MUFG Americas (UB) 10-K 10 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 28, 2014
Document And Entity Information	'	'
Entity Registrant Name	'UNIONBANCAL CORP	'
Entity Central Index Key	'0001011659	'
Document Type	'10-K	'
Document Period End Date	31-Dec-13	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Well-known Seasoned Issuer	'No	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Public Float	$0	'
Entity Common Stock, Shares Outstanding	'	136,330,830
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'FY	'
Trading Symbol	'ub	'

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Income	'	'	'
Loans	$2,641	$2,439	$2,254
Securities	469	527	538
Other	13	6	8
Total interest income	3,123	2,972	2,800
Interest Expense	'	'	'
Deposits	248	214	204
Commercial paper and other short-term borrowings	5	9	6
Long-term debt	154	147	149
Total interest expense	407	370	359
Net Interest Income	2,716	2,602	2,441
(Reversal of) provision for loan losses	-45	25	-202
Net interest income after (reversal of) provision for loan losses	2,761	2,577	2,643
Noninterest Income	'	'	'
Service charges on deposit accounts	209	209	206
Trust and investment management fees	135	119	132
Trading account activities	61	101	97
Securities gains, net	178	108	58
Credit facility fees	111	105	94
Merchant banking fees	93	89	97
Brokerage commissions and fees	46	39	39
Card processing fees, net	34	32	59
Other, net	9	16	45
Total noninterest income	876	818	827
Noninterest Expense	'	'	'
Salaries and employee benefits	1,631	1,479	1,385
Net occupancy and equipment	306	267	267
Professional and outside services	250	228	209
Regulatory assessments	74	65	69
Intangible asset amortization	65	81	106
(Reversal of) provision for losses on unfunded credit commitments	16	-17	-29
Other	451	463	408
Total noninterest expense	2,793	2,566	2,415
Income before income taxes and including noncontrolling interests	844	829	1,055
Income tax expense	195	220	308
Net Income including Noncontrolling Interests	649	609	747
Deduct: Net loss from noncontrolling interests	18	19	15
Net Income attributable to UnionBanCal Corporation (UNBC)	$667	$628	$762

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Comprehensive Income	'	'	'
Net Income Attributable to UNBC	$667	$628	$762
Other Comprehensive Income (Loss), Net of Tax:	'	'	'
Net change in unrealized gains (losses) on cash flow hedges	-8	41	4
Net change in unrealized gains (losses) on investment securities	-487	266	131
Foreign currency translation adjustment	-4	1	-1
Net change in gains (losses) on pension and other postretirement benefits	389	-13	-266
Total other comprehensive income (loss)	-110	295	-132
Comprehensive Income (Loss) Attributable to UNBC	557	923	630
Comprehensive loss from noncontrolling interests	-18	-19	-15
Total Comprehensive Income (Loss)	$539	$904	$615

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Assets	'	'
Cash and due from banks	$1,863	$1,845
Interest bearing deposits in banks	4,329	3,477
Federal funds sold and securities purchased under resale agreements	11	169
Total cash and cash equivalents	6,203	5,491
Trading account assets (includes $8 at December 31, 2013 and $1 at December 31, 2012 of assets pledged as collateral)	851	1,208
Securities available for sale	15,817	21,352
Securities held to maturity (Fair value: December 31, 2013, $6,439; December 31, 2012, $1,135)	6,509	1,103
Loans held for investment	68,312	60,034
Allowance for loan losses	-568	-653
Loans Held for Investment, net	67,744	59,381
Premises and equipment, net	688	710
Goodwill	3,228	2,942
Other assets	4,854	4,821
Total assets	105,894	97,008
Deposits:	'	'
Noninterest bearing	26,495	25,478
Interest bearing	53,606	48,826
Total deposits	80,101	74,304
Commercial paper and other short-term borrowings	2,563	1,363
Long-term debt	6,547	5,622
Trading account liabilities	540	895
Other liabilities	1,675	2,099
Total liabilities	91,426	84,283
Commitments, contingencies and guarantees - See Note 21	'	'
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 December 31, 2013 and December 31, 2012	136	136
Additional paid-in capital	7,191	5,994
Retained earnings	7,512	6,845
Accumulated other comprehensive loss	-624	-514
Total UNBC stockholder's equity	14,215	12,461
Noncontrolling interests	253	264
Total equity	14,468	12,725
Total liabilities and equity	$105,894	$97,008

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, except Share data, unless otherwise specified
Consolidated Balance Sheets	'	'
Trading account assets pledged as collateral	$8	$1
Fair value of securities held to maturity	$6,439	$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

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholder's Equity (USD $)		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
In Millions, except Share data
BALANCE, beginning at Dec. 31, 2010		$10,378	$136	$5,198	$5,455	($677)	$266
BALANCE beginning, shares at Dec. 31, 2010		'	136,330,829	'	'	'	'
Net income (loss)		747	'	'	762	'	-15
Other comprehensive income (loss), net of tax		-132	'	'	'	-132	'
Capital Contribution from BTMU	[1]	783	'	783	'	'	'
Capital Contribution from BTMU, shares		'	1	'	'	'	'
Compensation - restricted stock units		8	'	8	'	'	'
Other		17	'	'	'	'	17
Net change		1,423	'	791	762	-132	2
Net change, shares		'	1	'	'	'	'
BALANCE, ending at Dec. 31, 2011		11,801	136	5,989	6,217	-809	268
BALANCE ending, shares at Dec. 31, 2011		'	136,330,830	'	'	'	'
Net income (loss)		609	'	'	628	'	-19
Other comprehensive income (loss), net of tax		295	'	'	'	295	'
Compensation - restricted stock units		5	'	5	'	'	'
Other		15	'	'	'	'	15
Net change		924	'	5	628	295	-4
BALANCE, ending at Dec. 31, 2012		12,725	136	5,994	6,845	-514	264
BALANCE ending, shares at Dec. 31, 2012		'	136,330,830	'	'	'	'
Net income (loss)		649	'	'	667	'	-18
Other comprehensive income (loss), net of tax		-110	'	'	'	-110	'
Capital Contribution from BTMU		1,200	'	1,200	'	'	'
Compensation - restricted stock units		-5	'	-5	'	'	'
Other		9	'	2	'	'	7
Net change		1,743	'	1,197	667	-110	-11
BALANCE, ending at Dec. 31, 2013		$14,468	$136	$7,191	$7,512	($624)	$253
BALANCE ending, shares at Dec. 31, 2013		'	136,330,830	'	'	'	'
[1]	For additional information on the capital contribution, refer to Note 22 to these consolidated financial statements.

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities:	'	'	'
Net income including noncontrolling interests	$649	$609	$747
Adjustments to reconcile net income to net cash provided by (used in) operating activities:	'	'	'
(Reversal of) provision for loan losses	-45	25	-202
(Reversal of) provision for losses on unfunded credit commitments	16	-17	-29
Depreciation, amortization and accretion, net	509	518	332
Stock-based compensation - restricted stock units	21	5	8
Deferred income taxes	61	81	128
Net gains on sales of securities	-178	-108	-58
Net decrease (increase) in trading account assets	357	-74	-136
Net decrease (increase) in other assets	-312	357	181
Net increase (decrease) in trading account liabilities	-355	-144	265
Net increase (decrease) in other liabilities	363	-531	515
Loans originated for sale	-276	-58	-19
Net proceeds from sale of loans originated for sale	226	34	22
Pension and other benefits	-262	-26	42
Other, net	-37	-70	31
Total adjustments	88	-8	1,080
Net cash provided by (used in) operating activities	737	601	1,827
Cash Flows from Investing Activities:	'	'	'
Proceeds from sales of securities available for sale	8,340	6,845	4,556
Proceeds from paydowns and maturities of securities available for sale	3,451	7,657	5,758
Purchases of securities available for sale and held to maturity	-12,788	-10,440	-12,257
Proceeds from paydowns and maturities of securities held to maturity	501	238	157
Purchases of premises and equipment	-63	-97	-86
Proceeds from sales of loans	627	316	223
Net decrease (increase) in loans	-5,333	-4,355	-5,801
Proceeds from FDIC loss share agreements	2	68	134
Net cash acquired from (paid for) acquisitions	-3,185	53	-10
Other, net	-131	-36	-5
Net cash provided by (used in) investing activities	-8,579	249	-7,331
Cash Flows from Financing Activities:	'	'	'
Net increase (decrease) in deposits	5,224	4,230	4,491
Net increase (decrease) in commercial paper and other short-term borrowings	1,200	-2,670	2,289
Common equity contribution from The Bank of Tokyo-Mitsubishi UFJ, Ltd. (BTMU)	1,200	'	618
Proceeds from issuance of subordinated debt due to BTMU	1,050	'	'
Proceeds from issuance of long-term debt	1,999	895	2,000
Repayment of long-term debt	-2,103	-2,025	-888
Other, net	-25	1	-2
Change in noncontrolling interests	9	15	17
Net cash provided by (used in) financing activities	8,554	446	8,525
Net change in cash and cash equivalents	712	1,296	3,021
Cash and cash equivalents at beginning of period	5,491	4,195	1,174
Cash and cash equivalents at end of period	6,203	5,491	4,195
Cash Paid During the Period For:	'	'	'
Interest	396	404	354
Income taxes, net	15	207	222
Acquisitions:	'	'	'
Fair value of assets acquired	3,487	7,655	38
Fair value of liabilities assumed	573	6,139	15
Supplemental Schedule of Noncash Investing and Financing Activities:	'	'	'
Securities available for sale transferred to securities held to maturity	4,386	155	'
Net transfer of loans held for investment to loans held for sale	592	308	288
Transfer of loans held for investment to other real estate owned assets (OREO)	49	100	169
Carrying amount of securities held to maturity immediately prior to transfer to securities available for sale	'	1,112	'
Transfer of The Bank of Tokyo-Mitsubishi UFJ Trust Company (BTMUT) from BTMU:	'	'	'
Carrying amount of assets acquired	'	'	372
Carrying amount of liabilities acquired	'	'	$207

Summary_of_Significant_Account

Summary of Significant Accounting Policies and Nature of Operations	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies and Nature of Operations	'
Summary of Significant Accounting Policies and Nature of Operations	'
	Note 1—Summary of Significant Accounting Policies and Nature of Operations
	Introduction
	UnionBanCal Corporation is a financial holding company and a bank holding company whose principal subsidiary is Union Bank, N.A. (the Bank or Union Bank). The Company provides a wide range of financial services to consumers, small businesses, middle-market companies and major corporations nationally and internationally.
	On November 4, 2008, the Company became a privately held company (privatization transaction). All of the Company's issued and outstanding shares of common stock are owned by The Bank of Tokyo-Mitsubishi UFJ, Ltd. (BTMU). The Company estimated the fair value of its tangible assets and liabilities as of October 1, 2008 and recorded fair value adjustments to its tangible assets and liabilities equivalent to the proportionate incremental percentage ownership acquired by BTMU in the privatization transaction. The Company's financial condition starting as of December 31, 2008 and forward reflects these fair value adjustments and other amounts recorded.
	Principles of Consolidation and Basis of Financial Statement Presentation
	The consolidated financial statements include the accounts of the Company and other entities in which the Company has a controlling financial interest. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity (VIE). The primary beneficiary of a VIE is the entity that has the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and has the obligation to absorb losses or receive benefits from the VIE that could potentially be significant to the VIE. Results of operations from VIEs are included from the dates that the Company became the primary beneficiary. All intercompany transactions and balances with consolidated entities are eliminated in consolidation.
	The Company accounts for equity investments over which it exerts significant influence using the equity method of accounting. Non-marketable equity investments where the Company does not exert significant influence are accounted for at cost. Investments accounted for under both the equity method and cost method are included in other assets.
	The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America (U.S. GAAP). The policies that materially affect the determination of financial position, results of operations and cash flows are summarized below.
	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 fair value of assets acquired and liabilities assumed (Note 3), the evaluation of other-than-temporary impairment on investment securities (Note 4), the allowance for credit losses (Note 5), purchased credit-impaired loans (Note 5), goodwill impairment (Note 7), pension accounting (Note 16), income taxes (Note 18), fair value of financial instruments (Note 12), and hedge accounting (Note 13).
	Cash and Cash Equivalents
	Cash and cash equivalents include cash and due from banks, interest bearing deposits in banks, and federal funds sold and securities purchased under resale agreements, which have original maturities less than 90 days.
	Resale and Repurchase Agreements
	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. These agreements accounted for as collateralized financings are recorded at the amounts at which the securities were acquired or sold, plus accrued interest, and are carried at amortized cost. The Company's policy is to obtain possession of collateral with a market value equal to or in excess of the principal amount financed under resale agreements. Collateral is valued daily, and the Company may require counterparties to deposit additional collateral or return collateral pledged, when appropriate.
	Trading Account Assets and Liabilities
	Trading account assets are recorded at fair value and include securities that management acquires with the intent to hold for short periods of time in order to take advantage of anticipated changes in fair values or as an accommodation to customers. Substantially all of the securities have a high degree of liquidity and a readily determinable fair value. Interest on trading account assets is included in interest income. Realized gains and losses from the sale of trading account positions and unrealized fair value adjustments are recognized in noninterest income.
	Derivatives included in trading account assets and liabilities are reported at fair value, with changes in fair values included in noninterest income in the period in which the changes occur, taking into consideration the effects of legally enforceable master netting agreements that allow the Company to settle positive and negative positions in the event of bankruptcy. Derivatives included in trading account assets and liabilities are primarily interest rate swaps and options, energy derivative contracts and foreign exchange contracts, entered into either for trading purposes or as an accommodation to customers. Derivatives that are not entered into for trading purposes are classified in other assets or other liabilities.
	Securities
	Securities are classified based on management's intent and recorded on the consolidated balance sheet as of trade date, when acquired in a regular-way trade. Securities for which management has both the positive intent and ability to hold to maturity are classified as held to maturity and are carried at amortized cost. Debt securities and equity securities with readily determinable fair values that are not classified as trading assets or held to maturity are classified as available for sale and are carried at fair value, with the unrealized gains or losses reported net of taxes as a component of accumulated other comprehensive income (loss) in stockholder's equity until realized.
	Interest income on debt securities classified as either available for sale or held to maturity includes the amortization of premiums and the accretion of discounts using a method that produces a level yield and is included in interest income on securities.
	Debt securities in the available for sale and held to maturity portfolios are subject to impairment testing when their fair value is lower than amortized cost at the end of a reporting period. Unrealized losses are considered other-than-temporarily impaired if the Company intends to sell the security, if it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, or if the Company does not expect to recover the entire amortized cost basis of the security. In determining whether impairment is other than temporary, the Company considers expected cash flows utilizing a number of assumptions such as default rates, reinvestment rates, and business models considering current and projected financial performance and overall economic conditions.
	If the Company intends to sell the debt security, or if it is more likely than not that the Company will be required to sell the security before recovery, an other-than-temporary impairment write-down is recognized in earnings equal to the entire difference between the amortized cost basis and fair value of the debt security. However, even if the Company does not expect to sell a debt security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the Company must evaluate the expected cash flows to be received and determine if a credit loss exists. In the event of a credit loss in this case, only the amount of impairment associated with the credit loss is recognized in income and amounts related to factors other than credit losses are recorded in other comprehensive income.
	Marketable equity securities are subject to testing for other-than-temporary impairment when there is a severe or sustained decline in market price below the amount recorded for that investment. The Company considers the issuer's financial condition, capital strength, and near-term prospects in assessing whether other-than-temporary impairment exists. An other-than-temporary impairment results in a write-down recognized in earnings equal to the entire difference between the carrying amount and fair value of the equity security.
	Realized gains and losses on the sale of available for sale securities and credit losses related to other-than-temporary impairment on available for sale and held to maturity securities are included in noninterest income as securities gains, net. The specific identification method is used to calculate realized gains and losses on sales.
	Securities available for sale that are pledged under an agreement to repurchase and which may be sold or repledged under that agreement have been separately identified as pledged as collateral.
	Loans Held for Investment, Purchased Credit-Impaired Loans, Other Acquired Loans and Loans Held for Sale
	Loans held for investment are reported at the principal amounts outstanding, net of charge-offs, unamortized nonrefundable loan fees, direct loan origination costs, purchase premiums and discounts, and a historical fair value adjustment related to the Company's privatization transaction. Where loans are held for investment, the net basis adjustment excluding charge-offs on the loan is generally recognized in interest income on an effective yield basis over the contractual loan term.
	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. Loans are generally placed on nonaccrual when such loans have become contractually past due 90 days with respect to principal or interest. Past due status is determined based on the contractual terms of the loan and the number of payment cycles since the last payment date. Interest accruals are continued past 90 days for certain small business loans and consumer installment loans, which are charged off at 120 days. For the commercial loan portfolio segment, interest accruals are also continued for loans that are both well-secured and in the process of collection.
	When a loan is placed on nonaccrual status, all previously accrued but uncollected interest is reversed against current period interest income. When full collection of the outstanding principal balance is in doubt, subsequent payments received are first applied to unpaid principal and then to uncollected interest. A loan may be returned to accrual status at such time as the loan is brought fully current as to both principal and interest, and such loan is considered to be fully collectible on a timely basis. The Company's policy also allows management to continue the recognition of interest income on certain loans placed on nonaccrual status. This portion of the nonaccrual portfolio is referred to as "Cash Basis Nonaccrual" under which the accrual of interest is suspended and interest income is recognized only when collected. This policy applies to consumer portfolio segment loans and commercial portfolio segment loans that are well-secured and in management's judgment are considered to be fully collectible but the timely collection of payments is in doubt.
	A troubled debt restructuring (TDR) is a restructuring of a loan in which the creditor, for economic or legal reasons related to the borrower's financial difficulties, grants a concession to the borrower that it would not otherwise consider. A loan subject to such a restructuring is accounted for as a TDR. A TDR typically involves a modification of terms such as a reduction of the interest rate below the current market rate for a loan with similar risk characteristics or extending the maturity date of the loan without corresponding compensation or additional support. The Company measures impairment of a TDR using the methodology described for individually impaired loans (see "Allowance for Loan Losses" below). For the 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 the commercial portfolio segment, the Company generally determines 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.
	Loans acquired in a transfer, including business combinations, are recorded at fair value at the acquisition date, factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded for other acquired loans as of the acquisition date.
	For acquired loans where there is evidence of credit deterioration since origination and it is probable at the date of acquisition that the Company will not collect all contractually required principal and interest payments, the loans are accounted for as purchased credit-impaired loans. This guidance requires that the excess of the cash flows initially expected to be collected over the loan's fair value at the acquisition date (i.e., the accretable yield) be accreted into interest income over the loan's estimated remaining life using the effective yield method, provided that the timing and amount of future cash flows is reasonably estimable. Accordingly, such loans are not classified as nonaccrual and are considered to be accruing. The difference between the contractually required payments and the cash flows expected to be collected at acquisition, considering the impact of prepayments, is referred to as the nonaccretable difference. We have aggregated substantially all of the purchased credit-impaired loans into pools based on common risk characteristics, which results in the pool becoming the unit of account.
	Subsequent to acquisition of purchased credit-impaired loans, estimates of cash flows expected to be collected are updated each reporting period based on updated assumptions that are reflective of current market conditions. If there is a probable decrease in cash flows expected to be collected (other than due to decreases in interest rate indices), the Company charges the provision for credit losses, resulting in an increase to the allowance for loan losses. If there is a probable and significant increase in cash flows expected to be collected, the Company will first reverse any previously established allowance for loan losses and then increase interest income as a prospective yield adjustment over the remaining life of the pool of loans, which also has the effect of reclassifying a portion of the nonaccretable difference to accretable yield. The impact of changes in variable interest rates are recognized prospectively as adjustments to interest income.
	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.
	For other acquired loans, the purchase premium or discount is accreted to interest income over the remaining contractual life of the loans when the loans are performing, or immediately upon prepayment.
	Loans held for sale, which are recorded in other assets, are carried at the lower of cost or fair value on an individual basis for commercial loans and on an aggregate basis for residential mortgage loans. Changes in fair value are recognized in other noninterest income. Nonrefundable fees, direct loan origination costs, and purchase premiums and discounts related to loans held for sale are deferred and recognized as a component of the gain or loss on sale. Contractual interest earned on loans held for sale is recognized in interest income.
	The Company primarily offers two types of leases to customers: 1) direct financing leases where the assets leased are acquired without additional financing from other sources, and 2) leveraged leases where a substantial portion of the financing is provided by debt with no recourse to the Company. Direct financing leases and leveraged leases are carried net of unearned income, unamortized nonrefundable fees and related direct costs associated with the origination of leases, and, applicable for leveraged leases only, net of nonrecourse debt.
	Allowance for Loan Losses
	The Company maintains an allowance for loan losses to absorb losses inherent in the loan portfolio. The allowance is based on ongoing, quarterly assessments of the probable estimated losses inherent in the loan portfolio. The allowance is increased by the provision for loan losses, which is charged against current period operating results and decreased by the amount of charge-offs, net of recoveries. The Company's methodology for assessing the appropriateness of the allowance consists of several key elements, which include the allowance for loans collectively evaluated for impairment, the allowance for loans individually evaluated for impairment, and the unallocated allowance. Management estimates probable losses inherent in the portfolio based on a loss emergence period. The loss emergence period is the estimated average period of time between a material adverse event affecting the creditworthiness of a borrower and the subsequent recognition of a loss. Updates of the loss emergence period are performed when significant events cause management to reexamine data. Management develops and documents its systematic methodology for determining the allowance for loan losses by first dividing its portfolio into segments—the commercial segment, consumer segment and purchased credit-impaired loans. The Company further divides the portfolio segments into classes based on initial measurement attributes, risk characteristics or its method of monitoring and assessing credit risk. The classes for the Company include commercial and industrial, commercial mortgage, construction, residential mortgage, home equity and other consumer loans, and purchased credit-impaired loans. While the Company's methodology attributes portions of the allowance to specific portfolio segments, the entire allowance is available to absorb credit losses inherent in the total loan portfolio.
	For the commercial portfolio segment, the allowance for loans collectively evaluated for impairment is calculated by applying loss factors to outstanding loans and most unused commitments, based on the internal risk rating of such loans. Loss factors are based on historical loss experience and may be adjusted for significant qualitative considerations that, in management's judgment, affect the collectability of the portfolio as of the evaluation date. Those qualitative considerations are based upon management's evaluation of certain risks that may be identified from current conditions and developments within the portfolio that are not directly measured in the computation of the loss factors. Loss factors for individually graded credits are derived from a loan migration application that tracks historical losses over an economic cycle, which management believes captures the inherent losses in our loan portfolio.
	For the consumer portfolio segment, loans are generally pooled by product type with similar risk characteristics. The Company estimates the allowance for loans collectively evaluated for impairment based on forecasted losses. For the purchased credit-impaired segment, we charge the provision for loan losses, resulting in an increase to the allowance for loan losses when there is a probable decrease in cash flows expected to be collected.
	The allowance for loans collectively evaluated for impairment also includes attributions for certain sectors within the commercial and consumer portfolio segments to account for probable losses that are currently not reflected in the derived loss factors. Segment attributions are calculated based on migration scenarios for the commercial portfolio and specific attributes applicable to the consumer portfolio. Segment considerations are revised periodically as portfolio and environmental conditions change.
	Estimates of cash flows expected to be collected for purchased credit-impaired loans are updated each reporting period. If there is a probable decrease in expected cash flows to be collected after acquisition (other than due to decreases in interest rate indices or changes in voluntary prepayments), the Company charges the provision for loan losses and establishes an allowance for loan losses.
	The Company individually evaluates for impairment larger nonaccruing loans within the commercial portfolio. Residential mortgage and consumer loans are not individually evaluated for impairment unless they represent TDRs. Loans are considered impaired when the evaluation of current information regarding the borrower's financial condition, loan collateral, and cash flows indicates that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement, including interest payments. The amount of impairment is measured using the present value of expected future cash flows discounted at the loan's effective rate, the loan's observable market price, or the fair value of the collateral, if the loan is collateral dependent.
	The unallocated allowance is composed of attributions that are intended to capture probable losses from adverse changes in credit migration and other inherent losses that are not currently reflected in the allowance for loan losses that are ascribed to our portfolio segments.
	Significant risk characteristics considered in estimating the allowance for credit losses include the following:
	•
	Commercial and industrial—industry specific economic trends and individual borrower financial condition
	•
	Construction and commercial mortgage loans—type of property (i.e., residential, commercial, industrial), geographic concentrations, and risks and individual borrower financial condition
	•
	Residential mortgage and consumer—historical and expected future charge-offs, borrower's credit, property collateral, and loan characteristics
	Loans are charged off in whole or in part when they are considered to be uncollectible. Loans in the commercial loan portfolio segment are generally considered uncollectible based on an evaluation of borrower financial condition as well as the value of any collateral. Loans in the consumer portfolio segment are generally considered uncollectible based on past due status or the execution of certain TDR modifications such as discharge through Chapter 7 bankruptcy and the value of any collateral. Recoveries of amounts previously charged off are recorded as a recovery to the allowance for loan losses.
	Allowance for Losses on Unfunded Credit Commitments
	The Company maintains an allowance for losses on unfunded credit commitments to absorb losses inherent in those commitments upon funding. The Company's methodology for assessing the appropriateness of this allowance is the same as that used for the allowance for loan losses (see "Allowance for Loan Losses" above) and incorporates an assumption based upon historical experience of likely utilization. The allowance for losses on unfunded credit commitments is classified as other liabilities and the change in this allowance is recognized in noninterest expense. Losses on unfunded credit commitments are identified when exposures committed to customers facing difficulty are drawn upon, and subsequently result in charge-offs.
	Premises and Equipment
	Premises and equipment are carried at cost, less accumulated depreciation and amortization, impairment, and fair value adjustments related to the Company's privatization transaction. Depreciation and amortization are calculated using the straight-line method over the estimated useful life of each asset. Lives of premises range from ten to fifty years; lives of furniture, fixtures and equipment range from three to eight years. Leasehold improvements are amortized over the term of the respective lease or the estimated useful life of the improvement, whichever is shorter.
	Long-lived assets that are held for use are evaluated periodically for impairment when events or changes in circumstances indicate that the carrying amount may not be recoverable. Impairment is determined if the expected undiscounted future cash flows of a long-lived asset or group of assets is lower than its carrying amount. In the event of impairment, the Company recognizes a loss for the difference between the carrying amount and the fair value of the asset. The impairment loss is recognized in noninterest expense. Restoration of a previously recognized impairment loss is prohibited.
	Goodwill and Identifiable Intangible Assets
	Intangible assets represent purchased assets that lack physical substance and can be separately distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold, exchanged, or licensed. Intangible assets are recorded at fair value at the date of acquisition.
	Intangible assets that have indefinite lives are tested for impairment at least annually, and more frequently in certain circumstances. Intangible assets that have finite lives, which include core deposit intangibles, customer relationships, non-compete agreements and trade names, are amortized either using the straight-line method or a method that patterns the manner in which the economic benefit is consumed. Intangible assets are amortized over their estimated periods of benefit, which range from three to forty years. The Company periodically evaluates the recoverability of intangible assets and takes into account events or circumstances that warrant revised estimates of useful lives or that indicate that impairment exists.
	Goodwill is assessed for impairment at least annually at the reporting unit level either qualitatively or quantitatively. If the elected qualitative assessment results indicate that it is more likely than not that there is impairment, then the quantitative impairment test is required. Various valuation methodologies are applied to carry out the first step of the quantitative impairment test by comparing the fair value of the reporting unit to its carrying amount, including goodwill. If the fair value of the reporting unit is less than its carrying amount, a second step is required to measure the amount of impairment by comparing the implied fair value of the goodwill assigned to the reporting unit with the carrying amount of that goodwill. Goodwill impairment is recognized through a direct write down to its carrying amount and subsequent reversals of goodwill impairment are prohibited.
	Federal Deposit Insurance Corporation (FDIC) Indemnification Asset
	In conjunction with the FDIC-assisted acquisitions of Frontier and Tamalpais in 2010, the Company entered into loss share agreements with the FDIC. Under the terms of the purchase and assumption and loss share agreements, the FDIC will reimburse the Company for certain losses on the covered assets, subject to specific compliance, servicing, notification and reporting requirements.
At the date of the acquisitions, the Company recorded an indemnification asset at fair value based on the present value of cash flows expected to be collected from the FDIC under the loss share agreements. Subsequent to acquisition, the indemnification asset is accounted for on the same basis as the related FDIC covered assets and is linked to the losses on those assets. The difference between the carrying amount and the undiscounted cash flows that the Company expects to collect from the FDIC is amortized into noninterest income over the life of the FDIC indemnification asset. Any increases in expected cash flows of covered loans due to decreases in expected credit losses are amortized over the lesser of the contractual term of the FDIC loss share agreement and the remaining life of the indemnified assets. Any decreases in cash flows of the covered loans due to increases in expected credit losses will increase the FDIC indemnification asset and adjust the provision for credit losses. At the date of the acquisitions, the Company also recorded a standalone liability for the FDIC's ability to clawback a portion of the loss share reimbursements paid to the Company. Because such consideration is contingently payable to the FDIC, the Company accounts for this liability as a form of contingent consideration that is recorded at fair value through noninterest expense.
Other Real Estate Owned
Other real estate owned (OREO) represents the collateral acquired through foreclosure in full or partial satisfaction of the related loan. OREO is initially recorded in other assets at the date physical possession is received at the fair value as established by a current appraisal, adjusted for estimated costs to sell the asset. Any write-down on the date of transfer from loan classification is charged to the allowance for loan losses. Subsequently, OREO is measured at the lower of the acquisition date fair value or fair value less estimated costs to sell the asset. OREO values are reviewed on an ongoing basis and subsequent declines in an individual property's fair value are recognized in earnings in the current period or in certain instances as a charge to the allowance for loan losses. The net operating results from these assets are included in the current period in noninterest expense as foreclosed asset expense.
Other Investments
The Company invests in private equity investments, which include direct investments in private companies. These nonmarketable equity investments are initially recorded at cost and are accounted for using the cost or equity method of accounting depending on whether the Company has significant influence over the investee. Under the equity method, the investment is adjusted for the Company's share of the investee's net income or loss for the period. Under the cost method, dividends received are recognized in other noninterest income, and dividends received in excess of the investee's earnings are considered a return of investment and are recorded as a reduction of investment cost. These investments are evaluated for other-than-temporary impairment if events or conditions indicate that it is probable that the carrying amount of the investment will not be fully recovered in the foreseeable future. If an investment is determined to be other-than-temporarily impaired, it is written down to its fair value through earnings. Fair value is estimated based on a company's business model, current and projected financial performance, liquidity and overall economic and market conditions. As a practical expedient, fair value can also be estimated using the net asset value (NAV) of the fund. All of these investments are included within other assets and any other-than-temporary impairment is recognized in other noninterest income.
The Company invests in limited liability partnerships and other entities operating qualified affordable housing projects. These low-income housing credit (LIHC) investments provide tax benefits to investors in the form of tax deductions from operating losses and tax credits. The unguaranteed LIHC investments are initially recorded at cost, and the carrying amount is amortized as an expense over the period of available tax credits and tax benefits under the equity method of accounting through noninterest expense. These investments are reviewed periodically for impairment.
The Company invests in guaranteed LIHC investments where the availability of tax credits are guaranteed by a creditworthy entity. The investments are initially recorded at cost. When certain criteria are met, the investment is amortized over the period the tax credits are allocated to provide a constant effective yield, as a component of income tax expense. In other instances, the carrying amount is amortized through noninterest expense over the period of available tax credits and tax benefits under the equity method of accounting. These investments are reviewed periodically for impairment.
The Company also invests in limited liability entities and trusts that operate renewable energy projects, either directly or indirectly. Tax credits, taxable income and distributions associated with these renewable energy projects may be allocated to investors according to the terms of the partnership agreements. These investments are accounted for under the equity method and are reviewed periodically for impairment, considering projected operating results and realizability of tax credits.
Derivative Instruments Used in Hedging Relationships
The Company enters into a variety of derivative contracts as a means of managing the Company's interest rate exposure and designates such derivatives under qualifying hedge relationships. All such derivative instruments are recorded at fair value and are included in other assets or other liabilities, taking into consideration the effects of legally enforceable master netting agreements that allow the Company to settle positive and negative positions and offset cash collateral with the same counterparty on a net basis in the event of bankruptcy.
At hedge inception, the Company designates a derivative instrument as: a hedge of the fair value of a recognized asset or liability (i.e., fair value hedge), or a hedge of the variability in the expected future cash flows associated with an existing recognized asset or liability or a probable forecasted transaction (i.e., cash flow hedge).
Where hedge accounting is applied, the Company formally documents, at hedge inception, its risk management objective and strategy for undertaking the hedge, which includes identification of the hedging instrument, the hedged item or transaction, the nature of the risk being hedged, and how the hedge's effectiveness will be assessed. Both at the inception of the hedge and on an ongoing basis, the hedging relationship must be expected to be highly effective in achieving offsetting cash flows or offsetting changes in fair value attributed to the hedged risk during the hedge period in order to qualify for hedge accounting.
When measuring qualifying cash flow hedges for effectiveness, only ineffectiveness resulting from over-hedging is recorded in earnings as an adjustment to noninterest expense, with other changes in fair value recognized in other comprehensive income. Amounts realized on cash flow hedges related to variable rate loans, deposit liabilities and borrowings are recognized in net interest income in the period in which the cash flow from the hedged item is recognized in earnings. The fair value of cash flow hedges related to forecasted transactions is recognized as an adjustment to the carrying amount of the asset or liability in the period when the forecasted transaction occurs or in noninterest expense if the forecasted transaction no longer is expected to occur. For fair value hedges, any ineffectiveness is recognized in noninterest expense in the period in which it arises. For fair value hedges of interest bearing assets or liabilities, the change in the fair value of the hedged item and the hedging instrument, to the extent completely effective, offsets with no impact on earnings. If a derivative instrument is no longer determined to be highly effective as a designated hedge, hedge accounting is discontinued and subsequent fair value adjustments of the derivative instrument are recorded in earnings.
Transfers of Financial Assets
Transfers of financial assets in which the Company has surrendered control over the transferred assets are accounted for as sales. Control is generally considered to have been surrendered when the transferred assets have been legally isolated from the Company, the transferee has the right to pledge or exchange the assets without any significant constraints, and the Company has not entered into a repurchase agreement, does not hold significant call options and has not written significant put options on the transferred assets. In assessing whether control has been surrendered, the Company considers whether the transferee would be a consolidated affiliate and the impact of all arrangements or agreements made contemporaneously with, or in contemplation of, the transfer, even if they were not entered into at the time of transfer.
Operating Leases
The Company enters into a variety of lease contracts generally for premises and equipment as a lessee. Lease contracts that do not transfer substantially all of the benefits and risks of ownership and do not meet the accounting requirements for capital lease classification are treated as operating leases. The Company accounts for the payments of rent on these contracts on a straight-line basis over the lease term. At inception of the lease term, any periods for which no rents are paid or escalation clauses are stipulated in the lease contract are included in the determination of the rent expense and recognized ratably over the lease term.
The Company records liabilities for legal obligations associated with the future retirement of buildings and leasehold improvements at fair value when incurred. The assets are increased by the related liability and depreciated over the estimated useful life of that asset.
Income Taxes
The Company files consolidated U.S. federal income tax returns, foreign tax returns and various combined and separate company state income tax returns.
Management evaluates two components of income tax expense: current and deferred. Current income tax expense approximates taxes to be paid or refunded for the current period and includes income tax expense related to the Company's uncertain tax positions. Management determines deferred income taxes using the balance sheet method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and recognizes enacted changes in tax rates and laws in the period in which they occur. Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are recognized subject to management's judgment that realization is more likely than not. A tax position that meets the "more likely than not" recognition threshold is measured to determine the amount of benefit to recognize. The tax position is measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement. Foreign taxes paid are generally applied as credits to reduce U.S. federal income taxes payable. Interest and penalties are recognized as a component of income tax expense.
Employee Pension and Other Postretirement Benefits
The Company provides a variety of pension and other postretirement benefit plans for eligible employees and retirees. Provisions for the costs of these employee pension and other postretirement benefit plans are accrued and charged to expense when the benefit is earned.
Stock-Based Compensation
The Company grants restricted stock units settled in American Depositary Receipts (ADRs) representing shares of common stock of the Company's ultimate parent company, Mitsubishi UFJ Financial Group, Inc. (MUFG), to employees. Stock-based compensation is measured at fair value on the grant date and is recognized in the Company's results of operations on a straight-line basis over the vesting period. The amortization of stock-based compensation reflects estimated forfeitures adjusted for actual forfeitures experience.
Business Combinations
The Company accounts for all business combinations using the acquisition method of accounting. Except for certain transactions between entities under common control, assets and liabilities acquired are recorded at fair value at the acquisition date, with the excess of purchase price over the fair value of the net assets acquired (including identifiable intangibles) recorded as goodwill. Management may further adjust the acquisition date fair values for a period of up to one year from the date of acquisition. The recognition at the acquisition date of an allowance for loan losses is not carried over or recorded as of acquisition date, as credit-related factors are incorporated directly into the fair value measurement of the loans.
Recently Issued Accounting Pronouncements That Are Not Yet Effective
Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date
In February 2013, the Financial Accounting Standards Board (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 does not expect the adoption of this guidance to significantly impact the Company's financial position or 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.
Investment Companies—Amendments to the Scope, Measurement, and Disclosure Requirements
In June 2013, the FASB issued ASU 2013-08, Financial Services—Investment Companies (Topic 946)—Amendments to the Scope, Measurement, and Disclosure Requirements, which changes the criteria for determining whether an entity meets the definition of an investment company, requires investment companies to measure noncontrolling ownership interests in other investment companies at fair value (rather than using the equity method of accounting), and requires additional disclosures for investment companies. This guidance is effective for interim and annual periods beginning on January 1, 2014. The revised investment company accounting must be applied to all entities that meet the new investment company definition on the effective date, with a cumulative effect adjustment to beginning retained earnings. Management does not expect the adoption of this guidance to significantly impact the Company's financial position or results of operations.
Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
In July 2013, the FASB issued ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, which specifies that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. However, to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available to settle any additional income taxes that would result from the disallowance of a tax position, or the tax law of the applicable jurisdiction does not require the entity to use the deferred tax asset for such purpose, the unrecognized tax benefit should be presented as a liability. This guidance is applied prospectively beginning on January 1, 2014 to all unrecognized tax benefits that exist on that date, with retrospective application permitted. Early adoption is also permitted. Management does not expect the adoption of this guidance to significantly impact the Company's financial position or results of operations.
Accounting for Investments in Qualified Affordable Housing Projects
In January 2014, the FASB issued ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, which amends guidance on the accounting for investments in qualified affordable housing projects and permits reporting entities to make an accounting policy election to account for investments in qualified affordable housing projects using the proportional amortization method, if certain conditions are met. Under the proportional amortization method, reporting entities amortize the initial cost of the investment in proportion to tax credits and tax benefits received and recognize the amortization as a component of income tax expense. This guidance is effective for public entities for annual periods and interim reporting periods therein, beginning after December 15, 2014, with early adoption permitted. The guidance is required to be applied retrospectively to all periods presented. Management is currently assessing the impact of this guidance on the Company's financial position and results of operations, and expects to adopt the standard in 2014.
Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
In January 2014, the FASB issued ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, which provides guidance on when an in substance repossession or foreclosure of residential real estate has occurred and when a creditor should derecognize the consumer mortgage loan and recognize the residential real estate. The guidance clarifies that an in-substance repossession or foreclosure occurs upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure, or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. In addition, the standard requires additional interim and annual disclosures. The guidance is effective for interim and annual periods beginning on January 1, 2015, with early adoption permitted. Management does not expect the adoption of this guidance to significantly impact the Company's financial position or results of operations.

Correction_of_Prior_Period_Amo

Correction of Prior Period Amounts	12 Months Ended
	Dec. 31, 2013
Correction of Prior Period Amounts	'
Correction of Prior Period Amounts	'
	Note 2—Correction of Prior Period Amounts
	During the third quarter of 2013, the Company corrected prior period errors related to the recognition of income and expense associated with market-linked certificates of deposit. These errors affected historical periods beginning in 2009 through June 30, 2013. The Company recognized certain noninterest income amounts in the period in which the market-linked certificates of deposit originated. These amounts should have been deferred and recognized as a reduction of interest expense over the contractual term of the related certificates of deposit. These errors were not material to any of the Company's previously issued financial statements. In accordance with Securities and Exchange Commission Staff Accounting Bulletin No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements (SAB 108), the consolidated balance sheet as of December 31, 2012 and the consolidated statements of income and comprehensive income for the years ended December 31, 2012 and 2011, and changes in stockholder's equity for the years ended December 31, 2012 and 2011 have been adjusted to reflect the correction of these errors.
	The following tables show the affected line items within the consolidated financial statements:
	Consolidated Statements of Income:
		For the Year Ended							For the Year Ended
		December 31, 2012							December 31, 2011
	(Dollars in millions)	As Previously		Adjustment			As		As Previously		Adjustment			As
		Reported					Corrected		Reported					Corrected
	Net interest income
	Interest expense—deposits	$	233	$	(19	)	$	214	$	216	$	(12	)	$	204
	Noninterest income
	Trading account activities		115		(14	)		101		126		(29	)		97
	Brokerage commissions and fees		44		(5	)		39		47		(8	)		39
	Income before income taxes and including noncontrolling interests		830		(1	)		829		1,081		(26	)		1,055
	Net Income Attributable to UNBC		629		(1	)		628		778		(16	)		762
	Consolidated Balance Sheet and Statements of Changes in Stockholder's Equity:
		December 31, 2012
	(Dollars in millions)	As Previously		Adjustment			As
		Reported					Corrected
	Other assets	$	4,805	$	16		$	4,821
	Interest bearing deposits		48,777		49			48,826
	Other liabilities		2,102		(3	)		2,099
	Retained earnings		6,875		(30	)		6,845
		December 31, 2011							December 31, 2010
	(Dollars in millions)	As Previously		Adjustment			As		As Previously		Adjustment			As
		Reported					Corrected		Reported					Corrected
	Retained earnings	$	6,246	$	(29	)	$	6,217	$	5,468	$	(13	)	$	5,455
	Beginning in 2013, fees associated with certain unused commitment balances are classified within credit facility fees in noninterest income. Such fees were previously recorded in loan interest income and totaled $51 million and $48 million for the years ended December 31, 2012 and 2011, respectively. The Company has corrected the prior period presentation to conform to the presentation adopted at the beginning of 2013.

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2013
Business Combinations	'
Business Combinations	'
	Note 3—Business Combinations
	In December 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 following table presents the net assets acquired from PCBC and the purchase accounting adjustments as of the acquisition date. During the year ended December 31, 2013, measurement period adjustments were applied to the acquisition date fair values, which increased goodwill by $23 million. Goodwill was allocated to the Company's reportable business segments as follows: Retail Banking & Wealth Markets, $268 million; Commercial Banking, $104 million; Corporate Banking, $15 million; Investment Banking & Markets, $26 million; and Transaction Banking, $23 million.
	(Dollars in millions)	December 1, 2012
	Purchase price	$	1,516
	Net assets acquired		859
	Purchase accounting adjustments:
	Securities available for sale		8
	Loans held for investment		141
	Intangible assets		18
	Other assets		128
	Deposits		(12	)
	Other short-term borrowings		(36	)
	Long-term debt		(14	)
	Other liabilities		11
	Total purchase accounting adjustments		244
	Fair value of net assets acquired		1,103
	Goodwill	$	413
	Acquisition of PB Capital
	During the second quarter of 2013, the Company acquired PB Capital Corporation's (PB Capital) institutional commercial real estate (CRE) lending division for $3.7 billion in cash. The acquisition expands the Company's CRE presence in the U.S., and provides geographic and asset class diversification. Excluding the effects of purchase accounting adjustments, the Company acquired approximately $3.5 billion in loans. The assets acquired were recorded at acquisition date fair values of $3.4 billion, resulting in goodwill as of the acquisition date of $227 million, which was allocated to the Company's Commercial Banking reportable business segment. The fair value estimates of the loans acquired are considered provisional and are subject to change for up to one year after the closing date of the acquisition as additional information relative to closing date fair values becomes available. During the year ended December 31, 2013, measurement period adjustments were applied to the acquisition date fair values, which increased goodwill by $11 million.
	Other Acquisitions
	In November 2013, we completed the acquisition of First Bank Association Bank Services, a unit of First Bank, which provides a full range of banking services to homeowners associations and community management companies. We acquired approximately $570 million in deposits in this transaction.
	In October 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 transaction, we acquired approximately $1.0 billion in deposits.

Securities

Securities	12 Months Ended
	Dec. 31, 2013
Securities	'
Securities	'
	Note 4—Securities
	Securities Available for Sale
	At December 31, 2013 and 2012, the amortized cost, gross unrealized gains, gross unrealized losses, and fair values of securities are presented below.
		December 31, 2013
	(Dollars in millions)	Amortized		Gross		Gross		Fair
		Cost		Unrealized		Unrealized		Value
				Gains		Losses
	Asset Liability Management securities:
	U.S. government-sponsored agencies	$	73	$	—	$	—	$	73
	Residential mortgage-backed securities:
	U.S. government agency and government-sponsored agencies		9,194		2		296		8,900
	Privately issued		220		4		2		222
	Commercial mortgage-backed securities		1,947		8		85		1,870
	Collateralized loan obligations		2,670		25		22		2,673
	Asset-backed and other		34		1		—		35
	Asset Liability Management securities		14,138		40		405		13,773
	Other debt securities:
	Direct bank purchase bonds		1,968		35		43		1,960
	Other		81		—		5		76
	Equity securities		7		1		—		8
	Total securities available for sale	$	16,194	$	76	$	453	$	15,817
		December 31, 2012
	(Dollars in millions)	Amortized		Gross		Gross		Fair
		Cost		Unrealized		Unrealized		Value
				Gains		Losses
	Asset Liability Management securities:
	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
	Collateralized loan obligations		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 December 31, 2013 and 2012 are shown below, separately for periods less than 12 months and 12 months or more.
		December 31, 2013
		Less than 12 months				12 months or more				Total
	(Dollars in millions)	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
		Value		Losses		Value		Losses		Value		Losses
	Asset Liability Management securities:
	Residential mortgage-backed securities:
	U.S. government agency and government-sponsored agencies	$	8,508	$	293	$	147	$	3	$	8,655	$	296
	Privately issued		72		2		18		—		90		2
	Commercial mortgage-backed securities		1,274		80		58		5		1,332		85
	Collateralized loan obligations		1,879		21		10		1		1,889		22
	Asset-backed and other		—		—		1		—		1		—
	Asset Liability Management securities		11,733		396		234		9		11,967		405
	Other debt securities:
	Direct bank purchase bonds		537		18		778		25		1,315		43
	Other		15		1		34		4		49		5
	Equity securities		5		—		—		—		5		—
	Total securities available for sale	$	12,290	$	415	$	1,046	$	38	$	13,336	$	453
		December 31, 2012
		Less than 12 months				12 months or more				Total
	(Dollars in millions)	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
		Value		Losses		Value		Losses		Value		Losses
	Asset Liability Management securities:
	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
Collateralized loan obligations		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 December 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 be required 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 December 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.
Commercial mortgage-backed securities (CMBS) are collateralized by commercial mortgage loans and are generally subject to prepayment penalties. The unrealized losses on CMBS 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 December 31, 2013, the Company expects to recover the entire amortized cost basis of these securities.
The Company's collateralized loan obligations (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 December 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 by external credit rating agencies. 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 and potential impairment is identified. Based on the analysis performed as of December 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.
	December 31, 2013
(Dollars in millions)	One Year or		Over One Year		Over Five Years		Over Ten Years		Total Fair
	Less		Through		Through				Value
			Five Years		Ten Years
Asset Liability Management securities:
U.S. government-sponsored agencies	$	73	$	—	$	—	$	—	$	73
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies		2		42		602		8,254		8,900
Privately issued		—		—		6		216		222
Commercial mortgage-backed securities		—		—		34		1,836		1,870
Collateralized loan obligations		—		346		547		1,780		2,673
Asset-backed and other		—		27		8		—		35
Asset Liability Management securities		75		415		1,197		12,086		13,773
Other debt securities:
Direct bank purchase bonds		149		288		1,005		518		1,960
Other		—		22		14		40		76
Total debt securities available for sale	$	224	$	725	$	2,216	$	12,644	$	15,809
The proceeds from sales of securities available for sale and gross realized gains and losses for the years ended December 31, 2013, 2012 and 2011 are shown below. The specific identification method is used to calculate realized gains and losses on sales.
	For the Years Ended
	December 31,
(Dollars in millions)	2013		2012		2011
Proceeds from sales	$	8,340	$	6,845	$	4,556
Gross realized gains		190		113		59
Gross realized losses		3		2		—
Securities Held to Maturity
The securities held to maturity consist of CLOs, CMBS and U.S. government and government-sponsored agencies residential mortgage-backed securities. The Company has the positive intent and ability to hold these securities to maturity. At December 31, 2013 and 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.
	December 31, 2013
			Recognized in						Not Recognized in
			OCI						OCI
(Dollars in millions)	Amortized		Gross		Gross		Carrying		Gross		Gross		Fair
	Cost		Unrealized		Unrealized		Amount		Unrealized		Unrealized		Value
			Gains		Losses				Gains		Losses
U.S. government agency and government-sponsored agencies—residential mortgage backed securities	$	5,065	$	7	$	77	$	4,995	$	8	$	69	$	4,934
Commercial mortgage-backed securities		1,606		—		92		1,514		3		12		1,505
Total securities held to maturity	$	6,671	$	7	$	169	$	6,509	$	11	$	81	$	6,439
	December 31, 2012
			Recognized in						Not Recognized in
			OCI						OCI
(Dollars in millions)	Amortized		Gross		Gross		Carrying		Gross		Gross		Fair
	Cost		Unrealized		Unrealized		Amount		Unrealized		Unrealized		Value
			Gains		Losses				Gains		Losses
U.S. government agency and government-sponsored agencies—residential mortgage backed securities	$	997	$	5	$	—	$	1,002	$	12	$	—	$	1,014
Collateralized loan obligations		118		—		17		101		20		—		121
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 gains or losses 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.
On September 30, 2012, the Company transferred certain of its CLOs with a carrying amount of $1.1 billion from held to maturity to available for sale, due to a significant increase in the risk weights of debt securities used for regulatory capital purposes under rules proposed by the U.S. federal banking agencies in June 2012. The final rules were adopted by the U.S. federal banking agencies in July 2013. These regulatory capital changes were not foreseeable when the Company initially transferred the CLOs from available for sale to held to maturity during the first quarter of 2009. Accordingly, the Company no longer intends to hold these securities to maturity. The carrying amount of the CLOs immediately prior to the transfer on September 30, 2012, totaled $1.1 billion, which included $301 million of unrealized losses in unamortized OCI. Following the transfer, the securities were recorded at fair value, with an unrealized loss of $62 million recorded in OCI.
The Company's securities held to maturity with a continuous unrealized loss position at December 31, 2013 and 2012 are shown below, separately for periods less than 12 months and 12 months or more.
	December 31, 2013
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair		Recognized		Not Recognized		Fair		Recognized		Not Recognized		Fair		Recognized		Not Recognized
	Value		in OCI		in OCI		Value		in OCI		in OCI		Value		in OCI		in OCI
U.S. government agency and government-sponsored agencies—residential mortgage backed securities	$	3,873	$	76	$	68	$	54	$	1	$	1	$	3,927	$	77	$	69
Commercial mortgage-backed securities		1,016		46		10		489		46		2		1,505		92		12
Total securities held to maturity	$	4,889	$	122	$	78	$	543	$	47	$	3	$	5,432	$	169	$	81
	December 31, 2012
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair		Recognized		Not Recognized		Fair		Recognized		Not Recognized		Fair		Recognized		Not Recognized
	Value		in OCI		in OCI		Value		in OCI		in OCI		Value		in OCI		in OCI
Collateralized loan obligations	$	—	$	—	$	—	$	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.
	December 31, 2013
	Over One Year				Over Five Years				Over Ten Years				Total
	Through Five Years				Through Ten Years
(Dollars in millions)	Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value		Amount		Value		Amount		Value
U.S. government agency and government-sponsored agencies—residential mortgage backed securities	$	4	$	4	$	—	$	—	$	4,991	$	4,930	$	4,995	$	4,934
Commercial mortgage-backed securities		—		—		835		834		679		671		1,514		1,505
Total securities held to maturity	$	4	$	4	$	835	$	834	$	5,670	$	5,601	$	6,509	$	6,439
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 December 31, 2013, the Company had $6.1 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 of $0.7 billion, to support unrealized losses on derivative transactions reported in trading liabilities of $0.2 billion and to secure public and trust department deposits of $5.2 billion.
At December 31, 2013 and 2012, the Company accepted securities as collateral for secured lending that it is permitted by contract to sell or repledge of $10 million (none of which has been repledged) and $19 million (none of which has been repledged), respectively.

Loans_and_Allowance_for_Loan_L

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2013
Loans and Allowance for Loan Losses	'
Loans and Allowance for Loan Losses	'
	Note 5—Loans and Allowance for Loan Losses
	The following table provides the outstanding balances of loans at December 31, 2013 and 2012.
		December 31,
	(Dollars in millions)	2013			2012
	Loans held for investment:
	Commercial and industrial	$	23,528		$	20,827
	Commercial mortgage		13,092			9,939
	Construction		905			627
	Lease financing		854			1,104
	Total commercial portfolio		38,379			32,497
	Residential mortgage		25,547			22,705
	Home equity and other consumer loans		3,280			3,647
	Total consumer portfolio		28,827			26,352
	Total loans held for investment, before purchased credit-impaired loans		67,206			58,849
	Purchased credit-impaired loans(1)		1,106			1,185
	Total loans held for investment(2)		68,312			60,034
	Allowance for loan losses		(568	)		(653	)
	Loans held for investment, net	$	67,744		$	59,381
	-1
	Includes $251 million and $421 million as of December 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, $15 million and $24 million as of December 31, 2013 and December 31, 2012, respectively, were not accounted for under accounting guidance for loans acquired with deteriorated credit quality.
	-2
	Includes $88 million and $5 million at December 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 Year Ended December 31, 2013
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
								Credit-
								Impaired
	Allowance for loan losses, beginning of period	$	418		$	124		$	1		$	110		$	653
	(Reversal of) provision for loan losses		18			(29	)		—			(33	)		(44	)
	(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification		—			—			(1	)		—			(1	)
	Decrease in allowance covered by FDIC indemnification		—			—			(8	)		—			(8	)
	Loans charged off		(44	)		(30	)		(3	)		—			(77	)
	Recoveries of loans previously charged off		29			4			12			—			45
	Allowance for loan losses, end of period	$	421		$	69		$	1		$	77		$	568
		For the Year Ended December 31, 2012
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
								Credit-
								Impaired
	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 (increase) 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
		For the Year Ended December 31, 2011
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
								Credit-
								Impaired
	Allowance for loan losses, beginning of period	$	683		$	185		$	25		$	298		$	1,191
	(Reversal of) provision for loan losses		(74	)		37			—			(163	)		(200	)
	(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification		—			—			(2	)		—			(2	)
	Decrease (increase) in allowance covered by FDIC indemnification		—			—			(5	)		—			(5	)
	Other(1)		16			—			—			—			16
	Loans charged off		(217	)		(87	)		(3	)		—			(307	)
	Recoveries of loans previously charged off		66			3			2			—			71
	Allowance for loan losses, end of period	$	474		$	138		$	17		$	135		$	764
	-1
	Other includes a $16 million allowance for loan losses transfer attributed to an internal reorganization on October 1, 2011, in which BTMU transferred its trust company, The Bank of Tokyo-Mitsubishi UFJ Trust Company (BTMUT), to the Company.
	The following tables show the allowance for loan losses and related loan balances by portfolio segment as of December 31, 2013 and 2012.
		December 31, 2013
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
Credit-
Impaired
Allowance for loan losses:
Individually evaluated for impairment	$	19		$	20		$	—		$	—		$	39
Collectively evaluated for impairment		402			49			—			77			528
Purchased credit-impaired loans		—			—			1			—			1
Total allowance for loan losses	$	421		$	69		$	1		$	77		$	568
Loans held for investment:
Individually evaluated for impairment	$	266		$	339		$	3		$	—		$	608
Collectively evaluated for impairment		38,113			28,488			—			—			66,601
Purchased credit-impaired loans		—			—			1,103			—			1,103
Total loans held for investment	$	38,379		$	28,827		$	1,106		$	—		$	68,312
	December 31, 2012
(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
							Credit-
							Impaired
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 December 31, 2013 and 2012.
	December 31,
(Dollars in millions)	2013			2012
Commercial and industrial	$	44		$	48
Commercial mortgage		51			65
Total commercial portfolio		95			113
Residential mortgage		286			306
Home equity and other consumer loans		46			56
Total consumer portfolio		332			362
Total nonaccrual loans, before purchased credit-impaired loans		427			475
Purchased credit-impaired loans		15			30
Total nonaccrual loans	$	442		$	505
Troubled debt restructured loans that continue to accrue interest	$	367		$	401
Troubled debt restructured nonaccrual loans (included in the total nonaccrual loans above)	$	225		$	209
The following tables show an aging of the balance of loans held for investment, excluding purchased credit-impaired loans, by class as of December 31, 2013 and 2012.
	December 31, 2013
	Aging Analysis of Loans
(Dollars in millions)	Current			30 to			90 Days or			Total Past Due			Total
				89 Days			More Past
				Past Due			Due
Commercial and industrial	$	24,310		$	66		$	6		$	72		$	24,382
Commercial mortgage		13,004			68			20			88			13,092
Construction		891			14			—			14			905
Total commercial portfolio		38,205			148			26			174			38,379
Residential mortgage		25,342			114			91			205			25,547
Home equity and other consumer loans		3,238			23			19			42			3,280
Total consumer portfolio		28,580			137			110			247			28,827
Total loans held for investment, excluding purchased credit-impaired loans	$	66,785		$	285		$	136		$	421		$	67,206
	December 31, 2012
	Aging Analysis of Loans
(Dollars in millions)	Current			30 to			90 Days or			Total Past Due			Total
				89 Days			More Past
				Past Due			Due
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 $5 million and $1 million at December 31, 2013 and 2012, respectively. Purchased credit-impaired loans that are 90 days or more past due and still accruing totaled $124 million at both December 31, 2013 and 2012.
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. Loans within the commercial portfolio segment are classified as either pass or criticized. Criticized credits are those that are internally risk graded as special mention, substandard or doubtful. Special mention credits are potentially weak, as the borrower has begun to exhibit deteriorating trends, which, if not corrected, may 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.
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 $213 million and $365 million covered by FDIC loss share agreements, at December 31, 2013 and 2012, respectively. The amounts presented reflect unpaid principal balances less charge-offs.
	December 31, 2013
(Dollars in millions)	Pass			Special Mention			Classified			Total
Commercial and industrial	$	23,346		$	576		$	313		$	24,235
Construction		879			14			—			893
Commercial mortgage		12,562			142			228			12,932
Total commercial portfolio		36,787			732			541			38,060
Purchased credit-impaired loans		48			204			362			614
Total	$	36,835		$	936		$	903		$	38,674
	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 $38 million and $57 million of loans covered by FDIC loss share agreements, at December 31, 2013 and 2012, respectively.
	December 31, 2013
(Dollars in millions)	Accrual			Nonaccrual			Total
Residential mortgage	$	25,261		$	286		$	25,547
Home equity and other consumer loans		3,234			46			3,280
Total consumer portfolio		28,495			332			28,827
Purchased credit-impaired loans		242			—			242
Total	$	28,737		$	332		$	29,069
	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 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 credit lines for home equity 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 December 31, 2013 and 2012. These tables exclude loans covered by FDIC loss share agreements, as discussed above. Loan balances at December 31, 2012 exclude loans serviced by others. The amounts presented reflect unpaid principal balances less partial charge-offs.
	December 31, 2013
	FICO scores
(Dollars in millions)	720 and Above			Below 720			No FICO			Total
							Available(1)
Residential mortgage	$	19,614		$	5,301		$	459		$	25,374
Home equity and other consumer loans		2,283			839			81			3,203
Total consumer portfolio		21,897			6,140			540			28,577
Purchased credit-impaired loans		94			135			15			244
Total	$	21,991		$	6,275		$	555		$	28,821
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).
	December 31, 2012
	FICO scores
(Dollars in millions)	720 and Above			Below 720			No FICO			Total
							Available(1)
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).
	December 31, 2013
	LTV ratios
(Dollars in millions)	Less than 80			80-100			Greater than			No LTV			Total
	Percent			Percent			100 Percent			Available(1)
Residential mortgage	$	23,209		$	1,884		$	228		$	53		$	25,374
Home equity loans		2,487			362			202			52			3,103
Total consumer portfolio		25,696			2,246			430			105			28,477
Purchased credit-impaired loans		152			57			31			—			240
Total	$	25,848		$	2,303		$	461		$	105		$	28,717
Percentage of total		90	%		8	%		2	%		—	%		100	%
-1
Represents loans for which management was not able to obtain refreshed property values.
	December 31, 2012
	LTV ratios
(Dollars in millions)	Less than 80			80-100			Greater than			No LTV			Total
	Percent			Percent			100 Percent			Available(1)
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 TDRs as of December 31, 2013 and 2012. The summary includes those TDRs that are on nonaccrual status and those that continue to accrue interest. The Company had $43 million and $33 million in commitments to lend additional funds to borrowers with loan modifications classified as TDRs as of December 31, 2013 and 2012, respectively.
	December 31,
(Dollars in millions)	2013			2012
Commercial and industrial	$	212		$	215
Commercial mortgage		38			64
Construction		—			35
Total commercial portfolio		250			314
Residential mortgage		315			271
Home equity and other consumer loans		24			21
Total consumer portfolio		339			292
Total restructured loans, excluding purchased credit-impaired loans(1)	$	589		$	606
-1
Amounts exclude $3 million and $4 million of TDRs covered by FDIC loss share agreements at December 31, 2013 and 2012, respectively.
In 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 no charge-offs related to TDR modifications in the year ended December 31, 2013 and $20 million in charge-offs related to TDR modifications in 2012. 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 table provides the pre- and post-modification outstanding recorded investment amounts of TDRs as of the date the restructuring occurred during the years ended December 31, 2013 and 2012.
	For the Year Ended						For the Year Ended
	December 31, 2013						Decemeber 31, 2012
(Dollars in millions)	Pre-Modification			Post-Modification			Pre-Modification			Post-Modification
	Outstanding			Outstanding			Outstanding			Outstanding
	Recorded			Recorded			Recorded			Recorded
	Investment(1)			Investment(2)			Investment(1)			Investment(2)
Commercial and industrial	$	161		$	158		$	154		$	147
Commercial mortgage		70			69			22			21
Construction		—			—			7			7
Total commercial portfolio		231			227			183			175
Residential mortgage		104			103			159			151
Home equity and other consumer loans		9			8			31			19
Total consumer portfolio		113			111			190			170
Total	$	344		$	338		$	373		$	345
-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.
Amounts above exclude TDRs covered by FDIC loss share agreements with pre-modification and post-modification balances of $5 million and $4 million, respectively, for the year ended December 31, 2012. There were no restructurings related to loans covered by FDIC loss share agreements for the year ended December 31, 2013.
The following table provides the recorded investment amounts of TDRs at the date of default, for which there was a payment default during the years ended December 31, 2013 and 2012, 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.
	December 31,
(Dollars in millions)	2013			2012
Commercial and industrial	$	10		$	3
Commercial mortgage		2			1
Construction		—			15
Total commercial portfolio		12			19
Residential mortgage		16			34
Home equity and other consumer loans		2			—
Total consumer portfolio		18			34
Total	$	30		$	53
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 nonaccruing loans within the commercial and industrial, construction, commercial mortgage loans portfolios 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 December 31, 2013 and 2012.
	December 31, 2013
	Recorded Investment												Unpaid Principal
													Balance
(Dollars in millions)	With an			Without an			Total			Allowance			With an			Without an
	Allowance			Allowance						for Impaired			Allowance			Allowance
										Loans
Commercial and industrial	$	117		$	104		$	221		$	16		$	121		$	114
Commercial mortgage		33			12			45			3			36			15
Total commercial portfolio		150			116			266			19			157			129
Residential mortgage		220			95			315			20			236			108
Home equity and other consumer loans		4			20			24			—			4			34
Total consumer portfolio		224			115			339			20			240			142
Total, excluding purchased credit-impaired loans		374			231			605			39			397			271
Purchased credit-impaired loans		2			1			3			—			2			6
Total	$	376		$	232		$	608		$	39		$	399		$	277
	December 31, 2012
	Recorded Investment												Unpaid Principal
													Balance
(Dollars in millions)	With an			Without an			Total			Allowance			With an			Without an
	Allowance			Allowance						for Impaired			Allowance			Allowance
										Loans
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 table presents the average recorded investment in impaired loans and the amount of interest income recognized for impaired loans during 2013, 2012 and 2011 for the commercial, consumer and purchased credit-impaired loans portfolio segments.
	Years Ended December 31,
	2013						2012						2011
(Dollars in millions)	Average			Recognized			Average			Recognized			Average			Recognized
	Recorded			Interest			Recorded			Interest			Recorded			Interest
	Investment			Income			Investment			Income			Investment			Income
Commercial and industrial	$	243		$	14		$	201		$	12		$	185		$	6
Commercial mortgage		53			9			107			1			191			1
Construction		8			3			44			2			56			3
Total commercial portfolio		304			26			352			15			432			10
Residential mortgage		293			10			221			8			117			6
Home equity and other consumer loans		22			1			7			1			2			—
Total consumer portfolio		315			11			228			9			119			6
Total, excluding purchased credit-impaired loans		619			37			580			24			551			16
Purchased credit-impaired loans		4			—			8			1			16			1
Total	$	623		$	37		$	588		$	25		$	567		$	17
In 2013 and 2012, the Company transferred a net $592 million and $308 million of loans from held for investment to held for sale, respectively. The Company sold $627 million and $318 million in loans during 2013 and 2012, respectively.
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 at December 31, 2013 and 2012.
(Dollars in millions)	December 31,			December 31,
	2013			2012
Total outstanding balance	$	1,733		$	2,155
Carrying amount		1,091			1,161
The accretable yield for purchased credit-impaired loans for the years ended December 31, 2013, 2012, and 2011 was as follows:
	For the Years Ended
	December 31,
(Dollars in millions)	2013			2012			2011
Accretable yield, beginning of period	$	590		$	424		$	231
Additions		31			171			—
Accretion		(336	)		(297	)		(192	)
Reclassifications from nonaccretable difference during the period		93			292			385
Accretable yield, end of period	$	378		$	590		$	424
Loan Concentrations
The Company's most significant concentration of credit risk within its loan portfolio includes residential real estate mortgage loans, loans made to the real estate industry sector, primarily to construction companies and real estate developers and operators, loans made to the power and utilities sector, and loans made to the oil and gas sector. At December 31, 2013, the Company had $26 billion in residential mortgage loans, primarily in California, and $14 billion, $5 billion, and $4 billion in loans made to the real estate industry sector, power and utilities sector, and manufacturing sector, respectively. The Company also had an additional $5 billion, $8 billion, and $4 billion in unfunded commitments to extend credit to customers in the real estate industry, power and utilities, and manufacturing sectors, respectively.

Premises_and_Equipment_and_Oth

Premises and Equipment and Other Assets	12 Months Ended
	Dec. 31, 2013
Premises and Equipment and Other Assets	'
Premises and Equipment and Other Assets	'
	Note 6—Premises and Equipment and Other Assets
	Premises and Equipment
	Premises and equipment are carried at cost, less accumulated depreciation and amortization. As of December 31, 2013 and 2012, the amounts were as follows:
		December 31,
		2013							2012
	(Dollars in millions)	Cost		Accumulated			Net Book		Cost		Accumulated			Net Book
				Depreciation and			Value				Depreciation and			Value
				Amortization							Amortization
	Land	$	154	$	(—	)	$	154	$	155	$	(—	)	$	155
	Premises		621		(328	)		293		689		(386	)		303
	Leasehold improvements		298		(218	)		80		342		(242	)		100
	Furniture, fixtures and equipment		670		(509	)		161		709		(557	)		152
	Total	$	1,743	$	(1,055	)	$	688	$	1,895	$	(1,185	)	$	710
	Rental, depreciation and amortization expenses were as follows:
		Years Ended December 31,
	(Dollars in millions)	2013		2012			2011
	Rental expense of premises	$	111	$	85		$	86
	Less: rental income		9		8			8
	Net rental expense	$	102	$	77		$	78
	Depreciation and amortization of premises and equipment	$	110	$	102		$	101
	Future minimum lease payments at December 31, 2013 were as follows:
	(Dollars in millions)	2013
	Years ending December 31,:
	2014	$	111
	2015		107
	2016		99
	2017		87
	2018		73
	Thereafter		229
	Total minimum lease payments	$	706
	Minimum rental income due in the future under subleases	$	2
	The Company's leases are for land, branch or office space. A majority of the leases provide for the payment of taxes, maintenance, insurance, and certain other expenses applicable to the leased premises. Many of the leases contain extension provisions and escalation clauses. These leases are generally renewable and may in certain cases contain provisions and options to expand or contract space, renew or terminate the lease or purchase the leased premises at predetermined contractual dates. In addition, escalation clauses may exist, which are tied to either a predetermined rate or may change based on a specified percentage increase or the Consumer Price Index.
	At December 31, 2013 and 2012, the Company had a liability of $6 million for asset retirement obligations. These obligations include environmental remediation on buildings and the removal of leasehold improvements from leased premises to be vacated in cases where management has sufficient information to estimate the obligation's fair value.
	Other Assets
	The following table shows the balances of other assets as of December 31, 2013 and 2012.
	(Dollars in millions)	December 31,		December 31,
		2013		2012
	Other investments	$	2,211	$	1,574
	Prepaid expenses		509		173
	Intangible assets		290		376
	OREO		57		111
	Other		1,787		2,587
	Total other assets	$	4,854	$	4,821

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Other Intangible Assets	'
Goodwill and Other Intangible Assets	'
	Note 7—Goodwill and Other Intangible Assets
	As a result of the acquisition of PCBC, the Company recorded goodwill, core deposit intangible assets, customer relationship intangible assets, and other intangibles assets totaling $436 million, $29 million, $10 million, and $6 million, respectively. The core deposit and customer relationship intangible assets will be amortized over approximately 10 years based upon the total economic benefits received. As a result of the acquisition of PB Capital, the Company recorded goodwill and intangibles assets totaling $238 million and less than $1 million, respectively. As a result of the acquisition of First Bank Association Bank Services, the Company recorded goodwill of $30 million. See Note 3 to these consolidated financial statements for information on the Company's business combinations.
	Goodwill
	The changes in the carrying amount of goodwill during 2013 and 2012 are shown in the table below.
	(Dollars in millions)	2013		2012
	Goodwill, beginning of year	$	2,942	$	2,457
	Net change from business combinations		286		485
	Goodwill, end of year	$	3,228	$	2,942
	As discussed in Note 23, Business Segments, the composition of the Company's reportable segments, including goodwill reporting units, was revised during the fourth quarter of 2013. Goodwill was reassigned to the new reporting units using a relative fair value allocation.
	For impairment testing, goodwill was assigned to the following operating segments at December 31, 2013:
	(Dollars in millions)	2013
	Retail Banking & Wealth Markets	$	1,527
	Commercial Banking		1,034
	Corporate Banking		149
	Transaction Banking		251
	Investment Banking & Markets		253
	Asian Corporate Banking		14
	Goodwill, end of year	$	3,228
	For impairment testing, goodwill was assigned to the following operating segments at December 31, 2012:
	(Dollars in millions)	2012
	Retail Banking	$	1,474
	Corporate Banking		1,454
	Pacific Rim		14
	Goodwill, end of year	$	2,942
	The Company reviews its goodwill for impairment on an annual basis and whenever events or changes in circumstances indicate that the carrying amounts may not be recoverable. The annual goodwill impairment test was performed as of April 1, 2013 and 2012, and no impairment was recognized. The Company also performed an impairment test of goodwill as of October 1, 2013 as a result of the reassignment of goodwill to the new reporting segments discussed above, and no impairment was recognized.
	Intangible Assets
	The table below reflects the Company's identifiable intangible assets and accumulated amortization at December 31, 2013 and 2012.
		December 31, 2013							December 31, 2012
	(Dollars in millions)	Gross		Accumulated			Net		Gross		Accumulated			Net
		Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
		Amount					Amount		Amount					Amount
	Core deposit intangibles	$	667	$	(530	)	$	137	$	669	$	(479	)	$	190
	Trade names		114		(16	)		98		114		(12	)		102
	Customer relationships		63		(22	)		41		75		(17	)		58
	Other		25		(11	)		14		23		(6	)		17
	Subtotal—intangibles with a definite useful life		869		(579	)		290		881		(514	)		367
	Other intangibles with an indefinite useful life		—		—			—		9		—			9
	Total intangibles	$	869	$	(579	)	$	290	$	890	$	(514	)	$	376
	Total amortization expense for 2013, 2012 and 2011 was $65 million, $81 million and $99 million, respectively. Amortization expense for 2011 included an impairment loss of $7 million.
	Estimated future amortization expense at December 31, 2013 is as follows:
	(Dollars in millions)	Core Deposit		Trade Name			Customer		Other		Total Identifiable
		Intangibles (CDI)					Relationships				Intangible Assets
	Years ending December 31, :
	2014	$	39	$	4		$	5	$	3	$	51
	2015		30		3			5		3		41
	2016		18		3			5		3		29
	2017		14		3			5		2		24
	2018		7		3			4		1		15
	Thereafter		29		82			17		2		130
	Total estimated amortization expense	$	137	$	98		$	41	$	14	$	290

Variable_Interest_Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2013
Variable Interest Entities	'
Variable Interest Entities	'
	Note 8—Variable Interest Entities
	In the normal course of business, the Company has certain financial interests in entities which have been determined to be VIEs. Generally, a VIE is a corporation, partnership, trust or other legal structure where the equity investors do not have substantive voting rights, an obligation to absorb the entity's losses or the right to receive the entity's returns, or the ability to direct the significant activities of the entity. The following discusses the Company's consolidated and unconsolidated VIEs.
	Consolidated VIEs
	The following tables present the assets and liabilities of consolidated VIEs recorded on the Company's consolidated balance sheet at December 31, 2013.
		December 31, 2013
		Consolidated Assets								Consolidated Liabilities
	(Dollars in millions)	Interest Bearing		Loans Held for		Other Assets		Total Assets		Long-Term		Total
		Deposits in		Investment, net						Debt		Liabilities
		Banks
	LIHC investments	$	9	$	—	$	262	$	271	$	4	$	4
	Leasing investments		1		750		8		759		—		—
	Total consolidated VIEs	$	10	$	750	$	270	$	1,030	$	4	$	4
	LIHC Investments
	The Company sponsors, manages and syndicates two LIHC investment fund structures. These investments are designed to generate a return primarily through the realization of U.S. federal tax credits and deductions. The Company is considered a primary beneficiary and has consolidated these investments because the Company has the power to direct activities that most significantly impact the funds' economic performances and also has the obligation to absorb losses of the funds that could potentially be significant to the funds. 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.
	Leasing Investments
	The Company has leasing investments primarily in the wind, rail and coal industries. The Company is considered the primary beneficiary and has consolidated these investments because the Company has the power to direct the activities of these entities that significantly impact the entities' economic performances. The Company also has the right to receive potentially significant benefits or the obligation to absorb potentially significant losses of these entities.
	Unconsolidated VIEs
	The following table presents the Company's carrying amounts related to the unconsolidated VIEs and location on the consolidated balance sheet at December 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.
		December 31, 2013
		Unconsolidated Assets								Unconsolidated Liabilities
	(Dollars in millions)	Securities		Loans Held for		Other Assets		Total Assets		Other		Total		Maximum
		Available for		Investment						Liabilities		Liabilities		Exposure to
		Sale												Loss
	LIHC investments	$	122	$	158	$	1,000	$	1,280	$	445	$	445	$	1,280
	Leasing investments		—		—		704		704		—		—		704
	Other investments		—		15		12		27		—		—		27
	Total unconsolidated VIEs	$	122	$	173	$	1,716	$	2,011	$	445	$	445	$	2,011
	LIHC Investments
	The Company makes investments in partnerships and funds formed by third parties. The primary purpose of the partnerships and funds is to invest in low-income housing units and distribute tax credits and tax benefits associated with the underlying properties to investors. The Company is a limited partner investor and is allocated tax credits and deductions, but has no voting or other rights to direct the activities of the funds, and therefore is not considered the primary beneficiary and does not consolidate these investments.
	Leasing Investments
	The unconsolidated VIEs related to leasing investments are primarily renewable energy investments. Through its subsidiaries, the Company makes equity investments in LLCs established by a third party sponsor. The LLCs are created to operate and manage wind, solar, hydroelectric and cogeneration power plant projects. Power generated by the projects is sold to third parties through long-term purchase power agreements. As a limited investor member, the Company is allocated production tax credits and taxable income or losses associated with the projects. The Company has no voting or other rights to direct the activities of the LLCs, and therefore is not considered the primary beneficiary and does not consolidate these entities.
	Other Investments
	Through a subsidiary, the Company has mezzanine debt investments and direct equity investments in structures formed by third parties. The Company has no voting or other rights to direct the activities of the investments that would most significantly impact the entities' performance, and therefore is not considered the primary beneficiary and does not consolidate these entities.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2013
Deposits	'
Deposits	'
	Note 9—Deposits
	At December 31, 2013, the Company had $4.2 billion in interest bearing time deposits with a remaining term of greater than one year, of which $3.4 billion related to deposits of $100,000 and over. Maturity information for all interest bearing time deposits with a remaining term of greater than one year is summarized below.
	(Dollars in millions)	December 31,
		2013
	Due after one year through two years	$	1,023
	Due after two years through three years		1,291
	Due after three years through four years		998
	Due after four years through five years		794
	Due after five years		44
	Total	$	4,150

Commercial_Paper_and_Other_Sho

Commercial Paper and Other Short-Term Borrowings	12 Months Ended
	Dec. 31, 2013
Commercial Paper and Other Short-Term Borrowings	'
Commercial Paper and Other Short-Term Borrowings	'
	Note 10—Commercial Paper and Other Short-Term Borrowings
	The following is a summary of the Company's commercial paper and other short-term borrowings:
	(Dollars in millions)	December 31,			December 31,
		2013			2012
	Federal funds purchased and securities sold under repurchase agreements with weighted average interest rates of 0.07% and 0.96% at December 31, 2013 and December 31, 2012, respectively	$	39		$	123
	Commercial paper, with weighted average interest rates of 0.19% and 0.20% at December 31, 2013 and December 31, 2012, respectively		2,524			1,240
	Total commercial paper and other short-term borrowings	$	2,563		$	1,363
	Federal funds purchased and securities sold under repurchase agreements:
	Maximum outstanding at any month end	$	359		$	1,471
	Average balance during the year		263			441
	Weighted average interest rate during the year		0.12	%		0.21	%
	Commercial paper:
	Maximum outstanding at any month end	$	3,655		$	2,837
	Average balance during the year		2,393			1,981
	Weighted average interest rate during the year		0.18	%		0.27	%
	Other borrowed funds:
	Federal Home Loan Bank borrowings:
	Maximum outstanding at any month end	$	—		$	2,500
	Average balance during the year		—			739
	Weighted average interest rate during the year		—	%		0.27	%
	Term federal funds purchased:
	Maximum outstanding at any month end	$	269		$	270
	Average balance during the year		50			51
	Weighted average interest rate during the year		0.15	%		0.18	%
	All other borrowed funds:
	Maximum outstanding at any month end	$	—		$	36
	Average balance during the year		45			42
	Weighted average interest rate during the year		1.71	%		0.89	%
	In September 2008, the Company established a $500 million, three-year unsecured revolving credit facility with BTMU. This credit facility was renewed and expires in July 2016. For additional information regarding the Company's revolving credit facility with BTMU, see Note 22 to our Consolidated Financial Statements included in this Form 10-K.
	At December 31, 2013, federal funds purchased and securities sold under repurchase agreements had a weighted average remaining maturity of 2 days. The commercial paper outstanding had a weighted average remaining maturity of 76 days.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Long-Term Debt	'
Long-Term Debt	'
	Note 11—Long-Term Debt
	Long-term debt consists of borrowings having an original maturity of one year or more. The following is a summary of the Company's long-term debt:
	(Dollars in millions)	December 31,		December 31,
		2013		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		—		406
	Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 1.63% at December 31, 2013		300		—
	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 2.60% at December 31, 2013 and 2.66% at December 31, 2012		66		66
	Total debt issued by UnionBanCal Corporation		763		869
	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 February 2015 to February 2016. These notes bear a combined weighted-average rate of 2.55% at December 31, 2013 and 1.39% at December 31, 2012	$	800	$	2,100
	Fixed rate 2.125% notes due December 2013		—		399
	Floating rate notes due June 2014. These notes, which bear interest at 0.95% above 3-month LIBOR, had a rate of 1.19% at December 31, 2013 and 1.26% at December 31, 2012		300		300
	Fixed rate 3.00% notes due June 2016		699		699
	Fixed rate 1.50% notes due September 2016		499		—
	Floating rate notes due September 2016. These notes, which bear interest at 0.75% above 3-month LIBOR, had a rate of 1.00% at December 31, 2013		500		—
	Fixed rate 2.125% notes due June 2017		499		499
	Fixed rate 2.625% notes due September 2018		1,000		—
	Note payable:
	Fixed rate 6.03% notes due July 2014 (related to consolidated VIE)		4		6
	Subordinated debt:
	Fixed rate 5.95% notes due May 2016		718		729
	Subordinated debt due to BTMU:
	Floating rate subordinated debt due June 2023. This note, which bears interest at 1.2% above 3-month LIBOR, had a rate of 1.45% at December 31, 2013		750		—
	Capital lease obligations with a combined weighted average interest rate of 4.88% at December 31, 2013 and 4.72% at December 31, 2012(1)		15		21
	Total debt issued by Union Bank, N.A. and other subsidiaries		5,784		4,753
	Total long-term debt	$	6,547	$	5,622
	-1
	Long-term debt assumed through PCBC acquisition
	Senior Debt
	On September 26, 2013, the Bank issued $500 million in aggregate principal amount of Floating Rate Senior Bank Notes due 2016 (2016 Floating Rate Notes), $500 million in aggregate principal amount of 1.50 percent Senior Bank Notes due 2016 (2016 Fixed Rate Notes), and $1 billion in aggregate principal amount of 2.625 percent Senior Bank Notes due 2018 (2018 Fixed Rate Notes) together with the 2016 Floating Rate Notes and the 2016 Fixed Rate Notes (Senior Notes). The 2016 Floating Rate Notes were issued to purchasers at a price of 100 percent of their principal amount. The 2016 Fixed Rate Notes were issued to purchasers at a price of 99.746 percent of their principal amount. The 2018 Fixed Rate Notes were issued to purchasers at a price of 99.977 percent of their principal amount.
	The 2016 Floating Rate Notes will bear interest at a rate equal to three-month U.S. Dollar LIBOR plus 0.75 percent per annum and will mature on September 26, 2016. The 2016 Fixed Rate Notes will bear interest at a rate of 1.50 percent per annum and will mature on September 26, 2016. The 2018 Fixed Rate Notes will bear interest at a rate of 2.625 percent per annum and will mature on September 26, 2018. Interest payments are due on the 2016 Floating Rate Notes on March 26, June 26, September 26 and December 26 of each year, commencing on December 26, 2013. Interest payments are due on the 2016 Fixed Rate Notes and the 2018 Fixed Rate Notes on March 26 and September 26 of each year, commencing on March 26, 2014.
	The 2016 Floating Rate Notes are not redeemable at the option of the Bank prior to maturity. The Bank may redeem any of the 2016 Fixed Rate Notes, in whole or in part, on and after August 26, 2016 at a redemption price equal to 100 percent of the principal amount being redeemed plus interest accrued to, but excluding, the date of redemption upon not less than 30 nor more than 60 days' notice provided by the Bank to holders of the 2016 Fixed Rate Notes. The Bank may redeem any of the 2018 Fixed Rate Notes, in whole or in part, on and after August 26, 2018 at a redemption price equal to 100 percent of the principal amount being redeemed plus interest accrued to, but excluding, the date of redemption upon not less than 30 nor more than 60 days' notice provided by the Bank to holders of the 2018 Fixed Rate Notes. None of the Senior Notes are subject to repayment at the option of the holders prior to maturity.
	The net proceeds from the sale of the Senior Notes have been used by the Bank for general corporate purposes in the ordinary course of its banking business. The Senior Notes were issued as part of the Bank's $8 billion bank note program under which the Bank may issue, from time to time, senior unsecured debt obligations with maturities of more than one year from their respective dates of issue and subordinated debt obligations with maturities of five years or more from their respective dates of issue. After issuing the Senior Notes, there is $2.7 billion available for issuance under the program.
	On June 18, 2012, the Bank issued $500 million aggregate principal amount of 2.125 percent Senior Notes due 2017 (2017 Senior Notes). The 2017 Senior Notes were issued at a purchase price of 99.699 percent. The 2017 Senior Notes are not redeemable at the option of the Bank prior to maturity or subject to repayment at the option of the holders prior to maturity. The 2017 Senior Notes bear interest of 2.125 percent per annum payable semi-annually and mature on June 16, 2017. The net proceeds from the issuance of the 2017 Senior Notes are used by the Bank for general corporate purposes in the ordinary course of its banking business.
	On June 18, 2012, the Company issued $400 million in aggregate principal amount of its 3.50 percent Senior Notes due 2022 (2022 Senior Notes). The 2022 Senior Notes were issued at a purchase price of 99.20 percent. The 2022 Senior Notes bear interest at the rate of 3.50 percent per year payable semi-annually and mature on June 18, 2022. The Company may, at its option at any time, redeem the 2022 Senior Notes, in whole or in part, at a redemption price equal to the greater of (1) 100 percent of the principal amount of the 2022 Senior Notes to be redeemed, and (2) the sum of the present values of the remaining scheduled payments of principal and interest in respect of the 2022 Senior Notes to be redeemed, discounted to the date of redemption on a semi-annual basis at a certain treasury rate plus 30 basis points, plus accrued interest to the date of redemption. The 2022 Senior Notes are senior unsecured obligations of the Company and rank senior to all of its existing and future subordinated debt and rank equally in right of payment with all of its existing and future unsecured and unsubordinated debt. However, the 2022 Senior Notes are structurally subordinated to all indebtedness of the Company's subsidiaries, including the Bank and its Senior Notes.
	The Bank borrows periodically from the Federal Home Loan Bank of San Francisco (FHLB) on a medium-term basis. The advances are secured by certain of the Bank's assets and bear either a fixed or a floating interest rate. The floating rates are tied to the three-month LIBOR plus a spread, reset every 90 days. At December 31, 2013, the $800 million in FHLB advances had a weighted average remaining maturity of approximately 22 months. As of December 31, 2013 and 2012, the Bank had pledged loans and securities of $50.8 billion and $44.5 billion, respectively, as collateral for short- and medium-term advances from the Federal Reserve Bank and FHLB.
	Junior subordinated debt payable to trusts
	The junior subordinated debt payable to trusts was assumed from our PCBC acquisition. These trusts were formed for the sole purpose of issuing preferred securities to third party investors. The proceeds from issuing the preferred securities were used by the trusts to purchase junior subordinated debt issued by PCBC prior to the acquisition. The junior subordinated debt qualifies as Tier 1 risk-based capital under Federal Reserve guidelines.
	Subordinated Debt due to BTMU
	On June 28, 2013, the Bank borrowed $750 million from BTMU under a subordinated debt agreement. The subordinated debt bears interest at a rate of three-month LIBOR plus 1.2 percent, payable quarterly, and will mature on June 28, 2023. The terms and conditions of the agreement are equivalent to those which would apply in a similar transaction with a non-related party. The Bank may prepay the subordinated debt prior to the stated maturity in whole or in part on or after June 28, 2018, but only if the Bank obtains prior written approval of the Office of the Comptroller of the Currency (OCC). The subordinated debt due to BTMU is a junior obligation to the Bank's existing and future outstanding senior indebtedness, and qualifies as Tier 2 capital under the federal banking agency risk-based capital guidelines.
	On December 27, 2013, the Company borrowed $300 million from BTMU under a subordinated debt agreement. The subordinated debt bears interest equal to a per annum rate of three-month LIBOR plus 1.38 percent, payable quarterly, and matures on December 27, 2023. The terms and conditions of the agreement are equivalent to those which would apply in a similar transaction with a non-related party. The Company may prepay the subordinated debt prior to the stated maturity date in whole or in part on or after December 27, 2018 but only if the Company obtains the prior written approval of the Federal Reserve. The subordinated debt due to BTMU is a junior obligation of the Company's existing and future outstanding senior indebtedness, and qualifies as Tier 2 capital under the federal banking agency risk-based capital guidelines.

Fair_Value_Measurement_and_Fai

Fair Value Measurement and Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2013
Fair Value Measurement and Fair Value of Financial Instruments	'
Fair Value Measurement and Fair Value of Financial Instruments	'
	Note 12—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 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 own creditworthiness in determining the fair value of its trading liabilities.
	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.
	Level 1:    Valuations are based on quoted prices in active markets for identical assets or liabilities. Since the valuations are based on quoted prices that are readily available in an active market, they do not entail a significant degree of judgment.
	Level 2:    Valuations are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuations for which all significant assumptions are observable or can be corroborated by observable market data.
	Level 3:    Valuations are based on at least one significant unobservable input that is supported by little or no market activity and is significant to the fair value measurement. Values are determined using pricing models and discounted cash flow models that include management judgment and estimation, which may be significant.
	In assigning the appropriate levels, the Company performs a detailed analysis of the assets and liabilities that are measured at fair value. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. The level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement in its entirety. Therefore, an item may be classified in Level 3 even though there may be many significant inputs that are readily observable.
	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 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 compares pricing sources, tests data variance within certain thresholds and performs variance analysis, utilizing third party valuations and both internal and external models. Results are formally reported on a quarterly basis to the VC.
	A description of the valuation methodologies used for certain financial assets and liabilities measured at fair value is as follows:
	Recurring Fair Value Measurements:
	Trading Account Assets:    Trading account assets are recorded at fair value and primarily consist of securities and derivatives held for trading purposes. See discussion below on securities available for sale, which utilize the same valuation methodology as trading account securities. See also discussion below on derivatives valuation.
	Securities Available for Sale:    Securities available for sale are recorded at fair value based on readily available quoted market prices, if available. These securities are classified as Level 1 and include exchange traded equities. If such quoted market prices are not available, management utilizes third-party pricing services and broker quotations from dealers in the specific instruments. These securities are classified as Level 2 and include U.S. government-sponsored agencies, residential mortgage-backed securities and CMBS, CLOs, and certain other debt securities. If no market prices or broker quotes are available, internal pricing models are used. To the extent possible, these pricing model valuations utilize observable market inputs obtained for similar securities. Typical inputs include LIBOR and U.S. Treasury yield curves, benchmark yields, consensus prepayment estimates and credit spreads. When pricing model valuations use significant unobservable inputs, the securities are classified as Level 3. These other debt securities primarily include direct bank purchase bonds. The valuation of these securities are based upon a return on equity method, which incorporates a market-required return on capital, probability of default and loss severity.
	Other assets:    Other assets include interest rate hedging contracts and other risk management derivatives; see discussion below on derivatives.
	Derivatives:    The Company's derivatives are primarily traded in over-the-counter markets where quoted market prices are not readily available. The Company values its derivatives using pricing models that are widely accepted in the financial services industry with inputs that are observable in the market or can be derived from or corroborated by observable market data. These models reflect the contractual terms of the derivatives including the period to maturity and market observable inputs such as yield curves and option volatility. Valuation adjustments are made to reflect counterparty credit quality and to consider the creditworthiness of the Company. These derivatives, which are included in trading account assets, trading account liabilities, other assets and other liabilities are generally classified as Level 2. Trading account assets and trading account liabilities include Level 3 derivatives comprised of embedded derivatives contained in market-linked CDs and perfectly matched over-the-counter options, whose fair value is obtained through unadjusted third party broker quotes, which incorporate significant unobservable inputs.
	Trading Account Liabilities:    Trading account liabilities are recorded at fair value and primarily consist of securities sold, not yet purchased and derivatives. See discussion above on derivatives valuation. Securities sold, not yet purchased consist of U.S. Government securities and are classified as Level 2, which utilize the same valuation methodology as trading account securities.
	Other Liabilities:    The fair value of the Company's FDIC clawback liability is determined using a discounted cash flow model with significant unobservable inputs, which include probability of default and loss severity. The FDIC clawback liability is classified as Level 3.
	Nonrecurring Fair Value Measurements:
	Individually Impaired Loans:    Individually impaired loans are valued at the time the loan is identified as impaired based on the present value of the remaining expected cash flows. Because the discount factor applied is based on the loan's original effective yield rather than a current market rate, that present value does not represent fair value. However, as a practical expedient, an impaired loan may be measured based on a loan's observable market price or the underlying collateral securing the loan (provided the loan is collateral dependent), which does approximate fair value. Collateral may be real estate or business assets, including equipment. The value of collateral is determined based on independent appraisals. Appraised values may be adjusted based on management's historical knowledge, changes in market conditions from the time of valuation, and management's knowledge of the client and the client's business. The loan's market price is determined using market pricing for similar assets, adjusted for management judgment. Impaired loans are reviewed and evaluated at least quarterly for additional impairment and adjusted accordingly. Impaired loans that are adjusted to fair value based on underlying collateral or the loan's market price are classified as Level 3.
	Loans Held for Sale:    Residential mortgage and commercial loans held for sale are recorded at the lower of cost or fair value. The fair value of fixed-rate residential loans is based on whole loan forward prices obtained from GSEs. These loans are classified as Level 2. The fair value of commercial loans held for sale may be based on secondary market offerings for loans with similar characteristics or a valuation methodology utilizing the appraised value to outstanding loan balance ratio. These loan values are classified as Level 3.
	Private Equity Investments:    Private equity investments are recorded either at cost or using the equity method and are evaluated for impairment. The valuation of these investments requires significant management judgment due to the absence of quoted market prices, lack of liquidity and the long-term nature of these assets. When required, the fair value of the investments was estimated using the NAV of the fund or based on the investee's business model, current and projected financial performance, liquidity and overall economic and market conditions. Private equity investments are generally classified as Level 3.
	OREO:    OREO represents collateral acquired through foreclosure and is initially recorded at fair value as established by a current appraisal, adjusted for disposition costs. Subsequently, OREO is measured at lower of cost or fair value. OREO values are reviewed on an ongoing basis and any subsequent decline in fair value is recorded as a foreclosed asset expense in the current period. The value of OREO is determined based on independent appraisals and is generally classified as Level 3.
	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 December 31, 2013 and 2012, by major category and by valuation hierarchy level.
		December 31, 2013
	(Dollars in millions)	Level 1			Level 2			Level 3			Netting			Fair Value
											Adjustment(1)
	Assets
	Trading account assets:
	U.S. Treasury	$	—		$	8		$	—		$	—		$	8
	U.S. government-sponsored agencies		—			116			—			—			116
	State and municipal		—			5			—			—			5
	Other loans		—			140			—			—			140
	Interest rate derivative contracts		1			705			7			(212	)		501
	Commodity derivative contracts		—			67			9			(66	)		10
	Foreign exchange derivative contracts		1			30			2			(18	)		15
	Equity derivative contracts		—			—			253			(197	)		56
	Total trading account assets		2			1,071			271			(493	)		851
	Securities available for sale:
	U.S. government-sponsored agencies		—			73			—			—			73
	Residential mortgage-backed securities:
	U.S. government and government-sponsored agencies		—			8,900			—			—			8,900
	Privately issued		—			222			—			—			222
	Commercial mortgage-backed securities		—			1,870			—			—			1,870
	Collateralized loan obligations		—			2,673			—			—			2,673
	Asset-backed and other		—			35			—			—			35
	Other debt securities:
	Direct bank purchase bonds		—			—			1,960			—			1,960
	Other		—			18			58			—			76
	Equity securities		8			—			—			—			8
	Total securities available for sale		8			13,791			2,018			—			15,817
	Other assets:
	Interest rate hedging contracts		—			8			—			—			8
	Other derivative contracts		—			1			1			—			2
	Total other assets		—			9			1			—			10
	Total assets	$	10		$	14,871		$	2,290		$	(493	)	$	16,678
	Percentage of Total		—	%		89	%		14	%		(3	)%		100	%
	Percentage of Total Company Assets		—	%		14	%		2	%		—	%		16	%
	Liabilities
	Trading account liabilities:
Interest rate derivative contracts	$	3		$	606		$	—		$	(379	)	$	230
Commodity derivative contracts		—			53			8			(33	)		28
Foreign exchange derivative contracts		1			26			2			(11	)		18
Equity derivative contracts		—			—			254			—			254
Securities sold, not yet purchased		—			10			—			—			10
Total trading account liabilities		4			695			264			(423	)		540
Other liabilities:
FDIC clawback liability		—			—			96			—			96
Interest rate hedging contracts		—			13			—			—			13
Other derivative contracts		—			1			3			—			4
Total other liabilities		—			14			99			—			113
Total liabilities	$	4		$	709		$	363		$	(423	)	$	653
Percentage of Total		1	%		109	%		55	%		(65	)%		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			Fair Value
										Adjustment(1)
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. 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
Collateralized loan obligations		—			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 years ended December 31, 2013 and 2012. Level 3 available for sale securities at December 31, 2013 primarily consist 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 Years Ended
	December 31, 2013															December 31, 2012
(Dollars in millions)	Trading			Securities			Other			Trading			Other			Trading			Securities			Trading			Other
	Assets			Available for			Assets			Liabilities			Liabilities			Assets			Available for			Liabilities			Liabilities
				Sale															Sale
Asset (liability) balance, beginning of period	$	136		$	1,499		$	—		$	(136	)	$	(95	)	$	—		$	48		$	—		$	(51	)
Total gains (losses) (realized/unrealized):
Included in income before taxes		119			—			—			(120	)		(4	)		(18	)		—			18			(41	)
Included in other comprehensive income		—			28			—			—			—			—			(35	)		—			—
Purchases/additions		24			700			1			—			—			8			1,619			—			(3	)
Sales		—			(14	)		—			(16	)		—			—			—			(8	)		—
Settlements		(8	)		(195	)		—			8			—			(7	)		(133	)		7			—
Transfers into Level 3		—			—			—			—			—			153			—			(153	)		—
Asset (liability) balance, end of period	$	271		$	2,018		$	1		$	(264	)	$	(99	)	$	136		$	1,499		$	(136	)	$	(95	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	119		$	—		$	—		$	(120	)	$	(4	)	$	(18	)	$	—		$	18		$	(41	)
The following table presents information about significant unobservable inputs related to the Company's significant Level 3 assets and liabilities at December 31, 2013.
	December 31, 2013
(Dollars in millions)	Level 3			Valuation Technique(s)		Significant Unobservable		Range of Inputs			Weighted
	Fair Value					Input(s)					Average
Securities available for sale:
Direct bank purchase bonds	$	1,960		Return on equity		Market-required return on capital			8.0 - 10.0	%		9.7	%
						Probability of default			0.0 - 25.0	%		0.6	%
						Loss severity			10.0 - 75.0	%		32.8	%
Other liabilities:
FDIC clawback liability	$	96		Discounted cash flow		Probability of default			0.1 - 100.0	%		60.4	%
						Loss severity			0.0 - 100.0	%		39.5	%
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 years ended December 31, 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.
	December 31, 2013
													Loss for the
													Year Ended
													December 31,
(Dollars in millions)	Fair			Level 1			Level 2			Level 3			2013
	Value
Loans:
Impaired loans	$	59		$	—		$	—		$	59		$	(47	)
Other assets:
OREO		21			—			—			21			(11	)
Private equity investments		—			—			—			—			(5	)
Total	$	80		$	—		$	—		$	80		$	(63	)
	December 31, 2012
													Loss for the
													Year Ended
													December 31,
(Dollars in millions)	Fair			Level 1			Level 2			Level 3			2012
	Value
Loans:
Impaired loans	$	119		$	—		$	—		$	119		$	(88	)
Other assets:
OREO		53			—			—			53			(27	)
Private equity investments		—			—			—			—			(2	)
Total	$	172		$	—		$	—		$	172		$	(117	)
Loans include individually impaired loans that are measured based on the fair value of the underlying collateral or the fair value of the loan. The fair value of impaired loans was determined 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
In addition to financial instruments recorded at fair value in the Company's financial statements, the disclosure of the estimated fair value of financial instruments that are not carried at fair value is also required. Excluded from this disclosure requirement are lease financing arrangements, investments accounted for under the equity method, employee pension and other postretirement obligations and all nonfinancial assets and liabilities, including goodwill and other intangible assets such as long-term customer relationships. The fair values presented are estimates for certain individual financial instruments and do not represent an estimate of the fair value of the Company as a whole.
Certain financial instruments that are not recognized at fair value on the consolidated balance sheet are carried at amounts that approximate fair value due to their short-term nature. These financial instruments include cash and due from banks, interest bearing deposits in banks, federal funds sold and purchased, securities purchased under resale agreements, securities sold under repurchase agreements and commercial paper. In addition, the fair value of deposits with no stated maturity, such as noninterest bearing demand deposits, interest bearing checking, and market rate and other savings are deemed to equal their carrying amounts.
Financial instruments for which their carrying amounts do not approximate fair value include securities held to maturity, loans, FDIC indemnification asset, interest bearing deposits with stated maturities, certain other short-term borrowings, long-term debt and off-balance sheet instruments.
Securities held to maturity:    The fair value of U.S. government agency and government-sponsored agencies residential mortgage backed securities, CMBS and CLOs classified as held to maturity are based on unadjusted third party pricing service prices.
Loans:    The fair value of purchased credit-impaired loans was estimated using a discounted cash flow methodology that considered factors including the type of loan and related collateral, risk classification, term of loan, performance status and current discount rates. The fair values of mortgage loans were estimated based on quoted market prices for loans with similar credit and interest rate risk characteristics. The fair values of other loans were estimated based upon the type of loan and maturity and were determined by discounting the future expected cash flows using the current origination rates for similar loans made to borrowers with similar credit ratings and include adjustments for liquidity premiums.
FDIC indemnification asset:    The fair value of the FDIC indemnification asset was estimated using the present value of the cash flows that the Company expects to collect from the FDIC under the loss share agreements.
Interest bearing deposits:    The fair values of savings accounts and certain money market accounts were based on the amounts payable on demand at the reporting date. The fair value of fixed maturity certificates of deposit was estimated using a discounted cash flow calculation that applies current interest rates being offered on certificates with similar maturities.
Commercial paper and other short-term borrowings:    The fair values of Federal Reserve Bank term borrowings, FHLB borrowings and term federal funds purchased were estimated using a discounted cash flow calculation that applies current market rates for applicable maturities. The carrying amounts of other short-term borrowed funds were assumed to approximate their fair value due to their limited duration.
Long-term debt:    The fair value of senior and subordinated debt was estimated using either a discounted cash flow analysis based on current market interest rates for debt with similar maturities and credit quality or estimated using market quotes. The fair value of junior subordinated debt payable to trusts was estimated using market quotes of similar securities.
Off-balance sheet instruments:    Commitments to extend credit and issued standby and commercial letters of credit are instruments that generate ongoing fees, which are recognized over the term of the commitment period. In situations where the credit quality of the counterparty to a commitment has declined, the Company records a reserve. A reasonable estimate of the fair value of these instruments is the carrying amount of deferred fees plus the related reserve.
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 December 31, 2013 and 2012.
	December 31, 2013
(Dollars in millions)	Carrying			Fair			Level 1			Level 2			Level 3
	Amount			Value
Assets
Cash and cash equivalents	$	6,203		$	6,203		$	6,203		$	—		$	—
Securities held to maturity		6,509			6,439			—			6,439			—
Loans held for investment, net of allowance for loan losses(1)		66,898			68,132			—			—			68,132
FDIC indemnification asset		141			95			—			—			95
Other assets		3			3			—			—			3
Liabilities
Deposits	$	80,101		$	80,228		$	—		$	80,228		$	—
Commercial paper and other short-term borrowings		2,563			2,563			—			2,563			—
Long-term debt		6,547			6,709			—			6,709			—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	273		$	273		$	—		$	—		$	273
-1
Excludes lease financing, net of related allowance.
	December 31, 2012
(Dollars in millions)	Carrying			Fair			Level 1			Level 2			Level 3
	Amount			Value
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	$	74,304		$	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.

Derivative_Instruments_and_Oth

Derivative Instruments and Other Financial Instruments Used For Hedging	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Other Financial Instruments Used For Hedging	'
Derivative Instruments and Other Financial Instruments Used For Hedging	'
	Note 13—Derivative Instruments and Other Financial Instruments Used For Hedging
	The Company enters into certain derivative and other financial instruments primarily to assist customers with their risk management objectives and to manage the Company's exposure to interest rate risk. When entering into derivatives on behalf of customers the Company generally acts as a financial intermediary by offsetting a significant portion of the market risk for these derivatives with third parties. The Company may also enter into derivatives for other risk management purposes and, subject to certain limits, may take market risk when buying and selling derivatives for its own account. All derivative instruments are recognized as assets or liabilities on the consolidated balance sheets at fair value.
	Counterparty credit risk is inherent in derivative instruments. In order to reduce its exposure to counterparty credit risk, the Company utilizes credit approvals, limits, monitoring procedures and master netting and collateral support annex (CSA) agreements. Additionally, the Company considers the potential loss in the event of counterparty default in estimating the fair value amount of the derivative instrument.
	The table below presents the notional amounts and fair value amounts of the Company's derivative instruments reported on the consolidated balance sheets, segregated between derivative instruments designated and qualifying as hedging instruments and derivative instruments not designated and qualifying as hedging instruments as of December 31, 2013 and 2012, respectively. Asset and liability values are presented gross, excluding the impact of legally enforceable master netting and CSA agreements. The fair value of asset and liability derivatives designated and qualifying as hedging instruments and derivatives designated as other risk management are included in other assets and other liabilities, respectively. The fair value of asset and liability trading derivatives are included in trading account assets and trading account liabilities, respectively.
		December 31, 2013							December 31, 2012
				Fair Value								Fair Value
	(Dollars in millions)	Notional		Asset		Liability			Notional			Asset			Liability
		Amount		Derivatives		Derivatives			Amount			Derivatives			Derivatives
	Cash flow hedges
	Interest rate contracts	$	4,300	$	8	$	13		$	8,400		$	28		$	—	-1
	Not designated and qualifying as hedging instruments:
	Trading
	Interest rate contracts		44,427		713		609			37,790			1,075			1,009
	Commodity contracts		5,714		76		61			5,595			167			140
	Foreign exchange contracts		5,645		33		29			4,593			69			65
	Equity contracts		4,027		253		254			3,631			103			103
	Other contracts		140		—		—			—			—			—
	Total Trading		59,953		1,075		953			51,609			1,414			1,317
	Other risk management		185		2		4			109			1			3
	Total derivative instruments	$	64,438	$	1,085	$	970		$	60,118		$	1,443		$	1,320
	-1
	Amount recongized was less than $1 million.
	We recognized net losses of $6 million and $7 million on other risk management derivatives for the years ended December 31, 2013 and 2012, respectively, which are included in other noninterest income.
	Derivatives Designated and Qualifying as Hedging Instruments
	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. During the years ended December 31, 2013 and 2012 the Company did not have fair value hedges.
	Cash Flow Hedges
	The Company used interest rate swaps with a notional amount of $4.3 billion at December 31, 2013 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed loans. To the extent effective, payments received (or paid) under the swap contract offset fluctuations in interest income on loans caused by changes in the relevant LIBOR index. At December 31, 2013, the weighted average remaining life of the active cash flow hedges was approximately 4.02 years.
	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 December 31, 2013, the Company expects to reclassify approximately $69 million of income from accumulated other comprehensive income to net interest income during the year ending December 31, 2014. This amount could differ from amounts actually realized due to changes in interest rates, hedge terminations and the addition of other hedges subsequent to December 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 years ended December 31, 2013 and 2012:
		Amount of Gain (Loss)				Gain (Loss) Reclassified from								Gain (Loss) Recognized in Income
		Recognized in OCI on				Accumulated OCI								on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing)
		Derivative Instruments				into Income (Effective Portion)
		(Effective Portion)
		For the Years Ended						For the Years Ended								For the Years Ended
		December 31,						December 31,								December 31,
	(Dollars in millions)	2013		2012		Location		2013			2012			Location		2013		2012
	Derivatives in cash flow hedging relationships
						Interest income		$	44		$	17
	Interest rate contracts	$	29	$	82	Interest expense			(1	)		(2	)	Noninterest expense(1)		$	—	$	—
	Total	$	29	$	82			$	43		$	15				$	—	$	—
	-1
	Amount recognized was less than $1 million.
	Derivatives Not Designated and Qualifying as Hedging Instruments
	Trading Derivatives
	Derivative instruments classified as trading include both derivatives entered into as an accommodation for customers and, subject to certain limits, for the Company's own account. 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 statements of income under the heading trading account activities for derivative instruments classified as trading for the twelve months ended December 31, 2013 and 2012:
		Gain (Loss) Recognized in Income on
		Derivative Instruments
		For the Years Ended
	(Dollars in millions)	December 31, 2013		December 31, 2012
	Trading derivatives:
	Interest rate contracts	$	30	$	56
	Equity contracts		—		14
	Foreign exchange contracts		18		22
	Commodity contracts		2		5
	Total	$	50	$	97
	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 December 31, 2013 and 2012:
		December 31, 2013
									Gross Amounts Not Offset in
									Balance Sheet
(Dollars in millions)	Gross Amounts		Gross Amounts		Net Amounts			Financial			Cash Collateral			Net Amount
	of Recognized		Offset in		Presented in			Instruments			Received/Pledged
	Assets/Liabilities		Balance Sheet		Balance Sheet
Financial Assets:
Derivative assets	$	1,085	$	493	$	592		$	79		$	—		$	513
Securities purchased under resale agreements		10		—		10			10			—			—
Total	$	1,095	$	493	$	602		$	89		$	—		$	513
Financial Liabilities:
Derivative liabilities	$	970	$	423	$	547		$	144		$	—		$	403
Securities sold under repurchase agreements		8		—		8			8			—			—
Total	$	978	$	423	$	555		$	152		$	—		$	403
	December 31, 2012
								Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts		Gross Amounts		Net Amounts			Financial			Cash Collateral			Net Amount
	of Recognized		Offset in		Presented in			Instruments			Received/Pledged
	Assets/Liabilities		Balance Sheet		Balance Sheet
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

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Loss	'
Accumulated Other Comprehensive Loss	'
	Note 14—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			Net of
		Tax			Effect			Tax
		Amount
	For the Year Ended December 31, 2011:
	Cash flow hedge activities:
	Unrealized net gains (losses) on hedges arising during the period	$	(5	)	$	2		$	(3	)
	Less: Reclassification adjustment for net (gains) losses on hedges included in net income		11			(4	)		7
	Net change		6			(2	)		4
	Securities:
	Unrealized holding gains (losses) arising during the period on securities available for sale		204			(80	)		124
	Reclassification adjustment for net (gains) losses on securities available for sale included in net income		(58	)		23			(35	)
	Less: accretion of fair value adjustment on securities available for sale		(5	)		2			(3	)
	Less: accretion of fair value adjustment on held to maturity securities		(29	)		11			(18	)
	Less: amortization of net unrealized (gains) losses on held to maturity securities		104			(41	)		63
	Net change		216			(85	)		131
	Foreign currency translation adjustment		(1	)		—			(1	)
	Pension and other benefits:
	Amortization of transition amount		1			—			1
	Recognized net actuarial gain (loss)(1)		51			(20	)		31
	Pension and other benefits arising during the year		(491	)		193			(298	)
	Net change(1)		(439	)		173			(266	)
	Net change in accumulated other comprehensive loss	$	(218	)	$	86		$	(132	)
	For the Year Ended December 31, 2012:
	Cash flow hedge activities:
	Unrealized net gains (losses) on hedges arising during the period	$	82		$	(32	)	$	50
	Less: Reclassification adjustment for net (gains) losses on hedges included in net income		(15	)		6			(9	)
	Net change		67			(26	)		41
	Securities:
	Unrealized holding gains (losses) arising during the period on securities available for sale		187			(74	)		113
	Reclassification adjustment for net (gains) losses on securities available for sale included in net income		(107	)		42			(65	)
	Reclassification of unrealized (gains) losses on held to maturity securities transferred to securities available for sale		301			(118	)		183
	Less: accretion of fair value adjustment on securities available for sale		(9	)		4			(5	)
	Less: accretion of fair value adjustment on held to maturity securities		(24	)		9			(15	)
	Less: amortization of net unrealized (gains) losses on held to maturity securities		90			(35	)		55
	Net change		438			(172	)		266
	Foreign currency translation adjustment		2			(1	)		1
	Pension and other benefits:
	Amortization of transition amount		1			(1	)		—
	Recognized net actuarial gain (loss)(1)		99			(39	)		60
	Pension and other benefits arising during the year		(121	)		48			(73	)
	Net change(1)		(21	)		8			(13	)
	Net change in accumulated other comprehensive loss	$	486		$	(191	)	$	295
	For the Year Ended December 31, 2013:
	Cash flow hedge activities:
	Unrealized net gains (losses) on hedges arising during the period	$	29		$	(11	)	$	18
	Less: Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt		(43	)		17			(26	)
	Net change		(14	)		6			(8	)
	Securities:
	Unrealized holding gains (losses) arising during the period on securities available for sale		(401	)		157			(244	)
	Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net		(178	)		70			(108	)
	Less: accretion of fair value adjustment on securities available for sale		(75	)		30			(45	)
	Less: accretion of fair value adjustment on held to maturity securities		(12	)		5			(7	)
	Less: amortization of net unrealized (gains) losses on held to maturity securities		(137	)		54			(83	)
	Net change		(803	)		316			(487	)
	Foreign currency translation adjustment		(7	)		3			(4	)
	Pension and other benefits:
	Recognized net actuarial gain (loss)(1)		116			(46	)		70
	Pension and other benefits arising during the year		526			(207	)		319
	Net change(1)		642			(253	)		389
	Net change in accumulated other comprehensive loss	$	(182	)	$	72		$	(110	)
	-1
These amounts are included in the computation of net periodic pension cost. For further information, see Note 16 to these consolidated financial statements.
The following table presents the change in accumulated other comprehensive loss balances.
(Dollars in millions)	Net			Net			Foreign			Pension and			Accumulated
	Unrealized			Unrealized			Currency			Other			Other
	Gains (Losses)			Gains (Losses)			Translation			Benefits			Comprehensive
	on Cash			on Securities			Adjustment			Adjustment			Loss
	Flow
	Hedges
Balance, December 31, 2010	$	(21	)	$	(238	)	$	1		$	(419	)	$	(677	)
Other comprehensive income before reclassifications		(3	)		166			(1	)		—			162
Amounts reclassified from accumulated other comprehensive loss		7			(35	)		—			(266	)		(294	)
Balance, December 31, 2011	$	(17	)	$	(107	)	$	—		$	(685	)	$	(809	)
Balance, December 31, 2011	$	(17	)	$	(107	)	$	—		$	(685	)	$	(809	)
Other comprehensive income before reclassifications		50			148			1			—			199
Amounts reclassified from accumulated other comprehensive loss		(9	)		118			—			(13	)		96
Balance, December 31, 2012	$	24		$	159		$	1		$	(698	)	$	(514	)
Balance, December 31, 2012	$	24		$	159		$	1		$	(698	)	$	(514	)
Other comprehensive income before reclassifications		18			(379	)		(4	)		—			(365	)
Amounts reclassified from accumulated other comprehensive loss		(26	)		(108	)		—			389			255
Balance, December 31, 2013	$	16		$	(328	)	$	(3	)	$	(309	)	$	(624	)

Management_Stock_Plans

Management Stock Plans	12 Months Ended
	Dec. 31, 2013
Management Stock Plans	'
Management Stock Plans	'
	Note 15—Management Stock Plans
	UnionBanCal Corporation Stock Bonus Plan (Stock Bonus Plan)
	Effective as of April 27, 2010, the Company adopted the Stock Bonus Plan. Under the Stock Bonus Plan, the Company grants restricted stock units settled in ADRs representing shares of common stock of the Company's indirect parent company, MUFG, to key employees at the discretion of the Executive Compensation and Benefits Committee of the Board of Directors (the Committee). The Committee determines the number of shares, vesting requirements and other features and conditions of the restricted stock units. Under the Stock Bonus Plan, MUFG ADRs are purchased in the open market upon the vesting of the restricted stock units, through a revocable trust. There is no amount authorized to be issued under the Plan since all shares are purchased in the open market. These awards generally vest pro-rata on each anniversary of the grant date and become fully vested three years from the grant date, provided that the employee has completed the specified continuous service requirement. Generally, the grants vest earlier if the employee dies, is permanently and totally disabled, retires under certain grant, age and service conditions, or terminates employment under certain conditions.
	Under the Stock Bonus Plan, the restricted stock unit participants do not have dividend rights, voting rights or other stockholder rights. The grant date fair value of these awards is equal to the closing price of the MUFG ADRs on date of grant.
	The following table is a summary of the Stock Bonus Plan:
	Grant Date	Units			Fair Value			Vesting		Pro-rata
		Granted			of Stock			Duration		Vesting Date
	April 15, 2011		4,754,105			4.69		3 years		April 15
	July 15, 2011		180,740			4.94		3 years		July 15
	April 15, 2012		4,816,795			4.78		3 years		April 15
	July 15, 2012		74,175			4.72		3 years		July 15
	April 15, 2013		3,656,340			6.66		3 years		April 15
	July 15, 2013		78,725			6.67		3 years		July 15
	The following table is a rollforward of the restricted stock units under the Stock Bonus Plan for the years ended December 31, 2013 and 2012.
		Restricted Stock Units
		2013			2012
	Units outstanding, beginning of year		8,857,884			7,138,334
	Activity during the year:
	Granted		3,735,065			4,890,970
	Vested		(4,325,661	)		(2,920,392	)
	Forfeited		(416,271	)		(251,028	)
	Units outstanding, end of year		7,851,017			8,857,884
	The following table is a summary of the Company's compensation costs, the corresponding tax benefit, and unrecognized compensation costs:
		Years Ended
		December 31,
	(Dollars in millions)	2013			2012			2011
	Compensation costs	$	21		$	18		$	15
	Tax benefit		8			7			6
	Unrecognized compensation costs		27			26			22

Employee_Pension_and_Other_Pos

Employee Pension and Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2013
Employee Pension and Other Postretirement Benefits	'
Employee Pension and Other Postretirement Benefits	'
	Note 16—Employee Pension and Other Postretirement Benefits
	Retirement Plan
	The Company maintains the Union Bank Retirement Plan (the Pension Plan), which is a noncontributory qualified defined benefit pension plan covering substantially all of the domestic employees of the Company. The Pension Plan provides retirement benefits based on years of credited service and the final average compensation amount, as defined in the Pension Plan. Employees become eligible for the Pension Plan after one year of service and become fully vested after five years of service. Effective October 1, 2012, the Company established a new cash balance plan formula for all future eligible employees. Participants receive annual pay credits based on eligible pay multiplied by a percentage determined by their age and years of service. Participants also receive an annual interest credit. Employees become vested upon completing three years of vesting service. The Company's funding policy is to make contributions between the minimum required and the maximum deductible amount as allowed by the Internal Revenue Code. Contributions are intended to provide not only for benefits attributed to services to date, but also for those expected to be earned in the future.
	Other Postretirement Benefits
	General
	The Company maintains the Union Bank Employee Health Benefit Plan, which is a qualified plan and in part provides certain healthcare benefits for its retired employees and life insurance benefits for those employees who retired prior to January 1, 2001, which together are presented as "Other Benefits Plan." The healthcare cost is shared between the Company and the retiree. The life insurance plan is noncontributory. The accounting for the Other Benefits Plan anticipates future cost-sharing changes that are consistent with the Company's intent to maintain a level of cost-sharing at approximately 25 to 50 percent, depending on the retiree's age and length of service with the Company. Assets set aside to cover such obligations are primarily invested in mutual funds and insurance contracts.
	The following table sets forth the fair value of the assets in the Company's Pension Plan and Other Benefits Plan as of December 31, 2013 and 2012.
		Pension Plan						Other Benefits
								Plan
		Years Ended						Years Ended
		December 31,						December 31,
	(Dollars in millions)	2013			2012			2013			2012
	Change in plan assets:
	Fair value of plan assets, beginning of year	$	2,019		$	1,757		$	210		$	172
	Actual return on plan assets		391			254			37			23
	Acquisition		—			—			—			16
	Employer contributions		380			150			12			13
	Plan participants' contributions		—			—			7			6
	Benefits paid		(74	)		(142	)		(21	)		(20	)
	Fair value of plan assets, end of year	$	2,716		$	2,019		$	245		$	210
	The investment objective for the Company's Pension Plan and Other Benefits Plan, collectively the Plans, is to maximize total return within reasonable and prudent levels of risk. The Plans' asset allocation strategy is the principal determinant in achieving expected investment returns on the Plans' assets. The Pension Plan asset allocation strategy favors equities, with a target allocation of 63 percent in equity securities, 25 percent in debt securities, and 12 percent in real estate investments. Similarly, the Other Benefits Plan asset allocation strategy favors equities with a target allocation of 70 percent in equity securities and 30 percent in debt securities. Additionally, the Other Benefits Plan holds an investment in an insurance contract with Hartford Life that is separate from the target allocation. Actual asset allocations may fluctuate within acceptable ranges due to market value variability. If market fluctuations cause an asset class to fall outside of its strategic asset allocation range, the portfolio will be re-balanced as appropriate. A core equity position of domestic large cap and small cap stocks will be maintained, in conjunction with a diversified portfolio of international equities and fixed income securities. Plan asset performance is compared against established indices and peer groups to evaluate whether the risk associated with the portfolio is appropriate for the level of return.
	The Company periodically reviews the Plans' strategic asset allocation policy and the expected long-term rate of return for plan assets. The investment return volatility of different asset classes and the liability structure of the plans are evaluated to determine whether adjustments are required to the Plans' strategic asset allocation policy, taking into account the principles established in the Company's funding policy. Management periodically reviews and adjusts the long-term rate of return on assets assumption for the Plans based on the expected long-term rate of return for the asset classes and their weightings in the Plans' strategic asset allocation policy and taking into account the prevailing economic and regulatory climate and practices of other companies both within and outside our industry.
	The following table provides the fair value by level within the fair value hierarchy of the Company's period-end assets by major asset category for the Pension Plan and Other Benefits Plan. For information about the fair value hierarchy levels, refer to Note 12 to these consolidated financial statements. The Plans do not hold any equity or debt securities issued by the Company or any related parties.
		December 31, 2013
	(Dollars in millions)	Level 1			Level 2			Level 3			Total
	Pension Plan Investments:
	Cash and cash equivalents	$	—		$	28		$	—		$	28
	U.S. Government securities		—			230			—			230
	Corporate bonds		—			364			—			364
	Equity securities		233			—			—			233
	Real estate funds		—			—			242			242
	Limited partnerships		—			134			22			156
	Common collective funds		—			60			—			60
	Mutual funds		1,407			—			—			1,407
	Other		(1	)		28			—			27
	Total Plan Investments	$	1,639		$	844		$	264		$	2,747
	Accrued dividends and interest receivable											4
	Net pending trades											(35	)
	Total Plan Assets										$	2,716
		December 31, 2012
	(Dollars in millions)	Level 1			Level 2			Level 3			Total
	Pension Plan Investments:
	Cash and cash equivalents	$	—		$	42		$	—		$	42
	U.S. Government securities		—			214			—			214
	Corporate bonds		—			243			—			243
	Equity securities		158			—			—			158
	Real estate funds		—			—			156			156
	Limited partnerships		—			114			18			132
	Common collective funds		—			58			—			58
	Mutual funds		1,008			—			—			1,008
	Other		—			16			—			16
	Total Plan Investments	$	1,166		$	687		$	174		$	2,027
	Accrued dividends and interest receivable											3
	Net pending trades											(11	)
	Total Plan Assets										$	2,019
		Level 3 Assets for Year Ended December 31, 2013
	(Dollars in millions)	Real Estate Funds			Limited Partnership			Total
	Beginning balance—January 1, 2013	$	156		$	18		$	174
	Unrealized gains (losses)		18			—			18
	Purchases, issuances, sales, and settlements, net		68			4			72
	Ending balance—December 31, 2013	$	242		$	22		$	264
		Level 3 Assets for Year Ended December 31, 2012
	(Dollars in millions)	Real Estate Funds			Limited Partnership			Total
Beginning balance—January 1, 2012	$	136		$	12		$	148
Unrealized gains (losses)		7			1			8
Purchases, issuances, sales, and settlements, net		13			5			18
Ending balance—December 31, 2012	$	156		$	18		$	174
	December 31, 2013
(Dollars in millions)	Level 1			Level 2			Level 3			Total
Other Postretirement Benefits Plan Investments:
Cash and cash equivalents	$	—		$	2			—		$	2
U.S. Government securities		—			33			—			33
Corporate bonds		—			19			—			19
Municipal bonds		—			1			—			1
Mutual funds		133			—			—			133
Pooled separate account		—			63			—			63
Total Plan Investments	$	133		$	118		$	—		$	251
Net pending trades											(6	)
Total Plan Assets										$	245
	December 31, 2012
(Dollars in millions)	Level 1			Level 2			Level 3			Total
Other Postretirement Benefits Plan Investments:
Cash and cash equivalents	$	—		$	9		$	—		$	9
U.S. Government securities		—			24			—			24
Corporate bonds		—			17			—			17
Municipal bonds		—			1			—			1
Mutual funds		109			—			—			109
Pooled separate account		—			40			—			40
Other		—			16			—			16
Total Plan Investments	$	109		$	107		$	—		$	216
Net pending trades											(6	)
Total Plan Assets										$	210
A description of the valuation methodologies used to determine the fair value of the Plans' assets included within the tables above is as follows:
Cash and Cash Equivalents
Cash and cash equivalents include short-term investments of government securities and other debt securities with remaining maturities of less than three months. These short-term investments are classified as Level 2 measurements based on unadjusted prices for similar securities in an active market.
U.S. Government Securities
U.S. Treasury securities are fixed income securities that are debt instruments issued by the United States Department of the Treasury. These securities are classified as Level 2 measurements based on valuations provided by a third-party pricing provider using quoted market prices in an active market for similar securities.
U.S. agency mortgage-backed securities are collateralized by residential mortgage loans and may be prepaid at par prior to maturity. These securities are classified as Level 2 measurements based on valuations provided by a third-party pricing provider using quoted market prices in an active market for similar securities.
Corporate Bonds
Corporate bonds are fixed income securities in investment-grade bonds of U.S. issuers from diverse industries. These securities are classified as Level 2 based on valuations provided by a third-party pricing provider using quoted market prices in an active market for similar securities.
Equity Securities
Equity securities are common stock and the fair value is recorded based on quoted market prices obtained from an exchange. These securities are classified as Level 1 measurements based on unadjusted prices for identical instruments in active markets.
Real Estate Funds
Real estate funds invest in real estate property with a focus on apartment complexes and retail shopping centers. The valuations of these investments require significant judgment due to the absence of quoted market prices, lack of liquidity and the scarcity of observable sales of similar assets. The values are estimated by adjusting the previous quarter's NAV for the current quarter's income and depreciation. These funds are classified as Level 3 measurements due to the use of significant unobservable inputs and judgment to estimate fair value.
Limited Partnerships
Limited partnerships invest in equity securities of diverse foreign companies in developed markets across diverse industries. Limited partnerships are valued using the NAV of the partnership at the end of the period. These partnerships are classified as Level 2 measurements due to the use of quoted market prices of the underlying securities in actively traded markets as the primary input to derive the NAV.
Limited partnerships also invest in real estate properties. These partnerships' value is estimated by adjusting the previous quarter's NAV for the current quarter's income and depreciation. These partnerships are classified as Level 3 measurements due to the use of significant unobservable inputs and judgment to estimate fair value.
Common Collective Funds
Common collective funds invest in bonds of U.S. and foreign issuers and in equity securities of U.S. and foreign real estate companies. These funds are valued using the NAV of the fund at the end of the period. These funds are classified as Level 2 measurements due to the use of quoted market prices of the underlying securities in actively traded markets as the primary input to derive the NAV.
Mutual Funds
Mutual funds invest in equity securities that seek to track the performance of the Standard & Poor's 500, S&P Completion and the EAFE® indexes. These funds are valued using an exchange traded NAV at the end of the period. These mutual funds are classified as Level 1 measurements based on unadjusted quoted prices for identical instruments in active markets.
Pooled Separate Account
The pooled separate account is an investment with Hartford Life Company. The investment consists of four funds that mainly invest in U.S. agency guaranteed mortgage-backed securities, investment-grade bonds of U.S. issuers from diverse industries, and exchange traded equity securities of U.S. and foreign companies. These funds are valued using quoted market prices of the funds' underlying investments to derive the funds' NAV at the end of the period. This investment is classified as a Level 2 measurement due to the use of quoted market prices of similar securities in actively traded markets as the primary input to derive the NAV.
The following table sets forth the benefit obligation activity and the funded status for each of the Company's plans at December 31, 2013 and 2012. In addition, the table sets forth the over (under) funded status at December 31, 2013 and 2012. This pension benefits table does not include the obligations for the Executive Supplemental Benefit Plans (ESBPs).
	Pension Benefits						Other Benefits
	Years Ended						Years Ended
	December 31,						December 31,
(Dollars in millions)	2013			2012			2013			2012
Accumulated benefit obligation	$	2,046		$	2,161
Change in benefit obligation
Benefit obligation, beginning of year	$	2,394		$	2,135		$	293		$	270
Service cost		87			77			14			14
Interest cost		99			101			11			12
Plan participants' contributions		—			—			7			6
Actuarial loss		(243	)		223			(34	)		9
Medicare Part D employer subsidy		—			—			—			2
Benefits paid		(74	)		(142	)		(21	)		(20	)
Benefit obligation, end of year		2,263			2,394			270			293
Fair value of plan assets, end of year		2,716			2,019			245			210
Over (Under) funded status	$	453		$	(375	)	$	(25	)	$	(83	)
The following table illustrates the changes that were reflected in accumulated other comprehensive income during 2013, 2012 and 2011. Pension benefits do not include the ESBPs.
	Pension			Other Benefits
	Benefits
(Dollars in millions)	Net Actuarial			Transition Assets			Net Actuarial
	(Gain) Loss						(Gain) Loss
Amounts Recognized in Other Comprehensive Loss:
Balance, December 31, 2010	$	595		$	3		$	78
Arising during the year		465			—			18
Recognized in net income during the year		(44	)		(2	)		(6	)
Balance, December 31, 2011	$	1,016		$	1		$	90
Arising during the year		115			—			(2	)
Recognized in net income during the year		(89	)		(1	)		(8	)
Balance, December 31, 2012	$	1,042		$	—		$	80
Arising during the year		(468	)		—			(56	)
Recognized in net income during the year		(107	)		—			(7	)
Balance, December 31, 2013	$	467		$	—		$	17
At December 31, 2013 and 2012, the following amounts were recognized in accumulated other comprehensive loss for pension, including ESBPs, and other benefits.
	December 31, 2013
	Pension Benefits									Other Benefits
(Dollars in millions)	Gross			Tax			Net of Tax			Gross			Tax			Net of Tax
Net actuarial loss	$	467		$	184		$	283		$	17		$	7		$	10
Pension and other benefits adjustment		467			184			283			17			7			10
Executive Supplemental Benefits Plans
Net actuarial loss		26			10			16			—			—			—
Executive supplemental benefits plans adjustment		26			10			16			—			—			—
Pension and other benefits adjustment	$	493		$	194		$	299		$	17		$	7		$	10
	December 31, 2012
	Pension Benefits									Other Benefits
(Dollars in millions)	Gross			Tax			Net of Tax			Gross			Tax			Net of Tax
Net actuarial loss	$	1,042		$	410		$	632		$	80		$	32		$	48
Pension and other benefits adjustment		1,042			410			632			80			32			48
Executive Supplemental Benefits Plans
Net actuarial loss		29			11			18			—			—			—
Executive supplemental benefits plans adjustment		29			11			18			—			—			—
Pension and other benefits adjustment	$	1,071		$	421		$	650		$	80		$	32		$	48
The Company expects to make a $100 million cash contribution to the Pension Plan in 2014.
Estimated Future Benefit Payments and Subsidies
The following pension and postretirement benefit payments, which reflect expected future service, as appropriate, are expected to be paid over the next 10 years and Medicare Part D Subsidies are expected to be received over the next 10 years. This table does not include the ESBPs.
(Dollars in millions)	Pension			Postretirement			Medicare Part D
	Benefits			Benefits			Subsidies
Years ending December 31,
2014	$	82		$	15		$	1
2015		89			16			1
2016		97			16			1
2017		105			18			1
2018		113			18			1
Years 2019 - 2023		682			103			6
The following tables summarize the weighted average assumptions used in computing the present value of the benefit obligations and the net periodic benefit cost.
	Pension						Other Benefits
	Benefits
	Years Ended						Years Ended
	December 31,						December 31,
	2013			2012			2013			2012
Discount rate in determining net periodic benefit cost		4.2	%		4.7	%		3.9	%		4.5	%
Discount rate in determining benefit obligations at year end		4.9			4.2			4.6			3.9
Rate of increase in future compensation levels for determining net periodic benefit cost		4.7			4.7			—			—
Rate of increase in future compensation levels for determining benefit obligations at year end		4.7			4.7			—			—
Expected return on plan assets		7.5			7.5			7.5			7.5
	Pension Benefits									Other Benefits									Superannuation,
																			SERP(1) and ESBP
	Years Ended									Years Ended									Years Ended
	December 31,									December 31,									December 31,
(Dollars in millions)	2013			2012			2011			2013			2012			2011			2013		2012		2011
Components of net periodic benefit cost:
Service cost	$	87		$	77		$	58		$	14		$	14		$	11		$	1	$	2	$	1
Interest cost		99			101			98			11			12			13			3		2		4
Expected return on plan assets		(166	)		(147	)		(147	)		(15	)		(13	)		(14	)		—		—		—
Amortization of transition amount		—			—			—			—			1			2			—		—		—
Recognized net actuarial loss		107			89			44			7			8			6			2		2		1
Total net periodic benefit cost	$	127		$	120		$	53		$	17		$	22		$	18		$	6	$	6	$	6
-1
Supplemental Executives Retirement Plan (SERP).
At December 31, 2013 and 2012, the following amounts were forecasted to be recognized in 2014 and 2013 net periodic benefit costs, respectively.
	Years Ended December 31,
	2014						2013
(Dollars in millions)	Pension			Other			Pension			Other
	Benefits			Benefits			Benefits			Benefits
Net actuarial loss	$	55		$	—		$	109		$	6
Amounts to be reclassified from accumulated other comprehensive loss	$	55		$	—		$	109		$	6
The Company's assumed weighted-average healthcare cost trend rates are as follows.
	Years Ended December 31,
	2013			2012			2011
Healthcare cost trend rate assumed for next year		7.71	%		8.31	%		8.9	%
Rate to which cost trend rate is assumed to decline (the ultimate trend rate)		4.5	%		4.5	%		5	%
Year the rate reaches the ultimate trend rate		2021			2021			2018
The healthcare cost trend rate assumptions have a significant effect on the amounts reported for the Health Plan. A one-percentage-point change in assumed healthcare cost trend rates would have the following effects:
(Dollars in millions)	One-Percentage-			One-Percentage-
	Point Increase			Point Decrease
Effect on total of service and interest cost components	$	4		$	(4	)
Effect on postretirement benefit obligation		33			(28	)
Executive Supplemental Benefit Plans
The Company has several ESBPs, which provide eligible employees with supplemental retirement benefits. The plans are nonqualified defined benefit plans and unfunded. The accrued liability for ESBPs included in other liabilities on the Company's consolidated balance sheets was $85 million and $88 million at December 31, 2013 and 2012, respectively.
Section 401(k) Savings Plans
The Company has a defined contribution plan authorized under Section 401(k) of the Internal Revenue Code. All benefits-eligible employees are eligible to participate in the plan. Employees may contribute up to 25 percent of their pre-tax covered compensation or up to 10 percent of their after-tax covered compensation through salary deductions to a combined maximum of 25 percent. The Company contributes 50 percent of every pre-tax dollar an employee contributes up to the first 6 percent of the employee's pre-tax covered compensation. Employees are fully vested in the employer's contributions immediately. In addition, the Company may make a discretionary annual profit-sharing contribution up to 2.5 percent of an employee's pay. This profit-sharing contribution is for all eligible employees, regardless of whether an employee is participating in the 401(k) plan, and is dependent upon the Company's annual financial performance. All employer contributions are tax deductible by the Company. The Company's combined matching contribution expense was $32 million, $29 million and $29 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Other_Noninterest_Income_and_O

Other Noninterest Income and Other Noninterest Expense	12 Months Ended
	Dec. 31, 2013
Other Noninterest Income and Other Noninterest Expense	'
Other Noninterest Income and Other Noninterest Expense	'
	Note 17—Other Noninterest Income and Other Noninterest Expense
	The detail of other noninterest income is as follows.
		Years Ended
		December 31,
	(Dollars in millions)	2013			2012			2011
	Other investment income		33			44			35
	All other noninterest income		(24	)		(28	)		10
	Total other noninterest income	$	9		$	16		$	45
	The detail of other noninterest expense is as follows.
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Software	$	83		$	70		$	66
	LIHC investment amortization		76			63			69
	Advertising and public relations		61			57			45
	Communications		45			39			42
	Data processing		36			36			39
	Other		150			198			147
	Total other noninterest expense	$	451		$	463		$	408

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Taxes	'
Income Taxes	'
	Note 18—Income Taxes
	The following table is an analysis of the effective tax rate.
		Years Ended
		December 31,
		2013			2012			2011
	Federal income tax rate		35	%		35	%		35	%
	Net tax effects of:
	State income taxes, net of federal income tax benefit		5			6			7
	Tax-exempt interest income		(1	)		(1	)		(1	)
	Tax credits		(13	)		(10	)		(10	)
	Change in estimate to the valuation of FDIC covered assets		—			—			(2	)
	Other		(3	)		(3	)		—
	Effective tax rate		23	%		27	%		29	%
	The components of income tax expense were as follows.
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Taxes currently payable:
	Federal	$	79		$	93		$	105
	State		43			32			67
	Foreign		12			14			8
	Total currently payable		134			139			180
	Taxes deferred:
	Federal		71			62			101
	State		(8	)		20			28
	Foreign		(2	)		(1	)		(1	)
	Total deferred		61			81			128
	Total income tax expense	$	195		$	220		$	308
	The components of the Company's net deferred tax balances as of December 31, 2013 and 2012 were as follows.
		December 31,
	(Dollars in millions)	2013			2012
	Deferred tax assets:
	Allowance for loan and unfunded credit commitment losses	$	287		$	338
	Accrued expense, net		216			131
	Unrealized losses on pension and post retirement benefits		204			456
	Unrealized net losses on securities available for sale		262			—
	Fair value adjustments for valuation of FDIC covered assets		183			218
	Other		97			108
	Total gross deferred tax assets		1,249			1,251
	Valuation allowance		—			(10	)
	Total deferred tax assets		1,249			1,241
	Deferred tax liabilities:
	Leasing		698			688
	Intangible assets		105			119
	Pension liabilities		363			251
	Other		17			123
	Total deferred tax liabilities		1,183			1,181
	Net deferred tax asset	$	66		$	60
	At December 31, 2013, we had net operating loss and tax credit carry forwards for which related deferred tax assets of $69.2 million and $36.4 million, respectively, were recorded. The net operating loss and tax credit carry forwards expire in varying amounts through 2033.
	Deferred tax assets are evaluated for realization based on the existence of sufficient taxable income of the appropriate character. Management has determined that no valuation allowance is required.
	The changes in unrecognized tax positions were as follows.
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Balance, beginning of year	$	269		$	274		$	233
	Gross increases as a result of tax positions taken during prior periods		1			7			53
	Gross decreases as a result of tax positions taken during prior periods		(256	)		(13	)		(13	)
	Gross increases as a result of tax positions taken during current period		2			1			1
	Balance, end of year	$	16		$	269		$	274
	The amount of unrecognized tax positions that would affect the effective tax rate, if recognized, was $12 million, $113 million and $115 million at December 31, 2013, 2012 and 2011, respectively.
	The Company recognizes interest and penalties as a component of income tax expense. For 2013 and 2012, the Company reversed $12 million and $14 million of gross interest and penalties as a benefit to income tax expense, respectively. For 2011, we recognized in income tax expense $12 million of gross interest and penalties. As of December 31, 2013, 2012 and 2011, we have accrued $3 million, $15 million, and $29 million of gross interest and penalties, respectively.
	During 2012, we concluded our trial in the U.S. Court of Federal Claims related to tax refund claims for leveraged lease transactions that we entered into in 1998 and 1999. On October 4, 2013, the court rendered its opinion denying our refund claim and, as a result, our liability for unrecognized tax positions decreased by $97 million. Also, during 2013, Union Bank executed a Settlement Agreement (the Settlement) with the California Franchise Tax Board with respect to tax years 2004 - 2007. The Settlement covered a number of issues relating to the allocation and calculation of taxable income to California. In addition, as a result of the Settlement, the Company recorded a decrease in its unrecognized tax positions of $159 million.
	The Company is subject to U.S. federal income tax as well as various state and foreign income taxes. With limited exception, the Company is not open to examination for periods before 2008 by U.S. federal and state taxing authorities.

Regulatory_Capital_Requirement

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements	'
Regulatory Capital Requirements	'
	Note 19—Regulatory Capital Requirements
	The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a material effect on the Company's consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of the Company's and Bank's assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and the Bank's prompt corrective action classification are also subject to qualitative judgments by the regulators about components, risk-weightings and other factors. Prompt corrective action provisions are not applicable to bank holding companies such as the Company. The Bank is subject to laws and regulations that limit the amount of dividends it can pay to the Company.
	Quantitative measures established by regulation to help ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the tables below) of Total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and of Tier 1 capital (as defined) to quarterly average assets (as defined). As of December 31, 2013, management believes the capital ratios of the Bank met all regulatory requirements of "well-capitalized" institutions, which are 10 percent for the Total risk-based capital ratio, 6 percent for the Tier 1 risk-based capital ratio and 5 percent for the Tier 1 leverage ratio. Furthermore, management believes, as of December 31, 2013 and 2012, that the Company and the Bank met all capital adequacy requirements to which they are subject.
	As a result of a recent regulatory communication, which clarified the treatment of certain off-balance sheet credit exposures included in risk-weighted assets, the Company updated the methodologies applied to the calculation of its regulatory capital ratios. The Company applied the new methodology beginning with the Company's December 31, 2012 capital ratios. As a result, the Tier 1 risk-based capital ratio decreased from 12.44 percent to 11.91 percent and the Total risk-based capital ratio decreased from 13.93 percent to 13.34 percent at December 31, 2012. The methodologies applied to the computation of Union Bank's capital ratios were not affected. The Company's and the Bank's capital amounts and ratios are presented in the following tables.
		Actual					For Capital Adequacy Purposes
	(Dollars in millions)	Amount		Ratio			Amount		Ratio
	Capital Ratios for the Company:
	As of December 31, 2013:
	Tier 1 capital (to risk-weighted assets)	$	11,471		12.41	%	³	$3,696	³	4	%
	Total capital (to risk-weighted assets)		13,499		14.61		³	7,393	³	8
	Tier 1 leverage(1)		11,471		11.27		³	4,073	³	4
	As of December 31, 2012:
	Tier 1 capital (to risk-weighted assets)	$	9,864		11.91	%	³	$3,314	³	4	%
	Total capital (to risk-weighted assets)		11,048		13.34		³	6,628	³	8
	Tier 1 leverage(1)		9,864		11.18		³	3,531	³	4
	-1
	Tier 1 capital divided by quarterly average assets (excluding certain intangible assets).
		Actual					For Capital Adequacy Purposes					To Be Well-Capitalized
												Under Prompt Corrective
												Action Provisions
	(Dollars in millions)	Amount		Ratio			Amount		Ratio			Amount		Ratio
	Capital Ratios for the Bank:
	As of December 31, 2013:
	Tier 1 capital (to risk-weighted assets)	$	11,274		12.94	%	³	$3,485	³	4	%	³	$5,228	³	6	%
	Total capital (to risk-weighted assets)		12,990		14.91		³	6,970	³	8		³	8,713	³	10
	Tier 1 leverage(1)		11,274		11.13		³	4,051	³	4		³	5,063	³	5
	As of December 31, 2012:
	Tier 1 capital (to risk-weighted assets)	$	9,192		11.68	%	³	$3,147	³	4	%	³	$4,720	³	6	%
	Total capital (to risk-weighted assets)		10,362		13.17		³	6,294	³	8		³	7,867	³	10
	Tier 1 leverage(1)		9,162		10.51		³	3,498	³	4		³	4,373	³	5
	-1
	Tier 1 capital divided by quarterly average assets (excluding certain intangible assets).

Restrictions_on_Cash_and_Due_f

Restrictions on Cash and Due from Banks, Securities, Loans and Dividends	12 Months Ended
	Dec. 31, 2013
Restrictions on Cash and Due from Banks, Securities, Loans and Dividends	'
Restrictions on Cash and Due from Banks, Securities, Loans and Dividends	'
	Note 20—Restrictions on Cash and Due from Banks, Securities, Loans and Dividends
	Federal Reserve regulations require the Bank to maintain reserve balances based on the types and amounts of deposits received. The required reserve balances were $398 million and $412 million at December 31, 2013 and 2012, respectively.
	As of December 31, 2013 and 2012, loans of $50.2 billion and $43.6 billion, respectively, were pledged as collateral for borrowings, including those to the Federal Reserve Bank and FHLB, to secure public and trust department deposits, and for repurchase agreements as required by contract or law. See Note 4 to these consolidated financial statements for the carrying amounts of securities that were pledged as collateral.
	The Federal Reserve Act restricts the amount and the terms of both credit and non-credit transactions between a bank and its non-bank affiliates. Such transactions may not exceed 10 percent of the bank's capital and surplus (which for this purpose represents Tier 1 and Tier 2 capital, as calculated under the risk-based capital guidelines, plus the balance of the allowance for loan losses excluded from Tier 2 capital) with any single non-bank affiliate and 20 percent of the bank's capital and surplus with all its non-bank affiliates. Transactions that are extensions of credit may require collateral to be held to provide added security to the bank. See Note 19 to these consolidated financial statements for further discussion of risk-based capital. At December 31, 2013, $242 million remained outstanding on 24 Bankers Commercial Corporation notes payable to the Bank. The respective notes were fully collateralized with equipment lease assets pledged by Bankers Commercial Corporation.
	The declaration of a dividend by the Bank to the Company is subject to the approval of the OCC if the total of all dividends declared in the current calendar year plus the preceding two years exceeds the Bank's total net income in the current calendar year plus the preceding two years. The payment of dividends is also limited by minimum capital requirements imposed on national banks by the OCC.

Commitments_Contingencies_and_

Commitments, Contingencies and Guarantees	12 Months Ended
	Dec. 31, 2013
Commitments, Contingencies and Guarantees	'
Commitments, Contingencies and Guarantees	'
	Note 21—Commitments, Contingencies and Guarantees
	The following table summarizes the Company's commitments.
	(Dollars in millions)	December 31, 2013
	Commitments to extend credit	$	33,107
	Issued standby and commercial letters of credit		5,881
	Other commitments		206
	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 December 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 unfunded credit commitments. The carrying amounts of the standby and commercial letters of credit and the allowance for losses on unfunded credit 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 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 has rental commitments under long-term operating lease agreements. For detail of these commitments, see Note 6 to these consolidated financial statements.
	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 December 31, 2013, the current exposure to loss under these contracts totaled $13.8 million, and the maximum potential exposure to loss in the future was estimated at $45.2 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.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2013
Related Party Transactions	'
Related Party Transactions	'
	Note 22—Related Party Transactions
	The Company had, and expects to have in the future, banking transactions and other transactions in the ordinary course of business with BTMU and with its affiliates. During 2013, 2012 and 2011, such transactions included, but were not limited to, purchases and sales of loans, purchases and sales of interest rate derivatives and foreign exchange transactions, funds transfers, custodianships, investment advice and management, customer referrals, facility leases, and administrative and trust services. In September 2008, the Company established a $500 million, three-year unsecured revolving credit facility with BTMU. This credit facility was renewed and expires in July 2016. As of December 31, 2013, the Company had no outstanding balance under this facility. In the opinion of management, these transactions were made at rates, terms and conditions prevailing in the market and do not involve more than the normal risk of collectability or present other unfavorable features. In addition, some compensation for services rendered to the Company is paid to the expatriate officers from BTMU, and reimbursed by the Company to BTMU under a service agreement. Under a similar arrangement, BTMU reimburses the Company for services the Company provides to BTMU.  The Company incurred expenditures related to the implementation of Basel II, which were reimbursed by BTMU, of $19 million, $39 million and $42 million in 2013, 2012 and 2011, respectively.
	During the fourth quarter of 2013, the Company received a $1.2 billion common equity contribution from BTMU and also issued $300 million of subordinated debt to BTMU. During the second quarter of 2013, the Bank issued $750 million of subordinated debt to BTMU. See Note 11 to these consolidated financial statements for more information on subordinated debt due to BTMU.
	Effective October 1, 2011, BTMU transferred its trust company, BTMUT, to the Company. This transaction had the effect of increasing the Company's assets by $990 million, which mainly consisted of cash and due from banks, loans and leveraged leases. The Company also assumed BTMUT's liabilities, which included short-term borrowings of $38 million. The Company's Tier 1 common capital increased by $783 million.
	At December 31, 2013 and 2012, the Company had derivative contracts totaling $735 million and $415 million, respectively, in notional balances, with $7 million and $10 million in net unrealized losses with BTMU and its affiliates in 2013 and 2012, respectively. In 2013, 2012 and 2011, the Company recorded noninterest income of $33 million, $21 million and $18 million, respectively, and noninterest expenses of $13 million, $18 million and $12 million, respectively, for fees paid, revenue sharing and facility and staff arrangements. In 2013, the Company also recorded reimbursements for facility and staff arrangements of $31 million as a reduction of noninterest expense, primarily related to the reimbursement from BTMU for expenditures related to the implementation of Basel II.
	The Company may extend credit to BTMU, in the form of daylight overdrafts in BTMU's accounts with the Company in the ordinary course of business. There were no overdraft balances outstanding as of December 31, 2013 and 2012.

Business_Segments

Business Segments	12 Months Ended
	Dec. 31, 2013
Business Segments	'
Business Segments	'
	Note 23—Business Segments
	During the fourth quarter 2013, the composition of the Company's reporting segments were revised to reflect a new internal management structure resulting from the BTMU Americas Holdings business integration initiative announced in 2013. The Company now has five reportable segments: Retail Banking & Wealth Markets, Commercial Banking, Corporate Banking, Transaction Banking, and Investment Banking & Markets. Prior period segment results have been revised to conform to current period presentation. Below is a detailed description of these reportable segments.
	Retail Banking & Wealth Markets
	Retail Banking & Wealth Markets offers a range of banking products and services to individuals and small businesses, including high net worth individuals and institutional clients, delivered generally through a network of branches, private banking offices, ATMs, broker mortgage referrals, telephone services, and web-based and mobile banking applications. These products and services include mortgages, home equity lines of credit, consumer and commercial loans, deposit accounts, financial planning and investments.
	The Consumer Lending Division provides the centralized origination, underwriting, processing, servicing, collection and administration for consumer assets including residential mortgages.
	The Community Banking Division serves its customers through 359 full-service branches in California and 45 full-service branches in Washington and Oregon, as well as through ATMs, call centers, web-based and mobile internet banking applications and through alliances with other financial institutions. Community Banking provides checking and deposit products and services; bill and loan payment, merchant, and various types of consumer financing and investment services; and products including credit cards.
	The Wealth Markets Division serves its customers through the Private Bank; UnionBanc Investment Services LLC (UBIS), a subsidiary of Union Bank and a registered broker-dealer and investment advisor; and Asset Management which includes HighMark Capital Management, Inc., a subsidiary of Union Bank and a registered investment advisor. Wealth Markets provides investment management and advisory services to institutional clients, wealth planning, deposits and risk management strategies, trust and estate administration, as well as investment sub-advisory services to the unaffiliated HighMark Funds. Products provided to its customers include traditional brokerage, managed accounts, annuities, mutual funds, fixed income products and insurance and customized lending.
	Commercial Banking
	Commercial Banking provides credit products including commercial loans, and accounts receivable, inventory, project, trade and real estate financing to corporate customers with revenues generally less than $2 billion. Commercial Banking also offers its customers a range of noncredit services and products, which include global treasury management and capital markets solutions, foreign exchange and various interest rate risk and commodity risk management products through cooperation with other segments.
	Commercial Banking is comprised of five main divisions: Western Markets, which serves companies primarily in California, Oregon and Washington; Petroleum, which serves oil and gas companies; Expansion Markets, which serves clients nationally, outside of the western states, and also targets certain defined industries such as entertainment and technology; Specialized Products, which focuses on specific industries on a national basis including commercial finance, funds finance, environmental services, non-profits, healthcare, and transportation, aerospace and defense; and Real Estate Industries, which serves professional real estate investors and developers. Additionally, through its Community Development Finance unit, tax credit investments are made in affordable housing projects, as well as construction and permanent financing.
	Corporate Banking
	Corporate Banking provides commercial lending products, including commercial loans, lines of credit and project financing, to corporate customers with revenues generally greater than $2 billion. The segment employs an industry-focused strategy including dedicated coverage teams in General Industries, Power and Utilities, Oil and Gas, Telecom and Media, Technology, Healthcare, Public Finance, and Financial Institutions (predominantly Insurance and Asset Managers). By working with the Company's other segments, Corporate Banking offers its customers a range of noncredit services, which include global treasury management and capital market solutions, and foreign exchange and various interest rate risk and commodity risk management products.
	Transaction Banking
	Transaction Banking works alongside the Company's other segments to provide working capital management and asset servicing solutions, including deposits and treasury management, trade finance, and institutional trust and custody, to the Company's customers. This segment also manages the digital banking channels for retail, small business, wealth management and commercial clients, as well as commercial product development. The client base consists of financial institutions, corporations, government agencies, insurance companies, mutual funds, investment managers and non-profit organizations.
	Investment Banking & Markets
	Investment Banking & Markets, which includes Global Capital Markets, works with the Company's other segments to provide customers structured credit services, including project finance; foreign exchange, interest rate and energy risk management solutions; and to facilitate merchant and investment banking-related transactions. Additionally, the segment's leasing arm provides lease and other financing services to corporate customers.
	Other
	"Other" includes the Asian Corporate Banking segment, Corporate Treasury and the impact of certain corporate activities. The Asian Corporate Banking segment 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 is responsible for 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 the Company's balance sheet and to manage those risks within the guidelines established by ALCO. For additional discussion regarding these risk management activities, see "Quantitative and Qualitative Disclosures About Market Risk" in Part II, Item 7A of this Form 10-K.
	Additionally, "Other" is comprised of certain corporate activities of the Company; the net impact of funds transfer pricing charges and credits allocated to the reportable segments; the residual costs of support groups; the unallocated allowance; goodwill, intangible assets, and the related amortization/accretion associated with the Company's privatization transaction; the elimination of the fully taxable-equivalent basis amount; the difference between the marginal tax rate and the consolidated effective tax rate; and the FDIC covered assets.
	The information, set forth in the tables that follow, is prepared using various management accounting methodologies to measure the performance of the individual segments. Unlike U.S. GAAP there is no standardized or authoritative guidance for management accounting. 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 the 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, an activity-based costing methodology, other indirect costs and a methodology to allocate the provision for credit losses. The fund transfer pricing system assigns a cost of funds or a credit for funds to assets or liabilities based on their type, maturity or repricing characteristics. The activity-based costing methodology allocates certain indirect costs, such as operations and technology expense, 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. The Company periodically changes or updates its management accounting methodologies in the normal course of business. Beginning with third quarter 2013, credit losses allocated to the operating segments were revised to base the allocation on the Company's actual provision for credit losses. The allocation of credit losses was previously based on an expected credit loss allocation methodology. Prior period results have been adjusted to reflect these changes.
	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."
	As of and for the Year Ended December 31, 2013:
	(Dollars in millions)	Retail			Commercial			Corporate		Transaction			Investment		Other			Reconciling			UnionBanCal
		Banking &			Banking			Banking		Banking			Banking &					Items			Corporation
		Wealth											Markets
		Markets
	Results of operations—Market View
	Net interest income (expense)	$	1,352		$	901		$	87	$	420		$	184	$	55		$	(283	)	$	2,716
	Noninterest income (expense)		371			196			64		161			210		64			(190	)		876
	Total revenue		1,723			1,097			151		581			394		119			(473	)		3,592
	Noninterest expense		1,423			413			48		362			100		574			(127	)		2,793
	(Reversal of) provision for loan losses		(36	)		46			1		(3	)		6		(55	)		(4	)		(45	)
	Income (loss) before income taxes and including noncontrolling interests		336			638			102		222			288		(400	)		(342	)		844
	Income tax expense (benefit)		132			155			40		88			78		(165	)		(133	)		195
	Net income (loss) including noncontrolling interest		204			483			62		134			210		(235	)		(209	)		649
	Deduct: net loss from noncontrolling interests		—			—			—		—			—		18			—			18
	Net income (loss) attributable to UnionBanCal	$	204		$	483		$	62	$	134		$	210	$	(217	)	$	(209	)	$	667
	Total assets, end of period	$	34,582		$	32,704		$	3,339	$	1,627		$	5,933	$	29,106		$	(1,397	)	$	105,894
	As of and for the Year Ended December 31, 2012:
	(Dollars in millions)	Retail			Commercial			Corporate		Transaction			Investment		Other			Reconciling			UnionBanCal
		Banking &			Banking			Banking		Banking			Banking &					Items			Corporation
		Wealth											Markets
		Markets
	Results of operations—Market View
	Net interest income (expense)	$	1,204		$	753		$	83	$	451		$	174	$	229		$	(292	)	$	2,602
	Noninterest income (expense)		336			211			64		167			207		31			(198	)		818
	Total revenue		1,540			964			147		618			381		260			(490	)		3,420
	Noninterest expense		1,294			393			50		356			77		527			(131	)		2,566
	(Reversal of) provision for loan losses		55			(47	)		24		(1	)		6		(9	)		(3	)		25
	Income (loss) before income taxes and including noncontrolling interests		191			618			73		263			298		(258	)		(356	)		829
	Income tax expense (benefit)		75			166			29		104			86		(102	)		(138	)		220
	Net income (loss) including noncontrolling interest		116			452			44		159			212		(156	)		(218	)		609
	Deduct: net loss from noncontrolling interests		—			—			—		—			—		19			—			19
	Net income (loss) attributable to UnionBanCal	$	116		$	452		$	44	$	159		$	212	$	(137	)	$	(218	)	$	628
	Total assets, end of period	$	31,804		$	25,450		$	3,025	$	1,631		$	7,137	$	29,065		$	(1,104	)	$	97,008
	As of and for the Year Ended December 31, 2011:
	(Dollars in millions)	Retail			Commercial			Corporate		Transaction			Investment		Other			Reconciling			UnionBanCal
		Banking &			Banking			Banking		Banking			Banking &					Items			Corporation
		Wealth											Markets
		Markets
	Results of operations—Market View
	Net interest income (expense)	$	1,202		$	708		$	77	$	468		$	131	$	175		$	(320	)	$	2,441
	Noninterest income (expense)		359			198			81		161			159		84			(215	)		827
Total revenue		1,561			906			158		629			290		259			(535	)		3,268
Noninterest expense		1,271			392			48		347			63		433			(139	)		2,415
(Reversal of) provision for loan losses		(82	)		(106	)		8		(10	)		66		(79	)		1			(202	)
Income (loss) before income taxes and including noncontrolling interests		372			620			102		292			161		(95	)		(397	)		1,055
Income tax expense (benefit)		146			161			40		114			38		(37	)		(154	)		308
Net income (loss) including noncontrolling interest		226			459			62		178			123		(58	)		(243	)		747
Deduct: net loss from noncontrolling interests		—			—			—		—			—		15			—			15
Net income (loss) attributable to UnionBanCal	$	226		$	459		$	62	$	178		$	123	$	(43	)	$	(243	)	$	762
Total assets, end of period	$	26,956		$	22,435		$	2,613	$	1,668		$	6,326	$	30,472		$	(774	)	$	89,696

Condensed_UnionBanCal_Corporat

Condensed UnionBanCal Corporation Unconsolidated Financial Statements (Parent Company)	12 Months Ended
	Dec. 31, 2013
Condensed UnionBanCal Corporation Unconsolidated Financial Statements (Parent Company)	'
Condensed UnionBanCal Corporation Unconsolidated Financial Statements (Parent Company)	'
	Note 24—Condensed UnionBanCal Corporation Unconsolidated Financial Statements (Parent Company)
	Condensed Balance Sheets
		December 31,
	(Dollars in millions)	2013			2012
	Assets
	Cash and cash equivalents	$	191		$	763
	Investment in subsidiaries		14,784			12,544
	Other assets		5			24
	Total assets	$	14,980		$	13,331
	Liabilities and Stockholder's Equity
	Long-term debt	$	763		$	869
	Other liabilities		2			1
	Total liabilities		765			870
	Stockholder's equity		14,215			12,461
	Total liabilities and stockholder's equity	$	14,980		$	13,331
	Condensed Statements of Income
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Income:
	Dividends from bank subsidiary	$	—		$	950		$	—
	Interest income on advances to subsidiaries and deposits in bank		—			1			1
	Total income		—			951			1
	Expense:
	Interest expense		31			23			13
	Other expense		4			—			18
	Total expense		35			23			31
	Income (loss) before income taxes and equity in undistributed net income of subsidiaries		(35	)		928			(30	)
	Income tax benefit		(14	)		(9	)		(10	)
	Income (loss) before equity in undistributed net income of subsidiaries		(21	)		937			(20	)
	Equity in undistributed net income (loss) of subsidiaries:
	Bank subsidiary		625			(403	)		783
	Nonbank subsidiaries		63			94			(1	)
	Net Income	$	667		$	628		$	762
	Condensed Statements of Cash Flows
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Cash Flows from Operating Activities:
	Net income	$	667		$	628		$	762
	Adjustments to reconcile net income (loss) to net cash provided by operating activities:
	Equity in undistributed net (income) loss of subsidiaries		(688	)		309			(782	)
	Other, net		14			(14	)		(3	)
	Net cash provided by (used in) operating activities		(7	)		923			(23	)
	Cash Flows from Investing Activities:
	Investments in and advances to subsidiaries		(1,700	)		—			(23	)
	Repayment of investments in and advances to subsidiaries		35			650			20
	Net cash acquired from (paid for) acquisitions		—			(1,457	)		—
	Net cash used in investing activities		(1,665	)		(807	)		(3	)
	Cash Flows from Financing Activities:
	Capital contribution from The Bank of Tokyo-Mitsubushi UFJ, Ltd. (BTMU)		1,200			—			—
	Proceeds from issuance of subordinated loan due to BTMU		300			—			—
	Proceeds from issuance of senior debt		—			397			—
	Repayment of subordinated debt		(400	)		—			—
	Repayment of junior subordinated debt		—			—			(14	)
	Other, net		—			(2	)		—
	Net cash provided by (used in) financing activities		1,100			395			(14	)
	Net increase (decrease) in cash and cash equivalents		(572	)		511			(40	)
	Cash and cash equivalents at beginning of year		763			252			292
	Cash and cash equivalents at end of year	$	191		$	763		$	252

Summary_of_Significant_Account1

Summary of Significant Accounting Policies and Nature of Operations (Policies)	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies and Nature of Operations	'
Principles of Consolidation and Basis of Financial Statement Presentation	'
	Principles of Consolidation and Basis of Financial Statement Presentation
	The consolidated financial statements include the accounts of the Company and other entities in which the Company has a controlling financial interest. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity (VIE). The primary beneficiary of a VIE is the entity that has the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and has the obligation to absorb losses or receive benefits from the VIE that could potentially be significant to the VIE. Results of operations from VIEs are included from the dates that the Company became the primary beneficiary. All intercompany transactions and balances with consolidated entities are eliminated in consolidation.
	The Company accounts for equity investments over which it exerts significant influence using the equity method of accounting. Non-marketable equity investments where the Company does not exert significant influence are accounted for at cost. Investments accounted for under both the equity method and cost method are included in other assets.
	The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America (U.S. GAAP). The policies that materially affect the determination of financial position, results of operations and cash flows are summarized below.
	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 fair value of assets acquired and liabilities assumed (Note 3), the evaluation of other-than-temporary impairment on investment securities (Note 4), the allowance for credit losses (Note 5), purchased credit-impaired loans (Note 5), goodwill impairment (Note 7), pension accounting (Note 16), income taxes (Note 18), fair value of financial instruments (Note 12), and hedge accounting (Note 13).
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash and cash equivalents include cash and due from banks, interest bearing deposits in banks, and federal funds sold and securities purchased under resale agreements, which have original maturities less than 90 days.
Resale and Repurchase Agreements	'
	Resale and Repurchase Agreements
	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. These agreements accounted for as collateralized financings are recorded at the amounts at which the securities were acquired or sold, plus accrued interest, and are carried at amortized cost. The Company's policy is to obtain possession of collateral with a market value equal to or in excess of the principal amount financed under resale agreements. Collateral is valued daily, and the Company may require counterparties to deposit additional collateral or return collateral pledged, when appropriate.
Trading Account Assets and Liabilities	'
	Trading Account Assets and Liabilities
	Trading account assets are recorded at fair value and include securities that management acquires with the intent to hold for short periods of time in order to take advantage of anticipated changes in fair values or as an accommodation to customers. Substantially all of the securities have a high degree of liquidity and a readily determinable fair value. Interest on trading account assets is included in interest income. Realized gains and losses from the sale of trading account positions and unrealized fair value adjustments are recognized in noninterest income.
	Derivatives included in trading account assets and liabilities are reported at fair value, with changes in fair values included in noninterest income in the period in which the changes occur, taking into consideration the effects of legally enforceable master netting agreements that allow the Company to settle positive and negative positions in the event of bankruptcy. Derivatives included in trading account assets and liabilities are primarily interest rate swaps and options, energy derivative contracts and foreign exchange contracts, entered into either for trading purposes or as an accommodation to customers. Derivatives that are not entered into for trading purposes are classified in other assets or other liabilities.
Securities	'
	Securities
	Securities are classified based on management's intent and recorded on the consolidated balance sheet as of trade date, when acquired in a regular-way trade. Securities for which management has both the positive intent and ability to hold to maturity are classified as held to maturity and are carried at amortized cost. Debt securities and equity securities with readily determinable fair values that are not classified as trading assets or held to maturity are classified as available for sale and are carried at fair value, with the unrealized gains or losses reported net of taxes as a component of accumulated other comprehensive income (loss) in stockholder's equity until realized.
	Interest income on debt securities classified as either available for sale or held to maturity includes the amortization of premiums and the accretion of discounts using a method that produces a level yield and is included in interest income on securities.
	Debt securities in the available for sale and held to maturity portfolios are subject to impairment testing when their fair value is lower than amortized cost at the end of a reporting period. Unrealized losses are considered other-than-temporarily impaired if the Company intends to sell the security, if it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, or if the Company does not expect to recover the entire amortized cost basis of the security. In determining whether impairment is other than temporary, the Company considers expected cash flows utilizing a number of assumptions such as default rates, reinvestment rates, and business models considering current and projected financial performance and overall economic conditions.
	If the Company intends to sell the debt security, or if it is more likely than not that the Company will be required to sell the security before recovery, an other-than-temporary impairment write-down is recognized in earnings equal to the entire difference between the amortized cost basis and fair value of the debt security. However, even if the Company does not expect to sell a debt security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the Company must evaluate the expected cash flows to be received and determine if a credit loss exists. In the event of a credit loss in this case, only the amount of impairment associated with the credit loss is recognized in income and amounts related to factors other than credit losses are recorded in other comprehensive income.
	Marketable equity securities are subject to testing for other-than-temporary impairment when there is a severe or sustained decline in market price below the amount recorded for that investment. The Company considers the issuer's financial condition, capital strength, and near-term prospects in assessing whether other-than-temporary impairment exists. An other-than-temporary impairment results in a write-down recognized in earnings equal to the entire difference between the carrying amount and fair value of the equity security.
	Realized gains and losses on the sale of available for sale securities and credit losses related to other-than-temporary impairment on available for sale and held to maturity securities are included in noninterest income as securities gains, net. The specific identification method is used to calculate realized gains and losses on sales.
	Securities available for sale that are pledged under an agreement to repurchase and which may be sold or repledged under that agreement have been separately identified as pledged as collateral.
Loans Held for Investment, Purchased Credit-Impaired Loans, Other Acquired Loans and Loans Held for Sale	'
	Loans Held for Investment, Purchased Credit-Impaired Loans, Other Acquired Loans and Loans Held for Sale
	Loans held for investment are reported at the principal amounts outstanding, net of charge-offs, unamortized nonrefundable loan fees, direct loan origination costs, purchase premiums and discounts, and a historical fair value adjustment related to the Company's privatization transaction. Where loans are held for investment, the net basis adjustment excluding charge-offs on the loan is generally recognized in interest income on an effective yield basis over the contractual loan term.
	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. Loans are generally placed on nonaccrual when such loans have become contractually past due 90 days with respect to principal or interest. Past due status is determined based on the contractual terms of the loan and the number of payment cycles since the last payment date. Interest accruals are continued past 90 days for certain small business loans and consumer installment loans, which are charged off at 120 days. For the commercial loan portfolio segment, interest accruals are also continued for loans that are both well-secured and in the process of collection.
	When a loan is placed on nonaccrual status, all previously accrued but uncollected interest is reversed against current period interest income. When full collection of the outstanding principal balance is in doubt, subsequent payments received are first applied to unpaid principal and then to uncollected interest. A loan may be returned to accrual status at such time as the loan is brought fully current as to both principal and interest, and such loan is considered to be fully collectible on a timely basis. The Company's policy also allows management to continue the recognition of interest income on certain loans placed on nonaccrual status. This portion of the nonaccrual portfolio is referred to as "Cash Basis Nonaccrual" under which the accrual of interest is suspended and interest income is recognized only when collected. This policy applies to consumer portfolio segment loans and commercial portfolio segment loans that are well-secured and in management's judgment are considered to be fully collectible but the timely collection of payments is in doubt.
	A troubled debt restructuring (TDR) is a restructuring of a loan in which the creditor, for economic or legal reasons related to the borrower's financial difficulties, grants a concession to the borrower that it would not otherwise consider. A loan subject to such a restructuring is accounted for as a TDR. A TDR typically involves a modification of terms such as a reduction of the interest rate below the current market rate for a loan with similar risk characteristics or extending the maturity date of the loan without corresponding compensation or additional support. The Company measures impairment of a TDR using the methodology described for individually impaired loans (see "Allowance for Loan Losses" below). For the 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 the commercial portfolio segment, the Company generally determines 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.
	Loans acquired in a transfer, including business combinations, are recorded at fair value at the acquisition date, factoring in credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for loan losses is not carried over or recorded for other acquired loans as of the acquisition date.
	For acquired loans where there is evidence of credit deterioration since origination and it is probable at the date of acquisition that the Company will not collect all contractually required principal and interest payments, the loans are accounted for as purchased credit-impaired loans. This guidance requires that the excess of the cash flows initially expected to be collected over the loan's fair value at the acquisition date (i.e., the accretable yield) be accreted into interest income over the loan's estimated remaining life using the effective yield method, provided that the timing and amount of future cash flows is reasonably estimable. Accordingly, such loans are not classified as nonaccrual and are considered to be accruing. The difference between the contractually required payments and the cash flows expected to be collected at acquisition, considering the impact of prepayments, is referred to as the nonaccretable difference. We have aggregated substantially all of the purchased credit-impaired loans into pools based on common risk characteristics, which results in the pool becoming the unit of account.
	Subsequent to acquisition of purchased credit-impaired loans, estimates of cash flows expected to be collected are updated each reporting period based on updated assumptions that are reflective of current market conditions. If there is a probable decrease in cash flows expected to be collected (other than due to decreases in interest rate indices), the Company charges the provision for credit losses, resulting in an increase to the allowance for loan losses. If there is a probable and significant increase in cash flows expected to be collected, the Company will first reverse any previously established allowance for loan losses and then increase interest income as a prospective yield adjustment over the remaining life of the pool of loans, which also has the effect of reclassifying a portion of the nonaccretable difference to accretable yield. The impact of changes in variable interest rates are recognized prospectively as adjustments to interest income.
	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.
	For other acquired loans, the purchase premium or discount is accreted to interest income over the remaining contractual life of the loans when the loans are performing, or immediately upon prepayment.
	Loans held for sale, which are recorded in other assets, are carried at the lower of cost or fair value on an individual basis for commercial loans and on an aggregate basis for residential mortgage loans. Changes in fair value are recognized in other noninterest income. Nonrefundable fees, direct loan origination costs, and purchase premiums and discounts related to loans held for sale are deferred and recognized as a component of the gain or loss on sale. Contractual interest earned on loans held for sale is recognized in interest income.
	The Company primarily offers two types of leases to customers: 1) direct financing leases where the assets leased are acquired without additional financing from other sources, and 2) leveraged leases where a substantial portion of the financing is provided by debt with no recourse to the Company. Direct financing leases and leveraged leases are carried net of unearned income, unamortized nonrefundable fees and related direct costs associated with the origination of leases, and, applicable for leveraged leases only, net of nonrecourse debt.
Allowance for Loan Losses	'
	Allowance for Loan Losses
	The Company maintains an allowance for loan losses to absorb losses inherent in the loan portfolio. The allowance is based on ongoing, quarterly assessments of the probable estimated losses inherent in the loan portfolio. The allowance is increased by the provision for loan losses, which is charged against current period operating results and decreased by the amount of charge-offs, net of recoveries. The Company's methodology for assessing the appropriateness of the allowance consists of several key elements, which include the allowance for loans collectively evaluated for impairment, the allowance for loans individually evaluated for impairment, and the unallocated allowance. Management estimates probable losses inherent in the portfolio based on a loss emergence period. The loss emergence period is the estimated average period of time between a material adverse event affecting the creditworthiness of a borrower and the subsequent recognition of a loss. Updates of the loss emergence period are performed when significant events cause management to reexamine data. Management develops and documents its systematic methodology for determining the allowance for loan losses by first dividing its portfolio into segments—the commercial segment, consumer segment and purchased credit-impaired loans. The Company further divides the portfolio segments into classes based on initial measurement attributes, risk characteristics or its method of monitoring and assessing credit risk. The classes for the Company include commercial and industrial, commercial mortgage, construction, residential mortgage, home equity and other consumer loans, and purchased credit-impaired loans. While the Company's methodology attributes portions of the allowance to specific portfolio segments, the entire allowance is available to absorb credit losses inherent in the total loan portfolio.
	For the commercial portfolio segment, the allowance for loans collectively evaluated for impairment is calculated by applying loss factors to outstanding loans and most unused commitments, based on the internal risk rating of such loans. Loss factors are based on historical loss experience and may be adjusted for significant qualitative considerations that, in management's judgment, affect the collectability of the portfolio as of the evaluation date. Those qualitative considerations are based upon management's evaluation of certain risks that may be identified from current conditions and developments within the portfolio that are not directly measured in the computation of the loss factors. Loss factors for individually graded credits are derived from a loan migration application that tracks historical losses over an economic cycle, which management believes captures the inherent losses in our loan portfolio.
	For the consumer portfolio segment, loans are generally pooled by product type with similar risk characteristics. The Company estimates the allowance for loans collectively evaluated for impairment based on forecasted losses. For the purchased credit-impaired segment, we charge the provision for loan losses, resulting in an increase to the allowance for loan losses when there is a probable decrease in cash flows expected to be collected.
	The allowance for loans collectively evaluated for impairment also includes attributions for certain sectors within the commercial and consumer portfolio segments to account for probable losses that are currently not reflected in the derived loss factors. Segment attributions are calculated based on migration scenarios for the commercial portfolio and specific attributes applicable to the consumer portfolio. Segment considerations are revised periodically as portfolio and environmental conditions change.
	Estimates of cash flows expected to be collected for purchased credit-impaired loans are updated each reporting period. If there is a probable decrease in expected cash flows to be collected after acquisition (other than due to decreases in interest rate indices or changes in voluntary prepayments), the Company charges the provision for loan losses and establishes an allowance for loan losses.
	The Company individually evaluates for impairment larger nonaccruing loans within the commercial portfolio. Residential mortgage and consumer loans are not individually evaluated for impairment unless they represent TDRs. Loans are considered impaired when the evaluation of current information regarding the borrower's financial condition, loan collateral, and cash flows indicates that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement, including interest payments. The amount of impairment is measured using the present value of expected future cash flows discounted at the loan's effective rate, the loan's observable market price, or the fair value of the collateral, if the loan is collateral dependent.
	The unallocated allowance is composed of attributions that are intended to capture probable losses from adverse changes in credit migration and other inherent losses that are not currently reflected in the allowance for loan losses that are ascribed to our portfolio segments.
	Significant risk characteristics considered in estimating the allowance for credit losses include the following:
	•
	Commercial and industrial—industry specific economic trends and individual borrower financial condition
	•
	Construction and commercial mortgage loans—type of property (i.e., residential, commercial, industrial), geographic concentrations, and risks and individual borrower financial condition
	•
	Residential mortgage and consumer—historical and expected future charge-offs, borrower's credit, property collateral, and loan characteristics
	Loans are charged off in whole or in part when they are considered to be uncollectible. Loans in the commercial loan portfolio segment are generally considered uncollectible based on an evaluation of borrower financial condition as well as the value of any collateral. Loans in the consumer portfolio segment are generally considered uncollectible based on past due status or the execution of certain TDR modifications such as discharge through Chapter 7 bankruptcy and the value of any collateral. Recoveries of amounts previously charged off are recorded as a recovery to the allowance for loan losses.
Allowance for Losses on Unfunded Credit Commitments	'
	Allowance for Losses on Unfunded Credit Commitments
	The Company maintains an allowance for losses on unfunded credit commitments to absorb losses inherent in those commitments upon funding. The Company's methodology for assessing the appropriateness of this allowance is the same as that used for the allowance for loan losses (see "Allowance for Loan Losses" above) and incorporates an assumption based upon historical experience of likely utilization. The allowance for losses on unfunded credit commitments is classified as other liabilities and the change in this allowance is recognized in noninterest expense. Losses on unfunded credit commitments are identified when exposures committed to customers facing difficulty are drawn upon, and subsequently result in charge-offs.
Premises and Equipment	'
	Premises and Equipment
	Premises and equipment are carried at cost, less accumulated depreciation and amortization, impairment, and fair value adjustments related to the Company's privatization transaction. Depreciation and amortization are calculated using the straight-line method over the estimated useful life of each asset. Lives of premises range from ten to fifty years; lives of furniture, fixtures and equipment range from three to eight years. Leasehold improvements are amortized over the term of the respective lease or the estimated useful life of the improvement, whichever is shorter.
	Long-lived assets that are held for use are evaluated periodically for impairment when events or changes in circumstances indicate that the carrying amount may not be recoverable. Impairment is determined if the expected undiscounted future cash flows of a long-lived asset or group of assets is lower than its carrying amount. In the event of impairment, the Company recognizes a loss for the difference between the carrying amount and the fair value of the asset. The impairment loss is recognized in noninterest expense. Restoration of a previously recognized impairment loss is prohibited.
Goodwill and Identifiable Intangible Assets	'
	Goodwill and Identifiable Intangible Assets
	Intangible assets represent purchased assets that lack physical substance and can be separately distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold, exchanged, or licensed. Intangible assets are recorded at fair value at the date of acquisition.
	Intangible assets that have indefinite lives are tested for impairment at least annually, and more frequently in certain circumstances. Intangible assets that have finite lives, which include core deposit intangibles, customer relationships, non-compete agreements and trade names, are amortized either using the straight-line method or a method that patterns the manner in which the economic benefit is consumed. Intangible assets are amortized over their estimated periods of benefit, which range from three to forty years. The Company periodically evaluates the recoverability of intangible assets and takes into account events or circumstances that warrant revised estimates of useful lives or that indicate that impairment exists.
	Goodwill is assessed for impairment at least annually at the reporting unit level either qualitatively or quantitatively. If the elected qualitative assessment results indicate that it is more likely than not that there is impairment, then the quantitative impairment test is required. Various valuation methodologies are applied to carry out the first step of the quantitative impairment test by comparing the fair value of the reporting unit to its carrying amount, including goodwill. If the fair value of the reporting unit is less than its carrying amount, a second step is required to measure the amount of impairment by comparing the implied fair value of the goodwill assigned to the reporting unit with the carrying amount of that goodwill. Goodwill impairment is recognized through a direct write down to its carrying amount and subsequent reversals of goodwill impairment are prohibited.
Federal Deposit Insurance Corporation (FDIC) Indemnification Asset	'
	Federal Deposit Insurance Corporation (FDIC) Indemnification Asset
	In conjunction with the FDIC-assisted acquisitions of Frontier and Tamalpais in 2010, the Company entered into loss share agreements with the FDIC. Under the terms of the purchase and assumption and loss share agreements, the FDIC will reimburse the Company for certain losses on the covered assets, subject to specific compliance, servicing, notification and reporting requirements.
	At the date of the acquisitions, the Company recorded an indemnification asset at fair value based on the present value of cash flows expected to be collected from the FDIC under the loss share agreements. Subsequent to acquisition, the indemnification asset is accounted for on the same basis as the related FDIC covered assets and is linked to the losses on those assets. The difference between the carrying amount and the undiscounted cash flows that the Company expects to collect from the FDIC is amortized into noninterest income over the life of the FDIC indemnification asset. Any increases in expected cash flows of covered loans due to decreases in expected credit losses are amortized over the lesser of the contractual term of the FDIC loss share agreement and the remaining life of the indemnified assets. Any decreases in cash flows of the covered loans due to increases in expected credit losses will increase the FDIC indemnification asset and adjust the provision for credit losses. At the date of the acquisitions, the Company also recorded a standalone liability for the FDIC's ability to clawback a portion of the loss share reimbursements paid to the Company. Because such consideration is contingently payable to the FDIC, the Company accounts for this liability as a form of contingent consideration that is recorded at fair value through noninterest expense.
Other Real Estate Owned	'
	Other Real Estate Owned
	Other real estate owned (OREO) represents the collateral acquired through foreclosure in full or partial satisfaction of the related loan. OREO is initially recorded in other assets at the date physical possession is received at the fair value as established by a current appraisal, adjusted for estimated costs to sell the asset. Any write-down on the date of transfer from loan classification is charged to the allowance for loan losses. Subsequently, OREO is measured at the lower of the acquisition date fair value or fair value less estimated costs to sell the asset. OREO values are reviewed on an ongoing basis and subsequent declines in an individual property's fair value are recognized in earnings in the current period or in certain instances as a charge to the allowance for loan losses. The net operating results from these assets are included in the current period in noninterest expense as foreclosed asset expense.
Other Investments	'
	Other Investments
	The Company invests in private equity investments, which include direct investments in private companies. These nonmarketable equity investments are initially recorded at cost and are accounted for using the cost or equity method of accounting depending on whether the Company has significant influence over the investee. Under the equity method, the investment is adjusted for the Company's share of the investee's net income or loss for the period. Under the cost method, dividends received are recognized in other noninterest income, and dividends received in excess of the investee's earnings are considered a return of investment and are recorded as a reduction of investment cost. These investments are evaluated for other-than-temporary impairment if events or conditions indicate that it is probable that the carrying amount of the investment will not be fully recovered in the foreseeable future. If an investment is determined to be other-than-temporarily impaired, it is written down to its fair value through earnings. Fair value is estimated based on a company's business model, current and projected financial performance, liquidity and overall economic and market conditions. As a practical expedient, fair value can also be estimated using the net asset value (NAV) of the fund. All of these investments are included within other assets and any other-than-temporary impairment is recognized in other noninterest income.
	The Company invests in limited liability partnerships and other entities operating qualified affordable housing projects. These low-income housing credit (LIHC) investments provide tax benefits to investors in the form of tax deductions from operating losses and tax credits. The unguaranteed LIHC investments are initially recorded at cost, and the carrying amount is amortized as an expense over the period of available tax credits and tax benefits under the equity method of accounting through noninterest expense. These investments are reviewed periodically for impairment.
	The Company invests in guaranteed LIHC investments where the availability of tax credits are guaranteed by a creditworthy entity. The investments are initially recorded at cost. When certain criteria are met, the investment is amortized over the period the tax credits are allocated to provide a constant effective yield, as a component of income tax expense. In other instances, the carrying amount is amortized through noninterest expense over the period of available tax credits and tax benefits under the equity method of accounting. These investments are reviewed periodically for impairment.
	The Company also invests in limited liability entities and trusts that operate renewable energy projects, either directly or indirectly. Tax credits, taxable income and distributions associated with these renewable energy projects may be allocated to investors according to the terms of the partnership agreements. These investments are accounted for under the equity method and are reviewed periodically for impairment, considering projected operating results and realizability of tax credits.
Derivative Instruments Used in Hedging Relationships	'
	Derivative Instruments Used in Hedging Relationships
	The Company enters into a variety of derivative contracts as a means of managing the Company's interest rate exposure and designates such derivatives under qualifying hedge relationships. All such derivative instruments are recorded at fair value and are included in other assets or other liabilities, taking into consideration the effects of legally enforceable master netting agreements that allow the Company to settle positive and negative positions and offset cash collateral with the same counterparty on a net basis in the event of bankruptcy.
	At hedge inception, the Company designates a derivative instrument as: a hedge of the fair value of a recognized asset or liability (i.e., fair value hedge), or a hedge of the variability in the expected future cash flows associated with an existing recognized asset or liability or a probable forecasted transaction (i.e., cash flow hedge).
	Where hedge accounting is applied, the Company formally documents, at hedge inception, its risk management objective and strategy for undertaking the hedge, which includes identification of the hedging instrument, the hedged item or transaction, the nature of the risk being hedged, and how the hedge's effectiveness will be assessed. Both at the inception of the hedge and on an ongoing basis, the hedging relationship must be expected to be highly effective in achieving offsetting cash flows or offsetting changes in fair value attributed to the hedged risk during the hedge period in order to qualify for hedge accounting.
	When measuring qualifying cash flow hedges for effectiveness, only ineffectiveness resulting from over-hedging is recorded in earnings as an adjustment to noninterest expense, with other changes in fair value recognized in other comprehensive income. Amounts realized on cash flow hedges related to variable rate loans, deposit liabilities and borrowings are recognized in net interest income in the period in which the cash flow from the hedged item is recognized in earnings. The fair value of cash flow hedges related to forecasted transactions is recognized as an adjustment to the carrying amount of the asset or liability in the period when the forecasted transaction occurs or in noninterest expense if the forecasted transaction no longer is expected to occur. For fair value hedges, any ineffectiveness is recognized in noninterest expense in the period in which it arises. For fair value hedges of interest bearing assets or liabilities, the change in the fair value of the hedged item and the hedging instrument, to the extent completely effective, offsets with no impact on earnings. If a derivative instrument is no longer determined to be highly effective as a designated hedge, hedge accounting is discontinued and subsequent fair value adjustments of the derivative instrument are recorded in earnings.
Transfers of Financial Assets	'
	Transfers of Financial Assets
	Transfers of financial assets in which the Company has surrendered control over the transferred assets are accounted for as sales. Control is generally considered to have been surrendered when the transferred assets have been legally isolated from the Company, the transferee has the right to pledge or exchange the assets without any significant constraints, and the Company has not entered into a repurchase agreement, does not hold significant call options and has not written significant put options on the transferred assets. In assessing whether control has been surrendered, the Company considers whether the transferee would be a consolidated affiliate and the impact of all arrangements or agreements made contemporaneously with, or in contemplation of, the transfer, even if they were not entered into at the time of transfer.
Operating Leases	'
	Operating Leases
	The Company enters into a variety of lease contracts generally for premises and equipment as a lessee. Lease contracts that do not transfer substantially all of the benefits and risks of ownership and do not meet the accounting requirements for capital lease classification are treated as operating leases. The Company accounts for the payments of rent on these contracts on a straight-line basis over the lease term. At inception of the lease term, any periods for which no rents are paid or escalation clauses are stipulated in the lease contract are included in the determination of the rent expense and recognized ratably over the lease term.
	The Company records liabilities for legal obligations associated with the future retirement of buildings and leasehold improvements at fair value when incurred. The assets are increased by the related liability and depreciated over the estimated useful life of that asset.
Income Taxes	'
	Income Taxes
	The Company files consolidated U.S. federal income tax returns, foreign tax returns and various combined and separate company state income tax returns.
	Management evaluates two components of income tax expense: current and deferred. Current income tax expense approximates taxes to be paid or refunded for the current period and includes income tax expense related to the Company's uncertain tax positions. Management determines deferred income taxes using the balance sheet method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and recognizes enacted changes in tax rates and laws in the period in which they occur. Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are recognized subject to management's judgment that realization is more likely than not. A tax position that meets the "more likely than not" recognition threshold is measured to determine the amount of benefit to recognize. The tax position is measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement. Foreign taxes paid are generally applied as credits to reduce U.S. federal income taxes payable. Interest and penalties are recognized as a component of income tax expense.
Employee Pension and Other Postretirement Benefits	'
	Employee Pension and Other Postretirement Benefits
	The Company provides a variety of pension and other postretirement benefit plans for eligible employees and retirees. Provisions for the costs of these employee pension and other postretirement benefit plans are accrued and charged to expense when the benefit is earned.
Stock-Based Compensation	'
	Stock-Based Compensation
	The Company grants restricted stock units settled in American Depositary Receipts (ADRs) representing shares of common stock of the Company's ultimate parent company, Mitsubishi UFJ Financial Group, Inc. (MUFG), to employees. Stock-based compensation is measured at fair value on the grant date and is recognized in the Company's results of operations on a straight-line basis over the vesting period. The amortization of stock-based compensation reflects estimated forfeitures adjusted for actual forfeitures experience.
Business Combinations	'
	Business Combinations
	The Company accounts for all business combinations using the acquisition method of accounting. Except for certain transactions between entities under common control, assets and liabilities acquired are recorded at fair value at the acquisition date, with the excess of purchase price over the fair value of the net assets acquired (including identifiable intangibles) recorded as goodwill. Management may further adjust the acquisition date fair values for a period of up to one year from the date of acquisition. The recognition at the acquisition date of an allowance for loan losses is not carried over or recorded as of acquisition date, as credit-related factors are incorporated directly into the fair value measurement of the loans.
Recently Issued Accounting Pronouncements That Are Not Yet Effective	'
	Recently Issued Accounting Pronouncements That Are Not Yet Effective
	Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date
	In February 2013, the Financial Accounting Standards Board (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 does not expect the adoption of this guidance to significantly impact the Company's financial position or 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.
	Investment Companies—Amendments to the Scope, Measurement, and Disclosure Requirements
	In June 2013, the FASB issued ASU 2013-08, Financial Services—Investment Companies (Topic 946)—Amendments to the Scope, Measurement, and Disclosure Requirements, which changes the criteria for determining whether an entity meets the definition of an investment company, requires investment companies to measure noncontrolling ownership interests in other investment companies at fair value (rather than using the equity method of accounting), and requires additional disclosures for investment companies. This guidance is effective for interim and annual periods beginning on January 1, 2014. The revised investment company accounting must be applied to all entities that meet the new investment company definition on the effective date, with a cumulative effect adjustment to beginning retained earnings. Management does not expect the adoption of this guidance to significantly impact the Company's financial position or results of operations.
	Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
	In July 2013, the FASB issued ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, which specifies that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. However, to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available to settle any additional income taxes that would result from the disallowance of a tax position, or the tax law of the applicable jurisdiction does not require the entity to use the deferred tax asset for such purpose, the unrecognized tax benefit should be presented as a liability. This guidance is applied prospectively beginning on January 1, 2014 to all unrecognized tax benefits that exist on that date, with retrospective application permitted. Early adoption is also permitted. Management does not expect the adoption of this guidance to significantly impact the Company's financial position or results of operations.
	Accounting for Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB issued ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, which amends guidance on the accounting for investments in qualified affordable housing projects and permits reporting entities to make an accounting policy election to account for investments in qualified affordable housing projects using the proportional amortization method, if certain conditions are met. Under the proportional amortization method, reporting entities amortize the initial cost of the investment in proportion to tax credits and tax benefits received and recognize the amortization as a component of income tax expense. This guidance is effective for public entities for annual periods and interim reporting periods therein, beginning after December 15, 2014, with early adoption permitted. The guidance is required to be applied retrospectively to all periods presented. Management is currently assessing the impact of this guidance on the Company's financial position and results of operations, and expects to adopt the standard in 2014.
	Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
	In January 2014, the FASB issued ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, which provides guidance on when an in substance repossession or foreclosure of residential real estate has occurred and when a creditor should derecognize the consumer mortgage loan and recognize the residential real estate. The guidance clarifies that an in-substance repossession or foreclosure occurs upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure, or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. In addition, the standard requires additional interim and annual disclosures. The guidance is effective for interim and annual periods beginning on January 1, 2015, with early adoption permitted. Management does not expect the adoption of this guidance to significantly impact the Company's financial position or results of operations.

Correction_of_Prior_Period_Amo1

Correction of Prior Period Amounts (Tables)	12 Months Ended
	Dec. 31, 2013
Correction of Prior Period Amounts	'
Schedule of affected line items on the consolidated statements of income	'
		For the Year Ended							For the Year Ended
		December 31, 2012							December 31, 2011
	(Dollars in millions)	As Previously		Adjustment			As		As Previously		Adjustment			As
		Reported					Corrected		Reported					Corrected
	Net interest income
	Interest expense—deposits	$	233	$	(19	)	$	214	$	216	$	(12	)	$	204
	Noninterest income
	Trading account activities		115		(14	)		101		126		(29	)		97
	Brokerage commissions and fees		44		(5	)		39		47		(8	)		39
	Income before income taxes and including noncontrolling interests		830		(1	)		829		1,081		(26	)		1,055
	Net Income Attributable to UNBC		629		(1	)		628		778		(16	)		762
Schedule of affected line items on the consolidated balance sheet and statement of changes in stockholder's equity	'
		December 31, 2012
	(Dollars in millions)	As Previously		Adjustment			As
		Reported					Corrected
	Other assets	$	4,805	$	16		$	4,821
	Interest bearing deposits		48,777		49			48,826
	Other liabilities		2,102		(3	)		2,099
	Retained earnings		6,875		(30	)		6,845
		December 31, 2011							December 31, 2010
	(Dollars in millions)	As Previously		Adjustment			As		As Previously		Adjustment			As
		Reported					Corrected		Reported					Corrected
	Retained earnings	$	6,246	$	(29	)	$	6,217	$	5,468	$	(13	)	$	5,455

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations	'
Net Assets Acquired and Purchase Accounting Adjustments	'
	(Dollars in millions)	December 1, 2012
	Purchase price	$	1,516
	Net assets acquired		859
	Purchase accounting adjustments:
	Securities available for sale		8
	Loans held for investment		141
	Intangible assets		18
	Other assets		128
	Deposits		(12	)
	Other short-term borrowings		(36	)
	Long-term debt		(14	)
	Other liabilities		11
	Total purchase accounting adjustments		244
	Fair value of net assets acquired		1,103
	Goodwill	$	413

Securities_Tables

Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Securities	'
Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses, and Fair Values of Securities	'
		December 31, 2013
	(Dollars in millions)	Amortized		Gross		Gross		Fair
		Cost		Unrealized		Unrealized		Value
				Gains		Losses
	Asset Liability Management securities:
	U.S. government-sponsored agencies	$	73	$	—	$	—	$	73
	Residential mortgage-backed securities:
	U.S. government agency and government-sponsored agencies		9,194		2		296		8,900
	Privately issued		220		4		2		222
	Commercial mortgage-backed securities		1,947		8		85		1,870
	Collateralized loan obligations		2,670		25		22		2,673
	Asset-backed and other		34		1		—		35
	Asset Liability Management securities		14,138		40		405		13,773
	Other debt securities:
	Direct bank purchase bonds		1,968		35		43		1,960
	Other		81		—		5		76
	Equity securities		7		1		—		8
	Total securities available for sale	$	16,194	$	76	$	453	$	15,817
		December 31, 2012
	(Dollars in millions)	Amortized		Gross		Gross		Fair
		Cost		Unrealized		Unrealized		Value
				Gains		Losses
	Asset Liability Management securities:
	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
	Collateralized loan obligations		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
Proceeds from Sales of Securities Available for Sale and Gross Realized Gains and Losses	'
		For the Years Ended
		December 31,
	(Dollars in millions)	2013		2012		2011
	Proceeds from sales	$	8,340	$	6,845	$	4,556
	Gross realized gains		190		113		59
	Gross realized losses		3		2		—
Schedule of Held to Maturity Securities Recognized and Not Recognized in Other Comprehensive Income (OCI) and Fair Values	'
		December 31, 2013
				Recognized in						Not Recognized in
				OCI						OCI
	(Dollars in millions)	Amortized		Gross		Gross		Carrying		Gross		Gross		Fair
		Cost		Unrealized		Unrealized		Amount		Unrealized		Unrealized		Value
				Gains		Losses				Gains		Losses
	U.S. government agency and government-sponsored agencies—residential mortgage backed securities	$	5,065	$	7	$	77	$	4,995	$	8	$	69	$	4,934
	Commercial mortgage-backed securities		1,606		—		92		1,514		3		12		1,505
	Total securities held to maturity	$	6,671	$	7	$	169	$	6,509	$	11	$	81	$	6,439
		December 31, 2012
				Recognized in						Not Recognized in
				OCI						OCI
	(Dollars in millions)	Amortized		Gross		Gross		Carrying		Gross		Gross		Fair
		Cost		Unrealized		Unrealized		Amount		Unrealized		Unrealized		Value
				Gains		Losses				Gains		Losses
	U.S. government agency and government-sponsored agencies—residential mortgage backed securities	$	997	$	5	$	—	$	1,002	$	12	$	—	$	1,014
	Collateralized loan obligations		118		—		17		101		20		—		121
	Total securities held to maturity	$	1,115	$	5	$	17	$	1,103	$	32	$	—	$	1,135
Securities Available for Sale	'
Securities	'
Securities in Unrealized Loss Position	'
		December 31, 2013
		Less than 12 months				12 months or more				Total
	(Dollars in millions)	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
		Value		Losses		Value		Losses		Value		Losses
	Asset Liability Management securities:
	Residential mortgage-backed securities:
	U.S. government agency and government-sponsored agencies	$	8,508	$	293	$	147	$	3	$	8,655	$	296
	Privately issued		72		2		18		—		90		2
	Commercial mortgage-backed securities		1,274		80		58		5		1,332		85
	Collateralized loan obligations		1,879		21		10		1		1,889		22
	Asset-backed and other		—		—		1		—		1		—
	Asset Liability Management securities		11,733		396		234		9		11,967		405
	Other debt securities:
	Direct bank purchase bonds		537		18		778		25		1,315		43
	Other		15		1		34		4		49		5
	Equity securities		5		—		—		—		5		—
	Total securities available for sale	$	12,290	$	415	$	1,046	$	38	$	13,336	$	453
		December 31, 2012
		Less than 12 months				12 months or more				Total
	(Dollars in millions)	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
		Value		Losses		Value		Losses		Value		Losses
	Asset Liability Management securities:
	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
	Collateralized loan obligations		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
Debt Securities by Contractual Maturity	'
		December 31, 2013
	(Dollars in millions)	One Year or		Over One Year		Over Five Years		Over Ten Years		Total Fair
		Less		Through		Through				Value
				Five Years		Ten Years
	Asset Liability Management securities:
	U.S. government-sponsored agencies	$	73	$	—	$	—	$	—	$	73
	Residential mortgage-backed securities:
	U.S. government agency and government-sponsored agencies		2		42		602		8,254		8,900
	Privately issued		—		—		6		216		222
	Commercial mortgage-backed securities		—		—		34		1,836		1,870
	Collateralized loan obligations		—		346		547		1,780		2,673
	Asset-backed and other		—		27		8		—		35
	Asset Liability Management securities		75		415		1,197		12,086		13,773
	Other debt securities:
	Direct bank purchase bonds		149		288		1,005		518		1,960
	Other		—		22		14		40		76
	Total debt securities available for sale	$	224	$	725	$	2,216	$	12,644	$	15,809
Securities Held to Maturity	'
Securities	'
Securities in Unrealized Loss Position	'
		December 31, 2013
		Less than 12 months						12 months or more						Total
				Unrealized Losses						Unrealized Losses						Unrealized Losses
	(Dollars in millions)	Fair		Recognized		Not Recognized		Fair		Recognized		Not Recognized		Fair		Recognized		Not Recognized
		Value		in OCI		in OCI		Value		in OCI		in OCI		Value		in OCI		in OCI
	U.S. government agency and government-sponsored agencies—residential mortgage backed securities	$	3,873	$	76	$	68	$	54	$	1	$	1	$	3,927	$	77	$	69
	Commercial mortgage-backed securities		1,016		46		10		489		46		2		1,505		92		12
	Total securities held to maturity	$	4,889	$	122	$	78	$	543	$	47	$	3	$	5,432	$	169	$	81
		December 31, 2012
		Less than 12 months						12 months or more						Total
				Unrealized Losses						Unrealized Losses						Unrealized Losses
	(Dollars in millions)	Fair		Recognized		Not Recognized		Fair		Recognized		Not Recognized		Fair		Recognized		Not Recognized
		Value		in OCI		in OCI		Value		in OCI		in OCI		Value		in OCI		in OCI
	Collateralized loan obligations	$	—	$	—	$	—	$	121	$	17	$	—	$	121	$	17	$	—
Debt Securities by Contractual Maturity	'
		December 31, 2013
		Over One Year				Over Five Years				Over Ten Years				Total
		Through Five Years				Through Ten Years
	(Dollars in millions)	Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value		Amount		Value		Amount		Value
	U.S. government agency and government-sponsored agencies—residential mortgage backed securities	$	4	$	4	$	—	$	—	$	4,991	$	4,930	$	4,995	$	4,934
	Commercial mortgage-backed securities		—		—		835		834		679		671		1,514		1,505
	Total securities held to maturity	$	4	$	4	$	835	$	834	$	5,670	$	5,601	$	6,509	$	6,439

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2013
Loans and Allowance for Loan Losses	'
Summary of Loans	'
		December 31,
	(Dollars in millions)	2013			2012
	Loans held for investment:
	Commercial and industrial	$	23,528		$	20,827
	Commercial mortgage		13,092			9,939
	Construction		905			627
	Lease financing		854			1,104
	Total commercial portfolio		38,379			32,497
	Residential mortgage		25,547			22,705
	Home equity and other consumer loans		3,280			3,647
	Total consumer portfolio		28,827			26,352
	Total loans held for investment, before purchased credit-impaired loans		67,206			58,849
	Purchased credit-impaired loans(1)		1,106			1,185
	Total loans held for investment(2)		68,312			60,034
	Allowance for loan losses		(568	)		(653	)
	Loans held for investment, net	$	67,744		$	59,381
	-1
	Includes $251 million and $421 million as of December 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, $15 million and $24 million as of December 31, 2013 and December 31, 2012, respectively, were not accounted for under accounting guidance for loans acquired with deteriorated credit quality.
	-2
	Includes $88 million and $5 million at December 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	'
		For the Year Ended December 31, 2013
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
								Credit-
								Impaired
	Allowance for loan losses, beginning of period	$	418		$	124		$	1		$	110		$	653
	(Reversal of) provision for loan losses		18			(29	)		—			(33	)		(44	)
	(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification		—			—			(1	)		—			(1	)
	Decrease in allowance covered by FDIC indemnification		—			—			(8	)		—			(8	)
	Loans charged off		(44	)		(30	)		(3	)		—			(77	)
	Recoveries of loans previously charged off		29			4			12			—			45
	Allowance for loan losses, end of period	$	421		$	69		$	1		$	77		$	568
		For the Year Ended December 31, 2012
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
								Credit-
								Impaired
	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 (increase) 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
		For the Year Ended December 31, 2011
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
								Credit-
								Impaired
	Allowance for loan losses, beginning of period	$	683		$	185		$	25		$	298		$	1,191
	(Reversal of) provision for loan losses		(74	)		37			—			(163	)		(200	)
	(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification		—			—			(2	)		—			(2	)
	Decrease (increase) in allowance covered by FDIC indemnification		—			—			(5	)		—			(5	)
	Other(1)		16			—			—			—			16
	Loans charged off		(217	)		(87	)		(3	)		—			(307	)
	Recoveries of loans previously charged off		66			3			2			—			71
	Allowance for loan losses, end of period	$	474		$	138		$	17		$	135		$	764
	-1
	Other includes a $16 million allowance for loan losses transfer attributed to an internal reorganization on October 1, 2011, in which BTMU transferred its trust company, The Bank of Tokyo-Mitsubishi UFJ Trust Company (BTMUT), to the Company.
Allowance for Loan Losses and Related Loan Balances by Portfolio Segment	'
		December 31, 2013
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
								Credit-
								Impaired
	Allowance for loan losses:
	Individually evaluated for impairment	$	19		$	20		$	—		$	—		$	39
	Collectively evaluated for impairment		402			49			—			77			528
	Purchased credit-impaired loans		—			—			1			—			1
	Total allowance for loan losses	$	421		$	69		$	1		$	77		$	568
	Loans held for investment:
	Individually evaluated for impairment	$	266		$	339		$	3		$	—		$	608
	Collectively evaluated for impairment		38,113			28,488			—			—			66,601
	Purchased credit-impaired loans		—			—			1,103			—			1,103
	Total loans held for investment	$	38,379		$	28,827		$	1,106		$	—		$	68,312
		December 31, 2012
	(Dollars in millions)	Commercial			Consumer			Purchased			Unallocated			Total
								Credit-
								Impaired
	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	'
		December 31,
	(Dollars in millions)	2013			2012
	Commercial and industrial	$	44		$	48
	Commercial mortgage		51			65
	Total commercial portfolio		95			113
	Residential mortgage		286			306
	Home equity and other consumer loans		46			56
	Total consumer portfolio		332			362
	Total nonaccrual loans, before purchased credit-impaired loans		427			475
	Purchased credit-impaired loans		15			30
	Total nonaccrual loans	$	442		$	505
	Troubled debt restructured loans that continue to accrue interest	$	367		$	401
	Troubled debt restructured nonaccrual loans (included in the total nonaccrual loans above)	$	225		$	209
Aging of Balance of Loans Held for Investment, Excluding Purchased Credit-Impaired Loans	'
		December 31, 2013
		Aging Analysis of Loans
	(Dollars in millions)	Current			30 to			90 Days or			Total Past Due			Total
					89 Days			More Past
					Past Due			Due
	Commercial and industrial	$	24,310		$	66		$	6		$	72		$	24,382
	Commercial mortgage		13,004			68			20			88			13,092
	Construction		891			14			—			14			905
	Total commercial portfolio		38,205			148			26			174			38,379
	Residential mortgage		25,342			114			91			205			25,547
	Home equity and other consumer loans		3,238			23			19			42			3,280
	Total consumer portfolio		28,580			137			110			247			28,827
	Total loans held for investment, excluding purchased credit-impaired loans	$	66,785		$	285		$	136		$	421		$	67,206
		December 31, 2012
		Aging Analysis of Loans
	(Dollars in millions)	Current			30 to			90 Days or			Total Past Due			Total
					89 Days			More Past
					Past Due			Due
	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 Based on Internal Ratings	'
		December 31, 2013
	(Dollars in millions)	Pass			Special Mention			Classified			Total
	Commercial and industrial	$	23,346		$	576		$	313		$	24,235
	Construction		879			14			—			893
	Commercial mortgage		12,562			142			228			12,932
	Total commercial portfolio		36,787			732			541			38,060
	Purchased credit-impaired loans		48			204			362			614
	Total	$	36,835		$	936		$	903		$	38,674
		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 an Purchased credit-impaired loans	'
		December 31, 2013
	(Dollars in millions)	Accrual			Nonaccrual			Total
	Residential mortgage	$	25,261		$	286		$	25,547
	Home equity and other consumer loans		3,234			46			3,280
	Total consumer portfolio		28,495			332			28,827
	Purchased credit-impaired loans		242			—			242
	Total	$	28,737		$	332		$	29,069
		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
Loans in Consumer Portfolio Segment and Consumer Loans within Purchased Credit-Impaired Loans Segment Monitored for Credit Quality Based on Refreshed FICO Scores and Refreshed LTV ratios	'
		December 31, 2013
		FICO scores
	(Dollars in millions)	720 and Above			Below 720			No FICO			Total
								Available(1)
	Residential mortgage	$	19,614		$	5,301		$	459		$	25,374
	Home equity and other consumer loans		2,283			839			81			3,203
	Total consumer portfolio		21,897			6,140			540			28,577
	Purchased credit-impaired loans		94			135			15			244
	Total	$	21,991		$	6,275		$	555		$	28,821
	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).
		December 31, 2012
		FICO scores
	(Dollars in millions)	720 and Above			Below 720			No FICO			Total
								Available(1)
	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).
		December 31, 2013
		LTV ratios
	(Dollars in millions)	Less than 80			80-100			Greater than			No LTV			Total
		Percent			Percent			100 Percent			Available(1)
	Residential mortgage	$	23,209		$	1,884		$	228		$	53		$	25,374
	Home equity loans		2,487			362			202			52			3,103
	Total consumer portfolio		25,696			2,246			430			105			28,477
	Purchased credit-impaired loans		152			57			31			—			240
	Total	$	25,848		$	2,303		$	461		$	105		$	28,717
	Percentage of total		90	%		8	%		2	%		—	%		100	%
	-1
	Represents loans for which management was not able to obtain refreshed property values.
		December 31, 2012
		LTV ratios
	(Dollars in millions)	Less than 80			80-100			Greater than			No LTV			Total
		Percent			Percent			100 Percent			Available(1)
	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	'
		December 31,
	(Dollars in millions)	2013			2012
	Commercial and industrial	$	212		$	215
	Commercial mortgage		38			64
	Construction		—			35
	Total commercial portfolio		250			314
	Residential mortgage		315			271
	Home equity and other consumer loans		24			21
	Total consumer portfolio		339			292
	Total restructured loans, excluding purchased credit-impaired loans(1)	$	589		$	606
	-1
	Amounts exclude $3 million and $4 million of TDRs covered by FDIC loss share agreements at December 31, 2013 and 2012, respectively.
Pre- and Post-Modification Outstanding Recorded Investment Amounts of Troubled Debt Restructurings	'
		For the Year Ended						For the Year Ended
		December 31, 2013						Decemeber 31, 2012
	(Dollars in millions)	Pre-Modification			Post-Modification			Pre-Modification			Post-Modification
		Outstanding			Outstanding			Outstanding			Outstanding
		Recorded			Recorded			Recorded			Recorded
		Investment(1)			Investment(2)			Investment(1)			Investment(2)
	Commercial and industrial	$	161		$	158		$	154		$	147
	Commercial mortgage		70			69			22			21
	Construction		—			—			7			7
	Total commercial portfolio		231			227			183			175
	Residential mortgage		104			103			159			151
	Home equity and other consumer loans		9			8			31			19
	Total consumer portfolio		113			111			190			170
	Total	$	344		$	338		$	373		$	345
	-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	'
		December 31,
	(Dollars in millions)	2013			2012
	Commercial and industrial	$	10		$	3
	Commercial mortgage		2			1
	Construction		—			15
	Total commercial portfolio		12			19
	Residential mortgage		16			34
	Home equity and other consumer loans		2			—
	Total consumer portfolio		18			34
	Total	$	30		$	53
Information about Impaired Loans by Class	'
		December 31, 2013
		Recorded Investment												Unpaid Principal
														Balance
	(Dollars in millions)	With an			Without an			Total			Allowance			With an			Without an
		Allowance			Allowance						for Impaired			Allowance			Allowance
											Loans
	Commercial and industrial	$	117		$	104		$	221		$	16		$	121		$	114
	Commercial mortgage		33			12			45			3			36			15
	Total commercial portfolio		150			116			266			19			157			129
	Residential mortgage		220			95			315			20			236			108
	Home equity and other consumer loans		4			20			24			—			4			34
	Total consumer portfolio		224			115			339			20			240			142
	Total, excluding purchased credit-impaired loans		374			231			605			39			397			271
	Purchased credit-impaired loans		2			1			3			—			2			6
	Total	$	376		$	232		$	608		$	39		$	399		$	277
		December 31, 2012
		Recorded Investment												Unpaid Principal
														Balance
	(Dollars in millions)	With an			Without an			Total			Allowance			With an			Without an
		Allowance			Allowance						for Impaired			Allowance			Allowance
											Loans
	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	'
		Years Ended December 31,
		2013						2012						2011
	(Dollars in millions)	Average			Recognized			Average			Recognized			Average			Recognized
		Recorded			Interest			Recorded			Interest			Recorded			Interest
		Investment			Income			Investment			Income			Investment			Income
	Commercial and industrial	$	243		$	14		$	201		$	12		$	185		$	6
	Commercial mortgage		53			9			107			1			191			1
	Construction		8			3			44			2			56			3
	Total commercial portfolio		304			26			352			15			432			10
	Residential mortgage		293			10			221			8			117			6
	Home equity and other consumer loans		22			1			7			1			2			—
	Total consumer portfolio		315			11			228			9			119			6
	Total, excluding purchased credit-impaired loans		619			37			580			24			551			16
	Purchased credit-impaired loans		4			—			8			1			16			1
	Total	$	623		$	37		$	588		$	25		$	567		$	17
Outstanding Balances and Carrying Amounts of Purchased Credit-Impaired Loans	'
	(Dollars in millions)	December 31,			December 31,
		2013			2012
	Total outstanding balance	$	1,733		$	2,155
	Carrying amount		1,091			1,161
Changes in Accretable Balance for Purchased Credit-Impaired Loans	'
		For the Years Ended
		December 31,
	(Dollars in millions)	2013			2012			2011
	Accretable yield, beginning of period	$	590		$	424		$	231
	Additions		31			171			—
	Accretion		(336	)		(297	)		(192	)
	Reclassifications from nonaccretable difference during the period		93			292			385
	Accretable yield, end of period	$	378		$	590		$	424

Premises_and_Equipment_and_Oth1

Premises and Equipment and Other Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Premises and Equipment and Other Assets	'
Premises and Equipment at Carried Cost, Less Accumulated Depreciation and Amortization	'
		December 31,
		2013							2012
	(Dollars in millions)	Cost		Accumulated			Net Book		Cost		Accumulated			Net Book
				Depreciation and			Value				Depreciation and			Value
				Amortization							Amortization
	Land	$	154	$	(—	)	$	154	$	155	$	(—	)	$	155
	Premises		621		(328	)		293		689		(386	)		303
	Leasehold improvements		298		(218	)		80		342		(242	)		100
	Furniture, fixtures and equipment		670		(509	)		161		709		(557	)		152
	Total	$	1,743	$	(1,055	)	$	688	$	1,895	$	(1,185	)	$	710
Rental, Depreciation and Amortization Expenses	'
		Years Ended December 31,
	(Dollars in millions)	2013		2012			2011
	Rental expense of premises	$	111	$	85		$	86
	Less: rental income		9		8			8
	Net rental expense	$	102	$	77		$	78
	Depreciation and amortization of premises and equipment	$	110	$	102		$	101
Future Minimum Lease Payments	'
	(Dollars in millions)	2013
	Years ending December 31,:
	2014	$	111
	2015		107
	2016		99
	2017		87
	2018		73
	Thereafter		229
	Total minimum lease payments	$	706
	Minimum rental income due in the future under subleases	$	2
Schedule of other assets	'
	(Dollars in millions)	December 31,		December 31,
		2013		2012
	Other investments	$	2,211	$	1,574
	Prepaid expenses		509		173
	Intangible assets		290		376
	OREO		57		111
	Other		1,787		2,587
	Total other assets	$	4,854	$	4,821

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Other Intangible Assets	'
Changes in Carrying Amount of Goodwill	'
	The changes in the carrying amount of goodwill during 2013 and 2012 are shown in the table below.
	(Dollars in millions)	2013		2012
	Goodwill, beginning of year	$	2,942	$	2,457
	Net change from business combinations		286		485
	Goodwill, end of year	$	3,228	$	2,942
	For impairment testing, goodwill was assigned to the following operating segments at December 31, 2013:
	(Dollars in millions)	2013
	Retail Banking & Wealth Markets	$	1,527
	Commercial Banking		1,034
	Corporate Banking		149
	Transaction Banking		251
	Investment Banking & Markets		253
	Asian Corporate Banking		14
	Goodwill, end of year	$	3,228
	For impairment testing, goodwill was assigned to the following operating segments at December 31, 2012:
	(Dollars in millions)	2012
	Retail Banking	$	1,474
	Corporate Banking		1,454
	Pacific Rim		14
	Goodwill, end of year	$	2,942
Identifiable Intangible Assets and Accumulated Amortization	'
		December 31, 2013							December 31, 2012
	(Dollars in millions)	Gross		Accumulated			Net		Gross		Accumulated			Net
		Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
		Amount					Amount		Amount					Amount
	Core deposit intangibles	$	667	$	(530	)	$	137	$	669	$	(479	)	$	190
	Trade names		114		(16	)		98		114		(12	)		102
	Customer relationships		63		(22	)		41		75		(17	)		58
	Other		25		(11	)		14		23		(6	)		17
	Subtotal—intangibles with a definite useful life		869		(579	)		290		881		(514	)		367
	Other intangibles with an indefinite useful life		—		—			—		9		—			9
	Total intangibles	$	869	$	(579	)	$	290	$	890	$	(514	)	$	376
Estimated Future Amortization Expense	'
	(Dollars in millions)	Core Deposit		Trade Name			Customer		Other		Total Identifiable
		Intangibles (CDI)					Relationships				Intangible Assets
	Years ending December 31, :
	2014	$	39	$	4		$	5	$	3	$	51
	2015		30		3			5		3		41
	2016		18		3			5		3		29
	2017		14		3			5		2		24
	2018		7		3			4		1		15
	Thereafter		29		82			17		2		130
	Total estimated amortization expense	$	137	$	98		$	41	$	14	$	290

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2013
Consolidated VIEs	'
Variable Interest Entities	'
Schedule of assets and liabilities of VIEs	'
		December 31, 2013
		Consolidated Assets								Consolidated Liabilities
	(Dollars in millions)	Interest Bearing		Loans Held for		Other Assets		Total Assets		Long-Term		Total
		Deposits in		Investment, net						Debt		Liabilities
		Banks
	LIHC investments	$	9	$	—	$	262	$	271	$	4	$	4
	Leasing investments		1		750		8		759		—		—
	Total consolidated VIEs	$	10	$	750	$	270	$	1,030	$	4	$	4
Unconsolidated VIEs	'
Variable Interest Entities	'
Schedule of assets and liabilities of VIEs	'
		December 31, 2013
		Unconsolidated Assets								Unconsolidated Liabilities
	(Dollars in millions)	Securities		Loans Held for		Other Assets		Total Assets		Other		Total		Maximum
		Available for		Investment						Liabilities		Liabilities		Exposure to
		Sale												Loss
	LIHC investments	$	122	$	158	$	1,000	$	1,280	$	445	$	445	$	1,280
	Leasing investments		—		—		704		704		—		—		704
	Other investments		—		15		12		27		—		—		27
	Total unconsolidated VIEs	$	122	$	173	$	1,716	$	2,011	$	445	$	445	$	2,011

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2013
Deposits	'
Maturity Information of Time Deposits with Remaining Term of Greater Than One Year	'
	(Dollars in millions)	December 31,
		2013
	Due after one year through two years	$	1,023
	Due after two years through three years		1,291
	Due after three years through four years		998
	Due after four years through five years		794
	Due after five years		44
	Total	$	4,150

Commercial_Paper_and_Other_Sho1

Commercial Paper and Other Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2013
Commercial Paper and Other Short-Term Borrowings	'
Summary of Commercial Paper and Other Short-Term Borrowings	'
	(Dollars in millions)	December 31,			December 31,
		2013			2012
	Federal funds purchased and securities sold under repurchase agreements with weighted average interest rates of 0.07% and 0.96% at December 31, 2013 and December 31, 2012, respectively	$	39		$	123
	Commercial paper, with weighted average interest rates of 0.19% and 0.20% at December 31, 2013 and December 31, 2012, respectively		2,524			1,240
	Total commercial paper and other short-term borrowings	$	2,563		$	1,363
	Federal funds purchased and securities sold under repurchase agreements:
	Maximum outstanding at any month end	$	359		$	1,471
	Average balance during the year		263			441
	Weighted average interest rate during the year		0.12	%		0.21	%
	Commercial paper:
	Maximum outstanding at any month end	$	3,655		$	2,837
	Average balance during the year		2,393			1,981
	Weighted average interest rate during the year		0.18	%		0.27	%
	Other borrowed funds:
	Federal Home Loan Bank borrowings:
	Maximum outstanding at any month end	$	—		$	2,500
	Average balance during the year		—			739
	Weighted average interest rate during the year		—	%		0.27	%
	Term federal funds purchased:
	Maximum outstanding at any month end	$	269		$	270
	Average balance during the year		50			51
	Weighted average interest rate during the year		0.15	%		0.18	%
	All other borrowed funds:
	Maximum outstanding at any month end	$	—		$	36
	Average balance during the year		45			42
	Weighted average interest rate during the year		1.71	%		0.89	%

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Long-Term Debt	'
Summary of Long-Term Debt	'
	(Dollars in millions)	December 31,		December 31,
		2013		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		—		406
	Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 1.63% at December 31, 2013		300		—
	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 2.60% at December 31, 2013 and 2.66% at December 31, 2012		66		66
	Total debt issued by UnionBanCal Corporation		763		869
	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 February 2015 to February 2016. These notes bear a combined weighted-average rate of 2.55% at December 31, 2013 and 1.39% at December 31, 2012	$	800	$	2,100
	Fixed rate 2.125% notes due December 2013		—		399
	Floating rate notes due June 2014. These notes, which bear interest at 0.95% above 3-month LIBOR, had a rate of 1.19% at December 31, 2013 and 1.26% at December 31, 2012		300		300
	Fixed rate 3.00% notes due June 2016		699		699
	Fixed rate 1.50% notes due September 2016		499		—
	Floating rate notes due September 2016. These notes, which bear interest at 0.75% above 3-month LIBOR, had a rate of 1.00% at December 31, 2013		500		—
	Fixed rate 2.125% notes due June 2017		499		499
	Fixed rate 2.625% notes due September 2018		1,000		—
	Note payable:
	Fixed rate 6.03% notes due July 2014 (related to consolidated VIE)		4		6
	Subordinated debt:
	Fixed rate 5.95% notes due May 2016		718		729
	Subordinated debt due to BTMU:
	Floating rate subordinated debt due June 2023. This note, which bears interest at 1.2% above 3-month LIBOR, had a rate of 1.45% at December 31, 2013		750		—
	Capital lease obligations with a combined weighted average interest rate of 4.88% at December 31, 2013 and 4.72% at December 31, 2012(1)		15		21
	Total debt issued by Union Bank, N.A. and other subsidiaries		5,784		4,753
	Total long-term debt	$	6,547	$	5,622
	-1
	Long-term debt assumed through PCBC acquisition

Fair_Value_Measurement_and_Fai1

Fair Value Measurement and Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Measurement and Fair Value of Financial Instruments	'
Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis	'
		December 31, 2013
	(Dollars in millions)	Level 1			Level 2			Level 3			Netting			Fair Value
											Adjustment(1)
	Assets
	Trading account assets:
	U.S. Treasury	$	—		$	8		$	—		$	—		$	8
	U.S. government-sponsored agencies		—			116			—			—			116
	State and municipal		—			5			—			—			5
	Other loans		—			140			—			—			140
	Interest rate derivative contracts		1			705			7			(212	)		501
	Commodity derivative contracts		—			67			9			(66	)		10
	Foreign exchange derivative contracts		1			30			2			(18	)		15
	Equity derivative contracts		—			—			253			(197	)		56
	Total trading account assets		2			1,071			271			(493	)		851
	Securities available for sale:
	U.S. government-sponsored agencies		—			73			—			—			73
	Residential mortgage-backed securities:
	U.S. government and government-sponsored agencies		—			8,900			—			—			8,900
	Privately issued		—			222			—			—			222
	Commercial mortgage-backed securities		—			1,870			—			—			1,870
	Collateralized loan obligations		—			2,673			—			—			2,673
	Asset-backed and other		—			35			—			—			35
	Other debt securities:
	Direct bank purchase bonds		—			—			1,960			—			1,960
	Other		—			18			58			—			76
	Equity securities		8			—			—			—			8
	Total securities available for sale		8			13,791			2,018			—			15,817
	Other assets:
	Interest rate hedging contracts		—			8			—			—			8
	Other derivative contracts		—			1			1			—			2
	Total other assets		—			9			1			—			10
	Total assets	$	10		$	14,871		$	2,290		$	(493	)	$	16,678
	Percentage of Total		—	%		89	%		14	%		(3	)%		100	%
	Percentage of Total Company Assets		—	%		14	%		2	%		—	%		16	%
	Liabilities
	Trading account liabilities:
	Interest rate derivative contracts	$	3		$	606		$	—		$	(379	)	$	230
	Commodity derivative contracts		—			53			8			(33	)		28
	Foreign exchange derivative contracts		1			26			2			(11	)		18
	Equity derivative contracts		—			—			254			—			254
	Securities sold, not yet purchased		—			10			—			—			10
	Total trading account liabilities		4			695			264			(423	)		540
	Other liabilities:
	FDIC clawback liability		—			—			96			—			96
	Interest rate hedging contracts		—			13			—			—			13
	Other derivative contracts		—			1			3			—			4
	Total other liabilities		—			14			99			—			113
	Total liabilities	$	4		$	709		$	363		$	(423	)	$	653
	Percentage of Total		1	%		109	%		55	%		(65	)%		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			Fair Value
											Adjustment(1)
	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. 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
Collateralized loan obligations		—			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	'
		For the Years Ended
		December 31, 2013															December 31, 2012
	(Dollars in millions)	Trading			Securities			Other			Trading			Other			Trading			Securities			Trading			Other
		Assets			Available for			Assets			Liabilities			Liabilities			Assets			Available for			Liabilities			Liabilities
					Sale															Sale
	Asset (liability) balance, beginning of period	$	136		$	1,499		$	—		$	(136	)	$	(95	)	$	—		$	48		$	—		$	(51	)
	Total gains (losses) (realized/unrealized):
	Included in income before taxes		119			—			—			(120	)		(4	)		(18	)		—			18			(41	)
	Included in other comprehensive income		—			28			—			—			—			—			(35	)		—			—
	Purchases/additions		24			700			1			—			—			8			1,619			—			(3	)
	Sales		—			(14	)		—			(16	)		—			—			—			(8	)		—
	Settlements		(8	)		(195	)		—			8			—			(7	)		(133	)		7			—
	Transfers into Level 3		—			—			—			—			—			153			—			(153	)		—
	Asset (liability) balance, end of period	$	271		$	2,018		$	1		$	(264	)	$	(99	)	$	136		$	1,499		$	(136	)	$	(95	)
	Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	119		$	—		$	—		$	(120	)	$	(4	)	$	(18	)	$	—		$	18		$	(41	)
Significant Unobservable Inputs Level 3 Assets and Liabilities	'
		December 31, 2013
	(Dollars in millions)	Level 3			Valuation Technique(s)		Significant Unobservable		Range of Inputs			Weighted
		Fair Value					Input(s)					Average
	Securities available for sale:
	Direct bank purchase bonds	$	1,960		Return on equity		Market-required return on capital			8.0 - 10.0	%		9.7	%
							Probability of default			0.0 - 25.0	%		0.6	%
							Loss severity			10.0 - 75.0	%		32.8	%
	Other liabilities:
	FDIC clawback liability	$	96		Discounted cash flow		Probability of default			0.1 - 100.0	%		60.4	%
							Loss severity			0.0 - 100.0	%		39.5	%
Financial Assets Measured at Fair Value on Nonrecurring Basis	'
		December 31, 2013
														Loss for the
														Year Ended
														December 31,
	(Dollars in millions)	Fair			Level 1			Level 2			Level 3			2013
		Value
	Loans:
	Impaired loans	$	59		$	—		$	—		$	59		$	(47	)
	Other assets:
	OREO		21			—			—			21			(11	)
	Private equity investments		—			—			—			—			(5	)
	Total	$	80		$	—		$	—		$	80		$	(63	)
		December 31, 2012
														Loss for the
														Year Ended
														December 31,
	(Dollars in millions)	Fair			Level 1			Level 2			Level 3			2012
		Value
	Loans:
	Impaired loans	$	119		$	—		$	—		$	119		$	(88	)
	Other assets:
	OREO		53			—			—			53			(27	)
	Private equity investments		—			—			—			—			(2	)
	Total	$	172		$	—		$	—		$	172		$	(117	)
Carrying Amount and Estimated Fair Value of Financial Instruments	'
		December 31, 2013
	(Dollars in millions)	Carrying			Fair			Level 1			Level 2			Level 3
		Amount			Value
	Assets
	Cash and cash equivalents	$	6,203		$	6,203		$	6,203		$	—		$	—
	Securities held to maturity		6,509			6,439			—			6,439			—
	Loans held for investment, net of allowance for loan losses(1)		66,898			68,132			—			—			68,132
	FDIC indemnification asset		141			95			—			—			95
	Other assets		3			3			—			—			3
	Liabilities
	Deposits	$	80,101		$	80,228		$	—		$	80,228		$	—
	Commercial paper and other short-term borrowings		2,563			2,563			—			2,563			—
	Long-term debt		6,547			6,709			—			6,709			—
	Off-Balance Sheet Instruments
	Commitments to extend credit and standby and commercial letters of credit	$	273		$	273		$	—		$	—		$	273
	-1
	Excludes lease financing, net of related allowance.
		December 31, 2012
	(Dollars in millions)	Carrying			Fair			Level 1			Level 2			Level 3
		Amount			Value
	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	$	74,304		$	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.

Derivative_Instruments_and_Oth1

Derivative Instruments and Other Financial Instruments Used For Hedging (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Other Financial Instruments Used For Hedging	'
Notional Amounts, Balance Sheet Location and Fair Value Amounts of Derivative Instruments	'
		December 31, 2013							December 31, 2012
				Fair Value								Fair Value
	(Dollars in millions)	Notional		Asset		Liability			Notional			Asset			Liability
		Amount		Derivatives		Derivatives			Amount			Derivatives			Derivatives
	Cash flow hedges
	Interest rate contracts	$	4,300	$	8	$	13		$	8,400		$	28		$	—	-1
	Not designated and qualifying as hedging instruments:
	Trading
	Interest rate contracts		44,427		713		609			37,790			1,075			1,009
	Commodity contracts		5,714		76		61			5,595			167			140
	Foreign exchange contracts		5,645		33		29			4,593			69			65
	Equity contracts		4,027		253		254			3,631			103			103
	Other contracts		140		—		—			—			—			—
	Total Trading		59,953		1,075		953			51,609			1,414			1,317
	Other risk management		185		2		4			109			1			3
	Total derivative instruments	$	64,438	$	1,085	$	970		$	60,118		$	1,443		$	1,320
	-1
	Amount recongized was less than $1 million.
Amount and Location of Gains and Losses for Derivatives Designated as Cash Flow Hedges	'
		Amount of Gain (Loss)				Gain (Loss) Reclassified from								Gain (Loss) Recognized in Income
		Recognized in OCI on				Accumulated OCI								on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing)
		Derivative Instruments				into Income (Effective Portion)
		(Effective Portion)
		For the Years Ended						For the Years Ended								For the Years Ended
		December 31,						December 31,								December 31,
	(Dollars in millions)	2013		2012		Location		2013			2012			Location		2013		2012
	Derivatives in cash flow hedging relationships
						Interest income		$	44		$	17
	Interest rate contracts	$	29	$	82	Interest expense			(1	)		(2	)	Noninterest expense(1)		$	—	$	—
	Total	$	29	$	82			$	43		$	15				$	—	$	—
	-1
	Amount recognized was less than $1 million.
Gain or (Loss) Recognized in Income on Derivative Instruments	'
		Gain (Loss) Recognized in Income on
		Derivative Instruments
		For the Years Ended
	(Dollars in millions)	December 31, 2013		December 31, 2012
	Trading derivatives:
	Interest rate contracts	$	30	$	56
	Equity contracts		—		14
	Foreign exchange contracts		18		22
	Commodity contracts		2		5
	Total	$	50	$	97
Summary of Offsetting Assets and Liabilities	'
		December 31, 2013
									Gross Amounts Not Offset in
									Balance Sheet
	(Dollars in millions)	Gross Amounts		Gross Amounts		Net Amounts			Financial			Cash Collateral			Net Amount
		of Recognized		Offset in		Presented in			Instruments			Received/Pledged
		Assets/Liabilities		Balance Sheet		Balance Sheet
	Financial Assets:
	Derivative assets	$	1,085	$	493	$	592		$	79		$	—		$	513
	Securities purchased under resale agreements		10		—		10			10			—			—
	Total	$	1,095	$	493	$	602		$	89		$	—		$	513
	Financial Liabilities:
	Derivative liabilities	$	970	$	423	$	547		$	144		$	—		$	403
	Securities sold under repurchase agreements		8		—		8			8			—			—
	Total	$	978	$	423	$	555		$	152		$	—		$	403
		December 31, 2012
									Gross Amounts Not Offset in Balance Sheet
	(Dollars in millions)	Gross Amounts		Gross Amounts		Net Amounts			Financial			Cash Collateral			Net Amount
		of Recognized		Offset in		Presented in			Instruments			Received/Pledged
		Assets/Liabilities		Balance Sheet		Balance Sheet
	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

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Loss	'
Components of Accumulated Other Comprehensive Loss	'
	(Dollars in millions)	Before			Tax			Net of
		Tax			Effect			Tax
		Amount
	For the Year Ended December 31, 2011:
	Cash flow hedge activities:
	Unrealized net gains (losses) on hedges arising during the period	$	(5	)	$	2		$	(3	)
	Less: Reclassification adjustment for net (gains) losses on hedges included in net income		11			(4	)		7
	Net change		6			(2	)		4
	Securities:
	Unrealized holding gains (losses) arising during the period on securities available for sale		204			(80	)		124
	Reclassification adjustment for net (gains) losses on securities available for sale included in net income		(58	)		23			(35	)
	Less: accretion of fair value adjustment on securities available for sale		(5	)		2			(3	)
	Less: accretion of fair value adjustment on held to maturity securities		(29	)		11			(18	)
	Less: amortization of net unrealized (gains) losses on held to maturity securities		104			(41	)		63
	Net change		216			(85	)		131
	Foreign currency translation adjustment		(1	)		—			(1	)
	Pension and other benefits:
	Amortization of transition amount		1			—			1
	Recognized net actuarial gain (loss)(1)		51			(20	)		31
	Pension and other benefits arising during the year		(491	)		193			(298	)
	Net change(1)		(439	)		173			(266	)
	Net change in accumulated other comprehensive loss	$	(218	)	$	86		$	(132	)
	For the Year Ended December 31, 2012:
	Cash flow hedge activities:
	Unrealized net gains (losses) on hedges arising during the period	$	82		$	(32	)	$	50
	Less: Reclassification adjustment for net (gains) losses on hedges included in net income		(15	)		6			(9	)
	Net change		67			(26	)		41
	Securities:
	Unrealized holding gains (losses) arising during the period on securities available for sale		187			(74	)		113
	Reclassification adjustment for net (gains) losses on securities available for sale included in net income		(107	)		42			(65	)
	Reclassification of unrealized (gains) losses on held to maturity securities transferred to securities available for sale		301			(118	)		183
	Less: accretion of fair value adjustment on securities available for sale		(9	)		4			(5	)
	Less: accretion of fair value adjustment on held to maturity securities		(24	)		9			(15	)
	Less: amortization of net unrealized (gains) losses on held to maturity securities		90			(35	)		55
	Net change		438			(172	)		266
	Foreign currency translation adjustment		2			(1	)		1
	Pension and other benefits:
	Amortization of transition amount		1			(1	)		—
	Recognized net actuarial gain (loss)(1)		99			(39	)		60
	Pension and other benefits arising during the year		(121	)		48			(73	)
	Net change(1)		(21	)		8			(13	)
	Net change in accumulated other comprehensive loss	$	486		$	(191	)	$	295
	For the Year Ended December 31, 2013:
	Cash flow hedge activities:
	Unrealized net gains (losses) on hedges arising during the period	$	29		$	(11	)	$	18
	Less: Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt		(43	)		17			(26	)
	Net change		(14	)		6			(8	)
	Securities:
	Unrealized holding gains (losses) arising during the period on securities available for sale		(401	)		157			(244	)
	Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net		(178	)		70			(108	)
	Less: accretion of fair value adjustment on securities available for sale		(75	)		30			(45	)
	Less: accretion of fair value adjustment on held to maturity securities		(12	)		5			(7	)
	Less: amortization of net unrealized (gains) losses on held to maturity securities		(137	)		54			(83	)
	Net change		(803	)		316			(487	)
	Foreign currency translation adjustment		(7	)		3			(4	)
	Pension and other benefits:
	Recognized net actuarial gain (loss)(1)		116			(46	)		70
	Pension and other benefits arising during the year		526			(207	)		319
	Net change(1)		642			(253	)		389
	Net change in accumulated other comprehensive loss	$	(182	)	$	72		$	(110	)
	-1
	These amounts are included in the computation of net periodic pension cost. For further information, see Note 16 to these consolidated financial statements.
Change in Accumulated Other Comprehensive Loss Balances	'
	(Dollars in millions)	Net			Net			Foreign			Pension and			Accumulated
		Unrealized			Unrealized			Currency			Other			Other
		Gains (Losses)			Gains (Losses)			Translation			Benefits			Comprehensive
		on Cash			on Securities			Adjustment			Adjustment			Loss
		Flow
		Hedges
	Balance, December 31, 2010	$	(21	)	$	(238	)	$	1		$	(419	)	$	(677	)
	Other comprehensive income before reclassifications		(3	)		166			(1	)		—			162
	Amounts reclassified from accumulated other comprehensive loss		7			(35	)		—			(266	)		(294	)
	Balance, December 31, 2011	$	(17	)	$	(107	)	$	—		$	(685	)	$	(809	)
	Balance, December 31, 2011	$	(17	)	$	(107	)	$	—		$	(685	)	$	(809	)
	Other comprehensive income before reclassifications		50			148			1			—			199
	Amounts reclassified from accumulated other comprehensive loss		(9	)		118			—			(13	)		96
	Balance, December 31, 2012	$	24		$	159		$	1		$	(698	)	$	(514	)
	Balance, December 31, 2012	$	24		$	159		$	1		$	(698	)	$	(514	)
	Other comprehensive income before reclassifications		18			(379	)		(4	)		—			(365	)
	Amounts reclassified from accumulated other comprehensive loss		(26	)		(108	)		—			389			255
	Balance, December 31, 2013	$	16		$	(328	)	$	(3	)	$	(309	)	$	(624	)

Management_Stock_Plans_Tables

Management Stock Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Management Stock Plans	'
Summary of Stock Bonus Plan	'
	Grant Date	Units			Fair Value			Vesting		Pro-rata
		Granted			of Stock			Duration		Vesting Date
	April 15, 2011		4,754,105			4.69		3 years		April 15
	July 15, 2011		180,740			4.94		3 years		July 15
	April 15, 2012		4,816,795			4.78		3 years		April 15
	July 15, 2012		74,175			4.72		3 years		July 15
	April 15, 2013		3,656,340			6.66		3 years		April 15
	July 15, 2013		78,725			6.67		3 years		July 15
Rollforward of Restricted Stock Units Under Stock Bonus Plan	'
		Restricted Stock Units
		2013			2012
	Units outstanding, beginning of year		8,857,884			7,138,334
	Activity during the year:
	Granted		3,735,065			4,890,970
	Vested		(4,325,661	)		(2,920,392	)
	Forfeited		(416,271	)		(251,028	)
	Units outstanding, end of year		7,851,017			8,857,884
Summary of Compensation Costs, Corresponding Tax Benefit, and Unrecognized Compensation Costs	'
		Years Ended
		December 31,
	(Dollars in millions)	2013			2012			2011
	Compensation costs	$	21		$	18		$	15
	Tax benefit		8			7			6
	Unrecognized compensation costs		27			26			22

Employee_Pension_and_Other_Pos1

Employee Pension and Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2013
Employee Pension and Other Postretirement Benefits tables	'
Fair Value of Assets in Pension Plan and Other Benefits Plan	'
		Pension Plan						Other Benefits
								Plan
		Years Ended						Years Ended
		December 31,						December 31,
	(Dollars in millions)	2013			2012			2013			2012
	Change in plan assets:
	Fair value of plan assets, beginning of year	$	2,019		$	1,757		$	210		$	172
	Actual return on plan assets		391			254			37			23
	Acquisition		—			—			—			16
	Employer contributions		380			150			12			13
	Plan participants' contributions		—			—			7			6
	Benefits paid		(74	)		(142	)		(21	)		(20	)
	Fair value of plan assets, end of year	$	2,716		$	2,019		$	245		$	210
Table of Benefit Obligation Activity and Funded Status for Each of Plans	'
		Pension Benefits						Other Benefits
		Years Ended						Years Ended
		December 31,						December 31,
	(Dollars in millions)	2013			2012			2013			2012
	Accumulated benefit obligation	$	2,046		$	2,161
	Change in benefit obligation
	Benefit obligation, beginning of year	$	2,394		$	2,135		$	293		$	270
	Service cost		87			77			14			14
	Interest cost		99			101			11			12
	Plan participants' contributions		—			—			7			6
	Actuarial loss		(243	)		223			(34	)		9
	Medicare Part D employer subsidy		—			—			—			2
	Benefits paid		(74	)		(142	)		(21	)		(20	)
	Benefit obligation, end of year		2,263			2,394			270			293
	Fair value of plan assets, end of year		2,716			2,019			245			210
	Over (Under) funded status	$	453		$	(375	)	$	(25	)	$	(83	)
Table of Amounts Recognized in Accumulated Other Comprehensive Loss for Pension, Including ESBPs, and Other Benefits	'
	The following table illustrates the changes that were reflected in accumulated other comprehensive income during 2013, 2012 and 2011. Pension benefits do not include the ESBPs.
		Pension			Other Benefits
		Benefits
	(Dollars in millions)	Net Actuarial			Transition Assets			Net Actuarial
		(Gain) Loss						(Gain) Loss
	Amounts Recognized in Other Comprehensive Loss:
	Balance, December 31, 2010	$	595		$	3		$	78
	Arising during the year		465			—			18
	Recognized in net income during the year		(44	)		(2	)		(6	)
	Balance, December 31, 2011	$	1,016		$	1		$	90
	Arising during the year		115			—			(2	)
	Recognized in net income during the year		(89	)		(1	)		(8	)
	Balance, December 31, 2012	$	1,042		$	—		$	80
	Arising during the year		(468	)		—			(56	)
	Recognized in net income during the year		(107	)		—			(7	)
	Balance, December 31, 2013	$	467		$	—		$	17
	At December 31, 2013 and 2012, the following amounts were recognized in accumulated other comprehensive loss for pension, including ESBPs, and other benefits.
		December 31, 2013
		Pension Benefits									Other Benefits
	(Dollars in millions)	Gross			Tax			Net of Tax			Gross			Tax			Net of Tax
	Net actuarial loss	$	467		$	184		$	283		$	17		$	7		$	10
	Pension and other benefits adjustment		467			184			283			17			7			10
	Executive Supplemental Benefits Plans
	Net actuarial loss		26			10			16			—			—			—
	Executive supplemental benefits plans adjustment		26			10			16			—			—			—
	Pension and other benefits adjustment	$	493		$	194		$	299		$	17		$	7		$	10
		December 31, 2012
		Pension Benefits									Other Benefits
	(Dollars in millions)	Gross			Tax			Net of Tax			Gross			Tax			Net of Tax
	Net actuarial loss	$	1,042		$	410		$	632		$	80		$	32		$	48
	Pension and other benefits adjustment		1,042			410			632			80			32			48
	Executive Supplemental Benefits Plans
	Net actuarial loss		29			11			18			—			—			—
	Executive supplemental benefits plans adjustment		29			11			18			—			—			—
	Pension and other benefits adjustment	$	1,071		$	421		$	650		$	80		$	32		$	48
Estimated Future Benefit Payments and Subsidies	'
	The following pension and postretirement benefit payments, which reflect expected future service, as appropriate, are expected to be paid over the next 10 years and Medicare Part D Subsidies are expected to be received over the next 10 years. This table does not include the ESBPs.
	(Dollars in millions)	Pension			Postretirement			Medicare Part D
		Benefits			Benefits			Subsidies
	Years ending December 31,
	2014	$	82		$	15		$	1
	2015		89			16			1
	2016		97			16			1
	2017		105			18			1
	2018		113			18			1
	Years 2019 - 2023		682			103			6
Summary of Weighted Average Assumptions Used in Computing Present Value of Benefit Obligations and Net Periodic Benefit Cost	'
		Pension						Other Benefits
		Benefits
		Years Ended						Years Ended
		December 31,						December 31,
		2013			2012			2013			2012
	Discount rate in determining net periodic benefit cost		4.2	%		4.7	%		3.9	%		4.5	%
	Discount rate in determining benefit obligations at year end		4.9			4.2			4.6			3.9
	Rate of increase in future compensation levels for determining net periodic benefit cost		4.7			4.7			—			—
	Rate of increase in future compensation levels for determining benefit obligations at year end		4.7			4.7			—			—
	Expected return on plan assets		7.5			7.5			7.5			7.5
Components of Net Periodic Benefit Cost	'
		Pension Benefits									Other Benefits									Superannuation,
																				SERP(1) and ESBP
		Years Ended									Years Ended									Years Ended
		December 31,									December 31,									December 31,
	(Dollars in millions)	2013			2012			2011			2013			2012			2011			2013		2012		2011
	Components of net periodic benefit cost:
	Service cost	$	87		$	77		$	58		$	14		$	14		$	11		$	1	$	2	$	1
	Interest cost		99			101			98			11			12			13			3		2		4
	Expected return on plan assets		(166	)		(147	)		(147	)		(15	)		(13	)		(14	)		—		—		—
	Amortization of transition amount		—			—			—			—			1			2			—		—		—
	Recognized net actuarial loss		107			89			44			7			8			6			2		2		1
	Total net periodic benefit cost	$	127		$	120		$	53		$	17		$	22		$	18		$	6	$	6	$	6
	-1
	Supplemental Executives Retirement Plan (SERP).
Summary of Amounts Forecasted to be Recognized, Net Periodic Benefit Costs	'
		Years Ended December 31,
		2014						2013
	(Dollars in millions)	Pension			Other			Pension			Other
		Benefits			Benefits			Benefits			Benefits
	Net actuarial loss	$	55		$	—		$	109		$	6
	Amounts to be reclassified from accumulated other comprehensive loss	$	55		$	—		$	109		$	6
Schedule of Assumed Weighted-Average Healthcare Cost Trend Rates	'
		Years Ended December 31,
		2013			2012			2011
	Healthcare cost trend rate assumed for next year		7.71	%		8.31	%		8.9	%
	Rate to which cost trend rate is assumed to decline (the ultimate trend rate)		4.5	%		4.5	%		5	%
	Year the rate reaches the ultimate trend rate		2021			2021			2018
Schedule of Effect of One-Percentage-Point Change in Assumed Healthcare Cost Trend Rates	'
	(Dollars in millions)	One-Percentage-			One-Percentage-
		Point Increase			Point Decrease
	Effect on total of service and interest cost components	$	4		$	(4	)
	Effect on postretirement benefit obligation		33			(28	)
Retirement Plan	'
Employee Pension and Other Postretirement Benefits tables	'
Fair Value by Level Within Fair Value Hierarchy Assets by Major Asset Category for Pension Plan and Other Benefits Plan	'
		December 31, 2013
	(Dollars in millions)	Level 1			Level 2			Level 3			Total
	Pension Plan Investments:
	Cash and cash equivalents	$	—		$	28		$	—		$	28
	U.S. Government securities		—			230			—			230
	Corporate bonds		—			364			—			364
	Equity securities		233			—			—			233
	Real estate funds		—			—			242			242
	Limited partnerships		—			134			22			156
	Common collective funds		—			60			—			60
	Mutual funds		1,407			—			—			1,407
	Other		(1	)		28			—			27
	Total Plan Investments	$	1,639		$	844		$	264		$	2,747
	Accrued dividends and interest receivable											4
	Net pending trades											(35	)
	Total Plan Assets										$	2,716
		December 31, 2012
	(Dollars in millions)	Level 1			Level 2			Level 3			Total
	Pension Plan Investments:
	Cash and cash equivalents	$	—		$	42		$	—		$	42
	U.S. Government securities		—			214			—			214
	Corporate bonds		—			243			—			243
	Equity securities		158			—			—			158
	Real estate funds		—			—			156			156
	Limited partnerships		—			114			18			132
	Common collective funds		—			58			—			58
	Mutual funds		1,008			—			—			1,008
	Other		—			16			—			16
	Total Plan Investments	$	1,166		$	687		$	174		$	2,027
	Accrued dividends and interest receivable											3
	Net pending trades											(11	)
	Total Plan Assets										$	2,019
Changes in Fair Value of Assets Measured at Level 3	'
		Level 3 Assets for Year Ended December 31, 2013
	(Dollars in millions)	Real Estate Funds			Limited Partnership			Total
	Beginning balance—January 1, 2013	$	156		$	18		$	174
	Unrealized gains (losses)		18			—			18
	Purchases, issuances, sales, and settlements, net		68			4			72
	Ending balance—December 31, 2013	$	242		$	22		$	264
		Level 3 Assets for Year Ended December 31, 2012
	(Dollars in millions)	Real Estate Funds			Limited Partnership			Total
	Beginning balance—January 1, 2012	$	136		$	12		$	148
	Unrealized gains (losses)		7			1			8
	Purchases, issuances, sales, and settlements, net		13			5			18
	Ending balance—December 31, 2012	$	156		$	18		$	174
Other postretirement benefits	'
Employee Pension and Other Postretirement Benefits tables	'
Fair Value by Level Within Fair Value Hierarchy Assets by Major Asset Category for Pension Plan and Other Benefits Plan	'
		December 31, 2013
	(Dollars in millions)	Level 1			Level 2			Level 3			Total
	Other Postretirement Benefits Plan Investments:
	Cash and cash equivalents	$	—		$	2			—		$	2
	U.S. Government securities		—			33			—			33
	Corporate bonds		—			19			—			19
	Municipal bonds		—			1			—			1
	Mutual funds		133			—			—			133
	Pooled separate account		—			63			—			63
	Total Plan Investments	$	133		$	118		$	—		$	251
	Net pending trades											(6	)
	Total Plan Assets										$	245
		December 31, 2012
	(Dollars in millions)	Level 1			Level 2			Level 3			Total
	Other Postretirement Benefits Plan Investments:
	Cash and cash equivalents	$	—		$	9		$	—		$	9
	U.S. Government securities		—			24			—			24
	Corporate bonds		—			17			—			17
	Municipal bonds		—			1			—			1
	Mutual funds		109			—			—			109
	Pooled separate account		—			40			—			40
	Other		—			16			—			16
	Total Plan Investments	$	109		$	107		$	—		$	216
	Net pending trades											(6	)
	Total Plan Assets										$	210

Other_Noninterest_Income_and_O1

Other Noninterest Income and Other Noninterest Expense (Tables)	12 Months Ended
	Dec. 31, 2013
Other Noninterest Income and Other Noninterest Expense	'
Summary of Other Noninterest Income and Other Noninterest Expense	'
	The detail of other noninterest income is as follows.
		Years Ended
		December 31,
	(Dollars in millions)	2013			2012			2011
	Other investment income		33			44			35
	All other noninterest income		(24	)		(28	)		10
	Total other noninterest income	$	9		$	16		$	45
	The detail of other noninterest expense is as follows.
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Software	$	83		$	70		$	66
	LIHC investment amortization		76			63			69
	Advertising and public relations		61			57			45
	Communications		45			39			42
	Data processing		36			36			39
	Other		150			198			147
	Total other noninterest expense	$	451		$	463		$	408

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Taxes	'
Schedule of effective tax rate	'
		Years Ended
		December 31,
		2013			2012			2011
	Federal income tax rate		35	%		35	%		35	%
	Net tax effects of:
	State income taxes, net of federal income tax benefit		5			6			7
	Tax-exempt interest income		(1	)		(1	)		(1	)
	Tax credits		(13	)		(10	)		(10	)
	Change in estimate to the valuation of FDIC covered assets		—			—			(2	)
	Other		(3	)		(3	)		—
	Effective tax rate		23	%		27	%		29	%
Components of Income Tax Expense	'
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Taxes currently payable:
	Federal	$	79		$	93		$	105
	State		43			32			67
	Foreign		12			14			8
	Total currently payable		134			139			180
	Taxes deferred:
	Federal		71			62			101
	State		(8	)		20			28
	Foreign		(2	)		(1	)		(1	)
	Total deferred		61			81			128
	Total income tax expense	$	195		$	220		$	308
Schedule of components of the Company's net deferred tax balances	'
		December 31,
	(Dollars in millions)	2013			2012
	Deferred tax assets:
	Allowance for loan and unfunded credit commitment losses	$	287		$	338
	Accrued expense, net		216			131
	Unrealized losses on pension and post retirement benefits		204			456
	Unrealized net losses on securities available for sale		262			—
	Fair value adjustments for valuation of FDIC covered assets		183			218
	Other		97			108
	Total gross deferred tax assets		1,249			1,251
	Valuation allowance		—			(10	)
	Total deferred tax assets		1,249			1,241
	Deferred tax liabilities:
	Leasing		698			688
	Intangible assets		105			119
	Pension liabilities		363			251
	Other		17			123
	Total deferred tax liabilities		1,183			1,181
	Net deferred tax asset	$	66		$	60
Schedule of changes in unrecognized tax positions	'
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Balance, beginning of year	$	269		$	274		$	233
	Gross increases as a result of tax positions taken during prior periods		1			7			53
	Gross decreases as a result of tax positions taken during prior periods		(256	)		(13	)		(13	)
	Gross increases as a result of tax positions taken during current period		2			1			1
	Balance, end of year	$	16		$	269		$	274

Regulatory_Capital_Requirement1

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements	'
Summary of Capital Amounts and Ratios	'
		Actual					For Capital Adequacy Purposes
	(Dollars in millions)	Amount		Ratio			Amount		Ratio
	Capital Ratios for the Company:
	As of December 31, 2013:
	Tier 1 capital (to risk-weighted assets)	$	11,471		12.41	%	³	$3,696	³	4	%
	Total capital (to risk-weighted assets)		13,499		14.61		³	7,393	³	8
	Tier 1 leverage(1)		11,471		11.27		³	4,073	³	4
	As of December 31, 2012:
	Tier 1 capital (to risk-weighted assets)	$	9,864		11.91	%	³	$3,314	³	4	%
	Total capital (to risk-weighted assets)		11,048		13.34		³	6,628	³	8
	Tier 1 leverage(1)		9,864		11.18		³	3,531	³	4
	-1
	Tier 1 capital divided by quarterly average assets (excluding certain intangible assets).
		Actual					For Capital Adequacy Purposes					To Be Well-Capitalized
												Under Prompt Corrective
												Action Provisions
	(Dollars in millions)	Amount		Ratio			Amount		Ratio			Amount		Ratio
	Capital Ratios for the Bank:
	As of December 31, 2013:
	Tier 1 capital (to risk-weighted assets)	$	11,274		12.94	%	³	$3,485	³	4	%	³	$5,228	³	6	%
	Total capital (to risk-weighted assets)		12,990		14.91		³	6,970	³	8		³	8,713	³	10
	Tier 1 leverage(1)		11,274		11.13		³	4,051	³	4		³	5,063	³	5
	As of December 31, 2012:
	Tier 1 capital (to risk-weighted assets)	$	9,192		11.68	%	³	$3,147	³	4	%	³	$4,720	³	6	%
	Total capital (to risk-weighted assets)		10,362		13.17		³	6,294	³	8		³	7,867	³	10
	Tier 1 leverage(1)		9,162		10.51		³	3,498	³	4		³	4,373	³	5
	-1
	Tier 1 capital divided by quarterly average assets (excluding certain intangible assets).

Commitments_Contingencies_and_1

Commitments, Contingencies and Guarantees (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments, Contingencies and Guarantees	'
Summary of Commitments	'
	(Dollars in millions)	December 31, 2013
	Commitments to extend credit	$	33,107
	Issued standby and commercial letters of credit		5,881
	Other commitments		206

Business_Segments_Tables

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2013
Business Segments	'
Schedule of reportable business segments	'
	As of and for the Year Ended December 31, 2013:
	(Dollars in millions)	Retail			Commercial			Corporate		Transaction			Investment		Other			Reconciling			UnionBanCal
		Banking &			Banking			Banking		Banking			Banking &					Items			Corporation
		Wealth											Markets
		Markets
	Results of operations—Market View
	Net interest income (expense)	$	1,352		$	901		$	87	$	420		$	184	$	55		$	(283	)	$	2,716
	Noninterest income (expense)		371			196			64		161			210		64			(190	)		876
	Total revenue		1,723			1,097			151		581			394		119			(473	)		3,592
	Noninterest expense		1,423			413			48		362			100		574			(127	)		2,793
	(Reversal of) provision for loan losses		(36	)		46			1		(3	)		6		(55	)		(4	)		(45	)
	Income (loss) before income taxes and including noncontrolling interests		336			638			102		222			288		(400	)		(342	)		844
	Income tax expense (benefit)		132			155			40		88			78		(165	)		(133	)		195
	Net income (loss) including noncontrolling interest		204			483			62		134			210		(235	)		(209	)		649
	Deduct: net loss from noncontrolling interests		—			—			—		—			—		18			—			18
	Net income (loss) attributable to UnionBanCal	$	204		$	483		$	62	$	134		$	210	$	(217	)	$	(209	)	$	667
	Total assets, end of period	$	34,582		$	32,704		$	3,339	$	1,627		$	5,933	$	29,106		$	(1,397	)	$	105,894
	As of and for the Year Ended December 31, 2012:
	(Dollars in millions)	Retail			Commercial			Corporate		Transaction			Investment		Other			Reconciling			UnionBanCal
		Banking &			Banking			Banking		Banking			Banking &					Items			Corporation
		Wealth											Markets
		Markets
	Results of operations—Market View
	Net interest income (expense)	$	1,204		$	753		$	83	$	451		$	174	$	229		$	(292	)	$	2,602
	Noninterest income (expense)		336			211			64		167			207		31			(198	)		818
	Total revenue		1,540			964			147		618			381		260			(490	)		3,420
	Noninterest expense		1,294			393			50		356			77		527			(131	)		2,566
	(Reversal of) provision for loan losses		55			(47	)		24		(1	)		6		(9	)		(3	)		25
	Income (loss) before income taxes and including noncontrolling interests		191			618			73		263			298		(258	)		(356	)		829
	Income tax expense (benefit)		75			166			29		104			86		(102	)		(138	)		220
	Net income (loss) including noncontrolling interest		116			452			44		159			212		(156	)		(218	)		609
	Deduct: net loss from noncontrolling interests		—			—			—		—			—		19			—			19
	Net income (loss) attributable to UnionBanCal	$	116		$	452		$	44	$	159		$	212	$	(137	)	$	(218	)	$	628
	Total assets, end of period	$	31,804		$	25,450		$	3,025	$	1,631		$	7,137	$	29,065		$	(1,104	)	$	97,008
	As of and for the Year Ended December 31, 2011:
	(Dollars in millions)	Retail			Commercial			Corporate		Transaction			Investment		Other			Reconciling			UnionBanCal
		Banking &			Banking			Banking		Banking			Banking &					Items			Corporation
		Wealth											Markets
		Markets
	Results of operations—Market View
	Net interest income (expense)	$	1,202		$	708		$	77	$	468		$	131	$	175		$	(320	)	$	2,441
	Noninterest income (expense)		359			198			81		161			159		84			(215	)		827
	Total revenue		1,561			906			158		629			290		259			(535	)		3,268
	Noninterest expense		1,271			392			48		347			63		433			(139	)		2,415
	(Reversal of) provision for loan losses		(82	)		(106	)		8		(10	)		66		(79	)		1			(202	)
	Income (loss) before income taxes and including noncontrolling interests		372			620			102		292			161		(95	)		(397	)		1,055
	Income tax expense (benefit)		146			161			40		114			38		(37	)		(154	)		308
	Net income (loss) including noncontrolling interest		226			459			62		178			123		(58	)		(243	)		747
	Deduct: net loss from noncontrolling interests		—			—			—		—			—		15			—			15
	Net income (loss) attributable to UnionBanCal	$	226		$	459		$	62	$	178		$	123	$	(43	)	$	(243	)	$	762
	Total assets, end of period	$	26,956		$	22,435		$	2,613	$	1,668		$	6,326	$	30,472		$	(774	)	$	89,696

Condensed_UnionBanCal_Corporat1

Condensed UnionBanCal Corporation Unconsolidated Financial Statements (Parent Company) (Tables) (Parent Company)	12 Months Ended
	Dec. 31, 2013
Parent Company	'
Condensed Balance Sheets	'
		December 31,
	(Dollars in millions)	2013			2012
	Assets
	Cash and cash equivalents	$	191		$	763
	Investment in subsidiaries		14,784			12,544
	Other assets		5			24
	Total assets	$	14,980		$	13,331
	Liabilities and Stockholder's Equity
	Long-term debt	$	763		$	869
	Other liabilities		2			1
	Total liabilities		765			870
	Stockholder's equity		14,215			12,461
	Total liabilities and stockholder's equity	$	14,980		$	13,331
Condensed Statements of Income	'
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Income:
	Dividends from bank subsidiary	$	—		$	950		$	—
	Interest income on advances to subsidiaries and deposits in bank		—			1			1
	Total income		—			951			1
	Expense:
	Interest expense		31			23			13
	Other expense		4			—			18
	Total expense		35			23			31
	Income (loss) before income taxes and equity in undistributed net income of subsidiaries		(35	)		928			(30	)
	Income tax benefit		(14	)		(9	)		(10	)
	Income (loss) before equity in undistributed net income of subsidiaries		(21	)		937			(20	)
	Equity in undistributed net income (loss) of subsidiaries:
	Bank subsidiary		625			(403	)		783
	Nonbank subsidiaries		63			94			(1	)
	Net Income	$	667		$	628		$	762
Condensed Statements of Cash Flows	'
		Years Ended December 31,
	(Dollars in millions)	2013			2012			2011
	Cash Flows from Operating Activities:
	Net income	$	667		$	628		$	762
	Adjustments to reconcile net income (loss) to net cash provided by operating activities:
	Equity in undistributed net (income) loss of subsidiaries		(688	)		309			(782	)
	Other, net		14			(14	)		(3	)
	Net cash provided by (used in) operating activities		(7	)		923			(23	)
	Cash Flows from Investing Activities:
	Investments in and advances to subsidiaries		(1,700	)		—			(23	)
	Repayment of investments in and advances to subsidiaries		35			650			20
	Net cash acquired from (paid for) acquisitions		—			(1,457	)		—
	Net cash used in investing activities		(1,665	)		(807	)		(3	)
	Cash Flows from Financing Activities:
	Capital contribution from The Bank of Tokyo-Mitsubushi UFJ, Ltd. (BTMU)		1,200			—			—
	Proceeds from issuance of subordinated loan due to BTMU		300			—			—
	Proceeds from issuance of senior debt		—			397			—
	Repayment of subordinated debt		(400	)		—			—
	Repayment of junior subordinated debt		—			—			(14	)
	Other, net		—			(2	)		—
	Net cash provided by (used in) financing activities		1,100			395			(14	)
	Net increase (decrease) in cash and cash equivalents		(572	)		511			(40	)
	Cash and cash equivalents at beginning of year		763			252			292
	Cash and cash equivalents at end of year	$	191		$	763		$	252

Summary_of_Significant_Account2

Summary of Significant Accounting Policies and Nature of Operations (Details)	12 Months Ended
	Dec. 31, 2013
	item
Significant Accounting Policies	'
Loans placed on nonaccrual status when past due term (days)	'90 days
Interest accrual period (days)	'120 days
Consecutive payment period for accrual status	'6 months
Number of types of leases offered to customers	2
Minimum	'
Significant Accounting Policies	'
Intangible assets amortized period	'3 years
Maximum	'
Significant Accounting Policies	'
Intangible assets amortized period	'40 years
Premises | Minimum	'
Significant Accounting Policies	'
Estimated useful life	'10 years
Premises | Maximum	'
Significant Accounting Policies	'
Estimated useful life	'50 years
Furniture, fixtures and equipment | Minimum	'
Significant Accounting Policies	'
Estimated useful life	'3 years
Furniture, fixtures and equipment | Maximum	'
Significant Accounting Policies	'
Estimated useful life	'8 years

Correction_of_Prior_Period_Amo2

Correction of Prior Period Amounts (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net interest income	'	'	'	'
Interest expense - deposits	$248	$214	$204	'
Noninterest income	'	'	'	'
Trading account activities	61	101	97	'
Brokerage commissions and fees	46	39	39	'
Income before income taxes and including noncontrolling interests	844	829	1,055	'
Net Income attributable to UnionBanCal Corporation (UNBC)	667	628	762	'
Affected line items on the consolidated balance sheet and statement of changes in stockholder's equity:	'	'	'	'
Other assets	4,854	4,821	'	'
Interest bearing deposits	53,606	48,826	'	'
Other liabilities	1,675	2,099	'	'
Retained earnings	7,512	6,845	6,217	5,455
Line of Credit Facility Fees	111	105	94	'
As Previously Reported	'	'	'	'
Net interest income	'	'	'	'
Interest expense - deposits	'	233	216	'
Noninterest income	'	'	'	'
Trading account activities	'	115	126	'
Brokerage commissions and fees	'	44	47	'
Income before income taxes and including noncontrolling interests	'	830	1,081	'
Net Income attributable to UnionBanCal Corporation (UNBC)	'	629	778	'
Affected line items on the consolidated balance sheet and statement of changes in stockholder's equity:	'	'	'	'
Other assets	'	4,805	'	'
Interest bearing deposits	'	48,777	'	'
Other liabilities	'	2,102	'	'
Retained earnings	'	6,875	6,246	5,468
Error pertaining to income of certificate of deposits recognized within noninterest income | As Previously Reported	'	'	'	'
Affected line items on the consolidated balance sheet and statement of changes in stockholder's equity:	'	'	'	'
Line of Credit Facility Fees	'	51	48	'
Error pertaining to income of certificate of deposits recognized within noninterest income | Adjustment	'	'	'	'
Net interest income	'	'	'	'
Interest expense - deposits	'	-19	-12	'
Noninterest income	'	'	'	'
Trading account activities	'	-14	-29	'
Brokerage commissions and fees	'	-5	-8	'
Income before income taxes and including noncontrolling interests	'	-1	-26	'
Net Income attributable to UnionBanCal Corporation (UNBC)	'	-1	-16	'
Affected line items on the consolidated balance sheet and statement of changes in stockholder's equity:	'	'	'	'
Other assets	'	16	'	'
Interest bearing deposits	'	49	'	'
Other liabilities	'	-3	'	'
Retained earnings	'	($30)	($29)	($13)

Business_Combinations_Details

Business Combinations (Details) (USD $)

12 Months Ended

0 Months Ended

1 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 01, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Nov. 30, 2013

Oct. 31, 2012

Retail Banking and Wealth Markets

Commercial Banking

Corporate Banking

Investment Banking and Markets

Transaction Banking

PCBC

PCBC

PCBC

PCBC

PCBC

PCBC

PCBC

PCBC

PB Capital

PB Capital

First Bank Association Bank Services

First Bank Association Bank Services

Smartstreet

Retail Banking and Wealth Markets

Commercial Banking

Corporate Banking

Investment Banking and Markets

Transaction Banking

Business Acquisitions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchase price, paid in cash

'

'

'

'

'

'

'

'

'

$1,500,000,000

'

'

'

'

'

'

$3,700,000,000

'

'

'

'

Term for change in provisional fair value estimates of the loans acquired after closing date of acquisition

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loans acquired excluding the effects of purchase accounting adjustments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,500,000,000

'

'

'

'

Goodwill, adjustments

'

'

'

'

'

'

'

'

'

'

23,000,000

'

'

'

'

'

'

11,000,000

'

'

'

Purchase price

'

'

'

'

'

'

'

'

1,516,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Net assets acquired

'

'

'

'

'

'

'

'

859,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Purchase accounting adjustments:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities available for sale

'

'

'

'

'

'

'

'

8,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Loans held for investment

'

'

'

'

'

'

'

'

141,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Intangible assets

'

'

'

'

'

'

'

'

18,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Other assets

'

'

'

'

'

'

'

'

128,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Deposits

'

'

'

'

'

'

'

'

-12,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Other short-term borrowings

'

'

'

'

'

'

'

'

-36,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt

'

'

'

'

'

'

'

'

-14,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Other liabilities

'

'

'

'

'

'

'

'

11,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Total purchase accounting adjustments

'

'

'

'

'

'

'

'

244,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of net assets acquired

'

'

'

'

'

'

'

'

1,103,000,000

'

'

'

'

'

'

'

3,400,000,000

'

'

'

'

Goodwill

3,228,000,000

2,942,000,000

2,457,000,000

1,527,000,000

1,034,000,000

149,000,000

253,000,000

251,000,000

413,000,000

'

436,000,000

268,000,000

104,000,000

15,000,000

26,000,000

23,000,000

227,000,000

238,000,000

30,000,000

'

'

Deposits

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$570,000,000

$1,000,000,000

Securities_Details

Securities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Securities available for sale	'	'
Amortized Cost	$16,194	$21,076
Gross Unrealized Gains	76	414
Gross Unrealized Losses	453	138
Fair Value	15,817	21,352
U.S. government sponsored agencies	'	'
Securities available for sale	'	'
Amortized Cost	73	866
Gross Unrealized Gains	'	19
Fair Value	73	885
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	'	'
Securities available for sale	'	'
Amortized Cost	9,194	13,104
Gross Unrealized Gains	2	232
Gross Unrealized Losses	296	3
Fair Value	8,900	13,333
Residential mortgage-backed securities, Privately issued	'	'
Securities available for sale	'	'
Amortized Cost	220	445
Gross Unrealized Gains	4	8
Gross Unrealized Losses	2	10
Fair Value	222	443
Commercial mortgage-backed securities	'	'
Securities available for sale	'	'
Amortized Cost	1,947	2,863
Gross Unrealized Gains	8	114
Gross Unrealized Losses	85	6
Fair Value	1,870	2,971
Collateralized loan obligations	'	'
Securities available for sale	'	'
Amortized Cost	2,670	1,996
Gross Unrealized Gains	25	7
Gross Unrealized Losses	22	44
Fair Value	2,673	1,959
Asset-backed and other	'	'
Securities available for sale	'	'
Amortized Cost	34	145
Gross Unrealized Gains	1	1
Fair Value	35	146
Asset Liability Management securities	'	'
Securities available for sale	'	'
Amortized Cost	14,138	19,419
Gross Unrealized Gains	40	381
Gross Unrealized Losses	405	63
Fair Value	13,773	19,737
Other debt securities, Direct bank purchase bonds	'	'
Securities available for sale	'	'
Amortized Cost	1,968	1,482
Gross Unrealized Gains	35	27
Gross Unrealized Losses	43	71
Fair Value	1,960	1,438
Other debt securities, Other	'	'
Securities available for sale	'	'
Amortized Cost	81	156
Gross Unrealized Gains	'	6
Gross Unrealized Losses	5	4
Fair Value	76	158
Equity securities	'	'
Securities available for sale	'	'
Amortized Cost	7	19
Gross Unrealized Gains	1	'
Fair Value	$8	$19

Securities_Details_2

Securities (Details 2) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	$12,290	$3,112
Securities available for sale, 12 months or more, Fair Value	1,046	1,146
Securities available for sale, Fair Value, Total	13,336	4,258
Securities available for sale, Less than 12 months, Unrealized Losses	415	84
Securities available for sale, 12 months or more, Unrealized Losses	38	54
Securities available for sale, Unrealized Losses, Total	453	138
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	8,508	1,152
Securities available for sale, 12 months or more, Fair Value	147	13
Securities available for sale, Fair Value, Total	8,655	1,165
Securities available for sale, Less than 12 months, Unrealized Losses	293	3
Securities available for sale, 12 months or more, Unrealized Losses	3	'
Securities available for sale, Unrealized Losses, Total	296	3
Residential mortgage-backed securities, Privately issued	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	72	32
Securities available for sale, 12 months or more, Fair Value	18	137
Securities available for sale, Fair Value, Total	90	169
Securities available for sale, Less than 12 months, Unrealized Losses	2	'
Securities available for sale, 12 months or more, Unrealized Losses	'	10
Securities available for sale, Unrealized Losses, Total	2	10
Commercial mortgage-backed securities	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	1,274	675
Securities available for sale, 12 months or more, Fair Value	58	'
Securities available for sale, Fair Value, Total	1,332	675
Securities available for sale, Less than 12 months, Unrealized Losses	80	6
Securities available for sale, 12 months or more, Unrealized Losses	5	'
Securities available for sale, Unrealized Losses, Total	85	6
Collateralized loan obligations	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	1,879	168
Securities available for sale, 12 months or more, Fair Value	10	980
Securities available for sale, Fair Value, Total	1,889	1,148
Securities available for sale, Less than 12 months, Unrealized Losses	21	1
Securities available for sale, 12 months or more, Unrealized Losses	1	43
Securities available for sale, Unrealized Losses, Total	22	44
Asset-backed and other	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	'	32
Securities available for sale, 12 months or more, Fair Value	1	3
Securities available for sale, Fair Value, Total	1	35
Asset Liability Management securities	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	11,733	2,059
Securities available for sale, 12 months or more, Fair Value	234	1,133
Securities available for sale, Fair Value, Total	11,967	3,192
Securities available for sale, Less than 12 months, Unrealized Losses	396	10
Securities available for sale, 12 months or more, Unrealized Losses	9	53
Securities available for sale, Unrealized Losses, Total	405	63
Other debt securities, Direct bank purchase bonds	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	537	1,019
Securities available for sale, 12 months or more, Fair Value	778	'
Securities available for sale, Fair Value, Total	1,315	1,019
Securities available for sale, Less than 12 months, Unrealized Losses	18	71
Securities available for sale, 12 months or more, Unrealized Losses	25	'
Securities available for sale, Unrealized Losses, Total	43	71
Other debt securities, Other	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	15	34
Securities available for sale, 12 months or more, Fair Value	34	13
Securities available for sale, Fair Value, Total	49	47
Securities available for sale, Less than 12 months, Unrealized Losses	1	3
Securities available for sale, 12 months or more, Unrealized Losses	4	1
Securities available for sale, Unrealized Losses, Total	5	4
Equity securities	'	'
Securities available for sale	'	'
Securities available for sale, Less than 12 months, Fair Value	5	'
Securities available for sale, Fair Value, Total	$5	'

Securities_Details_3

Securities (Details 3) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Securities available for sale	'
One Year or Less	$224
Over One Year Through Five Years	725
Over Five Years Through Ten Years	2,216
Over Ten Years	12,644
Total Fair Value	15,809
U.S. government sponsored agencies	'
Securities available for sale	'
One Year or Less	73
Total Fair Value	73
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	'
Securities available for sale	'
One Year or Less	2
Over One Year Through Five Years	42
Over Five Years Through Ten Years	602
Over Ten Years	8,254
Total Fair Value	8,900
Residential mortgage-backed securities, Privately issued	'
Securities available for sale	'
Over Five Years Through Ten Years	6
Over Ten Years	216
Total Fair Value	222
Commercial mortgage-backed securities	'
Securities available for sale	'
Over Five Years Through Ten Years	34
Over Ten Years	1,836
Total Fair Value	1,870
Collateralized loan obligations	'
Securities available for sale	'
Over One Year Through Five Years	346
Over Five Years Through Ten Years	547
Over Ten Years	1,780
Total Fair Value	2,673
Asset-backed and other	'
Securities available for sale	'
Over One Year Through Five Years	27
Over Five Years Through Ten Years	8
Total Fair Value	35
Asset Liability Management securities	'
Securities available for sale	'
One Year or Less	75
Over One Year Through Five Years	415
Over Five Years Through Ten Years	1,197
Over Ten Years	12,086
Total Fair Value	13,773
Other debt securities, Direct bank purchase bonds	'
Securities available for sale	'
One Year or Less	149
Over One Year Through Five Years	288
Over Five Years Through Ten Years	1,005
Over Ten Years	518
Total Fair Value	1,960
Other debt securities, Other	'
Securities available for sale	'
Over One Year Through Five Years	22
Over Five Years Through Ten Years	14
Over Ten Years	40
Total Fair Value	$76

Securities_Details_4

Securities (Details 4) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Securities	'	'	'
Proceeds from sales	$8,340	$6,845	$4,556
Gross realized gains	190	113	59
Gross realized losses	$3	$2	'

Securities_Details_5

Securities (Details 5) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Sep. 30, 2012	Dec. 31, 2012
			Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	Commercial mortgage-backed securities	Collateralized loan obligations	Collateralized loan obligations
Securities held to maturity	'	'	'	'	'	'	'
Securities held to maturity, Amortized Cost	$6,671,000,000	$1,115,000,000	$5,065,000,000	$997,000,000	$1,606,000,000	'	$118,000,000
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI)	7,000,000	5,000,000	7,000,000	5,000,000	'	'	'
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI)	169,000,000	17,000,000	77,000,000	'	92,000,000	301,000,000	17,000,000
Total securities held to maturity, carrying amount	6,509,000,000	1,103,000,000	4,995,000,000	1,002,000,000	1,514,000,000	1,100,000,000	101,000,000
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI	11,000,000	32,000,000	8,000,000	12,000,000	3,000,000	'	20,000,000
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI	81,000,000	'	69,000,000	'	12,000,000	'	'
Total securities held to maturity, Fair Value	6,439,000,000	1,135,000,000	4,934,000,000	1,014,000,000	1,505,000,000	'	121,000,000
Carrying amount of securities transferred from held to maturity to available for sale	'	'	'	'	'	1,100,000,000	'
Transferred securities recorded at fair value, with an unrealized loss	'	'	'	'	'	$62,000,000	'

Securities_Details_6

Securities (Details 6) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
In Millions, unless otherwise specified			Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	Commercial mortgage-backed securities	Collateralized loan obligations	Collateralized loan obligations
Securities held to maturity	'	'	'	'	'	'
Less than 12 months, Fair Value	$4,889	'	$3,873	$1,016	'	'
Less than 12 months, Unrealized Losses, Recognized in OCI	122	'	76	46	'	'
Less than 12 months, Unrealized Losses, Not Recognized in OCI	78	'	68	10	'	'
12 months or more, Fair Value	543	'	54	489	121	'
12 months or more, Unrealized Losses, Recognized in OCI	47	'	1	46	17	'
12 months or more, Unrealized Losses, Not Recognized in OCI	3	'	1	2	'	'
Total, Fair Value	5,432	'	3,927	1,505	121	'
Total, Unrealized Losses, Recognized in OCI	169	17	77	92	17	301
Total, Unrealized Losses, Not Recognized in OCI	$81	'	$69	$12	'	'

Securities_Details_7

Securities (Details 7) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
In Millions, unless otherwise specified			Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	Commercial mortgage-backed securities	CLOs	CLOs
Securities held to maturity	'	'	'	'	'	'	'
Over One Year Through Five Years, Carrying Amount	$4	'	$4	'	'	'	'
Over Five Years Through Ten Years, Carrying Amount	835	'	'	'	835	'	'
Over Ten Years, Carrying Amount	5,670	'	4,991	'	679	'	'
Total securities held to maturity, carrying amount	6,509	1,103	4,995	1,002	1,514	101	1,100
Over One Year Through Five Years, Fair Value	4	'	4	'	'	'	'
Over Five Years Through Ten Years, Fair Value	834	'	'	'	834	'	'
Over Ten Years, Fair Value	5,601	'	4,930	'	671	'	'
Total securities held to maturity, Fair Value	$6,439	$1,135	$4,934	$1,014	$1,505	$121	'

Securities_Details_8

Securities (Details 8) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Securities Pledged as Collateral	'	'
Securities available for sale pledged as collateral	$6,100,000,000	'
Borrowings	'	'
Securities Pledged as Collateral	'	'
Securities available for sale pledged as collateral	700,000,000	'
Derivative	'	'
Securities Pledged as Collateral	'	'
Securities available for sale pledged as collateral	200,000,000	'
Public and trust deposits	'	'
Securities Pledged as Collateral	'	'
Securities available for sale pledged as collateral	5,200,000,000	'
Permitted by contract to sell or repledge	10,000,000	19,000,000
Repledged to secure public agency or bankruptcy deposits and to cover short sales	$0	$0

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Millions, unless otherwise specified
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	$67,206	$58,849	'	'
Purchased credit-impaired loans	1,106	1,185	'	'
Total loans held for investment	68,312	60,034	'	'
Allowance for loan losses	-568	-653	-764	-1,191
Loans Held for Investment, net	67,744	59,381	'	'
Loans covered under a loss share agreement with FDIC	251	421	'	'
Covered loans not accounted for under accounting guidance for loans acquired with deteriorated credit quality	15	24	'	'
Unamortized discounts and premiums and deferred fees and costs	88	5	'	'
Commercial portfolio	'	'	'	'
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	38,379	32,497	'	'
Total loans held for investment	38,379	32,497	'	'
Allowance for loan losses	-421	-418	-474	-683
Commercial portfolio | Commercial and industrial	'	'	'	'
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	23,528	20,827	'	'
Commercial portfolio | Commercial mortgage	'	'	'	'
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	13,092	9,939	'	'
Commercial portfolio | Construction	'	'	'	'
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	905	627	'	'
Commercial portfolio | Lease financing	'	'	'	'
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	854	1,104	'	'
Consumer portfolio	'	'	'	'
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	28,827	26,352	'	'
Total loans held for investment	28,827	26,352	'	'
Allowance for loan losses	-69	-124	-138	-185
Consumer portfolio | Residential mortgage	'	'	'	'
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	25,547	22,705	'	'
Consumer portfolio | Home equity and other consumer loans	'	'	'	'
Loans disclosures	'	'	'	'
Loans excluding purchased credit-impaired loans	$3,280	$3,647	'	'

Loans_and_Allowance_for_Loan_L3

Loans and Allowance for Loan Losses (Details 2) (USD $)	12 Months Ended				12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
				BTMU	Commercial portfolio	Commercial portfolio	Commercial portfolio	Consumer portfolio	Consumer portfolio	Consumer portfolio	Purchased credit-impaired loans	Purchased credit-impaired loans	Purchased credit-impaired loans	Unallocated portfolio	Unallocated portfolio	Unallocated portfolio
Financing Receivable, Allowance for Credit Losses	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Allowance for loan losses, beginning of period	$653	$764	$1,191	$16	$418	$474	$683	$124	$138	$185	$1	$17	$25	$110	$135	$298
(Reversal of) provision for loan losses	-44	28	-200	'	18	-25	-74	-29	78	37	'	'	'	-33	-25	-163
(Reversal of) provision for FDIC covered loan losses not subject to FDIC indemnification	-1	-3	-2	'	'	'	'	'	'	'	-1	-3	-2	'	'	'
Decrease (increase) in allowance covered by FDIC indemnification	-8	-5	-5	'	'	'	'	'	'	'	-8	-5	-5	'	'	'
Other	'	'	16	'	'	'	16	'	'	'	'	'	'	'	'	'
Loans charged off	-77	-196	-307	'	-44	-88	-217	-30	-95	-87	-3	-13	-3	'	'	'
Recoveries of loans previously charged off	45	65	71	'	29	57	66	4	3	3	12	5	2	'	'	'
Allowance for loan losses, end of period	$568	$653	$764	$16	$421	$418	$474	$69	$124	$138	$1	$1	$17	$77	$110	$135

Loans_and_Allowance_for_Loan_L4

Loans and Allowance for Loan Losses (Details 3) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Millions, unless otherwise specified
Loan losses allowance	'	'	'	'
Individually evaluated for impairment	$39	$42	'	'
Collectively evaluated for impairment	528	610	'	'
Purchased credit-impaired loans	1	1	'	'
Total allowance for loan losses	568	653	764	1,191
Loans held for investment:	'	'	'	'
Individually evaluated for impairment	608	627	'	'
Collectively evaluated for impairment	66,601	58,227	'	'
Purchased credit-impaired loans	1,103	1,180	'	'
Total loans held for investment	68,312	60,034	'	'
Commercial portfolio	'	'	'	'
Loan losses allowance	'	'	'	'
Individually evaluated for impairment	19	24	'	'
Collectively evaluated for impairment	402	394	'	'
Total allowance for loan losses	421	418	474	683
Loans held for investment:	'	'	'	'
Individually evaluated for impairment	266	330	'	'
Collectively evaluated for impairment	38,113	32,167	'	'
Total loans held for investment	38,379	32,497	'	'
Consumer portfolio	'	'	'	'
Loan losses allowance	'	'	'	'
Individually evaluated for impairment	20	18	'	'
Collectively evaluated for impairment	49	106	'	'
Total allowance for loan losses	69	124	138	185
Loans held for investment:	'	'	'	'
Individually evaluated for impairment	339	292	'	'
Collectively evaluated for impairment	28,488	26,060	'	'
Total loans held for investment	28,827	26,352	'	'
Purchased credit-impaired loans	'	'	'	'
Loan losses allowance	'	'	'	'
Purchased credit-impaired loans	1	1	'	'
Total allowance for loan losses	1	1	17	25
Loans held for investment:	'	'	'	'
Individually evaluated for impairment	3	5	'	'
Purchased credit-impaired loans	1,103	1,180	'	'
Total loans held for investment	1,106	1,185	'	'
Unallocated portfolio	'	'	'	'
Loan losses allowance	'	'	'	'
Collectively evaluated for impairment	77	110	'	'
Total allowance for loan losses	$77	$110	$135	$298

Loans_and_Allowance_for_Loan_L5

Loans and Allowance for Loan Losses (Details 4) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Nonaccrual loans	'	'
Nonaccrual loans, before purchased credit-impaired loans	$427	$475
Nonaccrual loans	442	505
Troubled debt restructured loans that continue to accrue interest	367	401
Troubled debt restructured nonaccrual loans (included in the total nonaccrual loans above)	225	209
Commercial portfolio	'	'
Nonaccrual loans	'	'
Nonaccrual loans	95	113
Commercial portfolio | Commercial and industrial	'	'
Nonaccrual loans	'	'
Nonaccrual loans	44	48
Commercial portfolio | Commercial mortgage	'	'
Nonaccrual loans	'	'
Nonaccrual loans	51	65
Consumer portfolio	'	'
Nonaccrual loans	'	'
Nonaccrual loans	332	362
Consumer portfolio | Residential mortgage	'	'
Nonaccrual loans	'	'
Nonaccrual loans	286	306
Consumer portfolio | Home equity and other consumer loans	'	'
Nonaccrual loans	'	'
Nonaccrual loans	46	56
Purchased credit-impaired loans	'	'
Nonaccrual loans	'	'
Nonaccrual loans	$15	$30

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses (Details 5) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Aging of loans	'	'
Current	$66,785	$58,287
30 to 89 Days Past Due	285	355
90 Days or More Past Due	136	207
Total Past Due	421	562
Total loans held for investment, before purchased credit-impaired loans	67,206	58,849
Total loans 90 days or more past due and still accruing	5	1
Commercial portfolio	'	'
Aging of loans	'	'
Current	38,205	32,352
30 to 89 Days Past Due	148	130
90 Days or More Past Due	26	15
Total Past Due	174	145
Total loans held for investment, before purchased credit-impaired loans	38,379	32,497
Commercial portfolio | Commercial and industrial	'	'
Aging of loans	'	'
Current	24,310	21,861
30 to 89 Days Past Due	66	68
90 Days or More Past Due	6	2
Total Past Due	72	70
Total loans held for investment, before purchased credit-impaired loans	24,382	21,931
Commercial portfolio | Commercial mortgage	'	'
Aging of loans	'	'
Current	13,004	9,869
30 to 89 Days Past Due	68	57
90 Days or More Past Due	20	13
Total Past Due	88	70
Total loans held for investment, before purchased credit-impaired loans	13,092	9,939
Commercial portfolio | Construction	'	'
Aging of loans	'	'
Current	891	622
30 to 89 Days Past Due	14	5
Total Past Due	14	5
Total loans held for investment, before purchased credit-impaired loans	905	627
Consumer portfolio	'	'
Aging of loans	'	'
Current	28,580	25,935
30 to 89 Days Past Due	137	225
90 Days or More Past Due	110	192
Total Past Due	247	417
Total loans held for investment, before purchased credit-impaired loans	28,827	26,352
Consumer portfolio | Residential mortgage	'	'
Aging of loans	'	'
Current	25,342	22,351
30 to 89 Days Past Due	114	181
90 Days or More Past Due	91	173
Total Past Due	205	354
Total loans held for investment, before purchased credit-impaired loans	25,547	22,705
Consumer portfolio | Home equity and other consumer loans	'	'
Aging of loans	'	'
Current	3,238	3,584
30 to 89 Days Past Due	23	44
90 Days or More Past Due	19	19
Total Past Due	42	63
Total loans held for investment, before purchased credit-impaired loans	3,280	3,647
Purchased credit-impaired loans	'	'
Aging of loans	'	'
Total loans 90 days or more past due and still accruing	$124	$124

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses (Details 6) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Aging of loans	'	'
Loans covered under a loss share agreement with FDIC	$251	$421
Commercial Loan	'	'
Aging of loans	'	'
Loans covered under a loss share agreement with FDIC	213	365
Total loans	38,674	32,621
Commercial portfolio	'	'
Aging of loans	'	'
Total loans	38,060	32,146
Commercial portfolio | Commercial and industrial	'	'
Aging of loans	'	'
Total loans	24,235	21,779
Commercial portfolio | Construction	'	'
Aging of loans	'	'
Total loans	893	627
Commercial portfolio | Commercial mortgage	'	'
Aging of loans	'	'
Total loans	12,932	9,740
Purchased credit-impaired loans | Commercial Loan	'	'
Aging of loans	'	'
Total loans	614	475
Pass | Commercial Loan	'	'
Aging of loans	'	'
Total loans	36,835	30,890
Pass | Commercial portfolio	'	'
Aging of loans	'	'
Total loans	36,787	30,869
Pass | Commercial portfolio | Commercial and industrial	'	'
Aging of loans	'	'
Total loans	23,346	20,961
Pass | Commercial portfolio | Construction	'	'
Aging of loans	'	'
Total loans	879	610
Pass | Commercial portfolio | Commercial mortgage	'	'
Aging of loans	'	'
Total loans	12,562	9,298
Pass | Purchased credit-impaired loans | Commercial Loan	'	'
Aging of loans	'	'
Total loans	48	21
Special Mention | Commercial Loan	'	'
Aging of loans	'	'
Total loans	936	802
Special Mention | Commercial portfolio	'	'
Aging of loans	'	'
Total loans	732	649
Special Mention | Commercial portfolio | Commercial and industrial	'	'
Aging of loans	'	'
Total loans	576	438
Special Mention | Commercial portfolio | Construction	'	'
Aging of loans	'	'
Total loans	14	17
Special Mention | Commercial portfolio | Commercial mortgage	'	'
Aging of loans	'	'
Total loans	142	194
Special Mention | Purchased credit-impaired loans | Commercial Loan	'	'
Aging of loans	'	'
Total loans	204	153
Classified | Commercial Loan	'	'
Aging of loans	'	'
Total loans	903	929
Classified | Commercial portfolio	'	'
Aging of loans	'	'
Total loans	541	628
Classified | Commercial portfolio | Commercial and industrial	'	'
Aging of loans	'	'
Total loans	313	380
Classified | Commercial portfolio | Commercial mortgage	'	'
Aging of loans	'	'
Total loans	228	248
Classified | Purchased credit-impaired loans | Commercial Loan	'	'
Aging of loans	'	'
Total loans	$362	$301

Loans_and_Allowance_for_Loan_L8

Loans and Allowance for Loan Losses (Details 7) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Consumer portfolio loans	'	'
Nonaccrual	$442	$505
Total loans held for investment, before purchased credit-impaired loans	67,206	58,849
Consumer	'	'
Consumer portfolio loans	'	'
Accrual	28,737	26,278
Nonaccrual	332	362
Total loans held for investment, before purchased credit-impaired loans	29,069	26,640
Loans not covered	38	57
Consumer portfolio	'	'
Consumer portfolio loans	'	'
Accrual	28,495	25,990
Nonaccrual	332	362
Total loans held for investment, before purchased credit-impaired loans	28,827	26,352
Consumer portfolio | Residential mortgage	'	'
Consumer portfolio loans	'	'
Accrual	25,261	22,399
Nonaccrual	286	306
Total loans held for investment, before purchased credit-impaired loans	25,547	22,705
Consumer portfolio | Home equity and other consumer loans	'	'
Consumer portfolio loans	'	'
Accrual	3,234	3,591
Nonaccrual	46	56
Total loans held for investment, before purchased credit-impaired loans	3,280	3,647
Purchased credit-impaired loans	'	'
Consumer portfolio loans	'	'
Nonaccrual	15	30
Purchased credit-impaired loans | Consumer	'	'
Consumer portfolio loans	'	'
Accrual	242	288
Total loans held for investment, before purchased credit-impaired loans	$242	$288

Loans_and_Allowance_for_Loan_L9

Loans and Allowance for Loan Losses (Details 8) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consumer	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	$28,821	$26,024
Percentage of total	100.00%	100.00%
Consumer | FICO Score 720 and Above	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	21,991	19,673
Percentage of total	76.00%	76.00%
Consumer | FICO Score Below 720	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	6,275	5,824
Percentage of total	22.00%	22.00%
Consumer | No FICO Available	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	555	527
Percentage of total	2.00%	2.00%
Consumer portfolio	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	28,577	25,736
Consumer portfolio | FICO Score 720 and Above	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	21,897	19,567
Consumer portfolio | FICO Score Below 720	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	6,140	5,652
Consumer portfolio | No FICO Available	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	540	517
Consumer portfolio | Residential mortgage	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	25,374	22,164
Consumer portfolio | Residential mortgage | FICO Score 720 and Above	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	19,614	17,103
Consumer portfolio | Residential mortgage | FICO Score Below 720	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	5,301	4,666
Consumer portfolio | Residential mortgage | No FICO Available	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	459	395
Consumer portfolio | Home equity and other consumer loans	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	3,203	3,572
Consumer portfolio | Home equity and other consumer loans | FICO Score 720 and Above	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	2,283	2,464
Consumer portfolio | Home equity and other consumer loans | FICO Score Below 720	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	839	986
Consumer portfolio | Home equity and other consumer loans | No FICO Available	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	81	122
Purchased credit-impaired loans | Consumer	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	244	288
Purchased credit-impaired loans | Consumer | FICO Score 720 and Above	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	94	106
Purchased credit-impaired loans | Consumer | FICO Score Below 720	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	135	172
Purchased credit-impaired loans | Consumer | No FICO Available	'	'
Credit quality of consumer loans	'	'
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements	$15	$10

Recovered_Sheet1

Loans and Allowance for Loan Losses (Details 9) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consumer	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	$28,717	$25,939
Percentage of total loans categorized by LTV ratio	100.00%	100.00%
Consumer | LTV ratio less than 80%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	25,848	20,059
Percentage of total loans categorized by LTV ratio	90.00%	77.00%
Consumer | LTV ratio 80-100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	2,303	3,699
Percentage of total loans categorized by LTV ratio	8.00%	14.00%
Consumer | LTV ratio Greater than 100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	461	1,925
Percentage of total loans categorized by LTV ratio	2.00%	8.00%
Consumer | No LTV Available	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	105	256
Percentage of total loans categorized by LTV ratio	'	1.00%
Consumer portfolio	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	28,477	25,651
Consumer portfolio | LTV ratio less than 80%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	25,696	19,987
Consumer portfolio | LTV ratio 80-100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	2,246	3,649
Consumer portfolio | LTV ratio Greater than 100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	430	1,772
Consumer portfolio | No LTV Available	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	105	243
Consumer portfolio | Residential mortgage	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	25,374	22,164
Consumer portfolio | Residential mortgage | LTV ratio less than 80%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	23,209	17,771
Consumer portfolio | Residential mortgage | LTV ratio 80-100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	1,884	3,031
Consumer portfolio | Residential mortgage | LTV ratio Greater than 100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	228	1,232
Consumer portfolio | Residential mortgage | No LTV Available	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	53	130
Consumer portfolio | Home Equity loans	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	3,103	3,487
Consumer portfolio | Home Equity loans | LTV ratio less than 80%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	2,487	2,216
Consumer portfolio | Home Equity loans | LTV ratio 80-100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	362	618
Consumer portfolio | Home Equity loans | LTV ratio Greater than 100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	202	540
Consumer portfolio | Home Equity loans | No LTV Available	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	52	113
Purchased credit-impaired loans | Consumer	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	240	288
Purchased credit-impaired loans | Consumer | LTV ratio less than 80%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	152	72
Purchased credit-impaired loans | Consumer | LTV ratio 80-100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	57	50
Purchased credit-impaired loans | Consumer | LTV ratio Greater than 100%	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	31	153
Purchased credit-impaired loans | Consumer | No LTV Available	'	'
Credit quality of consumer loans	'	'
Loans categorized by LTV ratio	'	$13

Recovered_Sheet2

Loans and Allowance for Loan Losses (Details 10) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pre- and Post - modification recorded investments	'	'
Commitment to lend additional funds to borrowers with loan modifications classified as TDRs	$43	$33
Total excluding purchased credit-impaired loans	589	606
TDRs covered by FDIC loss share agreements	3	4
TDR modifications charge-offs	0	20
Commercial portfolio	'	'
Pre- and Post - modification recorded investments	'	'
Total excluding purchased credit-impaired loans	250	314
Commercial portfolio | Commercial and industrial	'	'
Pre- and Post - modification recorded investments	'	'
Total excluding purchased credit-impaired loans	212	215
Commercial portfolio | Commercial mortgage	'	'
Pre- and Post - modification recorded investments	'	'
Total excluding purchased credit-impaired loans	38	64
Commercial portfolio | Construction	'	'
Pre- and Post - modification recorded investments	'	'
Total excluding purchased credit-impaired loans	'	35
Consumer portfolio	'	'
Pre- and Post - modification recorded investments	'	'
Total excluding purchased credit-impaired loans	339	292
Consumer portfolio | Residential mortgage	'	'
Pre- and Post - modification recorded investments	'	'
Total excluding purchased credit-impaired loans	315	271
Consumer portfolio | Home equity and other consumer loans	'	'
Pre- and Post - modification recorded investments	'	'
Total excluding purchased credit-impaired loans	$24	$21

Recovered_Sheet3

Loans and Allowance for Loan Losses (Details 11) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pre- and Post - modification recorded investments	'	'
Pre-Modification Outstanding Recorded Investment	$344	$373
Post-Modification Outstanding Recorded Investment	338	345
TDRS covered by FDIC loss share agreements with pre-modification balance	0	5
TDRS covered by FDIC loss share agreements with post-modification balance	0	4
Commercial portfolio	'	'
Pre- and Post - modification recorded investments	'	'
Pre-Modification Outstanding Recorded Investment	231	183
Post-Modification Outstanding Recorded Investment	227	175
Commercial portfolio | Commercial and industrial	'	'
Pre- and Post - modification recorded investments	'	'
Pre-Modification Outstanding Recorded Investment	161	154
Post-Modification Outstanding Recorded Investment	158	147
Commercial portfolio | Commercial mortgage	'	'
Pre- and Post - modification recorded investments	'	'
Pre-Modification Outstanding Recorded Investment	70	22
Post-Modification Outstanding Recorded Investment	69	21
Commercial portfolio | Construction	'	'
Pre- and Post - modification recorded investments	'	'
Pre-Modification Outstanding Recorded Investment	'	7
Post-Modification Outstanding Recorded Investment	'	7
Consumer portfolio	'	'
Pre- and Post - modification recorded investments	'	'
Pre-Modification Outstanding Recorded Investment	113	190
Post-Modification Outstanding Recorded Investment	111	170
Consumer portfolio | Residential mortgage	'	'
Pre- and Post - modification recorded investments	'	'
Pre-Modification Outstanding Recorded Investment	104	159
Post-Modification Outstanding Recorded Investment	103	151
Consumer portfolio | Home equity and other consumer loans	'	'
Pre- and Post - modification recorded investments	'	'
Pre-Modification Outstanding Recorded Investment	9	31
Post-Modification Outstanding Recorded Investment	$8	$19

Recovered_Sheet4

Loans and Allowance for Loan Losses (Details 12) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pre- and Post - modification recorded investments	'	'
Total troubled debt restructured loans at date of default	$30	$53
Minimum defaulting period	'60 days	'
Commercial portfolio	'	'
Pre- and Post - modification recorded investments	'	'
Total troubled debt restructured loans at date of default	12	19
Commercial portfolio | Commercial and industrial	'	'
Pre- and Post - modification recorded investments	'	'
Total troubled debt restructured loans at date of default	10	3
Commercial portfolio | Commercial mortgage	'	'
Pre- and Post - modification recorded investments	'	'
Total troubled debt restructured loans at date of default	2	1
Commercial portfolio | Construction	'	'
Pre- and Post - modification recorded investments	'	'
Total troubled debt restructured loans at date of default	'	15
Consumer portfolio	'	'
Pre- and Post - modification recorded investments	'	'
Total troubled debt restructured loans at date of default	18	34
Consumer portfolio | Residential mortgage	'	'
Pre- and Post - modification recorded investments	'	'
Total troubled debt restructured loans at date of default	16	34
Consumer portfolio | Home equity and other consumer loans	'	'
Pre- and Post - modification recorded investments	'	'
Total troubled debt restructured loans at date of default	$2	'

Recovered_Sheet5

Loans and Allowance for Loan Losses (Details 13) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Loan impairment	'	'
Recorded investment with an allowance	$376	$360
Recorded investment without an allowance	232	266
Impaired loans	608	626
Allowance for impaired loans	39	42
Unpaid principal balance with an allowance	399	388
Unpaid principal balance without an allowance	277	314
Total, excluding purchased credit impaired loans	'	'
Loan impairment	'	'
Recorded investment with an allowance	374	360
Recorded investment without an allowance	231	262
Impaired loans	605	622
Allowance for impaired loans	39	42
Unpaid principal balance with an allowance	397	387
Unpaid principal balance without an allowance	271	300
Commercial portfolio	'	'
Loan impairment	'	'
Recorded investment with an allowance	150	171
Recorded investment without an allowance	116	159
Impaired loans	266	330
Allowance for impaired loans	19	24
Unpaid principal balance with an allowance	157	185
Unpaid principal balance without an allowance	129	172
Commercial portfolio | Commercial and industrial	'	'
Loan impairment	'	'
Recorded investment with an allowance	117	156
Recorded investment without an allowance	104	64
Impaired loans	221	220
Allowance for impaired loans	16	24
Unpaid principal balance with an allowance	121	167
Unpaid principal balance without an allowance	114	64
Commercial portfolio | Commercial mortgage	'	'
Loan impairment	'	'
Recorded investment with an allowance	33	15
Recorded investment without an allowance	12	60
Impaired loans	45	75
Allowance for impaired loans	3	'
Unpaid principal balance with an allowance	36	18
Unpaid principal balance without an allowance	15	70
Commercial portfolio | Construction	'	'
Loan impairment	'	'
Recorded investment without an allowance	'	35
Impaired loans	'	35
Unpaid principal balance without an allowance	'	38
Consumer portfolio	'	'
Loan impairment	'	'
Recorded investment with an allowance	224	189
Recorded investment without an allowance	115	103
Impaired loans	339	292
Allowance for impaired loans	20	18
Unpaid principal balance with an allowance	240	202
Unpaid principal balance without an allowance	142	128
Consumer portfolio | Residential mortgage	'	'
Loan impairment	'	'
Recorded investment with an allowance	220	186
Recorded investment without an allowance	95	85
Impaired loans	315	271
Allowance for impaired loans	20	18
Unpaid principal balance with an allowance	236	199
Unpaid principal balance without an allowance	108	97
Consumer portfolio | Home equity and other consumer loans	'	'
Loan impairment	'	'
Recorded investment with an allowance	4	3
Recorded investment without an allowance	20	18
Impaired loans	24	21
Unpaid principal balance with an allowance	4	3
Unpaid principal balance without an allowance	34	31
Purchased credit-impaired loans	'	'
Loan impairment	'	'
Recorded investment with an allowance	2	'
Recorded investment without an allowance	1	4
Impaired loans	3	4
Unpaid principal balance with an allowance	2	1
Unpaid principal balance without an allowance	$6	$14

Recovered_Sheet6

Loans and Allowance for Loan Losses (Details 14) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loan impairment	'	'	'
Average Recorded Investment	$623	$588	$567
Recognized Interest Income	37	25	17
Loan losses allowance	'	'	'
Transfer of loans from held for investment to held for sale	592	308	'
Loans receivable sold during the period	627	318	'
Total, excluding purchased credit impaired loans	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	619	580	551
Recognized Interest Income	37	24	16
Commercial portfolio	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	304	352	432
Recognized Interest Income	26	15	10
Commercial portfolio | Commercial and industrial	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	243	201	185
Recognized Interest Income	14	12	6
Commercial portfolio | Commercial mortgage	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	53	107	191
Recognized Interest Income	9	1	1
Commercial portfolio | Construction	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	8	44	56
Recognized Interest Income	3	2	3
Consumer portfolio	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	315	228	119
Recognized Interest Income	11	9	6
Consumer portfolio | Residential mortgage	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	293	221	117
Recognized Interest Income	10	8	6
Consumer portfolio | Home equity and other consumer loans	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	22	7	2
Recognized Interest Income	1	1	'
Purchased credit-impaired loans	'	'	'
Loan impairment	'	'	'
Average Recorded Investment	4	8	16
Recognized Interest Income	'	$1	$1

Recovered_Sheet7

Loans and Allowance for Loan Losses (Details 15) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Loans and Allowance for Loan Losses	'	'
Total outstanding balance	$1,733	$2,155
Carrying amount	$1,091	$1,161

Recovered_Sheet8

Loans and Allowance for Loan Losses (Details 16) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loans and Allowance for Loan Losses	'	'	'
Accretable yield, beginning of period	$590,000,000	$424,000,000	$231,000,000
Additions	31,000,000	171,000,000	'
Accretion	-336,000,000	-297,000,000	-192,000,000
Reclassifications from nonaccretable difference during the period	93,000,000	292,000,000	385,000,000
Accretable yield, end of period	378,000,000	590,000,000	424,000,000
Concentrations of Credit Risk	'	'	'
Loans	68,312,000,000	60,034,000,000	'
Loans Receivable | Credit Risk | Residential mortgage loans	'	'	'
Concentrations of Credit Risk	'	'	'
Loans	26,000,000,000	'	'
Loans Receivable | Credit Risk | Real estate	'	'	'
Concentrations of Credit Risk	'	'	'
Loans	14,000,000,000	'	'
Additional unfunded commitments to extend credit	5,000,000,000	'	'
Loans Receivable | Credit Risk | Power and utilities	'	'	'
Concentrations of Credit Risk	'	'	'
Loans	5,000,000,000	'	'
Additional unfunded commitments to extend credit	8,000,000,000	'	'
Loans Receivable | Credit Risk | Manufacturing sector	'	'	'
Concentrations of Credit Risk	'	'	'
Loans	4,000,000,000	'	'
Additional unfunded commitments to extend credit	$4,000,000,000	'	'

Premises_and_Equipment_and_Oth2

Premises and Equipment and Other Assets (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Premises and Equipment	'	'
Cost	$1,743	$1,895
Accumulated Depreciation and Amortization	-1,055	-1,185
Net Book Value	688	710
Land	'	'
Premises and Equipment	'	'
Cost	154	155
Net Book Value	154	155
Premises	'	'
Premises and Equipment	'	'
Cost	621	689
Accumulated Depreciation and Amortization	-328	-386
Net Book Value	293	303
Leasehold improvements	'	'
Premises and Equipment	'	'
Cost	298	342
Accumulated Depreciation and Amortization	-218	-242
Net Book Value	80	100
Furniture, fixtures and equipment	'	'
Premises and Equipment	'	'
Cost	670	709
Accumulated Depreciation and Amortization	-509	-557
Net Book Value	$161	$152

Premises_and_Equipment_and_Oth3

Premises and Equipment and Other Assets (Details 2) (Premises and equipment, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Premises and equipment	'	'	'
Rental, depreciation and amortization expenses	'	'	'
Rental expense of premises	$111	$85	$86
Less: rental income	9	8	8
Net rental expense	102	77	78
Depreciation and amortization of premises and equipment	$110	$102	$101

Premises_and_Equipment_and_Oth4

Premises and Equipment and Other Assets (Details 3) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Premises and Equipment and Other Assets	'
2014	$111
2015	107
2016	99
2017	87
2018	73
Thereafter	229
Total minimum lease payments	706
Minimum rental income due in the future under subleases	$2

Premises_and_Equipment_and_Oth5

Premises and Equipment and Other Assets (Details 4) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Premises and Equipment and Other Assets	'	'
Liability for asset retirement obligations	$6	$6

Premises_and_Equipment_and_Oth6

Premises and Equipment and Other Assets (Details 5) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Other Assets	'	'
Other investments	$2,211	$1,574
Prepaid expenses	509	173
Intangible assets	290	376
OREO	57	111
Other	1,787	2,587
Total other assets	$4,854	$4,821

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details) (USD $)

0 Months Ended

12 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Oct. 02, 2013

Apr. 01, 2013

Apr. 01, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 01, 2012

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Maximum

PCBC

PCBC

PB Capital Commercial Real Estate Division

PB Capital Commercial Real Estate Division

PB Capital Commercial Real Estate Division

First Bank Association Bank Services

Core deposit intangibles

Customer Relationships

Other intangibles assets

Maximum

PCBC

PCBC

PCBC

Goodwill and Other Intangible Assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

'

'

'

$3,228

$2,942

$2,457

'

$436

$413

$238

$227

'

$30

'

'

'

Intangible assets

'

'

'

'

'

'

'

'

'

'

'

1

'

29

10

6

Intangible assets amortization period

'

'

'

'

'

'

'40 years

'

'

'

'

'

'

'10 years

'10 years

'

Goodwill impairment recognized

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Total amortization expense

'

'

'

65

81

99

'

'

'

'

'

'

'

'

'

'

Impairment loss

'

'

'

'

'

$7

'

'

'

'

'

'

'

'

'

'

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Goodwill rollforward	'	'
Goodwill, beginning of year	$2,942	$2,457
Net change from business combinations	286	485
Goodwill, end of year	3,228	2,942
Retail Banking and Wealth Markets	'	'
Goodwill rollforward	'	'
Goodwill, end of year	1,527	'
Commercial Banking	'	'
Goodwill rollforward	'	'
Goodwill, end of year	1,034	'
Corporate Banking	'	'
Goodwill rollforward	'	'
Goodwill, end of year	149	'
Transaction Banking	'	'
Goodwill rollforward	'	'
Goodwill, end of year	251	'
Investment Banking and Markets	'	'
Goodwill rollforward	'	'
Goodwill, end of year	253	'
Asian Corporate Banking	'	'
Goodwill rollforward	'	'
Goodwill, end of year	14	'
Retail Banking	'	'
Goodwill rollforward	'	'
Goodwill, end of year	'	1,474
Pre Resegmentation Corporate Banking	'	'
Goodwill rollforward	'	'
Goodwill, end of year	'	1,454
Pacific Rim	'	'
Goodwill rollforward	'	'
Goodwill, end of year	'	$14

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets (Details 3) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Intangible Assets	'	'
Gross Carrying Amount	$869	$881
Accumulated Amortization	-579	-514
Net Carrying Amount	290	367
Other intangibles with an indefinite useful life, Gross carrying Amount	'	9
Total intangibles, Gross Carrying Amount	869	890
Total intangibles, Net Carrying Amount	290	376
Core deposit intangibles	'	'
Intangible Assets	'	'
Gross Carrying Amount	667	669
Accumulated Amortization	-530	-479
Net Carrying Amount	137	190
Trade names	'	'
Intangible Assets	'	'
Gross Carrying Amount	114	114
Accumulated Amortization	-16	-12
Net Carrying Amount	98	102
Customer Relationships	'	'
Intangible Assets	'	'
Gross Carrying Amount	63	75
Accumulated Amortization	-22	-17
Net Carrying Amount	41	58
Other intangibles assets	'	'
Intangible Assets	'	'
Gross Carrying Amount	25	23
Accumulated Amortization	-11	-6
Net Carrying Amount	$14	$17

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets (Details 4) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Schedule Of Estimated Future Amortization Expense	'	'
2014	$51	'
2015	41	'
2016	29	'
2017	24	'
2018	15	'
Thereafter	130	'
Total estimated amortization expense	290	367
Core deposit intangibles	'	'
Schedule Of Estimated Future Amortization Expense	'	'
2014	39	'
2015	30	'
2016	18	'
2017	14	'
2018	7	'
Thereafter	29	'
Total estimated amortization expense	137	'
Trade names	'	'
Schedule Of Estimated Future Amortization Expense	'	'
2014	4	'
2015	3	'
2016	3	'
2017	3	'
2018	3	'
Thereafter	82	'
Total estimated amortization expense	98	'
Customer Relationships	'	'
Schedule Of Estimated Future Amortization Expense	'	'
2014	5	'
2015	5	'
2016	5	'
2017	5	'
2018	4	'
Thereafter	17	'
Total estimated amortization expense	41	'
Other	'	'
Schedule Of Estimated Future Amortization Expense	'	'
2014	3	'
2015	3	'
2016	3	'
2017	2	'
2018	1	'
Thereafter	2	'
Total estimated amortization expense	$14	'

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Consolidated Assets	'	'
Interest Bearing Deposits in Banks	$4,329	$3,477
Loans Held for Investment, net	67,744	59,381
Other assets	4,854	4,821
Consolidated VIEs	'	'
Consolidated Assets	'	'
Interest Bearing Deposits in Banks	10	'
Loans Held for Investment, net	750	'
Other assets	270	'
Total assets	1,030	'
Consolidated Liabilities	'	'
Long-Term Debt	4	'
Total Liabilities	4	'
Consolidated VIEs | LIHC investments	'	'
Consolidated Assets	'	'
Interest Bearing Deposits in Banks	9	'
Other assets	262	'
Total assets	271	'
Consolidated Liabilities	'	'
Long-Term Debt	4	'
Total Liabilities	4	'
Number of LIHC investment fund	2	'
Consolidated VIEs | Leasing investments	'	'
Consolidated Assets	'	'
Interest Bearing Deposits in Banks	1	'
Loans Held for Investment, net	750	'
Other assets	8	'
Total assets	$759	'

Variable_Interest_Entities_Det1

Variable Interest Entities (Details 2) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Unconsolidated Assets	'	'
Securities Available for Sale	$15,817	$21,352
Loans Held for Investment	68,312	60,034
Other Assets	4,854	4,821
Unconsolidated Liabilities	'	'
Other Liabilities	1,675	2,099
Unconsolidated VIEs	'	'
Unconsolidated Assets	'	'
Securities Available for Sale	122	'
Loans Held for Investment	173	'
Other Assets	1,716	'
Total Assets	2,011	'
Unconsolidated Liabilities	'	'
Other Liabilities	445	'
Total Liabilities	445	'
Maximum Exposure to Loss	2,011	'
Unconsolidated VIEs | LIHC investments	'	'
Unconsolidated Assets	'	'
Securities Available for Sale	122	'
Loans Held for Investment	158	'
Other Assets	1,000	'
Total Assets	1,280	'
Unconsolidated Liabilities	'	'
Other Liabilities	445	'
Total Liabilities	445	'
Maximum Exposure to Loss	1,280	'
Unconsolidated VIEs | Leasing investments	'	'
Unconsolidated Assets	'	'
Other Assets	704	'
Total Assets	704	'
Unconsolidated Liabilities	'	'
Maximum Exposure to Loss	704	'
Unconsolidated VIEs | Other investments	'	'
Unconsolidated Assets	'	'
Loans Held for Investment	15	'
Other Assets	12	'
Total Assets	27	'
Unconsolidated Liabilities	'	'
Maximum Exposure to Loss	$27	'

Deposits_Details

Deposits (Details) (USD $)	Dec. 31, 2013
Deposits	'
Deposits of $100,000 and over	$3,400,000,000
Interest bearing time deposits with remaining term of greater than one year	$4,150,000,000

Deposits_Details_2

Deposits (Details 2) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Deposits	'
Due after one year through two years	$1,023
Due after two years through three years	1,291
Due after three years through four years	998
Due after four years through five years	794
Due after five years	44
Total	$4,150

Commercial_Paper_and_Other_Sho2

Commercial Paper and Other Short-Term Borrowings (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Commercial Paper and Short-Term Borrowings	'	'
Federal funds purchased and securities sold under repurchase agreements with weighted average interest rates of 0.07% and 0.96% at December 31, 2013 and December 31, 2012, respectively	$39	$123
Commercial paper, with weighted average interest rates of 0.19% and 0.20% at December 31, 2013 and December 31, 2012, respectively	2,524	1,240
Total commercial paper and other short-term borrowings	2,563	1,363
Federal funds purchased and securities sold under repurchase agreements	'	'
Commercial Paper and Short-Term Borrowings	'	'
Maximum outstanding at any month end	359	1,471
Average balance during the year	263	441
Weighted average interest rate during the year	0.12%	0.21%
Commercial paper	'	'
Commercial Paper and Short-Term Borrowings	'	'
Maximum outstanding at any month end	3,655	2,837
Average balance during the year	2,393	1,981
Weighted average interest rate during the year	0.18%	0.27%
Federal Home Loan Bank borrowings	'	'
Commercial Paper and Short-Term Borrowings	'	'
Maximum outstanding at any month end	'	2,500
Average balance during the year	'	739
Weighted average interest rate during the year	'	0.27%
Term federal funds purchased	'	'
Commercial Paper and Short-Term Borrowings	'	'
Maximum outstanding at any month end	269	270
Average balance during the year	50	51
Weighted average interest rate during the year	0.15%	0.18%
Other borrowed funds	'	'
Commercial Paper and Short-Term Borrowings	'	'
Maximum outstanding at any month end	'	36
Average balance during the year	$45	$42
Weighted average interest rate during the year	1.71%	0.89%

Commercial_Paper_and_Other_Sho3

Commercial Paper and Other Short-Term Borrowings (Details 2)	Dec. 31, 2013	Dec. 31, 2012
Federal funds purchased and securities sold under repurchase agreements	'	'
Commercial Paper and Short-Term Borrowings	'	'
Weighted average interest rate (as a percent)	0.07%	0.96%
Commercial paper	'	'
Commercial Paper and Short-Term Borrowings	'	'
Weighted average interest rate (as a percent)	0.19%	0.20%

Commercial_Paper_and_Other_Sho4

Commercial Paper and Other Short-Term Borrowings (Details 3) (USD $)	12 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Sep. 30, 2008
	Federal funds purchased and securities sold under repurchase agreements	Commercial paper	BTMU
Standby Letters of Credit	'	'	'
Revolving credit facility borrowing capacity	'	'	$500
Unsecured revolving credit facility years	'	'	'3 years
Weighted average remaining maturity days	'2 days	'76 days	'

LongTerm_Debt_Details

Long-Term Debt (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Jun. 18, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 27, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Jun. 18, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Jun. 28, 2013

Dec. 31, 2013

Sep. 26, 2013

Dec. 31, 2013

Sep. 26, 2013

Sep. 26, 2013

Sep. 26, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 26, 2013

Dec. 31, 2013

Sep. 26, 2013

Sep. 26, 2013

Dec. 31, 2013

Junior subordinated debt payable to trusts

Junior subordinated debt payable to trusts

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Union Bank, N.A. and other subsidiaries

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Bank

Floating rate

Floating rate

Senior debt

Senior debt

Senior debt

Subordinated Debt

Subordinated Debt

Subordinated Debt

Subordinated Debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Subordinated Debt

Subordinated Debt

Subordinated Debt

Subordinated Debt

Note payable

Note payable

Junior subordinated debt payable to trusts

Junior subordinated debt payable to trusts

Floating rate notes due to BTMU June 2023

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Senior debt

Subordinated Debt

Fixed rate 3.50% notes due June 2022

Fixed rate 3.50% notes due June 2022

Fixed rate 3.50% notes due June 2022

Fixed rate 5.25% notes due December 2013

Fixed rate 5.25% notes due December 2013

Floating rate subordinated debt due December 2023

Floating rate subordinated debt due December 2023

Federal Home Loan Bank advances

Federal Home Loan Bank advances

Federal Home Loan Bank advances

Floating rate notes due June 2014

Floating rate notes due June 2014

Floating rate notes due June 2014

Floating rate notes due June 2014

Fixed rate 2.125% notes due December 2013

Fixed rate 2.125% notes due December 2013

Fixed rate 3.00% notes due June 2016

Fixed rate 3.00% notes due June 2016

Fixed rate 2.125% notes due June 2017

Fixed rate 2.125% notes due June 2017

Fixed rate 2.125% notes due June 2017

Fixed rate 5.95% notes due May 2016

Fixed rate 5.95% notes due May 2016

Floating rate notes due to BTMU June 2023

Floating rate notes due to BTMU June 2023

Fixed rate 6.03% notes due July 2014 (related to consolidated VIE)

Fixed rate 6.03% notes due July 2014 (related to consolidated VIE)

Capital Lease Obligations

Capital Lease Obligations

London Interbank Offered Rate LIBOR

Minimum

Fixed rate 1.50% notes due September 2016

Fixed rate 1.50% notes due September 2016

Fixed rate 1.50% notes due September 2016

Fixed rate 1.50% notes due September 2016

Floating rate notes due September 2016

Floating rate notes due September 2016

Floating rate notes due September 2016

Fixed rate 2.625% notes due September 2018

Fixed rate 2.625% notes due September 2018

Fixed rate 2.625% notes due September 2018

Fixed rate 2.625% notes due September 2018

Minimum

London Interbank Offered Rate LIBOR

London Interbank Offered Rate LIBOR

London Interbank Offered Rate LIBOR

London Interbank Offered Rate LIBOR

Minimum

Maximum

London Interbank Offered Rate LIBOR

Minimum

Maximum

Debt Instrument

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt

$6,547,000,000

$5,622,000,000

$66,000,000

$66,000,000

$763,000,000

$869,000,000

'

$397,000,000

$397,000,000

'

$406,000,000

$300,000,000

'

$5,784,000,000

$4,753,000,000

$800,000,000

$2,100,000,000

'

$300,000,000

$300,000,000

'

'

'

$399,000,000

$699,000,000

$699,000,000

'

$499,000,000

$499,000,000

$718,000,000

$729,000,000

$750,000,000

'

$4,000,000

$6,000,000

$15,000,000

$21,000,000

'

'

'

'

$499,000,000

'

'

'

$500,000,000

'

'

$1,000,000,000

'

'

'

Long-term debt

'

'

'

'

'

'

400,000,000

'

'

'

'

'

300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000,000

'

'

'

'

'

'

'

'

'

'

'

750,000,000

'

500,000,000

'

'

'

500,000,000

'

'

1,000,000,000

'

'

'

'

Debt instrument, Fixed interest rate (as a percent)

'

'

'

'

'

'

'

3.50%

3.50%

5.25%

5.25%

'

'

'

'

'

'

'

'

'

'

'

2.13%

2.13%

3.00%

3.00%

'

2.13%

2.13%

5.95%

5.95%

'

'

6.03%

6.03%

'

'

'

'

'

'

1.50%

'

'

'

'

'

'

2.63%

'

'

'

Debt instrument, weighted-average interest rate (as a percent)

'

'

2.60%

2.66%

'

'

'

'

'

'

'

1.63%

'

'

'

2.55%

1.39%

'

1.19%

1.26%

'

'

'

'

'

'

'

'

'

'

'

1.45%

'

'

'

4.88%

4.72%

'

'

'

'

'

'

'

'

1.00%

'

'

'

'

'

'

Variable interest rate

'

'

'

'

'

'

'

'

'

'

'

'three-month LIBOR

'

'

'

'

'

'three-month LIBOR

'

'

'three-month LIBOR

'three-month LIBOR

'

'

'

'

'

'

'

'

'

'

'three-month LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'three-month LIBOR

'

'

'

'

'

Interest rate above variable interest rate (as a percent)

'

'

'

'

'

'

'

'

'

'

'

1.38%

'

'

'

'

'

'

'

'

0.95%

0.95%

'

'

'

'

'

'

'

'

'

'

1.20%

'

'

'

'

'

'

'

'

'

'

'

'

'

0.75%

'

'

'

'

'

Issuance price to purchasers as a percentage of principal amount (as a percent)

'

'

'

'

'

'

99.20%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

99.70%

'

'

'

'

'

'

'

'

'

'

'

'

'

99.75%

'

'

'

100.00%

'

'

99.98%

'

'

'

'

Redemption price as a percentage of principal amount (as a percent)

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

100.00%

'

'

'

'

Notice period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'30 days

'60 days

'

'

'

'

'

'30 days

'60 days

'

Authorized amount under the bank note program

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,000,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maturity term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'5 years

Amount available for issuance under the bank note program

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,700,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reset period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'90 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Federal Home Loan Bank advances

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

800,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Federal Home Loan Bank advances, weighted average remaining maturity period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'22 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Federal Home Loan advances, collateral pledged

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$50,800,000,000

$44,500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_Measurement_and_Fai2

Fair Value Measurement and Fair Value of Financial Instruments (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair value measurements	'	'
Trading account assets	$851	$1,208
Securities available for sale	15,809	'
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	'	'
Fair value measurements	'	'
Securities available for sale	8,900	'
Residential mortgage-backed securities, Privately issued	'	'
Fair value measurements	'	'
Securities available for sale	222	'
Commercial mortgage-backed securities	'	'
Fair value measurements	'	'
Securities available for sale	1,870	'
Collateralized loan obligations	'	'
Fair value measurements	'	'
Securities available for sale	2,673	'
Asset-backed and other	'	'
Fair value measurements	'	'
Securities available for sale	35	'
Other debt securities, Direct bank purchase bonds	'	'
Fair value measurements	'	'
Securities available for sale	1,960	'
Other debt securities, Other	'	'
Fair value measurements	'	'
Securities available for sale	76	'
Level 3	'	'
Fair value measurements	'	'
Other assets	3	3
Fair Value Measurements Recurring	'	'
Fair value measurements	'	'
Trading account assets	851	1,208
Securities available for sale	15,817	21,352
Other assets	10	4
Total assets	16,678	22,564
Percentage of Total	100.00%	100.00%
Percentage of Total Company Assets	16.00%	23.00%
Trading account liabilities	540	895
FDIC clawback liability	96	92
Other liabilities	113	95
Total liabilities	653	990
Percentage of Total	100.00%	100.00%
Percentage of Total Company Liabilities	1.00%	1.00%
Fair Value Measurements Recurring | U.S. Treasury	'	'
Fair value measurements	'	'
Trading account assets	8	1
Fair Value Measurements Recurring | U.S. government-sponsored agencies	'	'
Fair value measurements	'	'
Trading account assets	116	113
Securities available for sale	73	885
Fair Value Measurements Recurring | State and municipal	'	'
Fair value measurements	'	'
Trading account assets	5	15
Fair Value Measurements Recurring | Other loans	'	'
Fair value measurements	'	'
Trading account assets	140	'
Fair Value Measurements Recurring | Commercial paper	'	'
Fair value measurements	'	'
Trading account assets	'	10
Fair Value Measurements Recurring | Interest rate derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	501	988
Trading account liabilities	230	602
Fair Value Measurements Recurring | Commodity derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	10	40
Trading account liabilities	28	98
Fair Value Measurements Recurring | Foreign exchange derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	15	41
Trading account liabilities	18	65
Fair Value Measurements Recurring | Equity Derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	56	'
Trading account liabilities	254	103
Fair Value Measurements Recurring | Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	'	'
Fair value measurements	'	'
Securities available for sale	8,900	13,333
Fair Value Measurements Recurring | Residential mortgage-backed securities, Privately issued	'	'
Fair value measurements	'	'
Securities available for sale	222	443
Fair Value Measurements Recurring | Commercial mortgage-backed securities	'	'
Fair value measurements	'	'
Securities available for sale	1,870	2,971
Fair Value Measurements Recurring | Collateralized loan obligations	'	'
Fair value measurements	'	'
Securities available for sale	2,673	1,959
Fair Value Measurements Recurring | Asset-backed and other	'	'
Fair value measurements	'	'
Securities available for sale	35	146
Fair Value Measurements Recurring | Other debt securities, Direct bank purchase bonds	'	'
Fair value measurements	'	'
Securities available for sale	1,960	1,438
Fair Value Measurements Recurring | Other debt securities, Other	'	'
Fair value measurements	'	'
Securities available for sale	76	158
Fair Value Measurements Recurring | Equity securities	'	'
Fair value measurements	'	'
Securities available for sale	8	19
Fair Value Measurements Recurring | Interest rate hedging contracts	'	'
Fair value measurements	'	'
Other assets	8	4
Other liabilities	13	'
Fair Value Measurements Recurring | Other derivative contracts	'	'
Fair value measurements	'	'
Other assets	2	'
Other liabilities	4	3
Fair Value Measurements Recurring | Securities sold, not yet purchased	'	'
Fair value measurements	'	'
Trading account liabilities	10	27
Fair Value Measurements Recurring | Level 1	'	'
Fair value measurements	'	'
Trading account assets	2	1
Securities available for sale	8	19
Total assets	10	20
Trading account liabilities	4	6
Total liabilities	4	6
Percentage of Total	1.00%	1.00%
Fair Value Measurements Recurring | Level 1 | Interest rate derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	1	'
Trading account liabilities	3	5
Fair Value Measurements Recurring | Level 1 | Foreign exchange derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	1	1
Trading account liabilities	1	1
Fair Value Measurements Recurring | Level 1 | Equity securities	'	'
Fair value measurements	'	'
Securities available for sale	8	19
Fair Value Measurements Recurring | Level 2	'	'
Fair value measurements	'	'
Trading account assets	1,071	1,416
Securities available for sale	13,791	19,834
Other assets	9	29
Total assets	14,871	21,279
Percentage of Total	89.00%	94.00%
Percentage of Total Company Assets	14.00%	22.00%
Trading account liabilities	695	1,202
Other liabilities	14	'
Total liabilities	709	1,202
Percentage of Total	109.00%	121.00%
Percentage of Total Company Liabilities	1.00%	2.00%
Fair Value Measurements Recurring | Level 2 | U.S. Treasury	'	'
Fair value measurements	'	'
Trading account assets	8	1
Fair Value Measurements Recurring | Level 2 | U.S. government-sponsored agencies	'	'
Fair value measurements	'	'
Trading account assets	116	113
Securities available for sale	73	885
Fair Value Measurements Recurring | Level 2 | State and municipal	'	'
Fair value measurements	'	'
Trading account assets	5	15
Fair Value Measurements Recurring | Level 2 | Other loans	'	'
Fair value measurements	'	'
Trading account assets	140	'
Fair Value Measurements Recurring | Level 2 | Commercial paper	'	'
Fair value measurements	'	'
Trading account assets	'	10
Fair Value Measurements Recurring | Level 2 | Interest rate derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	705	1,075
Trading account liabilities	606	1,004
Fair Value Measurements Recurring | Level 2 | Commodity derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	67	137
Trading account liabilities	53	110
Fair Value Measurements Recurring | Level 2 | Foreign exchange derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	30	65
Trading account liabilities	26	61
Fair Value Measurements Recurring | Level 2 | Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	'	'
Fair value measurements	'	'
Securities available for sale	8,900	13,333
Fair Value Measurements Recurring | Level 2 | Residential mortgage-backed securities, Privately issued	'	'
Fair value measurements	'	'
Securities available for sale	222	443
Fair Value Measurements Recurring | Level 2 | Commercial mortgage-backed securities	'	'
Fair value measurements	'	'
Securities available for sale	1,870	2,971
Fair Value Measurements Recurring | Level 2 | Collateralized loan obligations	'	'
Fair value measurements	'	'
Securities available for sale	2,673	1,959
Fair Value Measurements Recurring | Level 2 | Asset-backed and other	'	'
Fair value measurements	'	'
Securities available for sale	35	146
Fair Value Measurements Recurring | Level 2 | Other debt securities, Other	'	'
Fair value measurements	'	'
Securities available for sale	18	97
Fair Value Measurements Recurring | Level 2 | Interest rate hedging contracts	'	'
Fair value measurements	'	'
Other assets	8	28
Other liabilities	13	'
Fair Value Measurements Recurring | Level 2 | Other derivative contracts	'	'
Fair value measurements	'	'
Other assets	1	1
Other liabilities	1	'
Fair Value Measurements Recurring | Level 2 | Securities sold, not yet purchased	'	'
Fair value measurements	'	'
Trading account liabilities	10	27
Fair Value Measurements Recurring | Level 3	'	'
Fair value measurements	'	'
Trading account assets	271	136
Securities available for sale	2,018	1,499
Other assets	1	'
Total assets	2,290	1,635
Percentage of Total	14.00%	7.00%
Percentage of Total Company Assets	2.00%	1.00%
Trading account liabilities	264	136
FDIC clawback liability	96	92
Other liabilities	99	95
Total liabilities	363	231
Percentage of Total	55.00%	23.00%
Fair Value Measurements Recurring | Level 3 | Interest rate derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	7	'
Fair Value Measurements Recurring | Level 3 | Commodity derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	9	30
Trading account liabilities	8	30
Fair Value Measurements Recurring | Level 3 | Foreign exchange derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	2	3
Trading account liabilities	2	3
Fair Value Measurements Recurring | Level 3 | Equity Derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	253	103
Trading account liabilities	254	103
Fair Value Measurements Recurring | Level 3 | Other debt securities, Direct bank purchase bonds	'	'
Fair value measurements	'	'
Securities available for sale	1,960	1,438
Fair Value Measurements Recurring | Level 3 | Other debt securities, Other	'	'
Fair value measurements	'	'
Securities available for sale	58	61
Fair Value Measurements Recurring | Level 3 | Other derivative contracts	'	'
Fair value measurements	'	'
Other assets	1	'
Other liabilities	3	3
Fair Value Measurements Recurring | Netting Adjustment	'	'
Fair value measurements	'	'
Trading account assets	-493	-345
Other assets	'	-25
Total assets	-493	-370
Percentage of Total	-3.00%	-1.00%
Trading account liabilities	-423	-449
Total liabilities	-423	-449
Percentage of Total	-65.00%	-45.00%
Percentage of Total Company Liabilities	'	-1.00%
Fair Value Measurements Recurring | Netting Adjustment | Interest rate derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	-212	-87
Trading account liabilities	-379	-407
Fair Value Measurements Recurring | Netting Adjustment | Commodity derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	-66	-127
Trading account liabilities	-33	-42
Fair Value Measurements Recurring | Netting Adjustment | Foreign exchange derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	-18	-28
Trading account liabilities	-11	'
Fair Value Measurements Recurring | Netting Adjustment | Equity Derivative contracts	'	'
Fair value measurements	'	'
Trading account assets	-197	-103
Fair Value Measurements Recurring | Netting Adjustment | Interest rate hedging contracts	'	'
Fair value measurements	'	'
Other assets	'	-24
Fair Value Measurements Recurring | Netting Adjustment | Other derivative contracts	'	'
Fair value measurements	'	'
Other assets	'	($1)

Fair_Value_Measurement_and_Fai3

Fair Value Measurement and Fair Value of Financial Instruments (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Trading Assets	'	'
Reconciliation of assets measured using significant unobservable inputs	'	'
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	$136	'
Total gains (losses) (realized/unrealized) included in income before taxes	119	-18
Purchases/additions, assets	24	8
Settlements	-8	-7
Transfers into Level 3, assets	'	153
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, end of period	271	136
Changes in unrealized gains (losses) included in income before taxes for assets still held at end of period	119	-18
Securities Available for Sale	'	'
Reconciliation of assets measured using significant unobservable inputs	'	'
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	1,499	48
Total gains (losses) (realized/unrealized) included in other comprehensive income	28	-35
Purchases/additions, assets	700	1,619
Sales	-14	'
Settlements	-195	-133
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, end of period	2,018	1,499
Other assets	'	'
Reconciliation of assets measured using significant unobservable inputs	'	'
Purchases/additions, assets	1	'
Reconciliation of asset balance at fair value on a recurring basis using significant unobservable inputs, end of period	$1	'

Fair_Value_Measurement_and_Fai4

Fair Value Measurement and Fair Value of Financial Instruments (Details 3) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Trading Liabilities	'	'
Reconciliation of assets measured using significant unobservable inputs	'	'
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	($136)	'
Total gains (losses) (realized/unrealized) included in income before taxes	-120	18
Sales	-16	-8
Settlements	8	7
Transfers into Level 3, liability	'	-153
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, ending of period	-264	-136
Changes in unrealized gains (losses) included in income before taxes for liabilities still held at end of period	-120	18
Other Liabilities	'	'
Reconciliation of assets measured using significant unobservable inputs	'	'
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	-95	-51
Total gains (losses) (realized/unrealized) included in income before taxes	-4	-41
Purchases/additions, liability	'	-3
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, ending of period	-99	-95
Changes in unrealized gains (losses) included in income before taxes for liabilities still held at end of period	($4)	($41)

Fair_Value_Measurement_and_Fai5

Fair Value Measurement and Fair Value of Financial Instruments (Details 4) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified			Other debt securities, Direct bank purchase bonds	Other debt securities, Direct bank purchase bonds	Other debt securities, Direct bank purchase bonds	Other debt securities, Direct bank purchase bonds	Other debt securities, Direct bank purchase bonds	Level 3
					Minimum	Maximum	Weighted Average	Other debt securities, Direct bank purchase bonds
					Return on equity	Return on equity	Return on equity
Significant unobservable inputs, Level 3 assets	'	'	'	'	'	'	'	'
Market-required return on capital (as a percent)	'	'	'	'	8.00%	10.00%	9.70%	'
Probability of default (as a percent)	'	'	'	'	0.00%	25.00%	0.60%	'
Loss severity (as a percent)	'	'	'	'	10.00%	75.00%	32.80%	'
Securities available for sale	$15,817	$21,352	$1,960	$1,438	'	'	'	$1,960

Fair_Value_Measurement_and_Fai6

Fair Value Measurement and Fair Value of Financial Instruments (Details 5) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified			FDIC clawback liability	FDIC clawback liability	FDIC clawback liability	Level 3
			Minimum	Maximum	Weighted Average	FDIC clawback liability
			Discounted cash flow	Discounted cash flow	Discounted cash flow
Significant unobservable inputs, Level 3 assets	'	'	'	'	'	'
Probability of default (as a percent)	'	'	0.10%	100.00%	60.40%	'
Loss severity (as a percent)	'	'	0.00%	100.00%	39.50%	'
Other liabilities	$1,675	$2,099	'	'	'	$96

Fair_Value_Measurement_and_Fai7

Fair Value Measurement and Fair Value of Financial Instruments (Details 6) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loans:	'	'
Impaired loans	$608	$626
Loss Impaired loans	-47	-88
Other assets:	'	'
OREO	57	111
Loss on OREO	-11	-27
Loss on Private equity investments	-5	-2
Loss, Total	-63	-117
Fair Value Measurements, Nonrecurring	'	'
Loans:	'	'
Impaired loans	59	119
Other assets:	'	'
OREO	21	53
Total	80	172
Fair Value Measurements, Nonrecurring | Level 3	'	'
Loans:	'	'
Impaired loans	59	119
Other assets:	'	'
OREO	21	53
Total	$80	$172

Fair_Value_Measurement_and_Fai8

Fair Value Measurement and Fair Value of Financial Instruments (Details 7) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Assets	'	'
Securities held to maturity	$6,439	$1,135
Level 1	'	'
Assets	'	'
Cash and cash equivalents	6,203	5,491
Level 2	'	'
Assets	'	'
Securities held to maturity	6,439	1,135
Liabilities	'	'
Deposits	80,228	74,524
Commercial paper and other short-term borrowings	2,563	1,363
Long-term debt	6,709	5,861
Level 3	'	'
Assets	'	'
Loans held for investment, net of allowance for loan losses	68,132	59,613
FDIC indemnification asset	95	151
Other assets	3	3
Off-Balance Sheet Instruments	'	'
Commitments to extend credit and standby and commercial letters of credit	273	262
Carrying Amount	'	'
Assets	'	'
Cash and cash equivalents	6,203	5,491
Securities held to maturity	6,509	1,103
Loans held for investment, net of allowance for loan losses	66,898	58,284
FDIC indemnification asset	141	338
Other assets	3	3
Liabilities	'	'
Deposits	80,101	74,304
Commercial paper and other short-term borrowings	2,563	1,363
Long-term debt	6,547	5,622
Off-Balance Sheet Instruments	'	'
Commitments to extend credit and standby and commercial letters of credit	273	262
Fair Value	'	'
Assets	'	'
Cash and cash equivalents	6,203	5,491
Securities held to maturity	6,439	1,135
Loans held for investment, net of allowance for loan losses	68,132	59,613
FDIC indemnification asset	95	151
Other assets	3	3
Liabilities	'	'
Deposits	80,228	74,524
Commercial paper and other short-term borrowings	2,563	1,363
Long-term debt	6,709	5,861
Off-Balance Sheet Instruments	'	'
Commitments to extend credit and standby and commercial letters of credit	$273	$262

Derivative_Instruments_and_Oth2

Derivative Instruments and Other Financial Instruments Used For Hedging (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	$64,438	$60,118
Fair Value, Asset Derivatives	1,085	1,443
Fair Value, Liability Derivatives	970	1,320
Not designated as hedging instruments | Trading derivatives	'	'
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	59,953	51,609
Fair Value, Asset Derivatives	1,075	1,414
Fair Value, Liability Derivatives	953	1,317
Not designated as hedging instruments | Other risk management	'	'
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	185	109
Fair Value, Asset Derivatives	2	1
Fair Value, Liability Derivatives	4	3
Net losses on derivatives included in other noninterest income	6	7
Interest rate derivative contracts | Designated as hedging instrument | Maximum	'	'
Derivative Instruments and Other Financial Instruments	'	'
Fair Value, Liability Derivatives	'	1
Interest rate derivative contracts | Not designated as hedging instruments | Trading derivatives	'	'
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	44,427	37,790
Fair Value, Asset Derivatives	713	1,075
Fair Value, Liability Derivatives	609	1,009
Interest rate derivative contracts | Cash Flow Hedges	'	'
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	4,300	8,400
Fair Value, Asset Derivatives	8	28
Fair Value, Liability Derivatives	13	'
Commodity derivative contracts | Not designated as hedging instruments | Trading derivatives	'	'
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	5,714	5,595
Fair Value, Asset Derivatives	76	167
Fair Value, Liability Derivatives	61	140
Foreign exchange derivative contracts | Not designated as hedging instruments | Trading derivatives	'	'
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	5,645	4,593
Fair Value, Asset Derivatives	33	69
Fair Value, Liability Derivatives	29	65
Equity Derivative contracts | Not designated as hedging instruments | Trading derivatives	'	'
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	4,027	3,631
Fair Value, Asset Derivatives	253	103
Fair Value, Liability Derivatives	254	103
Other derivative contracts | Not designated as hedging instruments | Trading derivatives	'	'
Derivative Instruments and Other Financial Instruments	'	'
Derivative Notional Amount	$140	'

Derivative_Instruments_and_Oth3

Derivative Instruments and Other Financial Instruments Used For Hedging (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Cash flow hedges	'	'
Derivative Notional Amount	$64,438	$60,118
Income from accumulated other comprehensive income expected to be reclassified to net interest income	69	'
Cash Flow Hedges | Weighted average	'	'
Cash flow hedges	'	'
Weighted average remaining life of the currently active cash flow hedges	'4 years 7 days	'
Cash Flow Hedges | LIBOR indexed loans | Interest rate swaps	'	'
Cash flow hedges	'	'
Derivative Notional Amount	$4,300	'

Derivative_Instruments_and_Oth4

Derivative Instruments and Other Financial Instruments Used For Hedging (Details 3) (Cash Flow Hedges, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amount and location of net gains and losses	'	'
Amount of Gain (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)	$29	$82
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	43	15
Interest rate derivative contracts	'	'
Amount and location of net gains and losses	'	'
Amount of Gain (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)	29	82
Interest rate derivative contracts | Interest income	'	'
Amount and location of net gains and losses	'	'
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	44	17
Interest rate derivative contracts | Interest expense	'	'
Amount and location of net gains and losses	'	'
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	-1	-2
Interest rate derivative contracts | Noninterest expense | Maximum	'	'
Amount and location of net gains and losses	'	'
Gain (Loss) Recognized in Income on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$1	$1

Derivative_Instruments_and_Oth5

Derivative Instruments and Other Financial Instruments Used For Hedging (Details 4) (Trading Derivatives, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Trading Derivatives	'	'
Gain or (Loss) Recognized in Income on Derivative Instruments	$50	$97
Interest rate derivative contracts	'	'
Trading Derivatives	'	'
Gain or (Loss) Recognized in Income on Derivative Instruments	30	56
Equity contracts	'	'
Trading Derivatives	'	'
Gain or (Loss) Recognized in Income on Derivative Instruments	'	14
Foreign exchange derivative contracts	'	'
Trading Derivatives	'	'
Gain or (Loss) Recognized in Income on Derivative Instruments	18	22
Commodity contracts	'	'
Trading Derivatives	'	'
Gain or (Loss) Recognized in Income on Derivative Instruments	$2	$5

Derivative_Instruments_and_Oth6

Derivative Instruments and Other Financial Instruments Used For Hedging (Details 5) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financial Assets	'	'
Gross Amounts of Recognized Assets, Derivative assets	$1,085	$1,443
Gross Amounts Offset in Balance Sheet, Derivative assets	493	370
Net Amounts Presented in Balance Sheet, Derivative assets	592	1,073
Gross Amounts Not Offset In Balance Sheet, Financial Instruments, Derivative assets	79	21
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Pledged, Derivative assets	'	2
Net Amount, Derivative assets	513	1,050
Gross Amounts of Recognized Assets, Securities purchased under resale agreements	10	19
Net Amounts Presented in Balance Sheet, Securities purchased under resale agreements	10	19
Gross Amount Not Offset in Balance Sheet, Financial Instruments, Securities purchased under repurchase agreements	10	19
Gross Amounts of Recognized Assets, Financial Assets	1,095	1,462
Gross Amounts Offset in Balance Sheet, Financial Assets	493	370
Net Amounts Presented in Balance Sheet, Financial Assets	602	1,092
Gross Amounts Not Offset In Balance Sheet, Financial Instruments, Financial Assets	89	40
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Pledged, Financial Assets	'	2
Net Amount, Financial Assets	513	1,050
Financial Liabilities	'	'
Gross Amounts of Recognized Liabilities, Derivative liabilities	970	1,320
Gross Amounts Offset in Balance Sheet, Derivative liabilities	423	449
Net Amounts Presented in Balance Sheet, Derivative liabilities	547	871
Gross Amount Not Offset in Balance Sheet, Financial Instruments, Derivative liabilities	144	491
Gross Amount Not Offset in Balance Sheet, Cash Collateral Pledged, Derivative liabilities	'	121
Net Amount, Derivative liabilities	403	259
Gross Amounts of Recognized Liabilities, Securities sold under repurchase agreements	8	5
Net Amounts Presented in Balance Sheet, Securities sold under repurchase agreements	8	5
Gross Amount Not Offset in Balance Sheet, Financial Instruments, Securities sold under repurchase agreements	8	5
Gross Amounts of Recognized Liabilities, Financial Liabilities	978	1,325
Gross Amounts Offset in Balance Sheet, Financial Liabilities	423	449
Net Amounts Presented in Balance Sheet, Financial Liabilities	555	876
Gross Amount Not Offset in Balance Sheet, Financial Instruments, Financial Liabilities	152	496
Gross Amount Not Offset in Balance Sheet, Cash Collateral Pledged, Financial Liabilities	'	121
Net Amount, Financial Liabilities	$403	$259

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Loss	'	'	'
Unrealized net gains (losses) on hedges arising during the period, Before Tax Amount	$29	$82	($5)
Less: Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt, Before Tax Amount	-43	-15	11
Net change, Before Tax Amount	-14	67	6
Unrealized holding gains (losses) arising during the period on securities available for sale, Before Tax Amount	-401	187	204
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net, Before Tax Amount	-178	-107	-58
Reclassification of unrealized (gains) losses on held to maturity securities transferred to securities available for sale, Before Tax Amount	'	301	'
Less: accretion of fair value adjustment on securities available for sale, Before Tax Amount	-75	-9	-5
Less: accretion of fair value adjustment on held to maturity securities, Before Tax Amount	-12	-24	-29
Less: amortization of net unrealized (gains) losses on held to maturity securities, Before Tax Amount	-137	90	104
Net change, Before Tax Amount	-803	438	216
Foreign currency translation adjustment, Before Tax Amount	-7	2	-1
Amortization of transition amount, Before Tax Amount	'	1	1
Recognized net actuarial (gain) loss, Before Tax Amount	116	99	51
Pension and other benefits arising during the year, Before Tax Amount	526	-121	-491
Net change, Before Tax Amount	642	-21	-439
Net change in accumulated other comprehensive loss, Before Tax Amount	-182	486	-218
Unrealized net gains (losses) on hedges arising during the period, Tax Effect	-11	-32	2
Less: Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt, Tax Effect	17	6	-4
Net change, Tax Effect	6	-26	-2
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax Effect	157	-74	-80
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net, Tax Effect	70	42	23
Reclassification of unrealized (gains) losses on held to maturity securities transferred to securities available for sale, Tax Effect	'	-118	'
Less: accretion of fair value adjustment on securities available for sale, Tax Effect	30	4	2
Less: accretion of fair value adjustment on held to maturity securities, Tax Effect	5	9	11
Less: amortization of net unrealized (gains) losses on held to maturity securities, Tax Effect	54	-35	-41
Net change, Tax Effect	316	-172	-85
Foreign currency translation adjustment, Tax Effect	3	-1	'
Amortization of transition amount, Tax Effect	'	-1	'
Recognized net actuarial (gain) loss, Tax Effect	-46	-39	-20
Pension and other benefits arising during the year, Tax Effect	-207	48	193
Net change, Tax Effect	-253	8	173
Net change in accumulated other comprehensive loss, Tax Effect	72	-191	86
Unrealized net gains (losses) on hedges arising during the period, Net of Tax	18	50	-3
Less: Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt, Net of Tax	-26	-9	7
Net change, Net of Tax	-8	41	4
Unrealized holding gains (losses) arising during the period on securities available for sale, Net of Tax	-244	113	124
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net, Net of Tax	-108	-65	-35
Reclassification of unrealized (gains) losses on held to maturity securities transferred to securities available for sale, Net of Tax	'	183	'
Less: accretion of fair value adjustment on securities available for sale, Net of Tax	-45	-5	-3
Less: accretion of fair value adjustment on held to maturity securities, Net of Tax	-7	-15	-18
Less: amortization of net unrealized (gains) losses on held to maturity securities, Net of Tax	-83	55	63
Net change, Net of Tax	-487	266	131
Foreign currency translation adjustment, Net of Tax	-4	1	-1
Amortization of transition amount, Net of Tax	'	'	1
Recognized net actuarial (gain) loss, Net of Tax	70	60	31
Pension and other benefits arising during the year, Net of Tax	319	-73	-298
Net change, Net of Tax	389	-13	-266
Net change in accumulated other comprehensive loss, Net of Tax	($110)	$295	($132)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in accumulated other comprehensive loss balances:	'	'	'
Accumulated Other Comprehensive Loss, Beginning Balance	($514)	($809)	($677)
Accumulated Other Comprehensive Loss, Other comprehensive income before reclassifications	-365	199	162
Accumulated Other Comprehensive Loss, Amounts reclassified from accumulated other comprehensive loss	255	96	-294
Accumulated Other Comprehensive Loss, Ending Balance	-624	-514	-809
Net Unrealized Gains (Losses) on Cash Flow Hedges	'	'	'
Change in accumulated other comprehensive loss balances:	'	'	'
Accumulated Other Comprehensive Loss, Beginning Balance	24	-17	-21
Accumulated Other Comprehensive Loss, Other comprehensive income before reclassifications	18	50	-3
Accumulated Other Comprehensive Loss, Amounts reclassified from accumulated other comprehensive loss	-26	-9	7
Accumulated Other Comprehensive Loss, Ending Balance	16	24	-17
Net Unrealized Gains (Losses) on Securities	'	'	'
Change in accumulated other comprehensive loss balances:	'	'	'
Accumulated Other Comprehensive Loss, Beginning Balance	159	-107	-238
Accumulated Other Comprehensive Loss, Other comprehensive income before reclassifications	-379	148	166
Accumulated Other Comprehensive Loss, Amounts reclassified from accumulated other comprehensive loss	-108	118	-35
Accumulated Other Comprehensive Loss, Ending Balance	-328	159	-107
Foreign Currency Translation Adjustment	'	'	'
Change in accumulated other comprehensive loss balances:	'	'	'
Accumulated Other Comprehensive Loss, Beginning Balance	1	'	1
Accumulated Other Comprehensive Loss, Other comprehensive income before reclassifications	-4	1	-1
Accumulated Other Comprehensive Loss, Ending Balance	-3	1	'
Pension and Other Benefits Adjustment	'	'	'
Change in accumulated other comprehensive loss balances:	'	'	'
Accumulated Other Comprehensive Loss, Beginning Balance	-698	-685	-419
Accumulated Other Comprehensive Loss, Amounts reclassified from accumulated other comprehensive loss	389	-13	-266
Accumulated Other Comprehensive Loss, Ending Balance	($309)	($698)	($685)

Management_Stock_Plans_Details

Management Stock Plans (Details) (USD $)	0 Months Ended						12 Months Ended
	Jul. 15, 2013	Apr. 15, 2013	Jul. 15, 2012	Apr. 15, 2012	Jul. 15, 2011	Apr. 15, 2011	Dec. 31, 2013	Dec. 31, 2012
Management Stock Plans	'	'	'	'	'	'	'	'
Shares authorized	'	'	'	'	'	'	0	'
Stock Bonus Plan | Restricted Stock Units	'	'	'	'	'	'	'	'
Management Stock Plans	'	'	'	'	'	'	'	'
Units Granted	78,725	3,656,340	74,175	4,816,795	180,740	4,754,105	3,735,065	4,890,970
Fair Value of Stock	$6.67	$6.66	$4.72	$4.78	$4.94	$4.69	'	'
Vesting Duration	'3 years	'3 years	'3 years	'3 years	'3 years	'3 years	'	'

Management_Stock_Plans_Details1

Management Stock Plans (Details 2) (Stock Bonus Plan, Restricted Stock Units)	0 Months Ended						12 Months Ended
	Jul. 15, 2013	Apr. 15, 2013	Jul. 15, 2012	Apr. 15, 2012	Jul. 15, 2011	Apr. 15, 2011	Dec. 31, 2013	Dec. 31, 2012
Stock Bonus Plan | Restricted Stock Units	'	'	'	'	'	'	'	'
Restricted Stock Units rollforward	'	'	'	'	'	'	'	'
Units outstanding, beginning of year	'	'	'	'	'	'	8,857,884	7,138,334
Granted	78,725	3,656,340	74,175	4,816,795	180,740	4,754,105	3,735,065	4,890,970
Vested	'	'	'	'	'	'	-4,325,661	-2,920,392
Forfeited	'	'	'	'	'	'	-416,271	-251,028
Units outstanding, end of year	'	'	'	'	'	'	7,851,017	8,857,884

Management_Stock_Plans_Details2

Management Stock Plans (Details 3) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'
Compensation costs	$21	$18	$15
Tax benefit	8	7	6
Unrecognized compensation costs	$27	$26	$22

Employee_Pension_and_Other_Pos2

Employee Pension and Other Postretirement Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Service Period required for eligibility	'1 year	'
Change in fair value of plan assets	'	'
Fair value of plan assets, beginning of year	$2,019	$1,757
Actual return on plan assets	391	254
Employer contributions	380	150
Benefits paid	-74	-142
Fair value of plan assets, end of year	2,716	2,019
Pension Benefits | Minimum	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Service Period required for vesting	'3 years	'
Pension Benefits | Maximum	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Service Period required for vesting	'5 years	'
Other Benefits	'	'
Change in fair value of plan assets	'	'
Fair value of plan assets, beginning of year	210	172
Actual return on plan assets	37	23
Acquisition	'	16
Employer contributions	12	13
Plan participants' contributions	7	6
Benefits paid	-21	-20
Fair value of plan assets, end of year	$245	$210
Other Benefits | Minimum	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Future cost-sharing changes	25.00%	'
Other Benefits | Maximum	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Future cost-sharing changes	50.00%	'

Employee_Pension_and_Other_Pos3

Employee Pension and Other Postretirement Benefits (Details 2)	12 Months Ended
	Dec. 31, 2013
Pension Benefits | Equity securities	'
Pension Plan and Other Postretirement Benefits Plan	'
Target plan asset allocation	63.00%
Pension Benefits | Debt Securities	'
Pension Plan and Other Postretirement Benefits Plan	'
Target plan asset allocation	25.00%
Pension Benefits | Real estate	'
Pension Plan and Other Postretirement Benefits Plan	'
Target plan asset allocation	12.00%
Other Benefits | Equity securities	'
Pension Plan and Other Postretirement Benefits Plan	'
Target plan asset allocation	70.00%
Other Benefits | Debt Securities	'
Pension Plan and Other Postretirement Benefits Plan	'
Target plan asset allocation	30.00%

Employee_Pension_and_Other_Pos4

Employee Pension and Other Postretirement Benefits (Details 3) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Pension Benefits	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	$2,747	$2,027	'
Accrued dividends and interest receivable	4	3	'
Net pending trades	-35	-11	'
Total Plan Assets	2,716	2,019	1,757
Pension Benefits | Level 1	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	1,639	1,166	'
Pension Benefits | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	844	687	'
Pension Benefits | Level 3	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	264	174	148
Pension Benefits | Cash and cash equivalents	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	28	42	'
Pension Benefits | Cash and cash equivalents | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	28	42	'
Pension Benefits | U.S. Government securities	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	230	214	'
Pension Benefits | U.S. Government securities | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	230	214	'
Pension Benefits | Corporate bonds	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	364	243	'
Pension Benefits | Corporate bonds | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	364	243	'
Pension Benefits | Equity securities	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	233	158	'
Pension Benefits | Equity securities | Level 1	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	233	158	'
Pension Benefits | Real estate funds	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	242	156	'
Pension Benefits | Real estate funds | Level 3	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	242	156	136
Pension Benefits | Limited partnership	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	156	132	'
Pension Benefits | Limited partnership | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	134	114	'
Pension Benefits | Limited partnership | Level 3	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	22	18	12
Pension Benefits | Common collective funds	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	60	58	'
Pension Benefits | Common collective funds | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	60	58	'
Pension Benefits | Mutual funds	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	1,407	1,008	'
Pension Benefits | Mutual funds | Level 1	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	1,407	1,008	'
Pension Benefits | Other	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	27	16	'
Pension Benefits | Other | Level 1	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	-1	'	'
Pension Benefits | Other | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	28	16	'
Other Benefits	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	251	216	'
Net pending trades	-6	-6	'
Total Plan Assets	245	210	172
Other Benefits | Level 1	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	133	109	'
Other Benefits | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	118	107	'
Other Benefits | Cash and cash equivalents	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	2	9	'
Other Benefits | Cash and cash equivalents | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	2	9	'
Other Benefits | U.S. Government securities	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	33	24	'
Other Benefits | U.S. Government securities | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	33	24	'
Other Benefits | Corporate bonds	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	19	17	'
Other Benefits | Corporate bonds | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	19	17	'
Other Benefits | State and municipal	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	1	1	'
Other Benefits | State and municipal | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	1	1	'
Other Benefits | Mutual funds	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	133	109	'
Other Benefits | Mutual funds | Level 1	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	133	109	'
Other Benefits | Other	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	'	16	'
Other Benefits | Other | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	'	16	'
Other Benefits | Pooled separate accounts	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	63	40	'
Other Benefits | Pooled separate accounts | Level 2	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Total Plan Investments	$63	$40	'

Employee_Pension_and_Other_Pos5

Employee Pension and Other Postretirement Benefits (Details 4) (Pension Benefits, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Plan and Other Postretirement Benefits Plan	'	'
Fair value of plan assets, end of year	$2,747	$2,027
Level 3	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Fair value of plan assets, beginning of year	174	148
Unrealized gains (losses)	18	8
Purchases, issuances, sales, and settlements, net	72	18
Fair value of plan assets, end of year	264	174
Real estate funds	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Fair value of plan assets, end of year	242	156
Real estate funds | Level 3	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Fair value of plan assets, beginning of year	156	136
Unrealized gains (losses)	18	7
Purchases, issuances, sales, and settlements, net	68	13
Fair value of plan assets, end of year	242	156
Limited partnership	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Fair value of plan assets, end of year	156	132
Limited partnership | Level 3	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Fair value of plan assets, beginning of year	18	12
Unrealized gains (losses)	'	1
Purchases, issuances, sales, and settlements, net	4	5
Fair value of plan assets, end of year	$22	$18

Employee_Pension_and_Other_Pos6

Employee Pension and Other Postretirement Benefits (Details 5) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Accumulated benefit obligation	$2,046	$2,161	'
Benefit obligation, beginning of year	2,394	2,135	'
Service cost	87	77	58
Interest cost	99	101	98
Actuarial loss	-243	223	'
Benefits paid	-74	-142	'
Benefit obligation, end of year	2,263	2,394	2,135
Fair value of plan assets, end of year	2,716	2,019	1,757
Over (Under) funded status	453	-375	'
Other Benefits	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Benefit obligation, beginning of year	293	270	'
Service cost	14	14	11
Interest cost	11	12	13
Plan participants' contributions	7	6	'
Actuarial loss	-34	9	'
Medicare Part D employer subsidy	'	2	'
Benefits paid	-21	-20	'
Benefit obligation, end of year	270	293	270
Fair value of plan assets, end of year	245	210	172
Over (Under) funded status	($25)	($83)	'

Employee_Pension_and_Other_Pos7

Employee Pension and Other Postretirement Benefits (Details 6) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Transition Assets, Recognized in net income during the year	'	($1)	($1)
Net Actuarial (Gain) Loss, Arising during the year	116	99	51
Pension Benefits	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Net Actuarial (Gain) Loss, Balance	1,042	1,016	595
Net Actuarial (Gain) Loss, Arising during the year	-468	115	465
Net Actuarial (Gain) Loss, Recognized in net income during the year	-107	-89	-44
Net Actuarial (Gain) Loss, Balance	467	1,042	1,016
Other Benefits	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Transition Assets, Balance	'	1	3
Transition Assets, Recognized in net income during the year	'	-1	-2
Transition Assets, Balance	'	'	1
Net Actuarial (Gain) Loss, Balance	80	90	78
Net Actuarial (Gain) Loss, Arising during the year	-56	-2	18
Net Actuarial (Gain) Loss, Recognized in net income during the year	-7	-8	-6
Net Actuarial (Gain) Loss, Balance	$17	$80	$90

Employee_Pension_and_Other_Pos8

Employee Pension and Other Postretirement Benefits (Details 7) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits	'	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'	'
Net actuarial loss, Gross	$467	$1,042	$1,016	$595
Pension and other benefits adjustment, Gross	467	1,042	'	'
Net actuarial loss in AOCI, Tax	184	410	'	'
Pension and other benefits adjustment, Tax	184	410	'	'
Net Actuarial (Gain)/Loss, Net of Tax	283	632	'	'
Amounts to be reclassified from accumulated other comprehensive loss	283	632	'	'
Expected cash contribution to Pension Plan in 2014	100	'	'	'
Other Benefits	'	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'	'
Net actuarial loss, Gross	17	80	90	78
Pension and other benefits adjustment, Gross	17	80	'	'
Net actuarial loss in AOCI, Tax	7	32	'	'
Pension and other benefits adjustment, Tax	7	32	'	'
Net Actuarial (Gain)/Loss, Net of Tax	10	48	'	'
Amounts to be reclassified from accumulated other comprehensive loss	10	48	'	'
Executive Supplemental Benefits Pension Plan	'	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'	'
Net actuarial loss, Gross	26	29	'	'
Pension and other benefits adjustment, Gross	26	29	'	'
Net actuarial loss in AOCI, Tax	10	11	'	'
Pension and other benefits adjustment, Tax	10	11	'	'
Net Actuarial (Gain)/Loss, Net of Tax	16	18	'	'
Amounts to be reclassified from accumulated other comprehensive loss	16	18	'	'
Pension and Executive Supplemental Benefits	'	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'	'
Pension and other benefits adjustment, Gross	493	1,071	'	'
Pension and other benefits adjustment, Tax	194	421	'	'
Amounts to be reclassified from accumulated other comprehensive loss	$299	$650	'	'

Employee_Pension_and_Other_Pos9

Employee Pension and Other Postretirement Benefits (Details 8) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Pension Benefits	'
Pension Plan and Other Postretirement Benefits Plan	'
2014	$82
2015	89
2016	97
2017	105
2018	113
Years 2019-2023	682
Postretirement Benefits	'
Pension Plan and Other Postretirement Benefits Plan	'
2014	15
2015	16
2016	16
2017	18
2018	18
Years 2019-2023	103
Medicare Part D Subsidies	'
Pension Plan and Other Postretirement Benefits Plan	'
2014	1
2015	1
2016	1
2017	1
2018	1
Years 2019-2023	$6

Recovered_Sheet9

Employee Pension and Other Postretirement Benefits (Details 9) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Discount rate in determining net periodic benefit cost	4.20%	4.70%	'
Discount rate in determining benefit obligations at year end	4.90%	4.20%	'
Rate of increase in future compensation levels for determining net periodic benefit cost	4.70%	4.70%	'
Rate of increase in future compensation levels for determining benefit obligations at year end	4.70%	4.70%	'
Expected return on plan assets	7.50%	7.50%	'
Service cost	$87	$77	$58
Interest cost	99	101	98
Expected return on plan assets	-166	-147	-147
Recognized net actuarial loss	107	89	44
Total net periodic benefit cost	127	120	53
Other Benefits	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Discount rate in determining net periodic benefit cost	3.90%	4.50%	'
Discount rate in determining benefit obligations at year end	4.60%	3.90%	'
Expected return on plan assets	7.50%	7.50%	'
Service cost	14	14	11
Interest cost	11	12	13
Expected return on plan assets	-15	-13	-14
Amortization of transition amount	'	1	2
Recognized net actuarial loss	7	8	6
Total net periodic benefit cost	17	22	18
Superannuation, SERP and ESBP	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Service cost	1	2	1
Interest cost	3	2	4
Recognized net actuarial loss	2	2	1
Total net periodic benefit cost	$6	$6	$6

Recovered_Sheet10

Employee Pension and Other Postretirement Benefits (Details 10) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Net actuarial loss	$55	$109
Amounts to be reclassified from accumulated other comprehensive loss	55	109
Other Benefits	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'
Net actuarial loss	'	6
Amounts to be reclassified from accumulated other comprehensive loss	'	$6

Recovered_Sheet11

Employee Pension and Other Postretirement Benefits (Details 11)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assumed weighted-average healthcare cost trend rates	'	'	'
Healthcare cost trend rate assumed for next year	7.71%	8.31%	8.90%
Rate to which cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%	5.00%
Year the rate reaches the ultimate trend rate	'2021	'2021	'2018

Recovered_Sheet12

Employee Pension and Other Postretirement Benefits (Details 12) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Effect of one-percentage-point change in assumed healthcare cost trend rates	'
Effect on total of service and interest cost components, One-Percentage- Point Decrease	($4)
Effect on postretirement benefit obligation, One-Percentage- Point Decrease	-28
Effect on total of service and interest cost components, One-Percentage- Point Increase	4
Effect on postretirement benefit obligation, One-Percentage- Point Increase	$33

Recovered_Sheet13

Employee Pension and Other Postretirement Benefits (Details 13) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Employee pre-tax covered compensation percent	25.00%	'	'
Employee after-tax covered compensation percent	10.00%	'	'
Combined maximum employee contribution percent	25.00%	'	'
Company pre-tax compensation match (as a percent)	50.00%	'	'
Employee pre-tax gross pay for which the employer contributes a match (as a percent)	6.00%	'	'
Discretionary contribution percent	2.50%	'	'
Contribution plan expenses	$32	$29	$29
Executive Supplemental Benefits Pension Plan	'	'	'
Pension Plan and Other Postretirement Benefits Plan	'	'	'
Accrued liability for ESBPs	$85	$88	'

Other_Noninterest_Income_and_O2

Other Noninterest Income and Other Noninterest Expense (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Noninterest Income and Other Noninterest Expense	'	'	'
Other investment income	$33	$44	$35
All other noninterest income	-24	-28	10
Total other noninterest income	9	16	45
Software	83	70	66
LIHC investment amortization	76	63	69
Advertising and public relations	61	57	45
Communications	45	39	42
Data processing	36	36	39
Other	150	198	147
Total other noninterest expense	$451	$463	$408

Income_Taxes_Details

Income Taxes (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Analysis of the effective tax rate	'	'	'
Federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	5.00%	6.00%	7.00%
Tax-exempt interest income	-1.00%	-1.00%	-1.00%
Tax credits	-13.00%	-10.00%	-10.00%
Change in estimate to the valuation of FDIC covered assets	'	'	-2.00%
Other	-3.00%	-3.00%	'
Effective tax rate	23.00%	27.00%	29.00%

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Taxes currently payable	'	'	'
Federal	$79	$93	$105
State	43	32	67
Foreign	12	14	8
Total currently payable	134	139	180
Taxes deferred	'	'	'
Federal	71	62	101
State	-8	20	28
Foreign	-2	-1	-1
Total deferred	61	81	128
Total income tax expense	$195	$220	$308

Income_Taxes_Details_3

Income Taxes (Details 3) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Deferred tax assets	'	'
Allowance for loan and unfunded credit commitment losses	$287	$338
Accrued expense, net	216	131
Unrealized losses on pension and post retirement benefits	204	456
Unrealized net losses on securities available for sale	262	'
Fair value adjustments for valuation of FDIC covered assets	183	218
Other	97	108
Total gross deferred tax assets	1,249	1,251
Valuation allowance	0	-10
Total deferred tax assets	1,249	1,241
Deferred tax liabilities	'	'
Leasing	698	688
Intangible assets	105	119
Pension liabilities	363	251
Other	17	123
Total deferred tax liabilities	1,183	1,181
Net deferred tax asset	$66	$60

Income_Taxes_Details_4

Income Taxes (Details 4) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Deferred tax assets, carryforwards	'	'
Operating loss carry forward	$69.20	'
Tax credit carry forwards	36.4	'
Net valuation allowance	$0	$10

Income_Taxes_Details_5

Income Taxes (Details 5) (USD $)	0 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Oct. 04, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in unrecognized tax positions	'	'	'	'
Balance, beginning of year	'	$269	$274	$233
Gross increases as a result of tax positions taken during prior periods	'	1	7	53
Gross decreases as a result of tax positions taken during prior periods	'	-256	-13	-13
Gross increases as a result of tax positions taken during current period	'	2	1	1
Balance, end of year	'	16	269	274
Unrecognized tax positions disclosures	'	'	'	'
Unrecognized tax positions that would affect the effective tax rate	'	12	113	115
Interest and penalties recognized (reversed) as a component of income tax expense	'	-12	-14	'
Interest expense recognized in income tax expense	'	'	'	12
Interest and penalties accrued	'	3	15	29
Decrease in unrecognized tax benefits	97	'	'	'
Decrease in unrecognized tax positions from settlements	$159	'	'	'

Regulatory_Capital_Requirement2

Regulatory Capital Requirements (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
UnionBanCal	'	'
Regulatory Capital Requirements	'	'
Tier 1 risk-based capital ratio before application of new methodology	'	12.44%
Total risk-based capital ratio before application of new methodology	'	13.93%
Tier 1 capital (to risk-weighted assets)	$11,471	$9,864
Total capital (to risk-weighted assets), Actual	13,499	11,048
Tier 1 Leverage, Actual	11,471	9,864
Tier 1 capital (to risk-weighted assets), Actual	12.41%	11.91%
Total capital (to risk-weighted assets), Actual	14.61%	13.34%
Tier 1 leverage, Actual	11.27%	11.18%
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purposes	3,696	3,314
Total capital (to risk-weighted assets), For Capital Adequacy Purposes	7,393	6,628
Tier 1 Leverage, For Capital Adequacy Purposes	4,073	3,531
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purpose	4.00%	4.00%
Total capital (to risk-weighted assets), For Capital Adequacy Purpose	8.00%	8.00%
Tier 1 Leverage, Actual	4.00%	4.00%
Bank	'	'
Regulatory Capital Requirements	'	'
Tier 1 capital (to risk-weighted assets)	11,274	9,192
Total capital (to risk-weighted assets), Actual	12,990	10,362
Tier 1 Leverage, Actual	11,274	9,162
Tier 1 capital (to risk-weighted assets), Actual	12.94%	11.68%
Total capital (to risk-weighted assets), Actual	14.91%	13.17%
Tier 1 leverage, Actual	11.13%	10.51%
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purposes	3,485	3,147
Total capital (to risk-weighted assets), For Capital Adequacy Purposes	6,970	6,294
Tier 1 Leverage, For Capital Adequacy Purposes	4,051	3,498
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purpose	4.00%	4.00%
Total capital (to risk-weighted assets), For Capital Adequacy Purpose	8.00%	8.00%
Tier 1 Leverage, Actual	4.00%	4.00%
Tier 1 capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions	5,228	4,720
Total capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions	8,713	7,867
Tier 1 Leverage, To Be Well-Capitalized Under Prompt Corrective Action Provisions	$5,063	$4,373
Tier 1 capital (to risk-weighted assets), To Be Well-Capitalized Under Prompt Corrective Action Provisions	6.00%	6.00%
Total capital, To Be Well-Capitalized Under Prompt Corrective Action Provisions (to risk-weighted assets)	10.00%	10.00%
Tier 1 Leverage, To Be Well-Capitalized Under Prompt Corrective Action Provisions	5.00%	5.00%

Restrictions_on_Cash_and_Due_f1

Restrictions on Cash and Due from Banks, Securities, Loans and Dividends (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
	item
Restrictions on Cash and Due from Banks, Securities, Loans and Dividends	'	'
Required reserve balances	$398,000,000	$412,000,000
Loans pledged as collateral for borrowings	50,200,000,000	43,600,000,000
Federal Reserve Act restricts the amount and the terms of both credit and non-credit transactions, in percentage	10.00%	'
Aggregate of loan to non-bank affiliate	20.00%	'
Outstanding on the number of bankers commercial corporation notes payable	$242,000,000	'
Number of Bankers Commercial Corporation notes payable	24	'

Commitments_Contingencies_and_2

Commitments, Contingencies and Guarantees (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Commitments to extend credit	'
Commitment, Contingencies and Guarantees disclosures	'
Commitments	$33,107
Issued standby and commercial letters of credit	'
Commitment, Contingencies and Guarantees disclosures	'
Commitments	5,881
Maximum term	'1 year
Carrying value	4
Other commitments	'
Commitment, Contingencies and Guarantees disclosures	'
Commitments	$206

Commitments_Contingencies_and_3

Commitments, Contingencies and Guarantees (Details 2) (Financial guarantee, Interest rate swap contracts, USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Financial guarantee | Interest rate swap contracts	'
Guarantee disclosures	'
Current exposure to loss	$13.80
Future exposure to loss	$45.20

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)

12 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Oct. 01, 2011

Sep. 30, 2008

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

BTMU

BTMU

BTMU

BTMU

BTMU

BTMU

Bank

Bank

Bank

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

UnionBanCal Corporation

Union Bank, N.A. and other subsidiaries

Subordinated Debt

Union Bank, N.A. and other subsidiaries

Floating rate subordinated debt due December 2023

Floating rate subordinated debt due December 2023

Floating rate subordinated debt due December 2023

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unsecured revolving credit facility with BTMU

'

'

'

'

$500

'

'

'

'

'

'

'

'

'

'

'

Unsecured revolving credit facility years

'

'

'

'

'3 years

'

'

'

'

'

'

'

'

'

'

'

Unsecured revolving credit facility amount outstanding

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

Risk-weighted assets

'

'

'

'

'

14.61%

14.61%

13.34%

'

14.91%

13.17%

'

'

'

'

'

Project Related expenditure

'

'

'

'

'

'

19

39

42

'

'

'

'

'

'

'

Common equity contribution received

1,200

'

618

'

'

1,200

'

'

'

'

'

'

1,200

'

'

'

Debt issued

6,547

5,622

'

'

'

'

'

'

'

'

'

750

763

869

300

300

Increase in assets

'

'

'

990

'

'

'

'

'

'

'

'

'

'

'

'

Short term borrowing

2,563

1,363

'

38

'

'

'

'

'

'

'

'

'

'

'

'

Capital contribution from BTMU

'

'

'

783

'

'

'

'

'

'

'

'

'

'

'

'

Derivative notional amount

'

'

'

'

'

735

735

415

'

'

'

'

'

'

'

'

Net unrealized losses on derivatives

'

'

'

'

'

'

7

10

'

'

'

'

'

'

'

'

Noninterest income

876

818

827

'

'

'

33

21

18

'

'

'

'

'

'

'

Noninterest expense

2,793

2,566

2,415

'

'

'

13

18

12

'

'

'

'

'

'

'

Reimbursements for facility and staff arrangements

'

'

'

'

'

'

31

'

'

'

'

'

'

'

'

'

Amount of overdraft balance outstanding

'

'

'

'

'

$0

$0

$0

'

'

'

'

'

'

'

'

Business_Segments_Details

Business Segments (Details) (USD $)	12 Months Ended
In Billions, unless otherwise specified	Dec. 31, 2013
	item
Business Segments	'
Reportable business segments	5
Community Banking Division | California	'
Business segments	'
Number of full-service branches	359
Community Banking Division | Washington and Oregon	'
Business segments	'
Number of full-service branches	45
Commercial Banking	'
Business segments	'
Number of divisions	5
Commercial Banking | Maximum	'
Business segments	'
Corporate customers revenues	2
Corporate Banking | Minimum	'
Business segments	'
Corporate customers revenues	2

Business_Segments_Details_2

Business Segments (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business segments	'	'	'
Net interest income (expense)	$2,716	$2,602	$2,441
Noninterest income (expense)	876	818	827
Total revenue	3,592	3,420	3,268
Noninterest expense	2,793	2,566	2,415
(Reversal of) provision for loan losses	-45	25	-202
Income before income taxes and including noncontrolling interests	844	829	1,055
Income tax expense (benefit)	195	220	308
Net Income including Noncontrolling Interests	649	609	747
Deduct: Net loss from noncontrolling interests	18	19	15
Net Income attributable to UnionBanCal Corporation (UNBC)	667	628	762
Total assets, end of period	105,894	97,008	89,696
Reconciling Items	'	'	'
Business segments	'	'	'
Net interest income (expense)	-283	-292	-320
Noninterest income (expense)	-190	-198	-215
Total revenue	-473	-490	-535
Noninterest expense	-127	-131	-139
(Reversal of) provision for loan losses	-4	-3	1
Income before income taxes and including noncontrolling interests	-342	-356	-397
Income tax expense (benefit)	-133	-138	-154
Net Income including Noncontrolling Interests	-209	-218	-243
Net Income attributable to UnionBanCal Corporation (UNBC)	-209	-218	-243
Total assets, end of period	-1,397	-1,104	-774
Retail Banking and Wealth Markets | Operating segments	'	'	'
Business segments	'	'	'
Net interest income (expense)	1,352	1,204	1,202
Noninterest income (expense)	371	336	359
Total revenue	1,723	1,540	1,561
Noninterest expense	1,423	1,294	1,271
(Reversal of) provision for loan losses	-36	55	-82
Income before income taxes and including noncontrolling interests	336	191	372
Income tax expense (benefit)	132	75	146
Net Income including Noncontrolling Interests	204	116	226
Net Income attributable to UnionBanCal Corporation (UNBC)	204	116	226
Total assets, end of period	34,582	31,804	26,956
Commercial Banking | Operating segments	'	'	'
Business segments	'	'	'
Net interest income (expense)	901	753	708
Noninterest income (expense)	196	211	198
Total revenue	1,097	964	906
Noninterest expense	413	393	392
(Reversal of) provision for loan losses	46	-47	-106
Income before income taxes and including noncontrolling interests	638	618	620
Income tax expense (benefit)	155	166	161
Net Income including Noncontrolling Interests	483	452	459
Net Income attributable to UnionBanCal Corporation (UNBC)	483	452	459
Total assets, end of period	32,704	25,450	22,435
Corporate Banking | Operating segments	'	'	'
Business segments	'	'	'
Net interest income (expense)	87	83	77
Noninterest income (expense)	64	64	81
Total revenue	151	147	158
Noninterest expense	48	50	48
(Reversal of) provision for loan losses	1	24	8
Income before income taxes and including noncontrolling interests	102	73	102
Income tax expense (benefit)	40	29	40
Net Income including Noncontrolling Interests	62	44	62
Net Income attributable to UnionBanCal Corporation (UNBC)	62	44	62
Total assets, end of period	3,339	3,025	2,613
Transaction Banking | Operating segments	'	'	'
Business segments	'	'	'
Net interest income (expense)	420	451	468
Noninterest income (expense)	161	167	161
Total revenue	581	618	629
Noninterest expense	362	356	347
(Reversal of) provision for loan losses	-3	-1	-10
Income before income taxes and including noncontrolling interests	222	263	292
Income tax expense (benefit)	88	104	114
Net Income including Noncontrolling Interests	134	159	178
Net Income attributable to UnionBanCal Corporation (UNBC)	134	159	178
Total assets, end of period	1,627	1,631	1,668
Investment Banking & Markets | Operating segments	'	'	'
Business segments	'	'	'
Net interest income (expense)	184	174	131
Noninterest income (expense)	210	207	159
Total revenue	394	381	290
Noninterest expense	100	77	63
(Reversal of) provision for loan losses	6	6	66
Income before income taxes and including noncontrolling interests	288	298	161
Income tax expense (benefit)	78	86	38
Net Income including Noncontrolling Interests	210	212	123
Net Income attributable to UnionBanCal Corporation (UNBC)	210	212	123
Total assets, end of period	5,933	7,137	6,326
Other | Operating segments	'	'	'
Business segments	'	'	'
Net interest income (expense)	55	229	175
Noninterest income (expense)	64	31	84
Total revenue	119	260	259
Noninterest expense	574	527	433
(Reversal of) provision for loan losses	-55	-9	-79
Income before income taxes and including noncontrolling interests	-400	-258	-95
Income tax expense (benefit)	-165	-102	-37
Net Income including Noncontrolling Interests	-235	-156	-58
Deduct: Net loss from noncontrolling interests	18	19	15
Net Income attributable to UnionBanCal Corporation (UNBC)	-217	-137	-43
Total assets, end of period	$29,106	$29,065	$30,472

Condensed_UnionBanCal_Corporat2

Condensed UnionBanCal Corporation Unconsolidated Financial Statements (Parent Company) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Millions, unless otherwise specified
Assets	'	'	'	'
Cash and cash equivalents	$1,863	$1,845	'	'
Other assets	4,854	4,821	'	'
Total assets	105,894	97,008	89,696	'
Liabilities and Stockholder's Equity	'	'	'	'
Other liabilities	1,675	2,099	'	'
Total liabilities	91,426	84,283	'	'
Stockholder's equity	14,468	12,725	11,801	10,378
Total liabilities and equity	105,894	97,008	'	'
UnionBanCal Corporation	'	'	'	'
Assets	'	'	'	'
Cash and cash equivalents	191	763	'	'
Investment in subsidiaries	14,784	12,544	'	'
Other assets	5	24	'	'
Total assets	14,980	13,331	'	'
Liabilities and Stockholder's Equity	'	'	'	'
Long-term debt	763	869	'	'
Other liabilities	2	1	'	'
Total liabilities	765	870	'	'
Stockholder's equity	14,215	12,461	'	'
Total liabilities and equity	$14,980	$13,331	'	'

Condensed_UnionBanCal_Corporat3

Condensed UnionBanCal Corporation Unconsolidated Financial Statements (Parent Company) (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Expense:	'	'	'
Interest expense	$248	$214	$204
Total interest expense	407	370	359
Income tax expense (benefit)	195	220	308
Equity in undistributed net income (loss) of subsidiaries:	'	'	'
Net Income attributable to UnionBanCal Corporation (UNBC)	667	628	762
UnionBanCal Corporation	'	'	'
Income:	'	'	'
Dividends from bank subsidiary	'	950	'
Interest income on advances to subsidiaries and deposits in bank	'	1	1
Total income	'	951	1
Expense:	'	'	'
Interest expense	31	23	13
Other expense	4	'	18
Total interest expense	35	23	31
Income (loss) before income taxes and equity in undistributed net income of subsidiaries	-35	928	-30
Income tax expense (benefit)	-14	-9	-10
Income (loss) before equity in undistributed net income of subsidiaries	-21	937	-20
Equity in undistributed net income (loss) of subsidiaries:	'	'	'
Bank subsidiary	625	-403	783
Nonbank subsidiary	63	94	-1
Net Income attributable to UnionBanCal Corporation (UNBC)	$667	$628	$762

Condensed_UnionBanCal_Corporat4

Condensed UnionBanCal Corporation Unconsolidated Financial Statements (Parent Company) (Details 3) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities:	'	'	'
Net income	$667	$628	$762
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'
Other, net	-37	-70	31
Cash Flows from Investing Activities:	'	'	'
Net cash acquired from (paid for) acquisitions	-3,185	53	-10
Cash Flows from Financing Activities:	'	'	'
Capital contribution from The Bank of Tokyo-Mitsubushi UFJ, Ltd.	1,200	'	618
Proceeds from issuance of subordinated loan due to BTMU	1,050	'	'
Other, net	-25	1	-2
Net increase (decrease) in cash and cash equivalents	712	1,296	3,021
Cash and cash equivalents at beginning of period	5,491	4,195	1,174
Cash and cash equivalents at end of period	6,203	5,491	4,195
UnionBanCal Corporation	'	'	'
Cash Flows from Operating Activities:	'	'	'
Net income	667	628	762
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'
Equity in undistributed net (income) loss of subsidiaries	-688	309	-782
Other, net	14	-14	-3
Net cash provided by (used in) operating activities	-7	923	-23
Cash Flows from Investing Activities:	'	'	'
Investments in and advances to subsidiaries	-1,700	'	-23
Repayment of investments in and advances to subsidiaries	35	650	20
Net cash acquired from (paid for) acquisitions	'	-1,457	'
Net cash used in investing activities	-1,665	-807	-3
Cash Flows from Financing Activities:	'	'	'
Capital contribution from The Bank of Tokyo-Mitsubushi UFJ, Ltd.	1,200	'	'
Proceeds from issuance of subordinated loan due to BTMU	300	'	'
Proceeds from issuance of senior debt	'	397	'
Repayment of subordinated debt	-400	'	'
Repayment of junior subordinated debt	'	'	-14
Other, net	'	-2	'
Net cash provided by (used in) financing activities	1,100	395	-14
Net increase (decrease) in cash and cash equivalents	-572	511	-40
Cash and cash equivalents at beginning of period	763	252	292
Cash and cash equivalents at end of period	$191	$763	$252