10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2013

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File Number: 1-15081

UnionBanCal Corporation

(Exact name of registrant as specified in its charter)

Delaware	94-1234979
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
400 California Street, San Francisco, California	94104-1302
(Address of principal executive offices)	(Zip Code)

(415) 765-2969

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ    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  þ    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  ¨		Accelerated filer  ¨
Non-accelerated filer  þ	(Do not check if a smaller reporting company)	Smaller reporting company  ¨

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

Number of shares of Common Stock outstanding at April 30, 2013: 136,330,830

THE REGISTRANT MEETS THE CONDITIONS SET FORTH IN GENERAL INSTRUCTION H (1) (a) AND (b) OF FORM 10-Q AND IS THEREFORE FILING THIS FORM WITH THE REDUCED DISCLOSURE FORMAT.

UnionBanCal Corporation and Subsidiaries

Table of Contents

PART I. FINANCIAL INFORMATION	35
Item 1. Financial Statements	35
Consolidated Statements of Income (Unaudited)	35
Consolidated Statements of Comprehensive Income (Unaudited)	36
Consolidated Balance Sheets (Unaudited)	37
Consolidated Statements of Changes in Stockholder’s Equity (Unaudited)	38
Consolidated Statements of Cash Flows (Unaudited)	39
Note 1—Summary of Significant Accounting Policies and Nature of Operations	40
Note 2—Business Combinations	41
Note 3—Securities	42
Note 4—Loans and Allowance for Loan Losses	48
Note 5—Variable Interest Entities	57
Note 6—Employee Pension and Other Postretirement Benefits	58
Note 7—Commercial Paper and Other Short-Term Borrowings	58
Note 8—Long-Term Debt	59
Note 9—Fair Value Measurement and Fair Value of Financial Instruments	59
Note 10—Derivative Instruments and Other Financial Instruments	66
Note 11—Accumulated Other Comprehensive Loss	71
Note 12—Commitments, Contingencies and Guarantees	72
Note 13—Business Segments	73
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	5
Consolidated Financial Highlights	5
Introduction	7
Executive Overview	7
Financial Performance	9
Balance Sheet Analysis	12
Quantitative and Qualitative Disclosures About Market Risk	20
Liquidity Risk	24
Business Segments	26
Critical Accounting Estimates	32
Item 3. Quantitative and Qualitative Disclosures About Market Risk	34
Item 4. Controls and Procedures	34
PART II. OTHER INFORMATION	76
Item 1. Legal Proceedings	76
Item 1A. Risk Factors	76
Item 6. Exhibits	78
SIGNATURES	79

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NOTE REGARDING FORWARD-LOOKING STATEMENTS

This report includes forward-looking statements, which include expectations for our operations and business and our assumptions for those expectations. Do not rely unduly on forward-looking statements. Actual results might differ significantly compared to our expectations. See Part I, Item 1A. “Risk Factors,” in our 2012 Annual Report on Form 10-K, Part II, Item 1A. “Risk Factors” in this Form 10-Q, and the other risks described in this Form 10-Q and in our 2012 Annual Report on Form 10-K, for factors to be considered when reading any forward-looking statements in this filing.

This report includes forward-looking statements, which are subject to the ‘‘safe harbor’’ created by section 27A of the Securities Act of 1933, as amended, and section 21E of the Securities Exchange Act of 1934, as amended. We may make forward-looking statements in our Securities and Exchange Commission (SEC) filings, press releases, news articles and when we are speaking on behalf of UnionBanCal Corporation. Forward-looking statements can be identified by the fact that they do not relate strictly to historical or current facts. Often, they include the words ‘‘believe,’’ ‘‘expect,’’ ‘‘target,’’ ‘‘anticipate,’’ ‘‘intend,’’ ‘‘plan,’’ ‘‘seek,’’ ‘‘estimate,’’ ‘‘potential,’’ ‘‘project,’’ “forecast,” “outlook,” or words of similar meaning, or future or conditional verbs such as ‘‘will,’’ ‘‘would,’’ ‘‘should,’’ ‘‘could,’’ ‘‘might,’’ or ‘‘may.’’ These forward-looking statements are intended to provide investors with additional information with which they may assess our future potential. All of these forward-looking statements are based on assumptions about an uncertain future and are based on information known to our management at the date of these statements. We do not undertake to update forward-looking statements to reflect facts, circumstances, assumptions or events that occur after the date any forward-looking statements are made.

In this document and other reports to the SEC, for example, we make forward-looking statements, which discuss our expectations about:

• Our business objectives, strategies and initiatives, our organizational structure, the growth of our business, our competitive position and prospects, and the effect of competition on our business and strategies

• Our assessment of significant factors and developments that have affected or may affect our results

• Our assessment of economic conditions and trends and economic and credit cycles, and their impact on our business

• The economic outlook for the California, U.S. and global economies

• The impact of changes in interest rates, our strategy to manage our interest rate risk profile and our outlook for short-term and long-term interest rates and their effect on our net interest margin

• Our sensitivity to and management of market risk, including changes in interest rates, and the economic outlook within specific industries, for the U.S. in general, for particular states in the U.S. including California, Oregon, Texas and Washington, and in foreign countries (including Japan and the Euro-zone)

• Pending and recent legislative and regulatory actions, and future legislative and regulatory developments, including the effects of legislation and other governmental measures, including the monetary policies of the Federal Reserve Board, introduced in response to the 2008-2009 financial crises, the following recession affecting the banking system, financial markets and the U.S. economy, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the Dodd-Frank Act), changes to the Federal Deposit Insurance Corporation’s deposit insurance assessment policies, the effect on and application of foreign laws and regulations to our business and operations, and anticipated fees, costs or other impacts on our business and operations as a result of these developments

• Our strategies and expectations regarding capital levels and liquidity, our funding base, core deposits, our expectations regarding the capital, liquidity and enhanced prudential standards adopted as a result of or under the Dodd-Frank Act and the Basel Committee capital and liquidity standards and proposed regulations by the U.S. federal banking agencies and the effect of the foregoing on our business

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• Regulatory controls and processes and their impact on our business

• The costs and effects of legal actions, investigations, regulatory actions, criminal proceedings or similar matters, our anticipated litigation strategies, our assessment of the timing and ultimate outcome of legal actions, or adverse facts and developments related thereto

• Our allowance for credit losses, including the conditions we consider in determining the unallocated allowance and our portfolio credit quality, risk grade and credit migration trends and loss factors

• Loan portfolio composition and risk grade trends, residential loan delinquency rates compared to the industry average, portfolio credit quality, our strategy regarding troubled debt restructurings (TDRs), and our intent to sell or hold loans we originate

• Our intent to sell or hold, and the likelihood that we would be required to sell, or expectations regarding recovery of the amortized cost basis of, various investment securities and our hedging positions

• Expected rates of return, maturities, yields, loss exposure, growth rates, pension plan strategies, contributions and benefit payments, and projected results

• Tax rates and taxes, the possible effect of changes in taxable profits of the U.S. operations of Mitsubishi UFJ Financial Group, Inc. (MUFG) on our state tax obligations and of expected tax credits or benefits

• Critical accounting policies and estimates, the impact or anticipated impact of recent accounting pronouncements, guidance or changes in accounting principles and future recognition of impairments for the fair value of assets, including goodwill, financial instruments, intangible assets and other assets acquired in our acquisition of Pacific Capital Bancorp, Smartstreet and our April 2010 FDIC-assisted acquisitions

• Decisions to downsize, sell or close units, dissolve subsidiaries, expand our branch network, pursue acquisitions, purchase banking facilities and equipment, or otherwise restructure, reorganize or change our business mix, and their timing and their impact on our business

• Our expectations regarding the impact of acquisitions on our business and results of operations and amounts we expect to collect from the FDIC, or must pay to the FDIC, under loss share agreements

• The impact of changes in our credit rating

• Maintenance of casualty and liability insurance coverage appropriate for our operations

• The relationship between our business and that of The Bank of Tokyo-Mitsubishi UFJ, Ltd. (BTMU) and MUFG, the impact of their credit ratings, operations or prospects on our credit ratings and actions that may or may not be taken by BTMU and MUFG

• Descriptions of assumptions underlying or relating to any of the foregoing

There are numerous risks and uncertainties that could cause actual outcomes and results to differ materially from those discussed in our forward-looking statements. Many of these factors are beyond our ability to control or predict and could have a material adverse effect on our financial condition and results of operations or prospects. Such risks and uncertainties include, but are not limited to, those described or referred to in Part 1, Item 1 “Business” under the captions “Competition” and “Supervision and Regulation” of our Annual Report on Form 10-K and in Item 1A. “Risk Factors” of Part II and Item 2 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of this Form 10-Q.

Readers of this document should not rely unduly on any forward-looking statements, which reflect only our management’s belief as of the date of this report, and should consider all uncertainties and risks disclosed throughout this document and in our other reports to the SEC, including, but not limited to, those discussed below. Any factor described in this report could by itself, or together with one or more other factors, adversely affect our business, future prospects, results of operations or financial condition.

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UnionBanCal Corporation and Subsidiaries

Management’s Discussion and Analysis of Financial Condition and Results of Operations

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Consolidated Financial Highlights

	For the Three Months Ended March 31,						Percent Change
(Dollars in millions)	2013			2012
Results of operations:
Net interest income	$	648		$	641			1	%
Noninterest income		255			214			19
Total revenue		903			855			6
Noninterest expense		713			614			16
Pre-tax, pre-provision income(1)		190			241			(21	)
(Reversal of) provision for loan losses		(3	)		(1	)		(200	)
Income before income taxes and including noncontrolling interests		193			242			(20	)
Income tax expense		50			51			(2	)
Net income including noncontrolling interests		143			191			(25	)
Deduct: Net loss from noncontrolling interests		4			4			—
Net income attributable to UnionBanCal Corporation (UNBC)	$	147		$	195			(25	)
Balance sheet (period average):
Total assets	$	96,649		$	89,449			8	%
Total securities		21,824			24,265			(10	)
Total loans held for investment		60,553			54,149			12
Earning assets		87,055			80,503			8
Total deposits		74,256			64,425			15
UNBC Stockholder’s equity		12,584			11,621			8
Performance Ratios:
Return on average assets(2)		0.61	%		0.88	%
Return on average UNBC stockholder’s equity(2)		4.67			6.75
Efficiency ratio(3)		78.89			71.86
Adjusted efficiency ratio(4)		67.76			68.76
Net interest margin(2)(5)		3.01			3.20
Net loans charged off to average total loans held for investment(2)		0.10			0.40
Net loans charged off to average total loans held for investment, purchased credit-impaired loans and FDIC covered other real estate owned (OREO)(2)(11)		0.08			0.41
	As of
	March 31, 2013			December 31, 2012
Balance sheet (end of period):
Total assets	$	96,959		$	96,992			—	%
Total securities		22,816			22,455			2
Total loans held for investment		60,882			60,034			1
Nonperforming assets		607			616			(1	)
Core deposits(6)		63,585			63,769			—
Total deposits		73,990			74,255			—
Long-term debt		5,314			5,622			(5	)
UNBC Stockholder’s equity		12,594			12,491			1
Capital ratios:
Tier 1 risk-based capital ratio		12.54	%		12.44	%
Total risk-based capital ratio		14.02			13.93
Leverage ratio		10.70			11.18
Tier 1 common capital ratio(7)		12.45			12.35
Tangible common equity ratio(8)		10.05			9.92
Credit Ratios:
Allowance for loan losses to total loans held for investment(9)		1.05	%		1.09	%
Allowance for loan losses to nonaccrual loans(9)		122.62			129.47
Allowance for credit losses to total loans held for investment(10)		1.27			1.28
Allowance for credit losses to nonaccrual loans(10)		149.24			152.67
Nonperforming assets to total loans held for investment and OREO		1.00			1.02
Nonperforming assets to total assets		0.63			0.63
Nonaccrual loans to total loans held for investment		0.85			0.84
Credit ratios, excluding purchased credit-impaired loans and FDIC covered OREO(11):
Allowance for loan losses to total loans held for investment(9)		1.06	%		1.11	%
Allowance for loan losses to nonaccrual loans(9)		129.56			137.40
Allowance for credit losses to total loans held for investment(10)		1.30			1.31
Allowance for credit losses to nonaccrual loans(10)		157.75			162.05
Nonperforming assets to total loans held for investment and OREO		0.87			0.88
Nonperforming assets to total assets		0.54			0.54
Nonaccrual loans to total loans held for investment		0.82			0.81

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⁽¹⁾  Pre-tax, pre-provision income is total revenue less noninterest expense. Management believes that this is a useful financial measure because it enables investors and others to assess the Company’s ability to generate capital to cover loan losses through a credit cycle.

⁽²⁾  Annualized.

⁽³⁾  The efficiency ratio is total noninterest expense as a percentage of total revenue (net interest income and noninterest income).

⁽⁴⁾  The adjusted efficiency ratio, a non-GAAP financial measure, is adjusted noninterest expense (noninterest expense excluding privatization-related expenses and fair value amortization/accretion, foreclosed asset expense and other credit costs, (reversal of) provision for losses on off-balance sheet commitments, low income housing credit (LIHC) investment amortization expense, expenses of the LIHC consolidated variable interest entities (VIEs), merger costs related to acquisitions, certain costs related to productivity initiatives, debt termination fees from balance sheet repositioning and intangible asset amortization) as a percentage of adjusted total revenue (net interest income (taxable-equivalent basis) and noninterest income), excluding the accretion and amortization impact of privatization, gains from productivity initiatives related to the sale of certain business units in 2012, gains from securities associated with debt termination fees from balance sheet repositioning and other credit costs. Management discloses the adjusted efficiency ratio as a measure of the efficiency of our operations, focusing on those costs most relevant to our business activities. Refer to “Noninterest Expense” in this Form 10-Q for further information.

⁽⁵⁾  Amounts are presented on a taxable-equivalent basis using the federal statutory tax rate of 35 percent.

⁽⁶⁾  Core deposits exclude brokered deposits, foreign time deposits and domestic time deposits greater than $250,000.

⁽⁷⁾  The Tier 1 common capital ratio is the ratio of Tier 1 capital, less junior subordinated debt payable to trusts, if any, to risk-weighted assets. The Tier 1 common capital ratio, a non-GAAP financial measure, facilitates the understanding of the Company’s capital structure and is used to assess and compare the quality and composition of the Company’s capital structure to other financial institutions. Refer to “Capital” in this Form 10-Q for further information.

⁽⁸⁾  The tangible common equity ratio, a non-GAAP financial measure, is calculated as tangible common equity divided by tangible assets. The methodology for determining tangible common equity may differ among companies. The tangible common equity ratio facilitates the understanding of the Company’s capital structure and is used to assess and compare the quality and composition of UnionBanCal’s capital structure to other financial institutions. Refer to “Capital” in this Form 10-Q for further information.

⁽⁹⁾  The allowance for loan losses ratios are calculated using the allowance for loan losses against end of period total loans held for investment or total nonaccrual loans, as appropriate.

⁽¹⁰⁾  The allowance for credit losses ratios are calculated using the sum of the allowances for loan losses and for losses on off-balance sheet commitments against end of period total loans held for investment or total nonaccrual loans, as appropriate.

⁽¹¹⁾  These ratios exclude the impact of all purchased credit-impaired loans and FDIC covered OREO. Purchased credit-impaired loans and OREO related to the April 2010 acquisitions of certain assets and assumption of certain liabilities of Frontier Bank and Tamalpais Bank are covered under loss share agreements between Union Bank, N.A. and the Federal Deposit Insurance Corporation. Management believes the exclusion of purchased credit-impaired loans and FDIC covered OREO from certain asset quality ratios that include nonperforming loans, nonperforming assets, net loans charged off, total loans held for investment and the allowance for loan losses or credit losses in the numerator or denominator provides a better perspective into underlying asset quality trends.

6

Please refer to our consolidated financial statements and the Notes to consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2012 (2012 Form 10-K) along with the following discussion and analysis of our consolidated financial condition and results of operations for the period ended March 31, 2013 in this Form 10-Q. Averages, as presented in the following tables, are substantially all based upon daily average balances.

As used in this Form 10-Q, the term “UnionBanCal” or “the Company” and terms such as “we,” “us” and “our” refer to UnionBanCal Corporation, one or more of its consolidated subsidiaries, or to all of them together.

Introduction

We are a California-based financial holding company and bank holding company whose principal subsidiary is Union Bank, N.A. (the Bank). We provide a wide range of financial services to consumers, small businesses, middle-market companies and major corporations, primarily in California, Oregon, Washington, Texas, New York and Illinois, as well as nationally and internationally. We had consolidated assets of $97 billion at March 31, 2013.

References to the privatization transaction in this report refer to the transaction on November 4, 2008, when we became a privately held company. All of our issued and outstanding shares of common stock are owned by BTMU.

Executive Overview

We are providing you with an overview of what we believe are the most significant factors and developments that affected our first quarter 2013 results and that could influence our future results. Further detailed information can be found elsewhere in this Form 10-Q. In addition, we ask that you carefully read this entire document and any other reports that we refer to in this Form 10-Q for more detailed information that will assist your understanding of trends, events and uncertainties that impact us.

Our sources of income are net interest income and noninterest income (collectively “total revenue”). Net interest income is generated predominantly from interest earned from loans, investment securities and other interest-earning assets, less interest incurred on deposits and borrowings. The primary sources of noninterest income are revenues from service charges on deposit accounts, trust and investment management fees, trading account activities and merchant banking fees. In the first quarter of 2013, revenue was comprised of 72 percent net interest income and 28 percent noninterest income. Changes in interest rates, credit quality, economic regulatory trends and the capital markets are primary factors that affect our revenue sources. A summary of our financial results is discussed below.

Our primary sources of liquidity are core deposits, securities and wholesale funding. Core deposits exclude brokered deposits, foreign time deposits and domestic time deposits greater than $250,000. Wholesale funding includes unsecured funds raised from interbank and other sources, both domestic and international, and secured funds raised by selling securities under repurchase agreements and by borrowing from the Federal Home Loan Bank of San Francisco (FHLB). We evaluate and monitor the stability and reliability of our various funding sources to help ensure that we have sufficient liquidity when adverse situations arise.

On December 1, 2012, we completed the purchase of Pacific Capital Bancorp (PCBC), a bank holding company headquartered in Santa Barbara, California. The transaction enhanced our geographic footprint within California’s Central Coast region where PCBC’s principal subsidiary, Santa Barbara Bank & Trust, N.A., conducted its banking activities. Upon completion of the transaction, Union Bank acquired $3.8 billion in loans held for investment and $4.7 billion in deposits. On October 26, 2012, we completed the acquisition of Smartstreet, formerly a division of PNC Bank, N.A., which provides banking services nationwide to homeowners associations and community association management companies. In the

7

transaction, we acquired approximately $1.0 billion in deposits. Accordingly, our first quarter 2013 results reflect the impact of these two acquisitions.

Performance Highlights

In the first quarter of 2013, net income was $147 million, compared with $195 million in the first quarter of 2012. The decrease is primarily due to noninterest expense, which increased to $713 million in the first quarter of 2013, compared with $614 million in the first quarter of 2012. The increase in noninterest expense was primarily due to higher staff expense resulting from the PCBC acquisition and higher pension and health benefits expense. Partially offsetting this increase in noninterest expense was an increase in net interest income and noninterest income. Net interest income was $648 million in the first quarter of 2013, compared with $641 million in the first quarter of 2012, primarily due to loan growth and the PCBC acquisition. The increase in net interest income was tempered by a 19 basis point decline in our net interest margin for the first quarter of 2013. We expect continued pressure on our net interest margin as our balance sheet continues to reprice downward in the current low interest rate environment. Noninterest income was $255 million in the first quarter of 2013, up $41 million, or 19 percent, primarily from gains on the sale of securities due to portfolio rebalancing activities.

The provision for loan losses was a benefit of $3 million for the quarter ended March 31, 2013 compared with a benefit of $1 million for the quarter ended March 31, 2012, reflecting a continuing, but moderating, pace of credit quality improvement within our loan portfolio. Our ratio of nonaccrual loans to total loans held for investment was 0.85 percent at March 31, 2013 and 0.84 percent at December 31, 2012. Our ratio of allowance for loan losses to total loans held for investment decreased to 1.05 percent at March 31, 2013 from 1.09 percent at December 31, 2012. Annualized net loans charged off to average total loans held for investment was 0.10 percent for the quarter ended March 31, 2013 compared with 0.40 percent for the quarter ended March 31, 2012.

Capital Ratios

At March 31, 2013, our regulatory Tier 1 and Total risk-based capital ratios were 12.54 percent and 14.02 percent, respectively, above the well-capitalized regulatory thresholds, compared with 12.44 percent and 13.93 percent, respectively, at December 31, 2012. Our tangible common equity ratio and Tier 1 common risk-based capital ratio increased 13 basis points and 10 basis points to 10.05 percent and 12.45 percent, respectively, at March 31, 2013.

Acquisition of PB Capital Corporation’s Commercial Real Estate Division

On April 7, 2013, the Company announced that it reached an agreement to acquire PB Capital Corporation’s (PB Capital) institutional commercial real estate (CRE) lending division. The acquisition will expand the Company’s CRE presence in the U.S., and provide geographic and asset class diversification. Headquartered in New York, the CRE lending division of PB Capital has approximately $3.7 billion in loans outstanding on properties in major metropolitan areas across the U.S. The acquisition is subject to certain customary closing conditions and is expected to be completed in the second quarter of 2013.

8

Financial Performance

Net Interest Income

The following tables show the major components of net interest income and net interest margin:

	For the Three Months Ended																Increase (Decrease)
	March 31, 2013								March 31, 2012
	Average Balance			Interest Income/ Expense(1)		Average Yield/ Rate(1)(2)			Average Balance			Interest Income/ Expense(1)		Average Yield/ Rate(1)(2)			Average Balance						Interest Income/ Expense(1)
(Dollars in millions)																	Amount			Percent			Amount			Percent
Assets
Loans held for investment:(3)
Commercial and industrial	$	21,341		$	177		3.37	%	$	19,650		$	175		3.59	%	$	1,691			9	%	$	2			1	%
Commercial mortgage		9,898			101		4.10			8,274			85		4.11			1,624			20			16			19
Construction		650			8		5.21			803			8		3.94			(153	)		(19	)		—			0
Lease financing		1,062			7		2.49			1,021			11		4.25			41			4			(4	)		(36	)
Residential mortgage		22,858			222		3.88			19,802			216		4.36			3,056			15			6			3
Home equity and other consumer loans		3,602			34		3.84			3,692			36		3.94			(90	)		(2	)		(2	)		(6	)
Loans, before purchased credit-impaired loans		59,411			549		3.72			53,242			531		4.00			6,169			12			18			3
Purchased credit-impaired loans		1,142			80		28.33			907			66		29.04			235			26			14			21
Total loans held for investment		60,553			629		4.19			54,149			597		4.42			6,404			12			32			5
Securities		21,824			121		2.21			24,265			142		2.35			(2,441	)		(10	)		(21	)		(15	)
Interest bearing deposits in banks		4,223			3		0.25			1,731			2		0.25			2,492			144			1			50
Federal funds sold and securities purchased under resale agreements		171			—		0.19			61			—		0.21			110			180			—			—
Trading account assets		151			—		0.29			151			—		0.62			—			—			—			—
Other earning assets		133			—		0.64			146			—		0.10			(13	)		(9	)		—			—
Total earning assets		87,055			753		3.48			80,503			741		3.68			6,552			8			12			2
Allowance for loan losses		(653	)							(765	)							112			15
Cash and due from banks		1,399								1,326								73			6
Premises and equipment, net		705								673								32			5
Other assets		8,143								7,712								431			6
Total assets	$	96,649							$	89,449							$	7,200			8	%
Liabilities
Interest bearing deposits:
Transaction and money market accounts	$	31,705		$	22		0.28		$	25,609		$	14		0.22		$	6,096			24		$	8			57
Savings		5,855			2		0.14			5,278			2		0.16			577			11			—			—
Time		12,314			41		1.34			13,443			42		1.24			(1,129	)		(8	)		(1	)		(2	)
Total interest bearing deposits		49,874			65		0.53			44,330			58		0.52			5,544			13			7			12
Commercial paper and other short-term borrowings(4)		1,837			1		0.21			4,335			3		0.29			(2,498	)		(58	)		(2	)		(67	)
Long-term debt		5,406			36		2.68			6,079			36		2.41			(673	)		(11	)		—			—
Total borrowed funds		7,243			37		2.05			10,414			39		1.53			(3,171	)		(30	)		(2	)		(5	)
Total interest bearing liabilities		57,117			102		0.72			54,744			97		0.71			2,373			4			5			5
Noninterest bearing deposits		24,382								20,095								4,287			21
Other liabilities		2,302								2,722								(420	)		(15	)
Total liabilities		83,801								77,561								6,240			8
Equity
UNBC Stockholder’s equity		12,584								11,621								963			8
Noncontrolling interests		264								267								(3	)		(1	)
Total equity		12,848								11,888								960			8
Total liabilities and equity	$	96,649							$	89,449							$	7,200			8	%
Net interest income/spread (taxable-equivalent basis)					651		2.76	%					644		2.97	%								7			1	%
Impact of noninterest bearing deposits							0.21								0.19
Impact of other noninterest bearing sources							0.04								0.04
Net interest margin							3.01								3.20
Less: taxable-equivalent adjustment					3								3											—			—
Net interest income				$	648							$	641										$	7			1

⁽¹⁾  Yields and interest income are presented on a taxable-equivalent basis using the federal statutory tax rate of 35 percent.

⁽²⁾  Annualized.

⁽³⁾  Average balances on loans outstanding include all nonperforming loans. The amortized portion of net loan origination fees (costs) is included in interest income on loans, representing an adjustment to the yield.

⁽⁴⁾  Includes interest bearing trading liabilities.

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Net interest income for the first quarter of 2013 increased $7 million, or 1 percent, compared with the first quarter of 2012. The increase was primarily due to growth in total loans held for investment, reflecting the impact from both organic growth and the PCBC acquisition. The increase in net interest income was largely offset by contraction in the net interest margin, reflecting declining yields on total loans held for investment and securities.

Average total loans held for investment increased $6.4 billion for the quarter ended March 31, 2013 compared with the quarter ended March 31, 2012, primarily due to growth in residential mortgage loans, commercial and industrial loans, and commercial mortgage loans, and the PCBC acquisition. Deposit balances grew significantly, primarily due to the PCBC and Smartstreet acquisitions. Average interest bearing deposits increased $5.5 billion or 13 percent, and average noninterest bearing deposits increased $4.3 billion, or 21 percent.

Noninterest Income and Noninterest Expense

The following tables detail our noninterest income and noninterest expense for the first quarters of 2013 and 2012:

Noninterest Income

	For the Three Months Ended
	March 31, 2013			March 31, 2012		Increase (Decrease)
(Dollars in millions)						Amount			Percent
Service charges on deposit accounts	$	53		$	55	$	(2	)		(4	)%
Trust and investment management fees		35			30		5			17
Trading account activities		8			31		(23	)		(74	)
Securities gains, net		96			19		77			nm
Credit facility fees		26			25		1			4
Merchant banking fees		16			23		(7	)		(30	)
Brokerage commissions and fees		12			10		2			20
Other investment income		3			2		1			50
Card processing fees, net		9			8		1			13
Other, net		(3	)		11		(14	)		nm
Total noninterest income	$	255		$	214	$	41			19	%

nm = not meaningful

Gains from the sale of securities totaled $96 million in the first quarter of 2013 reflecting securities portfolio rebalancing activities. Partially offsetting the securities gains were lower fees from trading account activities primarily due to decreased customer activity. Other noninterest income declined due to an increase in indemnification asset amortization, driven by improved FDIC covered loans performance.

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Noninterest Expense

	For the Three Months Ended
	March 31, 2013		March 31, 2012			Increase (Decrease)
(Dollars in millions)						Amount			Percent
Salaries and other compensation	$	312	$	265		$	47			18	%
Employee benefits		109		99			10			10
Salaries and employee benefits		421		364			57			16
Net occupancy and equipment		75		68			7			10
Professional and outside services		58		46			12			26
Intangible asset amortization		16		21			(5	)		(24	)
Software		21		17			4			24
Regulatory assessments		20		18			2			11
Low income housing credit investment amortization		15		13			2			15
Advertising and public relations		17		11			6			55
Communications		11		10			1			10
Data processing		11		8			3			38
(Reversal of) provision for losses on off-balance sheet commitments		15		(2	)		17			nm
Other		33		40			(7	)		(18	)
Total noninterest expense	$	713	$	614		$	99			16	%

nm = not meaningful

Noninterest expense in the first quarter of 2013 was $713 million compared with $614 million in the first quarter of 2012. Salaries and employee benefits increased $57 million primarily due to increased staff expenses, which reflect the impact of the acquisition of PCBC and higher pension and health benefits expense. Professional and outside services increased due to various regulatory and compliance projects and acquisition-related costs. The provision for losses on off-balance sheet commitments was $15 million in the first quarter of 2013 compared to a benefit of $2 million in the first quarter of 2012 primarily reflecting an extended loss emergence period for commercial credit facilities.

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The adjusted efficiency ratio is a non-GAAP financial measure used by management to measure the efficiency of our operations, focusing on those costs management believes to be most relevant to our business activities. Productivity initiative costs primarily consist of salaries and benefits associated with operational efficiency enhancements. Productivity initiative gains reflect the gain from the sale of certain business units in the first quarter of 2012. The following table shows the calculation of this ratio for the first quarters of 2013 and 2012:

	For the Three Months Ended
(Dollars in millions)	March 31, 2013			March 31, 2012
Noninterest Expense	$	713		$	614
Less: Foreclosed asset expense and other credit costs		(1	)		1
Less: (Reversal of) provision for losses on off-balance sheet commitments		15			(2	)
Less: Productivity initiative costs		4			6
Less: LIHC investment amortization expense		15			13
Less: Expenses of the LIHC consolidated VIEs		6			7
Less: Merger costs related to acquisitions		40			1
Less: Net adjustments related to privatization transaction		14			22
Less: Intangible asset amortization		3			—
Net noninterest expense (a)	$	617		$	566
Total Revenue	$	903		$	855
Add: Net interest income taxable-equivalent adjustment		3			3
Less: Productivity initiative gains		—			23
Less: Accretion related to privatization-related fair value adjustments		5			11
Less: Other credit costs		(9	)		—
Total revenue (b)	$	910		$	824
Adjusted efficiency ratio (a)/(b)		67.76	%		68.76	%

Income Tax Expense

The effective income tax rate was 26 percent in the first quarter of 2013 compared with 21 percent in the first quarter of 2012. The change in the effective tax rate for the first quarter of 2013 compared with the first quarter of 2012 was primarily driven by one-time items recorded in the first quarter of 2012.

For further information regarding income tax expense, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Income Tax Expense” and “Changes in our tax rates could affect our future results” in “Risk Factors” in Part I, Item  1A and Note 11 to the consolidated financial statements in our 2012 Form 10-K.

Balance Sheet Analysis

Securities

Our securities portfolio is primarily used for liquidity and interest rate risk management purposes, to invest cash resulting from excess liquidity, and to a lesser extent, to support our business development objectives. We strive to maximize total return while managing this objective within appropriate risk parameters. Securities available for sale are principally comprised of residential and commercial mortgage-backed securities, collateralized loan obligations (CLOs) and direct bank purchase bonds. Direct bank purchase bonds are instruments that are issued in bond form, accounted for as securities, but underwritten as loans with features that are typically found in commercial loans. Securities held to maturity consist of U.S. government and government sponsored agencies residential mortgage-backed securities and CLOs. The CLOs consist of Cash Flow CLOs. A Cash Flow CLO is a structured finance product that securitizes a diversified pool of loan assets into multiple classes of notes from the cash flows generated by such loans.

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Cash Flow CLOs pay the note holders through the receipt of interest and principal repayments from the underlying loans, unlike other types of CLOs that pay note holders through the trading and sale of underlying collateral.

The amortized cost, gross unrealized gains, gross unrealized losses and fair values of securities are detailed in Note 3 to our consolidated financial statements included in this Form 10-Q.

Loans Held for Investment

The following table shows loans held for investment outstanding by loan type at the end of each period presented:

	March 31, 2013		December 31, 2012		Increase (Decrease)
(Dollars in millions)					Amount			Percent
Loans held for investment:
Commercial and industrial	$	21,433	$	20,827	$	606			3	%
Commercial mortgage		9,918		9,939		(21	)		—
Construction		659		627		32			5
Lease financing		1,060		1,104		(44	)		(4	)
Total commercial portfolio		33,070		32,497		573			2
Residential mortgage		23,146		22,705		441			2
Home equity and other consumer loans		3,542		3,647		(105	)		(3	)
Total consumer portfolio		26,688		26,352		336			1
Total loans held for investment, before purchased credit-impaired loans		59,758		58,849		909			2
Purchased credit-impaired loans		1,124		1,185		(61	)		(5	)
Total loans held for investment	$	60,882	$	60,034	$	848			1	%

Cross-Border Outstandings

Our cross-border outstandings reflect certain additional economic and political risks that are not reflected in domestic outstandings. These risks include those arising from exchange rate fluctuations and restrictions on the transfer of funds. Our total cross-border outstandings for Canada, the only country where such outstandings exceeded one percent of total assets, were $1.5 billion at both March 31, 2013 and December 31, 2012, respectively. The cross-border outstandings are based on category and domicile of ultimate risk and are comprised of balances with banks, trading account assets, securities available for sale, securities purchased under resale agreements, loans, accrued interest receivable, acceptances outstanding and investments with foreign entities.

As of March 31, 2013, our sovereign and non-sovereign debt exposure to European countries was insignificant.

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Deposits

The table below presents our deposits as of March 31, 2013 and December 31, 2012.

(Dollars in millions)	March 31, 2013		December 31, 2012		Increase (Decrease)
					Amount			Percent
Interest checking	$	4,645	$	5,178	$	(533	)		(10	)%
Money market		27,061		25,169		1,892			8
Total interest-bearing transaction and money market accounts		31,706		30,347		1,359			4
Savings		5,861		5,853		8			—
Time		11,744		12,577		(833	)		(7	)
Total interest bearing deposits		49,311		48,777		534			1
Noninterest bearing deposits		24,679		25,478		(799	)		(3	)
Total deposits	$	73,990	$	74,255	$	(265	)		—	%
Total interest bearing deposits include the following brokered deposits:
Interest bearing transaction and money market accounts	$	3,100	$	2,474	$	626			25	%
Time		3,191		2,959		232			8
Total brokered deposits	$	6,291	$	5,433	$	858			16	%
Core Deposits:
Total deposits	$	73,990	$	74,255	$	(265	)		—	%
Less: Total brokered deposits		6,291		5,433		858			16
Less: Total foreign deposits and nonbrokered domestic time deposits of over $250,000		4,114		5,053		(939	)		(19	)
Total core deposits	$	63,585	$	63,769	$	(184	)		—	%

Total deposits and core deposits decreased $265 million and $184 million, respectively, from December 31, 2012 to March 31, 2013. Core deposits as a percentage of total deposits were 86 percent at both March 31, 2013 and December 31, 2012.

Allowance for Credit Losses

Allowance Policy and Methodology

We maintain an allowance for credit losses (defined as both the allowance for loan losses and the allowance for off-balance sheet commitment losses) to absorb losses inherent in the loan portfolio as well as for off-balance sheet commitments. Understanding our policies on the allowance for credit losses is fundamental to understanding our consolidated financial condition and consolidated results of operations. Accordingly, our significant accounting policies on the allowance for credit losses are discussed in detail in Note 1 to our consolidated financial statements and in the section “Allowances for Credit Losses” included in our “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 2012 Form 10-K. For additional information regarding our allowance for loan losses, refer to Note 4 of our consolidated financial statements in this Form 10-Q.

Allowance and Related Provision for Credit Losses

The allowance for loan losses decreased $15 million to $638 million as of March 31, 2013 compared with $653 million at December 31, 2012. This decrease is primarily due to improving credit quality in our

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consumer portfolio, partially offset by updates to the attributions for certain sectors within the commercial portfolio segment. The unallocated allowance was $38 million at March 31, 2013, compared with $110 million at December 31, 2012. The allowance for loan losses for the commercial portfolio was updated to reflect an extension of the loss emergence period, which previously had been estimated within the unallocated allowance.

Our ratio of nonaccrual loans to total loans held for investment was 0.85 percent at March 31, 2013 and 0.84 percent at December 31, 2012. Our ratio of allowance for loan losses to total loans held for investment decreased to 1.05 percent at March 31, 2013 from 1.09 percent at December 31, 2012. Annualized net loans charged off to average total loans held for investment was 0.10 percent for the quarter ended March 31, 2013 compared with 0.40 percent for the quarter ended March 31, 2012. Criticized credits in the commercial segment increased from $1.3 billion at December 31, 2012 to $1.5 billion at March 31, 2013. The increase was primarily attributable to a single loan rated as special mention, which was paid down subsequent to quarter end. Criticized credits are those that have regulatory risk grades of “special mention,” “substandard” or “doubtful.” Special mention credits are potentially weak, as the borrower has begun to exhibit deteriorating trends, which, if not corrected, could jeopardize repayment of the loan and result in further downgrade. Adversely classified credits are those that are internally risk graded as substandard or doubtful. Substandard credits have well-defined weaknesses, which, if not corrected, could jeopardize the full satisfaction of the debt. A credit classified as “doubtful” has critical weaknesses that make full collection improbable on the basis of currently existing facts and conditions.

15

Change in the Total Allowance for Credit Losses.

The following table sets forth a reconciliation of changes in our allowance for credit losses:

(Dollars in millions)	March 31,
	2013			2012
Balance, beginning of period	$	653		$	764
(Reversal of) provision for loan losses, excluding
FDIC covered loans		(3	)		1
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification		—			(2	)
Increase (decrease) in allowance covered by FDIC indemnification		2			(6	)
Loans charged off:
Commercial and industrial		(1	)		(34	)
Commercial mortgage		(2	)		(6	)
Total commercial portfolio		(3	)		(40	)
Residential mortgage		(7	)		(12	)
Home equity and other consumer loans		(6	)		(11	)
Total consumer portfolio		(13	)		(23	)
FDIC covered loans		(3	)		—
Total loans charged off		(19	)		(63	)
Recoveries of loans previously charged off:
Commercial and industrial		3			4
Commercial mortgage		—			3
Construction		—			1
Total commercial portfolio		3			8
Home equity and other consumer loans		1			1
Total consumer portfolio		1			1
FDIC covered loans		1			1
Total recoveries of loans previously charged off		5			10
Net loans charged off		(14	)		(53	)
Ending balance of allowance for loan losses	$	638		$	704
Components of allowance for loan losses and credit losses:
Allowance for loan losses, excluding allowance on purchased credit-impaired loans	$	637		$	694
Allowance for loan losses on purchased credit-impaired loans		1			10
Total allowance for loan losses		638			704
Allowance for losses on off-balance sheet commitments		138			131
Total allowance for credit losses	$	776		$	835

Nonperforming Assets

Nonperforming assets consist of nonaccrual loans and OREO. Nonaccrual loans are those for which management has discontinued accrual of interest because there exists significant uncertainty as to the full and timely collection of either principal or interest, or such loans have become contractually past due 90 days with respect to principal or interest. For a more detailed discussion of the accounting for nonaccrual loans, see Note 1 to our consolidated financial statements included in our 2012 Form 10-K. OREO includes property where the Bank acquired title through foreclosure or “deed in lieu” of foreclosure.

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The following table sets forth an analysis of nonperforming assets:

	March 31, 2013		December 31, 2012		Increase (Decrease)
(Dollars in millions)					Amount			Percent
Commercial and industrial	$	49	$	48	$	1			2	%
Commercial mortgage		57		65		(8	)		(12	)
Total commercial portfolio		106		113		(7	)		(6	)
Residential mortgage		326		306		20			7
Home equity and other consumer loans		59		56		3			5
Total consumer portfolio		385		362		23			6
Total nonaccrual loans, before purchased credit-impaired loans		491		475		16			3
Purchased credit-impaired loans		29		30		(1	)		(3	)
Total nonaccrual loans		520		505		15			3
OREO, before FDIC covered OREO		29		45		(16	)		(36	)
FDIC covered OREO		58		66		(8	)		(12	)
Total nonperforming assets	$	607	$	616	$	(9	)		(1	)%
Total nonperforming assets, excluding purchased credit-impaired loans and FDIC covered OREO	$	520	$	520	$	—			—	%
Troubled debt restructurings:
Accruing	$	372	$	401	$	(29	)		(7	)%
Nonaccruing (included in total nonaccrual loans above)	$	223	$	209	$	14			7	%
Allowance for loan losses	$	638	$	653	$	(15	)		(2	)%
Allowance for credit losses	$	776	$	770	$	6			1	%

Troubled Debt Restructurings

Troubled debt restructurings (TDRs) are those loans for which we have granted a concession to a borrower as a result of the borrower experiencing financial difficulty and, consequently, we receive less than the current market-based compensation for loans with similar risk characteristics. Such loans are classified as impaired and are reviewed for specific reserves either individually or in pools with similar risk characteristics. Our loss mitigation strategies are designed to minimize economic loss and, at times, may result in changes to original terms, including interest rate changes, maturity extensions, principal paydowns, covenant waivers and payment deferrals, or some combination thereof. We evaluate whether these changes to the terms and conditions of our loans meet the TDR criteria after considering the specific situation of the borrower and all relevant facts and circumstances related to the modification. For our consumer portfolio segment, TDRs are initially placed on nonaccrual and typically a minimum of six consecutive months of sustained performance is required before returning to accrual status. For our commercial portfolio segment, we generally determine accrual status for TDRs by performing an individual assessment of each loan, which may include, among other factors, the consideration of demonstrated performance by the borrower under the previous terms.

Modifications of purchased credit-impaired loans that are accounted for within loan pools do not result in the removal of these loans from the pool even if the modification would otherwise be considered a TDR. Each pool is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Accordingly, modifications of loans within such pools are not considered TDRs.

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The following table provides a summary of TDRs by loan type as of March 31, 2013 and December 31, 2012. Refer to Note 4 to our consolidated financial statements in this Form 10-Q for more information.

					As a Percentage of Ending Loan Balances
(Dollars in millions)	March 31, 2013		December 31, 2012		March 31, 2013			December 31, 2012
Commercial and industrial	$	251	$	215		1.17	%		1.03	%
Commercial mortgage		38		64		0.39			0.64
Construction		2		35		0.32			5.54
Total commercial portfolio		291		314		0.88			0.96
Residential mortgage		279		271		1.20			1.19
Home equity and other consumer loans		21		21		0.59			0.58
Total consumer portfolio		300		292		1.12			1.11
Total restructured loans, excluding purchased credit-impaired loans(1)	$	591	$	606		0.99	%		1.03	%

⁽¹⁾  Amounts exclude $4 million of TDRs covered by FDIC loss share agreements at both March 31, 2013 and December 31, 2012, respectively.

Loans 90 Days or More Past Due and Still Accruing

Loans held for investment 90 days or more past due and still accruing totaled $3 million and $1 million at March 31, 2013 and December 31, 2012, respectively. These amounts exclude purchased credit-impaired loans, which are generally accounted for within loan pools, of $125 million and $124 million at March 31, 2013 and December 31, 2012, respectively. The past due status of individual loans included within purchased credit-impaired loan pools is not a meaningful indicator of credit quality, as potential credit losses are measured at the loan pool level against prior expectations of cash flow performance.

Capital

The following tables summarize our risk-based capital, risk-weighted assets, and risk-based capital ratios:

UnionBanCal Corporation

(Dollars in millions)	March 31, 2013		December 31, 2012
Capital Components
Tier 1 capital	$	10,031	$	9,864
Tier 2 capital		1,191		1,184
Total risk-based capital	$	11,222	$	11,048
Risk-weighted assets	$	80,018	$	79,321
Average total assets for leverage capital purposes	$	93,755	$	88,265

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	March 31, 2013					December 31, 2012						March 31, 2013 Minimum Regulatory Requirement						March 31, 2013 “Well-Capitalized” Regulatory Requirement
(Dollars in millions)	Amount		Ratio			Amount		Ratio				Amount		Ratio				Amount		Ratio
Capital Ratios
Tier 1 capital (to risk-weighted assets)	$	10,031		12.54	%	$	9,864		12.44	%	³	$	3,201		4.0	%	³	$	4,801		6.0	%
Total capital (to risk-weighted assets)		11,222		14.02			11,048		13.93		³		6,402		8.0		³		8,002		10.0
Tier 1 leverage(1)		10,031		10.70			9,864		11.18		³		3,750		4.0		³		na		na

⁽¹⁾  Tier 1 capital divided by average total assets for leverage capital purposes (excluding certain intangible assets).

na—not applicable

Union Bank, N.A.

(Dollars in millions)	March 31, 2013		December 31, 2012
Capital Components
Tier 1 capital	$	9,341	$	9,192
Tier 2 capital		1,178		1,170
Total risk-based capital	$	10,519	$	10,362
Risk-weighted assets	$	79,422	$	78,674
Average total assets for leverage capital purposes	$	93,160	$	87,456

	March 31, 2013					December 31, 2012						March 31, 2013 Minimum Regulatory Requirement						March 31, 2013 “Well-Capitalized” Regulatory Requirement
(Dollars in millions)	Amount		Ratio			Amount		Ratio				Amount		Ratio				Amount		Ratio
Capital Ratios
Tier 1 capital (to risk-weighted assets)	$	9,341		11.76	%	$	9,192		11.68	%	³	$	3,177		4.0	%	³	$	4,765		6.0	%
Total capital (to risk-weighted assets)		10,519		13.24			10,362		13.17		³		6,354		8.0		³		7,942		10.0
Tier 1 leverage(1)		9,341		10.03			9,192		10.51		³		3,726		4.0		³		4,658		5.0

⁽¹⁾  Tier 1 capital divided by average total assets for leverage capital purposes (excluding certain intangible assets).

Both the Company and Union Bank are subject to various regulations of the federal banking agencies, including requirements to maintain minimum ratios of Total and Tier 1 capital to risk-weighted assets and of Tier 1 capital to quarterly average assets (the leverage ratio). The Company and the Bank interact with the federal banking agencies regarding matters that pertain to capital management and during the course of those discussions become aware, from time to time, of evolving regulatory interpretations of capital adequacy guidelines. As these interpretations are clarified, their resolution can result in changes to the methodologies applied to the computations of our capital ratios. As of March 31, 2013, management believes the capital ratios of the Company and the Bank met all regulatory requirements of “well-capitalized” institutions.

In January 2013, the Company timely filed its Capital Plan Review (CapPR) with the Federal Reserve. The CapPR is an assessment of the capital plans of bank holding companies in the U.S. with total assets exceeding $50 billion that were not included in the Federal Reserve’s Comprehensive Capital Analysis and Review of the largest U.S. bank holding companies. In March 2013, the Company was notified by the Federal Reserve that it did not object to the Company’s planned capital actions. The Federal Reserve’s regulations provide that a bank holding company may be required to revise and re-submit its capital plan if certain material events occur after adoption of its plan. For further information, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Capital” in our 2012 Form 10-K.

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In addition to capital ratios determined in accordance with regulatory requirements, we consider the tangible common equity ratio and the Tier 1 common capital ratio when evaluating capital utilization and adequacy. These capital ratios are viewed by management, and presented below, to further facilitate the understanding of our capital structure and for use in assessing and comparing the quality and composition of UnionBanCal’s capital structure to other financial institutions. These ratios are not defined by accounting principles generally accepted in the United States of America (U.S. GAAP) or federal banking regulations; therefore, they are considered non-GAAP financial measures. Our tangible common equity ratio calculation methods may differ from those used by other financial services companies. Refer to “Supervision and Regulation - Regulatory Capital Standards - Basel Committee Capital Standards and U.S. Regulatory Response” in Part I, Item 1 of our 2012 Form 10-K for additional information regarding the Basel Committee’s capital standards.

The following table summarizes the calculation of our tangible common equity ratio and Tier 1 common capital ratio as of March 31, 2013 and December 31, 2012:

(Dollars in millions)	March 31, 2013			December 31, 2012			Increase (Decrease)
							Amount			Percent
Total UNBC stockholder’s equity	$	12,594		$	12,491		$	103			1	%
Goodwill		(2,952	)		(2,942	)		(10	)		—
Intangible assets, except mortgage servicing rights (MSRs)		(337	)		(373	)		36			10
Deferred tax liabilities related to goodwill and intangible assets		122			129			(7	)		(5	)
Tangible common equity (a)	$	9,427		$	9,305		$	122			1
Tier 1 capital, determined in accordance with regulatory requirements	$	10,031		$	9,864		$	167			2
Junior subordinated debt payable to trusts		(66	)		(66	)		—			—
Tier 1 common equity (b)	$	9,965		$	9,798		$	167			2
Total assets	$	96,959		$	96,992		$	(33	)		—
Goodwill		(2,952	)		(2,942	)		(10	)		—
Intangible assets, except MSRs		(337	)		(373	)		36			10
Deferred tax liabilities related to goodwill and intangible assets		122			129			(7	)		(5	)
Tangible assets (c)	$	93,792		$	93,806		$	(14	)		—
Risk-weighted assets, determined in accordance with regulatory requirements (d)	$	80,018		$	79,321		$	697			1	%
Tangible common equity ratio (a)/(c)		10.05	%		9.92	%
Tier 1 common capital ratio (b)/(d)		12.45			12.35

Quantitative and Qualitative Disclosures About Market Risk

The objective of market risk management is to mitigate any adverse impact on earnings and capital arising from changes in interest rates and other market variables. Market risk management supports our broad objective of enhancing shareholder value, which encompasses the achievement of stable earnings growth while promoting capital stability over time. Market risk is defined as the risk of loss arising from an adverse change in the market value of financial instruments caused by fluctuations in market prices or rates. The primary market risk to which we are exposed is interest rate risk. Substantially all of our interest rate risk arises from instruments, positions and transactions entered into for purposes other than trading. These include loans, securities, deposits, borrowings and derivative financial instruments. To a much lesser degree, we are exposed to market risk in our trading portfolio.

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Risk Governance

The Board of Directors (Board), directly or through its appropriate committee, approves our Asset Liability Management Policy (ALM Policy), which governs the management of market and liquidity risks and guides our investment, derivatives, trading and funding activities. The ALM Policy establishes the Company’s risk tolerance by outlining standards for measuring market and liquidity risks, creates Board-level limits for specific market risks, establishes Asset Liability Management Committee (ALCO) responsibilities and requires independent review and oversight of market and liquidity risk activities.

The Risk & Capital Committee (RCC), composed of selected senior officers of the Company strives, among other things, to ensure that the Company has an effective process to identify, monitor, measure, and manage market risk as required by the ALM Policy. The RCC provides the broad and strategic guidance of market risk management by defining the risk and return direction for the Company, delegating to and reviewing market risk management activities of the ALCO and by approving the investment, derivatives and trading policies that govern the Company’s activities. ALCO, as authorized by the RCC, is responsible for the management of market risk and approves specific risk management programs including those related to interest rate hedging, investment securities, wholesale funding and trading activities.

The Treasurer is primarily responsible for the implementation of risk management strategies approved by ALCO and for operational management of market risk through the funding, investment and derivatives hedging activities of Corporate Treasury. The manager of Global Capital Markets (GCM) is responsible for managing price risk through the trading activities conducted in GCM. The Market Risk Management (MRM) unit is responsible for the monitoring of market risk and functions independently of all operating and management units.

The Company has separate and distinct methods for managing the market risk associated with our asset and liability management activities and our trading activities, as described below.

Interest Rate Risk Management (Other Than Trading)

ALCO monitors interest rate risk monthly through a variety of modeling techniques that are used to quantify the sensitivity of net interest income to changes in interest rates. Our net interest income policy measurement typically involves a simulation in which we estimate the net interest income impact of gradual parallel shifts in the yield curve of up and down 200 basis points over a 12-month horizon using a forecasted balance sheet. Due to the current and persistently low interest rate environment, the -200 basis point parallel scenario was replaced with a -100 basis point parallel scenario.

Net Interest Income Sensitivity

The table below presents the estimated increase (decrease) in net interest income given a gradual parallel shift in the yield curve up 200 basis points and down 100 basis points over a 12-month horizon.

(Dollars in millions)	March 31, 2013			December 31, 2012
Effect on net interest income:
Increase 200 basis points	$	114.4		$	118.8
as a percentage of base case net interest income		4.28	%		4.42	%
Decrease 100 basis points	$	(65.4	)	$	(49.1	)
as a percentage of base case net interest income		(2.45	)%		(1.83	)%

An increase in rates increases net interest income. Approximately 70 percent of the net interest income increase is due to on and off-balance sheet position re-pricing differences with maturities greater than two years. During the first quarter of 2013, the Company’s asset sensitive profile decreased slightly as changes were made to balance sheet composition and as a result of new activity forecasted to occur over the next twelve months. The remaining increase is attributable to on and off-balance sheet position

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re-pricing differences with maturities of two years or less. We believe that our simulation provides management with a comprehensive view of the sensitivity of net interest income to changes in interest rates over the measurement horizon. However, as with any financial model, the underlying assumptions are inherently uncertain and subject to refinement. In particular, two significant models used in interest rate risk measurement address residential mortgage prepayment speeds and non-maturity deposit rate and balance behaviors. The mortgage prepayment model is periodically calibrated to reflect changes in customer behavior, but in the current atypical rate and credit environment, may be prone to lowered predictive capability when determining the borrower’s propensity or ability to prepay their mortgage. The deposit model uses the Company’s historical deposit pricing to forecast future deposit pricing in its scenarios. Management’s response to future rate scenarios may deviate from historic responses as the 2008 financial crisis may have changed future competitive responses and customer behaviors with respect to deposit repricing. Actual results may differ from those derived in the simulation analysis due to extraordinary market events, unanticipated changes in customer behavior, market interest rates, product pricing and investment, funding and hedging activities.

Investment Securities

Our ALM securities portfolio is composed of available for sale and held to maturity securities. As of March 31, 2013, this portfolio totaled $21.1 billion and was composed of $20.1 billion of available for sale securities and $1.0 billion of held to maturity securities. As of December 31, 2012, this portfolio totaled $20.9 billion and was composed of $19.8 billion of available for sale securities and $1.1 billion of held to maturity securities. The expected weighted average life of our ALM securities portfolio was 5.1 years at March 31, 2013. Based on current prepayment projections, the estimated ALM securities portfolio’s effective duration was 3.5 at March 31, 2013, compared with 2.3 at December 31, 2012. Effective duration is a measure of price sensitivity of a bond portfolio to immediate parallel shifts in interest rates. An effective duration of 3.5 suggests an expected price decrease of approximately 3.5 percent for an immediate 1 percent parallel increase in interest rates. At March 31, 2013, approximately $7.0 billion of the portfolio was pledged to secure trust and public deposits and for other purposes as required or permitted by law.

In addition to our ALM securities, our securities available for sale portfolio includes approximately $1.5 billion of direct bank purchase bonds which are managed within our Corporate Banking operating segment. These instruments are accounted for as securities, but underwritten as loans with terms that are closely aligned with traditional commercial loan features, and are subject to national bank regulatory lending authority standards. These instruments typically are not issued in bearer form, nor are they registered with the SEC or the Depository Trust Company. Additionally, these instruments generally contain certain transferability restrictions and are not assigned external credit ratings.

ALM Derivatives

During the first quarter of 2013, the notional amount of the ALM derivatives portfolio decreased by $1.1 billion as $1.1 billion of interest rate cap contracts used to hedge interest-bearing deposits expired. The Company did not add any derivative positions during this period.

The fair value of the ALM derivatives portfolio decreased as receive fixed interest rate swap contracts declined in value from increases in interest rates. For additional discussion of derivative instruments and our hedging strategies, see Note 10 to our consolidated financial statements in this Form 10-Q and Note 17 to our consolidated financial statements included in our 2012 Form 10-K.

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(Dollars in millions)	March 31, 2013		December 31, 2012		Increase (Decrease)
Total gross notional amount of positions held for purposes other than trading:
Interest rate swap receive fixed contracts	$	5,300	$	5,300	$	—
Interest rate cap purchased contracts		2,050		3,100		(1,050	)
Total interest rate contracts	$	7,350	$	8,400	$	(1,050	)
Fair value of positions held for purposes other than trading:
Gross positive fair value	$	24	$	28	$	(4	)
Positive (negative) fair value of positions, net	$	24	$	28	$	(4	)

Trading Activities

We enter into trading account activities primarily as a financial intermediary for customers and, to a much lesser extent, for our own account. By acting as a financial intermediary, we are able to provide our customers with access to a range of products from the securities, foreign exchange and derivatives markets. In acting for our own account, we may take positions in certain securities, foreign exchange and interest rate instruments, subject to various limits in amount, tenor and other respects, with the objective of generating trading profits.

We believe that the risks associated with these positions are prudently managed. We utilize a combination of position limits, Value-at-Risk (VaR), and stop-loss limits, applied at an aggregated level and to various sub-components within those limits. Positions are controlled and reported both in notional and VaR terms. Our calculation of VaR estimates how high the loss in fair value might be, at a 99 percent confidence level, due to an adverse shift in market prices over a period of ten business days. VaR at the trading activity level is managed within the maximum limit of $14 million established by Board policy for total trading positions. The VaR model incorporates assumptions on key parameters, including holding period and historical volatility.

Consistent with our business strategy of focusing on meeting the needs of our customers through the sale of capital markets products, we manage our trading risk exposures at relatively low levels. Our foreign exchange business continues to derive the majority of its revenue from customer-related transactions. We take trading positions with other banks only on a limited basis and we do not take any large or long-term strategic positions in the market for our own portfolio. Similarly, we continue to generate most of our trading income from customer-related transactions.

As of March 31, 2013, we had notional amounts of $39.6 billion of interest rate derivative contracts, $2.7 billion of foreign exchange derivative contracts and $3.5 billion of commodity derivative contracts. We enter into these agreements for the principal purpose of accommodating the needs of our customers. We generally take offsetting positions in these transactions to mitigate our exposure to market risk. As of March 31, 2013, notional amounts of $1.0 billion, $2.2 billion and $3.7 billion of foreign exchange, commodity and equity contracts, respectively, represented our exposure to the embedded derivatives and the related hedges contained in our market-linked certificates of deposit.

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The following table provides the notional value and the fair value of our trading derivatives portfolio as of March 31, 2013 and December 31, 2012 and the change in fair value between March 31, 2013 and December 31, 2012:

(Dollars in millions)	March 31, 2013		December 31, 2012		Increase (Decrease)
Total gross notional amount of positions held for trading purposes:
Interest rate contracts	$	39,545	$	37,790	$	1,755
Commodity contracts		5,703		5,595		108
Foreign exchange contracts(1)		3,726		4,050		(324	)
Equity contracts		3,691		3,631		60
Total	$	52,665	$	51,066	$	1,599
Fair value of positions held for trading purposes:
Gross positive fair value	$	1,312	$	1,413	$	(101	)
Gross negative fair value		1,223		1,317		(94	)
Positive fair value of positions, net	$	89	$	96	$	(7	)

⁽¹⁾  Excludes spot contracts with a notional amount of $0.5 billion at both March 31, 2013 and December 31, 2012, respectively.

Liquidity Risk

Liquidity risk is the risk that the Company’s financial condition or overall safety and soundness is adversely affected by an inability, or perceived inability, to meet its contractual, including contingent, obligations. The objective of liquidity risk management is to maintain a sufficient amount of liquidity and diversity of funding sources to allow the Company to meet obligations in both stable and adverse conditions.

The management of liquidity risk is governed by the ALM Policy under the oversight of the RCC and the Audit & Finance Committee of the Board. ALCO oversees liquidity risk management activities. The Company’s corporate treasury department (Corporate Treasury) formulates the Company’s liquidity and contingency planning strategies and is responsible for identifying, managing and reporting on liquidity risk. Market Risk Management, which is part of the Enterprise Wide Risk Reporting and Analysis unit, partners with Corporate Treasury to establish sound policy and effective risk controls. Our Contingency Funding Plan identifies actions to be taken to help ensure adequate liquidity if an event should occur that disrupts or adversely affects the Company’s normal funding activities.

Liquidity risk is managed using a total balance sheet perspective that analyzes all sources and uses of liquidity including loans, investments, deposits and borrowings, as well as off-balance sheet exposures. Management does not rely on any one source of liquidity and manages availability in response to changing balance sheet needs. Various tools are used to measure and monitor liquidity, including pro-forma forecasting of the sources and uses of cash flows over a 12-month time horizon, stress testing of the pro-forma forecast and assessment of the Bank’s capacity to raise incremental unsecured and secured funding. Stress testing, which incorporates both bank-specific and systemic market scenarios that would adversely affect the Bank’s liquidity position and profile, facilitates the identification of appropriate remedial measures to help ensure that the Bank maintains adequate liquidity in adverse conditions. Such measures may include extending the maturity profile of liabilities, optimizing liability levels through pricing strategies, adding new funding sources, altering dependency on certain funding sources or selling assets.

Our primary sources of liquidity are core deposits (described below), our securities portfolio and wholesale funding. Wholesale funding includes unsecured funds raised from interbank and other sources, both domestic and international, including both senior and subordinated debt. Also included are secured funds raised by selling securities under repurchase agreements and by borrowing from the FHLB. We

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evaluate and monitor the stability and reliability of our various funding sources to help ensure that we have sufficient liquidity in adverse circumstances. We generally view our core deposits to be relatively stable. Secured borrowings via repurchase agreements and advances from the FHLB are also recognized as highly reliable funding sources, and we, therefore, maintain access to these sources primarily to meet our contingency funding needs.

Wholesale funding remained flat at $10.0 billion from December 31, 2012 to March 31, 2013. Total deposits decreased $0.3 billion from $74.3 billion at December 31, 2012 to $74.0 billion at March 31, 2013.

Core deposits, which exclude brokered deposits, foreign time deposits and domestic time deposits greater than $250,000, provide us with a sizable source of relatively stable and low-cost funds. At March 31, 2013, our core deposits totaled $63.6 billion and our total loan-to-total core deposit ratio was 95.7 percent.

The Bank maintains a variety of other funding sources, secured and unsecured, which management believes will be adequate to meet the Bank’s liquidity needs, including the following:

• The Bank has secured borrowing facilities with the FHLB and the Federal Reserve Bank. As of March 31, 2013, the Bank had $1.8 billion of borrowings outstanding with the FHLB, and the Bank had a remaining combined unused borrowing capacity from the FHLB and the Federal Reserve Bank of $31.1 billion.

• Our securities portfolio provides liquidity through either securities sales or repurchase agreements. Total unpledged securities increased by $0.7 billion from $12.9 billion at December 31, 2012 to $13.6 billion at March 31, 2013.

• The Bank has an $8.0 billion unsecured Bank Note Program, of which $4.7 billion was available for issuance at March 31, 2013. We do not have any firm commitments in place to sell securities under the Bank Note Program.

• In addition to the funding provided by the Bank, we raise funds at the holding company level. UnionBanCal Corporation has in place a shelf registration statement with the SEC permitting ready access to the public debt markets. As of March 31, 2013, $1.1 billion of debt or other securities were available for issuance under this shelf registration statement. We do not have any firm commitments in place to sell securities under this shelf registration statement.

We believe that these sources provide a stable funding base. As a result, we have not historically relied on BTMU for our normal funding needs.

Our costs and ability to raise funds in the capital markets are influenced by our credit ratings. Our credit ratings could be impacted by changes in the credit ratings of BTMU and MUFG. For further information, see “The Bank of Tokyo Mitsubishi UFJ’s and Mitsubishi UFJ Financial Group’s credit ratings and financial or regulatory condition could adversely affect our operations” in Part II, Item 1A. “Risk Factors” in this Form 10-Q. The following table provides our credit ratings as of March 31, 2013:

		Union Bank, N.A.	UnionBanCal Corporation
Standard & Poor’s	Long-term Short-term	A+ A-1	A A-1
Moody’s	Long-term Short-term	A2 P-1	A3 —
Fitch	Long-term Short-term	A F1	A F1

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Business Segments

We have three operating segments: Retail Banking Group, Corporate Banking Group and Pacific Rim Corporate Group. The Pacific Rim Corporate Group is included in “Other.” We have two reportable business segments: Retail Banking and Corporate Banking. Unlike financial accounting, there is no authoritative body of guidance for management accounting equivalent to U.S. GAAP. Consequently, reported results are not necessarily comparable with those presented by other companies, and they are not necessarily indicative of the results that would be reported by our business units if they were unique economic entities. The information, set forth in the tables that follow, is prepared using various management accounting methodologies to measure the performance of the individual segments. For a description of these methodologies, see Note 13 to our consolidated financial statements included in this Form 10-Q.

	Retail Banking									Corporate Banking
	As of and for the Three Months Ended March 31,				Increase (Decrease)					As of and for the Three Months Ended March 31,				Increase (Decrease)
	2013		2012		Amount		Percent			2013		2012		Amount			Percent
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	309	$	268	$	41		15	%	$	355	$	324	$	31			10	%
Noninterest income (expense)		60		56		4		7			157		145		12			8
Total revenue		369		324		45		14			512		469		43			9
Noninterest expense (income)		300		264		36		14			273		236		37			16
Credit expense (income)		6		6		—		—			38		39		(1	)		(3	)
Income (loss) before income taxes and including noncontrolling interests		63		54		9		17			201		194		7			4
Income tax expense (benefit)		25		22		3		14			49		52		(3	)		(6	)
Net income (loss) including noncontrolling interest		38		32		6		19			152		142		10			7
Deduct: Net loss from noncontrolling interests(2)		—		—		—		—			—		—		—			—
Net income (loss) attributable to UNBC	$	38	$	32	$	6		19		$	152	$	142	$	10			7
Average balances—Market View (Dollars in millions):
Total loans held for investment	$	28,898	$	24,557	$	4,341		18		$	33,411	$	30,939	$	2,472			8
Total assets		30,365		25,595		4,770		19			40,021		35,864		4,157			12
Total deposits		31,400		24,838		6,562		26			40,759		34,170		6,589			19

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	Other												Reconciling Items
	As of and for the Three Months Ended March 31,						Increase (Decrease)						As of and for the Three Months Ended March 31,
	2013			2012			Amount			Percent			2013			2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	3		$	69		$	(66	)		(96	)%	$	(19	)	$	(20	)
Noninterest income (expense)		53			28			25			89			(15	)		(15	)
Total revenue		56			97			(41	)		(42	)		(34	)		(35	)
Noninterest expense (income)		153			126			27			21			(13	)		(12	)
Credit expense (income)		(47	)		(46	)		(1	)		(2	)		—			—
Income (loss) before income taxes and including noncontrolling interests		(50	)		17			(67	)		(394	)		(21	)		(23	)
Income tax expense (benefit)		(15	)		(14	)		(1	)		(7	)		(9	)		(9	)
Net income (loss) including noncontrolling interest		(35	)		31			(66	)		(213	)		(12	)		(14	)
Deduct: Net loss from noncontrolling interests (1)		4			4			—			—			—			—
Net income (loss) attributable to UNBC	$	(31	)	$	35		$	(66	)		(189	)	$	(12	)	$	(14	)
Average balances—Market View (Dollars in millions):
Total loans held for investment	$	441		$	845		$	(404	)		(48	)	$	(2,197	)	$	(2,192	)
Total assets		28,508			30,222			(1,714	)		(6	)		(2,245	)		(2,232	)
Total deposits		4,615			7,798			(3,183	)		(41	)		(2,518	)		(2,381	)
	UnionBanCal Corporation
	As of and for the Three Months Ended March 31,						Increase (Decrease)
	2013			2012			Amount			Percent
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	648		$	641		$	7			1	%
Noninterest income (expense)		255			214			41			19
Total revenue		903			855			48			6
Noninterest expense (income)		713			614			99			16
Credit expense (income)		(3	)		(1	)		(2	)		(200	)
Income (loss) before income taxes and including noncontrolling interests		193			242			(49	)		(20	)
Income tax expense (benefit)		50			51			(1	)		(2	)
Net income (loss) including noncontrolling interest		143			191			(48	)		(25	)
Deduct: Net loss from noncontrolling interests (1)		4			4			—			—
Net income (loss) attributable to UNBC	$	147		$	195		$	(48	)		(25	)
Average balances—Market View (Dollars in millions):
Total loans held for investment	$	60,553		$	54,149		$	6,404			12
Total assets		96,649			89,449			7,200			8
Total deposits		74,256			64,425			9,831			15

⁽¹⁾ Reflects net loss attributed to noncontrolling interest related to our consolidated VIEs.

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Retail Banking

Retail Banking provides deposit and lending products delivered through our branches and relationship managers to individuals and small businesses. Retail Banking is focused on executing a strategy to identify targeted opportunities within the consumer and small business markets, and develop product, marketing and sales strategies to attract new customers in these identified target markets.

Retail Banking is comprised of two major divisions:

• the Community Banking Division serves its customers through 380 full-service branches in California and 48 full-service branches in Washington and Oregon. Customers may also access our services 24 hours-a-day by telephone or through our website at www.unionbank.com. In addition, the branches offer automated teller and point-of-sale merchant services.

The Community Banking Division is organized geographically and serves its customers in the following ways:

— through banking branches and ATMs, which serve consumers and businesses with checking and deposit products and services, as well as various types of consumer financing and investment services;

— through its call centers and internet banking services, which augment its physical delivery channels by providing an array of customer transaction, bill payment and loan payment services; and

— through alliances with other financial institutions, the Community Banking Division offers additional products and services, such as credit cards and merchant services.

• the Consumer Lending Division provides the centralized origination, underwriting, processing, servicing, collection and administration for consumer assets including residential mortgages.

Residential mortgage loans are originated and secured by one-to-four family residential properties, through our multiple channel network (including branches, private bankers, mortgage brokers, and telephone centers) throughout California, Oregon and Washington. Additionally we periodically purchase loans in our market area. We hold the majority of the loans we originate.

At March 31, 2013, 62 percent of our residential mortgage loans have current payment terms in which the monthly payment covers the full amount of interest due, but does not reduce the principal balance. At origination, these interest-only loans had strong credit profiles and had weighted average loan-to-value (LTV) ratios of approximately 66 percent. The remainder of the portfolio consists of regularly amortizing loans and a small amount of balloon loans. Refer to Note 4 of our consolidated financial statements included in this Form 10-Q for additional information on refreshed Fair Isaac Corporation (FICO) scores and refreshed LTV ratios for our residential mortgage loans at March 31, 2013.

We do not have a program for originating or purchasing subprime loan products. The Bank’s “no doc” and “low doc” loan origination programs were discontinued in 2008, except for a streamlined refinance process for existing Bank mortgages that was discontinued in 2011. At March 31, 2013, the outstanding balances of the “no doc” and “low doc” portfolios were approximately 32 percent of our total residential loan portfolio. At March 31, 2013, the aggregate balance of “no doc” and “low doc” loans past due 30 days or more was $132 million, compared with $154 million at December 31, 2012. These loan delinquency rates remained below the industry average for California prime loans.

Home equity and other consumer loans are originated principally through our branch network and Private Banking offices. We had approximately 34 percent of these home equity loans and lines supported by first liens on residential properties at both March 31, 2013 and December 31, 2012. To manage risk associated with lending commitments, we review all equity-secured lines annually for creditworthiness and reduce or freeze limits, to the extent permitted by laws and regulations.

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During the first quarter of 2013, net income for Retail Banking increased 19 percent compared with the first quarter of 2012, resulting from a 15 percent increase in net interest income, partially offset by a 14 percent increase in noninterest expense. The increases in net interest income and noninterest expense were primarily related to our PCBC acquisition. Average asset growth in the first quarter of 2013 compared with the same period in 2012 was primarily driven by an 18 percent increase in average loans held for investment, mainly in residential mortgages, reflecting both our PCBC acquisition and organic loan growth. Average deposits increased 26 percent during the first quarter of 2013 compared with the same period in 2012, primarily due to our PCBC acquisition. Retail Banking continues to focus on marketing activities to attract new consumer and small business deposits, customer cross-sell, and relationship management.

Corporate Banking

Corporate Banking offers a range of financial products to U.S.-based middle-market and corporate businesses. Corporate Banking focuses its activities on certain specialized industries, such as power and utilities, oil and gas, real estate, healthcare, equipment leasing and commercial finance, as well as lending in U.S. regional markets. Corporate Banking relationship managers provide credit services including commercial loans, accounts receivable and inventory financing, project financing, trade financing and real estate financing. In addition to credit services, Corporate Banking offers its customers a range of noncredit services, which include global treasury management solutions, capital market, foreign exchange and various interest rate risk and commodity risk management products. These products are delivered through treasury relationship managers and product specialists with expertise in the industry segments described above.

One of the primary strategies of our Corporate Banking business units is to target industries and companies for which we can reasonably expect to be one of our customers’ preferred banks. Consistent with this strategy, Corporate Banking attempts to serve a large part of the targeted customers’ credit and depository needs. Corporate Banking competes with other banks primarily on the basis of the quality of our relationship managers, the level of industry expertise, the delivery of quality customer service, and our reputation as a commercial lending institution. We also compete with a variety of other financial services companies as well as non-bank companies. Competitors include other major California banks, as well as regional, national and international banks. In addition, we compete with investment banks, commercial finance companies, leasing companies and insurance companies.

Corporate Banking initiatives continue to expand commercial and loan relationship strategies that include originating, underwriting and syndicating loans in core competency markets, such as in our West Coast commercial lending markets, as well as our national specialty markets, including real estate, energy, equipment leasing and commercial finance.

Corporate Banking is comprised of the following main divisions:

• the Commercial Banking Division, which includes the following operating units:

— Commercial Banking, which provides commercial lending products and treasury management services to middle-market and corporate companies primarily in California, Oregon and Washington;

— Power and Utilities, which provides treasury management products and commercial lending products, including commercial lines of credit and project financing, to independent power producers as well as regulated utility companies;

— Petroleum, which provides commercial lending products, including reserve-based lines of credit, commercial lines of credit as well as treasury management products, to oil and gas companies;

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— National Banking, which provides commercial lending and treasury management products to corporate clients on a national basis, in states outside of California, Oregon, and Washington. National Banking also targets certain defined industries, such as entertainment and technology; and

— Specialized Industries, which provides commercial lending and treasury products to middle-market and corporate clients in specific industries on a national basis, including commercial finance, funds finance, environmental services, non-profits, healthcare, aerospace and defense.

• the Real Estate Industries Division serves professional real estate investors and developers with products such as construction loans, commercial mortgages and bridge financing. Additionally, through our Community Development Finance unit, we make tax credit investments in affordable housing projects, as well as provide construction and permanent financing;

• the Global Capital Markets Division helps to serve our customers with their foreign exchange, interest rate and energy risk management needs in addition to facilitating merchant and investment banking related transactions. The division takes market risk when buying and selling securities, interest rate derivatives and foreign exchange contracts for its own account and accepts limited market risk when providing commodity and equity derivative contracts, since a significant portion of the market risk for these products is offset with third parties. Additionally, the division’s leasing arm provides lease and other financing services to corporate customers;

• the Global Treasury Management Division targets numerous industry relationship markets with deep industry and product expertise. The Global Treasury Management Division provides working capital solutions to meet deposit, investment and global treasury management services to businesses of all sizes. This division manages Union Bank’s web strategies for retail, small business, wealth management and commercial clients, as well as commercial product development. Effective February 1, 2012, the labor management trust services, retirement plan services and registered investment advisor services were sold to US Bank. The corresponding assets and systems for these business units were converted during the third quarter of 2012. The client base of Global Trust Services consists of financial institutions, corporations, government agencies, insurance companies, mutual funds, investment managers and non-profit organizations. Institutional custody provides both domestic and international asset portfolio safekeeping and settlement services in addition to money markets and liquidity management products. Corporate Trust acts as agent or trustee for corporate and municipal debt issues, and provides escrow and project finance agent services; and

• the Wealth Markets Division consists of the following operating units:

— The Private Bank focuses primarily on delivering financial services to high net worth individuals with sophisticated financial needs as well as to professional service firms, foundations and endowments. Specific products and services include trust and estate services, financial planning, investment account management services, and deposit and credit products;

— UnionBanc Investment Services LLC (UBIS) is a subsidiary of Union Bank and is our registered broker-dealer and registered investment advisor. UBIS provides services to retail and institutional clients in several core products areas, including annuities, mutual funds, and fixed income products. Retail services are delivered through dedicated investment specialists located throughout the Bank’s geographical footprint. Institutional services are delivered through a dedicated trading desk and sales force specializing in fixed income products; and

— Asset Management, which consists of HighMark Capital Management, Inc., a subsidiary of Union Bank and a registered investment advisor, provides investment management and advisory services to institutional clients as well as investment advisory services to the affiliated

30

HighMark Funds. It also provides investment management services to Union Bank with respect to most of its trust and agency clients, including corporations, pension funds and individuals.

Commercial and industrial loans are extended principally to corporations, middle-market businesses and small businesses and are originated primarily through our commercial banking offices. These offices, which rely extensively on relationship-oriented banking, provide a variety of services including cash management, lines of credit, accounts receivable and inventory financing. Separately, we originate or participate in a variety of financial services to major corporations. These services include traditional commercial banking and specialized financing tailored to the needs of each customer’s specific industry. We are active in, among other sectors, power and utilities, oil and gas, manufacturing, finance and insurance services, wholesale trade, real estate and leasing, and communications. These industries comprise the majority of our commercial and industrial portfolio. While loans extended within these sectors comprise the majority of our commercial and industrial portfolio, no individual industry sector exceeded 10 percent of our total loans held for investment at either March 31, 2013 or December 31, 2012.

Construction and commercial mortgage loans are secured by deeds of trust. Construction loans are extended primarily to commercial property developers and to residential builders. Geographically, 76 percent of the construction loan portfolio was domiciled in California as of March 31, 2013. The commercial mortgage loan portfolio consists of loans secured by commercial income properties, 80 percent of which are to borrowers located in California, 6 percent in Washington, and the remaining 14 percent in various other states.

Lease financing includes either direct financing leases, where the assets leased are acquired without additional financing from other sources, or leveraged leases, where a substantial portion of the financing is provided by debt with no recourse to us. At March 31, 2013, we had leveraged leases of $664 million, which were net of non-recourse debt of approximately $1.0 billion. In accordance with accounting guidance for leveraged leases, the gross lease receivable is offset by the qualifying non-recourse debt. In leveraged lease transactions, the third-party lender may only look to the collateral value of the leased assets for repayment in the event of lessee default.

During the first quarter of 2013, net income for Corporate Banking increased 7 percent, compared with the first quarter of 2012, primarily resulting from a 10 percent increase in net interest income and an 8 percent increase in noninterest income. The increase in net interest income was primarily the result of strong asset growth, as well as our PCBC acquisition. The increase in noninterest income included gains on the sale of lease financings, partially offset by lower trading income. During the first quarter of 2013, average deposits increased 19 percent compared with the same period in 2012, primarily due to a 22 percent increase in noninterest bearing deposits and an 18 percent increase in interest bearing deposits, reflecting the impact of our PCBC and Smartstreet acquisitions.

Other

“Other” includes the following:

• The Pacific Rim Corporate Group, which offers a range of credit, deposit, and investment management products and services to companies located primarily in the U.S. that are affiliated with companies headquartered in Japan and other Asian countries;

• the funds transfer pricing results for our entire company, which allocates to the business segments their cost of funds on all asset categories and credit for funds on all liability categories;

• Corporate Treasury, which is responsible for our ALM, wholesale funding and the ALM investment and derivatives hedging portfolios. These Treasury management activities are carried out to manage the net interest rate and liquidity risks of our balance sheet and to manage those risks within the guidelines established by ALCO. For additional discussion regarding these risk management

31

activities, see “Quantitative and Qualitative Disclosures About Market Risk” in Part I, Item 2 of this Form 10-Q;

• the adjustment between the credit expense (income) under the expected credit loss allocation methodology and (reversal of) provision for credit losses under U.S. GAAP;

• the residual costs of support groups;

• corporate activities that are not directly attributable to one of the two business segments. Included in this category are certain other items such as the results of operations of certain subsidiaries of UnionBanCal, and the elimination of the fully taxable-equivalent basis amount;

• goodwill, intangible assets, and related amortization/accretion associated with our privatization transaction;

• the FDIC covered assets; and

• the adjustment between the tax expense calculated using the adjusted statutory tax rate of 39.29 percent and our consolidated effective tax rate.

The decrease in net income of $66 million for the first quarter of 2013 compared with the first quarter of 2012 is primarily due to the following factors:

• a decrease in net interest income of $66 million, reflecting the loss of interest income on securities that were sold as part of the Company’s portfolio rebalancing activities, as well as an increase in interest expense on interest bearing money market deposits.

• an increase in noninterest expense of $27 million, including a $15 provision for losses on off-balance sheet commitments in the first quarter of 2013, compared with a benefit of $2 million in the first quarter of 2012.

• an increase in noninterest income of $25 million, primarily as a result of a $77 million increase in gains on the sale of securities, reflecting securities portfolio rebalancing activities. The increase was partially offset by a $24 million gain on the sale of certain business units related to productivity initiatives in the first quarter of 2012 and a $13 million decrease in indemnification asset accretion, driven by better than expected FDIC covered loans performance, in the first quarter of 2013.

Critical Accounting Estimates

UnionBanCal Corporation’s consolidated financial statements are prepared in accordance with U.S. GAAP, which include management estimates and judgments. The financial information contained within our statements is, to a significant extent, financial information that is based on approximate measures of the financial effects of transactions and events that have already occurred. A variety of factors could affect the ultimate value that is obtained either when earning income, recognizing an expense, recovering an asset or relieving a liability. For example, we use discount factors and other assumptions to measure certain assets and liabilities. A change in the discount factor or other important assumptions could significantly increase or decrease the reported amounts of those assets and liabilities and result in either a beneficial or an adverse impact to our financial results. We use historical loss factors, adjusted for current conditions, to estimate the credit loss inherent in our loan and lease portfolios held for investment and certain off-balance sheet commitments on the balance sheet date. Actual losses could differ significantly from the loss factors that we use. Other significant estimates that we use include the valuation of certain derivatives and securities, the expected cash flows related to our acquired loans and FDIC indemnification asset, the assumptions used in measuring our pension obligations, and assumptions regarding our effective tax rates.

For each financial reporting period, our most significant estimates are presented to and discussed with the Audit & Finance Committee of our Board of Directors.

32

Understanding our accounting policies is fundamental to understanding our consolidated financial condition and consolidated results of operations. Accordingly, both our critical accounting estimates and our significant accounting policies are discussed in detail in our 2012 Form 10-K. There have been no material changes to these critical accounting estimates during the first quarter of 2013.

Disclosure of Iranian Activities under Section 13(r) of the Securities Exchange Act of 1934

We are disclosing the following information pursuant to Section 13(r) of the Securities Exchange Act of 1934 (Exchange Act), which requires an issuer to disclose whether it or any of its affiliates knowingly engaged in certain activities, transactions or dealings relating to Iran or with natural persons or entities designated by the U.S. government under specified statutory provisions, regulations or Executive Orders, including activities not prohibited by U.S. law and conducted outside the United States by non-U.S. affiliates in compliance with local law. Because we are indirectly wholly-owned by MUFG, a Japanese corporation, our disclosure includes activities, transactions or dealings conducted outside the United States by non-U.S. affiliates of MUFG which are not controlled by us. MUFG is subject to the disclosure requirements of Section 13(r) for its Form 20-F for the year ending March 31, 2013. In advance of that filing, we have requested that MUFG provide us a detailed description of reportable activity under Section 13(r) and have received the following information:

During the quarter ended March 31, 2013, a non-U.S. affiliate of MUFG engaged in business activities with entities in or affiliated with Iran, including counterparties owned or controlled by the Iranian government. These activities were consistent with rules and regulations applicable to MUFG’s non-U.S. affiliate. Specifically, MUFG’s non-U.S. banking subsidiary, BTMU, issued letters of credit and guarantees and provided remittance and other settlement services in connection with petroleum-related transactions with Iran by its customers. These transactions, however, did not involve clearing services of U.S. banks for the settlement of payments. For the quarter ended March 31, 2013, the aggregate interest and fee income relating to these transactions was less than ¥50 million, representing less than 0.01 percent of MUFG’s total interest and fee income. Some of these transactions were conducted through the use of correspondent accounts and other similar settlement accounts maintained with BTMU by Iranian financial institutions and other entities in or affiliated with Iran. In addition to such accounts, BTMU receives deposits in Japan from fewer than 10 Iranian government-related entities and fewer than 100 Iranian government-related individuals, and maintains settlement accounts outside the United States for certain other financial institutions specified in Executive Order 13382, which settlement accounts were frozen in accordance with applicable laws and regulations. For the quarter ended March 31, 2013, the average aggregate balance of deposits held in the settlement accounts and other accounts by Iranian government-related entities and individuals represented less than 0.005 percent of the average balance of MUFG’s total deposits. The fee income from the transactions attributable to these accounts was less than ¥1 million, representing less than 0.001 percent of MUFG’s total fee income. BTMU also had loan transactions arranged prior to changes in applicable laws and regulations to borrowers in or affiliated with Iran, including entities owned by the Iranian government, the outstanding balance of which was approximately ¥500 million, representing less than 0.001 percent of MUFG’s total loans, as of March 31, 2013. For the quarter ended March 31, 2013, the aggregate gross interest and fee income relating to these loan transactions was less than ¥20 million, representing less than 0.005 percent of MUFG’s total interest and fee income. MUFG plans to continue to engage in the above types of transactions to the extent permitted under applicable regulations.

As of the date of this report, to our knowledge, there are no other activities, transactions or dealings by us during the quarter ended March 31, 2013 that require disclosure in this Form 10-Q under Section 13(r) of the Exchange Act. For affiliates that we do not control and that are or may be our affiliates solely due to their possible common control by our parent MUFG, we have relied upon MUFG for information regarding their activities, transactions and dealings.

33

Item 3. Quantitative and Qualitative Disclosures About Market Risk

A discussion of our market risk exposure is incorporated by reference to Part I, Item 2 of this Form 10-Q under the caption “Quantitative and Qualitative Disclosures About Market Risk” and to Part II, Item 1A of this Form 10-Q under the caption “Risk Factors.”

Item 4. Controls and Procedures

Disclosure Controls and Procedures. Our Chief Executive Officer (principal executive officer) and Chief Financial Officer (principal financial officer) have concluded that the design and operation of our disclosure controls and procedures are effective as of March 31, 2013. This conclusion is based on an evaluation conducted under the supervision, and with the participation, of management. Disclosure controls and procedures are those controls and procedures that are designed to ensure that information required to be disclosed in this filing is recorded, processed, summarized and reported in a timely manner and in accordance with the SEC’s rules and regulations and to ensure that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Internal Control Over Financial Reporting. During the first quarter of 2013, there were no changes in our internal control over financial reporting that materially affected, or were reasonably likely to materially affect, our internal control over financial reporting.

34

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

UnionBanCal Corporation and Subsidiaries

Consolidated Statements of Income

(Unaudited)

	For the Three Months Ended March 31,
(Dollars in millions)	2013			2012
Interest Income
Loans	$	629		$	594
Securities		118			142
Interest income—other		3			2
Total interest income		750			738
Interest Expense
Deposits		65			58
Long-term debt		36			36
Commercial paper and other short-term borrowings		1			3
Total interest expense		102			97
Net Interest Income		648			641
(Reversal of) provision for loan losses		(3	)		(1	)
Net interest income after (reversal of) provision for loan losses		651			642
Noninterest Income
Service charges on deposit accounts		53			55
Trust and investment management fees		35			30
Trading account activities		8			31
Securities gains, net		96			19
Credit facility fees		26			25
Merchant banking fees		16			23
Brokerage commissions and fees		12			10
Card processing fees, net		9			8
Other, net		—			13
Total noninterest income		255			214
Noninterest Expense
Salaries and employee benefits		421			364
Net occupancy and equipment		75			68
Professional and outside services		58			46
Intangible asset amortization		16			21
Regulatory assessments		20			18
(Reversal of) provision for losses on off-balance sheet commitments		15			(2	)
Other		108			99
Total noninterest expense		713			614
Income before income taxes and including noncontrolling interests		193			242
Income tax expense		50			51
Net Income Including Noncontrolling Interests		143			191
Deduct: Net loss from noncontrolling interests		4			4
Net Income Attributable to UnionBanCal Corporation (UNBC)	$	147		$	195

See accompanying notes to consolidated financial statements.

35

UnionBanCal Corporation and Subsidiaries

Consolidated Statements of Comprehensive Income

(Unaudited)

	For the Three Months Ended March 31,
(Dollars in millions)	2013			2012
Net Income Attributable to UNBC	$	147		$	195
Other Comprehensive Income (Loss), Net of Tax:
Net change in unrealized gains/losses on cash flow hedges		—			5
Net change in unrealized gains/losses on investment securities		(64	)		39
Foreign currency translation adjustment		(1	)		1
Net change in pension and other benefits		18			16
Total other comprehensive (loss) income		(47	)		61
Comprehensive Income Attributable to UNBC		100			256
Comprehensive loss from noncontrolling interests		(4	)		(4	)
Total Comprehensive Income	$	96		$	252

See accompanying notes to consolidated financial statements.

36

UnionBanCal Corporation and Subsidiaries

Consolidated Balance Sheets

(Unaudited)

(Dollars in millions except for per share amount)	March 31, 2013			December 31, 2012
Assets
Cash and due from banks	$	1,265		$	1,845
Interest bearing deposits in banks		3,776			3,477
Federal funds sold and securities purchased under resale agreements		50			169
Total cash and cash equivalents		5,091			5,491
Trading account assets (includes $40 at March 31, 2013 and $1 at December 31, 2012 of assets pledged as collateral)		1,119			1,208
Securities available for sale		21,801			21,352
Securities held to maturity (Fair value: March 31, 2013, $1,036; December 31, 2012, $1,135)		1,015			1,103
Loans held for investment		60,882			60,034
Allowance for loan losses		(638	)		(653	)
Loans held for investment, net		60,244			59,381
Premises and equipment, net		707			710
Intangible assets		339			376
Goodwill		2,952			2,942
FDIC indemnification asset		285			338
Other assets		3,406			4,091
Total assets	$	96,959		$	96,992
Liabilities
Deposits:
Noninterest bearing	$	24,679		$	25,478
Interest bearing		49,311			48,777
Total deposits		73,990			74,255
Commercial paper and other short-term borrowings		2,228			1,363
Long-term debt		5,314			5,622
Trading account liabilities		742			895
Other liabilities		1,821			2,102
Total liabilities		84,095			84,237
Commitments, contingencies and guarantees—See Note 12
Equity
UNBC stockholder’s equity:
Preferred stock:
Authorized 5,000,000 shares; no shares issued or outstanding		—			—
Common stock, par value $1 per share:
Authorized 300,000,000 shares, 136,330,830 shares issued and outstanding as of March 31, 2013 and December 31, 2012		136			136
Additional paid-in capital		5,997			5,994
Retained earnings		7,022			6,875
Accumulated other comprehensive loss		(561	)		(514	)
Total UNBC stockholder’s equity		12,594			12,491
Noncontrolling interests		270			264
Total equity		12,864			12,755
Total liabilities and equity	$	96,959		$	96,992

See accompanying notes to consolidated financial statements.

37

UnionBanCal Corporation and Subsidiaries

Consolidated Statements of Changes in Stockholder’s Equity

(Unaudited)

	UNBC Stockholder’s Equity
(in millions, except shares)	Common Stock		Additional Paid-in Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests			Total Stockholder’s Equity
Balance December 31, 2011	$	136	$	5,989	$	6,246	$	(809	)	$	268		$	11,830
Net income (loss)						195					(4	)		191
Other comprehensive income (loss), net of tax								61						61
Compensation expense—restricted stock units				3										3
Other											(3	)		(3	)
Net change		—		3		195		61			(7	)		252
Balance March 31, 2012	$	136	$	5,992	$	6,441	$	(748	)	$	261		$	12,082
Balance December 31, 2012	$	136	$	5,994	$	6,875	$	(514	)	$	264		$	12,755
Net income (loss)						147					(4	)		143
Other comprehensive income (loss), net of tax								(47	)					(47	)
Compensation expense—restricted stock units				3										3
Other											10			10
Net change		—		3		147		(47	)		6			109
Balance March 31, 2013	$	136	$	5,997	$	7,022	$	(561	)	$	270		$	12,864

See accompanying notes to consolidated financial statements.

38

UnionBanCal Corporation and Subsidiaries

Consolidated Statements of Cash Flows

(Unaudited)

	For the Three Months Ended March 31,
(Dollars in millions)	2013			2012
Cash Flows from Operating Activities:
Net income including noncontrolling interests	$	143		$	191
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Reversal of) provision for loan losses		(3	)		(1	)
(Reversal of) provision for losses on off-balance sheet commitments		15			(2	)
Depreciation, amortization and accretion, net		128			108
Stock-based compensation—restricted stock units		3			3
Deferred income taxes		(18	)		(114	)
Net gains on sales of securities		(96	)		(19	)
Net decrease (increase) in trading account assets		89			(43	)
Net decrease (increase) in other assets		300			45
Net increase (decrease) in trading account liabilities		(153	)		(117	)
Net increase (decrease) in other liabilities		(476	)		(34	)
Loans originated for sale		(34	)		(2	)
Net proceeds from sale of loans originated for sale		43			1
Other, net		15			(1	)
Total adjustments		(187	)		(176	)
Net cash provided by (used in) operating activities		(44	)		15
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale		5,098			1,251
Proceeds from matured and called securities available for sale		1,043			1,447
Purchases of securities available for sale		(6,018	)		(3,991	)
Proceeds from matured securities held to maturity		93			17
Purchases of premises and equipment		(29	)		(23	)
Proceeds from sales of loans		160			114
Net decrease (increase) in loans		(1,009	)		(924	)
Proceeds from FDIC loss share agreements		3			—
Other, net		(7	)		—
Net cash provided by (used in) investing activities		(666	)		(2,109	)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits		(265	)		669
Net increase (decrease) in commercial paper and other short-term borrowings		865			2,997
Repayment of long-term debt		(300	)		(1,125	)
Change in noncontrolling interests		10			(3	)
Net cash provided by (used in) financing activities		310			2,538
Net change in cash and cash equivalents		(400	)		444
Cash and cash equivalents at beginning of period		5,491			4,195
Cash and cash equivalents at end of period	$	5,091		$	4,639
Cash Paid (Received) During the Period For:
Interest	$	80		$	92
Income taxes, net		(27	)		24
Supplemental Schedule of Noncash Investing and Financing Activities:
Net transfer of loans held for investment to loans held for sale		148			83
Securities available for sale transferred to securities held to maturity		—			155
Transfer of loans held for investment to other real estate owned assets (OREO)		8			31

See accompanying notes to consolidated financial statements.

39

Note 1—Summary of Significant Accounting Policies and Nature of Operations

The unaudited consolidated financial statements of UnionBanCal Corporation, its subsidiaries, and its consolidated variable interest entities (the Company) have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial reporting and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Rules and Regulations of the Securities and Exchange Commission (SEC). However, they do not include all of the disclosures necessary for annual financial statements. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation have been included. The results of operations for the first quarter of 2013 are not necessarily indicative of the operating results anticipated for the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in UnionBanCal Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012 (2012 Form 10-K).

The preparation of financial statements in conformity with U.S. GAAP also requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Although such estimates contemplate current conditions and management’s expectations of how they may change in the future, it is reasonably possible that actual results could differ significantly from those estimates. This could materially affect the Company’s results of operations and financial condition in the near term. Significant estimates made by management in the preparation of the Company’s financial statements include, but are not limited to, the evaluation of other-than-temporary impairment on investment securities (Note 3), allowance for credit losses (Note 4), purchased credit-impaired loans (Note 4), annual goodwill impairment analysis, pension accounting (Note 6), fair value of financial instruments (Note 9), and income taxes.

UnionBanCal Corporation is a financial holding company and bank holding company whose principal subsidiary is Union Bank, N.A. (the Bank). The Company provides a wide range of financial services to consumers, small businesses, middle-market companies and major corporations, primarily in California, Oregon, Washington, Texas, New York, and Illinois, as well as nationally and internationally.

During the first quarter of 2013, fees based on certain unused commitment balances are classified within credit facility fees. These fees were previously recorded in net interest income and totaled $12 million for the quarter ended March 31, 2012.

Recently Issued Accounting Pronouncements That Are Not Yet Effective

Obligations Resulting from Joint and Several Liability Arrangement for Which the Total Amount of the Obligation Is Fixed at the Reporting Date

In February 2013, the FASB issued ASU 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date, which provides guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. Examples of obligations within the scope of this guidance include debt arrangements, other contractual obligations, and settled litigation and judicial rulings. This guidance is effective for interim and annual periods beginning on January 1, 2014 and must be retroactively applied to prior periods presented. Early adoption is permitted. Management is currently assessing the impact of this guidance to the Company’s financial position and results of operations.

Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity

In March 2013, the FASB issued ASU 2013-05, Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of

40

Note 1—Summary of Significant Accounting Policies and Nature of Operations (Continued)

an Investment in a Foreign Entity, which provides guidance on releasing cumulative translation adjustments out of accumulated comprehensive income when a parent deconsolidates or derecognizes a subsidiary or group of assets that is a not for profit activity or a business within a foreign entity or deconsolidates or derecognizes investments in a foreign entity. This guidance is effective prospectively for interim and annual periods beginning on January 1, 2014. Early adoption is permitted. Management does not expect the adoption of this guidance to significantly impact the Company’s financial position or results of operations.

Note 2—Business Combinations

On December 1, 2012, the Company completed its acquisition of Pacific Capital Bancorp (PCBC), a bank holding company headquartered in Santa Barbara, California, for $1.5 billion in cash.

The assets acquired and liabilities assumed from PCBC were recorded at their estimated fair values on the acquisition date. These fair value estimates are considered provisional, as additional analysis will be performed on certain assets and liabilities in which fair values were primarily determined through the use of inputs that were not observable from market-based information. During the first quarter of 2013, management reviewed and, where necessary, adjusted the acquisition date fair values for circumstances that existed as of the acquisition date. Management may further adjust the provisional fair values for a period of up to one year from the date of acquisition. The assets and liabilities that continue to be provisional include loans, intangible assets, OREO, and the residual effects the adjustments would have on goodwill.

The following table presents the net assets acquired from PCBC and the estimated purchase accounting adjustments, which include the effects of measurement period adjustments that were applied to the acquisition date fair values during the first quarter of 2013. These adjustments increased goodwill by $10 million.

(Dollars in millions)	December 1, 2012			Adjustments			December 1, 2012 (adjusted)
Purchase price	$	1,516		$	—		$	1,516
Net assets acquired		859			—			859
Purchase accounting adjustments:
Securities available for sale		8			—			8
Loans held for investment		141			5			146
Intangible assets		18			(19	)		(1	)
Other assets		128			8			136
Deposits		(12	)		—			(12	)
Other short-term borrowings		(36	)		—			(36	)
Long-term debt		(14	)		4			(10	)
Other liabilities		11			(8	)		3
Total purchase accounting adjustments		244			(10	)		234
Fair value of net assets acquired		1,103			(10	)		1,093
Goodwill	$	413		$	10		$	423

41

Note 2—Business Combinations (Continued)

For further information related to the PCBC acquisition, see Note 2 to the consolidated financial statements in the Company’s 2012 Form 10-K. For further information related to goodwill, see Note 5 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Acquisition of PB Capital

On April 7, 2013, the Company announced that it reached an agreement to acquire PB Capital Corporation’s (PB Capital) institutional commercial real estate (CRE) lending division. The acquisition will expand the Company’s CRE presence in the U.S., and provide geographic and asset class diversification. Headquartered in New York, the CRE lending division of PB Capital has approximately $3.7 billion in loans outstanding on properties in major metropolitan areas across the U.S. The acquisition is subject to certain customary closing conditions and is expected to be completed in the second quarter of 2013.

Note 3—Securities

Securities Available for Sale

At March 31, 2013 and December 31, 2012, the amortized cost, gross unrealized gains, gross unrealized losses, and fair values of securities are presented below.

	March 31, 2013
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government sponsored agencies	$	468	$	4	$	—	$	472
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies		13,172		124		15		13,281
Privately issued		358		7		3		362
Commercial mortgage-backed securities		3,500		84		21		3,563
Collateralized loan obligations (CLOs)		2,296		16		10		2,302
Asset-backed and other		99		1		—		100
Asset Liability Management securities		19,893		236		49		20,080
Other debt securities:
Direct bank purchase bonds		1,557		31		56		1,532
Other		154		8		4		158
Equity securities		30		1		—		31
Total securities available for sale	$	21,634	$	276	$	109	$	21,801

42

Note 3—Securities (Continued)

	December 31, 2012
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government-sponsored agencies	$	866	$	19	$	—	$	885
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies		13,104		232		3		13,333
Privately issued		445		8		10		443
Commercial mortgage-backed securities		2,863		114		6		2,971
CLOs		1,996		7		44		1,959
Asset-backed and other		145		1		—		146
Asset Liability Management securities		19,419		381		63		19,737
Other debt securities:								—
Direct bank purchase bonds		1,482		27		71		1,438
Other		156		6		4		158
Equity securities		19		—		—		19
Total securities available for sale	$	21,076	$	414	$	138	$	21,352

The Company’s securities available for sale with a continuous unrealized loss position at March 31, 2013 and December 31, 2012 are shown below, identified for periods less than 12 months and 12 months or more.

	March 31, 2013
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies	$	3,693	$	15	$	1	$	—	$	3,694	$	15
Privately issued		21		—		139		3		160		3
Commercial mortgage-backed securities		1,637		21		—		—		1,637		21
CLOs		262		2		309		8		571		10
Asset Liability Management securities		5,613		38		449		11		6,062		49
Other debt securities:
Direct bank purchase bonds		1,028		56		—		—		1,028		56
Other		6		1		39		3		45		4
Total securities available for sale	$	6,647	$	95	$	488	$	14	$	7,135	$	109

43

Note 3—Securities (Continued)

	December 31, 2012
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies	$	1,152	$	3	$	13	$	—	$	1,165	$	3
Privately issued		32		—		137		10		169		10
Commercial mortgage-backed securities		675		6		—		—		675		6
CLOs		168		1		980		43		1,148		44
Asset-backed and other		32		—		3		—		35		—
Asset Liability Management securities		2,059		10		1,133		53		3,192		63
Other debt securities:
Direct bank purchase bonds		1,019		71		—		—		1,019		71
Other		34		3		13		1		47		4
Total securities available for sale	$	3,112	$	84	$	1,146	$	54	$	4,258	$	138

At March 31, 2013, the Company did not have the intent to sell any securities in an unrealized loss position before a recovery of the amortized cost, which may be at maturity. The Company also believes that it is more likely than not that it will not have to sell the securities prior to recovery of amortized cost.

Agency residential mortgage-backed securities consist of securities guaranteed by a U.S. government corporation or a government-sponsored enterprise (GSE) such as Fannie Mae, Freddie Mac, and Ginnie Mae. These securities are collateralized by residential mortgage loans and may be prepaid at par prior to maturity. The unrealized losses on agency residential mortgage-backed securities resulted from changes in interest rates and not credit quality. At March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities because the Company determined that the strength of the issuers’ guarantees through direct obligations or support from the U.S. government is sufficient to protect the Company from losses.

Privately issued residential mortgage-backed securities are issued by financial institutions with no guarantee from government sponsored entities. These securities are collateralized by residential mortgage loans and may be prepaid at par prior to maturity. The securities are primarily rated investment grade. The unrealized losses on privately issued residential mortgage-backed securities resulted from declining credit quality of underlying collateral and additional credit spread widening since purchase. The Company estimated loss projections for each security by assessing the loans collateralizing each security. The Company estimates the portion of loss attributable to credit based on the expected cash flows of the underlying collateral using estimates of current key assumptions, such as default rates, loss severity and prepayment rates. With respect to the remaining portfolio, at March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.

Commercial mortgage-backed securities are collateralized by commercial mortgage loans and are generally subject to prepayment penalties. The unrealized losses on commercial mortgage-backed securities resulted from higher market yields since purchase. The Company estimated loss projections for each security by assessing the loans collateralizing each security. The Company estimates the portion of loss attributable to credit based on the expected cash flows of the underlying collateral using estimates of current key assumptions, such as default rates, loss severity and prepayment rates. Based on the analysis performed as of March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.

The Company’s CLOs consist of Cash Flow CLOs. A Cash Flow CLO is a structured finance product that securitizes a diversified pool of loan assets into multiple classes of notes. Cash Flow CLOs pay the

44

Note 3—Securities (Continued)

note holders through the receipt of interest and principal repayments from the underlying loans unlike other types of CLOs that pay note holders through the trading and sale of underlying collateral. Unrealized losses typically arise from widening credit spreads and deteriorating credit quality of the underlying collateral. Cash flow analysis of the underlying collateral provides an estimate of other-than-temporary impairment, which is performed quarterly when the fair value of a security is lower than its amortized cost. Based on the analysis performed as of March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.

Other debt securities primarily consist of direct bank purchase bonds, which are not rated. The unrealized losses on these bonds resulted from a higher return on capital expected by the secondary market compared with the return on capital required at the time of origination when the bonds were purchased. The Company estimated loss projections for each security by assessing the underlying collateral of each security. The Company estimates the portion of loss attributable to credit based on the expected cash flows of the underlying collateral using estimates of current key assumptions, such as probability of default and loss severity. Cash flow analysis of the underlying collateral provides an estimate of other-than-temporary impairment, which is performed quarterly when the fair value of a security is lower than its amortized cost. Based on the analysis performed as of March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.

The fair value of debt securities available for sale by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.

	March 31, 2013
(Dollars in millions)	One Year or Less		Over One Year Through Five Years		Over Five Years Through Ten Years		Over Ten Years		Total Fair Value
U.S. government sponsored agencies	$	398	$	74	$	—	$	—	$	472
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies		5		45		394		12,837		13,281
Privately issued		—		—		7		355		362
Commercial mortgage-backed securities		—		—		978		2,585		3,563
CLOs		—		559		798		945		2,302
Asset-backed and other		1		90		9		—		100
Asset Liability Management securities		404		768		2,186		16,722		20,080
Other debt securities
Direct bank purchase bonds		74		252		803		403		1,532
Other		—		32		21		105		158
Total debt securities available for sale	$	478	$	1,052	$	3,010	$	17,230	$	21,770

The proceeds from sales of securities available for sale and gross realized gains and losses are shown below. The specific identification method is used to calculate realized gains and losses on sales.

	For the Three Months Ended March 31,
(Dollars in millions)	2013		2012
Proceeds from sales	$	5,098	$	1,251
Gross realized gains		99		19

45

Note 3—Securities (Continued)

Securities Held to Maturity

The securities held to maturity consist of CLOs and U.S. government and government sponsored agencies residential mortgage-backed securities. Management has asserted the positive intent and ability to hold these securities to maturity. At March 31, 2013 and December 31, 2012, the amortized cost, gross unrealized gains and losses recognized in other comprehensive income (OCI), carrying amount, gross unrealized gains and losses not recognized in OCI, and fair values of securities held to maturity are presented below.

	March 31, 2013
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
CLOs	$	75	$	—	$	11	$	64	$	14	$	—	$	78
U.S. government agency and government sponsored agencies—residential mortgage backed securities		947		4		—		951		7		—		958
Total securities held to maturity	$	1,022	$	4	$	11	$	1,015	$	21	$	—	$	1,036

	December 31, 2012
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
CLOs	$	118	$	—	$	17	$	101	$	20	$	—	$	121
U.S. government agency and government sponsored agencies—residential mortgage backed securities		997		5		—		1,002		12		—		1,014
Total securities held to maturity	$	1,115	$	5	$	17	$	1,103	$	32	$	—	$	1,135

For securities held to maturity, the amount recognized in OCI primarily reflects the unrealized gain or loss at date of transfer to the held to maturity classification, net of amortization. Amortized cost is defined as the original purchase cost, adjusted for any accretion or amortization of a purchase discount or premium, less principal payments and any impairment previously recognized in earnings.

The Company’s securities held to maturity with a continuous unrealized loss position at March 31, 2013 and December 31, 2012 are shown below, separately for periods less than 12 months and 12 months or more.

	March 31, 2013
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
CLOs	$	—	$	—	$	—	$	78	$	11	$	—	$	78	$	11	$	—

46

Note 3—Securities (Continued)

	December 31, 2012
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
CLOs	$	—	$	—	$	—	$	121	$	17	$	—	$	121	$	17	$	—

The carrying amount and fair value of securities held to maturity by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.

	March 31, 2013
	Over One Year Through Five Years				Over Ten Years				Total
(Dollars in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
CLOs	$	64	$	78	$	—	$	—	$	64	$	78
U.S. government agency and government sponsored agencies—residential mortgage backed securities		—		—		951		958		951		958
Total securities held to maturity	$	64	$	78	$	951	$	958	$	1,015	$	1,036

Securities Pledged as Collateral

Transactions involving purchases of securities under agreements to resell (reverse repurchase agreements or reverse repos) or sales of securities under agreements to repurchase (repurchase agreements or repos) are accounted for as collateralized financings except where the Company does not have an agreement to sell (or purchase) the same or substantially the same securities before maturity at a fixed or determinable price. The Company’s policy is to obtain possession of collateral with a market value equal to or in excess of the principal amount loaned under resale agreements. Collateral is valued daily, and the Company may require counterparties to deposit additional collateral or return collateral pledged, when appropriate.

The Company separately identifies in the consolidated balance sheets, securities pledged as collateral in secured borrowings and other arrangements when the secured party can sell or repledge the securities. If the secured party cannot resell or repledge the securities that have been placed as collateral, those securities are not separately identified. At March 31, 2013, the Company had $7.0 billion of securities available for sale pledged as collateral where the secured party cannot resell or repledge such securities. These available for sale securities have been pledged to secure borrowings ($0.8 billion), to support unrealized losses on derivative transactions reported in trading liabilities ($0.5 billion) and to secure public and trust deposits ($5.7 billion).

At March 31, 2013 and December 31, 2012, the Company accepted securities as collateral that it is permitted by contract to sell or repledge of $24 million (none of which has been repledged) and $19 million (none of which has been repledged), respectively. These securities were received as collateral for secured lending.

47

Note 4—Loans and Allowance for Loan Losses

The following table provides the outstanding balances of loans at March 31, 2013 and December 31, 2012:

(Dollars in millions)	March 31, 2013			December 31, 2012
Loans held for investment:
Commercial and industrial	$	21,433		$	20,827
Commercial mortgage		9,918			9,939
Construction		659			627
Lease financing		1,060			1,104
Total commercial portfolio		33,070			32,497
Residential mortgage		23,146			22,705
Home equity and other consumer loans		3,542			3,647
Total consumer portfolio		26,688			26,352
Total loans held for investment, before purchased credit-impaired loans		59,758			58,849
Purchased credit-impaired loans(1)		1,124			1,185
Total loans held for investment(2)		60,882			60,034
Allowance for loan losses		(638	)		(653	)
Loans held for investment, net	$	60,244		$	59,381

⁽¹⁾  Includes $376 million and $421 million as of March 31, 2013 and December 31, 2012, respectively, of loans for which the Company will be reimbursed a substantial portion of any future losses under the terms of the FDIC loss share agreements. Of these FDIC covered loans, $21 million and $24 million as of March 31, 2013 and December 31, 2012, respectively, were not accounted for under accounting guidance for loans acquired with deteriorated credit quality.

⁽²⁾  Includes $26 million and $5 million at March 31, 2013 and December 31, 2012, respectively, for net unamortized discounts and premiums and deferred fees and costs.

Allowance for Loan Losses

The following tables provide a reconciliation of changes in the allowance for loan losses by portfolio segment:

	For the Three Months Ended March 31, 2013
(Dollars in millions)	Commercial			Consumer			Purchased Credit- Impaired			Unallocated			Total
Allowance for loan losses, beginning of period	$	418		$	124		$	1		$	110		$	653
(Reversal of) provision for loan losses		68			1			—			(72	)		(3	)
Increase in allowance covered by FDIC indemnification		—			—			2			—			2
Loans charged off		(3	)		(13	)		(3	)		—			(19	)
Recoveries of loans previously charged off		3			1			1			—			5
Allowance for loan losses, end of period	$	486		$	113		$	1		$	38		$	638

48

Note 4—Loans and Allowance for Loan Losses (Continued)

	For the Year Ended December 31, 2012
(Dollars in millions)	Commercial			Consumer			Purchased Credit- Impaired			Unallocated			Total
Allowance for loan losses, beginning of period	$	474		$	138		$	17		$	135		$	764
(Reversal of) provision for loan losses		(25	)		78			—			(25	)		28
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification		—			—			(3	)		—			(3	)
Decrease in allowance covered by FDIC indemnification		—			—			(5	)		—			(5	)
Loans charged off		(88	)		(95	)		(13	)		—			(196	)
Recoveries of loans previously charged off		57			3			5			—			65
Allowance for loan losses, end of period	$	418		$	124		$	1		$	110		$	653

The following tables show the allowance for loan losses and related loan balances by portfolio segment as of March 31, 2013 and December 31, 2012:

	March 31, 2013
(Dollars in millions)	Commercial		Consumer		Purchased Credit- Impaired		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	32	$	17	$	—	$	—	$	49
Collectively evaluated for impairment		454		96		—		38		588
Purchased credit-impaired loans		—		—		1		—		1
Total allowance for loan losses	$	486	$	113	$	1	$	38	$	638
Loans held for investment:
Individually evaluated for impairment	$	315	$	300	$	4	$	—	$	619
Collectively evaluated for impairment		32,755		26,388		—		—		59,143
Purchased credit-impaired loans		—		—		1,120		—		1,120
Total loans held for investment	$	33,070	$	26,688	$	1,124	$	—	$	60,882

	December 31, 2012
(Dollars in millions)	Commercial		Consumer		Purchased Credit- Impaired		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	24	$	18	$	—	$	—	$	42
Collectively evaluated for impairment		394		106		—		110		610
Purchased credit-impaired loans		—		—		1		—		1
Total allowance for loan losses	$	418	$	124	$	1	$	110	$	653
Loans held for investment:
Individually evaluated for impairment	$	330	$	292	$	5	$	—	$	627
Collectively evaluated for impairment		32,167		26,060		—		—		58,227
Purchased credit-impaired loans		—		—		1,180		—		1,180
Total loans held for investment	$	32,497	$	26,352	$	1,185	$	—	$	60,034

49

Note 4—Loans and Allowance for Loan Losses (Continued)

Nonaccrual and Past Due Loans

The following table presents nonaccrual loans as of March 31, 2013 and December 31, 2012:

(Dollars in millions)	March 31, 2013		December 31, 2012
Commercial and industrial	$	49	$	48
Commercial mortgage		57		65
Total commercial portfolio		106		113
Residential mortgage		326		306
Home equity and other consumer loans		59		56
Total consumer portfolio		385		362
Total nonaccrual loans, before purchased credit-impaired loans		491		475
Purchased credit-impaired loans		29		30
Total nonaccrual loans	$	520	$	505
Troubled debt restructured loans that continue to accrue interest	$	372	$	401
Troubled debt restructured nonaccrual loans (included in the total nonaccrual loans above)	$	223	$	209

The following table shows an aging of the balance of loans held for investment, excluding purchased credit-impaired loans, by class as of March 31, 2013 and December 31, 2012:

	March 31, 2013
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	22,415	$	66	$	12	$	78	$	22,493
Commercial mortgage		9,863		38		17		55		9,918
Construction		657		2		—		2		659
Total commercial portfolio		32,935		106		29		135		33,070
Residential mortgage		22,835		142		169		311		23,146
Home equity and other consumer loans		3,494		27		21		48		3,542
Total consumer portfolio		26,329		169		190		359		26,688
Total loans held for investment, excluding purchased credit-impaired loans	$	59,264	$	275	$	219	$	494	$	59,758

50

Note 4—Loans and Allowance for Loan Losses (Continued)

	December 31, 2012
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	21,861	$	68	$	2	$	70	$	21,931
Commercial mortgage		9,869		57		13		70		9,939
Construction		622		5		—		5		627
Total commercial portfolio		32,352		130		15		145		32,497
Residential mortgage		22,351		181		173		354		22,705
Home equity and other consumer loans		3,584		44		19		63		3,647
Total consumer portfolio		25,935		225		192		417		26,352
Total loans held for investment, excluding purchased credit-impaired loans	$	58,287	$	355	$	207	$	562	$	58,849

Loans 90 days or more past due and still accruing totaled $3 million and $1 million at March 31, 2013 and December 31, 2012, respectively. Purchased credit-impaired loans that are 90 days or more past due and still accruing totaled $125 million and $124 million at March 31, 2013 and December 31, 2012, respectively.

Credit Quality Indicators

Management analyzes the Company’s loan portfolios by applying specific monitoring policies and procedures that vary according to the relative risk profile and other characteristics within the various loan portfolios. For further information related to the credit quality indicators the Company uses to monitor the portfolio, see Note 4 to the consolidated financial statements in the Company’s 2012 Form 10-K.

The following tables summarize the loans in the commercial portfolio segment and commercial loans within the purchased credit-impaired loans segment monitored for credit quality based on internal ratings, excluding $327 million and $365 million covered by Federal Deposit Insurance Corporation (FDIC) loss share agreements, at March 31, 2013 and December 31, 2012, respectively. The amounts presented reflect unpaid principal balances less charge-offs. The amounts presented for purchased credit-impaired loans also reflect purchase price adjustments as of acquisition date.

	March 31, 2013
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	21,168	$	770	$	381	$	22,319
Construction		644		16		—		660
Commercial mortgage		9,355		168		210		9,733
Total commercial portfolio		31,167		954		591		32,712
Purchased credit-impaired loans		4		158		304		466
Total	$	31,171	$	1,112	$	895	$	33,178

	December 31, 2012
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	20,961	$	438	$	380	$	21,779
Construction		610		17		—		627
Commercial mortgage		9,298		194		248		9,740
Total commercial portfolio		30,869		649		628		32,146
Purchased credit-impaired loans		21		153		301		475
Total	$	30,890	$	802	$	929	$	32,621

51

Note 4—Loans and Allowance for Loan Losses (Continued)

The Company monitors the credit quality of its consumer portfolio segment and consumer loans within the purchased credit-impaired loans segment based primarily on payment status. The following tables summarize the loans in the consumer portfolio segment and purchased credit-impaired loans segment, which excludes $49 million and $57 million of loans covered by FDIC loss share agreements, at March 31, 2013 and December 31, 2012, respectively:

	March 31, 2013
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	22,820	$	326	$	23,146
Home equity and other consumer loans		3,483		59		3,542
Total consumer portfolio		26,303		385		26,688
Purchased credit-impaired loans		282		—		282
Total	$	26,585	$	385	$	26,970

	December 31, 2012
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	22,399	$	306	$	22,705
Home equity and other consumer loans		3,591		56		3,647
Total consumer portfolio		25,990		362		26,352
Purchased credit-impaired loans		288		—		288
Total	$	26,278	$	362	$	26,640

The Company also monitors the credit quality for substantially all of its consumer portfolio segment using credit scores provided by Fair Isaac Corporation (FICO) and refreshed weighted average loan-to-value (LTV) ratios. FICO credit scores are refreshed at least quarterly to monitor the quality of the portfolio. Refreshed LTV measures the principal balance of the loan as a percentage of the estimated current value of the property securing the loan. Home equity loans are evaluated using combined LTV, which measures the principal balance of the combined loans that have liens against the property (including unused amounts for home equity line products) as a percentage of the estimated current value of the property securing the loans. The LTV ratios are refreshed on a quarterly basis, using the most recent home pricing index (HPI) data available for the property location.

The following tables summarize the loans in the consumer portfolio segment and consumer loans within the purchased credit-impaired loans segment monitored for credit quality based on refreshed FICO scores and refreshed LTV ratios at March 31, 2013 and December 31, 2012. These tables exclude loans serviced by third-parties and loans covered by FDIC loss share agreements, as discussed above. The amounts presented reflect unpaid principal balances less partial charge-offs.

	March 31, 2013
	FICO scores
(Dollars in millions)	720 and above			Below 720			No FICO available(1)			Total
Residential mortgage	$	17,381		$	4,630		$	445		$	22,456
Home equity and other consumer loans		2,374			931			164			3,469
Total consumer portfolio		19,755			5,561			609			25,925
Purchased credit-impaired loans		104			163			15			282
Total	$	19,859		$	5,724		$	624		$	26,207
Percentage of total		76	%		22	%		2	%		100	%

52

Note 4—Loans and Allowance for Loan Losses (Continued)

	December 31, 2012
	FICO scores
(Dollars in millions)	720 and above			Below 720			No FICO available(1)			Total
Residential mortgage	$	17,103		$	4,666		$	395		$	22,164
Home equity and other consumer loans		2,464			986			122			3,572
Total consumer portfolio		19,567			5,652			517			25,736
Purchased credit-impaired loans		106			172			10			288
Total	$	19,673		$	5,824		$	527		$	26,024
Percentage of total		76	%		22	%		2	%		100	%

⁽¹⁾  Represents loans for which management was not able to obtain an updated FICO score (e.g., due to recent profile changes).

	March 31, 2013
	LTV ratios
(Dollars in millions)	Less than 80 percent			80-100 percent			Greater than 100 percent			No LTV available(1)			Total
Residential mortgage	$	18,973		$	2,583		$	892		$	8		$	22,456
Home equity loans		2,286			546			438			120			3,390
Total consumer portfolio		21,259			3,129			1,330			128			25,846
Purchased credit-impaired loans		129			45			78			30			282
Total	$	21,388		$	3,174		$	1,408		$	158		$	26,128
Percentage of total		82	%		12	%		5	%		1	%		100	%
	December 31, 2012
	LTV ratios
(Dollars in millions)	Less than 80 percent			80-100 percent			Greater than 100 percent			No LTV available(1)			Total
Residential mortgage	$	17,771		$	3,031		$	1,232		$	130		$	22,164
Home equity loans		2,216			618			540			113			3,487
Total consumer portfolio		19,987			3,649			1,772			243			25,651
Purchased credit-impaired loans		72			50			153			13			288
Total	$	20,059		$	3,699		$	1,925		$	256		$	25,939
Percentage of total		77	%		14	%		8	%		1	%		100	%

⁽¹⁾ Represents loans for which management was not able to obtain refreshed property values.

53

Note 4—Loans and Allowance for Loan Losses (Continued)

Troubled Debt Restructurings

The following table provides a summary of the Company’s recorded investment in troubled debt restructurings (TDRs) as of March 31, 2013 and December 31, 2012. The summary includes those TDRs that are on nonaccrual status and those that continue to accrue interest. The Company had $45 million in commitments to lend additional funds to borrowers with loan modifications classified as TDRs as of March 31, 2013.

(Dollars in millions)	March 31, 2013		December 31, 2012
Commercial and industrial	$	251	$	215
Commercial mortgage		38		64
Construction		2		35
Total commercial portfolio		291		314
Residential mortgage		279		271
Home equity and other consumer loans		21		21
Total consumer portfolio		300		292
Total excluding purchased credit-impaired loans(1)	$	591	$	606

⁽¹⁾  Amounts exclude $4 million of TDRs covered by FDIC loss share agreements at both March 31, 2013 and December 31, 2012, respectively.

For the first quarter of 2013, TDR modifications in the commercial portfolio segment were primarily composed of interest rate changes, maturity extensions, principal paydowns, covenant waivers and payment deferrals, or some combination thereof. In the consumer portfolio segment, primarily all of the modifications were composed of interest rate reductions and maturity extensions. There were charge-offs of $1 million related to TDR modifications in the first quarter of 2013. For the commercial and consumer portfolio segments, the allowance for loan losses for TDRs is measured on an individual loan basis or in pools with similar risk characteristics.

The following tables provide the pre- and post-modification outstanding recorded investment amounts of TDRs as of the date of the restructuring that occurred during the first quarter of 2013:

	For the Three Months Ended March 31, 2013
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	76	$	74
Commercial mortgage		11		11
Total commercial portfolio		87		85
Residential mortgage		25		24
Home equity and other consumer loans		1		1
Total consumer portfolio		26		25
Total	$	113	$	110

⁽¹⁾  Represents the recorded investment in the loan immediately prior to the restructuring event.

⁽²⁾  Represents the recorded investment in the loan immediately following the restructuring event. It includes the effect of paydowns that were required as part of the restructuring terms.

54

Note 4—Loans and Allowance for Loan Losses (Continued)

The following table provides the recorded investment amounts of TDRs at the date of default, for which there was a payment default during the first quarter of 2013, and where the default occurred within the first twelve months after modification into a TDR. A payment default is defined as the loan being 60 days or more past due.

(Dollars in millions)	For the Three Months Ended March 31, 2013
Commercial and industrial	$	5
Residential mortgage		2
Total	$	7

For the consumer portfolio, historical payment defaults and the propensity to redefault are some of the factors considered when determining the allowance for loan losses for situations where impairment is measured using the present value of expected future cash flows discounted at the loan’s effective interest rate.

Loan Impairment

Loans that are individually evaluated for impairment include larger commercial and industrial, construction, commercial mortgage loans, and loans modified in a TDR. When the value of an impaired loan is less than the recorded investment in the loan, the Company records an impairment allowance.

The following tables show information about impaired loans by class as of March 31, 2013 and December 31, 2012:

	March 31, 2013
	Recorded Investment						Allowance for Impaired Loans		Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total				With an Allowance		Without an Allowance
Commercial and industrial	$	199	$	64	$	263	$	30	$	209	$	65
Commercial mortgage		25		25		50		2		28		34
Construction		2		—		2		—		3		—
Total commercial portfolio		226		89		315		32		240		99
Residential mortgage		169		110		279		16		182		124
Home equity and other consumer loans		3		18		21		1		4		31
Total consumer portfolio		172		128		300		17		186		155
Total, excluding purchased credit-impaired loans		398		217		615		49		426		254
Purchased credit-impaired loans		1		3		4		—		1		11
Total	$	399	$	220	$	619	$	49	$	427	$	265

55

Note 4—Loans and Allowance for Loan Losses (Continued)

	December 31, 2012
	Recorded Investment						Allowance for Impaired Loans		Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total				With an Allowance		Without an Allowance
Commercial and industrial	$	156	$	64	$	220	$	24	$	167	$	64
Commercial mortgage		15		60		75		—		18		70
Construction		—		35		35		—		—		38
Total commercial portfolio		171		159		330		24		185		172
Residential mortgage		186		85		271		18		199		97
Home equity and other consumer loans		3		18		21		—		3		31
Total consumer portfolio		189		103		292		18		202		128
Total, excluding purchased credit-impaired loans		360		262		622		42		387		300
Purchased credit-impaired loans		—		4		4		—		1		14
Total	$	360	$	266	$	626	$	42	$	388	$	314

The following tables present the average recorded investment in impaired loans and the amount of interest income recognized for impaired loans during the first quarters of 2013 and 2012 for the commercial, consumer and purchased credit-impaired loans portfolio segments.

	For the Three Months Ended March 31,
	2013				2012
(Dollars in millions)	Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income
Commercial and industrial	$	241	$	3	$	198	$	1
Commercial mortgage		63		—		124		—
Construction		18		—		65		1
Total commercial portfolio		322		3		387		2
Residential mortgage		275		3		154		1
Home equity and other consumer loans		21		—		2		—
Total consumer portfolio		296		3		156		1
Total, excluding purchased credit-impaired loans		618		6		543		3
Purchased credit-impaired loans		5		—		12		—
Total	$	623	$	6	$	555	$	3

The Company transferred a net $148 million of loans from held for investment to held for sale and sold $160 million in loans during the first quarter of 2013.

Loans Acquired in Business Combinations

The Company accounts for certain loans acquired in business combinations in accordance with accounting guidance related to loans acquired with deteriorated credit quality (purchased credit-impaired loans). The following table presents the outstanding balances and carrying amounts of the Company’s purchased credit-impaired loans as of March 31, 2013 and December 31, 2012.

	March 31,		December 31,
(Dollars in millions)	2013		2012
Total outstanding balance	$	1,956	$	2,155
Carrying amount	$	1,103	$	1,161

56

Note 4—Loans and Allowance for Loan Losses (Continued)

The accretable yield for purchased credit-impaired loans for the first quarters of 2013 and 2012 was as follows:

	For the Three Months Ended March 31,
(Dollars in millions)	2013			2012
Accretable yield, beginning of period	$	590		$	424
Additions		—			—
Accretion		(79	)		(63	)
Reclassifications from nonaccretable difference during the period		(10	)		80
Accretable yield, end of period	$	501		$	441

Note 5—Variable Interest Entities

The Company is involved in various activities that are considered to be variable interest entities (VIEs). Generally, a VIE is a corporation, partnership, trust or any other legal structure where the equity investors do not have sufficient equity at risk in the entity to allow the entity to independently finance its activities, lack the power to direct the significant activities of the entity through voting or similar rights, or do not have an obligation to absorb the entity’s losses or the right to receive the entity’s returns. The Company’s investments in VIEs primarily consist of equity investments in low income housing credit (LIHC) structures and renewable energy projects, which are designed to generate returns principally through the realization of federal tax credits and deductions. For further information related to the Company’s consolidated VIEs and those that were not consolidated, see Note 7 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Consolidated VIEs

At March 31, 2013, assets of $293 million and liabilities of $7 million were consolidated by the Company on its consolidated balance sheet related to two LIHC investment fund structures because the Company sponsors, manages and syndicates the funds. The assets are included in other assets as well as interest bearing deposits in banks, the liabilities are primarily included in long-term debt, and third-party investor interests are included in stockholder’s equity as noncontrolling interests. Neither creditors nor equity investors in the LIHC investments have any recourse to the general credit of the Company, and the Company’s creditors do not have any recourse to the assets of the consolidated LIHC investments. At March 31, 2013, the Company also consolidated $99 million of assets related to trusts that own and lease railcars because the Company directs the significant activities of these trusts. The assets are primarily included in other assets on the Company’s consolidated balance sheets.

During both the first quarter of 2013 and the first quarter of 2012, the Company recorded $7 million of expenses related to its consolidated VIEs. These expenses are included in other noninterest expense on the Company’s consolidated statements of income. During the first quarter of 2013, the Company recorded $2 million of revenue related to its consolidated VIEs in other noninterest income.

57

Note 5—Variable Interest Entities (Continued)

Unconsolidated VIEs in which the Company has a Variable Interest

The following table presents the Company’s carrying amounts related to the unconsolidated VIEs and location on the consolidated balance sheet at March 31, 2013. The table also presents the Company’s maximum exposure to loss resulting from its involvement with these VIEs. The maximum exposure to loss represents the carrying amount of the Company’s involvement plus any legally binding unfunded commitments in the unlikely event that all of the assets in the VIEs become worthless.

	March 31, 2013
(Dollars in millions)	Total Assets		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	523	$	21	$	886
Renewable energy investments		367		34		367
Private capital investment		17		—		23
Total unconsolidated VIEs	$	907	$	55	$	1,276

Note 6—Employee Pension and Other Postretirement Benefits

The following table summarizes the components of net periodic benefit cost for the first quarters of 2013 and 2012:

	Pension Benefits						Other Benefits						Superannuation, SERP(1) and  ESBP(2)
	For the Three Months Ended March 31,						For the Three Months Ended March 31,						For the Three Months Ended March 31,
(Dollars in millions)	2013			2012			2013			2012			2013		2012
Components of net periodic benefit cost:
Service cost	$	22		$	18		$	4		$	3		$	—	$	—
Interest cost		25			26			3			3			1		1
Expected return on plan assets		(41	)		(37	)		(4	)		(3	)		—		—
Recognized net actuarial loss		27			23			1			2			1		1
Total net periodic benefit cost	$	33		$	30		$	4		$	5		$	2	$	2

⁽¹⁾  Supplemental Executives Retirement Plan (SERP).

⁽²⁾ Executive Supplemental Benefit Plans (ESBP).

Note 7—Commercial Paper and Other Short-Term Borrowings

The following table is a summary of the Company’s commercial paper and other short-term borrowings:

(Dollars in millions)	March 31, 2013		December 31, 2012
Federal funds purchased and securities sold under repurchase agreements with weighted average interest rates of 0.14% and 0.96% at March 31, 2013 and December 31, 2012, respectively	$	248	$	123
Commercial paper, with weighted average interest rates of 0.19% and 0.20% at March 31, 2013 and December 31, 2012, respectively		1,711		1,240
Other borrowed funds:
Term federal funds purchased, with a weighted average interest rate of 0.15% at March 31, 2013		269		—
Total commercial paper and other short-term borrowings	$	2,228	$	1,363

58

Note 8—Long-Term Debt

The following is a summary of the Company’s long-term debt:

(Dollars in millions)	March 31, 2013		December 31, 2012
Debt issued by UnionBanCal Corporation
Senior debt:
Fixed rate 3.50% notes due June 2022	$	397	$	397
Subordinated debt:
Fixed rate 5.25% notes due December 2013		404		406
Total debt issued by UnionBanCal Corporation		801		803
Debt issued by Union Bank, N.A. and other subsidiaries
Senior debt:
Fixed and floating rate Federal Home Loan Bank advances with maturities ranging from September 2013 to February 2016. These notes bear a combined weighted-average rate of 1.33% at March 31, 2013 and 1.39% at December 31, 2012		1,800		2,100
Floating rate notes due June 2014. These notes, which bear interest at 0.95% above 3-month LIBOR, had a rate of 1.26% at both March 31, 2013 and December 31, 2012		300		300
Fixed rate 2.125% notes due December 2013		400		399
Fixed rate 3.00% notes due June 2016		699		699
Fixed rate 2.125% notes due June 2017		499		499
Note payable:
Fixed rate 6.03% notes due July 2014 (related to consolidated VIE)		6		6
Subordinated debt:
Fixed rate 5.95% notes due May 2016		726		729
Junior subordinated debt payable to trusts(1):
Floating rate notes with maturities ranging from March 2033 to September 2036. These notes bear a combined weighted-average rate of 2.64% at March 31, 2013 and 2.66% at December 31, 2012		66		66
Capital lease obligations with a combined weighted average interest rate of 4.89% at March 31, 2013 and 4.72% at December 31, 2012(1)		17		21
Total debt issued by Union Bank, N.A. and other subsidiaries		4,513		4,819
Total long-term debt	$	5,314	$	5,622

⁽¹⁾  Long-term debt assumed through PCBC acquisition

Note 9—Fair Value Measurement and Fair Value of Financial Instruments

Valuation Methodologies

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., an exit price) in an orderly transaction between willing market participants at the measurement date. The Company has an established and documented process for determining fair value for financial assets and financial liabilities that are measured at fair value on either a recurring or nonrecurring basis. When available, quoted market prices are used to determine fair value. If quoted market prices are not available, fair value is based upon valuation techniques that use, where possible, current market-based or independently sourced parameters, such as yield curves, foreign exchange rates, credit spreads, commodity prices, and implied volatilities. Valuation adjustments may be made to ensure the financial instruments are

59

Note 9—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

recorded at fair value. These adjustments include amounts that reflect counterparty credit quality and that consider the Company’s creditworthiness in determining the fair value of its trading liabilities. For further information related to the valuation methodologies used for certain financial assets and financial liabilities measured at fair value, see Note 16 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Fair Value Hierarchy

In determining fair value, the Company maximizes the use of observable market inputs and minimizes the use of unobservable inputs. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect the Company’s estimate about market data. Based on the observability of the significant inputs used, the Company classifies its fair value measurements in accordance with the three-level hierarchy as defined by U.S. GAAP. This hierarchy is based on the quality, observability, and reliability of the information used to determine fair value. For further information related to the fair value hierarchy, see Note 16 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Valuation Processes

The Company has established a Valuation Committee (VC) to oversee its valuation framework for measuring fair value and to establish valuation policies and procedures. The VC’s responsibilities include reviewing and approving all fair value measurements and categorizations within the fair value hierarchy and monitoring the use of pricing sources, mark-to-model valuations, dealer quotes, and other valuation processes. The VC reports to the Company’s Risk & Capital Committee and meets at least quarterly.

Independent price verification (IPV) is performed periodically by the Company to test the market data and valuations of substantially all instruments measured at fair value on a recurring basis. As part of its IPV procedures, the Company utilizes third party valuations and both internal and external models to compare pricing sources and perform analysis. Results are formally reported on a quarterly basis to the VC. For further information related to valuation processes, see Note 16 to the consolidated financial statements in the Company’s 2012 Form 10-K.

60

Note 9—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

Fair Value Measurements on a Recurring Basis

The following tables present financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2013 and December 31, 2012, by major category and by valuation hierarchy level:

	March 31, 2013
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets:
U.S. Treasury	$	—		$	51		$	—		$	—		$	51
U.S. government sponsored agencies		—			108			—			—			108
State and municipal		—			5			—			—			5
Commercial paper		—			10			—			—			10
Interest rate derivative contracts		—			966			—			(91	)		875
Commodity derivative contracts		—			111			26			(107	)		30
Foreign exchange derivative contracts		1			49			4			(27	)		27
Equity derivative contracts		—			—			156			(143	)		13
Total trading account assets		1			1,300			186			(368	)		1,119
Securities available for sale:
U.S. government sponsored agencies		—			472			—			—			472
Residential mortgage-backed securities:
U.S. government and government sponsored agencies		—			13,281			—			—			13,281
Privately issued		—			362			—			—			362
Commercial mortgage-backed securities		—			3,563			—			—			3,563
CLOs		—			2,302			—			—			2,302
Asset-backed and other		—			100			—			—			100
Other debt securities:
Direct bank purchase bonds		—			—			1,532			—			1,532
Other		—			98			60			—			158
Equity securities		31			—			—			—			31
Total securities available for sale		31			20,178			1,592			—			21,801
Other assets:
Interest rate hedging contracts		—			24			—			(24	)		—
Other derivative contracts		—			—			1			—			1
Total other assets		—			24			1			(24	)		1
Total assets	$	32		$	21,502		$	1,779		$	(392	)	$	22,921
Percentage of Total		—	%		94	%		8	%		(2	)%		100	%
Percentage of Total Company Assets		—	%		22	%		2	%		—	%		24	%
Liabilities
Trading account liabilities:
Interest rate derivative contracts	$	4		$	894		$	—		$	(452	)	$	446
Commodity derivative contracts		—			90			26			(48	)		68
Foreign exchange derivative contracts		1			48			4			(6	)		47
Equity derivative contracts		—			—			157			—			157
Securities sold, not yet purchased		—			24			—			—			24
Total trading account liabilities		5			1,056			187			(506	)		742
Other liabilities:
FDIC clawback liability		—			—			93			—			93
Other derivative contracts		—			1			3			(1	)		3
Total other liabilities		—			1			96			(1	)		96
Total liabilities	$	5		$	1,057		$	283		$	(507	)	$	838
Percentage of Total		—	%		126	%		34	%		(60	)%		100	%
Percentage of Total Company Liabilities		—			1	%		—			—			1	%

⁽¹⁾  Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.

61

Note 9—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

	December 31, 2012
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets:
U.S. Treasury	$	—		$	1		$	—		$	—		$	1
U.S. government sponsored agencies		—			113			—			—			113
State and municipal		—			15			—			—			15
Commercial paper		—			10			—			—			10
Interest rate derivative contracts		—			1,075			—			(87	)		988
Commodity derivative contracts		—			137			30			(127	)		40
Foreign exchange derivative contracts		1			65			3			(28	)		41
Equity derivative contracts		—			—			103			(103	)		—
Total trading account assets		1			1,416			136			(345	)		1,208
Securities available for sale:
U.S. Treasury		—			—			—			—			—
U.S. government sponsored agencies		—			885			—			—			885
Residential mortgage-backed securities:
U.S government and government sponsored agencies		—			13,333			—			—			13,333
Privately issued		—			443			—			—			443
Commercial mortgage-backed securities		—			2,971			—			—			2,971
CLOs		—			1,959			—			—			1,959
Asset-backed and other		—			146			—			—			146
Other debt securities:
Direct bank purchase bonds		—			—			1,438			—			1,438
Other		—			97			61			—			158
Equity securities		19			—			—			—			19
Total securities available for sale		19			19,834			1,499			—			21,352
Other assets:
Interest rate hedging contracts		—			28			—			(24	)		4
Other derivative contracts		—			1			—			(1	)		—
Total other assets		—			29			—			(25	)		4
Total assets	$	20		$	21,279		$	1,635		$	(370	)	$	22,564
Percentage of Total		—			94	%		7	%		(1	)%		100	%
Percentage of Total Company Assets		—			22	%		1	%		—			23	%
Liabilities
Trading account liabilities:
Interest rate derivative contracts	$	5		$	1,004		$	—		$	(407	)	$	602
Commodity derivative contracts		—			110			30			(42	)		98
Foreign exchange derivative contracts		1			61			3			—			65
Equity derivative contracts		—			—			103			—			103
Securities sold, not yet purchased		—			27			—			—			27
Total trading account liabilities		6			1,202			136			(449	)		895
Other liabilities:
FDIC clawback liability		—			—			92			—			92
Other derivative contracts		—			—			3			—			3
Total other liabilities		—			—			95			—			95
Total liabilities	$	6		$	1,202		$	231		$	(449	)	$	990
Percentage of Total		1	%		121	%		23	%		(45	)%		100	%
Percentage of Total Company Liabilities		—			2	%		—			(1	)%		1	%

⁽¹⁾  Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.

62

Note 9—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

The following tables present a reconciliation of the assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the first quarters of 2013 and 2012. Level 3 available for sale securities at March 31, 2013 and 2012 primarily consisted of direct bank purchase bonds. The Company’s policy is to recognize transfers in and out of Level 1, 2 and 3 as of the end of a reporting period. In the first quarter of 2012, the Company, based on its analysis, transferred its U.S. Treasury and U.S. government sponsored agency securities from Level 1 to Level 2 and certain of its derivative contracts from Level 2 to Level 3.

	For the Three Months Ended
	March 31, 2013
(Dollars in millions)	Trading Assets		Securities Available for Sale			Other Assets		Trading Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	136	$	1,499		$	—	$	(136	)	$	(95	)
Total gains (losses) (realized/unrealized):
Included in income before taxes		47		—			—		(48	)		(1	)
Included in other comprehensive income		—		19			—		—			—
Purchases/additions		3		137			1		—			—
Sales		—		(14	)		—		(3	)		—
Settlements		—		(49	)		—		—			—
Asset (liability) balance, end of period	$	186	$	1,592		$	1	$	(187	)	$	(96	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	47	$	—		$	—	$	(48	)	$	(1	)

	For the Three Months Ended
	March 31, 2012
(Dollars in millions)	Trading Assets		Securities Available for Sale			Trading Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	—	$	48		$	—		$	(51	)
Total gains (losses) (realized/unrealized):
Included in income before taxes		—		—			—			(12	)
Included in other comprehensive income		—		(5	)		—			—
Transfers into Level 3		153		—			(153	)		—
Asset (liability) balance, end of period	$	153	$	43		$	(153	)	$	(63	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	—	$	—		$	—		$	(12	)

63

Note 9—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

The following table presents information about significant unobservable inputs related to the Company’s significant Level 3 assets and liabilities at March 31, 2013.

	March 31, 2013
(Dollars in millions)	Level 3 Fair Value		Valuation Technique(s)	Significant Unobservable Input(s)	Range of Inputs			Weighted Average
Securities available for sale:
Direct bank purchase bonds	$	1,532	Return on equity	Market-required return on capital		13.0 - 15.0	%		14.1	%
				Probability of default		0.0 - 8.0	%		0.6	%
				Loss severity		10.0 - 75.0	%		37.2	%
Other liabilities:
FDIC clawback liability	$	93	Discounted cash flow	Probability of default		0.2 - 100.0	%		57.1	%
				Loss severity		20.0 - 100.0	%		51.0	%

The direct bank purchase bonds use a return on equity valuation technique. This technique uses significant unobservable inputs such as market-required return on capital, probability of default, and loss severity. Increases (decreases) in any of these inputs in isolation would result in a lower (higher) fair value measurement.

The FDIC clawback liability uses a discounted cash flow valuation technique. This technique uses significant unobservable inputs such as probability of default and loss severity. Increases (decreases) in probability of default and loss severity would result in a lower (higher) liability.

Fair Value Measurement on a Nonrecurring Basis

Certain assets may be measured at fair value on a nonrecurring basis. These assets are subject to fair value adjustments that result from the application of the lower of cost or fair value accounting or write-downs of individual assets. For assets measured at fair value on a nonrecurring basis during the first quarters of 2013 and 2012 that were still held on the consolidated balance sheet as of the respective periods ended, the following tables present the fair value of such financial instruments by the level of valuation assumptions used to determine each fair value adjustment:

	March 31, 2013								Loss for the Three Months Ended March 31, 2013
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3
Loans:
Impaired loans	$	90	$	—	$	—	$	90	$	(12	)
Other assets:
OREO		38		—		—		38		(3	)
Total	$	128	$	—	$	—	$	128	$	(15	)
	March 31, 2012								Loss for the Three Months Ended March 31, 2012
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3
Loans:
Impaired loans	$	58	$	—	$	—	$	58	$	(3	)
Other assets:
OREO		71		—		—		71		(8	)
Private equity investments		27		—		—		27		(2	)
Total	$	156	$	—	$	—	$	156	$	(13	)

Loans include individually impaired loans that are measured at fair value based on appraised values of the underlying collateral or market pricing for the loan, adjusted for management judgment, as of the measurement date. The fair value of OREO was primarily based on independent appraisals.

64

Note 9—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

Fair Value of Financial Instruments Disclosures

The tables below present the carrying amount and estimated fair value of certain financial instruments by the level of valuation assumptions held by the Company as of March 31, 2013, and the carrying amount and the estimated fair value at December 31, 2012:

	March 31, 2013
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	5,091	$	5,091	$	5,091	$	—	$	—
Securities held to maturity		1,015		1,036		—		1,036		—
Loans held for investment, net of allowance for loan losses(1)		59,193		60,489		—		—		60,489
FDIC indemnification asset		285		153		—		—		153
Other assets		3		3		—		—		3
Liabilities
Deposits	$	73,990	$	74,254	$	—	$	74,254	$	—
Commercial paper and other short-term borrowings		2,228		2,229		—		2,229		—
Long-term debt		5,314		5,512		—		5,512		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	279	$	279	$	—	$	—	$	279

⁽¹⁾  Excludes lease financing, net of related allowance.

	December 31, 2012
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	5,491	$	5,491	$	5,491	$	—	$	—
Securities held to maturity		1,103		1,135		—		1,135		—
Loans held for investment, net of allowance for loan losses(1)		58,284		59,613		—		—		59,613
FDIC indemnification asset		338		151		—		—		151
Other assets		3		3		—		—		3
Liabilities
Deposits	$	74,255	$	74,524	$	—	$	74,524	$	—
Commercial paper and other short-term borrowings		1,363		1,363		—		1,363		—
Long-term debt		5,622		5,861		—		5,861		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	262	$	262	$	—	$	—	$	262

⁽¹⁾  Excludes lease financing, net of related allowance.

For further information on methodologies for approximating fair values, see Note 16 to the consolidated financial statements in the Company’s 2012 Form 10-K.

65

Note 10—Derivative Instruments and Other Financial Instruments

The Company enters into certain derivative and other financial instruments for trading purposes, which includes customer accommodation derivative contracts, and for other-than-trading purposes, which are predominantly used for risk management.

Credit and market risks are inherent in derivative instruments. Credit risk is defined as the possibility that a loss may occur from the failure of another party to perform in accordance with the terms of the contract, which exceeds the value of the existing collateral, if any. The Company utilizes master netting and collateral support annex (CSA) agreements in order to reduce its exposure to credit risk. Additionally, the Company considers the potential loss in the event of counterparty default in estimating the fair value amount of the derivative instrument. Market risk is defined as the risk of loss arising from an adverse change in the market value of financial instruments caused by fluctuations in market prices or rates.

Derivatives are primarily used to manage exposure to interest rate, commodity, foreign currency and credit risk, and to assist customers with their risk management objectives. The Company designates derivative instruments as those used for trading or other-than-trading purposes. All derivative instruments are recognized as assets or liabilities on the consolidated balance sheet at fair value.

66

Note 10—Derivative Instruments and Other Financial Instruments (Continued)

The tables below present the notional amounts, and the location and fair value amounts of the Company’s derivative instruments reported on the consolidated balance sheet, segregated between derivative instruments designated and qualifying as hedging instruments and all other derivative instruments as of March 31, 2013 and December 31, 2012. Asset and liability values are presented gross, excluding the impact of legally enforceable master netting and CSA agreements.

	March 31, 2013
			Asset Derivatives			Liability Derivatives
(Dollars in millions)	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Total derivatives designated as hedging instruments:
Interest rate contracts	$	7,350	Other assets	$	24	Other liabilities	$	—
Derivatives not designated as hedging instruments:
Interest rate contracts	$	39,545	Trading account assets	$	966	Trading account liabilities	$	898
Commodity contracts		5,703	Trading account assets		137	Trading account liabilities		116
Foreign exchange contracts		4,249	Trading account assets		54	Trading account liabilities		53
Equity contracts		3,691	Trading account assets		156	Trading account liabilities		157
Other contracts		89	Other assets		1	Other liabilities		4
Total derivatives not designated as hedging instruments	$	53,277		$	1,314		$	1,228
Total derivative instruments	$	60,627		$	1,338		$	1,228
	December 31, 2012
			Asset Derivatives			Liability Derivatives
(Dollars in millions)	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Total derivatives designated as hedging instruments:
Interest rate contracts	$	8,400	Other assets	$	28	Other liabilities	$	—
Derivatives not designated as hedging instruments:
Interest rate contracts	$	37,790	Trading account assets	$	1,075	Trading account liabilities	$	1,009
Commodity contracts		5,595	Trading account assets		167	Trading account liabilities		140
Foreign exchange contracts		4,593	Trading account assets		69	Trading account liabilities		65
Equity contracts		3,631	Trading account assets		103	Trading account liabilities		103
Other contracts		109	Other assets		1	Other liabilities		3
Total derivatives not designated as hedging instruments	$	51,718		$	1,415		$	1,320
Total derivative instruments	$	60,118		$	1,443		$	1,320

Derivatives Used for Other-Than-Trading Purposes

The Company uses interest rate derivatives to manage the financial impact on the Company from changes in market interest rates. These instruments are used to manage interest rate risk relating to specified groups of assets and liabilities, primarily LIBOR-based commercial loans, certificates of deposit (CDs), borrowings, and future debt issuances. Derivatives that qualify for hedge accounting are designated as either fair value or cash flow hedges. In the first quarters of 2013 and 2012, the Company did not have fair value hedges. The significant hedging strategies of the Company are described below.

67

Note 10—Derivative Instruments and Other Financial Instruments (Continued)

Cash Flow Hedges

Hedging Strategies for Variable Rate Loans, Borrowings and Certificates of Deposit and Other Time Deposits

The Company engages in several types of cash flow hedging strategies related to forecasted future interest payments, with the hedged risk being the changes in cash flows attributable to changes in the designated benchmark rate (i.e., U.S. dollar LIBOR). In these strategies, the hedging instruments are matched with groups of similar variable rate instruments such that the reset tenor of the variable rate instruments and that of the hedging instrument are identical at inception. Cash flow hedging instruments currently being utilized include purchased caps and interest rate swaps. At March 31, 2013, the weighted average remaining life of the currently active cash flow hedges was approximately 1.1 years.

The Company used purchased interest rate caps with a notional amount of $0.7 billion at March 31, 2013 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed borrowings. Payments received under the cap contract offset the increase in borrowing interest expense if the relevant LIBOR index rises above the cap’s strike rate.

The Company used purchased interest rate caps with a notional amount of $1.4 billion at March 31, 2013 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate component of forecasted issuances of short-term, fixed rate CDs. Net payments to be received under the cap contract offset increases in interest expense if the relevant LIBOR index rises above the cap’s strike rate.

The Company used interest rate swaps with a notional amount of $5.3 billion at March 31, 2013 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed loans. Payments received (or paid) under the swap contract offset fluctuations in interest income on loans caused by changes in the relevant LIBOR index.

Hedging transactions are structured at inception so that the hedging instruments have notional amounts that correspond to an equal amount of principal for loans, CDs, or borrowings. Additionally, the period in which the designated hedged cash flows occur is matched to the term of the hedged instruments. Index and repricing frequencies of the hedging instruments generally match those of the hedged items. As such, most of the ineffectiveness in the hedging relationship results from the mismatch between the timing of reset dates on the hedging instruments versus those of the loans, CDs, or borrowings.

For cash flow hedges, the effective portion of the gain or loss on the hedging instruments is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged cash flows are recognized in net interest income. Gains and losses representing hedge ineffectiveness are recognized in earnings in the period in which they arise. At March 31, 2013, the Company expects to reclassify approximately $23 million of income from accumulated other comprehensive income to net interest income during the twelve months ending March 31, 2014. This amount could differ from amounts actually realized due to changes in interest rates and the addition of other hedges subsequent to March 31, 2013.

68

Note 10—Derivative Instruments and Other Financial Instruments (Continued)

The following tables present the amount and location of the net gains and losses recorded in the Company’s consolidated statements of income and changes in stockholder’s equity for derivatives designated as cash flow hedges for the first quarters of 2013 and 2012:

	Amount of Gain or (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)				Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)					Gain or (Loss) Recognized in Income on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	For the Three Months Ended March 31,					For the Three Months Ended March 31,					For the Three Months Ended March 31,
(Dollars in millions)	2013		2012		Location	2013		2012		Location	2013		2012
Derivatives in cash flow hedging relationships
					Interest income	$	7	$	2
Interest rate contracts	$	6	$	10	Interest expense(1)		—		—	Noninterest expense(1)	$	—	$	—
Total	$	6	$	10		$	7	$	2		$	—	$	—

⁽¹⁾  Amount recognized was less than $1 million.

Trading Derivatives

Derivative instruments classified as trading include both derivatives entered into for the Company’s own account and as an accommodation for customers. Trading derivatives are included in trading assets or trading liabilities with changes in fair value reflected in income from trading account activities. The majority of the Company’s derivative transactions for customers were essentially offset by contracts with third parties that reduce or eliminate market risk exposures.

The Company offers market-linked CDs, which allow the client to earn the higher of either a minimum fixed rate of interest or a return tied to either equity, commodity or currency indices. The Company hedges its exposure to the embedded derivative contained in market-linked CDs with a matched over-the-counter option. Both the embedded derivative and hedge options are recorded at fair value with the realized and unrealized changes in fair value recorded in noninterest income within trading account activities.

The following table presents the amount of the net gains and losses reported in the consolidated statement of income under the heading trading account activities for derivative instruments classified as trading for the first quarters of 2013 and 2012:

	Gain or (Loss) Recognized in Income on Derivative Instruments
	For the Three Months Ended
(Dollars in millions)	March 31, 2013			March 31, 2012
Trading derivatives:
Interest rate contracts	$	(1	)	$	14
Equity contracts		3			5
Foreign exchange contracts		3			7
Commodity contracts		(1	)		—
Other contracts		1			—
Total	$	5		$	26

69

Note 10—Derivative Instruments and Other Financial Instruments (Continued)

Offsetting Assets and Liabilities

During the first quarter of 2013, the Company adopted ASU 2011-11, Disclosures about Offsetting Assets and Liabilities, which establishes new disclosures about an entity’s rights of setoff and arrangements associated with its financial instruments and derivative instruments. The Company primarily enters into derivative contracts and repurchase agreements with counterparties utilizing a standard International Swaps and Derivatives Association master netting agreement (ISDA MNA) or master repurchase agreements, which generally establish the terms and conditions of the transactions, including a legal right to set-off amounts payable and receivable between the Company and a counterparty, regardless of whether or not such amounts have matured or have contingency features.

The following tables present the offsetting of financial assets and liabilities as of March 31, 2013 and December 31, 2012:

	March 31, 2013
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative Assets	$	1,338	$	392	$	946	$	17	$	5	$	924
Securities purchased under resale agreements		24		—		24		24		—		—
Total	$	1,362	$	392	$	970	$	41	$	5	$	924
Financial Liabilities:
Derivative Liabilities	$	1,228	$	507	$	721	$	467	$	1	$	253
Securities sold under repurchase agreements		40		—		40		40		—		—
Total	$	1,268	$	507	$	761	$	507	$	1	$	253

	December 31, 2012
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative Assets	$	1,443	$	370	$	1,073	$	21	$	2	$	1,050
Securities purchased under resale agreements		19		—		19		19		—		—
Total	$	1,462	$	370	$	1,092	$	40	$	2	$	1,050
Financial Liabilities:
Derivative Liabilities	$	1,320	$	449	$	871	$	491	$	121	$	259
Securities sold under repurchase agreements		5		—		5		5		—		—
Total	$	1,325	$	449	$	876	$	496	$	121	$	259

70

Note 11—Accumulated Other Comprehensive Loss

The following table presents the change in each of the components of accumulated other comprehensive loss and the related tax effect of the change allocated to each component:

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended March 31, 2012:
Cash flow hedge activities:
Unrealized net gains on hedges arising during the period	$	10		$	(4	)	$	6
Less: Reclassification adjustment for net losses on hedges included in net income		(2	)		1			(1	)
Net change in unrealized losses on hedges		8			(3	)		5
Securities:
Unrealized holding gains arising during the period on securities available for sale		61			(24	)		37
Reclassification adjustment for net gains on securities available for sale included in net income		(19	)		7			(12	)
Less: accretion of fair value adjustment on securities available for sale		(1	)		—			(1	)
Less: accretion of fair value adjustment on held to maturity securities		(6	)		3			(3	)
Less: amortization of net unrealized losses on held to maturity securities		29			(11	)		18
Net change in unrealized losses on securities		64			(25	)		39
Foreign currency translation adjustment		1			—			1
Reclassification adjustment for pension and other benefits included in net income:
Recognized net actuarial loss(1)		26			(10	)		16
Net change in pension and other benefits(1)		26			(10	)		16
Net change in accumulated other comprehensive loss	$	99		$	(38	)	$	61
For the Three Months Ended March 31, 2013:
Cash flow hedge activities:
Unrealized net gains on hedges arising during the period	$	6		$	(2	)	$	4
Less: Reclassification adjustment for net losses on hedges included in interest income for loans and interest expense on long-term debt		(7	)		3			(4	)
Net change in unrealized gains on hedges		(1	)		1			—
Securities:
Reclassification adjustment for net gains on securities available for sale included in securities gains, net		(96	)		38			(58	)
Less: accretion of fair value adjustment on securities available for sale		(15	)		6			(9	)
Less: accretion of fair value adjustment on held to maturity securities		(8	)		3			(5	)
Less: amortization of net unrealized losses on held to maturity securities		14			(6	)		8
Net change in unrealized gains on securities		(105	)		41			(64	)
Foreign currency translation adjustment		(2	)		1			(1	)
Reclassification adjustment for pension and other benefits included in net income:
Recognized net actuarial loss(1)		29			(11	)		18
Net change in pension and other benefits(1)		29			(11	)		18
Net change in accumulated other comprehensive loss	$	(79	)	$	32		$	(47	)

⁽¹⁾  These amounts are included in the computation of net periodic pension cost. For further information, see Note 6 to these consolidated financial statements.

71

Note 11—Accumulated Other Comprehensive Loss (Continued)

The following table presents the change in accumulated other comprehensive loss balances:

(Dollars in millions)	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Benefits Adjustment			Accumulated Other Comprehensive Loss
Balance, December 31, 2011	$	(17	)	$	(107	)	$	—		$	(685	)	$	(809	)
Other comprehensive income before reclassifications		6			51			1			—			58
Amounts reclassified from accumulated other comprehensive loss		(1	)		(12	)		—			16			3
Balance, March 31, 2012	$	(12	)	$	(68	)	$	1		$	(669	)	$	(748	)
Balance, December 31, 2012	$	24		$	159		$	1		$	(698	)	$	(514	)
Other comprehensive income before reclassifications		4			(6	)		(1	)		—			(3	)
Amounts reclassified from accumulated other comprehensive loss		(4	)		(58	)		—			18			(44	)
Balance, March 31, 2013	$	24		$	95		$	—		$	(680	)	$	(561	)

Note 12—Commitments, Contingencies and Guarantees

The following table summarizes the Company’s commitments:

(Dollars in millions)	March 31, 2013
Commitments to extend credit	$	28,999
Standby and commercial letters of credit		5,930
Other commitments		712

Commitments to extend credit are legally binding agreements to lend to a customer provided there are no violations of any condition established in the contract. Commitments have fixed expiration dates or other termination clauses and may require maintenance of compensatory balances. Since many of the commitments to extend credit may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements.

Standby and commercial letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party, while commercial letters of credit are issued specifically to facilitate foreign or domestic trade transactions. Additionally, the Company enters into risk participations in bankers’ acceptances wherein a fee is received to guarantee a portion of the credit risk on an acceptance of another bank. The majority of these types of commitments have terms of one year or less. At March 31, 2013, the carrying amount of the Company’s risk participations in bankers’ acceptances and standby and commercial letters of credit totaled $4 million. Estimated exposure to loss related to these commitments is covered by the allowance for losses on off-balance sheet commitments. The carrying amounts of the standby and commercial letters of credit and the allowance for losses on off-balance sheet commitments are included in other liabilities on the consolidated balance sheet.

The credit risk involved in issuing loan commitments and standby and commercial letters of credit is essentially the same as that involved in extending loans to customers and is represented by the contractual amount of these instruments. Collateral may be obtained based on management’s credit assessment of the customer.

72

Note 12—Commitments, Contingencies and Guarantees (Continued)

Other commitments include commitments to fund principal investments, LIHC investments and other securities.

Principal investments include direct investments in private and public companies. The Company issues commitments to provide equity and mezzanine capital financing to private and public companies through direct investments. The timing of future cash requirements to fund such commitments is generally dependent on the investment cycle. This cycle, the period over which privately held companies are funded by private equity investors and ultimately sold, merged, or taken public through an initial offering, can vary based on overall market conditions as well as the nature and type of industry in which the companies operate.

The Company invests in either guaranteed or unguaranteed LIHC investments. The guaranteed LIHC investments carry a minimum rate of return guarantee by a creditworthy entity. The unguaranteed LIHC investments carry partial guarantees covering the timely completion of projects, availability of tax credits and operating deficit thresholds from the issuer. For these LIHC investments, the Company has committed to provide additional funding as stipulated by its investment participation.

The Company is a fund manager for limited liability companies issuing LIHC investments. LIHC investments provide tax benefits to investors in the form of tax deductions from operating losses and tax credits. To facilitate the sale of these LIHC investments, the Company guarantees a minimum rate of return throughout the investment term of over a twelve-year weighted average period. Additionally, the Company receives guarantees, which include the timely completion of projects, availability of tax credits and operating deficit thresholds, from the limited liability partnerships and corporations issuing the LIHC investments that reduce the Company’s ultimate exposure to loss. As of March 31, 2013, the Company’s maximum exposure to loss under these guarantees was limited to a return of investor capital and minimum investment yield, or $162 million. The risk that the Company would be required to pay investors for a yield deficiency is low, based on the continued satisfactory performance of the underlying properties. At March 31, 2013, the Company had $6 million recorded related to these guarantees, which represents the remaining unamortized carrying amount of the guarantee fees that were recognized at inception. For information on the Company’s LIHC investments that were consolidated, refer to Note 5 to the consolidated financial statements in this Form 10-Q.

The Company occasionally enters into financial guarantee contracts where a premium is received from another financial institution counterparty to guarantee a portion of the credit risk on interest rate swap contracts entered into between the financial institution and its customer. The Company becomes liable to pay the financial institution only if the financial institution is unable to collect amounts owed to them by their customer. As of March 31, 2013, the current exposure to loss under these contracts totaled $31 million, and the maximum potential exposure to loss in the future was estimated at $39 million.

The Company is subject to various pending and threatened legal actions that arise in the normal course of business. The Company maintains liabilities for losses from legal actions that are recorded when they are determined to be both probable in their occurrence and can be reasonably estimated. In addition, management believes the disposition of all claims currently pending, including potential losses from claims that may exceed the liabilities recorded, and claims for loss contingencies that are considered reasonably possible to occur, will not have a material effect, either individually or in the aggregate, on the Company’s consolidated financial condition, operating results or liquidity.

Note 13—Business Segments

The Company has three operating segments: Retail Banking Group, Corporate Banking Group and Pacific Rim Corporate Group. The Pacific Rim Corporate Group is included in “Other.” The Company has two reportable business segments: Retail Banking and Corporate Banking.

73

Note 13—Business Segments (Continued)

access 24-hours-a-day. These products offered include mortgages, home equity lines of credit, consumer and commercial loans, and deposit accounts.

• Corporate Banking provides credit, depository and cash management services, investment and risk management products to businesses, individuals and target specialty niches. Services include commercial and project finance loans, real estate financing, asset-based financing, trade finance and letters of credit, lease financing, customized cash management services and capital markets products, as well as trust, private banking, investment and asset management services for individuals and institutions.

“Other” is comprised of certain subsidiaries of UnionBanCal Corporation; the transfer pricing center; the amount of the provision for credit losses over/(under) the expected loss for the period; the residual costs of support groups; goodwill, intangible assets, and the related amortization/accretion associated with the Company’s privatization transaction; the elimination of the fully taxable-equivalent basis amount; and the difference between the marginal tax rate and the consolidated effective tax rate. In addition, “Other” includes Pacific Rim Corporate Group, which offers a range of credit, deposit, and investment management products and services to companies located primarily in the U.S. that are affiliated with companies headquartered in Japan and other Asian countries, Corporate Treasury, which is responsible for Asset-Liability Management (ALM), wholesale funding, the ALM investment securities and derivatives hedging portfolios, and the FDIC covered assets.

The information, set forth in the table that follows, is prepared using various management accounting methodologies to measure the performance of the individual segments. Unlike financial accounting, there is no authoritative body of guidance for management accounting equivalent to U.S. GAAP. Consequently, reported results are not necessarily comparable with those presented by other companies, and they are not necessarily indicative of the results that would be reported by our business units if they were unique economic entities. The management reporting accounting methodologies, which are enhanced from time to time, measure segment profitability by assigning balance sheet and income statement items to each operating segment. Methodologies that are applied to the measurement of segment profitability include:

• A funds transfer pricing system, which assigns a cost of funds or a credit for funds to assets or liabilities based on their type, maturity or repricing characteristics.

• An activity-based costing methodology, in which certain indirect costs, such as operations and technology expense, are allocated to the segments based on studies of billable unit costs for product or data processing. Other indirect costs, such as corporate overhead, are allocated to the segments based on internal surveys and metrics that serve as proxies for estimated usage.

• An expected credit loss allocation methodology, in which credit expense is charged to an operating segment based upon expected losses arising from credit risk. As a result of the methodology used in this model, differences between the provision for credit losses and credit expense in any one period could be significant. However, over an economic cycle, the cumulative provision for credit losses and credit expense for expected losses should be substantially the same.

The Company reflects a “market view” perspective in measuring the business segments. The market view is a measurement of customer markets aggregated to show all revenues generated and expenses incurred from all products and services sold to those customers regardless of where product areas organizationally report. Therefore, revenues and expenses are included in both the business segment that provides the service and the business segment that manages the customer relationship. The duplicative results from this internal management accounting view are eliminated in “Reconciling Items.”

The reportable business segment results for prior periods have been adjusted to reflect changes in the transfer pricing and overhead methodologies that have occurred.

74

Note 13—Business Segments (Continued)

	Retail Banking				Corporate Banking
	As of and for the Three Months Ended March 31,				As of and for the Three Months Ended March 31,
	2013		2012		2013		2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	309	$	268	$	355	$	324
Noninterest income (expense)		60		56		157		145
Total revenue		369		324		512		469
Noninterest expense (income)		300		264		273		236
Credit expense (income)		6		6		38		39
Income (loss) before income taxes and including noncontrolling interests		63		54		201		194
Income tax expense (benefit)		25		22		49		52
Net income (loss) including noncontrolling interest		38		32		152		142
Deduct: Net loss from noncontrolling interests		—		—		—		—
Net income (loss) attributable to UNBC	$	38	$	32	$	152	$	142
Total assets, end of period—Market View (Dollars in millions):	$	30,606	$	25,876	$	39,590	$	35,540

	Other						Reconciling Items
	As of and for the Three Months Ended March 31,						As of and for the Three Months Ended March 31,
	2013			2012			2013			2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	3		$	69		$	(19	)	$	(20	)
Noninterest income (expense)		53			28			(15	)		(15	)
Total revenue		56			97			(34	)		(35	)
Noninterest expense (income)		153			126			(13	)		(12	)
Credit expense (income)		(47	)		(46	)		—			—
Income (loss) before income taxes and including noncontrolling interests		(50	)		17			(21	)		(23	)
Income tax expense (benefit)		(15	)		(14	)		(9	)		(9	)
Net income (loss) including noncontrolling interest		(35	)		31			(12	)		(14	)
Deduct: Net loss from noncontrolling interests		4			4			—			—
Net income (loss) attributable to UNBC	$	(31	)	$	35		$	(12	)	$	(14	)
Total assets, end of period—Market View (Dollars in millions):	$	29,003		$	33,133		$	(2,240	)	$	(2,226	)

	UnionBanCalCorporation
	As of and for the Three Months Ended March 31,
	2013			2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	648		$	641
Noninterest income (expense)		255			214
Total revenue		903			855
Noninterest expense (income)		713			614
Credit expense (income)		(3	)		(1	)
Income (loss) before income taxes and including noncontrolling interests		193			242
Income tax expense (benefit)		50			51
Net income (loss) including noncontrolling interest		143			191
Deduct: Net loss from noncontrolling interests		4			4
Net income (loss) attributable to UNBC	$	147		$	195
Total assets, end of period—Market View (Dollars in millions):	$	96,959		$	92,323

75

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

We are subject to various pending and threatened legal actions that arise in the normal course of business. We maintain liabilities for losses from legal actions that are recorded when they are determined to be both probable in their occurrence and can be reasonably estimated. In addition, we believe the disposition of all claims currently pending, including potential losses from claims that may exceed the liabilities recorded, and claims for loss contingencies that are considered reasonably possible to occur, will not have a material effect, either individually or in the aggregate, on our consolidated financial position or results of operations.

Item 1A. Risk Factors

For a discussion of risk factors relating to our business, please refer to Item 1A of Part I of our 2012 Form 10-K, which is incorporated by reference herein, in addition to the following information.

Company Factors

The Bank of Tokyo-Mitsubishi UFJ’s and Mitsubishi UFJ Financial Group’s credit ratings and financial or regulatory condition could adversely affect our operations

Adverse changes to our credit ratings, reputation or creditworthiness could have a negative effect on our operations. We generally fund our operations independently of BTMU and MUFG and believe our business is not necessarily closely related to the business or outlook of BTMU or MUFG. However, if BTMU and MUFG’s credit ratings or financial condition or prospects were to decline, this could adversely affect our credit rating or harm our reputation or perceived creditworthiness.

At this time, we cannot predict actions, if any, which the rating agencies may take regarding the Government of Japan, MUFG or BTMU, nor the ultimate effect of these developments on our credit rating.

BTMU and MUFG are also subject to regulatory oversight, review and supervisory action (which can include fines or penalties) by Japanese and U.S. regulatory authorities. Our business operations and expansion plans could be negatively affected by regulatory concerns or supervisory action in the U.S. and in Japan against BTMU or MUFG.

BTMU has received requests and subpoenas for information from government agencies in some jurisdictions, including the United States, Europe and Japan, which are conducting investigations into past submissions made by panel members, including BTMU, to the bodies that set various interbank offered rates. BTMU is cooperating with these investigations and has been conducting an internal investigation. Union Bank is not a member of any of these panels. In addition, BTMU and other panel members have been named as defendants in a number of civil lawsuits, including putative class actions, in the United States relating to similar matters. It is currently not possible for us to predict the scope and ultimate outcome of these investigations or lawsuits, including any possible effect on us as a member of MUFG.

Significant legal or regulatory proceedings could subject us to substantial uninsured liabilities

We are from time to time subject to claims and proceedings related to our present or previous operations including claims by customers and our employees and our contractual counterparties. These claims, which could include supervisory or enforcement actions by bank regulatory authorities, or criminal proceedings by prosecutorial authorities, could involve demands for large monetary amounts, including civil money penalties or fines imposed by government authorities, and significant defense costs. To mitigate the cost of some of these claims, we maintain insurance coverage in amounts and with deductibles that we believe are appropriate for our operations. However, our insurance coverage does not cover any civil money penalties or fines imposed by government authorities and may not cover all other claims that have been or

76

might be brought against us or continue to be available to us at a reasonable cost. As a result, we may be exposed to substantial uninsured liabilities, which could adversely affect our business, prospects, results of operations and financial condition. The federal bank regulators have announced regulatory enforcement actions against a number of large bank holding companies and banks arising from deficiencies in processes, procedures and controls involving anti-money laundering measures and compliance with the economic sanctions that affect transactions with designated foreign countries, nationals and others as provided for in the regulations of the Office of Foreign Assets Control of the U.S. Treasury Department. These actions evidence an intensification of the U.S. government’s expectations for compliance with these regulatory regimes on the part of banks operating in the U.S., including Union Bank, and may result in increased compliance costs and increased risks of regulatory sanctions.

77

Item 6. Exhibits

A list of exhibits to this Form 10-Q is set forth on the Exhibit Index immediately preceding such exhibits and is incorporated herein by reference.

78

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.

	UNIONBANCAL CORPORATION (Registrant)
Date: May 9, 2013	By:	/S/    MASASHI OKA
		Masashi Oka
		President and Chief Executive Officer
		(Principal Executive Officer)
Date: May 9, 2013	By:	/S/    JOHN F. WOODS
		John F. Woods
		Vice Chairman and Chief Financial Officer
		(Principal Financial Officer)
Date: May 9, 2013	By:	/S/    ROLLAND D. JURGENS
		Rolland D. Jurgens
		Executive Vice President, Controller and Chief Accounting Officer
		(Principal Accounting Officer)

79

EXHIBIT INDEX

No.	Description
31.1	Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002(1)
31.2	Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002(1)
32.1	Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002(1)(2)
32.2	Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002(1)(2)
101	Pursuant to Rule 405 of Regulation S-T, the following financial information from the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2013, is formatted in XBRL interactive data files: (i) Consolidated Statements of Income; (ii) Consolidated Statements of Comprehensive Income; (iii) Consolidated Balance Sheets; (iv) Consolidated Statements of Changes in Stockholder’s Equity; (v) Consolidated Statements of Cash Flows; and (vi) Notes to Financial Statements.(3)

⁽¹⁾  Filed herewith

⁽²⁾  In accordance with Item 601(b)(32)(ii) of Regulation S-K and SEC Release No. 34-47986, the certifications furnished in Exhibits 32.1 and 32.2 hereto are deemed to accompany this Form 10-Q and will not be deemed “filed” for purposes of Section 18 of the Exchange Act. Such certifications will not be deemed to be incorporated by reference into any filing under the Securities Act or the Exchange Act.

⁽³⁾  As provided in Rule 406T of Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934 and is not otherwise subject to liability under those sections.

80

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Masashi Oka, certify that:

1. I have reviewed this quarterly report on Form 10-Q of UnionBanCal Corporation (the “Registrant”);

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

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

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

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: May 9, 2013

By:	/s/ MASASHI OKA
	Masashi Oka
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, John F. Woods, certify that:

1. I have reviewed this quarterly report on Form 10-Q of UnionBanCal Corporation (the “Registrant”);

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

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

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

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: May 9, 2013

By:	/s/ JOHN F. WOODS
	John F. Woods
	Vice Chairman and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report of UnionBanCal Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Masashi Oka, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: May 9, 2013

By:	/s/ MASASHI OKA
	Masashi Oka
	Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report of UnionBanCal Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John F. Woods, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: May 9, 2013

By:	/s/ JOHN F. WOODS
	John F. Woods
	Chief Financial Officer

XML

Securities - Proceeds from Sales of Securities Available for Sale and Gross Realized Gains and Losses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Investments Debt And Equity Securities [Abstract]
Proceeds from sales	$ 5,098	$ 1,251
Gross realized gains	$ 99	$ 19

XML

Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Total excluding purchased credit-impaired loans	$ 591	$ 606
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Total excluding purchased credit-impaired loans	251	215
Commercial mortgage [Member]
Financing Receivable, Modifications [Line Items]
Total excluding purchased credit-impaired loans	38	64
Construction [Member]
Financing Receivable, Modifications [Line Items]
Total excluding purchased credit-impaired loans	2	35
Commercial portfolio [Member]
Financing Receivable, Modifications [Line Items]
Total excluding purchased credit-impaired loans	291	314
Residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Total excluding purchased credit-impaired loans	279	271
Home equity and other consumer loans [Member]
Financing Receivable, Modifications [Line Items]
Total excluding purchased credit-impaired loans	21	21
Consumer portfolio [Member]
Financing Receivable, Modifications [Line Items]
Total excluding purchased credit-impaired loans	$ 300	$ 292

XML

Loans and Allowance for Loan Losses - Summary of Nonaccrual Loans (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 520	$ 505
Troubled debt restructured loans that continue to accrue interest	372	401
Troubled debt restructured nonaccrual loans (included in the total nonaccrual loans above)	223	209
Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	49	48
Commercial mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	57	65
Commercial portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	106	113
Residential mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	326	306
Home equity and other consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	59	56
Consumer portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	385	362
Nonaccrual loans, before purchased credit-impaired loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	491	475
Purchased Credit Impaired [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 29	$ 30

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Fair Value Measurement and Fair Value of Financial Instruments - Reconciliation of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) (Fair Value Measurements Recurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	$ 136
Included in income before taxes	47
Included in other comprehensive income
Purchases/additions, assets	3
Transfers into Level 3, assets		153
Sales
Settlements
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, end of period	186	153
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	47
Securities Available for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	1,499	48
Included in income before taxes
Included in other comprehensive income	19	(5)
Purchases/additions, assets	137
Transfers into Level 3, assets
Sales	(14)
Settlements	(49)
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, end of period	1,592	43
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period
Other assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, beginning of period
Included in income before taxes
Included in other comprehensive income
Purchases/additions, assets	1
Sales
Settlements
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, end of period	1
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period
Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	(136)
Included in income before taxes	(48)
Included in other comprehensive income
Purchases/additions, liability
Transfers into Level 3, liability		(153)
Sales	(3)
Settlements
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, ending of period	(187)	(153)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	(48)
Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	(95)	(51)
Included in income before taxes	(1)	(12)
Included in other comprehensive income
Purchases/additions, liability
Transfers into Level 3, liability
Sales
Settlements
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, ending of period	(96)	(63)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$ (1)	$ (12)

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Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Total troubled debt restructured loans	$ 591	$ 606
FDIC covered loans [Member]
Financing Receivable, Modifications [Line Items]
Total troubled debt restructured loans	$ 4	$ 4

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Derivative Instruments and Other Financial Instruments Used For Hedging - Gain or (Loss) Recognized in Income on Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative Instruments	$ 5	$ 26
Trading Derivatives [Member] | Interest rate derivative contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative Instruments	(1)	14
Trading Derivatives [Member] | Equity Derivative contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative Instruments	3	5
Trading Derivatives [Member] | Foreign exchange derivative contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative Instruments	3	7
Trading Derivatives [Member] | Commodity derivative contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative Instruments	(1)
Trading Derivatives [Member] | Other contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative Instruments	$ 1

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Loans and Allowance for Loan Losses - Reconciliation of Changes in Allowance for Loan Losses by Portfolio Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 653	$ 764	$ 764
(Reversal of) provision for loan losses	(3)	(1)	(28)
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification			(3)
Increase (Decrease) in allowance covered by FDIC indemnification	2		(5)
Loans charged off	(19)		(196)
Recoveries of loans previously charged off	5		65
Allowance for loan losses, end of period	638		653
Purchased Credit Impaired [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1	17	17
(Reversal of) provision for loan losses
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification			(3)
Increase (Decrease) in allowance covered by FDIC indemnification	2		(5)
Loans charged off	(3)		(13)
Recoveries of loans previously charged off	1		5
Allowance for loan losses, end of period	1		1
Commercial portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of period	418	474	474
(Reversal of) provision for loan losses	(68)		25
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification
Increase (Decrease) in allowance covered by FDIC indemnification
Loans charged off	(3)		(88)
Recoveries of loans previously charged off	3		57
Allowance for loan losses, end of period	486		418
Consumer portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of period	124	138	138
(Reversal of) provision for loan losses	(1)		(78)
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification
Increase (Decrease) in allowance covered by FDIC indemnification
Loans charged off	(13)		(95)
Recoveries of loans previously charged off	1		3
Allowance for loan losses, end of period	113		124
Unallocated portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of period	110	135	135
(Reversal of) provision for loan losses	72		25
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification
Increase (Decrease) in allowance covered by FDIC indemnification
Loans charged off
Recoveries of loans previously charged off
Allowance for loan losses, end of period	$ 38		$ 110

XML

Summary of Significant Accounting Policies and Nature of Operations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Accounting Policies [Abstract]
Fees on unused commitment balances	$ 12

XML

Derivative Instruments and Other Financial Instruments Used For Hedging - Summary of Offsetting Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/Liabilities, Financial Assets	$ 1,338	$ 1,443
Gross Amounts of Recognized Assets/Liabilities, Financial Liabilities	1,228	1,320
Financial Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/Liabilities, Financial Liabilities	1,268	1,325
Gross Amounts Offset in Balance Sheet, Financial Liabilities	507	449
Net Amounts Presented in Balance Sheet, Financial Liabilities	761	876
Net Amount, Financial Liabilities	253	259
Financial Liabilities [Member] | Securities purchased under resale agreements [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/Liabilities, Financial Liabilities	40	5
Net Amounts Presented in Balance Sheet, Financial Liabilities	40	5
Financial Liabilities [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/Liabilities, Financial Liabilities	1,228	1,320
Gross Amounts Offset in Balance Sheet, Financial Liabilities	507	449
Net Amounts Presented in Balance Sheet, Financial Liabilities	721	871
Net Amount, Financial Liabilities	253	259
Financial Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/Liabilities, Financial Assets	1,362	1,462
Gross Amounts Offset in Balance Sheet, Financial Assets	392	370
Net Amounts Presented in Balance Sheet, Financial Assets	970	1,092
Net Amount, Financial Assets	924	1,050
Financial Assets [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/Liabilities, Financial Assets	1,338	1,443
Gross Amounts Offset in Balance Sheet, Financial Assets	392	370
Net Amounts Presented in Balance Sheet, Financial Assets	946	1,073
Net Amount, Financial Assets	924	1,050
Financial Assets [Member] | Securities purchased under resale agreements [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/Liabilities, Financial Assets	24	19
Net Amounts Presented in Balance Sheet, Financial Assets	24	19
Financial Instruments [Member] | Financial Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Liabilities	507	496
Financial Instruments [Member] | Financial Liabilities [Member] | Securities purchased under resale agreements [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Liabilities	40	5
Financial Instruments [Member] | Financial Liabilities [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Liabilities	467	491
Financial Instruments [Member] | Financial Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Assets	41	40
Financial Instruments [Member] | Financial Assets [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Assets	17	21
Financial Instruments [Member] | Financial Assets [Member] | Securities purchased under resale agreements [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Assets	24	19
Cash Collateral Received/Pledged [Member] | Financial Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Liabilities	1	121
Cash Collateral Received/Pledged [Member] | Financial Liabilities [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Liabilities	1	121
Cash Collateral Received/Pledged [Member] | Financial Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Assets	5	2
Cash Collateral Received/Pledged [Member] | Financial Assets [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amount Not Offset in Balance Sheet, Financial Assets	$ 5	$ 2

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Fair Value Measurement and Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Certain Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents, Fair Value	$ 5,091	$ 5,491
Cash and cash equivalents, Carrying Amount	5,091	5,491
Securities held to maturity, Fair Value	1,036	1,135
Securities held to maturity, Carrying Amount	1,015	1,103
Loans held for investment, net of allowance for loan losses, Fair Value	60,489	59,613
Loans held for investment, net of allowance for loan losses, Carrying Amount	59,193	58,284
FDIC indemnification asset, Fair Value	153	151
FDIC indemnification asset, Carrying Amount	285	338
Other assets, Fair Value	3	3
Other assets, Carrying Amount	3	3
Liabilities
Deposits, Fair Value	74,254	74,524
Deposits, Carrying Amount	73,990	74,255
Commercial paper and other short-term borrowings, Fair Value	2,229	1,363
Commercial paper and other short-term borrowings, Carrying Amount	2,228	1,363
Long-term debt, Fair Value	5,512	5,861
Long-term debt, Carrying Amount	5,314	5,622
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit, Fair Value	279	262
Commitments to extend credit and standby and commercial letters of credit, Carrying Amount	279	262
Level 1 [Member]
Assets
Cash and cash equivalents, Fair Value	5,091	5,491
Securities held to maturity, Fair Value
Loans held for investment, net of allowance for loan losses, Fair Value
FDIC indemnification asset, Fair Value
Other assets, Fair Value
Liabilities
Deposits, Fair Value
Commercial paper and other short-term borrowings, Fair Value
Long-term debt, Fair Value
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit, Fair Value
Level 2 [Member]
Assets
Cash and cash equivalents, Fair Value
Securities held to maturity, Fair Value	1,036	1,135
Loans held for investment, net of allowance for loan losses, Fair Value
FDIC indemnification asset, Fair Value
Other assets, Fair Value
Liabilities
Deposits, Fair Value	74,254	74,524
Commercial paper and other short-term borrowings, Fair Value	2,229	1,363
Long-term debt, Fair Value	5,512	5,861
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit, Fair Value
Level 3 [Member]
Assets
Cash and cash equivalents, Fair Value
Securities held to maturity, Fair Value
Loans held for investment, net of allowance for loan losses, Fair Value	60,489	59,613
FDIC indemnification asset, Fair Value	153	151
Other assets, Fair Value	3	3
Liabilities
Deposits, Fair Value
Commercial paper and other short-term borrowings, Fair Value
Long-term debt, Fair Value
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit, Fair Value	$ 279	$ 262

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Loans and Allowance for Loan Losses - Recorded Investment Amounts of Troubled Debt Restructurings (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Financing Receivable, Modifications [Line Items]
Total troubled debt restructured loans at date of default	$ 7
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Total troubled debt restructured loans at date of default	5
Residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Total troubled debt restructured loans at date of default	$ 2

XML

Derivative Instruments and Other Financial Instruments Used For Hedging - Schedule of Derivatives Designated as Cash Flow Hedges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	7	2
Amount of Gain or (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)	6	10
Noninterest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Interest income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	7	2
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
Interest rate derivative contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)	$ 6	$ 10

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Accumulated Other Comprehensive Loss - Change in Accumulated Other Comprehensive Loss Balances (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Equity [Abstract]
Net Unrealized Gains (Losses) on Cash Flow Hedges, Beginning Balance	$ 24	$ (17)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Other comprehensive income before reclassifications	4	6
Net Unrealized Gains (Losses) on Cash Flow Hedges, Amounts reclassified from accumulated other comprehensive loss	(4)	(1)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Ending Balance	24	(12)
Net Unrealized Gains (Losses) on Securities, Beginning Balance	159	(107)
Net Unrealized Gains (Losses) on Securities, Other comprehensive income before reclassifications	(6)	51
Net Unrealized Gains (Losses) on Securities, Amounts reclassified from accumulated other comprehensive loss	(58)	(12)
Net Unrealized Gains (Losses) on Securities, Ending Balance	95	(68)
Foreign Currency Translation Adjustment, Beginning Balance	1
Foreign Currency Translation Adjustment, Other comprehensive income before reclassifications	(1)	1
Foreign Currency Translation Adjustment, Amounts reclassified from accumulated other comprehensive loss
Foreign Currency Translation Adjustment, Ending Balance		1
Pension and Other Benefits Adjustment, Beginning Balance	(698)	(685)
Pension and Other Benefits Adjustment, Other comprehensive income before reclassifications
Pension and Other Benefits Adjustment, Amounts reclassified from accumulated other comprehensive loss	18	16
Pension and Other Benefits Adjustment, Ending Balance	(680)	(669)
Accumulated Other Comprehensive Loss, Beginning Balance	(514)	(809)
Accumulated Other Comprehensive Loss, Other comprehensive income before reclassifications	(3)	58
Accumulated Other Comprehensive Loss, Amounts reclassified from accumulated other comprehensive loss	(44)	3
Accumulated Other Comprehensive Loss, Ending Balance	$ (561)	$ (748)

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Derivative Instruments and Other Financial Instruments Used For Hedging - Schedule of Derivatives Designated as Cash Flow Hedges (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Amount recognized relates to interest expenses	$ 1

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Fair Value Measurement and Fair Value of Financial Instruments - Significant Unobservable Inputs Level 3 Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Minimum [Member] Return on equity [Member]	Mar. 31, 2013 Minimum [Member] Discounted cash flow [Member]	Mar. 31, 2013 Maximum [Member] Return on equity [Member]	Mar. 31, 2013 Maximum [Member] Discounted cash flow [Member]	Mar. 31, 2013 Weighted Average [Member] Return on equity [Member]	Mar. 31, 2013 Weighted Average [Member] Discounted cash flow [Member]	Mar. 31, 2013 Level 3 [Member] Direct bank purchase bonds [Member]	Mar. 31, 2013 Level 3 [Member] FDIC clawback liability [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Market-required return on capital			13.00%		15.00%		14.10%
Probability of default			0.00%	0.20%	8.00%	100.00%	0.60%	57.10%
Loss severity			10.00%	20.00%	75.00%	100.00%	37.20%	51.00%
Securities available for sale	$ 21,801	$ 21,352							$ 1,532
Other liabilities	$ 1,821	$ 2,102								$ 93

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Employee Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

The following table summarizes the components of net periodic benefit cost for the first quarters of 2013 and 2012:

	Pension Benefits						Other Benefits						Superannuation, SERP(1) and  ESBP(2)
	For the Three Months Ended March 31,						For the Three Months Ended March 31,						For the Three Months Ended March 31,
(Dollars in millions)	2013			2012			2013			2012			2013		2012
Components of net periodic benefit cost:
Service cost	$	22		$	18		$	4		$	3		$	—	$	—
Interest cost		25			26			3			3			1		1
Expected return on plan assets		(41	)		(37	)		(4	)		(3	)		—		—
Recognized net actuarial loss		27			23			1			2			1		1
Total net periodic benefit cost	$	33		$	30		$	4		$	5		$	2	$	2

⁽¹⁾  Supplemental Executives Retirement Plan (SERP).

⁽²⁾ Executive Supplemental Benefit Plans (ESBP).

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Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans 90 days or more past due and still accruing	$ 3	$ 1
Total loans held for investment	60,882	60,034
Commitment to lend additional funds to borrowers with loan modifications classified as TDRs	45
TDR modifications charge-offs	1
Minimum defaulting period	60
Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans from held for investment to held for sale	148
Loans receivable sold during the period	160
FDIC Covered Loan [Member] | Commercial portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	327	365
FDIC Covered Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	49	57
Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans 90 days or more past due and still accruing	$ 125	$ 124

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Securities - Carrying Amount and Fair Value of Securities Held to Maturity by Contractual Maturity (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Over One Year Through Five Years, Carrying Amount	$ 64
Over One Year Through Five Years, Fair Value	78
Over Ten Years, Carrying Amount	951
Over Ten Years, Fair Value	958
Total securities held to maturity, Carrying Amount	1,015	1,103
Total securities held to maturity, Fair Value	1,036	1,135
Collateralized loan obligations (CLOs) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Over One Year Through Five Years, Carrying Amount	64
Over One Year Through Five Years, Fair Value	78
Over Ten Years, Carrying Amount
Over Ten Years, Fair Value
Total securities held to maturity, Carrying Amount	64	101
Total securities held to maturity, Fair Value	78	121
U.S. government agency and government sponsored agencies-residential mortgage backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Over One Year Through Five Years, Carrying Amount
Over One Year Through Five Years, Fair Value
Over Ten Years, Carrying Amount	951
Over Ten Years, Fair Value	958
Total securities held to maturity, Carrying Amount	951	1,002
Total securities held to maturity, Fair Value	$ 958	$ 1,014

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Derivative Instruments and Other Financial Instruments Used For Hedging - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Income from accumulated other comprehensive income to net interest income	$ 23,000,000
Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Weighted average remaining life of the currently active cash flow hedges	1 year 1 month 6 days
LIBOR indexed borrowings [Member] | Interest rate caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	700,000,000
Short-term fixed rate certificates of deposit [Member] | Interest rate caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	1,400,000,000
LIBOR indexed loans [Member] | Interest rate swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 5,300,000,000

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Securities - Securities Available for Sale with Continuous Unrealized Loss (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value	$ 6,647	$ 3,112
Securities available for sale, Less than 12 months, Unrealized Losses	95	84
Securities available for sale, 12 months or more, Fair Value	488	1,146
Securities available for sale, 12 months or more, Unrealized Losses	14	54
Securities available for sale, Fair Value, Total	7,135	4,258
Securities available for sale, Unrealized Losses, Total	109	138
U.S. government agency and government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value	3,693	1,152
Securities available for sale, Less than 12 months, Unrealized Losses	15	3
Securities available for sale, 12 months or more, Fair Value	1	13
Securities available for sale, 12 months or more, Unrealized Losses
Securities available for sale, Fair Value, Total	3,694	1,165
Securities available for sale, Unrealized Losses, Total	15	3
Privately issued [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value	21	32
Securities available for sale, Less than 12 months, Unrealized Losses
Securities available for sale, 12 months or more, Fair Value	139	137
Securities available for sale, 12 months or more, Unrealized Losses	3	10
Securities available for sale, Fair Value, Total	160	169
Securities available for sale, Unrealized Losses, Total	3	10
Commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value	1,637	675
Securities available for sale, Less than 12 months, Unrealized Losses	21	6
Securities available for sale, 12 months or more, Fair Value
Securities available for sale, 12 months or more, Unrealized Losses
Securities available for sale, Fair Value, Total	1,637	675
Securities available for sale, Unrealized Losses, Total	21	6
Collateralized loan obligations (CLOs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value	262	168
Securities available for sale, Less than 12 months, Unrealized Losses	2	1
Securities available for sale, 12 months or more, Fair Value	309	980
Securities available for sale, 12 months or more, Unrealized Losses	8	43
Securities available for sale, Fair Value, Total	571	1,148
Securities available for sale, Unrealized Losses, Total	10	44
Asset-backed and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value		32
Securities available for sale, Less than 12 months, Unrealized Losses
Securities available for sale, 12 months or more, Fair Value		3
Securities available for sale, 12 months or more, Unrealized Losses
Securities available for sale, Fair Value, Total		35
Securities available for sale, Unrealized Losses, Total
Asset Liability Management securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value	5,613	2,059
Securities available for sale, Less than 12 months, Unrealized Losses	38	10
Securities available for sale, 12 months or more, Fair Value	449	1,133
Securities available for sale, 12 months or more, Unrealized Losses	11	53
Securities available for sale, Fair Value, Total	6,062	3,192
Securities available for sale, Unrealized Losses, Total	49	63
Direct bank purchase bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value	1,028	1,019
Securities available for sale, Less than 12 months, Unrealized Losses	56	71
Securities available for sale, 12 months or more, Fair Value
Securities available for sale, 12 months or more, Unrealized Losses
Securities available for sale, Fair Value, Total	1,028	1,019
Securities available for sale, Unrealized Losses, Total	56	71
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months, Fair Value	6	34
Securities available for sale, Less than 12 months, Unrealized Losses	1	3
Securities available for sale, 12 months or more, Fair Value	39	13
Securities available for sale, 12 months or more, Unrealized Losses	3	1
Securities available for sale, Fair Value, Total	45	47
Securities available for sale, Unrealized Losses, Total	$ 4	$ 4

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Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Segment Monitored for Credit Quality (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule Of Financing Receivables Accrual And Non Accrual Status [Line Items]
Total consumer portfolio	$ 23,146	$ 22,705
Total consumer portfolio	3,542	3,647
Nonaccrual	520	505
Total consumer portfolio	26,688	26,352
Residential mortgage [Member]
Schedule Of Financing Receivables Accrual And Non Accrual Status [Line Items]
Total consumer portfolio	23,146	22,705
Accrual	22,820	22,399
Nonaccrual	326	306
Home equity and other consumer loans [Member]
Schedule Of Financing Receivables Accrual And Non Accrual Status [Line Items]
Total consumer portfolio	3,542	3,647
Accrual	3,483	3,591
Nonaccrual	59	56
Total consumer portfolio [Member]
Schedule Of Financing Receivables Accrual And Non Accrual Status [Line Items]
Accrual	26,303	25,990
Nonaccrual	385	362
Total consumer portfolio	26,688	26,352
Purchased Credit Impaired [Member]
Schedule Of Financing Receivables Accrual And Non Accrual Status [Line Items]
Accrual	282	288
Nonaccrual	29	30
Total consumer portfolio	282	288
Consumer portfolio [Member]
Schedule Of Financing Receivables Accrual And Non Accrual Status [Line Items]
Accrual	26,585	26,278
Nonaccrual	385	362
Total consumer portfolio	$ 26,970	$ 26,640

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Long-Term Debt - Summary of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 5,314	$ 5,622
UnionBanCal Corporation [Member]
Debt Instrument [Line Items]
Long-term debt	801	803
Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	4,513	4,819
Senior debt [Member] | Fixed rate 3.50% notes due June 2022 [Member] | UnionBanCal Corporation [Member]
Debt Instrument [Line Items]
Long-term debt	397	397
Senior debt [Member] | Federal Home Loan Bank advances [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	1,800	2,100
Senior debt [Member] | Floating rate notes due June 2014 [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	300	300
Senior debt [Member] | Fixed rate 2.125% notes due December 2013 [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	400	399
Senior debt [Member] | Fixed rate 3.00% notes due June 2016 [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	699	699
Senior debt [Member] | Fixed rate 2.125% notes due June 2017 [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	499	499
Subordinated Debt [Member] | Fixed rate 5.25% notes due December 2013 [Member] | UnionBanCal Corporation [Member]
Debt Instrument [Line Items]
Long-term debt	404	406
Subordinated Debt [Member] | Fixed rate 5.95% notes due May 2016 [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	726	729
Note payable [Member] | Fixed rate 6.03% notes due July 2014 (related to consolidated VIE) [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	6	6
Junior subordinated debt payable to trusts [Member] | Floating rate [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	66	66
Junior subordinated debt payable to trusts [Member] | Capital Lease Obligations [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt	$ 17	$ 21

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Loans and Allowance for Loan Losses - Changes in Accretable Balance for Purchased Credit-Impaired Loans (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Receivables [Abstract]
Accretable yield, beginning of period	$ 590	$ 424
Additions
Accretion	(79)	(63)
Reclassifications from nonaccretable difference during the period	(10)	80
Accretable yield, end of period	$ 501	$ 441

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Loans and Allowance for Loan Losses - Allowance for Loan Losses and Related Loan Balances by Portfolio Segment (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses:
Individually evaluated for impairment	49	42
Collectively evaluated for impairment	588	610
Purchased credit-impaired loans	1	1
Loans held for investment:
Individually evaluated for impairment	619	627
Total loans held for investment	1,124	1,185
Collectively evaluated for impairment	59,143	58,227
Total loans held for investment	60,882	60,034
Purchased credit-impaired loans	1,120	1,180
Total allowance for loan losses	638	653	764
Total loans held for investment	33,070	32,497
Total loans held for investment	26,688	26,352
Purchased Credit Impaired [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses:
Individually evaluated for impairment
Collectively evaluated for impairment
Purchased credit-impaired loans	1	1
Loans held for investment:
Individually evaluated for impairment	4	5
Total loans held for investment	1,124	1,185
Collectively evaluated for impairment
Purchased credit-impaired loans	1,120	1,180
Total allowance for loan losses	1	1	17
Commercial portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses:
Individually evaluated for impairment	32	24
Collectively evaluated for impairment	454	394
Purchased credit-impaired loans
Loans held for investment:
Individually evaluated for impairment	315	330
Collectively evaluated for impairment	32,755	32,167
Purchased credit-impaired loans
Total allowance for loan losses	486	418	474
Total loans held for investment	33,070	32,497
Consumer portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses:
Individually evaluated for impairment	17	18
Collectively evaluated for impairment	96	106
Purchased credit-impaired loans
Loans held for investment:
Individually evaluated for impairment	300	292
Collectively evaluated for impairment	26,388	26,060
Purchased credit-impaired loans
Total allowance for loan losses	113	124	138
Total loans held for investment	26,688	26,352
Unallocated portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses:
Individually evaluated for impairment
Collectively evaluated for impairment	38	110
Purchased credit-impaired loans
Loans held for investment:
Individually evaluated for impairment
Collectively evaluated for impairment
Purchased credit-impaired loans
Total allowance for loan losses	$ 38	$ 110	$ 135

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Business Combinations

3 Months Ended

Mar. 31, 2013

Business Combinations [Abstract]

Business Combinations

Note 2—Business Combinations

On December 1, 2012, the Company completed its acquisition of Pacific Capital Bancorp (PCBC), a bank holding company headquartered in Santa Barbara, California, for $1.5 billion in cash.

The assets acquired and liabilities assumed from PCBC were recorded at their estimated fair values on the acquisition date. These fair value estimates are considered provisional, as additional analysis will be performed on certain assets and liabilities in which fair values were primarily determined through the use of inputs that were not observable from market-based information. During the first quarter of 2013, management reviewed and, where necessary, adjusted the acquisition date fair values for circumstances that existed as of the acquisition date. Management may further adjust the provisional fair values for a period of up to one year from the date of acquisition. The assets and liabilities that continue to be provisional include loans, intangible assets, OREO, and the residual effects the adjustments would have on goodwill.

The following table presents the net assets acquired from PCBC and the estimated purchase accounting adjustments, which include the effects of measurement period adjustments that were applied to the acquisition date fair values during the first quarter of 2013. These adjustments increased goodwill by $10 million.

(Dollars in millions)	December 1, 2012			Adjustments			December 1, 2012 (adjusted)
Purchase price	$	1,516		$	—		$	1,516
Net assets acquired		859			—			859
Purchase accounting adjustments:
Securities available for sale		8			—			8
Loans held for investment		141			5			146
Intangible assets		18			(19	)		(1	)
Other assets		128			8			136
Deposits		(12	)		—			(12	)
Other short-term borrowings		(36	)		—			(36	)
Long-term debt		(14	)		4			(10	)
Other liabilities		11			(8	)		3
Total purchase accounting adjustments		244			(10	)		234
Fair value of net assets acquired		1,103			(10	)		1,093
Goodwill	$	413		$	10		$	423

For further information related to the PCBC acquisition, see Note 2 to the consolidated financial statements in the Company’s 2012 Form 10-K. For further information related to goodwill, see Note 5 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Acquisition of PB Capital

On April 7, 2013, the Company announced that it reached an agreement to acquire PB Capital Corporation’s (PB Capital) institutional commercial real estate (CRE) lending division. The acquisition will expand the Company’s CRE presence in the U.S., and provide geographic and asset class diversification. Headquartered in New York, the CRE lending division of PB Capital has approximately $3.7 billion in loans outstanding on properties in major metropolitan areas across the U.S. The acquisition is subject to certain customary closing conditions and is expected to be completed in the second quarter of 2013.

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Variable Interest Entities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Variable Interest Entity [Line Items]
Expenses related to consolidated VIEs	$ 108	$ 99
Revenue related to consolidated VIEs	2
LIHC investments [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated VIEs	293
Carrying amount of liabilities, consolidated VIEs	7
Number of LIHC investment fund	2
Trusts owned and lease railcars [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated VIEs	99
Consolidated VIEs, net of liabilities [Member]
Variable Interest Entity [Line Items]
Expenses related to consolidated VIEs	$ 7	$ 7

XML

Securities - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities available for sale pledged as collateral	$ 7,000,000,000
Borrowings [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities available for sale pledged as collateral	800,000,000
Derivative [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities available for sale pledged as collateral	500,000,000
Public and trust deposits [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities available for sale pledged as collateral	5,700,000,000
Permitted by contract to sell or repledge	24,000,000	19,000,000
Repledged to secure public agency or bankruptcy deposits and to cover short sales	$ 0	$ 0

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Derivative Instruments and Other Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Notional Amounts, Balance Sheet Location and Fair Value Amounts of Derivative Instruments

Asset and liability values are presented gross, excluding the impact of legally enforceable master netting and CSA agreements.

	March 31, 2013
			Asset Derivatives			Liability Derivatives
(Dollars in millions)	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Total derivatives designated as hedging instruments:
Interest rate contracts	$	7,350	Other assets	$	24	Other liabilities	$	—
Derivatives not designated as hedging instruments:
Interest rate contracts	$	39,545	Trading account assets	$	966	Trading account liabilities	$	898
Commodity contracts		5,703	Trading account assets		137	Trading account liabilities		116
Foreign exchange contracts		4,249	Trading account assets		54	Trading account liabilities		53
Equity contracts		3,691	Trading account assets		156	Trading account liabilities		157
Other contracts		89	Other assets		1	Other liabilities		4
Total derivatives not designated as hedging instruments	$	53,277		$	1,314		$	1,228
Total derivative instruments	$	60,627		$	1,338		$	1,228
	December 31, 2012
			Asset Derivatives			Liability Derivatives
(Dollars in millions)	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Total derivatives designated as hedging instruments:
Interest rate contracts	$	8,400	Other assets	$	28	Other liabilities	$	—
Derivatives not designated as hedging instruments:
Interest rate contracts	$	37,790	Trading account assets	$	1,075	Trading account liabilities	$	1,009
Commodity contracts		5,595	Trading account assets		167	Trading account liabilities		140
Foreign exchange contracts		4,593	Trading account assets		69	Trading account liabilities		65
Equity contracts		3,631	Trading account assets		103	Trading account liabilities		103
Other contracts		109	Other assets		1	Other liabilities		3
Total derivatives not designated as hedging instruments	$	51,718		$	1,415		$	1,320
Total derivative instruments	$	60,118		$	1,443		$	1,320

Schedule of Derivatives Designated as Cash Flow Hedges

The following tables present the amount and location of the net gains and losses recorded in the Company’s consolidated statements of income and changes in stockholder’s equity for derivatives designated as cash flow hedges for the first quarters of 2013 and 2012:

	Amount of Gain or (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)				Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)					Gain or (Loss) Recognized in Income on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	For the Three Months Ended March 31,					For the Three Months Ended March 31,					For the Three Months Ended March 31,
(Dollars in millions)	2013		2012		Location	2013		2012		Location	2013		2012
Derivatives in cash flow hedging relationships
					Interest income	$	7	$	2
Interest rate contracts	$	6	$	10	Interest expense(1)		—		—	Noninterest expense(1)	$	—	$	—
Total	$	6	$	10		$	7	$	2		$	—	$	—

⁽¹⁾  Amount recognized was less than $1 million.

Gain or (Loss) Recognized in Income on Derivative Instruments

The following table presents the amount of the net gains and losses reported in the consolidated statement of income under the heading trading account activities for derivative instruments classified as trading for the first quarters of 2013 and 2012:

	Gain or (Loss) Recognized in Income on Derivative Instruments
	For the Three Months Ended
(Dollars in millions)	March 31, 2013			March 31, 2012
Trading derivatives:
Interest rate contracts	$	(1	)	$	14
Equity contracts		3			5
Foreign exchange contracts		3			7
Commodity contracts		(1	)		—
Other contracts		1			—
Total	$	5		$	26

Summary of Offsetting Assets and Liabilities

The following tables present the offsetting of financial assets and liabilities as of March 31, 2013 and December 31, 2012:

	March 31, 2013
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative Assets	$	1,338	$	392	$	946	$	17	$	5	$	924
Securities purchased under resale agreements		24		—		24		24		—		—
Total	$	1,362	$	392	$	970	$	41	$	5	$	924
Financial Liabilities:
Derivative Liabilities	$	1,228	$	507	$	721	$	467	$	1	$	253
Securities sold under repurchase agreements		40		—		40		40		—		—
Total	$	1,268	$	507	$	761	$	507	$	1	$	253

	December 31, 2012
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative Assets	$	1,443	$	370	$	1,073	$	21	$	2	$	1,050
Securities purchased under resale agreements		19		—		19		19		—		—
Total	$	1,462	$	370	$	1,092	$	40	$	2	$	1,050
Financial Liabilities:
Derivative Liabilities	$	1,320	$	449	$	871	$	491	$	121	$	259
Securities sold under repurchase agreements		5		—		5		5		—		—
Total	$	1,325	$	449	$	876	$	496	$	121	$	259

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Fair Value Measurement and Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis

The following tables present financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2013 and December 31, 2012, by major category and by valuation hierarchy level:

	March 31, 2013
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets:
U.S. Treasury	$	—		$	51		$	—		$	—		$	51
U.S. government sponsored agencies		—			108			—			—			108
State and municipal		—			5			—			—			5
Commercial paper		—			10			—			—			10
Interest rate derivative contracts		—			966			—			(91	)		875
Commodity derivative contracts		—			111			26			(107	)		30
Foreign exchange derivative contracts		1			49			4			(27	)		27
Equity derivative contracts		—			—			156			(143	)		13
Total trading account assets		1			1,300			186			(368	)		1,119
Securities available for sale:
U.S. government sponsored agencies		—			472			—			—			472
Residential mortgage-backed securities:
U.S. government and government sponsored agencies		—			13,281			—			—			13,281
Privately issued		—			362			—			—			362
Commercial mortgage-backed securities		—			3,563			—			—			3,563
CLOs		—			2,302			—			—			2,302
Asset-backed and other		—			100			—			—			100
Other debt securities:
Direct bank purchase bonds		—			—			1,532			—			1,532
Other		—			98			60			—			158
Equity securities		31			—			—			—			31
Total securities available for sale		31			20,178			1,592			—			21,801
Other assets:
Interest rate hedging contracts		—			24			—			(24	)		—
Other derivative contracts		—			—			1			—			1
Total other assets		—			24			1			(24	)		1
Total assets	$	32		$	21,502		$	1,779		$	(392	)	$	22,921
Percentage of Total		—	%		94	%		8	%		(2	)%		100	%
Percentage of Total Company Assets		—	%		22	%		2	%		—	%		24	%
Liabilities
Trading account liabilities:
Interest rate derivative contracts	$	4		$	894		$	—		$	(452	)	$	446
Commodity derivative contracts		—			90			26			(48	)		68
Foreign exchange derivative contracts		1			48			4			(6	)		47
Equity derivative contracts		—			—			157			—			157
Securities sold, not yet purchased		—			24			—			—			24
Total trading account liabilities		5			1,056			187			(506	)		742
Other liabilities:
FDIC clawback liability		—			—			93			—			93
Other derivative contracts		—			1			3			(1	)		3
Total other liabilities		—			1			96			(1	)		96
Total liabilities	$	5		$	1,057		$	283		$	(507	)	$	838
Percentage of Total		—	%		126	%		34	%		(60	)%		100	%
Percentage of Total Company Liabilities		—			1	%		—			—			1	%

⁽¹⁾  Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.

	December 31, 2012
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets:
U.S. Treasury	$	—		$	1		$	—		$	—		$	1
U.S. government sponsored agencies		—			113			—			—			113
State and municipal		—			15			—			—			15
Commercial paper		—			10			—			—			10
Interest rate derivative contracts		—			1,075			—			(87	)		988
Commodity derivative contracts		—			137			30			(127	)		40
Foreign exchange derivative contracts		1			65			3			(28	)		41
Equity derivative contracts		—			—			103			(103	)		—
Total trading account assets		1			1,416			136			(345	)		1,208
Securities available for sale:
U.S. Treasury		—			—			—			—			—
U.S. government sponsored agencies		—			885			—			—			885
Residential mortgage-backed securities:
U.S government and government sponsored agencies		—			13,333			—			—			13,333
Privately issued		—			443			—			—			443
Commercial mortgage-backed securities		—			2,971			—			—			2,971
CLOs		—			1,959			—			—			1,959
Asset-backed and other		—			146			—			—			146
Other debt securities:
Direct bank purchase bonds		—			—			1,438			—			1,438
Other		—			97			61			—			158
Equity securities		19			—			—			—			19
Total securities available for sale		19			19,834			1,499			—			21,352
Other assets:
Interest rate hedging contracts		—			28			—			(24	)		4
Other derivative contracts		—			1			—			(1	)		—
Total other assets		—			29			—			(25	)		4
Total assets	$	20		$	21,279		$	1,635		$	(370	)	$	22,564
Percentage of Total		—			94	%		7	%		(1	)%		100	%
Percentage of Total Company Assets		—			22	%		1	%		—			23	%
Liabilities
Trading account liabilities:
Interest rate derivative contracts	$	5		$	1,004		$	—		$	(407	)	$	602
Commodity derivative contracts		—			110			30			(42	)		98
Foreign exchange derivative contracts		1			61			3			—			65
Equity derivative contracts		—			—			103			—			103
Securities sold, not yet purchased		—			27			—			—			27
Total trading account liabilities		6			1,202			136			(449	)		895
Other liabilities:
FDIC clawback liability		—			—			92			—			92
Other derivative contracts		—			—			3			—			3
Total other liabilities		—			—			95			—			95
Total liabilities	$	6		$	1,202		$	231		$	(449	)	$	990
Percentage of Total		1	%		121	%		23	%		(45	)%		100	%
Percentage of Total Company Liabilities		—			2	%		—			(1	)%		1	%

⁽¹⁾  Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.

Reconciliation of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs

The following tables present a reconciliation of the assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the first quarters of 2013 and 2012. Level 3 available for sale securities at March 31, 2013 and 2012 primarily consisted of direct bank purchase bonds. The Company’s policy is to recognize transfers in and out of Level 1, 2 and 3 as of the end of a reporting period. In the first quarter of 2012, the Company, based on its analysis, transferred its U.S. Treasury and U.S. government sponsored agency securities from Level 1 to Level 2 and certain of its derivative contracts from Level 2 to Level 3.

	For the Three Months Ended
	March 31, 2013
(Dollars in millions)	Trading Assets		Securities Available for Sale			Other Assets		Trading Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	136	$	1,499		$	—	$	(136	)	$	(95	)
Total gains (losses) (realized/unrealized):
Included in income before taxes		47		—			—		(48	)		(1	)
Included in other comprehensive income		—		19			—		—			—
Purchases/additions		3		137			1		—			—
Sales		—		(14	)		—		(3	)		—
Settlements		—		(49	)		—		—			—
Asset (liability) balance, end of period	$	186	$	1,592		$	1	$	(187	)	$	(96	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	47	$	—		$	—	$	(48	)	$	(1	)

	For the Three Months Ended
	March 31, 2012
(Dollars in millions)	Trading Assets		Securities Available for Sale			Trading Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	—	$	48		$	—		$	(51	)
Total gains (losses) (realized/unrealized):
Included in income before taxes		—		—			—			(12	)
Included in other comprehensive income		—		(5	)		—			—
Transfers into Level 3		153		—			(153	)		—
Asset (liability) balance, end of period	$	153	$	43		$	(153	)	$	(63	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	—	$	—		$	—		$	(12	)

Significant Unobservable Inputs Level 3 Assets and Liabilities

The following table presents information about significant unobservable inputs related to the Company’s significant Level 3 assets and liabilities at March 31, 2013.

	March 31, 2013
(Dollars in millions)	Level 3 Fair Value		Valuation Technique(s)	Significant Unobservable Input(s)	Range of Inputs			Weighted Average
Securities available for sale:
Direct bank purchase bonds	$	1,532	Return on equity	Market-required return on capital		13.0 - 15.0	%		14.1	%
				Probability of default		0.0 - 8.0	%		0.6	%
				Loss severity		10.0 - 75.0	%		37.2	%
Other liabilities:
FDIC clawback liability	$	93	Discounted cash flow	Probability of default		0.2 - 100.0	%		57.1	%
				Loss severity		20.0 - 100.0	%		51.0	%

Financial Assets Measured at Fair Value on Nonrecurring Basis

For assets measured at fair value on a nonrecurring basis during the first quarters of 2013 and 2012 that were still held on the consolidated balance sheet as of the respective periods ended, the following tables present the fair value of such financial instruments by the level of valuation assumptions used to determine each fair value adjustment:

	March 31, 2013								Loss for the Three Months Ended March 31, 2013
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3
Loans:
Impaired loans	$	90	$	—	$	—	$	90	$	(12	)
Other assets:
OREO		38		—		—		38		(3	)
Total	$	128	$	—	$	—	$	128	$	(15	)
	March 31, 2012								Loss for the Three Months Ended March 31, 2012
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3
Loans:
Impaired loans	$	58	$	—	$	—	$	58	$	(3	)
Other assets:
OREO		71		—		—		71		(8	)
Private equity investments		27		—		—		27		(2	)
Total	$	156	$	—	$	—	$	156	$	(13	)

Carrying Amount and Estimated Fair Value of Certain Financial Instruments

The tables below present the carrying amount and estimated fair value of certain financial instruments by the level of valuation assumptions held by the Company as of March 31, 2013, and the carrying amount and the estimated fair value at December 31, 2012:

	March 31, 2013
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	5,091	$	5,091	$	5,091	$	—	$	—
Securities held to maturity		1,015		1,036		—		1,036		—
Loans held for investment, net of allowance for loan losses(1)		59,193		60,489		—		—		60,489
FDIC indemnification asset		285		153		—		—		153
Other assets		3		3		—		—		3
Liabilities
Deposits	$	73,990	$	74,254	$	—	$	74,254	$	—
Commercial paper and other short-term borrowings		2,228		2,229		—		2,229		—
Long-term debt		5,314		5,512		—		5,512		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	279	$	279	$	—	$	—	$	279

⁽¹⁾  Excludes lease financing, net of related allowance.

	December 31, 2012
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	5,491	$	5,491	$	5,491	$	—	$	—
Securities held to maturity		1,103		1,135		—		1,135		—
Loans held for investment, net of allowance for loan losses(1)		58,284		59,613		—		—		59,613
FDIC indemnification asset		338		151		—		—		151
Other assets		3		3		—		—		3
Liabilities
Deposits	$	74,255	$	74,524	$	—	$	74,524	$	—
Commercial paper and other short-term borrowings		1,363		1,363		—		1,363		—
Long-term debt		5,622		5,861		—		5,861		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	262	$	262	$	—	$	—	$	262

⁽¹⁾  Excludes lease financing, net of related allowance.

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Loans and Allowance for Loan Losses - Pre- and Post-Modification Outstanding Recorded Investment Amounts of Troubled Debt Restructurings (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 113	[1]
Post-Modification Outstanding Recorded Investment	110	[2]
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	76	[1]
Post-Modification Outstanding Recorded Investment	74	[2]
Commercial mortgage [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	11	[1]
Post-Modification Outstanding Recorded Investment	11	[2]
Commercial portfolio [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	87	[1]
Post-Modification Outstanding Recorded Investment	85	[2]
Residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	25	[1]
Post-Modification Outstanding Recorded Investment	24	[2]
Home equity and other consumer loans [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	1	[1]
Post-Modification Outstanding Recorded Investment	1	[2]
Consumer portfolio [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	26	[1]
Post-Modification Outstanding Recorded Investment	$ 25	[2]

[1] Represents the recorded investment in the loan immediately prior to the restructuring event.

[2] Represents the recorded investment in the loan immediately following the restructuring event. It includes the effect of paydowns that were required as part of the restructuring terms.

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Loans and Allowance for Loan Losses - Summary of Loans (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Commercial and industrial	$ 21,433	$ 20,827
Commercial mortgage	9,918	9,939
Construction	659	627
Lease financing	1,060	1,104
Total commercial portfolio	33,070	32,497
Residential mortgage	23,146	22,705
Home equity and other consumer loans	3,542	3,647
Total consumer portfolio	26,688	26,352
Total loans held for investment, before purchased credit-impaired loans	59,758	58,849
Purchased credit-impaired loans	1,124	1,185
Total loans held for investment	60,882	60,034
Allowance for loan losses	(638)	(653)
Loans held for investment, net	$ 60,244	$ 59,381

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Components of Accumulated Other Comprehensive Loss

The following table presents the change in each of the components of accumulated other comprehensive loss and the related tax effect of the change allocated to each component:

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended March 31, 2012:
Cash flow hedge activities:
Unrealized net gains on hedges arising during the period	$	10		$	(4	)	$	6
Less: Reclassification adjustment for net losses on hedges included in net income		(2	)		1			(1	)
Net change in unrealized losses on hedges		8			(3	)		5
Securities:
Unrealized holding gains arising during the period on securities available for sale		61			(24	)		37
Reclassification adjustment for net gains on securities available for sale included in net income		(19	)		7			(12	)
Less: accretion of fair value adjustment on securities available for sale		(1	)		—			(1	)
Less: accretion of fair value adjustment on held to maturity securities		(6	)		3			(3	)
Less: amortization of net unrealized losses on held to maturity securities		29			(11	)		18
Net change in unrealized losses on securities		64			(25	)		39
Foreign currency translation adjustment		1			—			1
Reclassification adjustment for pension and other benefits included in net income:
Recognized net actuarial loss(1)		26			(10	)		16
Net change in pension and other benefits(1)		26			(10	)		16
Net change in accumulated other comprehensive loss	$	99		$	(38	)	$	61
For the Three Months Ended March 31, 2013:
Cash flow hedge activities:
Unrealized net gains on hedges arising during the period	$	6		$	(2	)	$	4
Less: Reclassification adjustment for net losses on hedges included in interest income for loans and interest expense on long-term debt		(7	)		3			(4	)
Net change in unrealized gains on hedges		(1	)		1			—
Securities:
Reclassification adjustment for net gains on securities available for sale included in securities gains, net		(96	)		38			(58	)
Less: accretion of fair value adjustment on securities available for sale		(15	)		6			(9	)
Less: accretion of fair value adjustment on held to maturity securities		(8	)		3			(5	)
Less: amortization of net unrealized losses on held to maturity securities		14			(6	)		8
Net change in unrealized gains on securities		(105	)		41			(64	)
Foreign currency translation adjustment		(2	)		1			(1	)
Reclassification adjustment for pension and other benefits included in net income:
Recognized net actuarial loss(1)		29			(11	)		18
Net change in pension and other benefits(1)		29			(11	)		18
Net change in accumulated other comprehensive loss	$	(79	)	$	32		$	(47	)

⁽¹⁾  These amounts are included in the computation of net periodic pension cost. For further information, see Note 6 to these consolidated financial statements.

Change in Accumulated Other Comprehensive Loss Balances

The following table presents the change in accumulated other comprehensive loss balances:

(Dollars in millions)	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Benefits Adjustment			Accumulated Other Comprehensive Loss
Balance, December 31, 2011	$	(17	)	$	(107	)	$	—		$	(685	)	$	(809	)
Other comprehensive income before reclassifications		6			51			1			—			58
Amounts reclassified from accumulated other comprehensive loss		(1	)		(12	)		—			16			3
Balance, March 31, 2012	$	(12	)	$	(68	)	$	1		$	(669	)	$	(748	)
Balance, December 31, 2012	$	24		$	159		$	1		$	(698	)	$	(514	)
Other comprehensive income before reclassifications		4			(6	)		(1	)		—			(3	)
Amounts reclassified from accumulated other comprehensive loss		(4	)		(58	)		—			18			(44	)
Balance, March 31, 2013	$	24		$	95		$	—		$	(680	)	$	(561	)

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Commitments, Contingencies and Guarantees (Tables)

3 Months Ended

Mar. 31, 2013

Commitments And Contingencies Disclosure [Abstract]

Summary of Commitments

The following table summarizes the Company’s commitments:

(Dollars in millions)	March 31, 2013
Commitments to extend credit	$	28,999
Standby and commercial letters of credit		5,930
Other commitments		712

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Summary of Significant Accounting Policies and Nature of Operations

3 Months Ended

Mar. 31, 2013

Accounting Policies [Abstract]

Summary of Significant Accounting Policies and Nature of Operations

Note 1—Summary of Significant Accounting Policies and Nature of Operations

The unaudited consolidated financial statements of UnionBanCal Corporation, its subsidiaries, and its consolidated variable interest entities (the Company) have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial reporting and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Rules and Regulations of the Securities and Exchange Commission (SEC). However, they do not include all of the disclosures necessary for annual financial statements. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation have been included. The results of operations for the first quarter of 2013 are not necessarily indicative of the operating results anticipated for the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in UnionBanCal Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012 (2012 Form 10-K).

The preparation of financial statements in conformity with U.S. GAAP also requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Although such estimates contemplate current conditions and management’s expectations of how they may change in the future, it is reasonably possible that actual results could differ significantly from those estimates. This could materially affect the Company’s results of operations and financial condition in the near term. Significant estimates made by management in the preparation of the Company’s financial statements include, but are not limited to, the evaluation of other-than-temporary impairment on investment securities (Note 3), allowance for credit losses (Note 4), purchased credit-impaired loans (Note 4), annual goodwill impairment analysis, pension accounting (Note 6), fair value of financial instruments (Note 9), and income taxes.

UnionBanCal Corporation is a financial holding company and bank holding company whose principal subsidiary is Union Bank, N.A. (the Bank). The Company provides a wide range of financial services to consumers, small businesses, middle-market companies and major corporations, primarily in California, Oregon, Washington, Texas, New York, and Illinois, as well as nationally and internationally.

During the first quarter of 2013, fees based on certain unused commitment balances are classified within credit facility fees. These fees were previously recorded in net interest income and totaled $12 million for the quarter ended March 31, 2012.

Recently Issued Accounting Pronouncements That Are Not Yet Effective

Obligations Resulting from Joint and Several Liability Arrangement for Which the Total Amount of the Obligation Is Fixed at the Reporting Date

In February 2013, the FASB issued ASU 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date, which provides guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. Examples of obligations within the scope of this guidance include debt arrangements, other contractual obligations, and settled litigation and judicial rulings. This guidance is effective for interim and annual periods beginning on January 1, 2014 and must be retroactively applied to prior periods presented. Early adoption is permitted. Management is currently assessing the impact of this guidance to the Company’s financial position and results of operations.

Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity

In March 2013, the FASB issued ASU 2013-05, Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity, which provides guidance on releasing cumulative translation adjustments out of accumulated comprehensive income when a parent deconsolidates or derecognizes a subsidiary or group of assets that is a not for profit activity or a business within a foreign entity or deconsolidates or derecognizes investments in a foreign entity. This guidance is effective prospectively for interim and annual periods beginning on January 1, 2014. Early adoption is permitted. Management does not expect the adoption of this guidance to significantly impact the Company’s financial position or results of operations.

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Business Segments (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Reportable Business Segments

The reportable business segment results for prior periods have been adjusted to reflect changes in the transfer pricing and overhead methodologies that have occurred.

	Retail Banking				Corporate Banking
	As of and for the Three Months Ended March 31,				As of and for the Three Months Ended March 31,
	2013		2012		2013		2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	309	$	268	$	355	$	324
Noninterest income (expense)		60		56		157		145
Total revenue		369		324		512		469
Noninterest expense (income)		300		264		273		236
Credit expense (income)		6		6		38		39
Income (loss) before income taxes and including noncontrolling interests		63		54		201		194
Income tax expense (benefit)		25		22		49		52
Net income (loss) including noncontrolling interest		38		32		152		142
Deduct: Net loss from noncontrolling interests		—		—		—		—
Net income (loss) attributable to UNBC	$	38	$	32	$	152	$	142
Total assets, end of period—Market View (Dollars in millions):	$	30,606	$	25,876	$	39,590	$	35,540

	Other						Reconciling Items
	As of and for the Three Months Ended March 31,						As of and for the Three Months Ended March 31,
	2013			2012			2013			2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	3		$	69		$	(19	)	$	(20	)
Noninterest income (expense)		53			28			(15	)		(15	)
Total revenue		56			97			(34	)		(35	)
Noninterest expense (income)		153			126			(13	)		(12	)
Credit expense (income)		(47	)		(46	)		—			—
Income (loss) before income taxes and including noncontrolling interests		(50	)		17			(21	)		(23	)
Income tax expense (benefit)		(15	)		(14	)		(9	)		(9	)
Net income (loss) including noncontrolling interest		(35	)		31			(12	)		(14	)
Deduct: Net loss from noncontrolling interests		4			4			—			—
Net income (loss) attributable to UNBC	$	(31	)	$	35		$	(12	)	$	(14	)
Total assets, end of period—Market View (Dollars in millions):	$	29,003		$	33,133		$	(2,240	)	$	(2,226	)

	UnionBanCalCorporation
	As of and for the Three Months Ended March 31,
	2013			2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	648		$	641
Noninterest income (expense)		255			214
Total revenue		903			855
Noninterest expense (income)		713			614
Credit expense (income)		(3	)		(1	)
Income (loss) before income taxes and including noncontrolling interests		193			242
Income tax expense (benefit)		50			51
Net income (loss) including noncontrolling interest		143			191
Deduct: Net loss from noncontrolling interests		4			4
Net income (loss) attributable to UNBC	$	147		$	195
Total assets, end of period—Market View (Dollars in millions):	$	96,959		$	92,323

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Commitments, Contingencies and Guarantees - Additional Information (Detail) (Standby and commercial letters of credit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Standby and commercial letters of credit [Member]
Concentration Risk [Line Items]
Term of standby and commercial letters of credit commitments	One year or less
Standby and commercial letters of credit, current	$ 5,930
Period of minimum rate of return on investment term	Twelve-year weighted average period
Investor capital and minimum investment yield	162
Unamortized fair value of guarantee fee	6
Current exposure to loss	31
Future exposure to loss	$ 39

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Securities - Schedule of Held to Maturity Securities Recognized and Not Recognized in Other Comprehensive Income (OCI) and Fair Values (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, Amortized Cost	$ 1,022	$ 1,115
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI)	4	5
Securities held to maturity, Gross Unrealized Losses, Recognized in Other Comprehensive Income (OCI)	11	17
Total securities held to maturity, Carrying Amount	1,015	1,103
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI	21	32
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI
Total securities held to maturity, Fair Value	1,036	1,135
Collateralized loan obligations (CLOs) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, Amortized Cost	75	118
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI)
Securities held to maturity, Gross Unrealized Losses, Recognized in Other Comprehensive Income (OCI)	11	17
Total securities held to maturity, Carrying Amount	64	101
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI	14	20
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI
Total securities held to maturity, Fair Value	78	121
U.S. government agency and government sponsored agencies-residential mortgage backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, Amortized Cost	947	997
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI)	4	5
Securities held to maturity, Gross Unrealized Losses, Recognized in Other Comprehensive Income (OCI)
Total securities held to maturity, Carrying Amount	951	1,002
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI	7	12
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI
Total securities held to maturity, Fair Value	$ 958	$ 1,014

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Loans and Allowance for Loan Losses - FICO Credit Scores and LTV Ratios Related to Loans in Consumer Portfolio Segment and Consumer Loans (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
720 and above percent	76.00%		76.00%
Below 720 percent	22.00%		22.00%
No FICO available percent	2.00%	[1]	2.00%	[1]
Total percent	100.00%		100.00%
Less than 80 percent	82.00%		77.00%
80-100 percent	12.00%		14.00%
Greater than 100 percent	5.00%		8.00%
No LTV available percent	1.00%	[2]	1.00%	[2]
Total percent	100.00%		100.00%
Residential mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
720 and above	17,381		17,103
Below 720	4,630		4,666
No FICO available	445	[1]	395	[1]
Total	22,456		22,164
Less than 80 percent	18,973		17,771
80-100 percent	2,583		3,031
Greater than 100 percent	892		1,232
No LTV available	8	[2]	130	[2]
Total	22,456		22,164
Home equity and other consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
720 and above	2,374		2,464
Below 720	931		986
No FICO available	164	[1]	122	[1]
Total	3,469		3,572
Less than 80 percent	2,286		2,216
80-100 percent	546		618
Greater than 100 percent	438		540
No LTV available	120	[2]	113	[2]
Total	3,390		3,487
Total consumer portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
720 and above	19,755		19,567
Below 720	5,561		5,652
No FICO available	609	[1]	517	[1]
Total	25,925		25,736
Less than 80 percent	21,259		19,987
80-100 percent	3,129		3,649
Greater than 100 percent	1,330		1,772
No LTV available	128	[2]	243	[2]
Total	25,846		25,651
Purchased Credit Impaired [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
720 and above	104		106
Below 720	163		172
No FICO available	15	[1]	10	[1]
Total	282		288
Less than 80 percent	129		72
80-100 percent	45		50
Greater than 100 percent	78		153
No LTV available	30	[2]	13	[2]
Total	282		288
Consumer portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
720 and above	19,859		19,673
Below 720	5,724		5,824
No FICO available	624	[1]	527	[1]
Total	26,207		26,024
Less than 80 percent	21,388		20,059
80-100 percent	3,174		3,699
Greater than 100 percent	1,408		1,925
No LTV available	158	[2]	256	[2]
Total	26,128		25,939

[1] Represents loans for which management was not able to obtain an updated FICO score (e.g., due to recent profile changes).

[2] Represents loans for which management was not able to obtain refreshed property values.

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Fair Value Measurement and Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loans:
Loss Impaired loans	$ (12)	$ (3)
Impaired loans	619		626
Other assets:
Loss on OREO	(3)	(8)
Loss on Private equity investments		(2)
Loss, Total	(15)	(13)
Fair Value Measurements, Nonrecurring [Member]
Loans:
Impaired loans	90	58
Other assets:
OREO	38	71
Private equity investments		27
Total	128	156
Fair Value Measurements, Nonrecurring [Member] | Level 1 [Member]
Loans:
Impaired loans
Other assets:
OREO
Private equity investments
Total
Fair Value Measurements, Nonrecurring [Member] | Level 2 [Member]
Loans:
Impaired loans
Other assets:
OREO
Private equity investments
Total
Fair Value Measurements, Nonrecurring [Member] | Level 3 [Member]
Loans:
Impaired loans	90	58
Other assets:
OREO	38	71
Private equity investments		27
Total	$ 128	$ 156

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Consolidated Statements of Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest Income
Loans	$ 629	$ 594
Securities	118	142
Interest income-other	3	2
Total interest income	750	738
Interest Expense
Deposits	65	58
Long-term debt	36	36
Commercial paper and other short-term borrowings	1	3
Total interest expense	102	97
Net Interest Income	648	641
(Reversal of) provision for loan losses	(3)	(1)
Net interest income after (reversal of) provision for loan losses	651	642
Noninterest Income
Service charges on deposit accounts	53	55
Trust and investment management fees	35	30
Trading account activities	8	31
Securities gains, net	96	19
Credit facility fees	26	25
Merchant banking fees	16	23
Brokerage commissions and fees	12	10
Card processing fees, net	9	8
Other, net		13
Total noninterest income	255	214
Noninterest Expense
Salaries and employee benefits	421	364
Net occupancy and equipment	75	68
Professional and outside services	58	46
Intangible asset amortization	16	21
Regulatory assessments	20	18
(Reversal of) provision for losses on off-balance sheet commitments	15	(2)
Other	108	99
Total noninterest expense	713	614
Income (loss) before income taxes and including noncontrolling interests	193	242
Income tax expense	50	51
Net Income Including Noncontrolling Interests	143	191
Deduct: Net loss from noncontrolling interests	4	4
Net Income Attributable to UnionBanCal Corporation (UNBC)	$ 147	$ 195

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Loans and Allowance for Loan Losses - Summary of Loans (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred fees and costs of loans	$ 26	$ 5
FDIC Loss Share Agreements [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reimbursement of purchased credit impaired loan	376	421
FDIC Covered Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired not accounted as deteriorated credit quality	$ 21	$ 24

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Consolidated Statements of Changes in Stockholder's Equity (USD $) In Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance, beginning at Dec. 31, 2011	$ 11,830	$ 136	$ 5,989	$ 6,246	$ (809)	$ 268
Net income (loss)	191			195		(4)
Other comprehensive income (loss), net of tax	61				61
Compensation expense-restricted stock units	3		3
Other	(3)					(3)
Net change	252		3	195	61	(7)
Balance, ending at Mar. 31, 2012	12,082	136	5,992	6,441	(748)	261
Balance, beginning at Dec. 31, 2012	12,755	136	5,994	6,875	(514)	264
Net income (loss)	143			147		(4)
Other comprehensive income (loss), net of tax	(47)				(47)
Compensation expense-restricted stock units	3		3
Other	10					10
Net change	109		3	147	(47)	6
Balance, ending at Mar. 31, 2013	$ 12,864	$ 136	$ 5,997	$ 7,022	$ (561)	$ 270

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Loans and Allowance for Loan Losses - Average Investment in Impaired Loans and Interest Income Recognized for Impaired Loans (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	$ 623	$ 555
Recognized Interest Income	6	3
Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	241	198
Recognized Interest Income	3	1
Commercial mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	63	124
Recognized Interest Income
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	18	65
Recognized Interest Income		1
Commercial portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	322	387
Recognized Interest Income	3	2
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	275	154
Recognized Interest Income	3	1
Home equity and other consumer loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	21	2
Recognized Interest Income
Consumer portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	296	156
Recognized Interest Income	3	1
Loans excluding purchased credit-impaired loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	618	543
Recognized Interest Income	6	3
Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	5	12
Recognized Interest Income

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Business Combinations - Net Assets Acquired and Estimated Purchase Accounting Adjustments (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Dec. 01, 2012
Business Acquisition [Line Items]
Purchase price	$ 1,516
Business acquisition adjustments to purchase price	234
Net assets acquired	859
Fair value of net assets acquired	1,093
Goodwill	423
Securities available for sale [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	8
Loans held for investment [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	146
Intangible assets [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(1)
Other assets [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	136
Deposits [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(12)
Other short-term borrowings [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(36)
Long-term debt [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(10)
Other Liabilities [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	3
Scenario, Actual [Member]
Business Acquisition [Line Items]
Purchase price	1,516
Business acquisition adjustments to purchase price	244
Net assets acquired	859
Fair value of net assets acquired	1,103
Goodwill	413
Scenario, Actual [Member] | Securities available for sale [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	8
Scenario, Actual [Member] | Loans held for investment [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	141
Scenario, Actual [Member] | Intangible assets [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	18
Scenario, Actual [Member] | Other assets [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	128
Scenario, Actual [Member] | Deposits [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(12)
Scenario, Actual [Member] | Other short-term borrowings [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(36)
Scenario, Actual [Member] | Long-term debt [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(14)
Scenario, Actual [Member] | Other Liabilities [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	11
Scenario, Adjustments [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(10)
Fair value of net assets acquired	(10)
Goodwill	10
Scenario, Adjustments [Member] | Loans held for investment [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	5
Scenario, Adjustments [Member] | Intangible assets [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	(19)
Scenario, Adjustments [Member] | Other assets [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	8
Scenario, Adjustments [Member] | Long-term debt [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	4
Scenario, Adjustments [Member] | Other Liabilities [Member]
Business Acquisition [Line Items]
Business acquisition adjustments to purchase price	$ (8)

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Commercial Paper and Other Short-Term Borrowings - Summary of Commercial Paper and Other Short-Term Borrowings (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Short Term Borrowings [Abstract]
Federal funds purchased and securities sold under repurchase agreements with weighted average interest rates of 0.14% and 0.96% at March 31, 2013 and December 31, 2012, respectively	$ 248	$ 123
Commercial paper, with weighted average interest rates of 0.19% and 0.20% at March 31, 2013 and December 31, 2012, respectively	1,711	1,240
Other borrowed funds:
Term federal funds purchased, with a weighted average interest rate of 0.15% at March 31, 2013	269
Total commercial paper and other short-term borrowings	$ 2,228	$ 1,363

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Securities (Tables)

3 Months Ended

Mar. 31, 2013

Investments Debt And Equity Securities [Abstract]

Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses, and Fair Values of Securities

At March 31, 2013 and December 31, 2012, the amortized cost, gross unrealized gains, gross unrealized losses, and fair values of securities are presented below.

	March 31, 2013
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government sponsored agencies	$	468	$	4	$	—	$	472
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies		13,172		124		15		13,281
Privately issued		358		7		3		362
Commercial mortgage-backed securities		3,500		84		21		3,563
Collateralized loan obligations (CLOs)		2,296		16		10		2,302
Asset-backed and other		99		1		—		100
Asset Liability Management securities		19,893		236		49		20,080
Other debt securities:
Direct bank purchase bonds		1,557		31		56		1,532
Other		154		8		4		158
Equity securities		30		1		—		31
Total securities available for sale	$	21,634	$	276	$	109	$	21,801
	December 31, 2012
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government-sponsored agencies	$	866	$	19	$	—	$	885
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies		13,104		232		3		13,333
Privately issued		445		8		10		443
Commercial mortgage-backed securities		2,863		114		6		2,971
CLOs		1,996		7		44		1,959
Asset-backed and other		145		1		—		146
Asset Liability Management securities		19,419		381		63		19,737
Other debt securities:								—
Direct bank purchase bonds		1,482		27		71		1,438
Other		156		6		4		158
Equity securities		19		—		—		19
Total securities available for sale	$	21,076	$	414	$	138	$	21,352

Securities Available for Sale with Continuous Unrealized Loss

The Company’s securities available for sale with a continuous unrealized loss position at March 31, 2013 and December 31, 2012 are shown below, identified for periods less than 12 months and 12 months or more.

	March 31, 2013
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies	$	3,693	$	15	$	1	$	—	$	3,694	$	15
Privately issued		21		—		139		3		160		3
Commercial mortgage-backed securities		1,637		21		—		—		1,637		21
CLOs		262		2		309		8		571		10
Asset Liability Management securities		5,613		38		449		11		6,062		49
Other debt securities:
Direct bank purchase bonds		1,028		56		—		—		1,028		56
Other		6		1		39		3		45		4
Total securities available for sale	$	6,647	$	95	$	488	$	14	$	7,135	$	109

	December 31, 2012
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies	$	1,152	$	3	$	13	$	—	$	1,165	$	3
Privately issued		32		—		137		10		169		10
Commercial mortgage-backed securities		675		6		—		—		675		6
CLOs		168		1		980		43		1,148		44
Asset-backed and other		32		—		3		—		35		—
Asset Liability Management securities		2,059		10		1,133		53		3,192		63
Other debt securities:
Direct bank purchase bonds		1,019		71		—		—		1,019		71
Other		34		3		13		1		47		4
Total securities available for sale	$	3,112	$	84	$	1,146	$	54	$	4,258	$	138

Fair Value of Debt Securities Available for Sale by Contractual Maturity

The fair value of debt securities available for sale by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.

	March 31, 2013
(Dollars in millions)	One Year or Less		Over One Year Through Five Years		Over Five Years Through Ten Years		Over Ten Years		Total Fair Value
U.S. government sponsored agencies	$	398	$	74	$	—	$	—	$	472
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies		5		45		394		12,837		13,281
Privately issued		—		—		7		355		362
Commercial mortgage-backed securities		—		—		978		2,585		3,563
CLOs		—		559		798		945		2,302
Asset-backed and other		1		90		9		—		100
Asset Liability Management securities		404		768		2,186		16,722		20,080
Other debt securities
Direct bank purchase bonds		74		252		803		403		1,532
Other		—		32		21		105		158
Total debt securities available for sale	$	478	$	1,052	$	3,010	$	17,230	$	21,770

Proceeds from Sales of Securities Available for Sale and Gross Realized Gains and Losses

The proceeds from sales of securities available for sale and gross realized gains and losses are shown below. The specific identification method is used to calculate realized gains and losses on sales.

	For the Three Months Ended March 31,
(Dollars in millions)	2013		2012
Proceeds from sales	$	5,098	$	1,251
Gross realized gains		99		19

Schedule of Held to Maturity Securities Recognized and Not Recognized in Other Comprehensive Income (OCI) and Fair Values

At March 31, 2013 and December 31, 2012, the amortized cost, gross unrealized gains and losses recognized in other comprehensive income (OCI), carrying amount, gross unrealized gains and losses not recognized in OCI, and fair values of securities held to maturity are presented below.

	March 31, 2013
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
CLOs	$	75	$	—	$	11	$	64	$	14	$	—	$	78
U.S. government agency and government sponsored agencies—residential mortgage backed securities		947		4		—		951		7		—		958
Total securities held to maturity	$	1,022	$	4	$	11	$	1,015	$	21	$	—	$	1,036

	December 31, 2012
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
CLOs	$	118	$	—	$	17	$	101	$	20	$	—	$	121
U.S. government agency and government sponsored agencies—residential mortgage backed securities		997		5		—		1,002		12		—		1,014
Total securities held to maturity	$	1,115	$	5	$	17	$	1,103	$	32	$	—	$	1,135

Securities Held to Maturity with Continuous Unrealized Loss Position

The Company’s securities held to maturity with a continuous unrealized loss position at March 31, 2013 and December 31, 2012 are shown below, separately for periods less than 12 months and 12 months or more.

	March 31, 2013
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
CLOs	$	—	$	—	$	—	$	78	$	11	$	—	$	78	$	11	$	—

	December 31, 2012
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
CLOs	$	—	$	—	$	—	$	121	$	17	$	—	$	121	$	17	$	—

Carrying Amount and Fair Value of Securities Held to Maturity by Contractual Maturity

The carrying amount and fair value of securities held to maturity by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.

	March 31, 2013
	Over One Year Through Five Years				Over Ten Years				Total
(Dollars in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
CLOs	$	64	$	78	$	—	$	—	$	64	$	78
U.S. government agency and government sponsored agencies—residential mortgage backed securities		—		—		951		958		951		958
Total securities held to maturity	$	64	$	78	$	951	$	958	$	1,015	$	1,036

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Securities - Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses, and Fair Values of Securities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 21,634	$ 21,076
Gross Unrealized Gains	276	414
Gross Unrealized Losses	109	138
Fair Value	21,801	21,352
U.S. government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	468	866
Gross Unrealized Gains	4	19
Fair Value	472	885
U.S. government agency and government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,172	13,104
Gross Unrealized Gains	124	232
Gross Unrealized Losses	15	3
Fair Value	13,281	13,333
Privately issued [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	358	445
Gross Unrealized Gains	7	8
Gross Unrealized Losses	3	10
Fair Value	362	443
Commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,500	2,863
Gross Unrealized Gains	84	114
Gross Unrealized Losses	21	6
Fair Value	3,563	2,971
Collateralized loan obligations (CLOs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,296	1,996
Gross Unrealized Gains	16	7
Gross Unrealized Losses	10	44
Fair Value	2,302	1,959
Asset-backed and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	99	145
Gross Unrealized Gains	1	1
Fair Value	100	146
Asset Liability Management securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,893	19,419
Gross Unrealized Gains	236	381
Gross Unrealized Losses	49	63
Fair Value	20,080	19,737
Direct bank purchase bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,557	1,482
Gross Unrealized Gains	31	27
Gross Unrealized Losses	56	71
Fair Value	1,532	1,438
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	154	156
Gross Unrealized Gains	8	6
Gross Unrealized Losses	4	4
Fair Value	158	158
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30	19
Gross Unrealized Gains	1
Fair Value	$ 31	$ 19

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Variable Interest Entities (Tables)

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Carrying Amounts Related to Unconsolidated VIEs

The following table presents the Company’s carrying amounts related to the unconsolidated VIEs and location on the consolidated balance sheet at March 31, 2013. The table also presents the Company’s maximum exposure to loss resulting from its involvement with these VIEs. The maximum exposure to loss represents the carrying amount of the Company’s involvement plus any legally binding unfunded commitments in the unlikely event that all of the assets in the VIEs become worthless.

	March 31, 2013
(Dollars in millions)	Total Assets		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	523	$	21	$	886
Renewable energy investments		367		34		367
Private capital investment		17		—		23
Total unconsolidated VIEs	$	907	$	55	$	1,276

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Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail)	Mar. 31, 2013	Dec. 31, 2012
UnionBanCal Corporation [Member] | Fixed rate 3.50% notes due June 2022 [Member] | Senior debt [Member]
Debt Instrument [Line Items]
Debt instrument, Fixed interest rate	3.50%	3.50%
UnionBanCal Corporation [Member] | Fixed rate 5.25% notes due December 2013 [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt instrument, Fixed interest rate	5.25%	5.25%
Subsidiaries [Member] | Federal Home Loan Bank advances [Member] | Senior debt [Member]
Debt Instrument [Line Items]
Debt instrument, weighted-average interest rate	1.33%	1.39%
Subsidiaries [Member] | Floating rate notes due June 2014 [Member] | Senior debt [Member]
Debt Instrument [Line Items]
Interest rate above 3-month LIBOR	0.95%	0.95%
Debt instrument, weighted-average interest rate	1.26%	1.26%
Subsidiaries [Member] | Fixed rate 2.125% notes due December 2013 [Member] | Senior debt [Member]
Debt Instrument [Line Items]
Debt instrument, Fixed interest rate	2.125%	2.125%
Subsidiaries [Member] | Fixed rate 3.00% notes due June 2016 [Member] | Senior debt [Member]
Debt Instrument [Line Items]
Debt instrument, Fixed interest rate	3.00%	3.00%
Subsidiaries [Member] | Fixed rate 2.125% notes due June 2017 [Member] | Senior debt [Member]
Debt Instrument [Line Items]
Debt instrument, Fixed interest rate	2.125%	2.125%
Subsidiaries [Member] | Fixed rate 6.03% notes due July 2014 (related to consolidated VIE) [Member] | Note payable [Member]
Debt Instrument [Line Items]
Debt instrument, Fixed interest rate	6.03%	6.03%
Subsidiaries [Member] | Fixed rate 5.95% notes due May 2016 [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt instrument, Fixed interest rate	5.95%	5.95%
Subsidiaries [Member] | Floating rate [Member] | Junior subordinated debt payable to trusts [Member]
Debt Instrument [Line Items]
Debt instrument, weighted-average interest rate	2.64%	2.66%
Subsidiaries [Member] | Capital Lease Obligations [Member] | Junior subordinated debt payable to trusts [Member]
Debt Instrument [Line Items]
Debt instrument, weighted-average interest rate	4.89%	4.72%

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Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net income including noncontrolling interests	$ 143	$ 191
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Reversal of) provision for loan losses	(3)	(1)
(Reversal of) provision for losses on off-balance sheet commitments	15	(2)
Depreciation, amortization and accretion, net	128	108
Stock-based compensation-restricted stock units	3	3
Deferred income taxes	(18)	(114)
Net gains on sales of securities	(96)	(19)
Net decrease (increase) in trading account assets	89	(43)
Net decrease (increase) in other assets	300	45
Net increase (decrease) in trading account liabilities	(153)	(117)
Net increase (decrease) in other liabilities	(476)	(34)
Loans originated for sale	(34)	(2)
Net proceeds from sale of loans originated for sale	43	1
Other, net	15	(1)
Total adjustments	(187)	(176)
Net cash provided by (used in) operating activities	(44)	15
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	5,098	1,251
Proceeds from matured and called securities available for sale	1,043	1,447
Purchases of securities available for sale	(6,018)	(3,991)
Proceeds from matured securities held to maturity	93	17
Purchases of premises and equipment	(29)	(23)
Proceeds from sales of loans	160	114
Net decrease (increase) in loans	(1,009)	(924)
Proceeds from FDIC loss share agreements	3
Other, net	(7)
Net cash provided by (used in) investing activities	(666)	(2,109)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	(265)	669
Net increase (decrease) in commercial paper and other short-term borrowings	865	2,997
Repayment of long-term debt	(300)	(1,125)
Change in noncontrolling interests	10	(3)
Net cash provided by (used in) financing activities	310	2,538
Net change in cash and cash equivalents	(400)	444
Cash and cash equivalents at beginning of period	5,491	4,195
Cash and cash equivalents at end of period	5,091	4,639
Cash Paid (Received) During the Period For:
Interest	80	92
Income taxes, net	(27)	24
Supplemental Schedule of Noncash Investing and Financing Activities:
Net transfer of loans held for investment to loans held for sale	148	83
Securities available for sale transferred to securities held to maturity		155
Transfer of loans held for investment to other real estate owned assets (OREO)	$ 8	$ 31

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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net Income Attributable to UNBC	$ 147	$ 195
Other Comprehensive Income (Loss), Net of Tax:
Net change in unrealized gains/losses on cash flow hedges		5
Net change in unrealized gains/losses on investment securities	(64)	39
Foreign currency translation adjustment	(1)	1
Net change in pension and other benefits	18	16
Total other comprehensive (loss) income	(47)	61
Comprehensive Income Attributable to UNBC	100	256
Comprehensive loss from noncontrolling interests	(4)	(4)
Total Comprehensive Income	$ 96	$ 252

XML

Derivative Instruments and Other Financial Instruments

3 Months Ended

Mar. 31, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Instruments and Other Financial Instruments

Note 10—Derivative Instruments and Other Financial Instruments

The Company enters into certain derivative and other financial instruments for trading purposes, which includes customer accommodation derivative contracts, and for other-than-trading purposes, which are predominantly used for risk management.

Credit and market risks are inherent in derivative instruments. Credit risk is defined as the possibility that a loss may occur from the failure of another party to perform in accordance with the terms of the contract, which exceeds the value of the existing collateral, if any. The Company utilizes master netting and collateral support annex (CSA) agreements in order to reduce its exposure to credit risk. Additionally, the Company considers the potential loss in the event of counterparty default in estimating the fair value amount of the derivative instrument. Market risk is defined as the risk of loss arising from an adverse change in the market value of financial instruments caused by fluctuations in market prices or rates.

Derivatives are primarily used to manage exposure to interest rate, commodity, foreign currency and credit risk, and to assist customers with their risk management objectives. The Company designates derivative instruments as those used for trading or other-than-trading purposes. All derivative instruments are recognized as assets or liabilities on the consolidated balance sheet at fair value.

The tables below present the notional amounts, and the location and fair value amounts of the Company’s derivative instruments reported on the consolidated balance sheet, segregated between derivative instruments designated and qualifying as hedging instruments and all other derivative instruments as of March 31, 2013 and December 31, 2012. Asset and liability values are presented gross, excluding the impact of legally enforceable master netting and CSA agreements.

	March 31, 2013
			Asset Derivatives			Liability Derivatives
(Dollars in millions)	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Total derivatives designated as hedging instruments:
Interest rate contracts	$	7,350	Other assets	$	24	Other liabilities	$	—
Derivatives not designated as hedging instruments:
Interest rate contracts	$	39,545	Trading account assets	$	966	Trading account liabilities	$	898
Commodity contracts		5,703	Trading account assets		137	Trading account liabilities		116
Foreign exchange contracts		4,249	Trading account assets		54	Trading account liabilities		53
Equity contracts		3,691	Trading account assets		156	Trading account liabilities		157
Other contracts		89	Other assets		1	Other liabilities		4
Total derivatives not designated as hedging instruments	$	53,277		$	1,314		$	1,228
Total derivative instruments	$	60,627		$	1,338		$	1,228
	December 31, 2012
			Asset Derivatives			Liability Derivatives
(Dollars in millions)	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Total derivatives designated as hedging instruments:
Interest rate contracts	$	8,400	Other assets	$	28	Other liabilities	$	—
Derivatives not designated as hedging instruments:
Interest rate contracts	$	37,790	Trading account assets	$	1,075	Trading account liabilities	$	1,009
Commodity contracts		5,595	Trading account assets		167	Trading account liabilities		140
Foreign exchange contracts		4,593	Trading account assets		69	Trading account liabilities		65
Equity contracts		3,631	Trading account assets		103	Trading account liabilities		103
Other contracts		109	Other assets		1	Other liabilities		3
Total derivatives not designated as hedging instruments	$	51,718		$	1,415		$	1,320
Total derivative instruments	$	60,118		$	1,443		$	1,320

Derivatives Used for Other-Than-Trading Purposes

The Company uses interest rate derivatives to manage the financial impact on the Company from changes in market interest rates. These instruments are used to manage interest rate risk relating to specified groups of assets and liabilities, primarily LIBOR-based commercial loans, certificates of deposit (CDs), borrowings, and future debt issuances. Derivatives that qualify for hedge accounting are designated as either fair value or cash flow hedges. In the first quarters of 2013 and 2012, the Company did not have fair value hedges. The significant hedging strategies of the Company are described below.

Cash Flow Hedges

Hedging Strategies for Variable Rate Loans, Borrowings and Certificates of Deposit and Other Time Deposits

The Company engages in several types of cash flow hedging strategies related to forecasted future interest payments, with the hedged risk being the changes in cash flows attributable to changes in the designated benchmark rate (i.e., U.S. dollar LIBOR). In these strategies, the hedging instruments are matched with groups of similar variable rate instruments such that the reset tenor of the variable rate instruments and that of the hedging instrument are identical at inception. Cash flow hedging instruments currently being utilized include purchased caps and interest rate swaps. At March 31, 2013, the weighted average remaining life of the currently active cash flow hedges was approximately 1.1 years.

The Company used purchased interest rate caps with a notional amount of $0.7 billion at March 31, 2013 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed borrowings. Payments received under the cap contract offset the increase in borrowing interest expense if the relevant LIBOR index rises above the cap’s strike rate.

The Company used purchased interest rate caps with a notional amount of $1.4 billion at March 31, 2013 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate component of forecasted issuances of short-term, fixed rate CDs. Net payments to be received under the cap contract offset increases in interest expense if the relevant LIBOR index rises above the cap’s strike rate.

The Company used interest rate swaps with a notional amount of $5.3 billion at March 31, 2013 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed loans. Payments received (or paid) under the swap contract offset fluctuations in interest income on loans caused by changes in the relevant LIBOR index.

Hedging transactions are structured at inception so that the hedging instruments have notional amounts that correspond to an equal amount of principal for loans, CDs, or borrowings. Additionally, the period in which the designated hedged cash flows occur is matched to the term of the hedged instruments. Index and repricing frequencies of the hedging instruments generally match those of the hedged items. As such, most of the ineffectiveness in the hedging relationship results from the mismatch between the timing of reset dates on the hedging instruments versus those of the loans, CDs, or borrowings.

For cash flow hedges, the effective portion of the gain or loss on the hedging instruments is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged cash flows are recognized in net interest income. Gains and losses representing hedge ineffectiveness are recognized in earnings in the period in which they arise. At March 31, 2013, the Company expects to reclassify approximately $23 million of income from accumulated other comprehensive income to net interest income during the twelve months ending March 31, 2014. This amount could differ from amounts actually realized due to changes in interest rates and the addition of other hedges subsequent to March 31, 2013.

The following tables present the amount and location of the net gains and losses recorded in the Company’s consolidated statements of income and changes in stockholder’s equity for derivatives designated as cash flow hedges for the first quarters of 2013 and 2012:

	Amount of Gain or (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)				Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)					Gain or (Loss) Recognized in Income on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	For the Three Months Ended March 31,					For the Three Months Ended March 31,					For the Three Months Ended March 31,
(Dollars in millions)	2013		2012		Location	2013		2012		Location	2013		2012
Derivatives in cash flow hedging relationships
					Interest income	$	7	$	2
Interest rate contracts	$	6	$	10	Interest expense(1)		—		—	Noninterest expense(1)	$	—	$	—
Total	$	6	$	10		$	7	$	2		$	—	$	—

⁽¹⁾  Amount recognized was less than $1 million.

Trading Derivatives

Derivative instruments classified as trading include both derivatives entered into for the Company’s own account and as an accommodation for customers. Trading derivatives are included in trading assets or trading liabilities with changes in fair value reflected in income from trading account activities. The majority of the Company’s derivative transactions for customers were essentially offset by contracts with third parties that reduce or eliminate market risk exposures.

The Company offers market-linked CDs, which allow the client to earn the higher of either a minimum fixed rate of interest or a return tied to either equity, commodity or currency indices. The Company hedges its exposure to the embedded derivative contained in market-linked CDs with a matched over-the-counter option. Both the embedded derivative and hedge options are recorded at fair value with the realized and unrealized changes in fair value recorded in noninterest income within trading account activities.

The following table presents the amount of the net gains and losses reported in the consolidated statement of income under the heading trading account activities for derivative instruments classified as trading for the first quarters of 2013 and 2012:

	Gain or (Loss) Recognized in Income on Derivative Instruments
	For the Three Months Ended
(Dollars in millions)	March 31, 2013			March 31, 2012
Trading derivatives:
Interest rate contracts	$	(1	)	$	14
Equity contracts		3			5
Foreign exchange contracts		3			7
Commodity contracts		(1	)		—
Other contracts		1			—
Total	$	5		$	26

Offsetting Assets and Liabilities

During the first quarter of 2013, the Company adopted ASU 2011-11, Disclosures about Offsetting Assets and Liabilities, which establishes new disclosures about an entity’s rights of setoff and arrangements associated with its financial instruments and derivative instruments. The Company primarily enters into derivative contracts and repurchase agreements with counterparties utilizing a standard International Swaps and Derivatives Association master netting agreement (ISDA MNA) or master repurchase agreements, which generally establish the terms and conditions of the transactions, including a legal right to set-off amounts payable and receivable between the Company and a counterparty, regardless of whether or not such amounts have matured or have contingency features.

The following tables present the offsetting of financial assets and liabilities as of March 31, 2013 and December 31, 2012:

	March 31, 2013
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative Assets	$	1,338	$	392	$	946	$	17	$	5	$	924
Securities purchased under resale agreements		24		—		24		24		—		—
Total	$	1,362	$	392	$	970	$	41	$	5	$	924
Financial Liabilities:
Derivative Liabilities	$	1,228	$	507	$	721	$	467	$	1	$	253
Securities sold under repurchase agreements		40		—		40		40		—		—
Total	$	1,268	$	507	$	761	$	507	$	1	$	253

	December 31, 2012
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative Assets	$	1,443	$	370	$	1,073	$	21	$	2	$	1,050
Securities purchased under resale agreements		19		—		19		19		—		—
Total	$	1,462	$	370	$	1,092	$	40	$	2	$	1,050
Financial Liabilities:
Derivative Liabilities	$	1,320	$	449	$	871	$	491	$	121	$	259
Securities sold under repurchase agreements		5		—		5		5		—		—
Total	$	1,325	$	449	$	876	$	496	$	121	$	259

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Document and Entity Information	3 Months Ended
	Mar. 31, 2013	Apr. 30, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	ub
Entity Registrant Name	UNIONBANCAL CORP
Entity Central Index Key	0001011659
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		136,330,830

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Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Accumulated Other Comprehensive Loss

Note 11—Accumulated Other Comprehensive Loss

The following table presents the change in each of the components of accumulated other comprehensive loss and the related tax effect of the change allocated to each component:

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended March 31, 2012:
Cash flow hedge activities:
Unrealized net gains on hedges arising during the period	$	10		$	(4	)	$	6
Less: Reclassification adjustment for net losses on hedges included in net income		(2	)		1			(1	)
Net change in unrealized losses on hedges		8			(3	)		5
Securities:
Unrealized holding gains arising during the period on securities available for sale		61			(24	)		37
Reclassification adjustment for net gains on securities available for sale included in net income		(19	)		7			(12	)
Less: accretion of fair value adjustment on securities available for sale		(1	)		—			(1	)
Less: accretion of fair value adjustment on held to maturity securities		(6	)		3			(3	)
Less: amortization of net unrealized losses on held to maturity securities		29			(11	)		18
Net change in unrealized losses on securities		64			(25	)		39
Foreign currency translation adjustment		1			—			1
Reclassification adjustment for pension and other benefits included in net income:
Recognized net actuarial loss(1)		26			(10	)		16
Net change in pension and other benefits(1)		26			(10	)		16
Net change in accumulated other comprehensive loss	$	99		$	(38	)	$	61
For the Three Months Ended March 31, 2013:
Cash flow hedge activities:
Unrealized net gains on hedges arising during the period	$	6		$	(2	)	$	4
Less: Reclassification adjustment for net losses on hedges included in interest income for loans and interest expense on long-term debt		(7	)		3			(4	)
Net change in unrealized gains on hedges		(1	)		1			—
Securities:
Reclassification adjustment for net gains on securities available for sale included in securities gains, net		(96	)		38			(58	)
Less: accretion of fair value adjustment on securities available for sale		(15	)		6			(9	)
Less: accretion of fair value adjustment on held to maturity securities		(8	)		3			(5	)
Less: amortization of net unrealized losses on held to maturity securities		14			(6	)		8
Net change in unrealized gains on securities		(105	)		41			(64	)
Foreign currency translation adjustment		(2	)		1			(1	)
Reclassification adjustment for pension and other benefits included in net income:
Recognized net actuarial loss(1)		29			(11	)		18
Net change in pension and other benefits(1)		29			(11	)		18
Net change in accumulated other comprehensive loss	$	(79	)	$	32		$	(47	)

⁽¹⁾  These amounts are included in the computation of net periodic pension cost. For further information, see Note 6 to these consolidated financial statements.

The following table presents the change in accumulated other comprehensive loss balances:

(Dollars in millions)	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Benefits Adjustment			Accumulated Other Comprehensive Loss
Balance, December 31, 2011	$	(17	)	$	(107	)	$	—		$	(685	)	$	(809	)
Other comprehensive income before reclassifications		6			51			1			—			58
Amounts reclassified from accumulated other comprehensive loss		(1	)		(12	)		—			16			3
Balance, March 31, 2012	$	(12	)	$	(68	)	$	1		$	(669	)	$	(748	)
Balance, December 31, 2012	$	24		$	159		$	1		$	(698	)	$	(514	)
Other comprehensive income before reclassifications		4			(6	)		(1	)		—			(3	)
Amounts reclassified from accumulated other comprehensive loss		(4	)		(58	)		—			18			(44	)
Balance, March 31, 2013	$	24		$	95		$	—		$	(680	)	$	(561	)

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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Equity [Abstract]
Unrealized net gains on hedges arising during the period, Before Tax Amount	$ 6	$ 10
Less: Reclassification adjustment for net losses on hedges included in interest income for loans and interest expense on long-term debt, Before Tax Amount	(7)	(2)
Net change in unrealized gains on hedges, Before Tax Amount	(1)	8
Unrealized holding gains arising during the period on securities available for sale, Before Tax Amount		61
Reclassification adjustment for net gains on securities available for sale included in securities gains, net income, Before Tax Amount	(96)	(19)
Less: accretion of fair value adjustment on securities available for sale, Before Tax Amount	(15)	(1)
Less: accretion of fair value adjustment on held to maturity securities, Before Tax Amount	(8)	(6)
Less: amortization of net unrealized losses on held to maturity securities, Before Tax Amount	14	29
Net change in unrealized gains (losses) on securities, Before Tax Amount	(105)	64
Foreign currency translation adjustment, Before Tax Amount	(2)	1
Recognized net actuarial loss, Before Tax Amount	29	26
Net change in pension and other benefits, Before Tax Amount	29	26
Net change in accumulated other comprehensive loss, Before Tax Amount	(79)	99
Unrealized net gains on hedges arising during the period, Tax Effect	(2)	(4)
Less: Reclassification adjustment for net losses on hedges included in interest income for loans and interest expense on long-term debt, Tax Effect	3	1
Net change in unrealized gains on hedges, Tax Effect	1	(3)
Unrealized holding gains arising during the period on securities available for sale, Tax Effect		(24)
Reclassification adjustment for net gains on securities available for sale included in net income, Tax Effect	38	7
Less: accretion of fair value adjustment on securities available for sale, Tax Effect	6
Less: accretion of fair value adjustment on held to maturity securities, Tax Effect	3	3
Less: amortization of net unrealized losses on held to maturity securities, Tax Effect	(6)	(11)
Net change in unrealized gains on securities, Tax Effect	41	(25)
Foreign currency translation adjustment, Tax Effect	1
Recognized net actuarial loss, Tax Effect	(11)	(10)
Net change in pension and other benefits, Tax Effect	(11)	(10)
Net change in accumulated other comprehensive loss, Tax Effect	32	(38)
Unrealized net gains on hedges arising during the period, Net of Tax	4	6
Less: Reclassification adjustment for net losses on hedges included in interest income for loans and interest expense on long-term debt, Net of Tax	(4)	(1)
Net change in unrealized gains on hedges, Net of Tax		5
Unrealized holding gains arising during the period on securities available for sale, Net of Tax		37
Reclassification adjustment for net gains on securities available for sale included in net income, Net of Tax	(58)	(12)
Less: accretion of fair value adjustment on securities available for sale, Net of Tax	(9)	(1)
Less: accretion of fair value adjustment on held to maturity securities, Net of Tax	(5)	(3)
Less: amortization of net unrealized losses on held to maturity securities, Net of Tax	8	18
Net change in unrealized gains on securities, Net of Tax	(64)	39
Foreign currency translation adjustment, Net of Tax	(1)	1
Recognized net actuarial loss, Net of Tax	18	16
Net change in pension and other benefits, Net of Tax	18	16
Net change in accumulated other comprehensive loss, Net of Tax	$ (47)	$ 61

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Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 1,265	$ 1,845
Interest bearing deposits in banks	3,776	3,477
Federal funds sold and securities purchased under resale agreements	50	169
Total cash and cash equivalents	5,091	5,491
Trading account assets (includes $40 at March 31, 2013 and $1 at December 31, 2012 of assets pledged as collateral)	1,119	1,208
Securities available for sale	21,801	21,352
Securities held to maturity (Fair value: March 31, 2013, $1,036; December 31, 2012, $1,135)	1,015	1,103
Loans held for investment	60,882	60,034
Allowance for loan losses	(638)	(653)
Loans held for investment, net	60,244	59,381
Premises and equipment, net	707	710
Intangible assets	339	376
Goodwill	2,952	2,942
FDIC indemnification asset	285	338
Other assets	3,406	4,091
Total assets	96,959	96,992
Deposits:
Noninterest bearing	24,679	25,478
Interest bearing	49,311	48,777
Total deposits	73,990	74,255
Commercial paper and other short-term borrowings	2,228	1,363
Long-term debt	5,314	5,622
Trading account liabilities	742	895
Other liabilities	1,821	2,102
Total liabilities	84,095	84,237
Commitments, contingencies and guarantees-See Note 12
UNBC stockholder's equity:
Preferred stock: Authorized 5,000,000 shares; no shares issued or outstanding
Common stock, par value $1 per share: Authorized 300,000,000 shares, 136,330,830 shares issued and outstanding as of March 31, 2013 and December 31, 2012	136	136
Additional paid-in capital	5,997	5,994
Retained earnings	7,022	6,875
Accumulated other comprehensive loss	(561)	(514)
Total UNBC stockholder's equity	12,594	12,491
Noncontrolling interests	270	264
Total equity	12,864	12,755
Total liabilities and equity	$ 96,959	$ 96,992

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Variable Interest Entities

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Variable Interest Entities

Note 5—Variable Interest Entities

The Company is involved in various activities that are considered to be variable interest entities (VIEs). Generally, a VIE is a corporation, partnership, trust or any other legal structure where the equity investors do not have sufficient equity at risk in the entity to allow the entity to independently finance its activities, lack the power to direct the significant activities of the entity through voting or similar rights, or do not have an obligation to absorb the entity’s losses or the right to receive the entity’s returns. The Company’s investments in VIEs primarily consist of equity investments in low income housing credit (LIHC) structures and renewable energy projects, which are designed to generate returns principally through the realization of federal tax credits and deductions. For further information related to the Company’s consolidated VIEs and those that were not consolidated, see Note 7 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Consolidated VIEs

At March 31, 2013, assets of $293 million and liabilities of $7 million were consolidated by the Company on its consolidated balance sheet related to two LIHC investment fund structures because the Company sponsors, manages and syndicates the funds. The assets are included in other assets as well as interest bearing deposits in banks, the liabilities are primarily included in long-term debt, and third-party investor interests are included in stockholder’s equity as noncontrolling interests. Neither creditors nor equity investors in the LIHC investments have any recourse to the general credit of the Company, and the Company’s creditors do not have any recourse to the assets of the consolidated LIHC investments. At March 31, 2013, the Company also consolidated $99 million of assets related to trusts that own and lease railcars because the Company directs the significant activities of these trusts. The assets are primarily included in other assets on the Company’s consolidated balance sheets.

During both the first quarter of 2013 and the first quarter of 2012, the Company recorded $7 million of expenses related to its consolidated VIEs. These expenses are included in other noninterest expense on the Company’s consolidated statements of income. During the first quarter of 2013, the Company recorded $2 million of revenue related to its consolidated VIEs in other noninterest income.

Unconsolidated VIEs in which the Company has a Variable Interest

The following table presents the Company’s carrying amounts related to the unconsolidated VIEs and location on the consolidated balance sheet at March 31, 2013. The table also presents the Company’s maximum exposure to loss resulting from its involvement with these VIEs. The maximum exposure to loss represents the carrying amount of the Company’s involvement plus any legally binding unfunded commitments in the unlikely event that all of the assets in the VIEs become worthless.

	March 31, 2013
(Dollars in millions)	Total Assets		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	523	$	21	$	886
Renewable energy investments		367		34		367
Private capital investment		17		—		23
Total unconsolidated VIEs	$	907	$	55	$	1,276

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Loans and Allowance for Loan Losses

3 Months Ended

Mar. 31, 2013

Receivables [Abstract]

Loans and Allowance for Loan Losses

Note 4—Loans and Allowance for Loan Losses

The following table provides the outstanding balances of loans at March 31, 2013 and December 31, 2012:

(Dollars in millions)	March 31, 2013			December 31, 2012
Loans held for investment:
Commercial and industrial	$	21,433		$	20,827
Commercial mortgage		9,918			9,939
Construction		659			627
Lease financing		1,060			1,104
Total commercial portfolio		33,070			32,497
Residential mortgage		23,146			22,705
Home equity and other consumer loans		3,542			3,647
Total consumer portfolio		26,688			26,352
Total loans held for investment, before purchased credit-impaired loans		59,758			58,849
Purchased credit-impaired loans(1)		1,124			1,185
Total loans held for investment(2)		60,882			60,034
Allowance for loan losses		(638	)		(653	)
Loans held for investment, net	$	60,244		$	59,381

⁽¹⁾  Includes $376 million and $421 million as of March 31, 2013 and December 31, 2012, respectively, of loans for which the Company will be reimbursed a substantial portion of any future losses under the terms of the FDIC loss share agreements. Of these FDIC covered loans, $21 million and $24 million as of March 31, 2013 and December 31, 2012, respectively, were not accounted for under accounting guidance for loans acquired with deteriorated credit quality.

⁽²⁾  Includes $26 million and $5 million at March 31, 2013 and December 31, 2012, respectively, for net unamortized discounts and premiums and deferred fees and costs.

Allowance for Loan Losses

The following tables provide a reconciliation of changes in the allowance for loan losses by portfolio segment:

	For the Three Months Ended March 31, 2013
(Dollars in millions)	Commercial			Consumer			Purchased Credit- Impaired			Unallocated			Total
Allowance for loan losses, beginning of period	$	418		$	124		$	1		$	110		$	653
(Reversal of) provision for loan losses		68			1			—			(72	)		(3	)
Increase in allowance covered by FDIC indemnification		—			—			2			—			2
Loans charged off		(3	)		(13	)		(3	)		—			(19	)
Recoveries of loans previously charged off		3			1			1			—			5
Allowance for loan losses, end of period	$	486		$	113		$	1		$	38		$	638

	For the Year Ended December 31, 2012
(Dollars in millions)	Commercial			Consumer			Purchased Credit- Impaired			Unallocated			Total
Allowance for loan losses, beginning of period	$	474		$	138		$	17		$	135		$	764
(Reversal of) provision for loan losses		(25	)		78			—			(25	)		28
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification		—			—			(3	)		—			(3	)
Decrease in allowance covered by FDIC indemnification		—			—			(5	)		—			(5	)
Loans charged off		(88	)		(95	)		(13	)		—			(196	)
Recoveries of loans previously charged off		57			3			5			—			65
Allowance for loan losses, end of period	$	418		$	124		$	1		$	110		$	653

The following tables show the allowance for loan losses and related loan balances by portfolio segment as of March 31, 2013 and December 31, 2012:

	March 31, 2013
(Dollars in millions)	Commercial		Consumer		Purchased Credit- Impaired		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	32	$	17	$	—	$	—	$	49
Collectively evaluated for impairment		454		96		—		38		588
Purchased credit-impaired loans		—		—		1		—		1
Total allowance for loan losses	$	486	$	113	$	1	$	38	$	638
Loans held for investment:
Individually evaluated for impairment	$	315	$	300	$	4	$	—	$	619
Collectively evaluated for impairment		32,755		26,388		—		—		59,143
Purchased credit-impaired loans		—		—		1,120		—		1,120
Total loans held for investment	$	33,070	$	26,688	$	1,124	$	—	$	60,882

	December 31, 2012
(Dollars in millions)	Commercial		Consumer		Purchased Credit- Impaired		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	24	$	18	$	—	$	—	$	42
Collectively evaluated for impairment		394		106		—		110		610
Purchased credit-impaired loans		—		—		1		—		1
Total allowance for loan losses	$	418	$	124	$	1	$	110	$	653
Loans held for investment:
Individually evaluated for impairment	$	330	$	292	$	5	$	—	$	627
Collectively evaluated for impairment		32,167		26,060		—		—		58,227
Purchased credit-impaired loans		—		—		1,180		—		1,180
Total loans held for investment	$	32,497	$	26,352	$	1,185	$	—	$	60,034

Nonaccrual and Past Due Loans

The following table presents nonaccrual loans as of March 31, 2013 and December 31, 2012:

(Dollars in millions)	March 31, 2013		December 31, 2012
Commercial and industrial	$	49	$	48
Commercial mortgage		57		65
Total commercial portfolio		106		113
Residential mortgage		326		306
Home equity and other consumer loans		59		56
Total consumer portfolio		385		362
Total nonaccrual loans, before purchased credit-impaired loans		491		475
Purchased credit-impaired loans		29		30
Total nonaccrual loans	$	520	$	505
Troubled debt restructured loans that continue to accrue interest	$	372	$	401
Troubled debt restructured nonaccrual loans (included in the total nonaccrual loans above)	$	223	$	209

The following table shows an aging of the balance of loans held for investment, excluding purchased credit-impaired loans, by class as of March 31, 2013 and December 31, 2012:

	March 31, 2013
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	22,415	$	66	$	12	$	78	$	22,493
Commercial mortgage		9,863		38		17		55		9,918
Construction		657		2		—		2		659
Total commercial portfolio		32,935		106		29		135		33,070
Residential mortgage		22,835		142		169		311		23,146
Home equity and other consumer loans		3,494		27		21		48		3,542
Total consumer portfolio		26,329		169		190		359		26,688
Total loans held for investment, excluding purchased credit-impaired loans	$	59,264	$	275	$	219	$	494	$	59,758

	December 31, 2012
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	21,861	$	68	$	2	$	70	$	21,931
Commercial mortgage		9,869		57		13		70		9,939
Construction		622		5		—		5		627
Total commercial portfolio		32,352		130		15		145		32,497
Residential mortgage		22,351		181		173		354		22,705
Home equity and other consumer loans		3,584		44		19		63		3,647
Total consumer portfolio		25,935		225		192		417		26,352
Total loans held for investment, excluding purchased credit-impaired loans	$	58,287	$	355	$	207	$	562	$	58,849

Loans 90 days or more past due and still accruing totaled $3 million and $1 million at March 31, 2013 and December 31, 2012, respectively. Purchased credit-impaired loans that are 90 days or more past due and still accruing totaled $125 million and $124 million at March 31, 2013 and December 31, 2012, respectively.

Credit Quality Indicators

Management analyzes the Company’s loan portfolios by applying specific monitoring policies and procedures that vary according to the relative risk profile and other characteristics within the various loan portfolios. For further information related to the credit quality indicators the Company uses to monitor the portfolio, see Note 4 to the consolidated financial statements in the Company’s 2012 Form 10-K.

The following tables summarize the loans in the commercial portfolio segment and commercial loans within the purchased credit-impaired loans segment monitored for credit quality based on internal ratings, excluding $327 million and $365 million covered by Federal Deposit Insurance Corporation (FDIC) loss share agreements, at March 31, 2013 and December 31, 2012, respectively. The amounts presented reflect unpaid principal balances less charge-offs. The amounts presented for purchased credit-impaired loans also reflect purchase price adjustments as of acquisition date.

	March 31, 2013
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	21,168	$	770	$	381	$	22,319
Construction		644		16		—		660
Commercial mortgage		9,355		168		210		9,733
Total commercial portfolio		31,167		954		591		32,712
Purchased credit-impaired loans		4		158		304		466
Total	$	31,171	$	1,112	$	895	$	33,178

	December 31, 2012
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	20,961	$	438	$	380	$	21,779
Construction		610		17		—		627
Commercial mortgage		9,298		194		248		9,740
Total commercial portfolio		30,869		649		628		32,146
Purchased credit-impaired loans		21		153		301		475
Total	$	30,890	$	802	$	929	$	32,621

The Company monitors the credit quality of its consumer portfolio segment and consumer loans within the purchased credit-impaired loans segment based primarily on payment status. The following tables summarize the loans in the consumer portfolio segment and purchased credit-impaired loans segment, which excludes $49 million and $57 million of loans covered by FDIC loss share agreements, at March 31, 2013 and December 31, 2012, respectively:

	March 31, 2013
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	22,820	$	326	$	23,146
Home equity and other consumer loans		3,483		59		3,542
Total consumer portfolio		26,303		385		26,688
Purchased credit-impaired loans		282		—		282
Total	$	26,585	$	385	$	26,970

	December 31, 2012
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	22,399	$	306	$	22,705
Home equity and other consumer loans		3,591		56		3,647
Total consumer portfolio		25,990		362		26,352
Purchased credit-impaired loans		288		—		288
Total	$	26,278	$	362	$	26,640

The Company also monitors the credit quality for substantially all of its consumer portfolio segment using credit scores provided by Fair Isaac Corporation (FICO) and refreshed weighted average loan-to-value (LTV) ratios. FICO credit scores are refreshed at least quarterly to monitor the quality of the portfolio. Refreshed LTV measures the principal balance of the loan as a percentage of the estimated current value of the property securing the loan. Home equity loans are evaluated using combined LTV, which measures the principal balance of the combined loans that have liens against the property (including unused amounts for home equity line products) as a percentage of the estimated current value of the property securing the loans. The LTV ratios are refreshed on a quarterly basis, using the most recent home pricing index (HPI) data available for the property location.

The following tables summarize the loans in the consumer portfolio segment and consumer loans within the purchased credit-impaired loans segment monitored for credit quality based on refreshed FICO scores and refreshed LTV ratios at March 31, 2013 and December 31, 2012. These tables exclude loans serviced by third-parties and loans covered by FDIC loss share agreements, as discussed above. The amounts presented reflect unpaid principal balances less partial charge-offs.

	March 31, 2013
	FICO scores
(Dollars in millions)	720 and above			Below 720			No FICO available(1)			Total
Residential mortgage	$	17,381		$	4,630		$	445		$	22,456
Home equity and other consumer loans		2,374			931			164			3,469
Total consumer portfolio		19,755			5,561			609			25,925
Purchased credit-impaired loans		104			163			15			282
Total	$	19,859		$	5,724		$	624		$	26,207
Percentage of total		76	%		22	%		2	%		100	%

	December 31, 2012
	FICO scores
(Dollars in millions)	720 and above			Below 720			No FICO available(1)			Total
Residential mortgage	$	17,103		$	4,666		$	395		$	22,164
Home equity and other consumer loans		2,464			986			122			3,572
Total consumer portfolio		19,567			5,652			517			25,736
Purchased credit-impaired loans		106			172			10			288
Total	$	19,673		$	5,824		$	527		$	26,024
Percentage of total		76	%		22	%		2	%		100	%

⁽¹⁾  Represents loans for which management was not able to obtain an updated FICO score (e.g., due to recent profile changes).

	March 31, 2013
	LTV ratios
(Dollars in millions)	Less than 80 percent			80-100 percent			Greater than 100 percent			No LTV available(1)			Total
Residential mortgage	$	18,973		$	2,583		$	892		$	8		$	22,456
Home equity loans		2,286			546			438			120			3,390
Total consumer portfolio		21,259			3,129			1,330			128			25,846
Purchased credit-impaired loans		129			45			78			30			282
Total	$	21,388		$	3,174		$	1,408		$	158		$	26,128
Percentage of total		82	%		12	%		5	%		1	%		100	%
	December 31, 2012
	LTV ratios
(Dollars in millions)	Less than 80 percent			80-100 percent			Greater than 100 percent			No LTV available(1)			Total
Residential mortgage	$	17,771		$	3,031		$	1,232		$	130		$	22,164
Home equity loans		2,216			618			540			113			3,487
Total consumer portfolio		19,987			3,649			1,772			243			25,651
Purchased credit-impaired loans		72			50			153			13			288
Total	$	20,059		$	3,699		$	1,925		$	256		$	25,939
Percentage of total		77	%		14	%		8	%		1	%		100	%

⁽¹⁾ Represents loans for which management was not able to obtain refreshed property values.

Troubled Debt Restructurings

The following table provides a summary of the Company’s recorded investment in troubled debt restructurings (TDRs) as of March 31, 2013 and December 31, 2012. The summary includes those TDRs that are on nonaccrual status and those that continue to accrue interest. The Company had $45 million in commitments to lend additional funds to borrowers with loan modifications classified as TDRs as of March 31, 2013.

(Dollars in millions)	March 31, 2013		December 31, 2012
Commercial and industrial	$	251	$	215
Commercial mortgage		38		64
Construction		2		35
Total commercial portfolio		291		314
Residential mortgage		279		271
Home equity and other consumer loans		21		21
Total consumer portfolio		300		292
Total excluding purchased credit-impaired loans(1)	$	591	$	606

⁽¹⁾  Amounts exclude $4 million of TDRs covered by FDIC loss share agreements at both March 31, 2013 and December 31, 2012, respectively.

For the first quarter of 2013, TDR modifications in the commercial portfolio segment were primarily composed of interest rate changes, maturity extensions, principal paydowns, covenant waivers and payment deferrals, or some combination thereof. In the consumer portfolio segment, primarily all of the modifications were composed of interest rate reductions and maturity extensions. There were charge-offs of $1 million related to TDR modifications in the first quarter of 2013. For the commercial and consumer portfolio segments, the allowance for loan losses for TDRs is measured on an individual loan basis or in pools with similar risk characteristics.

The following tables provide the pre- and post-modification outstanding recorded investment amounts of TDRs as of the date of the restructuring that occurred during the first quarter of 2013:

	For the Three Months Ended March 31, 2013
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	76	$	74
Commercial mortgage		11		11
Total commercial portfolio		87		85
Residential mortgage		25		24
Home equity and other consumer loans		1		1
Total consumer portfolio		26		25
Total	$	113	$	110

⁽¹⁾  Represents the recorded investment in the loan immediately prior to the restructuring event.

⁽²⁾  Represents the recorded investment in the loan immediately following the restructuring event. It includes the effect of paydowns that were required as part of the restructuring terms.

The following table provides the recorded investment amounts of TDRs at the date of default, for which there was a payment default during the first quarter of 2013, and where the default occurred within the first twelve months after modification into a TDR. A payment default is defined as the loan being 60 days or more past due.

(Dollars in millions)	For the Three Months Ended March 31, 2013
Commercial and industrial	$	5
Residential mortgage		2
Total	$	7

For the consumer portfolio, historical payment defaults and the propensity to redefault are some of the factors considered when determining the allowance for loan losses for situations where impairment is measured using the present value of expected future cash flows discounted at the loan’s effective interest rate.

Loan Impairment

Loans that are individually evaluated for impairment include larger commercial and industrial, construction, commercial mortgage loans, and loans modified in a TDR. When the value of an impaired loan is less than the recorded investment in the loan, the Company records an impairment allowance.

The following tables show information about impaired loans by class as of March 31, 2013 and December 31, 2012:

	March 31, 2013
	Recorded Investment						Allowance for Impaired Loans		Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total				With an Allowance		Without an Allowance
Commercial and industrial	$	199	$	64	$	263	$	30	$	209	$	65
Commercial mortgage		25		25		50		2		28		34
Construction		2		—		2		—		3		—
Total commercial portfolio		226		89		315		32		240		99
Residential mortgage		169		110		279		16		182		124
Home equity and other consumer loans		3		18		21		1		4		31
Total consumer portfolio		172		128		300		17		186		155
Total, excluding purchased credit-impaired loans		398		217		615		49		426		254
Purchased credit-impaired loans		1		3		4		—		1		11
Total	$	399	$	220	$	619	$	49	$	427	$	265
	December 31, 2012
	Recorded Investment						Allowance for Impaired Loans		Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total				With an Allowance		Without an Allowance
Commercial and industrial	$	156	$	64	$	220	$	24	$	167	$	64
Commercial mortgage		15		60		75		—		18		70
Construction		—		35		35		—		—		38
Total commercial portfolio		171		159		330		24		185		172
Residential mortgage		186		85		271		18		199		97
Home equity and other consumer loans		3		18		21		—		3		31
Total consumer portfolio		189		103		292		18		202		128
Total, excluding purchased credit-impaired loans		360		262		622		42		387		300
Purchased credit-impaired loans		—		4		4		—		1		14
Total	$	360	$	266	$	626	$	42	$	388	$	314

The following tables present the average recorded investment in impaired loans and the amount of interest income recognized for impaired loans during the first quarters of 2013 and 2012 for the commercial, consumer and purchased credit-impaired loans portfolio segments.

	For the Three Months Ended March 31,
	2013				2012
(Dollars in millions)	Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income
Commercial and industrial	$	241	$	3	$	198	$	1
Commercial mortgage		63		—		124		—
Construction		18		—		65		1
Total commercial portfolio		322		3		387		2
Residential mortgage		275		3		154		1
Home equity and other consumer loans		21		—		2		—
Total consumer portfolio		296		3		156		1
Total, excluding purchased credit-impaired loans		618		6		543		3
Purchased credit-impaired loans		5		—		12		—
Total	$	623	$	6	$	555	$	3

The Company transferred a net $148 million of loans from held for investment to held for sale and sold $160 million in loans during the first quarter of 2013.

Loans Acquired in Business Combinations

The Company accounts for certain loans acquired in business combinations in accordance with accounting guidance related to loans acquired with deteriorated credit quality (purchased credit-impaired loans). The following table presents the outstanding balances and carrying amounts of the Company’s purchased credit-impaired loans as of March 31, 2013 and December 31, 2012.

	March 31,		December 31,
(Dollars in millions)	2013		2012
Total outstanding balance	$	1,956	$	2,155
Carrying amount	$	1,103	$	1,161

The accretable yield for purchased credit-impaired loans for the first quarters of 2013 and 2012 was as follows:

	For the Three Months Ended March 31,
(Dollars in millions)	2013			2012
Accretable yield, beginning of period	$	590		$	424
Additions		—			—
Accretion		(79	)		(63	)
Reclassifications from nonaccretable difference during the period		(10	)		80
Accretable yield, end of period	$	501		$	441

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Loans and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2013

Receivables [Abstract]

Summary of Loans

The following table provides the outstanding balances of loans at March 31, 2013 and December 31, 2012:

(Dollars in millions)	March 31, 2013			December 31, 2012
Loans held for investment:
Commercial and industrial	$	21,433		$	20,827
Commercial mortgage		9,918			9,939
Construction		659			627
Lease financing		1,060			1,104
Total commercial portfolio		33,070			32,497
Residential mortgage		23,146			22,705
Home equity and other consumer loans		3,542			3,647
Total consumer portfolio		26,688			26,352
Total loans held for investment, before purchased credit-impaired loans		59,758			58,849
Purchased credit-impaired loans(1)		1,124			1,185
Total loans held for investment(2)		60,882			60,034
Allowance for loan losses		(638	)		(653	)
Loans held for investment, net	$	60,244		$	59,381

⁽¹⁾  Includes $376 million and $421 million as of March 31, 2013 and December 31, 2012, respectively, of loans for which the Company will be reimbursed a substantial portion of any future losses under the terms of the FDIC loss share agreements. Of these FDIC covered loans, $21 million and $24 million as of March 31, 2013 and December 31, 2012, respectively, were not accounted for under accounting guidance for loans acquired with deteriorated credit quality.

⁽²⁾  Includes $26 million and $5 million at March 31, 2013 and December 31, 2012, respectively, for net unamortized discounts and premiums and deferred fees and costs.

Reconciliation of Changes in Allowance for Loan Losses by Portfolio Segment

The following tables provide a reconciliation of changes in the allowance for loan losses by portfolio segment:

	For the Three Months Ended March 31, 2013
(Dollars in millions)	Commercial			Consumer			Purchased Credit- Impaired			Unallocated			Total
Allowance for loan losses, beginning of period	$	418		$	124		$	1		$	110		$	653
(Reversal of) provision for loan losses		68			1			—			(72	)		(3	)
Increase in allowance covered by FDIC indemnification		—			—			2			—			2
Loans charged off		(3	)		(13	)		(3	)		—			(19	)
Recoveries of loans previously charged off		3			1			1			—			5
Allowance for loan losses, end of period	$	486		$	113		$	1		$	38		$	638

	For the Year Ended December 31, 2012
(Dollars in millions)	Commercial			Consumer			Purchased Credit- Impaired			Unallocated			Total
Allowance for loan losses, beginning of period	$	474		$	138		$	17		$	135		$	764
(Reversal of) provision for loan losses		(25	)		78			—			(25	)		28
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification		—			—			(3	)		—			(3	)
Decrease in allowance covered by FDIC indemnification		—			—			(5	)		—			(5	)
Loans charged off		(88	)		(95	)		(13	)		—			(196	)
Recoveries of loans previously charged off		57			3			5			—			65
Allowance for loan losses, end of period	$	418		$	124		$	1		$	110		$	653

Allowance for Loan Losses and Related Loan Balances by Portfolio Segment

The following tables show the allowance for loan losses and related loan balances by portfolio segment as of March 31, 2013 and December 31, 2012:

	March 31, 2013
(Dollars in millions)	Commercial		Consumer		Purchased Credit- Impaired		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	32	$	17	$	—	$	—	$	49
Collectively evaluated for impairment		454		96		—		38		588
Purchased credit-impaired loans		—		—		1		—		1
Total allowance for loan losses	$	486	$	113	$	1	$	38	$	638
Loans held for investment:
Individually evaluated for impairment	$	315	$	300	$	4	$	—	$	619
Collectively evaluated for impairment		32,755		26,388		—		—		59,143
Purchased credit-impaired loans		—		—		1,120		—		1,120
Total loans held for investment	$	33,070	$	26,688	$	1,124	$	—	$	60,882

	December 31, 2012
(Dollars in millions)	Commercial		Consumer		Purchased Credit- Impaired		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	24	$	18	$	—	$	—	$	42
Collectively evaluated for impairment		394		106		—		110		610
Purchased credit-impaired loans		—		—		1		—		1
Total allowance for loan losses	$	418	$	124	$	1	$	110	$	653
Loans held for investment:
Individually evaluated for impairment	$	330	$	292	$	5	$	—	$	627
Collectively evaluated for impairment		32,167		26,060		—		—		58,227
Purchased credit-impaired loans		—		—		1,180		—		1,180
Total loans held for investment	$	32,497	$	26,352	$	1,185	$	—	$	60,034

Summary of Nonaccrual Loans

The following table presents nonaccrual loans as of March 31, 2013 and December 31, 2012:

(Dollars in millions)	March 31, 2013		December 31, 2012
Commercial and industrial	$	49	$	48
Commercial mortgage		57		65
Total commercial portfolio		106		113
Residential mortgage		326		306
Home equity and other consumer loans		59		56
Total consumer portfolio		385		362
Total nonaccrual loans, before purchased credit-impaired loans		491		475
Purchased credit-impaired loans		29		30
Total nonaccrual loans	$	520	$	505
Troubled debt restructured loans that continue to accrue interest	$	372	$	401
Troubled debt restructured nonaccrual loans (included in the total nonaccrual loans above)	$	223	$	209

Aging of Balance of Loans Held for Investment, Excluding Purchased Credit-Impaired Loans

The following table shows an aging of the balance of loans held for investment, excluding purchased credit-impaired loans, by class as of March 31, 2013 and December 31, 2012:

	March 31, 2013
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	22,415	$	66	$	12	$	78	$	22,493
Commercial mortgage		9,863		38		17		55		9,918
Construction		657		2		—		2		659
Total commercial portfolio		32,935		106		29		135		33,070
Residential mortgage		22,835		142		169		311		23,146
Home equity and other consumer loans		3,494		27		21		48		3,542
Total consumer portfolio		26,329		169		190		359		26,688
Total loans held for investment, excluding purchased credit-impaired loans	$	59,264	$	275	$	219	$	494	$	59,758

	December 31, 2012
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	21,861	$	68	$	2	$	70	$	21,931
Commercial mortgage		9,869		57		13		70		9,939
Construction		622		5		—		5		627
Total commercial portfolio		32,352		130		15		145		32,497
Residential mortgage		22,351		181		173		354		22,705
Home equity and other consumer loans		3,584		44		19		63		3,647
Total consumer portfolio		25,935		225		192		417		26,352
Total loans held for investment, excluding purchased credit-impaired loans	$	58,287	$	355	$	207	$	562	$	58,849

Loans in Commercial Portfolio Segment and Commercial Loans within Purchased Credit-Impaired Loans Segment Monitored for Credit Quality

The following tables summarize the loans in the commercial portfolio segment and commercial loans within the purchased credit-impaired loans segment monitored for credit quality based on internal ratings, excluding $327 million and $365 million covered by Federal Deposit Insurance Corporation (FDIC) loss share agreements, at March 31, 2013 and December 31, 2012, respectively. The amounts presented reflect unpaid principal balances less charge-offs. The amounts presented for purchased credit-impaired loans also reflect purchase price adjustments as of acquisition date.

	March 31, 2013
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	21,168	$	770	$	381	$	22,319
Construction		644		16		—		660
Commercial mortgage		9,355		168		210		9,733
Total commercial portfolio		31,167		954		591		32,712
Purchased credit-impaired loans		4		158		304		466
Total	$	31,171	$	1,112	$	895	$	33,178

	December 31, 2012
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	20,961	$	438	$	380	$	21,779
Construction		610		17		—		627
Commercial mortgage		9,298		194		248		9,740
Total commercial portfolio		30,869		649		628		32,146
Purchased credit-impaired loans		21		153		301		475
Total	$	30,890	$	802	$	929	$	32,621

Loans in Consumer Portfolio Segment Monitored for Credit Quality

The following tables summarize the loans in the consumer portfolio segment and purchased credit-impaired loans segment, which excludes $49 million and $57 million of loans covered by FDIC loss share agreements, at March 31, 2013 and December 31, 2012, respectively:

	March 31, 2013
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	22,820	$	326	$	23,146
Home equity and other consumer loans		3,483		59		3,542
Total consumer portfolio		26,303		385		26,688
Purchased credit-impaired loans		282		—		282
Total	$	26,585	$	385	$	26,970

	December 31, 2012
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	22,399	$	306	$	22,705
Home equity and other consumer loans		3,591		56		3,647
Total consumer portfolio		25,990		362		26,352
Purchased credit-impaired loans		288		—		288
Total	$	26,278	$	362	$	26,640

FICO Credit Scores and LTV Ratios Related to Loans in Consumer Portfolio Segment and Consumer Loans

The following tables summarize the loans in the consumer portfolio segment and consumer loans within the purchased credit-impaired loans segment monitored for credit quality based on refreshed FICO scores and refreshed LTV ratios at March 31, 2013 and December 31, 2012. These tables exclude loans serviced by third-parties and loans covered by FDIC loss share agreements, as discussed above. The amounts presented reflect unpaid principal balances less partial charge-offs.

	March 31, 2013
	FICO scores
(Dollars in millions)	720 and above			Below 720			No FICO available(1)			Total
Residential mortgage	$	17,381		$	4,630		$	445		$	22,456
Home equity and other consumer loans		2,374			931			164			3,469
Total consumer portfolio		19,755			5,561			609			25,925
Purchased credit-impaired loans		104			163			15			282
Total	$	19,859		$	5,724		$	624		$	26,207
Percentage of total		76	%		22	%		2	%		100	%

	December 31, 2012
	FICO scores
(Dollars in millions)	720 and above			Below 720			No FICO available(1)			Total
Residential mortgage	$	17,103		$	4,666		$	395		$	22,164
Home equity and other consumer loans		2,464			986			122			3,572
Total consumer portfolio		19,567			5,652			517			25,736
Purchased credit-impaired loans		106			172			10			288
Total	$	19,673		$	5,824		$	527		$	26,024
Percentage of total		76	%		22	%		2	%		100	%

⁽¹⁾  Represents loans for which management was not able to obtain an updated FICO score (e.g., due to recent profile changes).

	March 31, 2013
	LTV ratios
(Dollars in millions)	Less than 80 percent			80-100 percent			Greater than 100 percent			No LTV available(1)			Total
Residential mortgage	$	18,973		$	2,583		$	892		$	8		$	22,456
Home equity loans		2,286			546			438			120			3,390
Total consumer portfolio		21,259			3,129			1,330			128			25,846
Purchased credit-impaired loans		129			45			78			30			282
Total	$	21,388		$	3,174		$	1,408		$	158		$	26,128
Percentage of total		82	%		12	%		5	%		1	%		100	%
	December 31, 2012
	LTV ratios
(Dollars in millions)	Less than 80 percent			80-100 percent			Greater than 100 percent			No LTV available(1)			Total
Residential mortgage	$	17,771		$	3,031		$	1,232		$	130		$	22,164
Home equity loans		2,216			618			540			113			3,487
Total consumer portfolio		19,987			3,649			1,772			243			25,651
Purchased credit-impaired loans		72			50			153			13			288
Total	$	20,059		$	3,699		$	1,925		$	256		$	25,939
Percentage of total		77	%		14	%		8	%		1	%		100	%

⁽¹⁾ Represents loans for which management was not able to obtain refreshed property values.

Summary of Troubled Debt Restructurings

The following table provides a summary of the Company’s recorded investment in troubled debt restructurings (TDRs) as of March 31, 2013 and December 31, 2012. The summary includes those TDRs that are on nonaccrual status and those that continue to accrue interest. The Company had $45 million in commitments to lend additional funds to borrowers with loan modifications classified as TDRs as of March 31, 2013.

(Dollars in millions)	March 31, 2013		December 31, 2012
Commercial and industrial	$	251	$	215
Commercial mortgage		38		64
Construction		2		35
Total commercial portfolio		291		314
Residential mortgage		279		271
Home equity and other consumer loans		21		21
Total consumer portfolio		300		292
Total excluding purchased credit-impaired loans(1)	$	591	$	606

⁽¹⁾  Amounts exclude $4 million of TDRs covered by FDIC loss share agreements at both March 31, 2013 and December 31, 2012, respectively.

Pre- and Post-Modification Outstanding Recorded Investment Amounts of Troubled Debt Restructurings

The following tables provide the pre- and post-modification outstanding recorded investment amounts of TDRs as of the date of the restructuring that occurred during the first quarter of 2013:

	For the Three Months Ended March 31, 2013
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	76	$	74
Commercial mortgage		11		11
Total commercial portfolio		87		85
Residential mortgage		25		24
Home equity and other consumer loans		1		1
Total consumer portfolio		26		25
Total	$	113	$	110

⁽¹⁾  Represents the recorded investment in the loan immediately prior to the restructuring event.

⁽²⁾  Represents the recorded investment in the loan immediately following the restructuring event. It includes the effect of paydowns that were required as part of the restructuring terms.

Recorded Investment Amounts of Troubled Debt Restructurings

The following table provides the recorded investment amounts of TDRs at the date of default, for which there was a payment default during the first quarter of 2013, and where the default occurred within the first twelve months after modification into a TDR. A payment default is defined as the loan being 60 days or more past due.

(Dollars in millions)	For the Three Months Ended March 31, 2013
Commercial and industrial	$	5
Residential mortgage		2
Total	$	7

Information about Impaired Loans by Class

The following tables show information about impaired loans by class as of March 31, 2013 and December 31, 2012:

	March 31, 2013
	Recorded Investment						Allowance for Impaired Loans		Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total				With an Allowance		Without an Allowance
Commercial and industrial	$	199	$	64	$	263	$	30	$	209	$	65
Commercial mortgage		25		25		50		2		28		34
Construction		2		—		2		—		3		—
Total commercial portfolio		226		89		315		32		240		99
Residential mortgage		169		110		279		16		182		124
Home equity and other consumer loans		3		18		21		1		4		31
Total consumer portfolio		172		128		300		17		186		155
Total, excluding purchased credit-impaired loans		398		217		615		49		426		254
Purchased credit-impaired loans		1		3		4		—		1		11
Total	$	399	$	220	$	619	$	49	$	427	$	265
	December 31, 2012
	Recorded Investment						Allowance for Impaired Loans		Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total				With an Allowance		Without an Allowance
Commercial and industrial	$	156	$	64	$	220	$	24	$	167	$	64
Commercial mortgage		15		60		75		—		18		70
Construction		—		35		35		—		—		38
Total commercial portfolio		171		159		330		24		185		172
Residential mortgage		186		85		271		18		199		97
Home equity and other consumer loans		3		18		21		—		3		31
Total consumer portfolio		189		103		292		18		202		128
Total, excluding purchased credit-impaired loans		360		262		622		42		387		300
Purchased credit-impaired loans		—		4		4		—		1		14
Total	$	360	$	266	$	626	$	42	$	388	$	314

Average Investment in Impaired Loans and Interest Income Recognized for Impaired Loans

The following tables present the average recorded investment in impaired loans and the amount of interest income recognized for impaired loans during the first quarters of 2013 and 2012 for the commercial, consumer and purchased credit-impaired loans portfolio segments.

	For the Three Months Ended March 31,
	2013				2012
(Dollars in millions)	Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income
Commercial and industrial	$	241	$	3	$	198	$	1
Commercial mortgage		63		—		124		—
Construction		18		—		65		1
Total commercial portfolio		322		3		387		2
Residential mortgage		275		3		154		1
Home equity and other consumer loans		21		—		2		—
Total consumer portfolio		296		3		156		1
Total, excluding purchased credit-impaired loans		618		6		543		3
Purchased credit-impaired loans		5		—		12		—
Total	$	623	$	6	$	555	$	3

Outstanding Balances and Carrying Amounts of Purchased Credit-Impaired Loans

The following table presents the outstanding balances and carrying amounts of the Company’s purchased credit-impaired loans as of March 31, 2013 and December 31, 2012.

	March 31,		December 31,
(Dollars in millions)	2013		2012
Total outstanding balance	$	1,956	$	2,155
Carrying amount	$	1,103	$	1,161

Changes in Accretable Balance for Purchased Credit-Impaired Loans

The accretable yield for purchased credit-impaired loans for the first quarters of 2013 and 2012 was as follows:

	For the Three Months Ended March 31,
(Dollars in millions)	2013			2012
Accretable yield, beginning of period	$	590		$	424
Additions		—			—
Accretion		(79	)		(63	)
Reclassifications from nonaccretable difference during the period		(10	)		80
Accretable yield, end of period	$	501		$	441

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Commitments, Contingencies and Guarantees

3 Months Ended

Mar. 31, 2013

Commitments And Contingencies Disclosure [Abstract]

Commitments, Contingencies and Guarantees

Note 12—Commitments, Contingencies and Guarantees

The following table summarizes the Company’s commitments:

(Dollars in millions)	March 31, 2013
Commitments to extend credit	$	28,999
Standby and commercial letters of credit		5,930
Other commitments		712

Commitments to extend credit are legally binding agreements to lend to a customer provided there are no violations of any condition established in the contract. Commitments have fixed expiration dates or other termination clauses and may require maintenance of compensatory balances. Since many of the commitments to extend credit may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements.

Standby and commercial letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party, while commercial letters of credit are issued specifically to facilitate foreign or domestic trade transactions. Additionally, the Company enters into risk participations in bankers’ acceptances wherein a fee is received to guarantee a portion of the credit risk on an acceptance of another bank. The majority of these types of commitments have terms of one year or less. At March 31, 2013, the carrying amount of the Company’s risk participations in bankers’ acceptances and standby and commercial letters of credit totaled $4 million. Estimated exposure to loss related to these commitments is covered by the allowance for losses on off-balance sheet commitments. The carrying amounts of the standby and commercial letters of credit and the allowance for losses on off-balance sheet commitments are included in other liabilities on the consolidated balance sheet.

The credit risk involved in issuing loan commitments and standby and commercial letters of credit is essentially the same as that involved in extending loans to customers and is represented by the contractual amount of these instruments. Collateral may be obtained based on management’s credit assessment of the customer.

Other commitments include commitments to fund principal investments, LIHC investments and other securities.

Principal investments include direct investments in private and public companies. The Company issues commitments to provide equity and mezzanine capital financing to private and public companies through direct investments. The timing of future cash requirements to fund such commitments is generally dependent on the investment cycle. This cycle, the period over which privately held companies are funded by private equity investors and ultimately sold, merged, or taken public through an initial offering, can vary based on overall market conditions as well as the nature and type of industry in which the companies operate.

The Company invests in either guaranteed or unguaranteed LIHC investments. The guaranteed LIHC investments carry a minimum rate of return guarantee by a creditworthy entity. The unguaranteed LIHC investments carry partial guarantees covering the timely completion of projects, availability of tax credits and operating deficit thresholds from the issuer. For these LIHC investments, the Company has committed to provide additional funding as stipulated by its investment participation.

The Company is a fund manager for limited liability companies issuing LIHC investments. LIHC investments provide tax benefits to investors in the form of tax deductions from operating losses and tax credits. To facilitate the sale of these LIHC investments, the Company guarantees a minimum rate of return throughout the investment term of over a twelve-year weighted average period. Additionally, the Company receives guarantees, which include the timely completion of projects, availability of tax credits and operating deficit thresholds, from the limited liability partnerships and corporations issuing the LIHC investments that reduce the Company’s ultimate exposure to loss. As of March 31, 2013, the Company’s maximum exposure to loss under these guarantees was limited to a return of investor capital and minimum investment yield, or $162 million. The risk that the Company would be required to pay investors for a yield deficiency is low, based on the continued satisfactory performance of the underlying properties. At March 31, 2013, the Company had $6 million recorded related to these guarantees, which represents the remaining unamortized carrying amount of the guarantee fees that were recognized at inception. For information on the Company’s LIHC investments that were consolidated, refer to Note 5 to the consolidated financial statements in this Form 10-Q.

The Company occasionally enters into financial guarantee contracts where a premium is received from another financial institution counterparty to guarantee a portion of the credit risk on interest rate swap contracts entered into between the financial institution and its customer. The Company becomes liable to pay the financial institution only if the financial institution is unable to collect amounts owed to them by their customer. As of March 31, 2013, the current exposure to loss under these contracts totaled $31 million, and the maximum potential exposure to loss in the future was estimated at $39 million.

The Company is subject to various pending and threatened legal actions that arise in the normal course of business. The Company maintains liabilities for losses from legal actions that are recorded when they are determined to be both probable in their occurrence and can be reasonably estimated. In addition, management believes the disposition of all claims currently pending, including potential losses from claims that may exceed the liabilities recorded, and claims for loss contingencies that are considered reasonably possible to occur, will not have a material effect, either individually or in the aggregate, on the Company’s consolidated financial condition, operating results or liquidity.

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Business Segments - Additional Information (Detail) (Retail Banking [Member])	3 Months Ended
	Mar. 31, 2013 Segment
Segment Reporting Information [Line Items]
Operating segments	3
Corporate Banking [Member]
Segment Reporting Information [Line Items]
Reportable business segments	2

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Long-Term Debt

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Long-Term Debt

Note 8—Long-Term Debt

The following is a summary of the Company’s long-term debt:

(Dollars in millions)	March 31, 2013		December 31, 2012
Debt issued by UnionBanCal Corporation
Senior debt:
Fixed rate 3.50% notes due June 2022	$	397	$	397
Subordinated debt:
Fixed rate 5.25% notes due December 2013		404		406
Total debt issued by UnionBanCal Corporation		801		803
Debt issued by Union Bank, N.A. and other subsidiaries
Senior debt:
Fixed and floating rate Federal Home Loan Bank advances with maturities ranging from September 2013 to February 2016. These notes bear a combined weighted-average rate of 1.33% at March 31, 2013 and 1.39% at December 31, 2012		1,800		2,100
Floating rate notes due June 2014. These notes, which bear interest at 0.95% above 3-month LIBOR, had a rate of 1.26% at both March 31, 2013 and December 31, 2012		300		300
Fixed rate 2.125% notes due December 2013		400		399
Fixed rate 3.00% notes due June 2016		699		699
Fixed rate 2.125% notes due June 2017		499		499
Note payable:
Fixed rate 6.03% notes due July 2014 (related to consolidated VIE)		6		6
Subordinated debt:
Fixed rate 5.95% notes due May 2016		726		729
Junior subordinated debt payable to trusts(1):
Floating rate notes with maturities ranging from March 2033 to September 2036. These notes bear a combined weighted-average rate of 2.64% at March 31, 2013 and 2.66% at December 31, 2012		66		66
Capital lease obligations with a combined weighted average interest rate of 4.89% at March 31, 2013 and 4.72% at December 31, 2012(1)		17		21
Total debt issued by Union Bank, N.A. and other subsidiaries		4,513		4,819
Total long-term debt	$	5,314	$	5,622

⁽¹⁾  Long-term debt assumed through PCBC acquisition

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Loans and Allowance for Loan Losses - Outstanding Balances and Carrying Amounts of Purchased Credit-Impaired Loans (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Total outstanding balance	$ 1,956	$ 2,155
Carrying amount	$ 1,103	$ 1,161

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Employee Pension and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Employee Pension and Other Postretirement Benefits

Note 6—Employee Pension and Other Postretirement Benefits

The following table summarizes the components of net periodic benefit cost for the first quarters of 2013 and 2012:

	Pension Benefits						Other Benefits						Superannuation, SERP(1) and  ESBP(2)
	For the Three Months Ended March 31,						For the Three Months Ended March 31,						For the Three Months Ended March 31,
(Dollars in millions)	2013			2012			2013			2012			2013		2012
Components of net periodic benefit cost:
Service cost	$	22		$	18		$	4		$	3		$	—	$	—
Interest cost		25			26			3			3			1		1
Expected return on plan assets		(41	)		(37	)		(4	)		(3	)		—		—
Recognized net actuarial loss		27			23			1			2			1		1
Total net periodic benefit cost	$	33		$	30		$	4		$	5		$	2	$	2

⁽¹⁾  Supplemental Executives Retirement Plan (SERP).

⁽²⁾ Executive Supplemental Benefit Plans (ESBP).

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Commercial Paper and Other Short-Term Borrowings

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Commercial Paper and Other Short-Term Borrowings

Note 7—Commercial Paper and Other Short-Term Borrowings

The following table is a summary of the Company’s commercial paper and other short-term borrowings:

(Dollars in millions)	March 31, 2013		December 31, 2012
Federal funds purchased and securities sold under repurchase agreements with weighted average interest rates of 0.14% and 0.96% at March 31, 2013 and December 31, 2012, respectively	$	248	$	123
Commercial paper, with weighted average interest rates of 0.19% and 0.20% at March 31, 2013 and December 31, 2012, respectively		1,711		1,240
Other borrowed funds:
Term federal funds purchased, with a weighted average interest rate of 0.15% at March 31, 2013		269		—
Total commercial paper and other short-term borrowings	$	2,228	$	1,363

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Fair Value Measurement and Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurement and Fair Value of Financial Instruments

Note 9—Fair Value Measurement and Fair Value of Financial Instruments

Valuation Methodologies

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., an exit price) in an orderly transaction between willing market participants at the measurement date. The Company has an established and documented process for determining fair value for financial assets and financial liabilities that are measured at fair value on either a recurring or nonrecurring basis. When available, quoted market prices are used to determine fair value. If quoted market prices are not available, fair value is based upon valuation techniques that use, where possible, current market-based or independently sourced parameters, such as yield curves, foreign exchange rates, credit spreads, commodity prices, and implied volatilities. Valuation adjustments may be made to ensure the financial instruments are recorded at fair value. These adjustments include amounts that reflect counterparty credit quality and that consider the Company’s creditworthiness in determining the fair value of its trading liabilities. For further information related to the valuation methodologies used for certain financial assets and financial liabilities measured at fair value, see Note 16 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Fair Value Hierarchy

In determining fair value, the Company maximizes the use of observable market inputs and minimizes the use of unobservable inputs. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect the Company’s estimate about market data. Based on the observability of the significant inputs used, the Company classifies its fair value measurements in accordance with the three-level hierarchy as defined by U.S. GAAP. This hierarchy is based on the quality, observability, and reliability of the information used to determine fair value. For further information related to the fair value hierarchy, see Note 16 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Valuation Processes

The Company has established a Valuation Committee (VC) to oversee its valuation framework for measuring fair value and to establish valuation policies and procedures. The VC’s responsibilities include reviewing and approving all fair value measurements and categorizations within the fair value hierarchy and monitoring the use of pricing sources, mark-to-model valuations, dealer quotes, and other valuation processes. The VC reports to the Company’s Risk & Capital Committee and meets at least quarterly.

Independent price verification (IPV) is performed periodically by the Company to test the market data and valuations of substantially all instruments measured at fair value on a recurring basis. As part of its IPV procedures, the Company utilizes third party valuations and both internal and external models to compare pricing sources and perform analysis. Results are formally reported on a quarterly basis to the VC. For further information related to valuation processes, see Note 16 to the consolidated financial statements in the Company’s 2012 Form 10-K.

Fair Value Measurements on a Recurring Basis

The following tables present financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2013 and December 31, 2012, by major category and by valuation hierarchy level:

	March 31, 2013
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets:
U.S. Treasury	$	—		$	51		$	—		$	—		$	51
U.S. government sponsored agencies		—			108			—			—			108
State and municipal		—			5			—			—			5
Commercial paper		—			10			—			—			10
Interest rate derivative contracts		—			966			—			(91	)		875
Commodity derivative contracts		—			111			26			(107	)		30
Foreign exchange derivative contracts		1			49			4			(27	)		27
Equity derivative contracts		—			—			156			(143	)		13
Total trading account assets		1			1,300			186			(368	)		1,119
Securities available for sale:
U.S. government sponsored agencies		—			472			—			—			472
Residential mortgage-backed securities:
U.S. government and government sponsored agencies		—			13,281			—			—			13,281
Privately issued		—			362			—			—			362
Commercial mortgage-backed securities		—			3,563			—			—			3,563
CLOs		—			2,302			—			—			2,302
Asset-backed and other		—			100			—			—			100
Other debt securities:
Direct bank purchase bonds		—			—			1,532			—			1,532
Other		—			98			60			—			158
Equity securities		31			—			—			—			31
Total securities available for sale		31			20,178			1,592			—			21,801
Other assets:
Interest rate hedging contracts		—			24			—			(24	)		—
Other derivative contracts		—			—			1			—			1
Total other assets		—			24			1			(24	)		1
Total assets	$	32		$	21,502		$	1,779		$	(392	)	$	22,921
Percentage of Total		—	%		94	%		8	%		(2	)%		100	%
Percentage of Total Company Assets		—	%		22	%		2	%		—	%		24	%
Liabilities
Trading account liabilities:
Interest rate derivative contracts	$	4		$	894		$	—		$	(452	)	$	446
Commodity derivative contracts		—			90			26			(48	)		68
Foreign exchange derivative contracts		1			48			4			(6	)		47
Equity derivative contracts		—			—			157			—			157
Securities sold, not yet purchased		—			24			—			—			24
Total trading account liabilities		5			1,056			187			(506	)		742
Other liabilities:
FDIC clawback liability		—			—			93			—			93
Other derivative contracts		—			1			3			(1	)		3
Total other liabilities		—			1			96			(1	)		96
Total liabilities	$	5		$	1,057		$	283		$	(507	)	$	838
Percentage of Total		—	%		126	%		34	%		(60	)%		100	%
Percentage of Total Company Liabilities		—			1	%		—			—			1	%

⁽¹⁾  Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.

	December 31, 2012
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets:
U.S. Treasury	$	—		$	1		$	—		$	—		$	1
U.S. government sponsored agencies		—			113			—			—			113
State and municipal		—			15			—			—			15
Commercial paper		—			10			—			—			10
Interest rate derivative contracts		—			1,075			—			(87	)		988
Commodity derivative contracts		—			137			30			(127	)		40
Foreign exchange derivative contracts		1			65			3			(28	)		41
Equity derivative contracts		—			—			103			(103	)		—
Total trading account assets		1			1,416			136			(345	)		1,208
Securities available for sale:
U.S. Treasury		—			—			—			—			—
U.S. government sponsored agencies		—			885			—			—			885
Residential mortgage-backed securities:
U.S government and government sponsored agencies		—			13,333			—			—			13,333
Privately issued		—			443			—			—			443
Commercial mortgage-backed securities		—			2,971			—			—			2,971
CLOs		—			1,959			—			—			1,959
Asset-backed and other		—			146			—			—			146
Other debt securities:
Direct bank purchase bonds		—			—			1,438			—			1,438
Other		—			97			61			—			158
Equity securities		19			—			—			—			19
Total securities available for sale		19			19,834			1,499			—			21,352
Other assets:
Interest rate hedging contracts		—			28			—			(24	)		4
Other derivative contracts		—			1			—			(1	)		—
Total other assets		—			29			—			(25	)		4
Total assets	$	20		$	21,279		$	1,635		$	(370	)	$	22,564
Percentage of Total		—			94	%		7	%		(1	)%		100	%
Percentage of Total Company Assets		—			22	%		1	%		—			23	%
Liabilities
Trading account liabilities:
Interest rate derivative contracts	$	5		$	1,004		$	—		$	(407	)	$	602
Commodity derivative contracts		—			110			30			(42	)		98
Foreign exchange derivative contracts		1			61			3			—			65
Equity derivative contracts		—			—			103			—			103
Securities sold, not yet purchased		—			27			—			—			27
Total trading account liabilities		6			1,202			136			(449	)		895
Other liabilities:
FDIC clawback liability		—			—			92			—			92
Other derivative contracts		—			—			3			—			3
Total other liabilities		—			—			95			—			95
Total liabilities	$	6		$	1,202		$	231		$	(449	)	$	990
Percentage of Total		1	%		121	%		23	%		(45	)%		100	%
Percentage of Total Company Liabilities		—			2	%		—			(1	)%		1	%

⁽¹⁾  Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.

The following tables present a reconciliation of the assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the first quarters of 2013 and 2012. Level 3 available for sale securities at March 31, 2013 and 2012 primarily consisted of direct bank purchase bonds. The Company’s policy is to recognize transfers in and out of Level 1, 2 and 3 as of the end of a reporting period. In the first quarter of 2012, the Company, based on its analysis, transferred its U.S. Treasury and U.S. government sponsored agency securities from Level 1 to Level 2 and certain of its derivative contracts from Level 2 to Level 3.

	For the Three Months Ended
	March 31, 2013
(Dollars in millions)	Trading Assets		Securities Available for Sale			Other Assets		Trading Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	136	$	1,499		$	—	$	(136	)	$	(95	)
Total gains (losses) (realized/unrealized):
Included in income before taxes		47		—			—		(48	)		(1	)
Included in other comprehensive income		—		19			—		—			—
Purchases/additions		3		137			1		—			—
Sales		—		(14	)		—		(3	)		—
Settlements		—		(49	)		—		—			—
Asset (liability) balance, end of period	$	186	$	1,592		$	1	$	(187	)	$	(96	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	47	$	—		$	—	$	(48	)	$	(1	)

	For the Three Months Ended
	March 31, 2012
(Dollars in millions)	Trading Assets		Securities Available for Sale			Trading Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	—	$	48		$	—		$	(51	)
Total gains (losses) (realized/unrealized):
Included in income before taxes		—		—			—			(12	)
Included in other comprehensive income		—		(5	)		—			—
Transfers into Level 3		153		—			(153	)		—
Asset (liability) balance, end of period	$	153	$	43		$	(153	)	$	(63	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	—	$	—		$	—		$	(12	)

The following table presents information about significant unobservable inputs related to the Company’s significant Level 3 assets and liabilities at March 31, 2013.

	March 31, 2013
(Dollars in millions)	Level 3 Fair Value		Valuation Technique(s)	Significant Unobservable Input(s)	Range of Inputs			Weighted Average
Securities available for sale:
Direct bank purchase bonds	$	1,532	Return on equity	Market-required return on capital		13.0 - 15.0	%		14.1	%
				Probability of default		0.0 - 8.0	%		0.6	%
				Loss severity		10.0 - 75.0	%		37.2	%
Other liabilities:
FDIC clawback liability	$	93	Discounted cash flow	Probability of default		0.2 - 100.0	%		57.1	%
				Loss severity		20.0 - 100.0	%		51.0	%

The direct bank purchase bonds use a return on equity valuation technique. This technique uses significant unobservable inputs such as market-required return on capital, probability of default, and loss severity. Increases (decreases) in any of these inputs in isolation would result in a lower (higher) fair value measurement.

The FDIC clawback liability uses a discounted cash flow valuation technique. This technique uses significant unobservable inputs such as probability of default and loss severity. Increases (decreases) in probability of default and loss severity would result in a lower (higher) liability.

Fair Value Measurement on a Nonrecurring Basis

Certain assets may be measured at fair value on a nonrecurring basis. These assets are subject to fair value adjustments that result from the application of the lower of cost or fair value accounting or write-downs of individual assets. For assets measured at fair value on a nonrecurring basis during the first quarters of 2013 and 2012 that were still held on the consolidated balance sheet as of the respective periods ended, the following tables present the fair value of such financial instruments by the level of valuation assumptions used to determine each fair value adjustment:

	March 31, 2013								Loss for the Three Months Ended March 31, 2013
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3
Loans:
Impaired loans	$	90	$	—	$	—	$	90	$	(12	)
Other assets:
OREO		38		—		—		38		(3	)
Total	$	128	$	—	$	—	$	128	$	(15	)
	March 31, 2012								Loss for the Three Months Ended March 31, 2012
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3
Loans:
Impaired loans	$	58	$	—	$	—	$	58	$	(3	)
Other assets:
OREO		71		—		—		71		(8	)
Private equity investments		27		—		—		27		(2	)
Total	$	156	$	—	$	—	$	156	$	(13	)

Loans include individually impaired loans that are measured at fair value based on appraised values of the underlying collateral or market pricing for the loan, adjusted for management judgment, as of the measurement date. The fair value of OREO was primarily based on independent appraisals.

Fair Value of Financial Instruments Disclosures

The tables below present the carrying amount and estimated fair value of certain financial instruments by the level of valuation assumptions held by the Company as of March 31, 2013, and the carrying amount and the estimated fair value at December 31, 2012:

	March 31, 2013
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	5,091	$	5,091	$	5,091	$	—	$	—
Securities held to maturity		1,015		1,036		—		1,036		—
Loans held for investment, net of allowance for loan losses(1)		59,193		60,489		—		—		60,489
FDIC indemnification asset		285		153		—		—		153
Other assets		3		3		—		—		3
Liabilities
Deposits	$	73,990	$	74,254	$	—	$	74,254	$	—
Commercial paper and other short-term borrowings		2,228		2,229		—		2,229		—
Long-term debt		5,314		5,512		—		5,512		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	279	$	279	$	—	$	—	$	279

⁽¹⁾  Excludes lease financing, net of related allowance.

	December 31, 2012
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	5,491	$	5,491	$	5,491	$	—	$	—
Securities held to maturity		1,103		1,135		—		1,135		—
Loans held for investment, net of allowance for loan losses(1)		58,284		59,613		—		—		59,613
FDIC indemnification asset		338		151		—		—		151
Other assets		3		3		—		—		3
Liabilities
Deposits	$	74,255	$	74,524	$	—	$	74,524	$	—
Commercial paper and other short-term borrowings		1,363		1,363		—		1,363		—
Long-term debt		5,622		5,861		—		5,861		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	262	$	262	$	—	$	—	$	262

⁽¹⁾  Excludes lease financing, net of related allowance.

For further information on methodologies for approximating fair values, see Note 16 to the consolidated financial statements in the Company’s 2012 Form 10-K.

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Employee Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 22	$ 18
Interest cost	25	26
Expected return on plan assets	(41)	(37)
Recognized net actuarial loss	27	23
Total net periodic benefit cost	33	30
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	3
Interest cost	3	3
Expected return on plan assets	(4)	(3)
Recognized net actuarial loss	1	2
Total net periodic benefit cost	4	5
Superannuation, SERP and ESBP [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1
Recognized net actuarial loss	1	1
Total net periodic benefit cost	$ 2	$ 2

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Business Segments - Reportable Business Segments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 648	$ 641
Noninterest income (expense)	255	214
Total revenue	903	855
Noninterest expense (income)	713	614
Credit expense (income)	(3)	(1)
Income (loss) before income taxes and including noncontrolling interests	193	242
Income tax expense (benefit)	50	51
Net income (loss) including noncontrolling interest	143	191
Deduct: Net loss from noncontrolling interests	4	4
Net income (loss) attributable to UNBC	147	195
Total assets, end of period-Market View	96,959	92,323	96,992
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	309	268
Noninterest income (expense)	60	56
Total revenue	369	324
Noninterest expense (income)	300	264
Credit expense (income)	6	6
Income (loss) before income taxes and including noncontrolling interests	63	54
Income tax expense (benefit)	25	22
Net income (loss) including noncontrolling interest	38	32
Deduct: Net loss from noncontrolling interests
Net income (loss) attributable to UNBC	38	32
Total assets, end of period-Market View	30,606	25,876
Corporate Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	355	324
Noninterest income (expense)	157	145
Total revenue	512	469
Noninterest expense (income)	273	236
Credit expense (income)	38	39
Income (loss) before income taxes and including noncontrolling interests	201	194
Income tax expense (benefit)	49	52
Net income (loss) including noncontrolling interest	152	142
Deduct: Net loss from noncontrolling interests
Net income (loss) attributable to UNBC	152	142
Total assets, end of period-Market View	39,590	35,540
Other [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	3	69
Noninterest income (expense)	53	28
Total revenue	56	97
Noninterest expense (income)	153	126
Credit expense (income)	(47)	(46)
Income (loss) before income taxes and including noncontrolling interests	(50)	17
Income tax expense (benefit)	(15)	(14)
Net income (loss) including noncontrolling interest	(35)	31
Deduct: Net loss from noncontrolling interests	4	4
Net income (loss) attributable to UNBC	(31)	35
Total assets, end of period-Market View	29,003	33,133
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	(19)	(20)
Noninterest income (expense)	(15)	(15)
Total revenue	(34)	(35)
Noninterest expense (income)	(13)	(12)
Income (loss) before income taxes and including noncontrolling interests	(21)	(23)
Income tax expense (benefit)	(9)	(9)
Net income (loss) including noncontrolling interest	(12)	(14)
Net income (loss) attributable to UNBC	(12)	(14)
Total assets, end of period-Market View	$ (2,240)	$ (2,226)

XML

Commercial Paper and Other Short-Term Borrowings - Summary of Commercial Paper and Other Short-Term Borrowings (Parenthetical) (Detail)	Mar. 31, 2013	Dec. 31, 2012
Federal funds purchased and securities sold under repurchase agreements [Member]
Short-term Debt [Line Items]
Commercial paper and other short-term borrowings, Weighted average interest rate	0.14%	0.96%
Other short-term borrowings [Member]
Short-term Debt [Line Items]
Commercial paper and other short-term borrowings, Weighted average interest rate	0.19%	0.20%
Term federal funds purchased [Member]
Short-term Debt [Line Items]
Commercial paper and other short-term borrowings, Weighted average interest rate	0.15%

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Variable Interest Entities - Carrying Amounts Related to Unconsolidated VIEs (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Variable Interest Entity [Line Items]
Unconsolidated VIEs, Total Assets	$ 907
Unconsolidated VIEs, Total Liabilities	55
Unconsolidated VIEs, Maximum Exposure to Loss	1,276
LIHC investments [Member]
Variable Interest Entity [Line Items]
Unconsolidated VIEs, Total Assets	523
Unconsolidated VIEs, Total Liabilities	21
Unconsolidated VIEs, Maximum Exposure to Loss	886
Renewable energy investments [Member]
Variable Interest Entity [Line Items]
Unconsolidated VIEs, Total Assets	367
Unconsolidated VIEs, Total Liabilities	34
Unconsolidated VIEs, Maximum Exposure to Loss	367
Private capital investment [Member]
Variable Interest Entity [Line Items]
Unconsolidated VIEs, Total Assets	17
Unconsolidated VIEs, Maximum Exposure to Loss	$ 23

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Business Combinations - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 01, 2012
Business Combinations [Abstract]
Business acquisition cash paid		$ 1,500,000,000
Goodwill, adjustments	10,000,000
Loans outstanding	$ 3,700,000,000

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Loans and Allowance for Loan Losses - Loans in Commercial Portfolio Segment and Commercial Loans within Purchased Credit-Impaired Loans Segment Monitored for Credit Quality (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 33,178	$ 32,621
Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	22,319	21,779
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	660	627
Commercial mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,733	9,740
Commercial portfolio [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,712	32,146
Purchased Credit Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	466	475
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	31,171	30,890
Pass [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	21,168	20,961
Pass [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	644	610
Pass [Member] | Commercial mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,355	9,298
Pass [Member] | Commercial portfolio [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	31,167	30,869
Pass [Member] | Purchased Credit Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4	21
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,112	802
Special Mention [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	770	438
Special Mention [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16	17
Special Mention [Member] | Commercial mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	168	194
Special Mention [Member] | Commercial portfolio [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	954	649
Special Mention [Member] | Purchased Credit Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	158	153
Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	895	929
Classified [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	381	380
Classified [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans
Classified [Member] | Commercial mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	210	248
Classified [Member] | Commercial portfolio [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	591	628
Classified [Member] | Purchased Credit Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 304	$ 301

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Business Combinations (Tables)

3 Months Ended

Mar. 31, 2013

Business Combinations [Abstract]

Net Assets Acquired and Estimated Purchase Accounting Adjustments

The following table presents the net assets acquired from PCBC and the estimated purchase accounting adjustments, which include the effects of measurement period adjustments that were applied to the acquisition date fair values during the first quarter of 2013. These adjustments increased goodwill by $10 million.

(Dollars in millions)	December 1, 2012			Adjustments			December 1, 2012 (adjusted)
Purchase price	$	1,516		$	—		$	1,516
Net assets acquired		859			—			859
Purchase accounting adjustments:
Securities available for sale		8			—			8
Loans held for investment		141			5			146
Intangible assets		18			(19	)		(1	)
Other assets		128			8			136
Deposits		(12	)		—			(12	)
Other short-term borrowings		(36	)		—			(36	)
Long-term debt		(14	)		4			(10	)
Other liabilities		11			(8	)		3
Total purchase accounting adjustments		244			(10	)		234
Fair value of net assets acquired		1,103			(10	)		1,093
Goodwill	$	413		$	10		$	423

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Commercial Paper and Other Short-Term Borrowings (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Summary of Commercial Paper and Other Short-Term Borrowings

The following table is a summary of the Company’s commercial paper and other short-term borrowings:

(Dollars in millions)	March 31, 2013		December 31, 2012
Federal funds purchased and securities sold under repurchase agreements with weighted average interest rates of 0.14% and 0.96% at March 31, 2013 and December 31, 2012, respectively	$	248	$	123
Commercial paper, with weighted average interest rates of 0.19% and 0.20% at March 31, 2013 and December 31, 2012, respectively		1,711		1,240
Other borrowed funds:
Term federal funds purchased, with a weighted average interest rate of 0.15% at March 31, 2013		269		—
Total commercial paper and other short-term borrowings	$	2,228	$	1,363

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Loans and Allowance for Loan Losses - Aging of Balance of Loans Held for Investment, Excluding Purchased Credit-Impaired Loans (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 59,264	$ 58,287
30 to 89 Days Past Due	275	355
90 Days or More Past Due	219	207
Total Past Due	494	562
Total loans held for investment, before purchased credit-impaired loans	59,758	58,849
Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	22,415	21,861
30 to 89 Days Past Due	66	68
90 Days or More Past Due	12	2
Total Past Due	78	70
Total loans held for investment, before purchased credit-impaired loans	22,493	21,931
Commercial mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,863	9,869
30 to 89 Days Past Due	38	57
90 Days or More Past Due	17	13
Total Past Due	55	70
Total loans held for investment, before purchased credit-impaired loans	9,918	9,939
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	657	622
30 to 89 Days Past Due	2	5
Total Past Due	2	5
Total loans held for investment, before purchased credit-impaired loans	659	627
Commercial portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	32,935	32,352
30 to 89 Days Past Due	106	130
90 Days or More Past Due	29	15
Total Past Due	135	145
Total loans held for investment, before purchased credit-impaired loans	33,070	32,497
Residential mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	22,835	22,351
30 to 89 Days Past Due	142	181
90 Days or More Past Due	169	173
Total Past Due	311	354
Total loans held for investment, before purchased credit-impaired loans	23,146	22,705
Home equity and other consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,494	3,584
30 to 89 Days Past Due	27	44
90 Days or More Past Due	21	19
Total Past Due	48	63
Total loans held for investment, before purchased credit-impaired loans	3,542	3,647
Consumer portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	26,329	25,935
30 to 89 Days Past Due	169	225
90 Days or More Past Due	190	192
Total Past Due	359	417
Total loans held for investment, before purchased credit-impaired loans	$ 26,688	$ 26,352

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Securities - Securities Held to Maturity with Continuous Unrealized Loss Position (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Total, Unrealized Losses, Recognized in OCI	$ 11	$ 17
Total, Unrealized Losses, Not Recognized in OCI
Collateralized loan obligations (CLOs) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value
Less than 12 months, Unrealized Losses, Recognized in OCI
Less than 12 months, Unrealized Losses, Not Recognized in OCI
12 months or more, Fair Value	78	121
12 months or more, Unrealized Losses, Recognized in OCI	11	17
12 months or more, Unrealized Losses, Not Recognized in OCI
Total, Fair Value	78	121
Total, Unrealized Losses, Recognized in OCI	11	17
Total, Unrealized Losses, Not Recognized in OCI

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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Trading account assets pledged as collateral	$ 40	$ 1
Fair value of securities held to maturity	$ 1,036	$ 1,135
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 1	$ 1
Common stock, share authorized	300,000,000	300,000,000
Common stock, share issued	136,330,830	136,330,830
Common stock, share outstanding	136,330,830	136,330,830

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Securities

3 Months Ended

Mar. 31, 2013

Investments Debt And Equity Securities [Abstract]

Securities

Note 3—Securities

Securities Available for Sale

At March 31, 2013 and December 31, 2012, the amortized cost, gross unrealized gains, gross unrealized losses, and fair values of securities are presented below.

	March 31, 2013
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government sponsored agencies	$	468	$	4	$	—	$	472
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies		13,172		124		15		13,281
Privately issued		358		7		3		362
Commercial mortgage-backed securities		3,500		84		21		3,563
Collateralized loan obligations (CLOs)		2,296		16		10		2,302
Asset-backed and other		99		1		—		100
Asset Liability Management securities		19,893		236		49		20,080
Other debt securities:
Direct bank purchase bonds		1,557		31		56		1,532
Other		154		8		4		158
Equity securities		30		1		—		31
Total securities available for sale	$	21,634	$	276	$	109	$	21,801
	December 31, 2012
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government-sponsored agencies	$	866	$	19	$	—	$	885
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies		13,104		232		3		13,333
Privately issued		445		8		10		443
Commercial mortgage-backed securities		2,863		114		6		2,971
CLOs		1,996		7		44		1,959
Asset-backed and other		145		1		—		146
Asset Liability Management securities		19,419		381		63		19,737
Other debt securities:								—
Direct bank purchase bonds		1,482		27		71		1,438
Other		156		6		4		158
Equity securities		19		—		—		19
Total securities available for sale	$	21,076	$	414	$	138	$	21,352

The Company’s securities available for sale with a continuous unrealized loss position at March 31, 2013 and December 31, 2012 are shown below, identified for periods less than 12 months and 12 months or more.

	March 31, 2013
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies	$	3,693	$	15	$	1	$	—	$	3,694	$	15
Privately issued		21		—		139		3		160		3
Commercial mortgage-backed securities		1,637		21		—		—		1,637		21
CLOs		262		2		309		8		571		10
Asset Liability Management securities		5,613		38		449		11		6,062		49
Other debt securities:
Direct bank purchase bonds		1,028		56		—		—		1,028		56
Other		6		1		39		3		45		4
Total securities available for sale	$	6,647	$	95	$	488	$	14	$	7,135	$	109

	December 31, 2012
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies	$	1,152	$	3	$	13	$	—	$	1,165	$	3
Privately issued		32		—		137		10		169		10
Commercial mortgage-backed securities		675		6		—		—		675		6
CLOs		168		1		980		43		1,148		44
Asset-backed and other		32		—		3		—		35		—
Asset Liability Management securities		2,059		10		1,133		53		3,192		63
Other debt securities:
Direct bank purchase bonds		1,019		71		—		—		1,019		71
Other		34		3		13		1		47		4
Total securities available for sale	$	3,112	$	84	$	1,146	$	54	$	4,258	$	138

At March 31, 2013, the Company did not have the intent to sell any securities in an unrealized loss position before a recovery of the amortized cost, which may be at maturity. The Company also believes that it is more likely than not that it will not have to sell the securities prior to recovery of amortized cost.

Agency residential mortgage-backed securities consist of securities guaranteed by a U.S. government corporation or a government-sponsored enterprise (GSE) such as Fannie Mae, Freddie Mac, and Ginnie Mae. These securities are collateralized by residential mortgage loans and may be prepaid at par prior to maturity. The unrealized losses on agency residential mortgage-backed securities resulted from changes in interest rates and not credit quality. At March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities because the Company determined that the strength of the issuers’ guarantees through direct obligations or support from the U.S. government is sufficient to protect the Company from losses.

Privately issued residential mortgage-backed securities are issued by financial institutions with no guarantee from government sponsored entities. These securities are collateralized by residential mortgage loans and may be prepaid at par prior to maturity. The securities are primarily rated investment grade. The unrealized losses on privately issued residential mortgage-backed securities resulted from declining credit quality of underlying collateral and additional credit spread widening since purchase. The Company estimated loss projections for each security by assessing the loans collateralizing each security. The Company estimates the portion of loss attributable to credit based on the expected cash flows of the underlying collateral using estimates of current key assumptions, such as default rates, loss severity and prepayment rates. With respect to the remaining portfolio, at March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.

Commercial mortgage-backed securities are collateralized by commercial mortgage loans and are generally subject to prepayment penalties. The unrealized losses on commercial mortgage-backed securities resulted from higher market yields since purchase. The Company estimated loss projections for each security by assessing the loans collateralizing each security. The Company estimates the portion of loss attributable to credit based on the expected cash flows of the underlying collateral using estimates of current key assumptions, such as default rates, loss severity and prepayment rates. Based on the analysis performed as of March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.

The Company’s CLOs consist of Cash Flow CLOs. A Cash Flow CLO is a structured finance product that securitizes a diversified pool of loan assets into multiple classes of notes. Cash Flow CLOs pay the note holders through the receipt of interest and principal repayments from the underlying loans unlike other types of CLOs that pay note holders through the trading and sale of underlying collateral. Unrealized losses typically arise from widening credit spreads and deteriorating credit quality of the underlying collateral. Cash flow analysis of the underlying collateral provides an estimate of other-than-temporary impairment, which is performed quarterly when the fair value of a security is lower than its amortized cost. Based on the analysis performed as of March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.

Other debt securities primarily consist of direct bank purchase bonds, which are not rated. The unrealized losses on these bonds resulted from a higher return on capital expected by the secondary market compared with the return on capital required at the time of origination when the bonds were purchased. The Company estimated loss projections for each security by assessing the underlying collateral of each security. The Company estimates the portion of loss attributable to credit based on the expected cash flows of the underlying collateral using estimates of current key assumptions, such as probability of default and loss severity. Cash flow analysis of the underlying collateral provides an estimate of other-than-temporary impairment, which is performed quarterly when the fair value of a security is lower than its amortized cost. Based on the analysis performed as of March 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.

The fair value of debt securities available for sale by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.

	March 31, 2013
(Dollars in millions)	One Year or Less		Over One Year Through Five Years		Over Five Years Through Ten Years		Over Ten Years		Total Fair Value
U.S. government sponsored agencies	$	398	$	74	$	—	$	—	$	472
Residential mortgage-backed securities:
U.S. government agency and government sponsored agencies		5		45		394		12,837		13,281
Privately issued		—		—		7		355		362
Commercial mortgage-backed securities		—		—		978		2,585		3,563
CLOs		—		559		798		945		2,302
Asset-backed and other		1		90		9		—		100
Asset Liability Management securities		404		768		2,186		16,722		20,080
Other debt securities
Direct bank purchase bonds		74		252		803		403		1,532
Other		—		32		21		105		158
Total debt securities available for sale	$	478	$	1,052	$	3,010	$	17,230	$	21,770

The proceeds from sales of securities available for sale and gross realized gains and losses are shown below. The specific identification method is used to calculate realized gains and losses on sales.

	For the Three Months Ended March 31,
(Dollars in millions)	2013		2012
Proceeds from sales	$	5,098	$	1,251
Gross realized gains		99		19

Securities Held to Maturity

The securities held to maturity consist of CLOs and U.S. government and government sponsored agencies residential mortgage-backed securities. Management has asserted the positive intent and ability to hold these securities to maturity. At March 31, 2013 and December 31, 2012, the amortized cost, gross unrealized gains and losses recognized in other comprehensive income (OCI), carrying amount, gross unrealized gains and losses not recognized in OCI, and fair values of securities held to maturity are presented below.

	March 31, 2013
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
CLOs	$	75	$	—	$	11	$	64	$	14	$	—	$	78
U.S. government agency and government sponsored agencies—residential mortgage backed securities		947		4		—		951		7		—		958
Total securities held to maturity	$	1,022	$	4	$	11	$	1,015	$	21	$	—	$	1,036

	December 31, 2012
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
CLOs	$	118	$	—	$	17	$	101	$	20	$	—	$	121
U.S. government agency and government sponsored agencies—residential mortgage backed securities		997		5		—		1,002		12		—		1,014
Total securities held to maturity	$	1,115	$	5	$	17	$	1,103	$	32	$	—	$	1,135

For securities held to maturity, the amount recognized in OCI primarily reflects the unrealized gain or loss at date of transfer to the held to maturity classification, net of amortization. Amortized cost is defined as the original purchase cost, adjusted for any accretion or amortization of a purchase discount or premium, less principal payments and any impairment previously recognized in earnings.

The Company’s securities held to maturity with a continuous unrealized loss position at March 31, 2013 and December 31, 2012 are shown below, separately for periods less than 12 months and 12 months or more.

	March 31, 2013
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
CLOs	$	—	$	—	$	—	$	78	$	11	$	—	$	78	$	11	$	—

	December 31, 2012
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
CLOs	$	—	$	—	$	—	$	121	$	17	$	—	$	121	$	17	$	—

The carrying amount and fair value of securities held to maturity by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.

	March 31, 2013
	Over One Year Through Five Years				Over Ten Years				Total
(Dollars in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
CLOs	$	64	$	78	$	—	$	—	$	64	$	78
U.S. government agency and government sponsored agencies—residential mortgage backed securities		—		—		951		958		951		958
Total securities held to maturity	$	64	$	78	$	951	$	958	$	1,015	$	1,036

Securities Pledged as Collateral

Transactions involving purchases of securities under agreements to resell (reverse repurchase agreements or reverse repos) or sales of securities under agreements to repurchase (repurchase agreements or repos) are accounted for as collateralized financings except where the Company does not have an agreement to sell (or purchase) the same or substantially the same securities before maturity at a fixed or determinable price. The Company’s policy is to obtain possession of collateral with a market value equal to or in excess of the principal amount loaned under resale agreements. Collateral is valued daily, and the Company may require counterparties to deposit additional collateral or return collateral pledged, when appropriate.

The Company separately identifies in the consolidated balance sheets, securities pledged as collateral in secured borrowings and other arrangements when the secured party can sell or repledge the securities. If the secured party cannot resell or repledge the securities that have been placed as collateral, those securities are not separately identified. At March 31, 2013, the Company had $7.0 billion of securities available for sale pledged as collateral where the secured party cannot resell or repledge such securities. These available for sale securities have been pledged to secure borrowings ($0.8 billion), to support unrealized losses on derivative transactions reported in trading liabilities ($0.5 billion) and to secure public and trust deposits ($5.7 billion).

At March 31, 2013 and December 31, 2012, the Company accepted securities as collateral that it is permitted by contract to sell or repledge of $24 million (none of which has been repledged) and $19 million (none of which has been repledged), respectively. These securities were received as collateral for secured lending.

XML

Loans and Allowance for Loan Losses - Information about Impaired Loans by Class (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired loans	$ 619	$ 626
Allowance for impaired loans	49	42
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	263	220
Allowance for impaired loans	30	24
Commercial mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	50	75
Allowance for impaired loans	2
Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	2	35
Allowance for impaired loans
Commercial portfolio [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	315	330
Allowance for impaired loans	32	24
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	279	271
Allowance for impaired loans	16	18
Home equity and other consumer loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	21	21
Allowance for impaired loans	1
Consumer portfolio [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	300	292
Allowance for impaired loans	17	18
Loans excluding purchased credit-impaired loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	615	622
Allowance for impaired loans	49	42
Purchased Credit Impaired [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	4	4
Allowance for impaired loans
With an Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	399	360
Unpaid principal balance	427	388
With an Allowance [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	199	156
Unpaid principal balance	209	167
With an Allowance [Member] | Commercial mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	25	15
Unpaid principal balance	28	18
With an Allowance [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	2
Unpaid principal balance	3
With an Allowance [Member] | Commercial portfolio [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	226	171
Unpaid principal balance	240	185
With an Allowance [Member] | Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	169	186
Unpaid principal balance	182	199
With an Allowance [Member] | Home equity and other consumer loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	3	3
Unpaid principal balance	4	3
With an Allowance [Member] | Consumer portfolio [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	172	189
Unpaid principal balance	186	202
With an Allowance [Member] | Loans excluding purchased credit-impaired loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	398	360
Unpaid principal balance	426	387
With an Allowance [Member] | Purchased Credit Impaired [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	1
Unpaid principal balance	1	1
Without Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	220	266
Unpaid principal balance	265	314
Without Allowance [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	64	64
Unpaid principal balance	65	64
Without Allowance [Member] | Commercial mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	25	60
Unpaid principal balance	34	70
Without Allowance [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans		35
Unpaid principal balance		38
Without Allowance [Member] | Commercial portfolio [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	89	159
Unpaid principal balance	99	172
Without Allowance [Member] | Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	110	85
Unpaid principal balance	124	97
Without Allowance [Member] | Home equity and other consumer loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	18	18
Unpaid principal balance	31	31
Without Allowance [Member] | Consumer portfolio [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	128	103
Unpaid principal balance	155	128
Without Allowance [Member] | Loans excluding purchased credit-impaired loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	217	262
Unpaid principal balance	254	300
Without Allowance [Member] | Purchased Credit Impaired [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans	3	4
Unpaid principal balance	$ 11	$ 14

XML

Commitments, Contingencies and Guarantees - Summary of Commitments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Commitments	$ 28,999
Standby and commercial letters of credit [Member]
Loss Contingencies [Line Items]
Commitments	5,930
Other commitments [Member]
Loss Contingencies [Line Items]
Commitments	$ 712

XML

Fair Value Measurement and Fair Value of Financial Instruments - Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets	$ 3		$ 3
Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	1,119		1,208
Other assets	1		4
Securities available for sale	21,801		21,352
Trading account liabilities	742		895
Total assets	22,921		22,564
Percentage of Total	100.00%		100.00%
Percentage of Total Company Assets	24.00%		23.00%
Other liabilities	96		95
Total liabilities	838		990
Percentage of Total	100.00%		100.00%
Percentage of Total Company Liabilities	1.00%		1.00%
U.S. Treasury [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	51		1
Securities available for sale
U.S. government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	108		113
Securities available for sale	472		885
State and municipal [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	5		15
Other short-term borrowings [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	10		10
Interest rate derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	875		988
Trading account liabilities	446		602
Commodity derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	30		40
Trading account liabilities	68		98
Foreign exchange derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	27		41
Trading account liabilities	47		65
Equity Derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	13
Trading account liabilities	157		103
U.S. government agency and government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	13,281		13,333
Privately issued [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	362		443
Commercial mortgage-backed securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	3,563		2,971
CLOs [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	2,302		1,959
Asset-backed and other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	100		146
Direct bank purchase bonds [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	1,532		1,438
Other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	158		158
Equity securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	31		19
Interest rate hedging contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets			4
Other derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets	1
Other liabilities	3		3
Securities sold, not yet purchased [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account liabilities	24		27
FDIC clawback liability [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other liabilities	93		92
Level 1 [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets
Level 1 [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	1		1
Other assets
Securities available for sale	31		19
Trading account liabilities	5		6
Total assets	32		20
Percentage of Total
Percentage of Total Company Assets
Other liabilities
Total liabilities	5		6
Percentage of Total			1.00%
Percentage of Total Company Liabilities
Level 1 [Member] | U.S. Treasury [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Securities available for sale
Level 1 [Member] | U.S. government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Securities available for sale
Level 1 [Member] | State and municipal [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Level 1 [Member] | Other short-term borrowings [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Level 1 [Member] | Interest rate derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Trading account liabilities	4		5
Level 1 [Member] | Commodity derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Trading account liabilities
Level 1 [Member] | Foreign exchange derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	1		1
Trading account liabilities	1		1
Level 1 [Member] | Equity Derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Trading account liabilities
Level 1 [Member] | U.S. government agency and government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 1 [Member] | Privately issued [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 1 [Member] | Commercial mortgage-backed securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 1 [Member] | CLOs [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 1 [Member] | Asset-backed and other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 1 [Member] | Direct bank purchase bonds [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 1 [Member] | Other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 1 [Member] | Equity securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	31		19
Level 1 [Member] | Interest rate hedging contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets
Level 1 [Member] | Other derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets
Other liabilities
Level 1 [Member] | Securities sold, not yet purchased [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account liabilities
Level 1 [Member] | FDIC clawback liability [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other liabilities
Level 2 [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets
Level 2 [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	1,300		1,416
Other assets	24		29
Securities available for sale	20,178		19,834
Trading account liabilities	1,056		1,202
Total assets	21,502		21,279
Percentage of Total	94.00%		94.00%
Percentage of Total Company Assets	22.00%		22.00%
Other liabilities	1
Total liabilities	1,057		1,202
Percentage of Total	126.00%		121.00%
Percentage of Total Company Liabilities	1.00%		2.00%
Level 2 [Member] | U.S. Treasury [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	51		1
Securities available for sale
Level 2 [Member] | U.S. government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	108		113
Securities available for sale	472		885
Level 2 [Member] | State and municipal [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	5		15
Level 2 [Member] | Other short-term borrowings [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	10		10
Level 2 [Member] | Interest rate derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	966		1,075
Trading account liabilities	894		1,004
Level 2 [Member] | Commodity derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	111		137
Trading account liabilities	90		110
Level 2 [Member] | Foreign exchange derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	49		65
Trading account liabilities	48		61
Level 2 [Member] | Equity Derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Trading account liabilities
Level 2 [Member] | U.S. government agency and government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	13,281		13,333
Level 2 [Member] | Privately issued [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	362		443
Level 2 [Member] | Commercial mortgage-backed securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	3,563		2,971
Level 2 [Member] | CLOs [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	2,302		1,959
Level 2 [Member] | Asset-backed and other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	100		146
Level 2 [Member] | Direct bank purchase bonds [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 2 [Member] | Other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	98		97
Level 2 [Member] | Equity securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 2 [Member] | Interest rate hedging contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets	24		28
Level 2 [Member] | Other derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets			1
Other liabilities	1
Level 2 [Member] | Securities sold, not yet purchased [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account liabilities	24		27
Level 2 [Member] | FDIC clawback liability [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other liabilities
Level 3 [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets	3		3
Level 3 [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	186		136
Other assets	1
Securities available for sale	1,592		1,499
Trading account liabilities	187		136
Total assets	1,779		1,635
Percentage of Total	8.00%		7.00%
Percentage of Total Company Assets	2.00%		1.00%
Other liabilities	96		95
Total liabilities	283		231
Percentage of Total	34.00%		23.00%
Percentage of Total Company Liabilities
Level 3 [Member] | U.S. Treasury [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Securities available for sale
Level 3 [Member] | U.S. government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Securities available for sale
Level 3 [Member] | State and municipal [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Level 3 [Member] | Other short-term borrowings [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Level 3 [Member] | Interest rate derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets
Trading account liabilities
Level 3 [Member] | Commodity derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	26		30
Trading account liabilities	26		30
Level 3 [Member] | Foreign exchange derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	4		3
Trading account liabilities	4		3
Level 3 [Member] | Equity Derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	156		103
Trading account liabilities	157		103
Level 3 [Member] | U.S. government agency and government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 3 [Member] | Privately issued [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 3 [Member] | Commercial mortgage-backed securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 3 [Member] | CLOs [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 3 [Member] | Asset-backed and other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 3 [Member] | Direct bank purchase bonds [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	1,532		1,438
Level 3 [Member] | Other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale	60		61
Level 3 [Member] | Equity securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale
Level 3 [Member] | Interest rate hedging contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets
Level 3 [Member] | Other derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets	1
Other liabilities	3		3
Level 3 [Member] | Securities sold, not yet purchased [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account liabilities
Level 3 [Member] | FDIC clawback liability [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other liabilities	93		92
Netting Adjustment [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	(368)	[1]	(345)	[1]
Other assets	(24)	[1]	(25)	[1]
Securities available for sale		[1]		[1]
Trading account liabilities	(506)	[1]	(449)	[1]
Total assets	(392)	[1]	(370)	[1]
Percentage of Total	(2.00%)	[1]	(1.00%)	[1]
Percentage of Total Company Assets		[1]		[1]
Other liabilities	(1)	[1]		[1]
Total liabilities	(507)	[1]	(449)	[1]
Percentage of Total	(60.00%)	[1]	(45.00%)	[1]
Percentage of Total Company Liabilities		[1]	(1.00%)	[1]
Netting Adjustment [Member] | U.S. Treasury [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets		[1]		[1]
Securities available for sale				[1]
Netting Adjustment [Member] | U.S. government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets		[1]		[1]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | State and municipal [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets		[1]		[1]
Netting Adjustment [Member] | Other short-term borrowings [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets		[1]		[1]
Netting Adjustment [Member] | Interest rate derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	(91)	[1]	(87)	[1]
Trading account liabilities	(452)	[1]	(407)	[1]
Netting Adjustment [Member] | Commodity derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	(107)	[1]	(127)	[1]
Trading account liabilities	(48)	[1]	(42)	[1]
Netting Adjustment [Member] | Foreign exchange derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	(27)	[1]	(28)	[1]
Trading account liabilities	(6)	[1]		[1]
Netting Adjustment [Member] | Equity Derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account assets	(143)	[1]	(103)	[1]
Trading account liabilities		[1]		[1]
Netting Adjustment [Member] | U.S. government agency and government sponsored agencies [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | Privately issued [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | Commercial mortgage-backed securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | CLOs [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | Asset-backed and other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | Direct bank purchase bonds [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | Other [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | Equity securities [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Securities available for sale		[1]		[1]
Netting Adjustment [Member] | Interest rate hedging contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets	(24)	[1]	(24)	[1]
Netting Adjustment [Member] | Other derivative contracts [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other assets		[1]	(1)	[1]
Other liabilities	(1)	[1]		[1]
Netting Adjustment [Member] | Securities sold, not yet purchased [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Trading account liabilities		[1]		[1]
Netting Adjustment [Member] | FDIC clawback liability [Member] | Fair Value Measurements Recurring [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Other liabilities		[1]		[1]

[1] Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.

XML

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Summary of Long-Term Debt

The following is a summary of the Company’s long-term debt:

(Dollars in millions)	March 31, 2013		December 31, 2012
Debt issued by UnionBanCal Corporation
Senior debt:
Fixed rate 3.50% notes due June 2022	$	397	$	397
Subordinated debt:
Fixed rate 5.25% notes due December 2013		404		406
Total debt issued by UnionBanCal Corporation		801		803
Debt issued by Union Bank, N.A. and other subsidiaries
Senior debt:
Fixed and floating rate Federal Home Loan Bank advances with maturities ranging from September 2013 to February 2016. These notes bear a combined weighted-average rate of 1.33% at March 31, 2013 and 1.39% at December 31, 2012		1,800		2,100
Floating rate notes due June 2014. These notes, which bear interest at 0.95% above 3-month LIBOR, had a rate of 1.26% at both March 31, 2013 and December 31, 2012		300		300
Fixed rate 2.125% notes due December 2013		400		399
Fixed rate 3.00% notes due June 2016		699		699
Fixed rate 2.125% notes due June 2017		499		499
Note payable:
Fixed rate 6.03% notes due July 2014 (related to consolidated VIE)		6		6
Subordinated debt:
Fixed rate 5.95% notes due May 2016		726		729
Junior subordinated debt payable to trusts(1):
Floating rate notes with maturities ranging from March 2033 to September 2036. These notes bear a combined weighted-average rate of 2.64% at March 31, 2013 and 2.66% at December 31, 2012		66		66
Capital lease obligations with a combined weighted average interest rate of 4.89% at March 31, 2013 and 4.72% at December 31, 2012(1)		17		21
Total debt issued by Union Bank, N.A. and other subsidiaries		4,513		4,819
Total long-term debt	$	5,314	$	5,622

⁽¹⁾  Long-term debt assumed through PCBC acquisition

XML

Derivative Instruments and Other Financial Instruments Used For Hedging - Notional Amounts, Balance Sheet Location and Fair Value Amounts of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	$ 60,627	$ 60,118
Asset Derivatives, Fair Value	1,338	1,443
Liability Derivatives, Fair Value	1,228	1,320
Not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	53,277	51,718
Asset Derivatives, Fair Value	1,314	1,415
Liability Derivatives, Fair Value	1,228	1,320
Interest rate derivative contracts [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	7,350	8,400
Asset Derivatives, Fair Value	24	28
Liability Derivatives, Fair Value
Interest rate derivative contracts [Member] | Not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	39,545	37,790
Asset Derivatives, Fair Value	966	1,075
Liability Derivatives, Fair Value	898	1,009
Commodity derivative contracts [Member] | Not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	5,703	5,595
Asset Derivatives, Fair Value	137	167
Liability Derivatives, Fair Value	116	140
Foreign exchange derivative contracts [Member] | Not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	4,249	4,593
Asset Derivatives, Fair Value	54	69
Liability Derivatives, Fair Value	53	65
Equity Derivative contracts [Member] | Not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	3,691	3,631
Asset Derivatives, Fair Value	156	103
Liability Derivatives, Fair Value	157	103
Other contracts [Member] | Not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	89	109
Asset Derivatives, Fair Value	1	1
Liability Derivatives, Fair Value	$ 4	$ 3

XML

Securities - Fair Value of Debt Securities Available for Sale by Contractual Maturity (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
One Year or Less	$ 478
Over One Year Through Five Years	1,052
Over Five Years Through Ten Years	3,010
Over Ten Years	17,230
Total Fair Value	21,770
U.S. government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less	398
Over One Year Through Five Years	74
Over Five Years Through Ten Years
Over Ten Years
Total Fair Value	472
U.S. government agency and government sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less	5
Over One Year Through Five Years	45
Over Five Years Through Ten Years	394
Over Ten Years	12,837
Total Fair Value	13,281
Privately issued [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less
Over One Year Through Five Years
Over Five Years Through Ten Years	7
Over Ten Years	355
Total Fair Value	362
Commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less
Over One Year Through Five Years
Over Five Years Through Ten Years	978
Over Ten Years	2,585
Total Fair Value	3,563
Collateralized loan obligations (CLOs) [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less
Over One Year Through Five Years	559
Over Five Years Through Ten Years	798
Over Ten Years	945
Total Fair Value	2,302
Asset-backed and other [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less	1
Over One Year Through Five Years	90
Over Five Years Through Ten Years	9
Over Ten Years
Total Fair Value	100
Asset Liability Management securities [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less	404
Over One Year Through Five Years	768
Over Five Years Through Ten Years	2,186
Over Ten Years	16,722
Total Fair Value	20,080
Direct bank purchase bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less	74
Over One Year Through Five Years	252
Over Five Years Through Ten Years	803
Over Ten Years	403
Total Fair Value	1,532
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
One Year or Less
Over One Year Through Five Years	32
Over Five Years Through Ten Years	21
Over Ten Years	105
Total Fair Value	$ 158

XML

Business Segments

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Business Segments

Note 13—Business Segments

The Company has three operating segments: Retail Banking Group, Corporate Banking Group and Pacific Rim Corporate Group. The Pacific Rim Corporate Group is included in “Other.” The Company has two reportable business segments: Retail Banking and Corporate Banking.

access 24-hours-a-day. These products offered include mortgages, home equity lines of credit, consumer and commercial loans, and deposit accounts.

• Corporate Banking provides credit, depository and cash management services, investment and risk management products to businesses, individuals and target specialty niches. Services include commercial and project finance loans, real estate financing, asset-based financing, trade finance and letters of credit, lease financing, customized cash management services and capital markets products, as well as trust, private banking, investment and asset management services for individuals and institutions.

“Other” is comprised of certain subsidiaries of UnionBanCal Corporation; the transfer pricing center; the amount of the provision for credit losses over/(under) the expected loss for the period; the residual costs of support groups; goodwill, intangible assets, and the related amortization/accretion associated with the Company’s privatization transaction; the elimination of the fully taxable-equivalent basis amount; and the difference between the marginal tax rate and the consolidated effective tax rate. In addition, “Other” includes Pacific Rim Corporate Group, which offers a range of credit, deposit, and investment management products and services to companies located primarily in the U.S. that are affiliated with companies headquartered in Japan and other Asian countries, Corporate Treasury, which is responsible for Asset-Liability Management (ALM), wholesale funding, the ALM investment securities and derivatives hedging portfolios, and the FDIC covered assets.

The information, set forth in the table that follows, is prepared using various management accounting methodologies to measure the performance of the individual segments. Unlike financial accounting, there is no authoritative body of guidance for management accounting equivalent to U.S. GAAP. Consequently, reported results are not necessarily comparable with those presented by other companies, and they are not necessarily indicative of the results that would be reported by our business units if they were unique economic entities. The management reporting accounting methodologies, which are enhanced from time to time, measure segment profitability by assigning balance sheet and income statement items to each operating segment. Methodologies that are applied to the measurement of segment profitability include:

• A funds transfer pricing system, which assigns a cost of funds or a credit for funds to assets or liabilities based on their type, maturity or repricing characteristics.

• An activity-based costing methodology, in which certain indirect costs, such as operations and technology expense, are allocated to the segments based on studies of billable unit costs for product or data processing. Other indirect costs, such as corporate overhead, are allocated to the segments based on internal surveys and metrics that serve as proxies for estimated usage.

• An expected credit loss allocation methodology, in which credit expense is charged to an operating segment based upon expected losses arising from credit risk. As a result of the methodology used in this model, differences between the provision for credit losses and credit expense in any one period could be significant. However, over an economic cycle, the cumulative provision for credit losses and credit expense for expected losses should be substantially the same.

The Company reflects a “market view” perspective in measuring the business segments. The market view is a measurement of customer markets aggregated to show all revenues generated and expenses incurred from all products and services sold to those customers regardless of where product areas organizationally report. Therefore, revenues and expenses are included in both the business segment that provides the service and the business segment that manages the customer relationship. The duplicative results from this internal management accounting view are eliminated in “Reconciling Items.”

The reportable business segment results for prior periods have been adjusted to reflect changes in the transfer pricing and overhead methodologies that have occurred.

	Retail Banking				Corporate Banking
	As of and for the Three Months Ended March 31,				As of and for the Three Months Ended March 31,
	2013		2012		2013		2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	309	$	268	$	355	$	324
Noninterest income (expense)		60		56		157		145
Total revenue		369		324		512		469
Noninterest expense (income)		300		264		273		236
Credit expense (income)		6		6		38		39
Income (loss) before income taxes and including noncontrolling interests		63		54		201		194
Income tax expense (benefit)		25		22		49		52
Net income (loss) including noncontrolling interest		38		32		152		142
Deduct: Net loss from noncontrolling interests		—		—		—		—
Net income (loss) attributable to UNBC	$	38	$	32	$	152	$	142
Total assets, end of period—Market View (Dollars in millions):	$	30,606	$	25,876	$	39,590	$	35,540

	Other						Reconciling Items
	As of and for the Three Months Ended March 31,						As of and for the Three Months Ended March 31,
	2013			2012			2013			2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	3		$	69		$	(19	)	$	(20	)
Noninterest income (expense)		53			28			(15	)		(15	)
Total revenue		56			97			(34	)		(35	)
Noninterest expense (income)		153			126			(13	)		(12	)
Credit expense (income)		(47	)		(46	)		—			—
Income (loss) before income taxes and including noncontrolling interests		(50	)		17			(21	)		(23	)
Income tax expense (benefit)		(15	)		(14	)		(9	)		(9	)
Net income (loss) including noncontrolling interest		(35	)		31			(12	)		(14	)
Deduct: Net loss from noncontrolling interests		4			4			—			—
Net income (loss) attributable to UNBC	$	(31	)	$	35		$	(12	)	$	(14	)
Total assets, end of period—Market View (Dollars in millions):	$	29,003		$	33,133		$	(2,240	)	$	(2,226	)

	UnionBanCalCorporation
	As of and for the Three Months Ended March 31,
	2013			2012
Results of operations—Market View (Dollars in millions):
Net interest income (expense)	$	648		$	641
Noninterest income (expense)		255			214
Total revenue		903			855
Noninterest expense (income)		713			614
Credit expense (income)		(3	)		(1	)
Income (loss) before income taxes and including noncontrolling interests		193			242
Income tax expense (benefit)		50			51
Net income (loss) including noncontrolling interest		143			191
Deduct: Net loss from noncontrolling interests		4			4
Net income (loss) attributable to UNBC	$	147		$	195
Total assets, end of period—Market View (Dollars in millions):	$	96,959		$	92,323