	$	244		$	80		$	43,218		$	41,868
Total deposits	2,758		2,704			1,098		970		1,227			(8		)	52,155			50,062

XML

Basis of Presentaion (Details)	Sep. 30, 2017 States
Basis Of Presentation [Abstract]
Number of States in which Entity Operates	11

XML

Certain Recent Accounting Pronouncements Certain Recent Accounting Pronouncements (Details) $ in Millions	Dec. 31, 2016 USD ($)
Accounting Policies [Abstract]
Operating Leases, Future Minimum Payments Due	$ 275

XML

Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Other noninterest-bearing investments valued under the cost method	$ 10,000,000		$ 10,000,000		$ 13,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	324,000,000		324,000,000		211,000,000
Net gains on sale of OREO properties	(1,000,000)	$ 0	(1,000,000)	$ (2,000,000)
Principal amount of other real estate owned property sold			5,000,000	8,000,000
Equity Method Investments, Fair Value Disclosure	35,000,000		35,000,000		38,000,000
OREO Properties [Member]
Derivatives, Fair Value [Line Items]
Net gains on sale of OREO properties	1,000,000		2,000,000	$ 3,000,000
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	15,131,000,000		15,131,000,000		13,188,000,000
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0		0		0
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	$ 0.92		$ 0.92		$ 0.91

XML

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities	$ 56	$ 115
Other Assets, Fair Value Disclosure	97	91
Other Liabilities, Fair Value Disclosure	97	91
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	112	93
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	15,728	13,853
Financial and Nonfinancial Liabilities, Fair Value Disclosure	30	50
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	214	304
Financial and Nonfinancial Liabilities, Fair Value Disclosure	150	125
Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	87	185
Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	504	497
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	93	91
Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	19	20
Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,839	12,009
Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,291	1,154
Available-for-sale Securities [Member] | Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25
Asset-Backed Securities [Member] | Other Credit Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure		24
Derivative [Member] | Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	1	4
Other Liabilities, Fair Value Disclosure		1
Derivative [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	36	49
Other Liabilities, Fair Value Disclosure	30	49
Derivative [Member] | Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	6	11
Other Liabilities, Fair Value Disclosure	5	9
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	15,131	13,188
Trading Securities	56	115
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1	1
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	504	497
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,814	12,009
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,291	1,154
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member] | Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25
Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] | Other (Including ABS CDOs) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure		24
Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	37	53
Other Liabilities, Fair Value Disclosure	30	50
Fair Value, Inputs, Level 2 [Member] | Derivative [Member] | Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	1	4
Other Liabilities, Fair Value Disclosure		1
Fair Value, Inputs, Level 2 [Member] | Derivative [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	36	49
Other Liabilities, Fair Value Disclosure	30	49
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0	0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	93	73
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	19	20
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] | Other (Including ABS CDOs) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	0	0
Other Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	111	184
Other Assets, Fair Value Disclosure	97	91
Financial Instruments Sold, Not yet Purchased, at Fair Value	48	25
Other Liabilities, Fair Value Disclosure	97	91
Fair Value, Inputs, Level 1 [Member] | Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	86	184
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure		18
Fair Value, Inputs, Level 1 [Member] | Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25	0
Fair Value, Inputs, Level 1 [Member] | Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	6	11
Other Liabilities, Fair Value Disclosure	5	9
Fair Value, Inputs, Level 1 [Member] | Derivative [Member] | Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	6	11
Other Liabilities, Fair Value Disclosure	$ 5	$ 9

XML

Fair Value (Schedule Of Key Model Inputs And Assumptions Used To Fair Value Certain Asset-Backed Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Trading Securities	$ 56	$ 115
Other Assets, Fair Value Disclosure	97	91
Other Liabilities, Fair Value Disclosure	97	91
Estimate of Fair Value Measurement [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	15,242	13,372
Trading Securities	56	115
Assets, Fair Value Disclosure	16,054	14,250
Financial Instruments Sold, Not yet Purchased, at Fair Value	48	25
Financial and Nonfinancial Liabilities, Fair Value Disclosure	180	175
Estimate of Fair Value Measurement [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	43	64
Other Liabilities, Fair Value Disclosure	35	59
Interest Rate Contract [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	1	4
Other Liabilities, Fair Value Disclosure		1
Fair Value, Inputs, Level 3 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	112	93
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	15,728	13,853
Financial and Nonfinancial Liabilities, Fair Value Disclosure	30	50
Fair Value, Inputs, Level 1 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	214	304
Financial and Nonfinancial Liabilities, Fair Value Disclosure	150	125
Foreign Exchange Contract [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	6	11
Other Liabilities, Fair Value Disclosure	5	9
Interest Rate Swap [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	36	49
Other Liabilities, Fair Value Disclosure	30	49
Interest-Only-Strip [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	19	20
Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	93	91
Bank-owned life insurance [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	504	497
Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	87	185
Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	25
Other Credit Derivatives [Member] | Asset-Backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		24
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	1,291	1,154
US Government Corporations and Agencies Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	13,839	12,009
Fair Value, Inputs, Level 2 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	15,131	13,188
Trading Securities	56	115
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	37	53
Other Liabilities, Fair Value Disclosure	30	50
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	1	4
Other Liabilities, Fair Value Disclosure		1
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	36	49
Other Liabilities, Fair Value Disclosure	30	49
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	504	497
Fair Value, Inputs, Level 2 [Member] | Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	1	1
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	25
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	1,291	1,154
Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	13,814	12,009
Fair Value, Inputs, Level 2 [Member] | Other (Including ABS CDOs) [Member] | Asset-Backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		24
Fair Value, Inputs, Level 3 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	0	0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	0	0
Other Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	19	20
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	93	73
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | US Government Corporations and Agencies Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Other (Including ABS CDOs) [Member] | Asset-Backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 1 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	111	184
Other Assets, Fair Value Disclosure	97	91
Financial Instruments Sold, Not yet Purchased, at Fair Value	48	25
Other Liabilities, Fair Value Disclosure	97	91
Fair Value, Inputs, Level 1 [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	6	11
Other Liabilities, Fair Value Disclosure	5	9
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	6	11
Other Liabilities, Fair Value Disclosure	5	9
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure		18
Fair Value, Inputs, Level 1 [Member] | Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	86	184
Fair Value, Inputs, Level 1 [Member] | US Government Corporations and Agencies Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	$ 25	$ 0

XML

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	$ 97		$ 97		$ 91
Other Liabilities, Fair Value Disclosure	97		97		91
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	82	$ 64	73	$ 58
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	5	1	7	3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	6	2	18	6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	5	0
Fair value of assets, Ending balance	93	67	93	67
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	19	18	20	14
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	0	2	(1)	6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	0
Fair value of assets, Ending balance	19	$ 20	19	$ 20
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	97		97		91
Other Liabilities, Fair Value Disclosure	$ 97		$ 97		$ 91

XML

Fair Value (Schedule Of Realized Gains (Losses) Using Level 3 Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	$ 97		$ 97			$ 91
Other Liabilities, Fair Value Disclosure	97		97			91
Level 3 Equity Securities Gains (Losses), Net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	0	$ 4	3	$ 4
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	93	67	93	67	$ 82	73	$ 64	$ 58
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	5	1	7	3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	6	2	18	6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	(5)	0
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	19	20	19	20	$ 19	$ 20	$ 18	$ 14
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	0	2	(1)	6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	$ 0	$ 0	$ 0	$ 0

XML

Fair Value Fair Value (Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Other Credit Derivatives [Member] | Asset-Backed Securities [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Investments, Fair Value Disclosure		$ 24
Fair Value, Inputs, Level 3 [Member]
Summary of Quantitative Information Relating to the Principal Valuation Techniques and Significant Unobservable Inputs for Level 3 [Line Items]
Investments, Fair Value Disclosure	$ 0	$ 0

XML

Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold			$ 5	$ 8
Fair value of assets measured on nonrecurring basis	$ 18		18		$ 54
Gains (losses) from fair value changes	(1)	$ (6)	(9)	(35)
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	17		17		52
Gains (losses) from fair value changes	(1)	(5)	(8)	(34)
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	1		1		1
Gains (losses) from fair value changes	0	0	(1)	0
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		1
Gains (losses) from fair value changes	0	$ (1)	0	$ (1)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 1 [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	17		17		53
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	17		17		52
Fair Value, Inputs, Level 2 [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		1
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	1		1		1
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 3 [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	1		1		1
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	$ 0		$ 0		$ 0

XML

Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity Securities	$ 746	$ 868
Held-to-maturity, fair value	743	850
Time deposits	2,909	2,757
Long-term debt (less fair value hedges)	383	535
Reported Value Measurement [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Loans and leases (including loans held for sale), net of allowance	43,686	42,254
Other Short-term Borrowings	3,250	500
Long-term debt (less fair value hedges)	383	535
Estimate of Fair Value Measurement [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Loans and leases (including loans held for sale), net of allowance	43,196	42,111
Time deposits	2,890	2,744
Other Short-term Borrowings	3,250	500
Long-term debt (less fair value hedges)	$ 406	$ 552

XML

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	$ 467	$ 568
Gross amounts recognized	779	568
Gross amounts offset in the balance sheet	(312)	0
Net amounts presented in the balance sheet	467	568
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Derivative Financial Instruments, Assets [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	28	47
Gross amounts recognized	43	64
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	43	64
Gross amounts not offset in the balance sheet	(15)	(17)
Cash Collateral Received/Pledged	0	0
Assets, Total [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	495	615
Gross amounts recognized	822	632
Gross amounts offset in the balance sheet	(312)	0
Net amounts presented in the balance sheet	510	632
Gross amounts not offset in the balance sheet	(15)	(17)
Cash Collateral Received/Pledged	0	0
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	4,624	827
Gross amounts recognized	4,936	827
Gross amounts offset in the balance sheet	(312)	0
Net amounts presented in the balance sheet	4,624	827
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	9	25
Gross amounts recognized	35	59
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	35	59
Gross amounts not offset in the balance sheet	(15)	(17)
Cash Collateral Received/Pledged	(11)	(17)
Liabilities, Total [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	4,633	852
Gross amounts recognized	4,971	886
Gross amounts offset in the balance sheet	(312)	0
Net amounts presented in the balance sheet	4,659	886
Gross amounts not offset in the balance sheet	(15)	(17)
Cash Collateral Received/Pledged	$ (11)	$ (17)

XML

Investment Securities (Narrative) (Details) $ in Millions	Sep. 30, 2017 USD ($) Securities	Dec. 31, 2016 USD ($) Securities
Investment [Line Items]
Private equity investments prohibited by Volker rule	$ 4
Number of HTM investment securities in an unrealized loss position | Securities	360	642
Number of AFS investment securities in an unrealized loss position | Securities	1,446	2,398
Carrying value of pledged securities	$ 2,300	$ 1,400
Private Equity Investments	138
Commitments for Private Equity and Other Noninterest-bearing Investments	27
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	4
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, Amortized cost	$ 746	$ 868

XML

Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Held-to-maturity, fair value	$ 743	$ 850
Available-for-sale Debt Securities, Amortized Cost Basis	15,199	13,337
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	60	18
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	104	167
Available-for-sale debt securities, Estimated fair value	15,155	13,188
Available-for-sale Securities, Gross Unrealized Gain	60	18
Available-for-sale, Amortized cost	15,286	13,521
Available-for-sale, Gross unrealized losses, Recognized in OCI	104	167
Available-for-sale securities, Estimated fair value	15,242	13,372
amortized cost of investment securities	16,032	14,389
Gross Unrealized Gains of Investment Securities Recognized in OCI	67	23
Gross Unrealized Losses of Investment Securities Recognized in OCI	114	190
Estimated Fair Value of Investment Securities	15,985	14,222
Mutual Funds And Stock [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Unrealized Gain	0	0
Available-for-sale, Amortized cost	87	184
Available-for-sale, Gross unrealized losses, Recognized in OCI	0	0
Available-for-sale securities, Estimated fair value	87	184
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	743	850
Held-to-maturity, Amortized cost	746	868
Available-for-sale Debt Securities, Amortized Cost Basis	1,281	1,182
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	15	1
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	5	29
Available-for-sale debt securities, Estimated fair value	1,291	1,154
Held-to-maturity Securities, Unrecognized Holding Gain	7	5
Held-to-maturity Securities, Unrecognized Holding Loss	10	23
Available-for-sale, Other debt securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	25	25
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0	1
Available-for-sale debt securities, Estimated fair value	25	24
US Treasury Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	25
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0
Available-for-sale debt securities, Estimated fair value	25
Agency Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,839	1,846
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	5	2
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	4	9
Available-for-sale debt securities, Estimated fair value	1,840	1,839
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	9,748	7,986
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	21	7
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	86	110
Available-for-sale debt securities, Estimated fair value	9,683	7,883
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,281	2,298
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	19	8
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	9	18
Available-for-sale debt securities, Estimated fair value	$ 2,291	$ 2,288

XML

Investment Securities (Contractual Maturities Debt Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Investments [Abstract]
Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost	$ 99
Held-to-maturity, Due in one year or less, Estimated fair value	100
Held-to-maturity, Due after one year through five years, Amortized cost	282
Held-to-maturity, Due after one year through five years, Estimated fair value	284
Held-to-maturity, Due after five years through ten years, Amortized cost	186
Held-to-maturity, Due after five years through ten years, Estimated fair value	188
Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost	179
Held-to-maturity, Due after ten years, Estimated fair value	171
Held-to-maturity, Amortized cost	746
Held-to-maturity, fair value	743	$ 850
Available-for-sale, Due in one year or less, Amortized cost	2,296
Available-for-sale, Due in one year or less, Estimated fair value	2,285
Available-for-sale, Due after one year through five years, Amortized cost	5,406
Available-for-sale, Due after one year through five years, Estimated fair value	5,384
Available-for-sale, Due after five years through ten years, Amortized cost	4,784
Available-for-sale, Due after five years through ten years, Estimated fair value	4,779
Available-for-sale, Due after ten years, Amortized cost	2,713
Available-for-sale, Due after ten years, Estimated fair value	2,707
Available-for-sale, Amortized cost	15,199	13,337
Available-for-sale, Estimated fair value	$ 15,155	$ 13,188

XML

Investment Securities (Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Investment Securities Gross Unrealized Losses Less Than 12 Months	$ 82	$ 157
Investment Securities Estimated Fair Value Less Than 12 Months	7,487	9,585
Investment Securities Gross Unrealized Losses 12 Months or More	32	33
Investment Securities Estimated Fair Value 12 Months or More	2,011	1,378
Investment Securities Gross Unrealized Losses Total	114	190
Investment Securities Estimated Fair Value Total	9,498	10,963
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	1	15
Held-to-maturity, Less than 12 months - Estimated fair value	175	467
Held-to-maturity, 12 months or more - Gross unrealized losses	9	8
Held-to-maturity, 12 months or more - Estimated fair value	132	61
Held-to-maturity, Total - Gross unrealized losses	10	23
Held-to-maturity, Total - Estimated fair value	307	528
Available-for-sale, Less than 12 months - Gross unrealized losses	3	28
Available-for-sale, Less than 12 months - Estimated fair value	321	992
Available-for-sale, 12 months or more - Gross unrealized losses	2	0
Available-for-sale, 12 months or more - Estimated fair value	122	9
Available-for-sale, Total - Gross unrealized losses	5	28
Available-for-sale, Total - Estimated fair value	443	1,001
Agency Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	3	9
Available-for-sale, Less than 12 months - Estimated fair value	576	950
Available-for-sale, 12 months or more - Gross unrealized losses	1	0
Available-for-sale, 12 months or more - Estimated fair value	331	127
Available-for-sale, Total - Gross unrealized losses	4	9
Available-for-sale, Total - Estimated fair value	907	1,077
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	74	102
Available-for-sale, Less than 12 months - Estimated fair value	6,266	6,649
Available-for-sale, 12 months or more - Gross unrealized losses	12	7
Available-for-sale, 12 months or more - Estimated fair value	677	326
Available-for-sale, Total - Gross unrealized losses	86	109
Available-for-sale, Total - Estimated fair value	6,943	6,975
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	1	3
Available-for-sale, Less than 12 months - Estimated fair value	149	527
Available-for-sale, 12 months or more - Gross unrealized losses	8	16
Available-for-sale, 12 months or more - Estimated fair value	749	841
Available-for-sale, Total - Gross unrealized losses	9	19
Available-for-sale, Total - Estimated fair value	898	1,368
Available-for-sale, Unrealized losses, Other [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	0	0
Available-for-sale, Less than 12 months - Estimated fair value	0	0
Available-for-sale, 12 months or more - Gross unrealized losses	0	2
Available-for-sale, 12 months or more - Estimated fair value	0	14
Available-for-sale, Total - Gross unrealized losses	0	2
Available-for-sale, Total - Estimated fair value	0	14
Available-for-sale Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	81	142
Available-for-sale, Less than 12 months - Estimated fair value	7,312	9,118
Available-for-sale, 12 months or more - Gross unrealized losses	23	25
Available-for-sale, 12 months or more - Estimated fair value	1,879	1,317
Available-for-sale, Total - Gross unrealized losses	104	167
Available-for-sale, Total - Estimated fair value	$ 9,191	$ 10,435

XML

Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments [Abstract]
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	$ 5	$ 8	$ 20	$ 15
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	0	0	7	4
Gain (Loss) on Investments	$ 5	$ 8	$ 13	$ 11

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Investment Securities Taxable and Nontaxable Interest Income by Investment Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Noninterest Income	$ 84	$ 49	$ 246	$ 143
Taxable [Member]
Noninterest Income	75	43	218	126
Nontaxable [Member]
Noninterest Income	9	6	28	17
Held-to-maturity Securities [Member]
Noninterest Income	5	5	17	16
Held-to-maturity Securities [Member] | Taxable [Member]
Noninterest Income	2	2	7	7
Held-to-maturity Securities [Member] | Nontaxable [Member]
Noninterest Income	3	3	10	9
Available-for-sale Securities [Member]
Noninterest Income	78	43	227	126
Available-for-sale Securities [Member] | Taxable [Member]
Noninterest Income	72	40	209	118
Available-for-sale Securities [Member] | Nontaxable [Member]
Noninterest Income	6	3	18	8
Trading Securities [Member]
Noninterest Income	1	1	2	1
Trading Securities [Member] | Taxable [Member]
Noninterest Income	1	1	2	1
Trading Securities [Member] | Nontaxable [Member]
Noninterest Income	$ 0	$ 0	$ 0	$ 0

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Investment Securities Noncredit impairment recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Noncredit related impairment losses [Line Items]
Investment Income, Interest	$ 84	$ 49	$ 246	$ 143
Trading Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	1	1	2	1
Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	78	43	227	126
Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	5	5	17	16
Taxable [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	75	43	218	126
Taxable [Member] | Trading Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	1	1	2	1
Taxable [Member] | Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	72	40	209	118
Taxable [Member] | Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	2	2	7	7
Nontaxable [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	9	6	28	17
Nontaxable [Member] | Trading Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	0	0	0	0
Nontaxable [Member] | Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	6	3	18	8
Nontaxable [Member] | Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	$ 3	$ 3	$ 10	$ 9

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Loans And Allowance For Credit Losses (Narrative) (Details) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) d	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Loans And Allowance For Credit Losses [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses			$ 1
Unfunded Lending Commitments on Troubled Debt Restructuring		$ 18		$ 18				$ 14
Loans and Leases Receivable, Gross		44,156		44,156				42,649
Financing Receivable, Recorded Investment, Current		43,840		43,840				42,340
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	7	2	$ 7	$ 84	$ 139
Unearned income and fees, net of related costs		63		63				77
Owner occupied and commercial real estate loans, unamortized premiums		17		17				20
Land Development Loans		238		238				290
Loans at carrying value pledged as collateral for current and potential borrowings		25,400		25,400				24,000
Payments for Origination and Purchases of Loans Held-for-sale		176	387	640	979
Principal Balance of Loans Sold, Serviced Loans		2,100		2,100				2,000
Loans and Leases Receivable, Gain (Loss) on Sales, Net		1	6	9	15
Principle amount of loans held for sale sold		146	413	$ 696	1,004
Minimum number of days past due for nonaccrual status | d				90
Recorded investment in TDR loans modified with interest rates below market		116		$ 116				128
Additional interest income due to increased cash flows from acquired loans		2	4	15	14
Provision for Loan and Lease Losses		5	19	35	95
Provision for Unfunded Lending Commitments		(4)	(3)	(6)	(13)
Other Real Estate, Foreclosed Assets, and Repossessed Assets		1		1				2
Other Real Estate, In Process of Forecloseing Assets		7		7				10
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		122		122				150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		194		194				159
Financing Receivable, Recorded Investment, Past Due		316		316				309
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		30		30				36
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	265		265				381
Total reversal amount to allowance for loan and lease losses due to an increased cash flows from acquired loans		0	1	0	1
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		22,539		$ 22,539				21,615
Subsequent payment default period, number of days | d				90
Provision for Loan and Lease Losses		(4)	22	$ 27	93
Provision for Unfunded Lending Commitments		(4)	(2)	(5)	(6)
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		10,503		$ 10,503				9,693
Subsequent payment default period, number of days | d				60
Provision for Loan and Lease Losses		16	3	$ 23	(3)
Provision for Unfunded Lending Commitments		0	0	0	(1)
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1				0
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		10,503		10,503				9,693
Financing Receivable, Recorded Investment, Current		10,450		10,450				9,638
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		28		28				22
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25				33
Financing Receivable, Recorded Investment, Past Due		53		53				55
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5		5				5
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	26		26				17
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		188		188				190
Financing Receivable, Recorded Investment, Current		185		185				189
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3		3				1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0				0
Financing Receivable, Recorded Investment, Past Due		3		3				1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1				0
Finance Leases Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		343		343				423
Financing Receivable, Recorded Investment, Current		343		343				423
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0				0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0				0
Financing Receivable, Recorded Investment, Past Due		0		0				0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	8		8				14
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		7,082		7,082				6,962
Financing Receivable, Recorded Investment, Current		7,021		7,021				6,894
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		27		27				40
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		34		34				28
Financing Receivable, Recorded Investment, Past Due		61		61				68
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5		5				8
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	49		49				43
Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		1,073		1,073				778
Financing Receivable, Recorded Investment, Current		1,073		1,073				778
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0				0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0				0
Financing Receivable, Recorded Investment, Past Due		0		0				0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1				1
Commercial Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		22,539		22,539				21,615
Financing Receivable, Recorded Investment, Current		22,307		22,307				21,401
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		80		80				112
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		152		152				102
Financing Receivable, Recorded Investment, Past Due		232		232				214
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		22		22				18
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	208		208				345
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,170		2,170				2,019
Financing Receivable, Recorded Investment, Current		2,158		2,158				2,010
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6		6				7
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		6		6				2
Financing Receivable, Recorded Investment, Past Due		12		12				9
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1				1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1				1
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		8,944		8,944				9,322
Financing Receivable, Recorded Investment, Current		8,925		8,925				9,291
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		8		8				9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		11		11				22
Financing Receivable, Recorded Investment, Past Due		19		19				31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		2		2				12
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	30		30				18
Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,114		11,114				11,341
Financing Receivable, Recorded Investment, Current		11,083		11,083				11,301
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		14		14				16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		17		17				24
Financing Receivable, Recorded Investment, Past Due		31		31				40
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3				13
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	31		31				19
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,745		2,745				2,645
Financing Receivable, Recorded Investment, Current		2,735		2,735				2,635
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6		6				4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		4		4				6
Financing Receivable, Recorded Investment, Past Due		10		10				10
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	4		4				5
One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		6,522		6,522				5,891
Financing Receivable, Recorded Investment, Current		6,497		6,497				5,857
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10		10				12
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		15		15				22
Financing Receivable, Recorded Investment, Past Due		25		25				34
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	20		20				11
Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		558		558				486
Financing Receivable, Recorded Investment, Current		547		547				479
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6		6				3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		5		5				4
Financing Receivable, Recorded Investment, Past Due		11		11				7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		4		4				3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0				0
Revolving Credit Facility [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		490		490				481
Financing Receivable, Recorded Investment, Current		486		486				478
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3		3				2
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		1		1				1
Financing Receivable, Recorded Investment, Past Due		4		4				3
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1				1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1				1
Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		133		133				151
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	0	4
Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		248		248				251
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	$ 3	2	$ 3
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 10		$ 10				$ 12

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

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Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	$ 541	$ 597	$ 541	$ 597
Loans held for sale	71		71			$ 172
Commercial and industrial	14,041		14,041			13,452
Leasing	343		343			423
Owner occupied	7,082		7,082			6,962
Municipal	1,073		1,073			778
Construction and land development	2,170		2,170			2,019
Term	8,944		8,944			9,322
Provision for loan losses	(5)	(19)	(35)	(95)
Allowance for Loan and Lease Losses, Write-offs	(25)	(54)	(117)	(159)
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	17	24	56	55
Net loan and lease charge-offs	(8)	(30)	(61)	(104)
Reserve for unfunded lending commitments	59	62	59	62	$ 63	65	$ 65	$ 75
Provision for Unfunded Lending Commitments	(4)	(3)	(6)	(13)
Total allowance for credit losses	600	$ 659	600	$ 659
Loans Receivable, Gross, Commercial, Real Estate	11,114		11,114			11,341
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,745		2,745			2,645
Loans and Leases Receivable, Gross, Consumer, Mortgage	6,522		6,522			5,891
Loans and Leases Receivable, Gross, Consumer, Construction	558		558			486
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	490		490			481
Loans and Leases Receivable, Gross, Consumer, Other	188		188			190
Loans and Leases Receivable, Gross	44,156		44,156			42,649
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	22,539		22,539			21,615
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	$ 10,503		$ 10,503			$ 9,693

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Loans And Allowance For Credit Losses (Summary Of Changes In The Allowance For Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	$ (5)	$ (19)	$ (35)	$ (95)
Allowance for Loan and Lease Losses, Write-offs	(25)	(54)	(117)	(159)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	544	608	567	606
Allowance for Loan and Lease Losses, Adjustments, Other	(8)	(30)	(61)	(104)
Balance at end of period	59	62	59	62
Allowance for loan losses	544	608	567	606	$ 541	$ 544	$ 567	$ 597	$ 608	$ 606
Reserve for unfunded lending commitments	59	62	59	62	59	63	65	62	65	75
Total allowance for credit losses					600			659
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	17	24	56	55
Provision for Unfunded Lending Commitments	(4)	(3)	(6)	(13)
Balance at end of period	541	597	541	597
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	4	(22)	(27)	(93)
Allowance for Loan and Lease Losses, Write-offs	(16)	(48)	(98)	(137)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	393	457	420	454
Allowance for Loan and Lease Losses, Adjustments, Other	(4)	(33)	(62)	(101)
Balance at end of period	49	52	49	52
Allowance for loan losses	393	457	420	454	385	393	420	446	457	454
Reserve for unfunded lending commitments	49	52	49	52	49	53	54	52	54	58
Total allowance for credit losses					434			498
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	12	15	36	36
Provision for Unfunded Lending Commitments	(4)	(2)	(5)	(6)
Balance at end of period	385	446	385	446
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	7	6	15	(5)
Allowance for Loan and Lease Losses, Write-offs	(4)	(1)	(6)	(10)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	116	121	116	114
Allowance for Loan and Lease Losses, Adjustments, Other	(2)	6	6	2
Balance at end of period	10	10	10	10
Allowance for loan losses	116	121	116	114	107	116	116	121	121	114
Reserve for unfunded lending commitments	10	10	10	10	10	10	11	10	11	16
Total allowance for credit losses					117			131
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	2	7	12	12
Provision for Unfunded Lending Commitments	0	(1)	(1)	(6)
Balance at end of period	107	121	107	121
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(16)	(3)	(23)	3
Allowance for Loan and Lease Losses, Write-offs	(5)	(5)	(13)	(12)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	35	30	31	38
Allowance for Loan and Lease Losses, Adjustments, Other	(2)	(3)	(5)	(5)
Balance at end of period	0	0	0	0
Allowance for loan losses	35	30	31	38	49	35	31	30	30	38
Reserve for unfunded lending commitments	0	0	0	0	0	$ 0	$ 0	0	$ 0	$ 1
Total allowance for credit losses					$ 49			$ 30
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3	2	8	7
Provision for Unfunded Lending Commitments	0	0	0	(1)
Balance at end of period	$ 49	$ 30	$ 49	$ 30

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Loans And Allowance For Credit Losses (Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 601	$ 724	$ 559	$ 599
Impaired Financing Receivable, Interest Income, Accrual Method	5	8	23	26
Allowance for loan losses: Individually evaluated for impairment	(33)		(33)			$ (65)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	508		508			502
Outstanding loan balances: Individually evaluated for impairment	500		500			619
Outstanding loan balances: Collectively evaluated for impairment	43,616		43,616			41,953
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	40		40			77
Loans and Leases Receivable, Gross	44,156		44,156			42,649
Financing Receivable Allowance For Credit Losses and Receivables Acquired With Deteriorated Credit Quality	0		0			0
Loans and Leases Receivable, Allowance	541	597	541	597	$ 544	567	$ 608	$ 606
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	104	100	101	103
Impaired Financing Receivable, Interest Income, Accrual Method	2	2	5	8
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(28)		(28)			(56)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	357		357			364
Outstanding loan balances: Individually evaluated for impairment	352		352			466
Outstanding loan balances: Collectively evaluated for impairment	22,163		22,163			21,111
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	24		24			38
Loans and Leases Receivable, Gross	22,539		22,539			21,615
Financing Receivable Allowance For Credit Losses and Receivables Acquired With Deteriorated Credit Quality	0		0			0
Loans and Leases Receivable, Allowance	385	446	385	446	393	420	457	454
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	10	11	11	12
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	0	2
Loans and Leases Receivable, Allowance	107	121	107	121	116	116	121	114
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1	2	1	2
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment	(4)		(4)			(6)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	45		45			25
Outstanding loan balances: Individually evaluated for impairment	70		70			75
Outstanding loan balances: Collectively evaluated for impairment	10,427		10,427			9,611
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	6		6			7
Loans and Leases Receivable, Gross	10,503		10,503			9,693
Financing Receivable Allowance For Credit Losses and Receivables Acquired With Deteriorated Credit Quality	0		0			0
Loans and Leases Receivable, Allowance	49	30	49	30	$ 35	31	$ 30	$ 38
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	461	550	413	423
Impaired Financing Receivable, Interest Income, Accrual Method	3	3	10	12
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	53	74	58	79
Impaired Financing Receivable, Interest Income, Accrual Method	1	3	11	9
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	63	85	69	91
Impaired Financing Receivable, Interest Income, Accrual Method	1	4	11	11
Allowance for loan losses: Individually evaluated for impairment	(1)		(1)			(3)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	106		106			113
Outstanding loan balances: Individually evaluated for impairment	78		78			78
Outstanding loan balances: Collectively evaluated for impairment	11,026		11,026			11,231
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	10		10			32
Loans and Leases Receivable, Gross	11,114		11,114			11,341
Financing Receivable Allowance For Credit Losses and Receivables Acquired With Deteriorated Credit Quality	0		0			0
Loans and Leases Receivable, Allowance	107		107			$ 116
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	21	23	21	22
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	1	1
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	53	61	53	58
Impaired Financing Receivable, Interest Income, Accrual Method	1	1	1	2
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2	3	2	3
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	77	89	77	85
Impaired Financing Receivable, Interest Income, Accrual Method	1	1	2	3
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1	1	1	1
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 0

XML

Loans And Allowance For Credit Losses (Summary Of Nonaccrual Loans) (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	[1]	$ 265	$ 381
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		13	40
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		6	7
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		1	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		8	14
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		85	74
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		1	1
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		351	443
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		41	29
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		47	36
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		11	11
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		40	36
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		1	2
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		1	1
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		54	50
Financing Receivables, Total [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		452	529
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		$ 257	$ 354

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

XML

Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 1	$ 7	$ 2	$ 7	$ 84	$ 139
Financing Receivable, Recorded Investment, Current		43,840		43,840				$ 42,340
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		122		122				150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		194		194				159
Total past due		316		316				309
Loans and Leases Receivable, Gross		44,156		44,156				42,649
Accruing loans 90+ days past due		30		30				36
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	265		265				381
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	3	1	3
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		22,539		22,539				21,615
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	7	2	7
Financing Receivable, Recorded Investment, Nonaccrual Status		351		351				443
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		6		6				7
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		10,503		10,503				9,693
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1				0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		54		54				50
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		8		8				14
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	1	4
Financing Receivable, Recorded Investment, Nonaccrual Status		85		85				74
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1				1
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		41		41				29
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,114		11,114				11,341
Financing Receivable, Recorded Investment, Nonaccrual Status		47		47				36
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		11		11				11
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		40		40				36
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1				2
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1				$ 1
Accruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	0	4
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	0	4
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	0	4
Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	3	2	3
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	3	1	3
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	3	2	3
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 0	$ 0	$ 1	$ 0

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

XML

Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 1	$ 7	$ 2	$ 7	$ 84	$ 139
Financing Receivable, Recorded Investment, Current		43,840		43,840				$ 42,340
Loans held for sale		71		71				172
Commercial and industrial		14,041		14,041				13,452
Leasing		343		343				423
Owner occupied		7,082		7,082				6,962
Municipal		1,073		1,073				778
Construction and land development		2,170		2,170				2,019
Term		8,944		8,944				9,322
Loans Receivable, Gross, Commercial, Real Estate		11,114		11,114				11,341
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,745		2,745				2,645
1-4 family residential		6,522		6,522				5,891
Loans and Leases Receivable, Gross, Consumer, Construction		558		558				486
Bankcard and other revolving plans		490		490				481
Other		188		188				190
Loans and Leases Receivable, Gross		44,156		44,156				42,649
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		122		122				150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		194		194				159
Financing Receivable, Recorded Investment, Past Due		316		316				309
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		30		30				36
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	265		265				381
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		10,503		10,503				9,693
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,745		2,745				2,645
1-4 family residential		6,522		6,522				5,891
Loans and Leases Receivable, Gross, Consumer, Construction		558		558				486
Bankcard and other revolving plans		490		490				481
Other		188		188				190
Loans and Leases Receivable, Gross		10,503		10,503				9,693
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1				0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development		2,170		2,170				2,019
Term		8,944		8,944				9,322
Loans Receivable, Gross, Commercial, Real Estate		11,114		11,114				11,341
Financing Receivable, Recorded Investment, Nonaccrual Status		6		6				7
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		14,041		14,041				13,452
Leasing		343		343				423
Owner occupied		7,082		7,082				6,962
Municipal		1,073		1,073				778
Loans and Leases Receivable, before Fees, Gross		22,539		22,539				21,615
Loans and Leases Receivable, Gross		22,539		22,539				21,615
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		42,349		42,349				40,564
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		10,431		10,431				9,629
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,728		2,728				2,629
1-4 family residential		6,475		6,475				5,851
Loans and Leases Receivable, Gross, Consumer, Construction		554		554				482
Bankcard and other revolving plans		487		487				478
Other		187		187				189
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development		2,140		2,140				1,942
Term		8,697		8,697				9,096
Loans Receivable, Gross, Commercial, Real Estate		10,837		10,837				11,038
Pass [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		12,987		12,987				12,185
Leasing		325		325				387
Owner occupied		6,697		6,697				6,560
Municipal		1,072		1,072				765
Loans and Leases Receivable, before Fees, Gross		21,081		21,081				19,897
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		559		559				508
Special Mention [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0				0
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0				0
1-4 family residential		0		0				0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0				0
Bankcard and other revolving plans		0		0				0
Other		0		0				0
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development		24		24				52
Term		84		84				82
Loans Receivable, Gross, Commercial, Real Estate		108		108				134
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		357		357				266
Leasing		1		1				5
Owner occupied		93		93				96
Municipal		0		0				7
Loans and Leases Receivable, before Fees, Gross		451		451				374
Total Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		541		541				567
Total Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		49		49				31
Total Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		107		107				116
Total Allowance [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		385		385				420
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2		2				4
Doubtful [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0				0
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0				0
1-4 family residential		0		0				0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0				0
Bankcard and other revolving plans		0		0				0
Other		0		0				0
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development		0		0				0
Term		0		0				0
Loans Receivable, Gross, Commercial, Real Estate		0		0				0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		2		2				3
Leasing		0		0				1
Owner occupied		0		0				0
Municipal		0		0				0
Loans and Leases Receivable, before Fees, Gross		2		2				4
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		1,246		1,246				1,573
Substandard [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		72		72				64
Loans and Leases Receivable, Gross, Consumer, Home Equity		17		17				16
1-4 family residential		47		47				40
Loans and Leases Receivable, Gross, Consumer, Construction		4		4				4
Bankcard and other revolving plans		3		3				3
Other		1		1				1
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Construction and land development		6		6				25
Term		163		163				144
Loans Receivable, Gross, Commercial, Real Estate		169		169				169
Substandard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		695		695				998
Leasing		17		17				30
Owner occupied		292		292				306
Municipal		1		1				6
Loans and Leases Receivable, before Fees, Gross		1,005		1,005				1,340
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		58		58				172
Loans and Leases Receivable, Gross		71		71				172
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0				0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		13		13				0
Financing Receivable, Recorded Investment, Past Due		13		13				0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0				40
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		13,870		13,870				13,306
Loans and Leases Receivable, Gross		14,041		14,041				13,452
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		53		53				72
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		118		118				74
Financing Receivable, Recorded Investment, Past Due		171		171				146
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		17		17				10
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	150		150				287
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		10,450		10,450				9,638
Loans and Leases Receivable, Gross		10,503		10,503				9,693
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		28		28				22
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25				33
Financing Receivable, Recorded Investment, Past Due		53		53				55
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5		5				5
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	26		26				17
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		185		185				189
Loans and Leases Receivable, Gross		188		188				190
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3		3				1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0				0
Financing Receivable, Recorded Investment, Past Due		3		3				1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1				0
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		8,925		8,925				9,291
Loans and Leases Receivable, Gross		8,944		8,944				9,322
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		8		8				9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		11		11				22
Financing Receivable, Recorded Investment, Past Due		19		19				31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		2		2				12
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	30		30				18
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,158		2,158				2,010
Loans and Leases Receivable, Gross		2,170		2,170				2,019
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6		6				7
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		6		6				2
Financing Receivable, Recorded Investment, Past Due		12		12				9
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1				1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1				1
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		343		343				423
Loans and Leases Receivable, Gross		343		343				423
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0				0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0				0
Financing Receivable, Recorded Investment, Past Due		0		0				0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	8		8				14
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,021		7,021				6,894
Loans and Leases Receivable, Gross		7,082		7,082				6,962
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		27		27				40
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		34		34				28
Financing Receivable, Recorded Investment, Past Due		61		61				68
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5		5				8
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	49		49				43
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		1,073		1,073				778
Loans and Leases Receivable, Gross		1,073		1,073				778
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0				0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0				0
Financing Receivable, Recorded Investment, Past Due		0		0				0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1				1
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,083		11,083				11,301
Loans and Leases Receivable, Gross		11,114		11,114				11,341
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		14		14				16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		17		17				24
Financing Receivable, Recorded Investment, Past Due		31		31				40
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3				13
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	31		31				19
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,735		2,735				2,635
Loans and Leases Receivable, Gross		2,745		2,745				2,645
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6		6				4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		4		4				6
Financing Receivable, Recorded Investment, Past Due		10		10				10
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	4		4				5
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		22,307		22,307				21,401
Loans and Leases Receivable, Gross		22,539		22,539				21,615
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		80		80				112
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		152		152				102
Financing Receivable, Recorded Investment, Past Due		232		232				214
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		22		22				18
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	208		208				345
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		6,497		6,497				5,857
Loans and Leases Receivable, Gross		6,522		6,522				5,891
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10		10				12
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		15		15				22
Financing Receivable, Recorded Investment, Past Due		25		25				34
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0				0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	20		20				11
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		547		547				479
Loans and Leases Receivable, Gross		558		558				486
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6		6				3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		5		5				4
Financing Receivable, Recorded Investment, Past Due		11		11				7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		4		4				3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0				0
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 257		$ 257				$ 354

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

XML

Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,745		$ 2,745		$ 2,645
Unpaid principal balance	597		597		788
Recorded investment	515		515		660
Impaired Financing Receivable, Related Allowance	32		32		63
Average recorded investment	601	$ 724	559	$ 599
Interest income recognized	5	8	23	26
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	117		117		115
Recorded investment	103		103		101
Impaired Financing Receivable, Related Allowance	3		3		3
Average recorded investment	104	100	101	103
Interest income recognized	2	2	5	8
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1		1		1
Recorded investment	1		1		1
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	1	1	1	1
Interest income recognized	0	0	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	431		431		586
Recorded investment	373		373		495
Impaired Financing Receivable, Related Allowance	28		28		55
Average recorded investment	461	550	413	423
Interest income recognized	3	3	10	12
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	10		10		22
Recorded investment	9		9		13
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	10	11	11	12
Interest income recognized	0	1	0	2
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	67		67		92
Recorded investment	57		57		70
Impaired Financing Receivable, Related Allowance	0		0		2
Average recorded investment	53	74	58	79
Interest income recognized	1	3	11	9
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	77		77		114
Recorded investment	66		66		83
Impaired Financing Receivable, Related Allowance	0		0		2
Average recorded investment	63	85	69	91
Interest income recognized	1	4	11	11
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	24		24		24
Recorded investment	21		21		23
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	21	23	21	22
Interest income recognized	0	0	1	1
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,745		2,745		2,645
Unpaid principal balance	1		1		2
Recorded investment	1		1		1
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	1	2	1	2
Interest income recognized	0	0	0	0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	61		61		59
Recorded investment	51		51		55
Impaired Financing Receivable, Related Allowance	4		4		6
Average recorded investment	53	61	53	58
Interest income recognized	1	1	1	2
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3		3		3
Recorded investment	3		3		3
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	2	3	2	3
Interest income recognized	0	0	0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	89		89		88
Recorded investment	76		76		82
Impaired Financing Receivable, Related Allowance	4		4		6
Average recorded investment	77	89	77	85
Interest income recognized	1	1	2	3
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	249		249		401
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	39		39		30
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0		0
Impaired Financing Receivable Related Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	199		199		341
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	4		4		6
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	12		12		17
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	16		16		23
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	8		8		7
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	0		0		0
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	25		25		28
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1		1		2
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	34		34		37
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	266		266		259
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	64		64		71
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1		1		1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	174		174		154
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	5		5		7
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	45		45		53
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	50		50		60
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	13		13		16
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	1		1		1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	26		26		27
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	2		2		1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	42		42		45
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	313		313		470
Recorded investment	269		269		393
Impaired Financing Receivable, Related Allowance	25		25		52
Average recorded investment	356	449	311	319
Interest income recognized	1	$ 1	5	$ 4
Commercial and Industrial Sector [Member] | Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	160		160		311
Commercial and Industrial Sector [Member] | Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment	$ 109		$ 109		$ 82

XML

Loans And Allowance For Credit Losses (Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 1	$ 7	$ 2	$ 7	$ 84	$ 139
1-4 family residential		6,522		6,522				$ 5,891
Construction and other consumer real estate		558		558				486
Commercial and industrial		14,041		14,041				13,452
Home equity credit line		2,745		2,745				2,645
Bankcard and other revolving plans		490		490				481
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	3	1	3
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	1	4
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	7	2	7
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		6,522		6,522				5,891
Construction and other consumer real estate		558		558				486
Home equity credit line		2,745		2,745				2,645
Bankcard and other revolving plans		490		490				481
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	0	4
Recorded investment resulting from the following modification types		133		133				151
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Commercial and industrial		38		38				47
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	0	4
Recorded investment resulting from the following modification types		23		23				22
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	4	0	4
Recorded investment resulting from the following modification types		61		61				69
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4				8
Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		14		14				17
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		18		18				25
Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		15		15				14
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		37		37				42
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		2		2				1
Accruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		54		54				57
Accruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		7		7				10
Accruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0				0
Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2				3
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2				3
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4				4
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4				4
Accruing [Member] | Interest Rate Below Market [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0				0
Accruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		1		1				3
Accruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0				0
Accruing [Member] | Interest Rate Below Market [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				3
Accruing [Member] | Maturity Or Team Extension [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		9		9				25
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		4		4				19
Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4				19
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2				4
Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2				4
Accruing [Member] | Maturity Or Team Extension [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		2		2				1
Accruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0				1
Accruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		1		1				0
Accruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3				2
Accruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		18		18				17
Accruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0				0
Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Accruing [Member] | Principal Forgiveness [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Accruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Principal Forgiveness [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		10		10				10
Accruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		7		7				6
Accruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0				0
Accruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		17		17				16
Accruing [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2				1
Accruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0				0
Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Payment Deferral [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Payment Deferral [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Accruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Accruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Accruing [Member] | Payment Deferral [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0				0
Accruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		1		1				0
Accruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0				0
Accruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	22		22				12
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[1]	11		11				0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	7		7				8
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	18		18				8
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	0		0				0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	2		2				2
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	2		2				2
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[1]	0		0				0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[1]	2		2				2
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	[1]	0		0				0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	2		2				2
Accruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	75		75				86
Accruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[2]	23		23				28
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	13		13				10
Accruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	36		36				38
Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	2		2				4
Accruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	7		7				10
Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	9		9				14
Accruing [Member] | Multiple Modification Types [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[2]	3		3				3
Accruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[2]	26		26				30
Accruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	[2]	1		1				1
Accruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	30		30				34
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	3	2	3
Recorded investment resulting from the following modification types		248		248				251
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	3	1	3
Commercial and industrial		82		82				60
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	0
Recorded investment resulting from the following modification types		14		14				17
Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	$ 3	2	$ 3
Recorded investment resulting from the following modification types		97		97				78
Nonaccruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				2
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		8		8				8
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		8		8				10
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		1		1				2
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		8		8				8
Nonaccruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		1		1				2
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		10		10				12
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		115		115				100
Nonaccruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		10		10				13
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0				1
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2				2
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2				2
Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0				0
Nonaccruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0				0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0				0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3				3
Nonaccruing [Member] | Maturity Or Team Extension [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		14		14				28
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		1		1				0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2				1
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4				2
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				1
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0				0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0				0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0				0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		5		5				3
Nonaccruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		25		25				20
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		4		4				0
Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4				0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		1		1				1
Nonaccruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		2		2				2
Nonaccruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0				0
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3				3
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		7		7				3
Nonaccruing [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		8		8				7
Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		4		4				1
Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				3
Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		5		5				4
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0				0
Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0				0
Nonaccruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		1		1				2
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1				2
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6		6				6
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	71		71				51
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[1]	46		46				33
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1		1				1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	47		47				34
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	0		0				2
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1		1				2
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1		1				4
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[1]	0		0				0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[1]	1		1				1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	[1]	0		0				0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1		1				1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	49		49				39
Nonaccruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	120		120				132
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[2]	27		27				25
Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	9		9				12
Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0				0
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	36		36				37
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	0		0				0
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	4		4				3
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	4		4				3
Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[2]	0		0				1
Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[2]	5		5				5
Nonaccruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	[2]	0		0				0
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	5		5				6
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	$ 45		$ 45				$ 46

[1] 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

[2] 2 Includes TDRs that resulted from a combination of any of the previous modification types.

XML

Loans And Allowance For Credit Losses (Summary Of Net Financial Impact On Interest Income Due To Interest Rate Modifications Below Market For Accruing TDR Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1	$ 7	$ 2	$ 7	$ 84	$ 139
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,745		2,745				$ 2,645
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,745		2,745				$ 2,645
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	4	1	4
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	7	2	7
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	3	2	3
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	1	0
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	3	2	3
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	4	0	4
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	4	0	4
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 4	$ 0	$ 4

XML

Loans And Allowance For Credit Losses (Schedule Of Investment Of Accruing And Nonaccruing Loans Modified As Troubled Debt Restructurings) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1	$ 7	$ 2	$ 7	$ 84	$ 139
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	4	0	4
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	3	2	3
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	3	1	3
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	3	1	3
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	4	1	4
Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	4	0	4
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	1	0
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	7	2	7
Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	4	0	4
Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1	$ 3	$ 2	$ 3

XML

Loans And Allowance For Credit Losses (Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans) (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		$ 316	$ 309
Financing Receivable, Recorded Investment, Current		43,840	42,340
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		122	150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		194	159
Loans and Leases Receivable, Gross		44,156	42,649
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		30	36
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	265	381
Commercial		36	49
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Commercial Real Estate		15	51
Consumer		7	9
Outstanding balance		58	109
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net		40	77
ALLL		0	1
Carrying amount, net		40	76
loans held for sale [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		13	0
Financing Receivable, Recorded Investment, Current		58	172
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0	0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		13	0
Loans and Leases Receivable, Gross		71	172
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0	40
Commercial And Industrial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		171	146
Financing Receivable, Recorded Investment, Current		13,870	13,306
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		53	72
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		118	74
Loans and Leases Receivable, Gross		14,041	13,452
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		17	10
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	150	287
Finance Leases Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	0
Financing Receivable, Recorded Investment, Current		343	423
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0	0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0	0
Loans and Leases Receivable, Gross		343	423
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	8	14
Owner Occupied [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		61	68
Financing Receivable, Recorded Investment, Current		7,021	6,894
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		27	40
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		34	28
Loans and Leases Receivable, Gross		7,082	6,962
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5	8
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	49	43
Municipal [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	0
Financing Receivable, Recorded Investment, Current		1,073	778
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0	0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0	0
Loans and Leases Receivable, Gross		1,073	778
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1	1
Commercial Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		232	214
Financing Receivable, Recorded Investment, Current		22,307	21,401
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		80	112
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		152	102
Loans and Leases Receivable, Gross		22,539	21,615
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		22	18
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	208	345
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		12	9
Financing Receivable, Recorded Investment, Current		2,158	2,010
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6	7
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		6	2
Loans and Leases Receivable, Gross		2,170	2,019
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1	1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1	1
Term [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		19	31
Financing Receivable, Recorded Investment, Current		8,925	9,291
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		8	9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		11	22
Loans and Leases Receivable, Gross		8,944	9,322
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		2	12
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	30	18
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		31	40
Financing Receivable, Recorded Investment, Current		11,083	11,301
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		14	16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		17	24
Loans and Leases Receivable, Gross		11,114	11,341
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3	13
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	31	19
Home Equity Line of Credit [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		10	10
Financing Receivable, Recorded Investment, Current		2,735	2,635
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6	4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		4	6
Loans and Leases Receivable, Gross		2,745	2,645
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	4	5
One Through Four Family Residential [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		25	34
Financing Receivable, Recorded Investment, Current		6,497	5,857
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10	12
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		15	22
Loans and Leases Receivable, Gross		6,522	5,891
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	20	11
Construction And Other Consumer Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		11	7
Financing Receivable, Recorded Investment, Current		547	479
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6	3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		5	4
Loans and Leases Receivable, Gross		558	486
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		4	3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0	0
Revolving Credit Facility [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		4	3
Financing Receivable, Recorded Investment, Current		486	478
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3	2
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		1	1
Loans and Leases Receivable, Gross		490	481
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1	1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1	1
Consumer Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		3	1
Financing Receivable, Recorded Investment, Current		185	189
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3	1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0	0
Loans and Leases Receivable, Gross		188	190
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1	0
Consumer Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		53	55
Financing Receivable, Recorded Investment, Current		10,450	9,638
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		28	22
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25	33
Loans and Leases Receivable, Gross		10,503	9,693
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5	5
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 26	$ 17

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

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Loans And Allowance For Credit Losses (Schedule Of Changes In The Accretable Yield For PCI Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Loans And Allowance For Credit Losses [Abstract]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ (2)	$ (6)	$ (17)	$ (19)
Changes in Accretable Yield [Roll Forward]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	19	34	19	34	$ 21	$ 33	$ 38	$ 40
Disposals and other	0	2	4	4
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	$ 0	$ 0	$ (1)	$ 9

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Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended			12 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2018	Dec. 31, 2016
Derivative [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion								$ 2
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 0		$ (5)		$ 0		$ 23
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0		3		3		9
Fair values of derivative assets reduced (increased) by net credit valuation adjustments	4		7		4		7
Total derivatives, Notional amount	6,221				6,221				$ 6,209
Cash collateral pledged for derivative liabilities	46				46
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch	1				1
Derivative Instrument, Noninterest Income (Expense)	8		8		19		16
Derivatives Designated As Hedging Instrument Offset To Interest Expense	0		0		0		0
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities	1				1				0
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0		(5)		0		23
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	[1]	3	[1]	3	[1]	9
Total derivatives, Notional amount	1,138				1,138				1,388
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount	5,083				5,083				4,821
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Total derivatives, Notional amount	205				205				235
Derivative Instrument, Noninterest Income (Expense)	0		1		(1)		3
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount	4,598				4,598				4,162
Derivative Instrument, Noninterest Income (Expense)	4		4		8		5
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Total derivatives, Notional amount	280				280				424
Derivative Instrument, Noninterest Income (Expense)	4		$ 3		12		$ 8
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	35				35				59
Other Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	0				0				1
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	35				35				58
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	0				0				0
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	30				30				49
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	5				5				9
Other Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Gross amounts recognized	$ 35				$ 35				$ 59

[1] Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2017, we estimate that $2 million will be reclassified from AOCI into interest income.

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Derivative Instruments And Hedging Activities (Schedule Of Notional Amounts And Recorded Gross Fair Values And Related Gain (Loss) Of Derivative Instruments) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Total derivatives, Notional amount	$ 6,221				$ 6,221			$ 6,209
Amount of derivative gain (loss), recognized in OCI	0		$ (5)		0		$ 23
Amount of derivative gain (loss), Reclassified from AOCI to interest income	0		3		3		9
Derivatives instruments, Noninterest income (expense)	8		8		19		16
Derivatives designated as hedging instruments, Offset to interest expense	0		0		0		0
Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	43				43			64
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	35				35			59
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Total derivatives, Notional amount	1,138				1,138			1,388
Amount of derivative gain (loss), recognized in OCI	0		(5)		0		23
Amount of derivative gain (loss), Reclassified from AOCI to interest income	0	[1]	3	[1]	3	[1]	9
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	0				0			2
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	0				0			1
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount	5,083				5,083			4,821
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	43				43			62
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	35				35			58
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Total derivatives, Notional amount	280				280			424
Derivatives instruments, Noninterest income (expense)	4		3		12		8
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	6				6			11
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	5				5			9
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Total derivatives, Notional amount	205				205			235
Derivatives instruments, Noninterest income (expense)	0		1		(1)		3
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	1				1			2
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	0				0			0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount	4,598				4,598			4,162
Derivatives instruments, Noninterest income (expense)	4		$ 4		8		$ 5
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	36				36			49
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	$ 30				$ 30			$ 49

[1] Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2017, we estimate that $2 million will be reclassified from AOCI into interest income.

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Debt And Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2017

Jun. 30, 2017

Sep. 30, 2016

Jun. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Dec. 31, 2016

Apr. 25, 2016

Dec. 31, 2015

Debt And Shareholders' Equity [Line Items]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt is summarized as follows:

(In millions)	September 30, 2017		December 31, 2016
Subordinated notes	$	247	$	247
Senior notes	135		287
Capital lease obligations	1		1
Total	$	383	$	535

Subordinated Debt

$ 247,000,000

$ 247,000,000

$ 247,000,000

Other Comprehensive Income (Loss), before Reclassifications, Net of Tax

67,000,000

$ 69,000,000

Stockholders' Equity [Abstract]

Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax

2,000,000

5,000,000

Senior Notes

135,000,000

135,000,000

287,000,000

Capital Lease Obligations

1,000,000

1,000,000

1,000,000

Long-term Debt, Gross

383,000,000

383,000,000

535,000,000

Preferred Stock, Tender Offer

144,000,000

144,000,000

$ 120,000,000

Preferred Stock, Liquidation Preference, Value

$ 119,000,000

Payments for Repurchase of Redeemable Preferred Stock

0

$ 0

126,000,000

144,000,000

126,000,000

Dividends, Preferred Stock, Cash

0.49375

Dividends, Preferred Stock, Cash

3,000,000

Preferred Stock Redemption

$ 0

$ 2,000,000

0

10,000,000

$ (3,000,000)

$ (10,000,000)

Stock Repurchased During Period, Shares

3.0

5.0

1.5

Stock Repurchased and Retired During Period, Value

$ 115,000,000

$ 205,000,000

$ 45,000,000

Treasury Stock Acquired, Average Cost Per Share

$ 45.45

$ 43.72

$ 30.64

Accumulated Other Comprehensive Income (Loss), Net of Tax

$ (57,000,000)

10,000,000

$ (57,000,000)

$ 10,000,000

$ (122,000,000)

$ (54,000,000)

Repayments of Long-term Debt

$ 0

$ 129,000,000

153,000,000

244,000,000

Senior Notes [Member]

Stockholders' Equity [Abstract]

Repayments of Long-term Debt

$ 153,000,000

89,000,000

Senior Debt Obligations [Member]

Stockholders' Equity [Abstract]

Early Repayment of Senior Debt

15,000,000

Medium-term Notes [Member]

Stockholders' Equity [Abstract]

Early Repayment of Senior Debt

$ 11,000,000

SERIES I PREFERRED STOCK [Member]

Stockholders' Equity [Abstract]

Preferred Stock, Liquidation Preference, Value

27,000,000

Series J Preferred Stock [Member]

Stockholders' Equity [Abstract]

Preferred Stock, Liquidation Preference, Value

59,000,000

Series G Preferred Stock [Member]

Stockholders' Equity [Abstract]

Preferred Stock, Liquidation Preference, Value

$ 33,000,000

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Debt And Shareholders' Equity (Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax			$ 40	$ 34
Net Income (Loss) Available to Common Stockholders, Basic	$ 152	$ 117	436	286
Income Tax Expense (Benefit)	83	65	207	166
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			67	69
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2)	(5)
Beginning balance			(122)	(54)
Other comprehensive income (loss)	(8)	(14)	65	64
Ending balance	(57)	10	(57)	10
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax			0	6
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax			0	1
Other Comprehensive Income (Loss), Tax			40	41
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			65	54
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Beginning balance			(93)	(18)
Other comprehensive income (loss)			65	54
Ending balance	(28)	36	(28)	36
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			2	16
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2)	(5)
Beginning balance			2	2
Other comprehensive income (loss)			0	11
Ending balance	2	13	2	13
Accumulated Defined Benefit Plans Adjustment [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Beginning balance			(31)	(38)
Other comprehensive income (loss)			0	(1)
Ending balance	(31)	(39)	(31)	(39)
Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Debt And Shareholders' Equity [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	0	3	3	9
Net Income (Loss) Available to Common Stockholders, Basic	0	2	2	5
Income Tax Expense (Benefit)	$ 0	$ 1	$ 1	$ 4

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Debt And Shareholders' Equity Schedule of Long-Term Debt Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Subordinated Debt	$ 247	$ 247
Senior Notes	135	287
Capital Lease Obligations	1	1
Long-term Debt, Gross	$ 383	$ 535

XML

Debt And Shareholders' Equity JUNIOR SUBORDINATED NOTES (Details) $ in Millions	3 Months Ended
	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Junior Subordinated Notes	$ 129
AMEGY STATUTORY TRUST ONE [Member]
Debt Instrument [Line Items]
Junior Subordinated Notes	$ 51
Coupon Rate	3mL+2.85%
Debt Instrument, Date of First Required Payment	Sep. 17, 2016
AMEGY STATUTORY TRUSTS 3 [Member] [Member]
Debt Instrument [Line Items]
Junior Subordinated Notes	$ 62
Coupon Rate	3mL+1.78%
Debt Instrument, Date of First Required Payment	Sep. 15, 2016
STOCKMEN S STATUTORY TRUST 2 [Member]
Debt Instrument [Line Items]
Junior Subordinated Notes	$ 8
Coupon Rate	3mL+3.15%
Debt Instrument, Date of First Required Payment	Sep. 26, 2016
STOCKMEN S STATUTORY TRUST 3 [Member]
Debt Instrument [Line Items]
Junior Subordinated Notes	$ 8
Coupon Rate	3mL+2.89%
Debt Instrument, Date of First Required Payment	Sep. 17, 2016

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Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details) $ in Millions	Sep. 30, 2017 USD ($)
Guarantor Obligations [Line Items]
Letters of credit, accrued liability	$ 5
Reserve for unfunded lending commitments	1
Deferred commitment fees	4
Commitments for Private Equity and Other Noninterest-bearing Investments	27
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	4
Minimum [Member]
Guarantor Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Maximum [Member]
Guarantor Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 20

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Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Unused Commitments to Extend Credit	$ 18,828	$ 18,274
Commercial Letters Of Credit	43	60
Total Unfunded Lending Commitments	19,782	19,301
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	709	771
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	202	$ 196
Minimum [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Maximum [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 20

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Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2	$ 2	$ 5	$ 5
Expected return on plan assets	(3)	(3)	(9)	(9)
Amortization of net actuarial (gain) loss	1	1	4	5
Net periodic benefit cost (credit)	1	3	2	4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 1	$ 3	$ 2	$ 3

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	34.20%		33.90%	30.60%	33.30%
Current State and Local Tax Expense (Benefit)	$ 4	$ 14
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	8			$ 8
Deferred Tax Assets, Net	207			207		$ 250
Operating Loss Carryforwards, Valuation Allowance	$ 4			$ 4

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Operating Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) Branches	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Branches	Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 522	$ 469	$ 1,539	$ 1,386
Provision for Loan and Lease Losses	5	19	35	95
Interest Income (Expense), after Provision for Loan Loss	517	450	1,504	1,291
Noninterest Income, Other Operating Income	3	2	3	1
Noninterest Expense	413	403	1,232	1,181
Income (Loss) from Continuing Operations before Income Taxes, Domestic	243	192	676	498
Zions Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	164	157	483	462
Provision for Loan and Lease Losses	(15)	(1)	18	(31)
Interest Income (Expense), after Provision for Loan Loss	179	158	465	493
Noninterest Income, Other Operating Income	39	39	112	112
Noninterest Expense	107	108	327	320
Income (Loss) from Continuing Operations before Income Taxes, Domestic	111	89	250	285
Average Loans And Leases	12,543	12,629	12,505	12,512
Average Deposits	15,773	15,948	16,001	15,866
Amegy [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	122	114	359	344
Provision for Loan and Lease Losses	33	24	41	159
Interest Income (Expense), after Provision for Loan Loss	89	90	318	185
Noninterest Income, Other Operating Income	28	32	87	90
Noninterest Expense	86	75	259	244
Income (Loss) from Continuing Operations before Income Taxes, Domestic	31	47	146	31
Average Loans And Leases	11,170	10,666	10,890	10,599
Average Deposits	$ 10,862	11,068	$ 11,131	11,100
Number of Branches | Branches	73		73
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 118	110	$ 351	322
Provision for Loan and Lease Losses	(4)	(2)	(10)	(1)
Interest Income (Expense), after Provision for Loan Loss	122	112	361	323
Noninterest Income, Other Operating Income	20	18	56	51
Noninterest Expense	74	75	225	221
Income (Loss) from Continuing Operations before Income Taxes, Domestic	68	55	192	153
Average Loans And Leases	9,575	9,341	9,453	9,170
Average Deposits	$ 11,021	10,929	$ 10,953	10,764
Number of Branches | Branches	92		92
NBA [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 53	48	$ 153	140
Provision for Loan and Lease Losses	(8)	0	(7)	2
Interest Income (Expense), after Provision for Loan Loss	61	48	160	138
Noninterest Income, Other Operating Income	10	11	29	30
Noninterest Expense	38	36	111	109
Income (Loss) from Continuing Operations before Income Taxes, Domestic	33	23	78	59
Average Loans And Leases	4,267	4,156	4,258	4,010
Average Deposits	$ 4,816	4,632	$ 4,747	4,553
Number of Branches | Branches	58		58
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 34	31	$ 98	91
Provision for Loan and Lease Losses	(3)	(4)	(8)	(29)
Interest Income (Expense), after Provision for Loan Loss	37	35	106	120
Noninterest Income, Other Operating Income	11	10	30	29
Noninterest Expense	35	34	105	104
Income (Loss) from Continuing Operations before Income Taxes, Domestic	13	11	31	45
Average Loans And Leases	2,347	2,288	2,352	2,275
Average Deposits	$ 4,276	4,223	$ 4,240	4,113
Number of Branches | Branches	50		50
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 32	31	$ 93	90
Provision for Loan and Lease Losses	0	2	0	(4)
Interest Income (Expense), after Provision for Loan Loss	32	29	93	94
Noninterest Income, Other Operating Income	7	6	19	17
Noninterest Expense	25	25	75	73
Income (Loss) from Continuing Operations before Income Taxes, Domestic	14	10	37	38
Average Loans And Leases	2,683	2,489	2,607	2,453
Average Deposits	2,757	2,663	2,758	2,704
TCBW [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	12	10	34	28
Provision for Loan and Lease Losses	3	0	2	0
Interest Income (Expense), after Provision for Loan Loss	9	10	32	28
Noninterest Income, Other Operating Income	1	1	3	3
Noninterest Expense	5	5	16	15
Income (Loss) from Continuing Operations before Income Taxes, Domestic	5	6	19	16
Average Loans And Leases	939	796	909	769
Average Deposits	1,098	1,010	1,098	970
Other Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	(13)	(32)	(32)	(91)
Provision for Loan and Lease Losses	(1)	0	(1)	(1)
Interest Income (Expense), after Provision for Loan Loss	(12)	(32)	(31)	(90)
Noninterest Income, Other Operating Income	23	28	68	56
Noninterest Expense	43	45	114	95
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(32)	(49)	(77)	(129)
Average Loans And Leases	308	122	244	80
Average Deposits	$ 1,318	202	$ 1,227	(8)
Utah [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	98		98
Idaho [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	23		23
WYOMING | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
Colorado [Member] | Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	36		36
New Mexico [Member] | Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
WASHINGTON | TCBW [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
OREGON | TCBW [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 522	469	$ 1,539	1,386
Provision for Loan and Lease Losses	5	19	35	95
Interest Income (Expense), after Provision for Loan Loss	517	450	1,504	1,291
Noninterest Income, Other Operating Income	139	145	404	388
Noninterest Expense	413	403	1,232	1,181
Income (Loss) from Continuing Operations before Income Taxes, Domestic	243	192	676	498
Average Loans And Leases	43,832	42,487	43,218	41,868
Average Deposits	$ 51,921	$ 50,675	$ 52,155	$ 50,062