10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)
[X]	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended September 30, 2018
OR
[ ]	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from                        to

Commission File Number: 1-15081

MUFG Americas Holdings Corporation

(Exact name of registrant as specified in its charter)

Delaware	94-1234979
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1251 Avenue of the Americas, New York, NY	10020
(Address of principal executive offices)	(Zip Code)
(Registrant's telephone number, including area code) (212) 782-6800

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

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

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

Large accelerated filer o	Accelerated filer o
Non-accelerated filer x (Do not check if a smaller reporting company)	Smaller reporting company o
Emerging growth company o

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

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

Number of shares of Common Stock outstanding at October 31, 2018: 147,589,713

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

MUFG Americas Holdings Corporation and Subsidiaries

Table of Contents

PART I. FINANCIAL INFORMATION	40
Item 1. Financial Statements	40
Consolidated Statements of Income (Unaudited)	40
Consolidated Statements of Comprehensive Income (Unaudited)	41
Consolidated Balance Sheets (Unaudited)	42
Consolidated Statements of Changes in Stockholders' Equity (Unaudited)	43
Consolidated Statements of Cash Flows (Unaudited)	44
Note 1—Summary of Significant Accounting Policies and Nature of Operations	45
Note 2—Securities	49
Note 3—Loans and Allowance for Loan Losses	55
Note 4—Variable Interest Entities	65
Note 5—Securities Financing Arrangements	67
Note 6—Commercial Paper and Other Short-Term Borrowings	69
Note 7—Long-Term Debt	70
Note 8—Fair Value Measurement and Fair Value of Financial Instruments	71
Note 9—Derivative Instruments and Other Financial Instruments Used For Hedging	78
Note 10—Accumulated Other Comprehensive Income	81
Note 11—Employee Pension and Other Postretirement Benefits	84
Note 12—Commitments, Contingencies and Guarantees	85
Note 13—Business Segments	86
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	7
Consolidated Financial Highlights	7
Introduction	10
Executive Overview	10
Financial Performance	12
Balance Sheet Analysis	16
Capital Management	17
Risk Management	21
Business Segments	31
Critical Accounting Estimates	37
Non-GAAP Financial Measures	37
Item 3. Quantitative and Qualitative Disclosures About Market Risk	38
Item 4. Controls and Procedures	39
PART II. OTHER INFORMATION	90
Item 1. Legal Proceedings	90
Item 1A. Risk Factors	90
Item 6. Exhibits	94
SIGNATURES	95

2

Glossary of Defined Terms

The following acronyms and abbreviations are used throughout this Form 10-Q, particularly in Part I, Item 1. “Financial Statements," Item 2. “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” Item 3. “Quantitative and Qualitative Disclosures About Market Risk” and Part II, Item 1A. “Risk Factors.”

Agency Securities	Securities guaranteed by a U.S. government agency
ALCO	Asset Liability Management Committee
ALM	Asset Liability Management
AOCI	Accumulated other comprehensive income
ARC	Americas Risk Committee
ASU	Accounting Standards Update
BCBS	Basel Committee on Banking Supervision
BHC	U.S. Bank Holding Company
CCAR	Comprehensive Capital Analysis and Review
CCPA	California Consumer Privacy Act of 2018
CD	Certificate of deposit
CFPB	Consumer Financial Protection Bureau
CLO	Collateralized loan obligation
CMBS	Commercial mortgage-backed security
Dodd-Frank Act	Dodd-Frank Wall Street Reform and Consumer Protection Act
EGRRCPA	Economic Growth, Regulatory Relief and Consumer Protection Act
ESBP	Executive Supplemental Benefit Plan
EURIBOR	Euro Interbank Offered Rate
Exchange Act	U.S. Securities Exchange Act of 1934
FASB	Financial Accounting Standards Board
FBO	Foreign banking organization
FDIC	Federal Deposit Insurance Corporation
Federal Reserve	Board of Governors of the Federal Reserve System
FHLB	Federal Home Loan Bank
FICO	Fair Isaac Corporation
GAAP	Accounting principles generally accepted in the United States of America
GLBA	Gramm-Leach-Bliley Act
GSE	Government-sponsored enterprise
GSIB	Global systemically important bank
IHC	Intermediate Holding Company
LIHC	Low income housing tax credit
LTV	Loan-to-value
MBS	Mortgage-backed securities
MRM	Market Risk Management
MRMC	Market Risk Management Committee
MUAH	MUFG Americas Holdings Corporation
MUB	MUFG Union Bank, N.A.
MUFG	Mitsubishi UFJ Financial Group, Inc.
MUSA	MUFG Securities Americas Inc.
nm	Not meaningful
OCI	Other comprehensive income
OREO	Other real estate owned
RMBS	Residential mortgage-backed security
SEC	Securities and Exchange Commission
SERP	Supplemental Executive Retirement Plan
SLR	Supplementary leverage ratio
TCJA	Tax Cuts and Jobs Act
TDR	Troubled debt restructuring
TLAC	Total Loss Absorbing Capacity
VaR	Value-at-risk
VIE	Variable interest entity

3

NOTE REGARDING FORWARD-LOOKING STATEMENTS

This report includes forward-looking statements, which include expectations for our operations and business and our assumptions for those expectations. Do not rely unduly on forward-looking statements. Actual results might differ significantly compared to our expectations. See Part I, Item 1A. “Risk Factors,” in our 2017 Form 10-K, Part II, Item 1A. “Risk Factors” in this Form 10-Q, and the other risks described in this Form 10-Q and in our 2017 Form 10-K, for factors to be considered when reading any forward-looking statements in this filing.

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

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

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

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

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

• The economic outlook for the U.S. in general, West Coast states and global economies

• The impact of changes in interest rates resulting from changes in Federal Reserve policy or for other reasons, our strategy to manage our interest rate risk profile and other market risks, our outlook for short-term and long-term interest rates and their effect on our net interest margin, our investment portfolio, our balance sheet composition, and our borrowers’ ability to service their loans and on residential mortgage loans and refinancings

• Pending and recent legislative and regulatory actions, and future legislative and regulatory developments, including the effects of legislation and other governmental measures, including the monetary policies of the Federal Reserve introduced in response to the financial crisis, and the ensuing recession affecting the banking system, financial markets and the U.S. economy, the Dodd-Frank Act, the EGRRCPA, changes to the deposit insurance assessment policies of the FDIC, the effect on and application of foreign and other laws and regulations to our business and operations, and anticipated fees, costs or other impacts on our business and operations as a result of these developments

• Our strategies and expectations regarding capital levels and liquidity, our funding base, deposits, long-term debt, issuance of additional notes under the bank's unsecured bank note program, our expectations regarding the capital, liquidity and enhanced prudential standards adopted by the U.S. bank regulators as a result of or under the Dodd-Frank Act and the BCBS capital and liquidity standards including the Federal banking agencies' TLAC regulation (and our expectation that we will restructure existing debt issued to our parent and replace a portion of our externally-placed debt with debt issued to our parent to comply with this regulation), and other recently adopted and proposed regulations by the U.S. federal banking agencies, and the effect of the foregoing on our business and expectations regarding compliance

4

• Regulatory and compliance controls and processes and their impact on our business, including our operating costs and revenues

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

• Our allowance for credit losses, including the conditions we consider in determining the unallocated allowance and our portfolio credit quality, probability of default and credit migration trends, and severity of loss upon default

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

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

• Our hedging strategies, positions, expectations regarding reclassifications of gains or losses on hedging instruments into earnings; and the sensitivity of our net income to various factors, including customer behavior relating to mortgage prepayments and deposit repricing

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

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

• Critical accounting policies and estimates, the impact or anticipated impact of recent accounting pronouncements, guidance or changes in accounting principles and future recognition of impairments for the fair value of assets, including goodwill, financial instruments, intangible assets and other assets

• Decisions to downsize, sell or close units, dissolve subsidiaries, expand our branch network, pursue acquisitions, purchase banking facilities and equipment, realign our business model or otherwise restructure, reorganize or change our business mix, or the transfer to MUAH by MUFG of its interests in U.S. subsidiaries, and their timing and impact on our business

• Our expectations regarding the formation of our IHC and the impact of acquisitions on our business and results of operations

• The impact of changes in our credit ratings including methodology changes adopted by rating agencies

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

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

• Threats to the banking sector and our business due to cyber-security issues and attacks on financial institutions and other businesses, such as large retailers, and regulatory expectations relating to cyber-security

• Our understanding that MUFG Bank, Ltd. will continue to limit its participation in transactions with Iranian entities and individuals to certain types of transactions

• The objectives and effects on operations of our business integration initiative and its near term effect on our balance sheet, earnings and capital ratios

• The effect of a possible return of the California drought on its economy and related governmental actions and the potential consequences of recent California wildfires or other natural disasters

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

5

Readers of this document should not rely unduly on any forward-looking statements, which reflect only our management’s belief as of the date of this report. There are numerous risks and uncertainties that could cause actual outcomes and results to differ materially from those discussed in our forward-looking statements. Many of these factors are beyond our ability to control or predict and could have a material adverse effect on our financial condition, results of operations or prospects. Such risks and uncertainties include, but are not limited to, those described or referred to in Part I, Item 1. “Business” under the captions “Competition” and “Supervision and Regulation” in our 2017 Form 10-K, and in Part II, Item 1A. “Risk Factors” and Part I, Item 2. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this Form 10-Q, and in our other reports to the SEC.

Any factor described in this report or in our other reports could by itself, or together with one or more other factors, adversely affect our business, prospects, results of operations or financial condition.

6

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

MUFG Americas Holdings Corporation and Subsidiaries

Consolidated Financial Highlights

	For the Three Months Ended								For the Nine Months Ended
(Dollars in millions)	September 30, 2018			September 30, 2017			Percent Change		September 30, 2018			September 30, 2017			Percent Change
Results of operations:
Net interest income	$	832		$	816		2	%	$	2,482		$	2,405		3	%
Noninterest income	626			515			22		1,604			1,492			8
Total revenue	1,458			1,331			10		4,086			3,897			5
Noninterest expense	1,059			982			8		3,226			2,945			10
Pre-tax, pre-provision income(1)	399			349			14		860			952			(10	)
(Reversal of) provision for credit losses	64			18			256		43			(34		)	226
Income before income taxes and including noncontrolling interests	335			331			1		817			986			(17	)
Income tax expense (benefit)	35			109			(68	)	21			255			(92	)
Net income including noncontrolling interests	300			222			35		796			731			9
Deduct: Net loss from noncontrolling interests	6			10			(40	)	20			25			(20	)
Net income attributable to MUAH	$	306		$	232		32		$	816		$	756		8
Balance sheet (period average):
Total assets	$	160,811		$	152,695		5	%	$	159,209		$	150,613		6	%
Total securities	27,078			27,104			—		27,216			25,799			5
Securities borrowed or purchased under resale agreements	20,316			20,614			(1	)	20,402			20,565			(1	)
Total loans held for investment	83,164			79,047			5		81,955			78,514			4
Earning assets	147,432			138,995			6		145,734			137,429			6
Total deposits	86,783			85,263			2		84,933			85,723			(1	)
Securities loaned or sold under repurchase agreements	26,679			26,183			2		26,898			25,926			4
MUAH stockholders' equity	18,682			18,485			1		18,376			17,827			3
Performance ratios:
Return on average assets(2)	0.76		%	0.61		%			0.68		%	0.67		%
Return on average MUAH stockholders' equity(2)	6.55			5.02					5.92			5.64
Return on average MUAH tangible common equity(2)(3)	8.22			6.35					7.47			7.10
Efficiency ratio(4)	72.59			73.78					78.93			75.57
Net interest margin(2)(5)	2.27			2.37					2.30			2.36
Net loans charged-off to average total loans held for investment(2)	0.03			0.03					0.03			0.17

7

MUFG Americas Holdings Corporation and Subsidiaries

Consolidated Financial Highlights (Continued)

	As of
	September 30, 2018			December 31, 2017			Percent Change
Balance sheet (end of period):
Total assets	$	161,036		$	154,550		4	%
Total securities	28,397			27,448			3
Securities borrowed or purchased under resale agreements	21,265			20,894			2
Total loans held for investment	83,653			80,014			5
Nonperforming assets	411			466			(12	)
Total deposits	87,811			84,787			4
Securities loaned or sold under repurchase agreements	27,032			26,437			2
Long-term debt	12,796			12,162			5
MUAH stockholders' equity	18,742			18,255			3
Credit ratios:
Allowance for loan losses to total loans held for investment(6)	0.60		%	0.59		%
Allowance for loan losses to nonaccrual loans(6)	122.04			102.37
Allowance for credit losses to total loans held for investment(7)	0.74			0.75
Allowance for credit losses to nonaccrual loans(7)	151.64			128.75
Nonperforming assets to total loans held for investment and OREO	0.49			0.58
Nonperforming assets to total assets	0.26			0.30
Nonaccrual loans to total loans held for investment	0.49			0.58
Capital ratios:
Regulatory(8):
Common Equity Tier 1 risk-based capital ratio	16.58		%	16.31		%
Tier 1 risk-based capital ratio	16.58			16.31
Total risk-based capital ratio	17.54			17.76
Tier 1 leverage ratio	10.38			10.06
Other:
Tangible common equity ratio(9)	9.65		%	9.73		%
Common Equity Tier 1 risk-based capital ratio (U.S. Basel III standardized   approach; fully phased-in)(10)	16.58			16.27

8

MUFG Americas Holdings Corporation and Subsidiaries

Consolidated Financial Highlights (Continued)

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

(2) Annualized.

(3) Return on tangible common equity, a non-GAAP financial measure, is net income excluding intangible asset amortization divided by average tangible common equity. Management believes that this ratio provides useful supplemental information regarding the Company's business results. The methodology for determining tangible common equity may differ among companies. See "Non-GAAP Financial Measures" in Part I, Item 2. "Management's Discussion and Analysis of Financial Condition and Results of Operations" in this Form 10-Q for additional information.

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

(5) Yields, interest income and net interest margin are presented on a taxable-equivalent basis using the federal statutory tax rates of 21% and 35% for 2018 and 2017, respectively.

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

(7) The allowance for credit losses ratios include the allowances for loan losses and for losses on unfunded credit commitments as a percentage of end of period total loans held for investment or total nonaccrual loans, as appropriate.

(8) These capital ratios are calculated in accordance with the transition guidelines set forth in the U.S. federal banking agencies' final U.S. Basel III regulatory capital rules.

(9) The tangible common equity ratio, a non-GAAP financial measure, is calculated as tangible common equity divided by tangible assets. The methodology for determining tangible common equity may differ among companies. The tangible common equity ratio facilitates the understanding of the Company's capital structure and is used to assess and compare the quality and composition of the Company's capital structure to other financial institutions. See "Capital Management" in Part I, Item 2. "Management's Discussion and Analysis of Financial Condition and Results of Operations" in this Form 10-Q for additional information.

(10) Common Equity Tier 1 risk-based capital (standardized, fully phased-in basis) is a non-GAAP financial measure that is used by investors, analysts and bank regulatory agencies to assess the capital position of financial services companies as if the transition provisions of the U.S. Basel III rules were fully phased in for the periods in which the ratio is disclosed.  Management reviews this ratio, which excludes components of accumulated other comprehensive loss, along with other measures of capital as part of its financial analyses and has included this non-GAAP information because of current interest in such information by market participants. See "Capital Management" in Part I, Item 2. "Management's Discussion and Analysis of Financial Condition and Results of Operations" in this Form 10-Q for additional information.

9

Please refer to our Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 (2017 Form 10-K) along with the following discussion and analysis of our consolidated financial position and results of operations for the period ended September 30, 2018 in this Form 10-Q. Averages, as presented in the following tables, are substantially all based upon daily average balances.

As used in this Form 10-Q, terms such as the "Company,” “we,” “us” and “our” refer to MUFG Americas Holdings Corporation (MUAH), one or more of its consolidated subsidiaries, or to all of them together.

Introduction

We are a financial holding company, bank holding company and intermediate holding company whose principal subsidiaries are MUFG Union Bank, N.A. (MUB or the Bank) and MUSA. We are owned by MUFG Bank, Ltd. (formerly The Bank of Tokyo-Mitsubishi UFJ, Ltd.) and MUFG. MUFG Bank, Ltd. is a wholly-owned subsidiary of MUFG.

The Company has four reportable segments: Regional Bank, U.S. Wholesale & Investment Banking, Transaction Banking and MUSA. We service U.S. Wholesale & Investment Banking, certain Transaction Banking, and MUSA customers through the MUFG brand and serve Regional Bank and Transaction Banking customers through the Union Bank brand. We provide a wide range of financial services to consumers, small businesses, middle-market companies and major corporations, both nationally and internationally.

The Company also provides various business, banking, financial, administrative and support services, and facilities for MUFG Bank, Ltd. in connection with the operation and administration of MUFG Bank, Ltd.'s business in the U.S. (including MUFG Bank, Ltd.'s U.S. branches). The Bank and MUFG Bank, Ltd. are parties to a master services agreement whereby the Bank earns fee income in exchange for services and facilities provided.

The Company’s leadership team is bicoastal with Regional Bank and Transaction Banking leaders on the West Coast while U.S. Wholesale & Investment Banking and MUSA leaders are based in New York City. The corporate headquarters (principal executive office) for MUB, MUSA and MUAH is in New York City. MUB's main banking office is in San Francisco. The Company had consolidated assets of $161.0 billion at September 30, 2018.

Executive Overview

We are providing you with an overview of what we believe are the most significant factors and developments that affected our third quarter 2018 results and that could influence our future results. Further detailed information can be found elsewhere in this Form 10-Q. In addition, you should carefully read this entire document and any other reports that we refer to in this Form 10-Q for more detailed information to assist your understanding of trends, events and uncertainties that impact us.

Our sources of revenue are net interest income and noninterest income (collectively “total revenue”). Net interest income is generated predominantly from interest earned from loans, investment securities, securities borrowed or purchased under resale agreements, trading account assets and other interest-earning assets, less interest incurred on deposits and borrowings, securities loaned or sold under repurchase agreements and other interest-bearing liabilities. The primary sources of noninterest income are revenues from investment banking and syndication fees, service charges on deposit accounts, trust and investment management fees, trading account activities, credit facility fees, and fees from affiliates. Changes in interest rates, credit quality, economic trends and the capital markets are primary factors that affect our revenue sources. In the third quarter of 2018, revenue was comprised of 57% net interest income and 43% noninterest income. A summary of our financial results is discussed below.

Our primary sources of liquidity are core deposits, securities and wholesale funding. Core deposits exclude brokered deposits, foreign time deposits, domestic time deposits greater than $250,000, and certain other deposits not considered to be core customer relationships. Wholesale funding includes unsecured funds raised from MUFG Bank, Ltd. and affiliates, interbank and other sources, both domestic and international, funding secured by certain assets, or by borrowing from the FHLB. We evaluate and monitor the stability and reliability of our various funding sources to help ensure that we have sufficient liquidity when adverse situations arise.

10

Performance Highlights

Net income attributable to MUAH was $306 million and $816 million for the three and nine months endedSeptember 30, 2018, respectively. Net income attributable to MUAH increased$74 million and $60 million, respectively, compared with the same periods in 2017, primarily due to higher net interest income from an increase in earning assets, higher fees from affiliates, and lower tax expense as a result of the TCJA. These increases in net income were partially offset by higher salaries and benefits expense. Net income for the nine months endedSeptember 30, 2018 was also reduced by losses on certain renewable energy investments in the first quarter of 2018 as a result of the TCJA.

The provision for credit losses was $43 million for the nine months endedSeptember 30, 2018, compared with a reversal of $34 million for the nine months endedSeptember 30, 2017. The provision for credit losses in 2018 was primarily due to the impact of specific reserves for credit losses on impaired loans during the third quarter of 2018. The reversal of provision for credit losses in 2017 reflected general improvement in portfolio credit quality and composition.

Capital Ratios

The Company's capital ratios continued to exceed all well-capitalized and minimum regulatory thresholds for BHCs, as applicable. The U.S. Basel III Common Equity Tier 1, Tier 1 and Total risk-based capital ratios were 16.58%, 16.58% and 17.54%, respectively, at September 30, 2018. The Tier 1 leverage ratio was 10.38% at September 30, 2018.

11

Financial Performance

Net Interest Income

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

	For the Three Months Ended
	September 30, 2018							September 30, 2017
	Average Balance			Interest Income/ Expense(1)		Average Yield/ Rate(1)(2)		Average Balance			Interest Income/ Expense(1)		Average Yield/ Rate(1)(2)
(Dollars in millions)
Assets
Loans held for investment:(3)
Commercial and industrial	$	23,517		$	259	4.35	%	$	24,619		$	229	3.68	%
Commercial mortgage	14,817			154		4.17		14,126			144		4.10
Construction	1,513			20		5.23		1,859			21		4.58
Lease financing	1,433			15		4.32		1,838			17		3.69
Residential mortgage	37,813			334		3.53		33,254			282		3.38
Home equity and other consumer loans	4,071			65		6.36		3,351			50		5.91
Total loans held for investment	83,164			847		4.06		79,047			743		3.75
Securities	27,078			171		2.51		27,104			154		2.28
Securities borrowed or purchased under resale agreements	20,316			171		3.35		20,614			97		1.87
Interest bearing deposits in banks	4,374			24		2.10		2,093			10		1.56
Federal funds sold	—			—		—		2			—		1.76
Trading account assets	12,094			109		3.58		9,802			89		3.62
Other earning assets	406			1		1.32		333			—		1.43
Total earning assets	147,432			1,323		3.57		138,995			1,093		3.13
Allowance for loan losses	(441		)					(517		)
Cash and due from banks	1,774							1,895
Premises and equipment, net	616							609
Other assets(4)	11,430							11,713
Total assets	$	160,811						$	152,695
Liabilities
Interest bearing deposits:
Transaction and money market accounts	$	36,734		$	66	0.72	%	$	38,144		$	37	0.39	%
Savings	9,398			18		0.76		8,255			8		0.38
Time	8,165			40		1.92		5,549			17		1.20
Total interest bearing deposits	54,297			124		0.91		51,948			62		0.48
Commercial paper and other short-term borrowings	8,870			46		2.03		6,328			17		1.08
Securities loaned or sold under repurchase agreements	26,679			193		2.87		26,183			102		1.54
Long-term debt	13,871			92		2.66		10,935			66		2.39
Total borrowed funds	49,420			331		2.66		43,446			185		1.69
Trading account liabilities	3,812			30		3.06		3,157			20		2.53
Total interest bearing liabilities	107,529			485		1.79		98,551			267		1.08
Noninterest bearing deposits	32,486							33,315
Other liabilities(5)	2,030							2,218
Total liabilities	142,045							134,084
Equity
MUAH stockholders' equity	18,682							18,485
Noncontrolling interests	84							126
Total equity	18,766							18,611
Total liabilities and equity	$	160,811						$	152,695
Net interest income/spread (taxable-equivalent basis)				838		1.78	%				826		2.05	%
Impact of noninterest bearing deposits						0.42							0.28
Impact of other noninterest bearing sources						0.07							0.04
Net interest margin						2.27							2.37
Less: taxable-equivalent adjustment				6							10
Net interest income				$	832						$	816

(1) Yields, interest income and net interest margin are presented on a taxable-equivalent basis using the federal statutory tax rates of 21% and 35% for 2018 and 2017, respectively.

(2) Annualized.

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

(4) Other assets include noninterest bearing trading account assets.

(5) Other liabilities include noninterest bearing trading account liabilities.

12

	For the Nine Months Ended
	September 30, 2018							September 30, 2017
	Average Balance			Interest Income/ Expense(1)		Average Yield/ Rate(1)(2)		Average Balance			Interest Income/ Expense(1)		Average Yield/ Rate(1)(2)
(Dollars in millions)
Assets
Loans held for investment:(3)
Commercial and industrial	$	23,504		$	726	4.13	%	$	25,146		$	677	3.60	%
Commercial mortgage	14,552			454		4.16		14,347			437		4.06
Construction	1,680			60		4.79		2,016			64		4.30
Lease financing	1,472			47		4.26		1,795			50		3.70
Residential mortgage	36,998			969		3.49		31,820			807		3.38
Home equity and other consumer loans	3,749			179		6.37		3,390			147		5.81
Total loans held for investment	81,955			2,435		3.97		78,514			2,182		3.71
Securities	27,216			500		2.45		25,799			424		2.19
Securities borrowed or purchased under resale agreements	20,402			454		2.98		20,565			243		1.58
Interest bearing deposits in banks	3,671			53		1.90		2,591			23		1.15
Federal funds sold	7			—		—		2			—		1.58
Trading account assets	12,036			308		3.42		9,496			245		3.45
Other earning assets	447			5		1.62		462			5		1.53
Total earning assets	145,734			3,755		3.44		137,429			3,122		3.03
Allowance for loan losses	(457		)					(578		)
Cash and due from banks	1,809							1,866
Premises and equipment, net	611							603
Other assets(4)	11,512							11,293
Total assets	$	159,209						$	150,613
Liabilities
Interest bearing deposits:
Transaction and money market accounts	$	36,695		$	158	0.58	%	$	38,748		$	106	0.37	%
Savings	8,977			43		0.64		7,427			15		0.27
Time	6,480			77		1.59		5,507			48		1.16
Total interest bearing deposits	52,152			278		0.71		51,682			169		0.44
Commercial paper and other short-term borrowings	8,860			121		1.82		4,514			35		1.04
Securities loaned or sold under repurchase agreements	26,898			509		2.53		25,926			245		1.26
Long-term debt	14,116			266		2.51		11,079			183		2.20
Total borrowed funds	49,874			896		2.40		41,519			463		1.49
Trading account liabilities	3,718			81		2.90		2,885			56		2.58
Total interest-bearing liabilities	105,744			1,255		1.58		96,086			688		0.96
Noninterest bearing deposits	32,781							34,041
Other liabilities(5)	2,214							2,524
Total liabilities	140,739							132,651
Equity
MUAH stockholders' equity	18,376							17,827
Noncontrolling interests	94							135
Total equity	18,470							17,962
Total liabilities and equity	$	159,209						$	150,613
Net interest income/spread (taxable-equivalent basis)				2,500		1.86	%				2,434		2.07	%
Impact of noninterest bearing deposits						0.38							0.25
Impact of other noninterest bearing sources						0.06							0.04
Net interest margin						2.30							2.36
Less: taxable-equivalent adjustment				18							29
Net interest income				$	2,482						$	2,405

(1) Yields, interest income and net interest margin are presented on a taxable-equivalent basis using the federal statutory tax rates of 21% and 35% for 2018 and 2017, respectively.

(2) Annualized.

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

(4) Other assets include noninterest bearing trading account assets.

(5) Other liabilities include noninterest bearing trading account liabilities.

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Net interest income for the three and nine months endedSeptember 30, 2018increased$16 million and $77 million, respectively, compared with the same periods in 2017, due to an increase in earning assets, partially offset by a decline in the net interest margin. Earning assets increased largely due to increases in residential mortgages and trading assets, partially offset by a decrease in commercial and industrial loan balances. The net interest margin decreasedten and six basis points during the three and nine months endedSeptember 30, 2018, respectively, due primarily to an increase in funding costs resulting from an increase in borrowed funds and a flatter yield curve, partially offset by the favorable effect of noninterest bearing deposits in a rising rate environment.

Noninterest Income and Noninterest Expense

The following tables display our noninterest income and noninterest expense for the three and nine months endedSeptember 30, 2018 and 2017.

Noninterest Income

	For the Three Months Ended											For the Nine Months Ended
							Increase (Decrease)											Increase (Decrease)
	September 30, 2018			September 30, 2017								September 30, 2018			September 30, 2017
(Dollars in millions)							Amount			Percent								Amount			Percent
Service charges on deposit accounts	$	44		$	47		$	(3	)	(6	)%	$	134		$	142		$	(8	)	(6	)%
Trust and investment management fees	30			32			(2		)	(6	)	89			91			(2		)	(2	)
Trading account activities	(5		)	(3		)	(2		)	(67	)	(13		)	(10		)	(3		)	(30	)
Securities gains, net	1			6			(5		)	(83	)	4			15			(11		)	(73	)
Credit facility fees	23			26			(3		)	(12	)	69			75			(6		)	(8	)
Brokerage commissions and fees	18			16			2			13		55			52			3			6
Card processing fees, net	12			10			2			20		37			34			3			9
Investment banking and syndication fees	108			106			2			2		285			288			(3		)	(1	)
Fees from affiliates	306			209			97			46		881			639			242			38
Other, net	89			66			23			35		63			166			(103		)	(62	)
Total noninterest income	$	626		$	515		$	111		22		$	1,604		$	1,492		$	112		8

Noninterest income increased during the three and nine months endedSeptember 30, 2018 compared with the prior year periods largely due to an increase in fees from affiliates. During the nine months endedSeptember 30, 2018, noninterest income also increased due to fund administration fees from entities transferred to the Company on July 1, 2017 (included in other, net). These increases were offset by the Company's share of losses on certain renewable energy investments of $164 million recorded in the first quarter of 2018 as a result of the TCJA (included in other, net). The increase in fees from affiliates during 2018 was due to higher fees earned under the master services agreement with MUFG Bank, Ltd. and a change in presentation of certain expenses beginning January 1, 2018, as a result of adopting ASU 2016-08, Principal versus Agent Considerations. During the three and nine months endedSeptember 30, 2018, expenses of $49 million and $127 million, respectively, were presented as noninterest expense, rather than a reduction of fees from affiliates as they were presented through December 31, 2017.

14

Noninterest Expense

	For the Three Months Ended									For the Nine Months Ended
					Increase (Decrease)									Increase (Decrease)
	September 30, 2018		September 30, 2017							September 30, 2018		September 30, 2017
(Dollars in millions)					Amount			Percent						Amount			Percent
Salaries and employee benefits	$	652	$	621	$	31		5	%	$	2,000	$	1,881	$	119		6	%
Net occupancy and equipment	89		87		2			2		264		256		8			3
Professional and outside services	110		101		9			9		356		316		40			13
Software	73		49		24			49		213		142		71			50
Regulatory assessments	24		22		2			9		69		61		8			13
Intangible asset amortization	6		8		(2		)	(25	)	20		22		(2		)	(9	)
Other	105		94		11			12		304		267		37			14
Total noninterest expense	$	1,059	$	982	$	77		8		$	3,226	$	2,945	$	281		10

The increase in noninterest expense for the three and nine months endedSeptember 30, 2018 compared with the prior year periods was driven primarily by the change in presentation of certain expenses and an increase in salaries and employee benefits expense. The increases in professional and outside services and software expenses were largely due to the change in presentation of certain expenses beginning January 1, 2018, as a result of adopting ASU 2016-08, Principal versus Agent Considerations, as discussed in Noninterest Income above. The increase in salaries and employee benefits expense included the impact of higher headcount.

Income Tax Expense

In the third quarter of 2018, income tax expense was $35 million and the effective tax rate was 10%, compared with 33% in the third quarter of 2017. For the nine months ended September 30, 2018, income tax expense was $21 million and the effective tax rate was 3%, compared with 26% in the comparative prior year period.

Income tax expense and the effective tax rate for the three and nine months endedSeptember 30, 2018 were lower than the comparative prior year periods as a result of the TCJA. Income tax expense during the nine months endedSeptember 30, 2018 also included an adjustment to certain prior period state income taxes during the first quarter of 2018. Excluding that adjustment, the effective tax rate for the nine months endedSeptember 30, 2018 would have been 9%.

For additional information regarding income tax expense, see "Income Tax Expense" in Part II, Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations ", “The changes in the U.S. tax laws, the majority of which were effective January 1, 2018, will impact our business and results of operations in a variety of ways, some of which are expected to be positive and others which may be negative” and “Our effective tax rates, and our future results can also be affected by our participation for state income tax purposes as a member of MUFG’s unitary group in the U.S. and by other factors” in Part I, Item 1A. "Risk Factors" and Note 17 "Income Taxes" to our Consolidated Financial Statements in Part II, Item 8. “Financial Statements and Supplementary Data” in our 2017 Form 10-K.

15

Balance Sheet Analysis

Securities

Our securities portfolio is primarily used for liquidity and interest rate risk management purposes, to invest cash resulting from excess liquidity, and to a lesser extent, to support our business development objectives. We strive to maximize total return while managing this objective within appropriate risk parameters. Securities available for sale are principally comprised of U.S. Treasury securities, U.S. government-sponsored agency securities, RMBSs, CMBSs, Cash Flow CLOs, and direct bank purchase bonds. Direct bank purchase bonds are instruments that are issued in bond form, accounted for as securities, but underwritten as loans with features that are typically found in commercial loans. Securities held to maturity consist of U.S. Treasury securities, U.S. government-sponsored agency securities and U.S. government-sponsored agency RMBSs and CMBSs.

The amortized cost, gross unrealized gains, gross unrealized losses and fair values of securities are detailed in Note 2 "Securities" to our Consolidated Financial Statements in Part I, Item 1. "Financial Statements" in this Form 10-Q.

Loans Held for Investment

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

					Increase (Decrease)
	September 30, 2018		December 31, 2017
(Dollars in millions)					Amount			Percent
Loans held for investment:
Commercial and industrial	$	23,349	$	23,281	$	68		—	%
Commercial mortgage	15,031		14,320		711			5
Construction	1,480		1,775		(295		)	(17	)
Lease financing	1,417		1,533		(116		)	(8	)
Total commercial portfolio	41,277		40,909		368			1
Residential mortgage	38,059		35,643		2,416			7
Home equity and other consumer loans	4,317		3,462		855			25
Total consumer portfolio	42,376		39,105		3,271			8
Total loans held for investment	$	83,653	$	80,014	$	3,639		5

Loans held for investment increased from December 31, 2017 to September 30, 2018, primarily due to growth in the residential mortgage portfolio.

Deposits

The table below presents our deposits as of September 30, 2018 and December 31, 2017.

					Increase (Decrease)
	September 30, 2018		December 31, 2017
(Dollars in millions)					Amount			Percent
Interest checking	$	3,710	$	5,209	$	(1,499	)	(29	)%
Money market	32,615		33,245		(630		)	(2	)
Total interest bearing transaction and money market accounts	36,325		38,454		(2,129		)	(6	)
Savings	9,304		8,426		878			10
Time	9,957		5,305		4,652			88
Total interest bearing deposits	55,586		52,185		3,401			7
Noninterest bearing deposits	32,225		32,602		(377		)	(1	)
Total deposits	$	87,811	$	84,787	$	3,024		4

16

Total deposits increased $3.0 billion from December 31, 2017 to September 30, 2018 due to an increase in time deposits, partially offset by a decrease in transaction and money market accounts. The increase in time deposits was primarily related to Consumer Banking and PurePoint Financial, the online division of the Bank. The decrease in transaction and money market accounts was primarily due to a decrease in high rate money market deposits within Consumer Banking.

Securities Financing Arrangements

The Company enters into securities purchased under agreements to resell, securities sold under agreements to repurchase, and securities borrowing and lending transactions to facilitate customer match-book activity, cover short positions and to fund the Company's trading inventory. These balances are almost entirely attributable to MUSA. See Note 5 "Securities Financing Arrangements" to our Consolidated Financial Statements in Part I, Item 1. "Financial Statements" in this Form 10-Q for more information.

Capital Management

Both MUAH and MUB are subject to various capital adequacy regulations issued by the U.S. federal banking agencies, including requirements to file an annual capital plan and to maintain minimum regulatory capital ratios. As of September 30, 2018, management believes the capital ratios of MUAH and MUB met all regulatory requirements of “well-capitalized” institutions. The Company has under consideration a common stock repurchase from its parent companies in the fourth quarter of 2018, subject to the approval of the Company’s board of directors. The Company’s capital ratios will continue to be significantly in excess of the requirements for “well-capitalized” institutions after any such transaction.

The Company timely filed its annual capital plan under the Federal Reserve's CCAR program in April 2018. CCAR evaluates capital planning processes and assesses capital adequacy levels under various scenarios to determine if BHCs would have sufficient capital to continue operations throughout times of economic and financial market stress. The Company's 2018 CCAR submission encompassed a range of expected and stressed economic and financial market scenarios, and included an assessment of expected sources and uses of capital over a prescribed planning horizon, a description of all capital actions within that time frame, and a discussion of any proposed business plan changes that are likely to have a material impact on capital adequacy. In June 2018, the Company received notice that the Federal Reserve did not object to the Company's capital plan. In accordance with regulatory requirements, the Company subsequently disclosed the results of its annual company-run Dodd-Frank Act stress test. In October 2018, the Company submitted its mid-cycle Dodd-Frank Act Stress Test results to the Federal Reserve and subsequently disclosed the results of those stress tests.

MUAH and MUB are required to maintain minimum capital ratios in accordance with rules issued by the U.S. federal banking agencies. In July 2013, the U.S. federal banking agencies issued final rules to implement the BCBS capital guidelines for U.S. banking organizations (U.S. Basel III). These rules supersede the U.S. federal banking agencies’ general risk-based capital rules (commonly known as “Basel I”), advanced approaches rules (commonly known as “Basel II”) that are applicable to certain large banking organizations, and leverage rules, and are subject to certain transition provisions. Among other requirements, the U.S. Basel III rules revised the definition of capital; increased minimum capital ratios; introduced a minimum Common Equity Tier 1 capital ratio of 4.5% and a capital conservation buffer of 2.5% (for a total minimum Common Equity Tier 1 capital ratio of 7.0%) and, for advanced approaches institutions, a potential countercyclical buffer of up to 2.5%, which would be imposed by regulators at their discretion if it is determined that a period of excessive credit growth is contributing to an increase in financial institution systemic risk; mandated a Tier 1 leverage ratio of 4%; introduced, for large and internationally active BHCs, a Tier 1 SLR that is currently set at 3% and which incorporates off-balance sheet exposures; revised Basel I rules for calculating risk-weighted assets under a standardized approach; modified the existing Basel II advanced approaches rules for calculating risk-weighted assets under U.S. Basel III; and phased-out, for advanced approaches institutions, the exclusion of AOCI that had applied under Basel I and Basel II rules, over a four-year transition period beginning on January 1, 2014. Banking organizations not subject to the advanced approaches rules, such as MUAH, were required to comply with the standardized approach capital rules beginning on January 1, 2015.

As required under U.S. Basel III rules, the 2.5% capital conservation buffer is being implemented on a phased-in basis in equal increments of 0.625% per year over a four-year period that commenced on January 1,

17

2016. MUAH and MUB would satisfy the minimum capital requirements including the capital conservation buffer on a fully phased-in basis if those requirements were effective as of September 30, 2018.

The following tables summarize the calculation of MUAH’s risk-based capital ratios in accordance with the U.S. Basel III rules as of September 30, 2018 and December 31, 2017.

MUFG Americas Holdings Corporation

	U.S. Basel III
(Dollars in millions)	September 30, 2018		December 31, 2017
Capital Components
Common Equity Tier 1 capital	$	16,467	$	15,708
Tier 1 capital	$	16,467	$	15,708
Tier 2 capital	958		1,398
Total risk-based capital	$	17,425	$	17,106
Risk-weighted assets	$	99,339	$	96,330
Average total assets for leverage capital purposes	$	158,674	$	156,126

	U.S. Basel III								Minimum Capital Requirement with Capital Conservation Buffer (1)
(Dollars in millions)	September 30, 2018				December 31, 2017				September 30, 2018
Capital Ratios	Amount		Ratio		Amount		Ratio		Amount			Ratio
Common Equity Tier 1 capital (to risk-weighted assets)	$	16,467	16.58	%	$	15,708	16.31	%	≥	$	6,333	6.375	%
Tier 1 capital (to risk-weighted assets)	16,467		16.58		15,708		16.31		≥	7,823		7.875
Total capital (to risk-weighted assets)	17,425		17.54		17,106		17.76		≥	9,810		9.875
Tier 1 leverage(2)	16,467		10.38		15,708		10.06		≥	6,347		4.000

(1)Beginning January 1, 2018, the minimum capital requirement includes a capital conservation buffer of 1.875%.

(2)Tier 1 capital divided by quarterly average assets (excluding certain disallowed assets, primarily goodwill and other intangibles).

18

The following tables summarize the calculation of MUB’s risk-based capital ratios in accordance with the transition guidelines set forth in the U.S. Basel III rules as of September 30, 2018 and December 31, 2017.

MUFG Union Bank, N.A.

	U.S. Basel III
(Dollars in millions)	September 30, 2018		December 31, 2017
Capital Components
Common Equity Tier 1 capital	$	14,750	$	14,028
Tier 1 capital	$	14,750	$	14,028
Tier 2 capital	592		1,307
Total risk-based capital	$	15,342	$	15,335
Risk-weighted assets	$	89,011	$	86,730
Average total assets for leverage capital purposes	$	121,612	$	119,052

	U.S. Basel III								Minimum Capital Requirement with Capital Conservation Buffer (1)					To Be Well-Capitalized under Prompt Corrective Action Provisions
(Dollars in millions)	September 30, 2018				December 31, 2017				September 30, 2018
Capital Ratios	Amount		Ratio		Amount		Ratio		Amount			Ratio		Amount			Ratio
Common Equity Tier 1 capital (to risk-weighted assets)	$	14,750	16.57	%	$	14,028	16.17	%	≥	$	5,674	6.375	%	≥	$	5,786	6.50	%
Tier 1 capital (to risk-weighted assets)	14,750		16.57		14,028		16.17		≥	7,010		7.875		≥	7,121		8.00
Total capital (to risk-weighted assets)	15,342		17.24		15,335		17.68		≥	8,790		9.875		≥	8,901		10.00
Tier 1 leverage(2)	14,750		12.13		14,028		11.78		≥	4,864		4.000		≥	6,081		5.00

(1)Beginning January 1, 2018, the minimum capital requirement includes a capital conservation buffer of 1.875%.

(2)Tier 1 capital divided by quarterly average assets (excluding certain disallowed assets, primarily goodwill and other intangibles).

During the second quarter of 2018, the Company repaid $750 million of subordinated debt due to MUFG Bank, Ltd. resulting in the decline in Tier 2 capital.

In addition to capital ratios determined in accordance with regulatory requirements, we consider the tangible common equity ratio when evaluating capital utilization and adequacy. This capital ratio is monitored by management, and presented below, to further facilitate the understanding of our capital structure and for use in assessing and comparing the quality and composition of the Company’s capital structure to other financial institutions. This ratio is not codified within GAAP or federal banking regulations in effect at September 30, 2018. Therefore, it is considered a non-GAAP financial measure. Our tangible common equity ratio calculation method may differ from those used by other financial services companies.

19

The following table summarizes the calculation of the Company's tangible common equity ratio as of September 30, 2018 and December 31, 2017.

	September 30, 2018			December 31, 2017
(Dollars in millions)
Total MUAH stockholders' equity	$	18,742		$	18,255
Goodwill	(3,301		)	(3,301		)
Intangible assets, except mortgage servicing rights	(293		)	(313		)
Deferred tax liabilities related to goodwill and intangible assets	58			55
Tangible common equity (a)	$	15,206		$	14,696
Total assets	$	161,036		$	154,550
Goodwill	(3,301		)	(3,301		)
Intangible assets, except mortgage servicing rights	(293		)	(313		)
Deferred tax liabilities related to goodwill and intangible assets	58			55
Tangible assets (b)	$	157,500		$	150,991
Tangible common equity ratio (a)/(b)	9.65		%	9.73		%

The Company’s fully phased-in Common Equity Tier 1 capital ratio calculated under the U.S. Basel III standardized approach at September 30, 2018 and December 31, 2017 was estimated to be 16.58% and 16.27%, respectively. Management believes that the Company would satisfy all capital adequacy requirements under the U.S. Basel III rules on a fully phased-in basis if those requirements had been effective at both September 30, 2018 and December 31, 2017.

The following table summarizes the calculation of the Company's fully phased-in Common Equity Tier 1 capital to total risk-weighted assets ratio under the U.S. Basel III standardized approach as of September 30, 2018 and December 31, 2017.

Common Equity Tier 1 capital under U.S. Basel III (standardized approach; fully phased-in)
	September 30, 2018			December 31, 2017
(Dollars in millions)	(Estimated)			(Estimated)
Common Equity Tier 1 capital under U.S. Basel III (transitional)	$	16,467		$	15,708
Other	—			(51		)
Common Equity Tier 1 capital estimated under U.S. Basel III (standardized approach; fully phased-in) (a)	$	16,467		$	15,657
Risk-weighted assets, estimated under U.S. Basel III (standardized; transitional)	$	99,339		$	96,330
Adjustments	—			(107		)
Total risk-weighted assets, estimated under U.S. Basel III (standardized approach; fully phased-in) (b)	$	99,339		$	96,223
Common Equity Tier 1 capital to total risk-weighted assets estimated under U.S. Basel III (standardized approach; fully phased-in)(1) (a)/(b)	16.58		%	16.27		%

(1) Common Equity Tier 1 risk-based capital (standardized, fully phased-in basis) is a non-GAAP financial measure that is used by investors, analysts and bank regulatory agencies to assess the capital position of financial services companies as if the transition provisions of the U.S. Basel III rules were fully phased-in for the period in which the ratio is disclosed.  Management reviews this ratio, which excludes components of accumulated other comprehensive loss, along with other measures of capital as part of its financial analyses and has included this non-GAAP information, and the corresponding reconciliation from Common Equity Tier 1 capital (calculated according to the transition provisions under U.S. Basel III rules) because of current interest in such information by market participants.

For additional information regarding our regulatory capital requirements, see "Supervision and Regulation – Regulatory Capital and Liquidity Standards" in Part I, Item 1. "Business" in our 2017 Form 10-K.

20

Risk Management

All financial institutions must manage and control a variety of business risks that can significantly affect their financial condition and performance. Some of the key risks that the Company must manage include credit, market, liquidity, operational, interest rate, compliance, reputation and strategic risks. The Board, directly or through its appropriate committees, provides oversight and approves our various risk management policies. Management has established a risk management structure that is designed to provide a comprehensive approach for identifying, measuring, monitoring, controlling and reporting on the significant risks faced by the Company. For additional information regarding our risk management structure and framework, refer to “Risk Management” in Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 2017 Form 10-K.

Credit Risk Management

One of our principal business activities is the extension of credit to individuals and businesses. Our policies and the applicable laws and regulations governing the extension of credit require risk analysis, including an extensive evaluation of the purpose of the request and the borrower’s ability and willingness to repay as scheduled. Our process also includes ongoing portfolio and credit management through portfolio diversification, lending limit constraints, credit review and approval policies, and extensive internal monitoring. For additional information regarding our credit risk management policies, refer to “Credit Risk Management” in Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 2017 Form 10-K.

Allowance for Credit Losses

We maintain an allowance for credit losses (defined as both the allowance for loan losses and the allowance for losses on unfunded credit commitments) to absorb losses inherent in the loan portfolio as well as for unfunded credit commitments. Understanding our policies on the allowance for credit losses is fundamental to understanding our consolidated financial condition and consolidated results of operations. Accordingly, our significant accounting policies on the allowance for credit losses are discussed in detail in Note 1 "Summary of Significant Accounting Policies and Nature of Operations" to our Consolidated Financial Statements in Part II, Item 8. “Financial Statements and Supplementary Data” and in “Allowance for Credit Losses” in Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 2017 Form 10-K. During the first quarter of 2018, the Company refined its methodology for estimating the allowance for commercial loans collectively evaluated for impairment and the allowance for losses on unfunded credit commitments. Previously the Company derived the allowance for these loans by assigning a loss factor based on an internal risk rating that estimated the probability that a credit facility may ultimately default (i.e. probability of default). The refinement implemented during the first quarter of 2018 now utilizes a dual factor internal risk rating system that encompasses both the probability of default and an estimate of the severity of the loss that would be realized upon such default (i.e. the loss-given default). During the second quarter of 2018, the Company implemented refinements to the qualitative considerations used in our reserve methodology. For additional information regarding our allowance for loan losses, refer to Note 3 "Loans and Allowance for Loan Losses" to our Consolidated Financial Statements in Part I, Item 1. “Financial Statements” in this Form 10-Q.

The allowance for loan losses was $501 million at September 30, 2018 compared with $476 million at December 31, 2017. Our ratio of allowance for loan losses to total loans held for investment was 0.60% as of September 30, 2018 and 0.59% as of December 31, 2017. The provision for loan losses was $62 million and $44 million for the three and nine months endedSeptember 30, 2018, respectively, primarily due to the impact of specific reserves for impaired loans to discrete customers during the third quarter of 2018. The unallocated allowance for loan losses decreased from $30 million at December 31, 2017 to $10 million at September 30, 2018. This decrease resulted from refinements to the methodology used to measure credit risk ascribed to the commercial loan portfolio segment, which previously had been estimated within the unallocated allowance for loan losses. Net loans charged off to average total loans held for investment were 0.03% for the three and nine months endedSeptember 30, 2018, respectively, compared with 0.03% and 0.17% for the three and nine months endedSeptember 30, 2017, respectively.

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Nonaccrual loans were $411 million at September 30, 2018 compared with $465 million at December 31, 2017. The decrease in nonaccrual loans outstanding during the nine months endedSeptember 30, 2018 was primarily driven by paydowns, payoffs, and loans returned to accrual, largely offset by new nonaccrual loans. Our ratio of nonaccrual loans to total loans held for investment decreased to 0.49% at September 30, 2018 from 0.58% at December 31, 2017. Our ratio of allowance for loan losses to nonaccrual loans increased to 122.04% at September 30, 2018 from 102.37% at December 31, 2017. Criticized credits in the commercial segment were $1.5 billion at September 30, 2018 and $1.6 billion at December 31, 2017. Refer to Note 3 "Loans and Allowance for Loan Losses" to our Consolidated Financial Statements in Part I, Item 1. "Financial Statements" in this Form 10-Q for a description of criticized credits.

Change in the Allowance for Loan Losses

The following table sets forth a reconciliation of changes in our allowance for loan losses.

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017			2018			2017
Allowance for loan losses, beginning of period	$	445		$	513		$	476		$	639
(Reversal of) provision for loan losses	62			33			44			(1		)
Other	—			2			—			2
Loans charged off:
Commercial and industrial	(7		)	(5		)	(14		)	(83		)
Commercial and industrial - transfer to held for sale	—			(1		)	—			(7		)
Commercial mortgage	(1		)	(1		)	(1		)	(1		)
Total commercial portfolio	(8		)	(7		)	(15		)	(91		)
Residential mortgage	1			1			1			2
Home equity and other consumer loans	(9		)	(11		)	(28		)	(34		)
Total consumer portfolio	(8		)	(10		)	(27		)	(32		)
Total loans charged-off	(16		)	(17		)	(42		)	(123		)
Recoveries of loans previously charged-off:
Commercial and industrial	7			8			17			20
Commercial mortgage	1			—			1			1
Total commercial portfolio	8			8			18			21
Home equity and other consumer loans	2			3			5			4
Total consumer portfolio	2			3			5			4
Total recoveries of loans previously charged-off	10			11			23			25
Net loans recovered (charged-off)	(6		)	(6		)	(19		)	(98		)
Ending balance of allowance for loan losses	501			542			501			542
Allowance for losses on unfunded credit commitments	122			129			122			129
Total allowance for credit losses	$	623		$	671		$	623		$	671

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Nonperforming Assets

Nonperforming assets consist of nonaccrual loans and OREO. Nonaccrual loans are those for which management has discontinued accrual of interest because there exists significant uncertainty as to the full and timely collection of either principal or interest, or such loans have become contractually past due 90 days with respect to principal or interest. OREO includes property where the Bank acquired title through foreclosure or “deed in lieu” of foreclosure. For a more detailed discussion of the accounting for nonaccrual loans, see Note 1 "Summary of Significant Accounting Policies and Nature of Operations" to our Consolidated Financial Statements in Part II, Item 8. “Financial Statements and Supplementary Data” in our 2017 Form 10-K.

The following table sets forth the components of nonperforming assets and TDRs.

	September 30, 2018		December 31, 2017		Increase (Decrease)
(Dollars in millions)					Amount			Percent
Nonaccrual loans:
Commercial and industrial	$	268	$	319	$	(51	)	(16	)%
Commercial mortgage	12		20		(8		)	(40	)
Total commercial portfolio	280		339		(59		)	(17	)
Residential mortgage	111		104		7			7
Home equity and other consumer loans	20		22		(2		)	(9	)
Total consumer portfolio	131		126		5			4
Total nonaccrual loans	411		465		(54		)	(12	)
OREO	—		1		(1		)	(100	)
Total nonperforming assets	$	411	$	466	$	(55	)	(12	)
Troubled debt restructurings:
Accruing	$	354	$	348	$	6		2	%
Nonaccruing (included in total nonaccrual loans above)	252		229		23			10
Total troubled debt restructurings	$	606	$	577	$	29		5

Total nonperforming assets as of September 30, 2018 were $411 million, or 0.26% of total assets, compared with $466 million, or 0.30% of total assets at December 31, 2017. The decrease in nonperforming assets of $55 million from December 31, 2017 to September 30, 2018 was driven primarily by paydowns, payoffs, and loans returned to accrual, largely offset by new nonaccrual loans.

Troubled Debt Restructurings

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

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The following table provides a summary of TDRs by loan type, including nonaccrual loans and loans that have been returned to accrual status, as of September 30, 2018 and December 31, 2017. See Note 3 "Loans and Allowance for Loan Losses" to our Consolidated Financial Statements in Part I, Item 1. "Financial Statements" in this Form 10-Q for more information.

					As a Percentage of Ending Loan Balances
(Dollars in millions)	September 30, 2018		December 31, 2017		September 30, 2018		December 31, 2017
Commercial and industrial	$	253	$	202	1.02	%	0.87	%
Commercial mortgage	53		7		0.36		0.05
Construction	78		128		5.27		7.21
Total commercial portfolio	384		337		0.93		0.82
Residential mortgage	200		215		0.53		0.60
Home equity and other consumer loans	22		25		0.51		0.72
Total consumer portfolio	222		240		0.52		0.61
Total restructured loans	$	606	$	577	0.72		0.72

Loans 90 Days or More Past Due and Still Accruing

Loans held for investment 90 days or more past due and still accruing totaled $11 million and $12 million at September 30, 2018 and at December 31, 2017, respectively.

Concentration of Risk

Commercial and industrial loans are extended principally to corporations, middle-market businesses and small businesses and are originated primarily through our commercial banking offices. Our commercial and industrial portfolio is comprised primarily of the following industry sectors: finance and insurance, real estate and leasing, power and utilities, information and manufacturing. No individual industry sector exceeded 10% of our total loans held for investment at either September 30, 2018 or December 31, 2017.

Construction and commercial mortgage loans are secured by deeds of trust or mortgages. Construction loans are extended primarily to commercial property developers and to residential builders. At September 30, 2018, 59% of the Company’s construction loan portfolio was concentrated in California, 18% to borrowers in New York and 7% to borrowers in Texas. The commercial mortgage loan portfolio consists of loans secured by commercial income properties. At September 30, 2018, 66% of the Company’s commercial mortgage loans were made to borrowers located in California, 7% to borrowers in the state of Washington, and 6% to borrowers in New York.

Residential mortgage loans are originated and secured by one-to-four family residential properties, through our multi-channel network, including branches, private bankers, mortgage brokers, telephone services and web-based and mobile internet banking applications. We do not have a program for originating or purchasing subprime loan products and we hold the majority of the loans we originate.

At September 30, 2018, payment terms on 36% of our residential mortgage loans required a monthly payment that covers the full amount of interest due, but did not reduce the principal balance. At origination, these interest-only loans had strong credit profiles and had weighted average LTV ratios of approximately 65%. The remainder of the portfolio consisted of regularly amortizing loans.

Home equity and other consumer loans are originated principally through our branch network and Private Banking offices. Approximately 28% and 29% of these home equity loans and lines were supported by first liens on residential properties as of September 30, 2018 and December 31, 2017, respectively. To manage risk associated with lending commitments, we review all equity-secured lines annually for creditworthiness and may reduce or freeze limits, to the extent permitted by laws and regulations. See Note 3 "Loans and Allowance for Loan Losses" to our Consolidated Financial Statements in Part I, Item 1. “Financial Statements” in this Form 10-Q for additional information on refreshed FICO scores and refreshed LTV ratios for our residential mortgage and home equity and other consumer loans at September 30, 2018 and December 31, 2017.

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Market Risk Management

The objective of market risk management is to mitigate any adverse impact on earnings and capital arising from changes in interest rates and other market variables. Market risk management supports our broad objective of enhancing shareholder value, which encompasses the achievement of stable earnings growth while promoting capital stability over time. Market risk is defined as the risk of loss arising from an adverse change in the market value of financial instruments caused by fluctuations in market prices or rates. The primary market risk to which we are exposed is interest rate risk. Interest rate risk arises from instruments, positions and transactions entered into for purposes other than trading and for trading. Other than trading interest rate risk arises from loans, securities, deposits, borrowings, securities purchased under agreements to resell, securities sold under agreements to repurchase, securities borrowing and lending transactions, and derivative instruments. Trading interest rate risk primarily arises from trading activities at MUAH's broker-dealer subsidiary, MUSA, and derivative contracts MUB enters into as a financial intermediary for customers.

Market Risk Governance

The MRM Policy, adopted by the Risk Committee of the Board of Directors, governs the Company’s management and oversight of market risk. The MRM Policy establishes the Company’s risk tolerance by outlining standards for measuring market risk, creates Board-level limits for specific market risks, and establishes MRMC responsibilities and oversight of market risk activities.

ARC, composed of selected senior officers of the Company, supports the MRM Policy setting process by striving to ensure that the Company has an effective process to identify, monitor, measure and manage market risk as required by the MRM Policy. ARC provides oversight of the risk management framework and reviews and discusses market risk management reports and trends. MRMC approves the trading policies that govern the Company’s activities. ALCO is responsible for the approval of specific interest rate risk management programs, including those related to interest rate hedging, investment securities and wholesale funding of MUAH, along with approval of capital policies.

The Treasurer is primarily responsible for the implementation of interest rate risk management strategies approved by ALCO and for operational management of market risk, as defined above, through funding, investment and derivative hedging activities. The MRM unit is responsible for monitoring market risk and functions independently of all operating and management units and subsidiaries.

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

Interest Rate Risk Management

ALCO monitors interest rate risk from ALM activities on a monthly basis through a variety of modeling techniques that are used to quantify the sensitivity of net interest income to changes in interest rates. Our net interest income sensitivity analysis typically involves a simulation in which we estimate the net interest income impact of gradual parallel shifts in the yield curve of up 200 basis points and down 100 basis points over a 12-month horizon using a forecasted balance sheet.

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Net Interest Income Sensitivity

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

(Dollars in millions)	September 30, 2018			December 31, 2017
Effect on net interest income:
Increase 200 basis points	$	130.1		$	100.2
as a percentage of base case net interest income	3.96		%	3.21		%
Decrease 100 basis points	$	(79.9	)	$	(75.7	)
as a percentage of base case net interest income	(2.43		)%	(2.42		)%

An increase in rates increases net interest income. During the nine months endedSeptember 30, 2018, the Company's asset sensitive profile increased due to changes in balance sheet composition, changes in the ALM derivatives portfolio and forecasted balance sheet activity over the next twelve months. During the second quarter of 2018, the Company terminated receive fixed swap contracts used to hedge floating rate commercial loans, which contributed to an increase in the Company's asset sensitivity.

MUSA's securities borrowed or purchased under resale agreements and securities loaned or sold under repurchase agreements are included in the Company's net interest income sensitivity analysis. However, due to the short-term nature of these interest-bearing assets and liabilities, the Company also monitors net interest income sensitivity excluding these balances. Excluding the impact of MUSA, the Company would have a slightly greater asset sensitive risk profile at September 30, 2018.

We believe that our simulation provides management with a comprehensive view of the sensitivity of net interest income to changes in interest rates over the measurement horizon. However, as with any financial model, the underlying assumptions are inherently uncertain and subject to refinement. In particular, two significant models used in interest rate risk measurement address residential mortgage prepayment speeds and non-maturity deposit rate and balance behaviors. The mortgage prepayment model is periodically calibrated to reflect changes in customer behavior. Model performance may be adversely affected by rapid changes in interest rates, home prices and the credit environment. The deposit model uses the Company’s historical deposit pricing to forecast future deposit pricing in its scenarios. Management’s response to future rate scenarios may deviate from historical responses and actual results may differ from those derived in the simulation analysis due to unexpected market events, unanticipated changes in customer behavior, market interest rates, product pricing, and investment, funding and hedging activities.

Investment Securities

Our ALM securities portfolio includes both securities available for sale and securities held to maturity. At September 30, 2018 and December 31, 2017, our ALM securities portfolio fair values were $26.6 billion and $25.7 billion, respectively. Our ALM securities portfolio is comprised of RMBSs, Cash Flow CLOs, CMBSs, U.S. Treasury securities and government-sponsored agency securities. The portfolio had an expected weighted average life of 4.9 years at September 30, 2018. At September 30, 2018, approximately $1.7 billion of the portfolio was pledged to secure trust and public deposits and for other purposes as required or permitted by law. During the nine months ended September 30, 2018, we purchased $5.6 billion and sold $854 million of securities as part of our investment portfolio strategy, while $3.3 billion of ALM securities matured, were paid down, or were called.

Based on current prepayment projections, the estimated ALM securities portfolio’s effective duration was 3.9 at September 30, 2018, compared with 3.7 at December 31, 2017. Effective duration is a measure of price sensitivity of a bond portfolio to immediate parallel shifts in interest rates. An effective duration of 3.9 suggests an expected price decrease of approximately3.9% for an immediate 1.0% parallel increase in interest rates.

In addition to our ALM securities, our securities available for sale portfolio includes approximately $1.3 billion of direct bank purchase bonds that are largely managed within our Regional Bank and U.S. Wholesale & Investment Banking operating segments. These instruments are accounted for as securities, but underwritten

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as loans with terms that are closely aligned with traditional commercial loan features, and are subject to national bank regulatory lending authority standards. These instruments typically are not issued in bearer form, nor are they registered with the SEC or the Depository Trust Company. Additionally, these instruments generally contain certain transferability restrictions and are not assigned external credit ratings. 

ALM and Other Risk Management Derivatives

The notional amount and gross fair value of the ALM derivatives portfolio decreased during the nine months endedSeptember 30, 2018 as the Company terminated receive fixed swap contracts used to hedge floating rate commercial loans in order to increase earnings at risk sensitivity given expectations of rising rates. Other risk management derivatives are primarily used to manage non-interest rate related risks. For additional discussion of derivative instruments and our hedging strategies, see Note 9 "Derivative Instruments and Other Financial Instruments Used for Hedging" to our Consolidated Financial Statements in Part I, Item 1. “Financial Statements” in this Form 10-Q.

(Dollars in millions)	September 30, 2018			December 31, 2017			Increase (Decrease)
Total gross notional amount of ALM and other risk management derivatives
ALM derivatives:
Interest rate swap receive fixed contracts	$	179		$	7,498		$	(7,319	)
Total ALM derivatives	179			7,498			(7,319		)
Other risk management derivatives	1,232			1,345			(113		)
Total ALM and other risk management derivatives	$	1,411		$	8,843		$	(7,432	)
Fair value of ALM and other risk management derivatives
ALM derivatives:
Gross positive fair value	$	4		$	2		$	2
Gross negative fair value	—			149			(149		)
Positive (negative) fair value of ALM derivatives, net	4			(147		)	151
Other risk management derivatives:
Gross positive fair value	1			3			(2		)
Gross negative fair value	25			9			16
Positive (negative) fair value of other risk management derivatives, net	(24		)	(6		)	(18		)
Positive (negative) fair value of ALM and other risk management derivatives, net	$	(20	)	$	(153	)	$	133

Trading Activities

Trading activities consist primarily of activities at MUAH's broker-dealer subsidiary, MUSA, and derivative contracts MUB enters into as a financial intermediary for customers. MUSA transacts as principal and agent for a variety of securities and exchange traded derivatives. By acting as a financial intermediary, MUB is able to provide our customers with access to a range of products from the securities, foreign exchange and derivatives markets. We generally take offsetting positions to mitigate our exposure to market risk.

The Company monitors market risk from trading activities by utilizing a combination of position limits, VaR, and stop-loss limits, applied at an aggregated level and to various sub-components within those limits. Positions are controlled and reported both in notional and VaR terms. Our calculation of VaR estimates how high the loss in fair value might be, at a 99% confidence level, due to an adverse shift in market prices over a period of ten business days. VaR at the trading activity level is managed within the maximum limit of $38 million established by Board policy for total trading positions. The VaR model incorporates assumptions on key parameters, including holding period and historical volatility.

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The following table sets forth the average, high and low 10-day 99% confidence level VaR for our trading activities for the three months ended September 30, 2018 and September 30, 2017.

(Dollars in millions)	September 30, 2018		September 30, 2017
Average VaR	$	11.8	$	9.3
High VaR	14.7		12.7
Low VaR	7.8		7.0

Consistent with our business strategy of focusing on the sale of capital markets products to customers, we manage our trading risk exposures at relatively low levels. Our foreign exchange business continues to derive the majority of its revenue from customer-related transactions.

The following table provides the fair value of our trading account portfolio as of September 30, 2018 and December 31, 2017, and the change in fair value between September 30, 2018 and December 31, 2017.

(Dollars in millions)	September 30, 2018			December 31, 2017		Increase (Decrease)
Fair value of trading account assets:
U.S. Treasury securities	$	2,968		$	1,926	$	1,042
Corporate bonds	1,428			1,054		374
Mortgage-backed securities	5,511			6,339		(828		)
Derivatives (including netting adjustment)	461			712		(251		)
Other	845			536		309
Trading account assets	$	11,213		$	10,567	$	646
Fair value of trading account liabilities:
U.S. Treasury securities	$	2,518		$	2,709	$	(191	)
Corporate bonds	853			348		505
Derivatives (including netting adjustment)	548			501		47
Other	110			42		68
Trading account liabilities	$	4,029		$	3,600	$	429
Additional trading account derivative detail:
Total gross notional amount of positions held for trading purposes:
Interest rate contracts	$	120,613		$	132,214	$	(11,601	)
Commodity contracts	453			1,244		(791		)
Foreign exchange contracts	8,099			7,053		1,046
Equity contracts	503			1,496		(993		)
Other contracts	39			4		35
Total	$	129,707		$	142,011	$	(12,304	)
Fair value of positions held for trading purposes:
Gross positive fair value	$	767		$	1,317	$	(550	)
Gross negative fair value	838			969		(131		)
Positive (negative) fair value of positions, net	$	(71	)	$	348	$	(419	)

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Liquidity Risk Management

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

The management of liquidity risk is governed by MUAH ALM and Liquidity Risk Management Policies. The MUAH ALM Policy is under the oversight of ALCO, which oversees first line liquidity risk management activities conducted by Treasury. Treasury formulates the funding, liquidity and contingency planning strategies for the Company, the Bank and MUSA, and is responsible for identifying, managing and reporting on liquidity risk. The Liquidity Risk Management Policies for the Company, the Bank and MUSA are under the oversight of the ARC and the Risk Committee of the Board. MRM conducts independent oversight and governance of liquidity risk management activities to establish sound policies and effective risk and independent monitoring controls. We are also subject to a Contingency Funding Plan framework that identifies actions to be taken to help ensure adequate liquidity if an event should occur that disrupts or adversely affects the normal funding activities of the Company, the Bank or MUSA.

Liquidity risk is managed using a total balance sheet perspective that analyzes all sources and uses of liquidity including loans, investments, deposits and borrowings, as well as off-balance sheet exposures. Although we make an effort to diversify our sources of liquidity, as discussed below, we will be required to maintain a minimum amount of TLAC-eligible debt due to affiliates beginning January 1, 2019. Various tools are used to measure and monitor liquidity, including forecasting of the sources and uses of cash flows over multiple time horizons and stress testing of the forecasts under various scenarios. Stress testing, which incorporates both institution-specific and systemic market scenarios, as well as a combination scenario that adversely affects the Company's liquidity position and profile, facilitates the identification of appropriate remedial measures to help ensure that the Company maintains adequate liquidity in adverse conditions. Such measures may include extending the maturity profile of liabilities, optimizing liability levels through pricing strategies, adding new funding sources, altering dependency on certain funding sources, adjusting asset growth and financing or selling assets.

In December 2016, the Federal Reserve finalized rules imposing new TLAC requirements on GSIBs with operations in the U.S., such as MUFG. The final rule includes an Internal TLAC requirement which sets a minimum amount of loss-absorbing instruments, which must be issued by the Company to MUFG or MUFG Bank, Ltd. (or another wholly-owned non-U.S. subsidiary of MUFG) due to MUFG's single point of entry resolution approach. These loss absorbing instruments are comprised of Tier 1 regulatory capital and long-term debt. TLAC Tier 1 regulatory capital is designed to absorb ongoing losses, while the conversion of TLAC-eligible long-term debt into common equity of the Company is intended to recapitalize the Company prior to any bankruptcy or insolvency proceedings. The Company will be required to comply with these new rules by January 1, 2019. During the fourth quarter of 2018, the Company expects to restructure existing debt issued to MUFG Bank, Ltd. and replace a portion of its externally-placed debt with the issuance of internal TLAC-eligible debt issued to MUFG Bank, Ltd. in order to comply with the new rules. See "Supervision and Regulation – Dodd-Frank Act and Related Regulations" in Part I, Item 1. "Business" in our 2017 Form 10-K.

We maintain a substantial level of available liquidity in the form of on-balance sheet and off-balance sheet funding sources. Sources of liquidity include cash at the Federal Reserve, unencumbered liquid securities, and capacity to borrow on a secured basis at the FHLB of San Francisco and the Federal Reserve Bank’s Discount Window. Total unpledged securities were $24.8 billion at September 30, 2018. Our primary funding sources are customer deposits, secured FHLB advances, and unsecured short-term and long-term debt. Total deposits increased $3.0 billion from $84.8 billion at December 31, 2017 to $87.8 billion at September 30, 2018. As of September 30, 2018, the Bank had $11.9 billion of borrowings outstanding with the FHLB of San Francisco, and the Bank had a remaining unused borrowing capacity from the FHLB of San Francisco of $19.9 billion. The Bank maintains a $12.0 billion unsecured bank note program. Available funding under the bank note program was $5.9 billion at September 30, 2018. Subject to market conditions, the Bank may, in the fourth quarter of 2018, issue additional notes under its unsecured bank note program. We do not have any firm commitments in place to sell additional notes under this program.

In addition to managing liquidity risk on a consolidated basis and at each of the major subsidiaries (the Bank and MUSA), we assess and monitor liquidity at the parent company (MUAH) and the other non-bank subsidiaries. The parent company maintains sufficient liquidity to meet expected obligations, without access to

29

the wholesale funding markets or dividends from subsidiaries, for at least 20 months. At September 30, 2018, the parent company’s liquidity exceeded 20 months.

MUAH and its subsidiaries may borrow on a long-term basis from MUFG Bank, Ltd. and affiliates. As of September 30, 2018, the Company had total long-term debt issued to MUFG Bank, Ltd. and affiliates of $5.2 billion.

The Company’s total wholesale funding included $12.3 billion of long-term debt (excluding nonrecourse debt) and $8.3 billion of short-term debt at September 30, 2018. For additional information regarding our outstanding debt, refer to Note 6 "Commercial Paper and Other Short-Term Borrowings" and Note 7 "Long-Term Debt" to our Consolidated Financial Statements in Part I, Item 1. “Financial Statements” in this Form 10-Q. On October 5, 2018, the Company gave notice of its election to redeem $100,000,000 principal amount of its outstanding 3.000% Senior Notes due 2025, leaving $400,000,000 principal amount of such notes outstanding and also gave notice of its election to redeem all of the $1,000,000,000 principal amount outstanding of its 2.250% Senior Notes due 2020. We evaluate and monitor the stability and reliability of our various funding sources to help ensure that we have sufficient liquidity in adverse circumstances.

Our costs and ability to raise funds in the capital markets are influenced by our credit ratings. In April 2018, Standard & Poor's revised the outlook on MUAH, MUB and MUSA to positive from stable following a similar revision to MUFG’s outlook. The change in MUFG’s outlook is a result of Standard & Poor's revising the outlook on the long-term sovereign rating of Japan to positive from stable. The following table provides our credit ratings as of September 30, 2018.

		MUFG Union Bank, N.A.		MUFG Securities Americas Inc.	MUFG Americas Holdings Corporation
		Deposits	Senior Debt	Senior Debt	Senior Debt
Standard & Poor's	Long-term	–	A	A	A-
	Short-term	–	A-1	A-1	A-2
Moody's	Long-term	Aa2	A2	–	A2
	Short-term	P-1	P-1	–	–
Fitch	Long-term	A+	A	A	A
	Short-term	F1	F1	F1	F1

For additional information, including information about rating agency assessments, see “The Bank of Tokyo-Mitsubishi UFJ’s and Mitsubishi UFJ Financial Group’s credit ratings and financial or regulatory condition could adversely affect our operations” and "Our credit ratings are important in order to maintain liquidity" in Part I, Item 1A. "Risk Factors" in our 2017 Form 10-K.

Operational Risk Management

Operational risk is defined as the risk of loss resulting from inadequate or failed internal processes, people and systems or from external events. Operational risk includes legal risk, which includes exposure to fines, penalties, or punitive damages resulting from supervisory actions, as well as private settlements, but excludes strategic and reputation risk. In particular, information security is a significant operational risk element for the Company and includes the risk of losses resulting from cyber-attacks or other related cyber incidents. See “We are subject to a wide array of operational risks, including, but not limited to, cyber-security risks” in Part I, Item 1A. “Risk Factors” in our 2017 Form 10-K. Operational risk is mitigated through a system of internal controls that are designed to keep these risks at appropriate levels. For additional information regarding our operational risk management policies, see “Operational Risk Management” in Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 2017 Form 10-K.

30

Business Segments

The Company has four reportable segments: Regional Bank, U.S. Wholesale & Investment Banking, Transaction Banking, and MUSA. For a more detailed description of these reportable segments, refer to Note 13 "Business Segments" to our Consolidated Financial Statements in Part I, Item 1. “Financial Statements” in this Form 10-Q.

Unlike U.S. Generally Accepted Accounting Principles (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 our business units if they were separate economic entities. The information set forth in the tables that follow is prepared using various management accounting methodologies to measure the performance of the individual segments. During the normal course of business, the Company occasionally changes or updates its management accounting methodologies or organizational structure. Certain non-bank subsidiaries, including MUSA, are reported based on their GAAP results. For a description of these methodologies, see Note 13 "Business Segments" to our Consolidated Financial Statements in Part I, Item 1. “Financial Statements” in this Form 10-Q.

In the second quarter of 2018, the Company began measuring the performance of its business segments by reporting revenues and expenses from products and services sold entirely within the business segment that manages the customer relationship. The Company previously applied a “market view” perspective in measuring the business segments, which reported revenues and expenses from products and services sold in both the business segment that provided the product and the business segment that managed the customer relationship. Prior period results have been revised to conform to the current period presentation.

Regional Bank

The Regional Bank offers a wide range of financial products and services to individuals and businesses on the West Coast. Capabilities are delivered through a network of retail and private banking offices, digital channels, relationship managers, call centers and ATMs.

Consumers have access to checking and deposit accounts, residential mortgage loans, consumer loans, home equity lines of credit, credit cards, bill and loan payment services, and merchant services. Additionally, online deposit savings products are offered through PurePoint Financial which provides services to customers online and through a call center and a network of financial centers.

Commercial clients with up to $1 billion in annual revenue have access to commercial and asset-based loans, and professional real estate developers are offered financing solutions for existing properties and construction projects. Through partnerships with other areas of the Bank, these clients also have access to non-credit products and services including global treasury management, capital markets solutions, foreign exchange, interest rate risk and commodity risk management products and services.

The Wealth Markets Division serves corporate, institutional, non-profit and individual clients. Products and services include wealth planning, trust and estate services, investment management, brokerage and private wealth management.

31

The following table sets forth the results for the Regional Bank segment.

Regional Bank
	For the Three Months Ended   September 30,				Increase (Decrease)					For the Nine Months Ended September 30,				Increase (Decrease)
(Dollars in millions)	2018		2017		Amount			Percent		2018		2017		Amount			Percent
Results of operations
Net interest income	$	553	$	516	$	37		7	%	$	1,620	$	1,527	$	93		6	%
Noninterest income	111		108		3			3		338		326		12			4
Total revenue	664		624		40			6		1,958		1,853		105			6
Noninterest expense	518		487		31			6		1,552		1,483		69			5
(Reversal of) provision for credit losses	45		19		26			137		52		39		13			33
Income before income taxes and including noncontrolling interests	101		118		(17		)	(14	)	354		331		23			7
Income tax expense (1)	17		31		(14		)	(45	)	68		87		(19		)	(22	)
Net income (loss) attributable to MUAH	$	84	$	87	$	(3	)	(3	)	$	286	$	244	$	42		17
Average balances
Total loans held for investment	$	66,911	$	61,101	$	5,810		10	%	$	65,697	$	60,276	$	5,421		9	%
Total assets	70,681		64,902		5,779			9		69,465		64,140		5,325			8
Total deposits	56,442		54,964		1,478			3		54,884		54,388		496			1

(1) Income tax expense includes certain management accounting classification adjustments.

Net interest income increased during the three and nine months endedSeptember 30, 2018 compared with the prior year periods, primarily due to balance sheet growth in loans and higher spreads on deposits, partially offset by continued margin compression on loans. Noninterest expense increased in the three and nine months endedSeptember 30, 2018, due primarily to the launch of new business lines and increased support function costs. The provision for credit losses during 2018 was primarily due to specific reserves for credit losses in the third quarter of 2018 and increases in outstanding balances related to marketplace lending. The provision for credit losses during 2017 was primarily due to a reserve build related to the commercial portfolio and retail credit card losses.

32

U.S. Wholesale & Investment Banking

U.S. Wholesale & Investment Banking delivers the full suite of MUAH products and services to large and mid-corporate customers. 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 and Nonprofit, Public Finance, and Financial Institutions (predominantly Insurance and Asset Managers). U.S. Wholesale & Investment Banking provides customers general corporate credit and structured credit services, including project finance, leasing and equipment finance, commercial finance, funds finance and securitizations. By working with the Company's other segments, U.S. Wholesale & Investment Banking offers its customers a range of noncredit services, which include global treasury management, capital market solutions, and various foreign exchange, interest rate risk and commodity risk management products.

The following table sets forth the results for the U.S. Wholesale & Investment Banking segment.

U.S. Wholesale & Investment Banking
	For the Three Months Ended   September 30,						Increase (Decrease)					For the Nine Months Ended September 30,					Increase (Decrease)
(Dollars in millions)	2018			2017			Amount			Percent		2018		2017			Amount			Percent
Results of operations
Net interest income	$	104		$	107		$	(3	)	(3	)%	$	307	$	333		$	(26	)	(8	)%
Noninterest income	103			91			12			13		283		296			(13		)	(4	)
Total revenue	207			198			9			5		590		629			(39		)	(6	)
Noninterest expense	106			98			8			8		310		298			12			4
(Reversal of) provision for credit losses	27			(9		)	36			400		3		(51		)	54			106
Income (loss) before income taxes and including noncontrolling interests	74			109			(35		)	(32	)	277		382			(105		)	(27	)
Income tax expense (benefit) (1)	(3		)	19			(22		)	(116	)	133		89			44			49
Net income (loss) attributable to MUAH	$	77		$	90		$	(13	)	(14	)	$	144	$	293		$	(149	)	(51	)
Average balances
Total loans held for investment	$	15,761		$	17,280		$	(1,519	)	(9	)%	$	15,756	$	17,880		$	(2,124	)	(12	)%
Total assets	19,825			21,709			(1,884		)	(9	)	19,943		22,525			(2,582		)	(11	)
Total deposits	7,864			8,558			(694		)	(8	)	8,065		9,016			(951		)	(11	)

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

Net interest income decreased during the three and nine months endedSeptember 30, 2018 compared with the same prior year periods due primarily to lower average loan balances. Noninterest income decreased during the nine months endedSeptember 30, 2018 due to lower fees from capital markets activities. The provision for credit losses during 2018 was primarily due to the impact of specific reserves for credit losses during the third quarter of 2018. The reversal of provision for credit losses during 2017 was due to general improvement in customer credit quality.

33

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. The client base consists of financial institutions, corporations, government agencies, insurance companies, mutual funds, investment managers and non-profit organizations.

The following table sets forth the results for the Transaction Banking segment.

Transaction Banking
	For the Three Months Ended   September 30,						Increase (Decrease)					For the Nine Months Ended September 30,						Increase (Decrease)
(Dollars in millions)	2018			2017			Amount			Percent		2018			2017			Amount			Percent
Results of operations
Net interest income	$	66		$	64		$	2		3	%	$	197		$	179		$	18		10	%
Noninterest income	15			19			(4		)	(21	)	44			48			(4		)	(8	)
Total revenue	81			83			(2		)	(2	)	241			227			14			6
Noninterest expense	65			56			9			16		186			171			15			9
(Reversal of) provision for credit losses	(3		)	(1		)	(2		)	(200	)	(4		)	(1		)	(3		)	(300	)
Income before income taxes and including noncontrolling interests	19			28			(9		)	(32	)	59			57			2			4
Income tax expense (1)	5			11			(6		)	(55	)	16			23			(7		)	(30	)
Net income (loss) attributable to MUAH	$	14		$	17		$	(3	)	(18	)	$	43		$	34		$	9		26
Average balances
Total loans held for investment	$	38		$	33		$	5		15	%	$	35		$	44		$	(9	)	(20	)%
Total assets	890			1,063			(173		)	(16	)	943			1,116			(173		)	(16	)
Total deposits	15,048			16,943			(1,895		)	(11	)	15,370			16,966			(1,596		)	(9	)

(1) Income tax expense includes certain management accounting classification adjustments.

Transaction Banking earns revenue primarily from a net interest income funds transfer pricing credit on deposit liabilities, as well as service charges on deposit accounts and trust management fees. The increase in net interest income during the three and nine months endedSeptember 30, 2018 compared with the prior year periods was driven by widening spreads on deposits, partially offset by lower average deposit balances. The increase in noninterest expense during the three and nine months endedSeptember 30, 2018 compared with the prior year periods was primarily due to increased support function costs.

34

MUFG Securities Americas

MUSA is MUAH's broker-dealer subsidiary which engages in capital markets origination transactions, private placements, collateralized financings, securities borrowing and lending transactions, and domestic and foreign debt and equity securities transactions.

The following table sets forth the results for the MUSA segment.

MUSA
	For the Three Months Ended   September 30,				Increase (Decrease)					For the Nine Months Ended September 30,				Increase (Decrease)
(Dollars in millions)	2018		2017		Amount			Percent		2018		2017		Amount			Percent
Results of operations
Net interest income	$	52	$	62	$	(10	)	(16	)%	$	157	$	178	$	(21	)	(12	)%
Noninterest income	94		100		(6		)	(6	)	259		272		(13		)	(5	)
Total revenue	146		162		(16		)	(10	)	416		450		(34		)	(8	)
Noninterest expense	121		119		2			2		353		336		17			5
Income before income taxes and including noncontrolling interests	25		43		(18		)	(42	)	63		114		(51		)	(45	)
Income tax expense (1)	6		18		(12		)	(67	)	15		45		(30		)	(67	)
Net income (loss) attributable to MUAH	$	19	$	25	$	(6	)	(24	)	$	48	$	69	$	(21	)	(30	)
Average balances
Total loans held for investment	$	—	$	—	$	—		—	%	$	—	$	—	$	—		—	%
Total assets	33,473		31,764		1,709			5		33,494		31,202		2,292			7
Total deposits	—		—		—			—		—		—		—			—

(1) Income tax expense includes certain management accounting classification adjustments.

Net interest income decreased during the three and nine months endedSeptember 30, 2018 compared with the three and nine months endedSeptember 30, 2017, primarily due to an increase in short term interest rates on borrowings to fund trading assets. Noninterest income decreased during the nine months endedSeptember 30, 2018 due primarily to decreases in trading account income and investment banking fees, largely offset by higher fees from affiliates. Noninterest expense increased primarily due to increases in affiliate revenue sharing expense.

35

Other

"Other" includes the MUFG Fund Services segment, Markets segment, Japanese Corporate Banking segment, Corporate Treasury, and certain corporate activities of the Company. MUFG Fund Services provides comprehensive investment fund administrative solutions. Markets provides risk management solutions, including foreign exchange, interest rate and energy risk management solutions. Japanese Corporate Banking 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. Corporate Treasury is responsible for ALM, wholesale funding, and the ALM investment securities and derivatives hedging portfolios.

In addition, "Other" includes the net impact of funds transfer pricing charges and credits allocated to the reportable segments; the residual costs of support groups; fees from affiliates and noninterest expenses associated with MUFG Bank, Ltd.'s U.S. branch banking operations; 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 FDIC covered assets.

The following table sets forth the results for Other.

Other
	For the Three Months Ended   September 30,					Increase (Decrease)					For the Nine Months Ended September 30,						Increase (Decrease)
(Dollars in millions)	2018			2017		Amount			Percent		2018			2017			Amount			Percent
Results of operations
Net interest income	$	57		$	67	$	(10	)	(15	)%	$	201		$	188		$	13		7	%
Noninterest income	303			197		106			54		680			550			130			24
Total revenue	360			264		96			36		881			738			143			19
Noninterest expense	249			222		27			12		825			657			168			26
(Reversal of) provision for credit losses	(5		)	9		(14		)	(156	)	(8		)	(21		)	13			62
Income before income taxes and including noncontrolling interests	116			33		83			252		64			102			(38		)	(37	)
Income tax benefit (1)	10			30		(20		)	(67	)	(211		)	11			(222		)	nm
Net income (loss) including noncontrolling interests	106			3		103			nm		275			91			184			202
Deduct: net (income) loss from noncontrolling interests	6			10		(4		)	(40	)	20			25			(5		)	(20	)
Net income (loss) attributable to MUAH	$	112		$	13	$	99		nm		$	295		$	116		$	179		154
Average balances
Total loans held for investment	$	454		$	633	$	(179	)	(28	)%	$	467		$	314		$	153		49	%
Total assets	35,942			33,257		2,685			8		35,364			31,630			3,734			12
Total deposits	7,429			4,798		2,631			55		6,614			5,353			1,261			24

(1) Income tax benefit includes certain management accounting classification adjustments.

36

Critical Accounting Estimates

MUAH’s consolidated financial statements are prepared in accordance with GAAP, which includes management estimates and judgments. The financial information contained within our statements is, to a significant extent, financial information that is based on estimates used to measure the financial effects of transactions and events that have already occurred. A variety of factors could affect the ultimate value that is obtained either when earning income, recognizing an expense, recovering an asset or relieving a liability. For example, we use discount factors and other assumptions to measure certain assets and liabilities. A change in the discount factor or other important assumptions could significantly increase or decrease the reported amounts of those assets and liabilities and result in either a beneficial or an adverse impact to our financial results. As discussed in "Allowance for Credit Losses" in Part I, Item 2. "Management's Discussion and Analysis of Financial Condition and Results of Operations" in this Form 10-Q, beginning in the first quarter of 2018 we estimate probability of default and the loss severity associated with the default (i.e. the loss-given default) to estimate the credit losses inherent in our loan and lease portfolios held for investment and certain off-balance sheet commitments on the balance sheet date. Actual losses could differ significantly from our loss estimates. Other significant estimates that we use include the valuation of certain derivatives and securities, the assumptions used in measuring our transfer pricing revenue, pension obligations, goodwill impairment, and assumptions regarding our effective tax rates. Management has reviewed and approved these critical accounting policies and has discussed these policies with the Audit & Finance Committee.

Understanding our accounting policies is fundamental to understanding our consolidated financial condition and consolidated results of operations. Accordingly, both our critical accounting estimates and our significant accounting policies are discussed in detail in our 2017 Form 10-K. There were no material changes to these critical accounting estimates during the third quarter of 2018.

Non-GAAP Financial Measures

The following table presents a reconciliation between certain Generally Accepted Accounting Principles (GAAP) amounts and specific non-GAAP measures used to calculate return on average MUAH tangible common equity for the three and nine months endedSeptember 30, 2018 and 2017.

	For the Three Months Ended						For the Nine Months Ended
(Dollars in millions)	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
Net income attributable to MUAH	$	306		$	232		$	816		$	756
Add: intangible asset amortization, net of tax	5			5			15			13
Net income attributable to MUAH, excluding intangible asset amortization (a)	$	311		$	237		$	831		$	769
Average MUAH stockholders' equity	$	18,682		$	18,485		$	18,376		$	17,827
Less: Goodwill	3,301			3,301			3,301			3,250
Less: Intangible assets, except mortgage servicing rights	296			326			303			253
Less: Deferred tax liabilities related to goodwill and intangible assets	(58		)	(76		)	(57		)	(76		)
Average MUAH tangible common equity (b)	$	15,143		$	14,934		$	14,829		$	14,400
Return on average MUAH tangible common equity (1) (a)/(b)	8.22		%	6.35		%	7.47		%	7.10		%

(1)     Annualized.

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

We are disclosing the following information pursuant to Section 13(r) of the Securities Exchange Act of 1934 (Exchange Act), which requires an issuer to disclose whether it or any of its affiliates knowingly engaged in certain activities, transactions or dealings relating to Iran or with natural persons or entities designated by the U.S. government under specified Executive Orders. The scope of activities that must be reported includes activities not prohibited by U.S. law and conducted outside the United States in compliance with applicable local law. Because we are indirectly wholly-owned by MUFG, a Japanese corporation, our disclosure includes activities, transactions or dealings conducted outside the United States by non-U.S. affiliates of MUFG which are not controlled by us. We have requested that MUFG provide us a description of reportable activity under Section 13(r) and have received the following information:

During the quarter ended September 30, 2018, a non-U.S. subsidiary of MUFG engaged in business activities with entities in, or affiliated with, Iran, including counterparties owned or controlled by the Iranian government. Specifically, MUFG’s non-U.S. banking subsidiary, MUFG Bank, issued letters of credit and guarantees and provided remittance and other settlement services mainly in connection with customer transactions related to the purchase and exportation of Iranian crude oil to Japan, and in some cases, in connection with other petroleum-related transactions with Iran by its customers. These transactions did not involve U.S. dollars nor clearing services of U.S. banks for the settlement of payments. For the quarter ended September 30, 2018, the aggregate interest and fee income relating to these transactions was less than ¥40 million, representing less than 0.005 percent of MUFG’s total interest and fee income. Some of these transactions were conducted through the use of non-U.S. dollar correspondent accounts and other similar settlement accounts maintained with MUFG Bank outside the United States by Iranian financial institutions and other entities in, or affiliated with, Iran. In addition to such accounts, MUFG Bank receives deposits in Japan from, and provides settlement services in Japan to, fewer than 10 Iranian government-related entities and fewer than 100 Iranian government-related individuals such as Iranian diplomats, and maintains settlement accounts outside the United States for certain other financial institutions specified in Executive Order 13382, which settlement accounts were frozen in accordance with applicable laws and regulations. For the quarter ended September 30, 2018, the average aggregate balance of deposits held in these accounts represented less than 0.1 percent of the average balance of MUFG’s total deposits. The fee income from the transactions attributable to these account holders was less than ¥8 million, representing less than 0.005 percent of MUFG’s total fee income. Although there was no outstanding balance as of September 30, 2018, MUFG Bank had, during the quarter ended September 30, 2018, loans that were arranged prior to changes in applicable laws and regulations to borrowers in, or affiliated with, Iran, including entities owned by the Iranian government. For the quarter ended September 30, 2018, the agent fee income relating to these loan transactions was less than ¥20 million, representing less than 0.005 percent of MUFG’s total interest and fee income.

We understand that MUFG Bank recognizes that following the withdrawal in May 2018 by the United States from the Joint Comprehensive Plan of Action, the United States has imposed secondary sanctions against non-U.S. persons who engage in or facilitate a broad range of transactions and activities involving Iran. We understand that MUFG Bank will take the recent sanctions related developments into account and monitor any future transactions relating to Iran in order to comply with applicable U.S. and Japanese regulations as well as U.S., Japanese and other international sanctions.

Item 3.   Quantitative and Qualitative Disclosures About Market Risk

A discussion of our market risk exposure is incorporated by reference to Part I, Item 2. "Management's Discussion and Analysis of Financial Condition and Results of Operations" under the caption “Risk Management - Market Risk Management” and to Part II, Item 1A. "Risk Factors" in this Form 10-Q.

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Item 4.   Controls and Procedures

Disclosure Controls and Procedures. As of the end of the period covered by this report, an evaluation was carried out under the supervision and with the participation of the Company's management, including its Chief Executive Officer and its Chief Financial Officer, of the effectiveness of its disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934). Based on that evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that these disclosure controls and procedures were effective.

Internal Control Over Financial Reporting. During the third quarter of 2018, there were no changes in our internal control over financial reporting that materially affected, or were reasonably likely to materially affect, our internal control over financial reporting.

39

PART I. FINANCIAL INFORMATION

Item 1.   Financial Statements

MUFG Americas Holdings Corporation and Subsidiaries

Consolidated Statements of Income

(Unaudited)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017			2018			2017
Interest Income
Loans	$	844		$	738		$	2,426		$	2,170
Securities	168			149			491			407
Securities borrowed or purchased under resale agreements	171			97			454			243
Trading assets	109			89			308			245
Other	25			10			58			28
Total interest income	1,317			1,083			3,737			3,093
Interest Expense
Deposits	124			62			278			169
Commercial paper and other short-term borrowings	46			17			121			35
Long-term debt	92			66			266			183
Securities loaned or sold under repurchase agreements	193			102			509			245
Trading liabilities	30			20			81			56
Total interest expense	485			267			1,255			688
Net Interest Income	832			816			2,482			2,405
(Reversal of) provision for credit losses	64			18			43			(34		)
Net interest income after (reversal of) provision for credit losses	768			798			2,439			2,439
Noninterest Income
Service charges on deposit accounts	44			47			134			142
Trust and investment management fees	30			32			89			91
Trading account activities	(5		)	(3		)	(13		)	(10		)
Securities gains, net	1			6			4			15
Credit facility fees	23			26			69			75
Brokerage commissions and fees	18			16			55			52
Card processing fees, net	12			10			37			34
Investment banking and syndication fees	108			106			285			288
Fees from affiliates	306			209			881			639
Other, net	89			66			63			166
Total noninterest income	626			515			1,604			1,492
Noninterest Expense
Salaries and employee benefits	652			621			2,000			1,881
Net occupancy and equipment	89			87			264			256
Professional and outside services	110			101			356			316
Software	73			49			213			142
Regulatory assessments	24			22			69			61
Intangible asset amortization	6			8			20			22
Other	105			94			304			267
Total noninterest expense	1,059			982			3,226			2,945
Income before income taxes and including noncontrolling interests	335			331			817			986
Income tax expense (benefit)	35			109			21			255
Net Income Including Noncontrolling Interests	300			222			796			731
Deduct: Net loss from noncontrolling interests	6			10			20			25
Net Income Attributable to MUAH	$	306		$	232		$	816		$	756

See accompanying Notes to Consolidated Financial Statements.

40

MUFG Americas Holdings Corporation and Subsidiaries

Consolidated Statements of Comprehensive Income

(Unaudited)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017			2018			2017
Net Income Attributable to MUAH	$	306		$	232		$	816		$	756
Other Comprehensive Income (Loss), Net of Tax:
Net change in unrealized gains (losses) on cash flow hedges	8			(3		)	(58		)	(11		)
Net change in unrealized gains (losses) on investment securities	(46		)	17			(277		)	76
Foreign currency translation adjustment	—			4			(2		)	7
Pension and other postretirement benefit adjustments	10			7			30			20
Other	—			1			(1		)	1
Total other comprehensive income (loss)	(28		)	26			(308		)	93
Comprehensive Income (Loss) Attributable to MUAH	278			258			508			849
Comprehensive income (loss) from noncontrolling interests	(6		)	(10		)	(20		)	(25		)
Total Comprehensive Income (Loss)	$	272		$	248		$	488		$	824

See accompanying Notes to Consolidated Financial Statements.

41

MUFG Americas Holdings Corporation and Subsidiaries

Consolidated Balance Sheets

(Unaudited)

(Dollars in millions, except per share amount)	September 30, 2018			December 31, 2017
Assets
Cash and due from banks	$	1,884		$	2,057
Interest bearing deposits in banks	2,308			1,335
Total cash and cash equivalents	4,192			3,392
Securities borrowed or purchased under resale agreements	21,265			20,894
Trading account assets (includes $1,578 at September 30, 2018 and $1,001 at December 31, 2017 pledged as collateral that may be repledged)	11,213			10,567
Securities available for sale (includes $61 at September 30, 2018 and $163 at December 31, 2017 pledged as collateral that may be repledged)	17,077			17,563
Securities held to maturity (fair value $10,972 at September 30, 2018 and $9,799 at December 31, 2017)	11,320			9,885
Loans held for investment	83,653			80,014
Allowance for loan losses	(501		)	(476		)
Loans held for investment, net	83,152			79,538
Premises and equipment, net	624			610
Goodwill	3,301			3,301
Other assets	8,892			8,800
Total assets	$	161,036		$	154,550
Liabilities
Deposits:
Noninterest bearing	$	32,225		$	32,602
Interest bearing	55,586			52,185
Total deposits	87,811			84,787
Securities loaned or sold under repurchase agreements	27,032			26,437
Commercial paper and other short-term borrowings	8,309			7,066
Long-term debt	12,796			12,162
Trading account liabilities	4,029			3,600
Other liabilities	2,237			2,143
Total liabilities	142,214			136,195
Commitments, contingencies and guarantees—See Note 12
Equity
MUAH stockholders' equity:
Preferred stock:
Authorized 5,000,000 shares; no shares issued or outstanding	—			—
Common stock, par value $1 per share:
Authorized 1,700,000,000 shares, 147,589,713 shares issued and outstanding as of September 30, 2018 and December 31, 2017	148			148
Additional paid-in capital	8,158			8,197
Retained earnings	11,749			10,936
Accumulated other comprehensive loss	(1,313		)	(1,026		)
Total MUAH stockholders' equity	18,742			18,255
Noncontrolling interests	80			100
Total equity	18,822			18,355
Total liabilities and equity	$	161,036		$	154,550

See accompanying Notes to Consolidated Financial Statements.

42

MUFG Americas Holdings Corporation and Subsidiaries

Consolidated Statements of Changes in Stockholders' Equity

(Unaudited)

	MUAH Stockholders' Equity
(Dollars in millions)	Common Stock		Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests			Total Equity
Balance, December 31, 2016	$	144	$	7,884		$	10,101		$	(896	)	$	153		$	17,386
Net income (loss)	—		—			756			—			(25		)	731
Other comprehensive income (loss), net of tax	—		—			—			93			—			93
Compensation—restricted stock units	—		(26		)	—			—			—			(26		)
Issuance of common stock	3		321			78			—			—			402
Other	1		—			—			—			(8		)	(7		)
Net change	4		295			834			93			(33		)	1,193
Balance, September 30, 2017	$	148	$	8,179		$	10,935		$	(803	)	$	120		$	18,579
Balance, December 31, 2017	$	148	$	8,197		$	10,936		$	(1,026	)	$	100		$	18,355
Net income (loss)	—		—			816			—			(20		)	796
Other comprehensive income (loss), net of tax	—		—			—			(308		)	—			(308		)
Compensation—restricted stock units	—		(18		)	(3		)	—			—			(21		)
Other (1)	—		(21		)	—			21			—			—
Net change	—		(39		)	813			(287		)	(20		)	467
Balance, September 30, 2018	$	148	$	8,158		$	11,749		$	(1,313	)	$	80		$	18,822

(1) For additional information on other, see Note 10 "Accumulated Other Comprehensive Income".

See accompanying Notes to Consolidated Financial Statements.

43

MUFG Americas Holdings Corporation and Subsidiaries

Consolidated Statements of Cash Flows

(Unaudited)

	For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017
Cash Flows from Operating Activities:
Net income including noncontrolling interests	$	796		$	731
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Reversal of) provision for credit losses	43			(34		)
Depreciation, amortization and accretion, net	297			265
Stock-based compensation—restricted stock units	58			49
Deferred income taxes	(119		)	138
Net gains on sales of securities	(4		)	(15		)
Net decrease (increase) in securities borrowed or purchased under resale agreements	(371		)	(2,144		)
Net decrease (increase) in securities loaned or sold under repurchase agreements	594			2,691
Net decrease (increase) in trading account assets	(646		)	(1,281		)
Net decrease (increase) in other assets	(573		)	369
Net increase (decrease) in trading account liabilities	429			433
Net increase (decrease) in other liabilities	62			(331		)
Loans originated for sale	(1,215		)	(473		)
Net proceeds from sale of loans originated for sale	1,077			505
Pension and other benefits adjustment	(37		)	(156		)
Other, net	(20		)	12
Total adjustments	(425		)	28
Net cash provided by (used in) operating activities	371			759
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	853			1,953
Proceeds from paydowns and maturities of securities available for sale	2,252			1,836
Purchases of securities available for sale	(4,697		)	(7,195		)
Proceeds from paydowns and maturities of securities held to maturity	1,262			1,324
Purchases of securities held to maturity	(772		)	(1,235		)
Proceeds from sales of loans	563			751
Net decrease (increase) in loans	(3,735		)	(1,793		)
Purchases of other investments	(188		)	(131		)
Other, net	(59		)	(12		)
Net cash provided by (used in) investing activities	(4,521		)	(4,502		)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	3,017			(1,495		)
Net increase (decrease) in commercial paper and other short-term borrowings	1,241			3,630
Proceeds from issuance of long-term debt	4,058			4,122
Repayment of long-term debt	(3,367		)	(4,591		)
Other, net	(117		)	(76		)
Change in noncontrolling interests	—			(8		)
Net cash provided by (used in) financing activities	4,832			1,582
Net change in cash, cash equivalents and restricted cash	682			(2,161		)
Cash, cash equivalents and restricted cash at beginning of period	3,528			5,834
Cash, cash equivalents and restricted cash at end of period	$	4,210		$	3,673
Cash Paid During the Period For:
Interest	$	1,180		$	652
Income taxes, net	121			168
Supplemental Schedule of Noncash Investing and Financing Activities:
Net transfer of loans held for investment to (from) loans held for sale	$	10		$	833
Securities available for sale transferred to securities held to maturity	1,924			—
Transfer of assets and liabilities from MUFG Bank and MUFG:
Carrying amount of assets acquired	—			1,003
Carrying amount of liabilities assumed	—			601
Reconciliation of Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents	$	4,192		$	3,634
Restricted cash included in other assets	18			39
Total cash, cash equivalents and restricted cash per consolidated statement of cash flows	$	4,210		$	3,673

See accompanying Notes to Consolidated Financial Statements.

44

Notes to Consolidated Financial Statements

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

MUFG Americas Holdings Corporation (MUAH) is a financial holding company, bank holding company and intermediate holding company whose principal subsidiaries are MUFG Union Bank, N.A. (MUB or the Bank) and MUFG Securities Americas Inc. (MUSA). MUAH provides a wide range of financial services to consumers, small businesses, middle-market companies and major corporations nationally and internationally. The Company also provides various business, banking, financial, administrative and support services, and facilities for MUFG Bank, Ltd. (formerly The Bank of Tokyo-Mitsubishi UFJ, Ltd.) in connection with the operation and administration of MUFG Bank, Ltd.'s business in the U.S. (including MUFG Bank, Ltd.'s U.S. branches). All of the Company's issued and outstanding shares of common stock are owned by MUFG Bank, Ltd. and MUFG. The unaudited Consolidated Financial Statements of MUFG Americas Holdings Corporation, its subsidiaries, and its consolidated variable interest entities (the Company) have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial reporting and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Rules and Regulations of the SEC. However, they do not include all of the disclosures necessary for annual financial statements. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation have been included. The results of operations for the third quarter of 2018 are not necessarily indicative of the operating results anticipated for the full year. These unaudited Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 (2017 Form 10-K).

The preparation of financial statements in conformity with 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. Critical estimates made by management in the preparation of the Company’s financial statements include, but are not limited to, the allowance for credit losses (Note 3 "Loans and Allowance for Loan Losses"), goodwill impairment, fair value of financial instruments (Note 8 "Fair Value Measurement and Fair Value of Financial Instruments"), pension accounting (Note 11 "Employee Pension and Other Postretirement Benefits"), income taxes, and transfer pricing.

During the first quarter of 2018, the Company refined its methodology for estimating the allowance for commercial loans collectively evaluated for impairment and the allowance for losses on unfunded credit commitments. Previously the Company derived the allowance for these loans by assigning a loss factor based on an internal risk rating that estimated the probability that a credit facility may ultimately default (i.e. probability of default). The refinement implemented during the first quarter of 2018 utilizes a dual factor internal risk rating system that encompasses both the probability of default and an estimate of the severity of the loss that would be realized upon such default (i.e. the loss-given default). During the second quarter of 2018, the Company implemented refinements to the qualitative considerations used in our reserve methodology.     

Recently Issued Accounting Pronouncements

Accounting for Leases

In February 2016, the FASB issued ASU 2016-02, Leases, which will require entities that lease assets (i.e., lessees) to recognize assets and liabilities on their balance sheet for the rights and obligations created by those leases. The accounting by entities that own the assets leased (i.e., lessors) will remain largely unchanged; however, leveraged lease accounting will no longer be permitted for leases that commence after the effective date. The ASU will also require qualitative and quantitative disclosures about the amount, timing and uncertainty of cash flows arising from leases. The ASU is effective for interim and annual periods beginning on January 1, 2019 and requires a modified retrospective approach, with early adoption permitted. In July 2018, the FASB issued ASU 2018-11, Leases, which allows entities the option to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company plans to adopt the ASU on January 1, 2019. The Company is in the technology testing phase of this project to support the ongoing lessee accounting

45

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

required under the ASU. Management is currently assessing the impact of this guidance on the Company's financial position and results of operations.

Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments, which provides new guidance on the accounting for credit losses for instruments that are within its scope. This new guidance is commonly referred to as the current expected credit loss (“CECL”) model. For loans and debt securities accounted for at amortized cost, certain off-balance sheet credit exposures, net investments in leases, and trade receivables, the ASU requires an entity to recognize its estimate of credit losses expected over the life of the financial instrument or exposure. Lifetime expected credit losses on purchased financial assets with credit deterioration will be recognized as an allowance with an offset to the cost basis of the asset. For available for sale debt securities, the new standard will require recognition of expected credit losses by recognizing an allowance for credit losses when the fair value of the security is below amortized cost and the recognition of this allowance is limited to the difference between the security’s amortized cost basis and fair value. The ASU is effective for interim and annual periods beginning on January 1, 2020, with early adoption permitted in 2019. The Company plans to adopt the ASU on January 1, 2020. The Company is in the design phase of the implementation. Management is currently assessing the impact of this guidance on the Company’s financial position and results of operations.

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment. The ASU removes Step 2 of the goodwill impairment test, which measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. Under the amendments, a goodwill impairment loss will be measured as the amount by which a reporting unit’s carrying amount exceeds its fair value; however, the loss recognized cannot exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss. The ASU will be effective for MUAH beginning January 1, 2020 on a prospective basis. Early adoption is permitted for any impairment tests performed after January 1, 2017. Management does not expect the adoption of this guidance to significantly impact the Company’s financial position or results of operations.

Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities, which requires premiums on certain purchased callable debt securities to be amortized to the earliest call date. Under current guidance, premiums on callable debt securities are generally amortized over the contractual life of the security. The amortization period for callable debt securities purchased at a discount will not be impacted. The ASU is effective for interim and annual periods beginning on January 1, 2019 and requires a modified retrospective approach, 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.

Targeted Improvements to Accounting for Hedging Activities

In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities, which will make more hedging strategies eligible for hedge accounting, simplify the application of hedge accounting, and enhance the transparency and understandability of hedge results. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. It also amends the disclosure requirements and changes how entities assess effectiveness. The guidance will be effective for MUAH beginning January 1, 2019, with early adoption permitted. If the guidance is early adopted in an interim period, any adjustments would be reflected as of the beginning of the fiscal year that includes that interim period. Management is currently assessing the impact of this guidance on the Company’s financial position and results of operations.

46

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

Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement

In August 2018, the FASB issued ASU 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement, which modifies disclosure requirements on fair value measurements to improve their effectiveness. The guidance permits entities to consider materiality when evaluating fair value measurement disclosures and, among other modifications, requires certain new disclosures related to Level 3 fair value measurements. The guidance will be effective for MUAH beginning January 1, 2020, with early adoption permitted. The guidance only affects disclosures in the notes to the consolidated financial statements and will not affect the Company’s financial position or results of operations.

Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued ASU 2018-14, Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans, which modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans to improve the effectiveness of the disclosures. The guidance includes new requirements to disclose the weighted-average interest crediting rate for cash balance plans and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation. The guidance is effective for years ending after December 15, 2020, with early adoption permitted. This guidance only affects disclosures in the notes to the consolidated financial statements and will not affect the Company’s financial position or results of operations.

Recently Adopted Accounting Pronouncements

Revenue from Contracts with Customers

Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, which provides guidance on the core principle that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU applies to all contracts with customers, except financial instruments, guarantees, lease contracts, insurance contracts and certain non-monetary exchanges. This guidance did not significantly affect the Company's financial position and results of operations. As a result of adopting this guidance, the Company's accounting policies have been updated as summarized below.

Revenues from Contracts with Customers

Revenues from contracts with customers include service charges on deposit accounts, trust and investment management fees, brokerage commissions and fees, card processing fees, net, investment banking and syndication fees, and fees from affiliates. The Company recognizes revenue from contracts with customers according to a five-step revenue recognition model: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the entity satisfies a performance obligation. The Company’s contracts with customers generally contain a single performance obligation or separately identified performance obligations, each with a stated transaction price and generally do not involve a significant timing difference between satisfaction of the performance obligation and customer payment. Revenues are recognized over time or at a point in time as the performance obligations are satisfied. Certain revenues, primarily included within brokerage commissions and fees, are variable. However, recognition of these variable revenues does not involve significant estimates or constraints.

47

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

Principal versus Agent Considerations (Reporting Revenue Gross versus Net)

Effective January 1, 2018, the Company adopted ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net). The ASU amends ASU 2014-09, Revenue from Contracts with Customers, with respect to assessing whether an entity is a principal (and thus presents revenue gross) or an agent (and thus presents revenue net). The amendments retain the guidance that the principal in an arrangement controls a good or service before it is transferred to a customer and clarify: (1) that an entity must first identify the specified good or service being provided to the customer; (2) that the unit of account for the principal versus agent assessment is each specified good or service promised in a contract; (3) indicators and examples to help an entity evaluate whether it is the principal; and (4) how to assess whether an entity controls services performed by another party. As a result of adopting ASU 2016-08, beginning January 1, 2018, certain expenses that were previously presented as a reduction of related fees from affiliates and investment banking and syndication fees are presented in noninterest expense.

Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost

Effective January 1, 2018, the Company adopted ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which amended the income statement presentation of the components of net periodic benefit cost for sponsored defined benefit pension and other postretirement plans. As a result of adopting ASU 2017-07, the salaries and employee benefits expense and other expense categories in noninterest expense have been adjusted to reflect adoption of this guidance as follows.

	For the Three Months Ended							For the Nine Months Ended
	September 30, 2017							September 30, 2017
(Dollars in millions)	As Previously Reported		Adjustment			As Reported under New Guidance		As Previously Reported		Adjustment			As Reported under New Guidance
Salaries and employee benefits	$	589	$	32		$	621	$	1,790	$	91		$	1,881
Other	126		(32		)	94		358		(91		)	267

48

Note 2—Securities

Securities Available for Sale

At September 30, 2018 and December 31, 2017, the amortized cost, gross unrealized gains, gross unrealized losses and fair values of securities available for sale are presented below.

	September 30, 2018
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset Liability Management securities:
U.S. Treasury	$	3,964	$	—	$	234	$	3,730
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	8,739		2		240		8,501
Privately issued	891		—		30		861
Privately issued - commercial mortgage-backed securities	1,109		—		31		1,078
Collateralized loan obligations	1,434		1		1		1,434
Other	4		—		—		4
Asset Liability Management securities	16,141		3		536		15,608
Other debt securities:
Direct bank purchase bonds	1,292		28		39		1,281
Other	188		1		1		188
Total securities available for sale	$	17,621	$	32	$	576	$	17,077

	December 31, 2017
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset Liability Management securities:
U.S. Treasury	$	3,370	$	—	$	118	$	3,252
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	9,338		2		132		9,208
Privately issued	695		3		4		694
Privately issued - commercial mortgage-backed securities	823		4		5		822
Collateralized loan obligations	1,895		10		—		1,905
Other	5		—		—		5
Asset Liability Management securities	16,126		19		259		15,886
Other debt securities:
Direct bank purchase bonds	1,495		38		30		1,503
Other	163		1		—		164
Equity securities	10		—		—		10
Total securities available for sale	$	17,794	$	58	$	289	$	17,563

49

Note 2—Securities (Continued)

The Company’s securities available for sale with a continuous unrealized loss position at September 30, 2018 and December 31, 2017 are shown below, identified for periods less than 12 months and 12 months or more.

	September 30, 2018
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Asset Liability Management securities:
U.S. Treasury	$	869	$	20	$	2,813	$	214	$	3,682	$	234
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	3,996		71		3,572		169		7,568		240
Privately issued	642		19		193		11		835		30
Privately issued - commercial mortgage-backed securities	679		17		299		14		978		31
Collateralized loan obligations	606		1		—		—		606		1
Asset Liability Management securities	6,792		128		6,877		408		13,669		536
Other debt securities:
Direct bank purchase bonds	307		10		393		29		700		39
Other	109		1		—		—		109		1
Total securities available for sale	$	7,208	$	139	$	7,270	$	437	$	14,478	$	576

	December 31, 2017
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Asset Liability Management securities:
U.S. Treasury	$	1,074	$	14	$	2,128	$	104	$	3,202	$	118
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	3,606		22		4,651		110		8,257		132
Privately issued	275		1		164		3		439		4
Privately issued - commercial mortgage-backed securities	447		3		80		2		527		5
Collateralized loan obligations	12		—		—		—		12		—
Asset Liability Management securities	5,414		40		7,023		219		12,437		259
Other debt securities:
Direct bank purchase bonds	58		4		563		26		621		30
Other	79		—		—		—		79		—
Equity securities	10		—		—		—		10		—
Total securities available for sale	$	5,561	$	44	$	7,586	$	245	$	13,147	$	289

At September 30, 2018, 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, such as Ginnie Mae, or a government-sponsored agency such as Freddie Mac or Fannie 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 from changes in credit quality. At September 30, 2018, 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.

50

Note 2—Securities (Continued)

Commercial mortgage-backed securities are collateralized by commercial mortgage loans and are generally subject to prepayment penalties. The unrealized losses on commercial mortgage-backed securities resulted from higher market yields since purchase. 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 September 30, 2018, the Company expects to recover the entire amortized cost basis of these securities.

The Company’s CLOs consist of Cash Flow CLOs. A Cash Flow CLO is a structured finance product that securitizes a diversified pool of loan assets into multiple classes of notes. Cash Flow CLOs pay the note holders through the receipt of interest and principal repayments from the underlying loans unlike other types of CLOs that pay note holders through the trading and sale of underlying collateral. Unrealized losses typically arise from widening credit spreads and deteriorating credit quality of the underlying collateral. Cash flow analysis of the underlying collateral provides an estimate of other-than-temporary impairment, which is performed quarterly when the fair value of a security is lower than its amortized cost. Based on the analysis performed as of September 30, 2018, 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 estimates the unrealized loss 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 September 30, 2018, 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.

	September 30, 2018
(Dollars in millions)	One Year or Less		Over One Year Through Five Years		Over Five Years Through Ten Years		Over Ten Years		Total Fair Value
Asset Liability Management securities:
U.S. Treasury	$	—	$	1,163	$	2,567	$	—	$	3,730
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	—		266		1,354		6,881		8,501
Privately issued	—		—		—		861		861
Privately issued - commercial mortgage-backed securities	—		—		42		1,036		1,078
Collateralized loan obligations	—		2		389		1,043		1,434
Other	1		3		—		—		4
Asset Liability Management securities	1		1,434		4,352		9,821		15,608
Other debt securities:
Direct bank purchase bonds	112		301		741		127		1,281
Other	—		169		—		19		188
Total debt securities available for sale	$	113	$	1,904	$	5,093	$	9,967	$	17,077

51

Note 2—Securities (Continued)

The gross realized gains and losses from sales of available for sale securities for the three and nine months endedSeptember 30, 2018 and 2017 are shown below. The specific identification method is used to calculate realized gains and losses on sales.

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Dollars in millions)	2018		2017		2018		2017
Gross realized gains	$	1	$	6	$	4	$	15

Securities Held to Maturity

At September 30, 2018 and December 31, 2017, the amortized cost, gross unrealized gains and losses recognized in OCI, carrying amount, gross unrealized gains and losses not recognized in OCI, and fair values of securities held to maturity are presented below. Management has asserted the positive intent and ability to hold these securities to maturity.

	September 30, 2018
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury	$	527	$	—	$	—	$	527	$	2	$	3	$	526
U.S. government-sponsored agencies	772		—		—		772		—		1		771
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	8,651		2		101		8,552		3		337		8,218
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	1,514		—		45		1,469		8		20		1,457
Total securities held to maturity	$	11,464	$	2	$	146	$	11,320	$	13	$	361	$	10,972

	December 31, 2017
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury	$	525	$	—	$	—	$	525	$	3	$	1	$	527
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	7,870		2		31		7,841		15		130		7,726
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	1,571		—		52		1,519		36		9		1,546
Total securities held to maturity	$	9,966	$	2	$	83	$	9,885	$	54	$	140	$	9,799

Amortized cost is defined as the original purchase cost, adjusted for any accretion or amortization of a purchase discount or premium, less principal payments and any impairment previously recognized in earnings. The carrying amount is the difference between the amortized cost and the amount recognized in OCI. The amount recognized in OCI primarily reflects the unrealized gain or loss at date of transfer from available for sale to the held to maturity classification, net of amortization, which is recorded in interest income on securities.

52

Note 2—Securities (Continued)

The Company’s securities held to maturity with a continuous unrealized loss position at September 30, 2018 and December 31, 2017 are shown below, separately for periods less than 12 months and 12 months or more.

	September 30, 2018
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
U.S. Treasury	$	494	$	—	$	3	$	—	$	—	$	—	$	494	$	—	$	3
U.S. government-sponsored agencies	720		—		1		—		—		—		720		—		1
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	2,753		28		73		5,300		73		264		8,053		101		337
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	46		—		1		1,411		45		19		1,457		45		20
Total securities held to maturity	$	4,013	$	28	$	78	$	6,711	$	118	$	283	$	10,724	$	146	$	361

	December 31, 2017
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
U.S. Treasury	$	494	$	—	$	1	$	—	$	—	$	—	$	494	$	—	$	1
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	2,649		—		31		4,000		31		99		6,649		31		130
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	19		—		—		1,496		52		9		1,515		52		9
Total securities held to maturity	$	3,162	$	—	$	32	$	5,496	$	83	$	108	$	8,658	$	83	$	140

53

Note 2—Securities (Continued)

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.

					September 30, 2018
	Within One Year				Over One Year Through Five Years				Over Five Years Through Ten Years				Over Ten Years				Total
(Dollars in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
U.S. Treasury	$	518	$	516	$	9	$	10	$	—	$	—	$	—	$	—	$	527	$	526
U.S. government-sponsored agencies	—		—		—		—		772		771		—		—		772		771
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	—		—		—		—		1,058		1,022		7,494		7,196		8,552		8,218
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	48		49		794		796		—		—		627		612		1,469		1,457
Total securities held to maturity	$	566	$	565	$	803	$	806	$	1,830	$	1,793	$	8,121	$	7,808	$	11,320	$	10,972

Securities Pledged and Received as Collateral

At September 30, 2018 and December 31, 2017, the Company pledged $12.7 billion and $12.3 billion of available for sale and trading securities as collateral, respectively, of which $1.6 billion and $1.2 billion, respectively, was permitted to be sold or repledged. These securities were pledged as collateral for derivative liability positions, securities loaned or sold under repurchase agreements, short-term borrowings and to secure public and trust department deposits.

At September 30, 2018 and December 31, 2017, the Company received $29.3 billion and $31.8 billion, respectively, of collateral, of which $29.3 billion and $31.8 billion, respectively, was permitted to be sold or repledged. Of the collateral received, the Company sold or repledged $28.3 billion and $30.4 billion at September 30, 2018 and December 31, 2017, respectively, for derivative asset positions and securities borrowed or purchased under resale agreements.

For additional information related to the Company's significant accounting policies on securities pledged as collateral, see Note 1 "Summary of Significant Accounting Policies and Nature of Operations" to our Consolidated Financial Statements in Part II, Item 8. "Financial Statements and Supplementary Data" in our 2017 Form 10-K.

54

Note 3—Loans and Allowance for Loan Losses

The following table provides the outstanding balances of loans held for investment at September 30, 2018 and December 31, 2017.

(Dollars in millions)	September 30, 2018			December 31, 2017
Loans held for investment:
Commercial and industrial	$	23,349		$	23,281
Commercial mortgage	15,031			14,320
Construction	1,480			1,775
Lease financing	1,417			1,533
Total commercial portfolio	41,277			40,909
Residential mortgage	38,059			35,643
Home equity and other consumer loans	4,317			3,462
Total consumer portfolio	42,376			39,105
Total loans held for investment(1)	83,653			80,014
Allowance for loan losses	(501		)	(476		)
Loans held for investment, net	$	83,152		$	79,538

(1) Includes $338 million and $301 million at September 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.

55

Note 3—Loans and Allowance for Loan Losses (Continued)

Allowance for Loan Losses

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

	For the Three Months Ended September 30, 2018
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	362		$	78		$	5	$	445
(Reversal of) provision for loan losses	33			24			5		62
Loans charged-off	(8		)	(8		)	—		(16		)
Recoveries of loans previously charged-off	8			2			—		10
Allowance for loan losses, end of period	$	395		$	96		$	10	$	501

	For the Three Months Ended September 30, 2017
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	435		$	78		$	—	$	513
(Reversal of) provision for loan losses	(7		)	10			30		33
Other	2			—			—		2
Loans charged-off	(7		)	(10		)	—		(17		)
Recoveries of loans previously charged-off	8			3			—		11
Allowance for loan losses, end of period	$	431		$	81		$	30	$	542

	For the Nine Months Ended September 30, 2018
(Dollars in millions)	Commercial			Consumer			Unallocated			Total
Allowance for loan losses, beginning of period	$	360		$	86		$	30		$	476
(Reversal of) provision for loan losses	32			32			(20		)	44
Loans charged-off	(15		)	(27		)	—			(42		)
Recoveries of loans previously charged-off	18			5			—			23
Allowance for loan losses, end of period	$	395		$	96		$	10		$	501

	For the Nine Months Ended September 30, 2017
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	556		$	83		$	—	$	639
(Reversal of) provision for loan losses	(57		)	26			30		(1		)
Other	2			—			—		2
Loans charged-off	(91		)	(32		)	—		(123		)
Recoveries of loans previously charged-off	21			4			—		25
Allowance for loan losses, end of period	$	431		$	81		$	30	$	542

56

Note 3—Loans and Allowance for Loan Losses (Continued)

The following tables show the allowance for loan losses and related loan balances by portfolio segment as of September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Commercial		Consumer		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	116	$	13	$	—	$	129
Collectively evaluated for impairment	279		83		10		372
Total allowance for loan losses	$	395	$	96	$	10	$	501
Loans held for investment:
Individually evaluated for impairment	$	497	$	289	$	—	$	786
Collectively evaluated for impairment	40,780		42,087		—		82,867
Total loans held for investment	$	41,277	$	42,376	$	—	$	83,653

	December 31, 2017
(Dollars in millions)	Commercial		Consumer		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	58	$	15	$	—	$	73
Collectively evaluated for impairment	302		71		30		403
Total allowance for loan losses	$	360	$	86	$	30	$	476
Loans held for investment:
Individually evaluated for impairment	$	544	$	321	$	—	$	865
Collectively evaluated for impairment	40,365		38,784		—		79,149
Total loans held for investment	$	40,909	$	39,105	$	—	$	80,014

Nonaccrual and Past Due Loans

The following table presents nonaccrual loans as of September 30, 2018 and December 31, 2017.

(Dollars in millions)	September 30, 2018		December 31, 2017
Commercial and industrial	$	268	$	319
Commercial mortgage	12		20
Total commercial portfolio	280		339
Residential mortgage	111		104
Home equity and other consumer loans	20		22
Total consumer portfolio	131		126
Total nonaccrual loans	$	411	$	465
Troubled debt restructured loans that continue to accrue interest	$	354	$	348
Troubled debt restructured nonaccrual loans (included in total nonaccrual loans above)	$	252	$	229

57

Note 3—Loans and Allowance for Loan Losses (Continued)

The following tables show the aging of the balance of loans held for investment by class as of September 30, 2018 and December 31, 2017.

	September 30, 2018
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	24,634	$	31	$	101	$	132	$	24,766
Commercial mortgage	14,989		38		4		42		15,031
Construction	1,480		—		—		—		1,480
Total commercial portfolio	41,103		69		105		174		41,277
Residential mortgage	37,855		166		38		204		38,059
Home equity and other consumer loans	4,284		22		11		33		4,317
Total consumer portfolio	42,139		188		49		237		42,376
Total loans held for investment	$	83,242	$	257	$	154	$	411	$	83,653

	December 31, 2017
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	24,734	$	17	$	63	$	80	$	24,814
Commercial mortgage	14,298		16		6		22		14,320
Construction	1,775		—		—		—		1,775
Total commercial portfolio	40,807		33		69		102		40,909
Residential mortgage	35,453		151		39		190		35,643
Home equity and other consumer loans	3,427		23		12		35		3,462
Total consumer portfolio	38,880		174		51		225		39,105
Total loans held for investment	$	79,687	$	207	$	120	$	327	$	80,014

Loans 90 days or more past due and still accruing totaled $11 million at September 30, 2018 and $12 million at December 31, 2017.

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 have regulatory risk ratings of special mention, substandard or doubtful; classified credits are those that have regulatory risk ratings of 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. 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.

58

Note 3—Loans and Allowance for Loan Losses (Continued)

The following tables summarize the loans in the commercial portfolio segment monitored for credit quality based on regulatory risk ratings.

	September 30, 2018
			Criticized
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	23,602	$	404	$	760	$	24,766
Commercial mortgage	14,769		100		162		15,031
Construction	1,398		4		78		1,480
Total commercial portfolio	$	39,769	$	508	$	1,000	$	41,277

	December 31, 2017
			Criticized
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	23,632	$	435	$	747	$	24,814
Commercial mortgage	14,081		80		159		14,320
Construction	1,632		15		128		1,775
Total commercial portfolio	$	39,345	$	530	$	1,034	$	40,909

The Company monitors the credit quality of its consumer portfolio segment based primarily on payment status. The following tables summarize the loans in the consumer portfolio segment, which exclude $6 million and $8 million of loans covered by FDIC loss share agreements, at September 30, 2018 and December 31, 2017, respectively.

	September 30, 2018
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	37,944	$	111	$	38,055
Home equity and other consumer loans	4,295		20		4,315
Total consumer portfolio	$	42,239	$	131	$	42,370

	December 31, 2017
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	35,534	$	104	$	35,638
Home equity and other consumer loans	3,437		22		3,459
Total consumer portfolio	$	38,971	$	126	$	39,097

The Company also monitors the credit quality for substantially all of its consumer portfolio segment using credit scores provided by FICO and refreshed 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 data available for the property location. 

The following tables summarize the loans in the consumer portfolio segment based on refreshed FICO scores and refreshed LTV ratios at September 30, 2018 and December 31, 2017. These tables exclude loans covered by FDIC loss share agreements, as discussed above. The amounts presented reflect unpaid principal balances less partial charge-offs.

59

Note 3—Loans and Allowance for Loan Losses (Continued)

	September 30, 2018
	FICO scores
(Dollars in millions)	720 and Above			Below 720			No FICO Available(1)			Total
Residential mortgage	$	31,284		$	5,939		$	445		$	37,668
Home equity and other consumer loans	3,001			1,200			55			4,256
Total consumer portfolio	$	34,285		$	7,139		$	500		$	41,924
Percentage of total	82		%	17		%	1		%	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, 2017
	FICO scores
(Dollars in millions)	720 and Above			Below 720			No FICO Available(1)			Total
Residential mortgage	$	28,786		$	6,082		$	411		$	35,279
Home equity and other consumer loans	2,404			918			84			3,406
Total consumer portfolio	$	31,190		$	7,000		$	495		$	38,685
Percentage of total	81		%	18		%	1		%	100		%

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

	September 30, 2018
	LTV ratios
(Dollars in millions)	Less than or Equal to 80 Percent			Greater than 80 and Less than 100 Percent			Greater than or Equal to 100 Percent			No LTV Available(1)			Total
Residential mortgage	$	36,985		$	654		$	4		$	25		$	37,668
Home equity loans	1,979			215			12			28			2,234
Total consumer portfolio	$	38,964		$	869		$	16		$	53		$	39,902
Percentage of total	98		%	2		%	—		%	—		%	100		%

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

	December 31, 2017
	LTV ratios
(Dollars in millions)	Less than or Equal to 80 Percent			Greater than 80 and Less than 100 Percent			Greater than or Equal to 100 Percent			No LTV Available(1)			Total
Residential mortgage	$	34,472		$	771		$	4		$	32		$	35,279
Home equity loans	2,052			248			24			33			2,357
Total consumer portfolio	$	36,524		$	1,019		$	28		$	65		$	37,636
Percentage of total	97		%	3		%	—		%	—		%	100		%

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

60

Note 3—Loans and Allowance for Loan Losses (Continued)

Troubled Debt Restructurings

The following table provides a summary of the Company’s recorded investment in TDRs as of September 30, 2018 and December 31, 2017. The summary includes those TDRs that are on nonaccrual status and those that continue to accrue interest. The Company had $39 million and $66 million in commitments to lend additional funds to borrowers with loan modifications classified as TDRs as of September 30, 2018 and December 31, 2017, respectively.

(Dollars in millions)	September 30, 2018		December 31, 2017
Commercial and industrial	$	253	$	202
Commercial mortgage	53		7
Construction	78		128
Total commercial portfolio	384		337
Residential mortgage	200		215
Home equity and other consumer loans	22		25
Total consumer portfolio	222		240
Total restructured loans	$	606	$	577

For the third quarter of 2018, TDR modifications in the commercial portfolio segment were substantially composed of interest rate changes, maturity extensions, forbearance, conversions from revolving lines of credit to term loans, or some combination thereof. In the consumer portfolio segment, modifications were primarily composed of maturity extensions. Charge-offs related to TDR modifications for the nine months ended September 30, 2018 and September 30, 2017 were de minimis. For the commercial and consumer portfolio segments, the allowance for loan losses for TDRs was measured on an individual loan basis or in pools with similar risk characteristics.

61

Note 3—Loans and Allowance for Loan Losses (Continued)

The following tables provide the pre- and post-modification outstanding recorded investment amounts of TDRs as of the date of the restructuring that occurred during the three and nine months ended September 30, 2018 and 2017.

	For the Three Months Ended September 30, 2018				For the Nine Months Ended September 30, 2018
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)		Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	59	$	59	$	163	$	163
Total commercial portfolio	59		59		163		163
Residential mortgage	4		4		6		6
Home equity and other consumer loans	1		1		2		2
Total consumer portfolio	5		5		8		8
Total	$	64	$	64	$	171	$	171

(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.

	For the Three Months Ended September 30, 2017				For the Nine Months Ended September 30, 2017
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)		Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	20	$	20	$	116	$	116
Commercial mortgage	2		2		3		3
Construction	—		—		61		61
Total commercial portfolio	22		22		180		180
Residential mortgage	6		6		14		14
Home equity and other consumer loans	—		—		2		2
Total consumer portfolio	6		6		16		16
Total	$	28	$	28	$	196	$	196

(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.

62

Note 3—Loans and Allowance for Loan Losses (Continued)

The following tables provide the recorded investment amounts of TDRs at the date of default, for which there was a payment default during the three and nine months ended September 30, 2018 and 2017, and where the default occurred within the first twelve months after modification into a TDR. A payment default is defined as the loan being 60 days or more past due.

(Dollars in millions)	For the Three Months Ended September 30, 2018		For the Nine Months Ended September 30, 2018
Residential mortgage	$	—	$	2
Total consumer portfolio	—		2
Total	$	—	$	2

(Dollars in millions)	For the Three Months Ended September 30, 2017		For the Nine Months Ended September 30, 2017
Commercial and industrial	$	—	$	19
Commercial mortgage	—		1
Total commercial portfolio	—		20
Residential mortgage	1		2
Total consumer portfolio	1		2
Total	$	1	$	22

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

Loan Impairment

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

The following tables show information about impaired loans by class as of September 30, 2018 and December 31, 2017.

	September 30, 2018
	Recorded Investment								Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total		Allowance for Impaired Loans		With an Allowance		Without an Allowance
Commercial and industrial	$	321	$	22	$	343	$	112	$	372	$	91
Commercial mortgage	24		53		77		—		24		53
Construction	70		7		77		4		70		7
Total commercial portfolio	415		82		497		116		466		151
Residential mortgage	180		73		253		13		190		87
Home equity and other consumer loans	23		13		36		—		23		22
Total consumer portfolio	203		86		289		13		213		109
Total	$	618	$	168	$	786	$	129	$	679	$	260

63

Note 3—Loans and Allowance for Loan Losses (Continued)

	December 31, 2017
	Recorded Investment								Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total		Allowance for Impaired Loans		With an Allowance		Without an Allowance
Commercial and industrial	$	287	$	93	$	380	$	57	$	348	$	102
Commercial mortgage	33		3		36		1		33		3
Construction	—		128		128		—		—		128
Total commercial portfolio	320		224		544		58		381		233
Residential mortgage	218		59		277		15		234		69
Home equity and other consumer loans	29		15		44		—		30		24
Total consumer portfolio	247		74		321		15		264		93
Total	$	567	$	298	$	865	$	73	$	645	$	326

The following table presents the average recorded investment in impaired loans and the amount of interest income recognized for impaired loans during the three and nine months ended September 30, 2018 and 2017 for the commercial and consumer loans portfolio segments.

	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2018				2017				2018				2017
(Dollars in millions)	Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income
Commercial and industrial	$	329	$	3	$	397	$	4	$	306	$	8	$	466	$	15
Commercial mortgage	79		5		96		11		56		23		94		33
Construction	78		3		9		2		106		7		12		3
Total commercial portfolio	486		11		502		17		468		38		572		51
Residential mortgage	257		3		305		3		264		10		310		10
Home equity and other consumer loans	36		—		53		1		39		2		55		5
Total consumer portfolio	293		3		358		4		303		12		365		15
Total	$	779	$	14	$	860	$	21	$	771	$	50	$	937	$	66

The following table presents loan transfers from held to investment to held for sale and proceeds from

sales of loans during the three and nine months ended September 30, 2018 and 2017 for the commercial and consumer loans portfolio segments.

	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2018				2017				2018				2017
(Dollars in millions)	Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale			Proceeds from Sale
Commercial portfolio	$	77	$	49	$	477	$	105	$	10	$	563	$	837		$	751
Consumer portfolio	—		—		—		—		—		—		(4		)	—
Total	$	77	$	49	$	477	$	105	$	10	$	563	$	833		$	751

64

Note 4—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 sheets at September 30, 2018 and December 31, 2017.

	September 30, 2018
	Consolidated Assets								Consolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities
LIHC investments	$	—	$	—	$	48	$	48	$	—	$	—
Leasing investments	—		569		140		709		14		14
Total consolidated VIEs	$	—	$	569	$	188	$	757	$	14	$	14

	December 31, 2017
	Consolidated Assets								Consolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities
LIHC investments	$	—	$	—	$	68	$	68	$	—	$	—
Leasing investments	1		583		158		742		24		24
Total consolidated VIEs	$	1	$	583	$	226	$	810	$	24	$	24

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 the 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 energy, 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 investments.

65

Note 4—Variable Interest Entities (Continued)

Unconsolidated VIEs

The following tables present the Company’s carrying amounts related to the unconsolidated VIEs at September 30, 2018 and December 31, 2017. The tables also present 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. During the nine months endedSeptember 30, 2018 and September 30, 2017, the Company had noncash increases in unfunded commitments on LIHC investments of $45 million and $22 million, respectively, included within other liabilities.

	September 30, 2018
	Unconsolidated Assets										Unconsolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Securities Available for Sale		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	—	$	28	$	236	$	971	$	1,235	$	176	$	176	$	1,235
Leasing investments	30		—		21		1,453		1,504		44		44		1,525
Other investments	—		—		5		34		39		—		—		80
Total unconsolidated VIEs	$	30	$	28	$	262	$	2,458	$	2,778	$	220	$	220	$	2,840

	December 31, 2017
	Unconsolidated Assets										Unconsolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Securities Available for Sale		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	—	$	29	$	228	$	1,028	$	1,285	$	254	$	254	$	1,284
Leasing investments	1		—		24		1,745		1,770		53		53		1,792
Other investments	—		—		24		26		50		—		—		132
Total unconsolidated VIEs	$	1	$	29	$	276	$	2,799	$	3,105	$	307	$	307	$	3,208

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 or partnerships, and therefore is not considered the primary beneficiary and does not consolidate these investments.

The following table presents the impact of the unconsolidated LIHC investments on our consolidated statements of income for the three and nine months endedSeptember 30, 2018 and 2017.

	For the Three Months Ended				For the Nine Months Ended
	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
(Dollars in millions)
Losses from LIHC investments included in other noninterest expense	$	2	$	4	$	6	$	8
Amortization of LIHC investments included in income tax expense	34		37		102		106
Tax credits and other tax benefits from LIHC investments included in income tax expense	39		49		130		141

66

Note 4—Variable Interest Entities (Continued)

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 third party sponsors. 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 significant activities of the LLCs, and therefore is not considered the primary beneficiary and does not consolidate these investments.

Other Investments

The Company has other 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 investments.

Note 5—Securities Financing Arrangements

The Company enters into securities purchased under agreements to resell, securities sold under agreements to repurchase, securities borrowed and securities loaned transactions. The Company executes these transactions to facilitate customer match-book activity, cover short positions and fund the Company's trading inventory. The Company manages credit exposure from certain transactions by entering into master netting agreements and collateral arrangements with counterparties. The relevant agreements allow for the efficient closeout of the transaction, liquidation and set-off of collateral against the net amount owed by the counterparty following a default. Under these agreements and transactions, the Company either receives or provides collateral. The Company receives collateral in the form of securities in connection with reverse repurchase agreements and securities borrowed transactions. In many cases, the Company is permitted to sell or repledge these securities held as collateral and use the securities to secure repurchase agreements or enter into securities lending transactions. In certain cases the Company may agree for collateral to be posted to a third party custodian under a tri-party arrangement that enables the Company to take control of such collateral in the event of a counterparty default. Default events generally include, among other things, failure to pay, insolvency or bankruptcy of a counterparty. For additional information related to securities pledged and received as collateral, see Note 2 "Securities".

The following tables present the gross obligations for securities sold under agreements to repurchase and securities loaned by remaining contractual maturity and class of collateral pledged at September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Overnight and Continuous		Up to 30 Days		31 - 90 Days		Greater than 90 Days		Total
Securities sold under agreements to repurchase:
U.S. Treasury securities	$	12,283	$	648	$	313	$	250	$	13,494
U.S. government-sponsored agency securities	119		166		16		—		301
Money market securities	—		—		289		—		289
Asset-backed securities	—		—		242		—		242
Mortgage-backed securities	8,808		2,325		6,709		1,150		18,992
Corporate bonds	1,346		131		813		—		2,290
State and municipal securities	44		66		394		—		504
Equity securities	249		3		274		—		526
Total	$	22,849	$	3,339	$	9,050	$	1,400	$	36,638
Securities loaned:
U.S. Treasury securities	$	—	$	170	$	41	$	—	$	211
Equity securities	285		—		—		—		285
Total	$	285	$	170	$	41	$	—	$	496

67

Note 5—Securities Financing Arrangements (Continued)

	December 31, 2017
(Dollars in millions)	Overnight and Continuous		Up to 30 Days		31 - 90 Days		Greater than 90 Days		Total
Securities sold under agreements to repurchase:
U.S. Treasury securities	$	8,244	$	2,370	$	1,046	$	1,158	$	12,818
U.S. government-sponsored agency securities	115		38		63		—		216
Other sovereign government obligations	—		—		4		—		4
Money market securities	1		—		6		—		7
Asset-backed securities	32		—		164		—		196
Mortgage-backed securities	8,322		4,972		5,859		250		19,403
Corporate bonds	580		620		1,125		—		2,325
State and municipal securities	283		—		276		—		559
Equity securities	416		376		189		—		981
Total	$	17,993	$	8,376	$	8,732	$	1,408	$	36,509
Securities loaned:
Corporate bonds	$	—	$	322	$	—	$	—	$	322
Equity securities	446		10		101		—		557
Total	$	446	$	332	$	101	$	—	$	879

Offsetting Financial Assets and Liabilities

The Company primarily enters into derivative contracts, repurchase agreements and securities lending agreements with counterparties utilizing standard International Swaps and Derivatives Association Master Agreements and Credit Support Annex Agreements, Master Repurchase Agreements, and Master Securities Lending Agreements, respectively. These agreements 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 at September 30, 2018 and December 31, 2017.

	September 30, 2018
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative assets	$	772	$	306	$	466	$	18	$	—	$	448
Securities borrowed or purchased under resale agreements	31,367		10,102		21,265		21,179		—		86
Total	$	32,139	$	10,408	$	21,731	$	21,197	$	—	$	534
Financial Liabilities:
Derivative liabilities	$	863	$	309	$	554	$	50	$	—	$	504
Securities loaned or sold under repurchase agreements	37,134		10,102		27,032		26,250		—		782
Total	$	37,997	$	10,411	$	27,586	$	26,300	$	—	$	1,286

68

Note 5—Securities Financing Arrangements (Continued)

	December 31, 2017
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative assets	$	1,322	$	607	$	715	$	25	$	—	$	690
Securities borrowed or purchased under resale agreements	31,845		10,951		20,894		20,816		—		78
Total	$	33,167	$	11,558	$	21,609	$	20,841	$	—	$	768
Financial Liabilities:
Derivative liabilities	$	1,127	$	620	$	507	$	142	$	—	$	365
Securities loaned or sold under repurchase agreements	37,388		10,951		26,437		25,639		—		798
Total	$	38,515	$	11,571	$	26,944	$	25,781	$	—	$	1,163

Note 6—Commercial Paper and Other Short-Term Borrowings

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

(Dollars in millions)	September 30, 2018		December 31, 2017
Debt issued by MUB
Commercial paper, with a weighted average interest rate of 2.08% and 1.26% at September 30, 2018 and December 31, 2017, respectively	$	293	$	347
Federal Home Loan Bank advances, with a weighted average interest rate of 2.22% and 1.42% at September 30, 2018 and December 31, 2017, respectively	7,000		5,750
Total debt issued by MUB	7,293		6,097
Debt issued by other MUAH subsidiaries
Short-term debt due to MUFG Bank, Ltd., with weighted average interest rates of 2.67% and 1.88% at September 30, 2018 and December 31, 2017, respectively	150		168
Short-term debt due to affiliates, with weighted average interest rates of (-0.07)% and (-0.09)% at September 30, 2018 and December 31, 2017, respectively	866		801
Total debt issued by other MUAH subsidiaries	1,016		969
Total commercial paper and other short-term borrowings	$	8,309	$	7,066

Short-term debt due to MUFG Bank, Ltd. consists of both secured and unsecured fixed and floating rate borrowings.

MUSA maintains an uncommitted, unsecured lending facility with Mitsubishi UFJ Securities Holdings Co., Ltd. under which it may borrow up to JPY 160 billion (USD 1.4 billion equivalent). Under the terms of the facility, MUSA can choose to borrow in Japanese Yen or U.S. Dollars. Japanese Yen denominated borrowings include an extension option allowing MUSA to extend the maturity of an individual draw by 100 days at any time prior to its original, stated maturity. At September 30, 2018, MUSA had JPY 98 billion (USD 866 million equivalent) drawn under this facility.

69

Note 7—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)	September 30, 2018		December 31, 2017
Debt issued by MUAH
Senior debt:
Floating rate senior notes due February 2018. These notes, which bore interest at 0.57% above 3-month LIBOR, had a rate of 1.97% at December 31, 2017	$	—	$	250
Fixed rate 1.625% notes due February 2018	—		450
Fixed rate 2.25% notes due February 2020	999		998
Fixed rate 3.50% notes due June 2022	398		398
Fixed rate 3.00% notes due February 2025	496		496
Senior debt due to MUFG Bank, Ltd:
Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 3.19% at September 30, 2018 and 2.45% at December 31, 2017	545		545
Floating rate debt due September 2020. This note, which bears interest at 0.85% above 3-month LIBOR, had a rate of 3.18% at September 30, 2018 and 2.54% at December 31, 2017	3,500		3,500
Floating rate debt due December 2023. This note, which bears interest at 0.76% above 3-month EURIBOR, had a rate of .76% at September 30, 2018 and 0.76% at December 31, 2017	24		24
Subordinated debt due to MUFG Bank, Ltd:
Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 3.71% at September 30, 2018 and 3.07% at December 31, 2017	300		300
Junior subordinated debt payable to trusts:
Floating rate note due September 2036. This note had an interest rate of 4.03% at September 30, 2018 and 3.29% at December 31, 2017	36		36
Total debt issued by MUAH	6,298		6,997
Debt issued by MUB
Senior debt:
Fixed rate 2.63% notes due September 2018	—		1,000
Fixed rate 2.25% notes due May 2019	497		497
Fixed rate FHLB of San Francisco advances due between October 2018 and June 2020. These notes bear a combined weighted average rate of 2.12% at September 30, 2018 and 1.51% at December 31, 2017	4,900		1,500
Subordinated debt due to MUFG Bank, Ltd:
Floating rate subordinated debt due June 2023. This note, which bore interest at 1.20% above 3-month LIBOR, had a rate of 2.89% at December 31, 2017	—		750
Other	28		63
Total debt issued by MUB	5,425		3,810
Debt issued by other MUAH subsidiaries
Senior debt due to MUFG Bank, Ltd:
Various floating rate borrowings due between December 2020 and May 2021. These notes, which bear interest above 3-month LIBOR had a weighted average interest rate of 2.39% at September 30, 2018 and 1.78% at December 31, 2017	250		291
Various fixed rate borrowings due between February 2019 and May 2024 with a weighted average interest rate of 1.82% (between 0.14% and 2.44%) at September 30, 2018 and 2.12% (between 1.37% and 2.65%) at December 31, 2017	264		339
Subordinated debt due to Affiliate:
Various floating rate borrowings due between September 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had an interest rate of 4.13% at September 30, 2018 and 2.95% (between 2.88% and 3.04%) at December 31, 2017	75		185

70

Note 7—Long Term Debt (Continued)

Non-recourse debt due to MUFG Bank, Ltd:
Various floating rate non-recourse borrowings due between November 2018 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.83% (between 3.49% and 4.48%) at September 30, 2018 and 3.07% (between 1.49% and 5.58%) at December 31, 2017	77		79
Fixed rate non-recourse borrowings due between January 2019 and July 2023 which had an interest rate of 3.06% at September 30, 2018 and 3.27% at December 31, 2017	195		240
Other non-recourse debt:
Various floating rate non-recourse borrowings due between February 2019 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.64% (between 3.34% and 4.23%) at September 30, 2018 and 2.88% (between 2.50% and 3.54%) at December 31, 2017	178		185
Fixed rate non-recourse borrowings due December 2026 which had an interest rate of 5.34% at September 30, 2018 and December 31, 2017	34		36
Total debt issued by other MUAH subsidiaries	1,073		1,355
Total long-term debt	$	12,796	$	12,162

Note 8—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 assets and liabilities. For additional information related to the valuation methodologies used for certain financial assets and financial liabilities measured at fair value, and information about the Company's valuation processes, see Note 11 "Fair Value Measurement and Fair Value of Financial Instruments" to our Consolidated Financial Statements in Part II, Item 8. “Financial Statements and Supplementary Data” in our 2017 Form 10-K.

Fair Value Hierarchy

In determining fair value, the Company maximizes the use of observable market inputs and minimizes the use of unobservable inputs. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect the Company’s estimate about market data. Based on the observability of the significant inputs used, the Company classifies its fair value measurements in accordance with the three-level hierarchy as defined by GAAP. This hierarchy is based on the quality, observability and reliability of the information used to determine fair value. 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. For additional information related to the fair value hierarchy, see Note 11 "Fair Value Measurement and Fair Value of Financial Instruments" to our Consolidated Financial Statements in Part II, Item 8. “Financial Statements and Supplementary Data” in our 2017 Form 10-K.

71

Note 8—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

Fair Value Measurements on a Recurring Basis

The following tables present financial assets and financial liabilities measured at fair value on a recurring basis at September 30, 2018 and December 31, 2017, by major category and by valuation hierarchy level.

	September 30, 2018
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets(2):
U.S. Treasury securities	$	—		$	2,968		$	—		$	—		$	2,968
U.S. government-sponsored agency securities	—			115			—			—			115
State and municipal securities	—			11			—			—			11
Commercial paper	—			335			—			—			335
Corporate bonds	—			1,428			—			—			1,428
Asset-backed securities	—			262			—			—			262
Mortgage-backed securities	—			5,511			—			—			5,511
Equities	122			—			—			—			122
Interest rate derivative contracts	32			422			—			(121		)	333
Commodity derivative contracts	—			42			—			(28		)	14
Foreign exchange derivative contracts	1			226			—			(117		)	110
Equity derivative contracts	1			—			43			(40		)	4
Total trading account assets	156			11,320			43			(306		)	11,213
Securities available for sale(3):
Asset Liability Management securities:
U.S. Treasury	—			3,730			—			—			3,730
Residential mortgage-backed securities:
U.S government and government-sponsored agencies	—			8,501			—			—			8,501
Privately issued	—			861			—			—			861
Privately issued - commercial mortgage-backed securities	—			1,078			—			—			1,078
Collateralized loan obligations	—			1,434			—			—			1,434
Other	—			4			—			—			4
Other debt securities:
Direct bank purchase bonds	—			—			1,281			—			1,281
Other	—			44			144			—			188
Total securities available for sale	—			15,652			1,425			—			17,077
Other assets:
Mortgage servicing rights(2)	—			—			176			—			176
Interest rate hedging contracts(3)	—			4			—			—			4
Other derivative contracts(2)	—			1			—			—			1
Equity securities(2)	9			—			—			—			9
Total other assets	9			5			176			—			190
Total assets	$	165		$	26,977		$	1,644		$	(306	)	$	28,480
Percentage of total	—		%	95		%	6		%	(1		)%	100		%
Percentage of total Company assets	—			17			1			—			18
Liabilities
Trading account liabilities(2):
Securities sold, not yet purchased:
U.S. Treasury	$	—		$	2,518		$	—		$	—		$	2,518
Commercial paper	—			22			—			—			22
Corporate bonds	—			853			—			—			853
Equities	88			—			—			—			88
Trading derivatives:
Interest rate derivative contracts	3			627			—			(217		)	413
Commodity derivative contracts	—			33			—			(24		)	9
Foreign exchange derivative contracts	1			127			—			(49		)	79
Equity derivative contracts	4			—			43			—			47
Total trading account liabilities	96			4,180			43			(290		)	4,029
Other liabilities:
FDIC clawback liability(2)	—			—			115			—			115
Other derivative contracts(2)	—			21			4			(19		)	6
Total other liabilities	—			21			119			(19		)	121
Total liabilities	$	96		$	4,201		$	162		$	(309	)	$	4,150
Percentage of total	2		%	101		%	4		%	(7		)%	100		%
Percentage of total Company liabilities	—			3			—			—			3

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

(2) Fair value through net income.

(3) Fair value through other comprehensive income.

72

Note 8—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

	December 31, 2017
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets(2):
U.S. Treasury securities	$	—		$	1,926		$	—		$	—		$	1,926
U.S. government-sponsored agency securities	—			118			—			—			118
State and municipal securities	—			11			—			—			11
Commercial paper	—			7			—			—			7
Other sovereign government obligations	—			8			—			—			8
Corporate bonds	—			1,054			—			—			1,054
Asset-backed securities	—			199			—			—			199
Mortgage-backed securities	—			6,339			—			—			6,339
Equities	193			—			—			—			193
Interest rate derivative contracts	7			870			1			(353		)	525
Commodity derivative contracts	—			50			—			(49		)	1
Foreign exchange derivative contracts	—			249			1			(68		)	182
Equity derivative contracts	2			—			137			(135		)	4
Total trading account assets	202			10,831			139			(605		)	10,567
Securities available for sale(3):
Asset Liability Management securities:
U.S. Treasury	—			3,252			—			—			3,252
Residential mortgage-backed securities:
U.S government and government-sponsored agencies	—			9,208			—			—			9,208
Privately issued	—			694			—			—			694
Privately issued - commercial mortgage-backed securities	—			822			—			—			822
Collateralized loan obligations	—			1,905			—			—			1,905
Other	—			5			—			—			5
Other debt securities:
Direct bank purchase bonds	—			—			1,503			—			1,503
Other	—			68			96			—			164
Equity securities	10			—			—			—			10
Total securities available for sale	10			15,954			1,599			—			17,563
Other assets:
Mortgage servicing rights(2)	—			—			64			—			64
Interest rate hedging contracts(3)	—			2			—			—			2
Other derivative contracts(2)	—			2			1			(2		)	1
Total other assets	—			4			65			(2		)	67
Total assets	$	212		$	26,789		$	1,803		$	(607	)	$	28,197
Percentage of total	1		%	95		%	6		%	(2		)%	100		%
Percentage of total Company assets	—			17			1			—			18
Liabilities
Trading account liabilities(2):
Securities sold, not yet purchased:
U.S. Treasury	$	—		$	2,709		$	—		$	—		$	2,709
Other sovereign government obligations	—			7			—			—			7
Corporate bonds	—			348			—			—			348
Equities	35			—			—			—			35
Trading derivatives:
Interest rate derivative contracts	3			643			—			(382		)	264
Commodity derivative contracts	—			33			—			(20		)	13
Foreign exchange derivative contracts	1			144			1			(66		)	80
Equity derivative contracts	7			—			137			—			144
Total trading account liabilities	46			3,884			138			(468		)	3,600
Other liabilities:
FDIC clawback liability(2)	—			—			113			—			113
Interest rate hedging contracts(3)	—			149			—			(149		)	—
Other derivative contracts(2)	—			3			6			(3		)	6
Total other liabilities	—			152			119			(152		)	119
Total liabilities	$	46		$	4,036		$	257		$	(620	)	$	3,719
Percentage of total	1		%	109		%	7		%	(17		)%	100		%
Percentage of total Company liabilities	—			3			—			—			3

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

(2) Fair value through net income.

(3) Fair value through other comprehensive income.

73

Note 8—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

The following tables present a reconciliation of the assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2018 and 2017. Level 3 available for sale securities at September 30, 2018 and 2017 primarily consist of direct bank purchase bonds.

	For the Three Months Ended
	September 30, 2018														September 30, 2017
(Dollars in millions)	Trading Account Assets			Securities Available for Sale			Other Assets		Trading Account Liabilities			Other Liabilities			Trading Account Assets			Securities Available for Sale			Other Assets			Trading Account Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	50		$	1,495		$	149	$	(49	)	$	(119	)	$	171		$	1,572		$	49		$	(169	)	$	(118	)
Total gains (losses) - realized/unrealized:
Included in income before taxes	6			—			2		(7		)	—			17			—			(1		)	(17		)	(1		)
Included in other comprehensive income	—			(1		)	—		—			—			—			3			—			—			—
Purchases/additions	—			52			25		—			—			—			4			9			—			—
Settlements	(13		)	(121		)	—		13			—			(24		)	(10		)	—			24			—
Asset (liability) balance, end of period	$	43		$	1,425		$	176	$	(43	)	$	(119	)	$	164		$	1,569		$	57		$	(162	)	$	(119	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	6		$	—		$	2	$	(7	)	$	—		$	17		$	—		$	(1	)	$	(17	)	$	(1	)

74

Note 8—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

	For the Nine Months Ended
	September 30, 2018														September 30, 2017
(Dollars in millions)	Trading Account Assets			Securities Available for Sale			Other Assets		Trading Account Liabilities			Other Liabilities			Trading Account Assets			Securities Available for Sale			Other Assets			Trading Account Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	139		$	1,600		$	65	$	(138	)	$	(119	)	$	168		$	1,638		$	24		$	(166	)	$	(121	)
Total gains (losses) - realized/unrealized):
Included in income before taxes	—			—			11		(1		)	—			58			—			(3		)	(57		)	2
Included in other comprehensive income	—			(18		)	—		—			—			—			15			—			—			—
Purchases/additions	—			125			100		—			—			—			6			36			—			—
Settlements	(96		)	(282		)	—		96			—			(62		)	(90		)	—			61			—
Asset (liability) balance, end of period	$	43		$	1,425		$	176	$	(43	)	$	(119	)	$	164		$	1,569		$	57		$	(162	)	$	(119	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	—		$	—		$	11	$	(1	)	$	—		$	58		$	—		$	(3	)	$	(57	)	$	2

The following table presents information about significant unobservable inputs related to the Company’s significant Level 3 assets and liabilities at September 30, 2018.

	September 30, 2018
(Dollars in millions)	Level 3 Fair Value		Valuation Technique	Significant Unobservable Input(s)	Range of Inputs		Weighted Average
Securities available for sale:
Direct bank purchase bonds	$	1,281	Return on equity	Market-required return on capital	8.0 - 10.0	%	9.5	%
				Probability of default	0.0 - 25.0		0.3
				Loss severity	10.0 - 60.0		24.3

The direct bank purchase bonds generally 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.

75

Note 8—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

Fair Value Measurement on a Nonrecurring Basis

Certain assets may be measured at fair value in certain situations, such as impairment, and these measurements are referred to as nonrecurring. For assets measured at fair value on a nonrecurring basis during the three and nine months ended September 30, 2018 and 2017 that were still held on the consolidated balance sheet as of the respective periods ended, the following tables present the fair value of such assets by the level of valuation assumptions used to determine each fair value adjustment.

	September 30, 2018								For the Three Months Ended September 30, 2018			For the Nine Months Ended September 30, 2018
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3		Gains (Losses)			Gains (Losses)
Loans held for investment
Impaired loans	$	183	$	—	$	—	$	183	$	(59	)	$	(73	)
Other assets
Software	—		—		—		—		(1		)	(3		)
Private equity investments	10		—		—		10		—			(2		)
Renewable energy investment	2		—		—		2		—			(2		)
Consolidated LIHC VIE	48		—		—		48		—			(8		)
Total	$	243	$	—	$	—	$	243	$	(60	)	$	(88	)

	September 30, 2017								For the Three Months Ended September 30, 2017			For the Nine Months Ended September 30, 2017
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3		Gains (Losses)			Gains (Losses)
Loans held for investment
Impaired loans	$	97	$	—	$	—	$	97	$	(21	)	$	(42	)
Other assets
Software	—		—		—		—		(1		)	(4		)
Loans held for sale	7		—		—		7		(1		)	(3		)
Renewable energy investment	—		—		—		—		—			2
Consolidated LIHC VIE	81		—		—		81		(3		)	(11		)
Total	$	185	$	—	$	—	$	185	$	(26	)	$	(58	)

76

Note 8—Fair Value Measurement and Fair Value of Financial Instruments (Continued)

Fair Value of Financial Instruments Disclosures

The tables below present the carrying amount and estimated fair value of certain financial instruments, all of which are accounted for at amortized cost, classified by valuation hierarchy level at September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	4,192	$	4,192	$	4,192	$	—	$	—
Securities borrowed or purchased under resale agreements	21,265		21,262		—		21,262		—
Securities held to maturity	11,320		10,972		—		10,972		—
Loans held for investment(1)	81,765		81,445		—		—		81,445
Other assets	18		18		18		—		—
Liabilities
Time deposits	$	9,957	$	9,899	$	—	$	9,899	$	—
Securities loaned or sold under repurchase agreements	27,032		27,030		—		27,030		—
Commercial paper and other short-term borrowings	8,309		8,309		—		8,309		—
Long-term debt	12,796		12,764		—		12,764		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	102	$	230	$	—	$	—	$	230

(1) Excludes lease financing. The carrying amount is net of the allowance for loan losses.

	December 31, 2017
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	3,392	$	3,392	$	3,392	$	—	$	—
Securities borrowed or purchased under resale agreements	20,894		20,894		—		20,894		—
Securities held to maturity	9,885		9,799		—		9,799		—
Loans held for investment(1)	78,023		79,051		—		—		79,051
Liabilities
Deposits	$	84,787	$	84,743	$	—	$	84,743	$	—
Securities loaned or sold under repurchase agreements	26,437		26,437		—		26,437		—
Commercial paper and other short-term borrowings	7,066		7,066		—		7,066		—
Long-term debt	12,162		12,162		—		12,162		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	174	$	174	$	—	$	—	$	174

(1) Excludes lease financing. The carrying amount is net of the allowance for loan losses.

77

Note 9—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. 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 credit support annex agreements. Additionally, the Company considers counterparty credit quality and the creditworthiness of the Company in estimating the fair value of derivative instruments.

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 as hedging instruments at September 30, 2018 and December 31, 2017. Asset and liability values are presented gross, excluding the impact of legally enforceable master netting and credit support annex 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.

	September 30, 2018						December 31, 2017
			Fair Value						Fair Value
(Dollars in millions)	Notional Amount		Asset Derivatives		Liability Derivatives		Notional Amount		Asset Derivatives		Liability Derivatives
Derivative instruments
Cash flow hedges:
Interest rate contracts	$	179	$	4	$	—	$	6,998	$	2	$	149
Fair value hedges:
Interest rate contracts	—		—		—		500		—		—
Not designated as hedging instruments:
Trading:
Interest rate contracts	120,613		454		630		132,214		878		646
Commodity contracts	453		42		33		1,244		50		33
Foreign exchange contracts	8,099		227		128		7,053		250		146
Equity contracts	503		44		47		1,496		139		144
Other contracts	39		—		—		4		—		—
Total Trading	129,707		767		838		142,011		1,317		969
Other risk management	1,232		1		25		1,345		3		9
Total derivative instruments	$	131,118	$	772	$	863	$	150,854	$	1,322	$	1,127

We recognized net losses of $28 million and $26 million on other risk management derivatives for the three and nine months ended September 30, 2018, respectively, and net losses of $3 million and $9 million for the three and nine months ended September 30, 2017, 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 and debt issuances. Derivatives that qualify for hedge accounting are designated as either fair value or cash flow hedges.

78

Note 9—Derivative Instruments and Other Financial Instruments Used For Hedging (Continued)

Cash Flow Hedges

From time to time, the Company uses interest rate swaps to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed loans, and to a lesser extent, to hedge interest rate risk on rollover debt. 

The Company used interest rate swaps with an aggregate notional amount of $179 million at September 30, 2018 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed short-term borrowings. At September 30, 2018, the weighted average remaining life of the active cash flow hedges was 1.9 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 noninterest expense in the period in which they arise. At September 30, 2018, the Company expects to reclassify approximately $81 million of losses from AOCI as a reduction to net interest income during the twelve months ending September 30, 2019. This amount could differ from amounts actually realized due to changes in interest rates, hedge terminations and the addition of other hedges subsequent to September 30, 2018.

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 stockholders' equity for derivatives designated as cash flow hedges for the three and nine months ended September 30, 2018 and 2017.

	Gains (Losses) Recognized in OCI (Effective Portion)					Gains (Losses) Reclassified from AOCI into Income (Effective Portion)						(Gains) Losses Recognized in Income (Ineffective Portion)
	For the Three Months Ended September 30,					For the Three Months Ended September 30,						For the Three Months Ended September 30,
(Dollars in millions)	2018		2017		Location	2018			2017		Location	2018		2017
Derivatives in cash flow hedging relationships
					Interest income	$	(11	)	$	11
Interest rate contracts	$	—	$	6	Interest expense	—			—		Noninterest expense	$	—	$	—
Total	$	—	$	6		$	(11	)	$	11		$	—	$	—

	Gains (Losses) Recognized in OCI (Effective Portion)						Gains (Losses) Reclassified from AOCI into Income (Effective Portion)						Gains (Losses) Recognized in Income (Ineffective Portion)
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017		Location	2018			2017		Location	2018			2017
Derivatives in cash flow hedging relationships
						Interest income	$	(19	)	$	60
Interest rate contracts	$	(98	)	$	42	Interest expense	—			—		Noninterest expense	$	(1	)	$	3
Total	$	(98	)	$	42		$	(19	)	$	60		$	(1	)	$	3

Fair Value Hedges

The Company engages in an interest rate hedging strategy in which one or more interest rate swaps are associated with a specified interest bearing liability, in order to convert the liability from a fixed rate to a floating rate instrument. This strategy mitigates the changes in fair value of the hedged liability caused by changes in the designated benchmark interest rate, LIBOR.

79

Note 9—Derivative Instruments and Other Financial Instruments Used For Hedging (Continued)

For fair value hedges, any ineffectiveness is recognized in noninterest expense in the period in which it arises. The change in the fair value of the hedged item and the hedging instrument, to the extent completely effective, offset with no impact on earnings.

The following tables present the gains (losses) on the Company's fair value hedges and hedged item for the three and nine months ended September 30, 2018 and 2017.

	For the Three Months Ended September 30, 2018						For the Nine Months Ended September 30, 2018
(Dollars in millions)	Derivative		Hedged Item		Hedge Ineffectiveness		Derivative			Hedged Item		Hedge Ineffectiveness
Interest rate risk on long-term debt	$	—	$	—	$	—	$	(2	)	$	2	$	—
Total	$	—	$	—	$	—	$	(2	)	$	2	$	—

	For the Three Months Ended September 30, 2017							For the Nine Months Ended September 30, 2017
(Dollars in millions)	Derivative			Hedged Item		Hedge Ineffectiveness		Derivative			Hedged Item		Hedge Ineffectiveness
Interest rate risk on long-term debt	$	(1	)	$	1	$	—	$	(2	)	$	1	$	(1	)
Total	$	(1	)	$	1	$	—	$	(2	)	$	1	$	(1	)

Derivatives Not Designated as Hedging Instruments

Trading Derivatives

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

The following table presents the amount of the net gains and losses for derivative instruments classified as trading reported in the consolidated statements of income under the heading trading account activities for the three and nine months ended September 30, 2018 and 2017.

	Gains (Losses) Recognized in Income on Trading Derivatives					Gains (Losses) Recognized in Income on Trading Derivatives
	For the Three Months Ended					For the Nine Months Ended
(Dollars in millions)	September 30, 2018		September 30, 2017			September 30, 2018		September 30, 2017
Trading derivatives
Interest rate contracts	$	64	$	(11	)	$	194	$	(69	)
Equity contracts	5		—			23		—
Foreign exchange contracts	11		11			32		32
Commodity contracts	—		—			—		1
Total	$	80	$	—		$	249	$	(36	)

Offsetting Financial Assets and Liabilities

The Company primarily enters into derivative contracts with counterparties utilizing standard International Swaps and Derivatives Association Master Agreements and Credit Support Annex Agreements. These agreements 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. For additional information related to offsetting of financial assets and liabilities, see Note 5 "Securities Financing Arrangements".

80

Note 10—Accumulated Other Comprehensive Income

The following tables present the change in each of the components of accumulated other comprehensive income and the related tax effect of the change allocated to each component for the three and nine months endedSeptember 30, 2018 and 2017.

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended September 30, 2018
Cash flow hedge activities:
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	$	11		$	(3	)	$	8
Net change	11			(3		)	8
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	(70		)	19			(51		)
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(1		)	—			(1		)
Amortization of net unrealized (gains) losses on held to maturity securities	8			(2		)	6
Net change	(63		)	17			(46		)
Pension and other benefits:
Amortization of prior service credit(1)	(10		)	2			(8		)
Recognized net actuarial (gain) loss(1)	24			(6		)	18
Net change	14			(4		)	10
Net change in AOCI	$	(38	)	$	10		$	(28	)

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended September 30, 2017
Cash flow hedge activities:
Unrealized net gains (losses) on hedges arising during the period	$	6		$	(2	)	$	4
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	(11		)	4			(7		)
Net change	(5		)	2			(3		)
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	32			(14		)	18
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(6		)	2			(4		)
Less: accretion of fair value adjustment on securities available for sale	(1		)	—			(1		)
Amortization of net unrealized (gains) losses on held to maturity securities	6			(2		)	4
Net change	31			(14		)	17
Foreign currency translation adjustment	7			(3		)	4
Pension and other benefits:
Amortization of prior service credit(1)	(12		)	5			(7		)
Recognized net actuarial (gain) loss(1)	21			(7		)	14
Net change	9			(2		)	7
Other	1			—			1
Net change in AOCI	$	43		$	(17	)	$	26

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

81

Note 10—Accumulated Other Comprehensive Income (Continued)

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Nine Months Ended September 30, 2018
Cash flow hedge activities:
Unrealized net gains (losses) on hedges arising during the period	$	(98	)	$	26		$	(72	)
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	19			(5		)	14
Net change	(79		)	21			(58		)
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	(392		)	103			(289		)
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(4		)	1			(3		)
Amortization of net unrealized (gains) losses on held to maturity securities	20			(5		)	15
Net change	(376		)	99			(277		)
Foreign currency translation adjustment	(3		)	1			(2		)
Pension and other benefits:
Amortization of prior service credit(1)	(31		)	8			(23		)
Recognized net actuarial (gain) loss(1)	72			(19		)	53
Net change	41			(11		)	30
Other	(1		)	—			(1		)
Net change in AOCI	$	(418	)	$	110		$	(308	)

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Nine Months Ended September 30, 2017
Cash flow hedge activities:
Unrealized net gains (losses) on hedges arising during the period	$	42		$	(16	)	$	26
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	(60		)	23			(37		)
Net change	(18		)	7			(11		)
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	129			(52		)	77
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(15		)	6			(9		)
Less: accretion of fair value adjustment on securities available for sale	(1		)	—			(1		)
Amortization of net unrealized (gains) losses on held to maturity securities	15			(6		)	9
Net change	128			(52		)	76
Foreign currency translation adjustment	12			(5		)	7
Pension and other benefits:
Amortization of prior service credit (1)	(36		)	14			(22		)
Recognized net actuarial (gain) loss(1)	67			(25		)	42
Net change	31			(11		)	20
Other	1			—			1
Net change in AOCI	$	154		$	(61	)	$	93

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

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Note 10—Accumulated Other Comprehensive Income (Continued)

The following tables present the change in accumulated other comprehensive loss balances.

For the Three Months Ended September 30, 2017 and 2018:
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Postretirement Benefits Adjustment			Other			Accumulated Other Comprehensive Income (Loss)
(Dollars in millions)
Balance, June 30, 2017	$	(85	)	$	(149	)	$	(19	)	$	(576	)	$	—		$	(829	)
Other comprehensive income (loss) before reclassifications	4			18			4			—			—			26
Amounts reclassified from AOCI	(7		)	(1		)	—			7			1			—
Balance, September 30, 2017	$	(88	)	$	(132	)	$	(15	)	$	(569	)	$	1		$	(803	)
Balance, June 30, 2018	$	(240	)	$	(464	)	$	—		$	(580	)	$	(1	)	$	(1,285	)
Other comprehensive income (loss) before reclassifications	—			(51		)	—			—			—			(51		)
Amounts reclassified from AOCI	8			5			—			10			—			23
Balance, September 30, 2018	$	(232	)	$	(510	)	$	—		$	(570	)	$	(1	)	$	(1,313	)

For the Nine Months Ended September 30, 2017 and 2018:
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Postretirement Benefits Adjustment			Other			Accumulated Other Comprehensive Income (Loss)
(Dollars in millions)
Balance, December 31, 2016	$	(77	)	$	(208	)	$	(22	)	$	(589	)	$	—		$	(896	)
Other comprehensive income (loss) before reclassifications	26			77			7			—			—			110
Amounts reclassified from AOCI	(37		)	(1		)	—			20			1			(17		)
Balance, September 30, 2017	$	(88	)	$	(132	)	$	(15	)	$	(569	)	$	1		$	(803	)
Balance, December 31, 2017	$	(174	)	$	(233	)	$	(19	)	$	(600	)	$	—		$	(1,026	)
Other comprehensive income (loss) before reclassifications	(72		)	(289		)	(2		)	—			(1		)	(364		)
Amounts reclassified from AOCI	14			12			—			30			—			56
Transfer to additional paid-in capital(1)	—			—			21			—			—			21
Balance, September 30, 2018	$	(232	)	$	(510	)	$	—		$	(570	)	$	(1	)	$	(1,313	)

(1) Transfer of accumulated foreign currency translation to additional paid-in capital resulted from the transfer of the Company's investment in a Canadian entity to MUFG Bank, Ltd. during the first quarter of 2018.

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Note 11—Employee Pension and Other Postretirement Benefits

The following tables summarize the components of net periodic benefit cost for the three and nine months ended September 30, 2018 and 2017. The components of net periodic benefit cost other than the service cost component are included in other noninterest expense in the income statement.

	Pension Benefits						Other Postretirement Benefits						Superannuation, SERP and ESBP
	For the Three Months Ended   September 30,						For the Three Months Ended   September 30,						For the Three Months Ended   September 30,
(Dollars in millions)	2018			2017			2018			2017			2018		2017
Components of net periodic benefit cost:
Service cost	$	21		$	18		$	—		$	1		$	—	$	—
Interest cost	25			25			2			2			1		1
Expected return on plan assets	(67		)	(64		)	(6		)	(5		)	—		—
Amortization of prior service credit	(7		)	(7		)	(3		)	(5		)	—		—
Recognized net actuarial loss	21			19			2			2			1		—
Total net periodic benefit (income) cost	$	(7	)	$	(9	)	$	(5	)	$	(5	)	$	2	$	1

	Pension Benefits						Other Postretirement Benefits						Superannuation, SERP and ESBP
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017			2018			2017			2018		2017
Components of net periodic benefit cost:
Service cost	$	60		$	53		$	3		$	4		$	—	$	—
Interest cost	75			75			6			6			2		2
Expected return on plan assets	(201		)	(191		)	(16		)	(14		)	—		—
Amortization of prior service credit	(20		)	(20		)	(11		)	(16		)	—		—
Recognized net actuarial loss	65			59			4			6			3		2
Total net periodic benefit (income) cost	$	(21	)	$	(24	)	$	(14	)	$	(14	)	$	5	$	4

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Note 12—Commitments, Contingencies and Guarantees

The following table summarizes the Company's commitments.

(Dollars in millions)	September 30, 2018
Commitments to extend credit	$	34,125
Issued standby and commercial letters of credit	4,858
Commitments to enter into forward-starting resale agreements	1,300
Other commitments	493

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 are generally 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. The majority of these types of commitments have terms of 1 year or less. As of September 30, 2018, the carrying amount of the Company's standby and commercial letters of credit totaled $3 million. Estimated exposure to loss related to these commitments is covered by the allowance for losses on unfunded 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 collateralized financing activities, commitments to fund principal investments, other securities, and residual value guarantees.

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 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 September 30, 2018, there is no current exposure to loss under these contracts, and the maximum potential exposure to loss in the future was estimated at $35 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. 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, results of operations or liquidity.

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Note 13—Business Segments

The Company has four reportable segments: Regional Bank, U.S. Wholesale & Investment Banking, Transaction Banking, and MUSA. The Company uses various management accounting methodologies to measure the performance of its segments. Unlike 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 separate economic entities.

Methodologies that are applied to the measurement of segment profitability, which are enhanced from time to time, include a funds transfer pricing system, an activity-based costing methodology, other indirect costs and a methodology to allocate the provision for credit losses. In the second quarter of 2018, the Company began measuring the performance of its business segments by reporting revenues and expenses from products and services sold entirely within the business segment that manages the customer relationship. The Company previously applied a “market view” perspective in measuring the business segments, which reported revenues and expenses from products and services sold in both the business segment that provided the product and the business segment that managed the customer relationship. Prior period results have been revised to conform to the current period presentation.

The funds 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 between Corporate Treasury and the operating segments. A segment receives a credit from Corporate Treasury for its funding sources. Conversely, a segment is assigned a charge by Corporate Treasury to fund its assets. Certain indirect costs, such as operations and technology expense, are allocated to the segments based on an activity-based costing methodology. 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. During the normal course of business, the Company occasionally changes or updates its management accounting methodologies or organizational structure. Certain non-bank subsidiaries, including MUSA, are reported based on their GAAP results.

Regional Bank

The Regional Bank provides banking products and services to individuals, businesses, and trust customers through five lines of business.

Consumer Banking serves consumers and small businesses through 345 full-service branches, digital channels, call centers, ATMs and alliances with other financial institutions. Products and services include checking and deposit accounts; residential mortgage loans; consumer loans; home equity lines of credit; credit cards; bill and loan payment services; and merchant services.

Commercial Banking provides commercial and asset-based loans to clients across a wide range of industries with annual revenues up to $1 billion. Through partnerships with other areas of the Bank, Commercial Banking clients also have access to non-credit products and services including global treasury management, capital markets solutions, foreign exchange, interest rate risk and commodity risk management products and services.

Real Estate Industries serves professional real estate investors and developers with products such as construction loans, commercial mortgages, bridge financing and unsecured financing. Property types supported include apartment, office, retail, industrial and single-family residential on the West Coast and in select metropolitan areas across the country. Real Estate Industries also makes tax credit investments in affordable housing projects through its Community Development Finance unit. Through partnerships with other areas of the bank, Real Estate Industries clients also have access to non-credit products and services including global treasury management, capital markets solutions, foreign exchange, interest rate risk and commodity risk management products and services.

Wealth Markets serves corporate, institutional, non-profit and individual clients. Capabilities include Wealth Planning / Trust & Estate Services; Investment Management through HighMark Capital Management, Inc., an SEC-registered investment advisory firm wholly-owned by the bank; Brokerage through UnionBanc

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Note 13—Business Segments (Continued)

Investment Services, LLC, an SEC-registered broker-dealer/investment advisory firm wholly-owned by the bank; and Private Wealth Management.

PurePoint Financial serves consumers through a national deposit platform offering savings accounts and CD products to customers through an online platform with services provided through a call center and a network of financial centers in New York, Florida, Illinois and Texas.

U.S. Wholesale & Investment Banking

U.S. Wholesale & Investment Banking delivers the full suite of MUAH products and services to large and mid-corporate customers. 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 and Nonprofit, Public Finance, and Financial Institutions (predominantly Insurance and Asset Managers). U.S. Wholesale & Investment Banking provides customers general corporate credit and structured credit services, including project finance, leasing and equipment finance, commercial finance, funds finance and securitizations. By working with the Company's other segments, U.S. Wholesale & Investment Banking offers its customers a range of noncredit services, which include global treasury management, capital market solutions, and various foreign exchange, 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. The client base consists of financial institutions, corporations, government agencies, insurance companies, mutual funds, investment managers and non-profit organizations.

MUFG Securities Americas

MUSA is MUAH's broker-dealer subsidiary which engages in capital markets origination transactions, private placements, collateralized financings, securities borrowing and lending transactions, and domestic and foreign debt and equity securities transactions.

Other

"Other" includes the MUFG Fund Services segment, Markets segment, Japanese Corporate Banking segment and Corporate Treasury. MUFG Fund Services provides comprehensive investment fund administrative solutions. Markets provides risk management solutions, including foreign exchange, interest rate and energy risk management solutions. The Japanese 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. 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 Part I, Item 3. “Quantitative and Qualitative Disclosures About Market Risk” in this Form 10-Q.

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; fees from affiliates and noninterest expenses associated with MUFG Bank, Ltd. U.S. branch banking operations; 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 FDIC covered assets.

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Note 13—Business Segments (Continued)

As of and for the Three Months Ended September 30, 2018:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	553	$	104		$	66		$	52	$	57		$	832
Noninterest income	111		103			15			94		303			626
Total revenue	664		207			81			146		360			1,458
Noninterest expense	518		106			65			121		249			1,059
(Reversal of) provision for credit losses	45		27			(3		)	—		(5		)	64
Income (loss) before income taxes and including noncontrolling interests	101		74			19			25		116			335
Income tax expense (benefit) (1)	17		(3		)	5			6		10			35
Net income (loss) including noncontrolling interests	84		77			14			19		106			300
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		6			6
Net income (loss) attributable to MUAH	$	84	$	77		$	14		$	19	$	112		$	306
Total assets, end of period	$	71,501	$	19,467		$	882		$	33,366	$	35,820		$	161,036

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

As of and for the Three Months Ended September 30, 2017:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other		MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	516	$	107		$	64		$	62	$	67	$	816
Noninterest income	108		91			19			100		197		515
Total revenue	624		198			83			162		264		1,331
Noninterest expense	487		98			56			119		222		982
(Reversal of) provision for credit losses	19		(9		)	(1		)	—		9		18
Income (loss) before income taxes and including noncontrolling interests	118		109			28			43		33		331
Income tax expense (benefit) (1)	31		19			11			18		30		109
Net income (loss) including noncontrolling interests	87		90			17			25		3		222
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		10		10
Net income (loss) attributable to MUAH	$	87	$	90		$	17		$	25	$	13	$	232
Total assets, end of period	$	66,025	$	20,813		$	1,042		$	32,538	$	34,434	$	154,852

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

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Note 13—Business Segments (Continued)

As of and for the Nine Months Ended September 30, 2018:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking		Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	1,620	$	307	$	197		$	157	$	201		$	2,482
Noninterest income	338		283		44			259		680			1,604
Total revenue	1,958		590		241			416		881			4,086
Noninterest expense	1,552		310		186			353		825			3,226
(Reversal of) provision for loan losses	52		3		(4		)	—		(8		)	43
Income (loss) before income taxes and including noncontrolling interests	354		277		59			63		64			817
Income tax expense (benefit) (1)	68		133		16			15		(211		)	21
Net income (loss) including noncontrolling interests	286		144		43			48		275			796
Deduct: net (income) loss from noncontrolling interests	—		—		—			—		20			20
Net income (loss) attributable to MUAH	$	286	$	144	$	43		$	48	$	295		$	816
Total assets, end of period	$	71,501	$	19,467	$	882		$	33,366	$	35,820		$	161,036

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

As of and for the Nine Months Ended September 30, 2017:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	1,527	$	333		$	179		$	178	$	188		$	2,405
Noninterest income	326		296			48			272		550			1,492
Total revenue	1,853		629			227			450		738			3,897
Noninterest expense	1,483		298			171			336		657			2,945
(Reversal of) provision for loan losses	39		(51		)	(1		)	—		(21		)	(34		)
Income (loss) before income taxes and including noncontrolling interests	331		382			57			114		102			986
Income tax expense (benefit) (1)	87		89			23			45		11			255
Net income (loss) including noncontrolling interests	244		293			34			69		91			731
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		25			25
Net income (loss) attributable to MUAH	$	244	$	293		$	34		$	69	$	116		$	756
Total assets, end of period	$	66,025	$	20,813		$	1,042		$	32,538	$	34,434		$	154,852

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

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PART II. OTHER INFORMATION

Item 1.   Legal Proceedings

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

Item 1A.   Risk Factors

For a discussion of risk factors relating to our business, please refer to Part I, Item 1A. "Risk Factors" in our 2017 Form 10-K, which is incorporated by reference herein, in addition to the following information.

Industry Factors

The effects of changes or increases in, or supervisory enforcement of, banking, securities, competition, or other laws and regulations or governmental fiscal, monetary, or tax policies could adversely affect us or make strategic planning more difficult

We are subject to significant federal banking and federal and state securities regulation and supervision, which is primarily for the benefit and protection of our depositors and other customers and the Federal Deposit Insurance Fund and the banking system as a whole and not for the benefit of investors in our securities. In the past, our business has been materially affected by these regulations. This can be expected to continue in the future. Laws, regulations or policies, including accounting standards and interpretations, currently affecting us and our subsidiaries may change at any time. Regulatory authorities may also change their interpretation of and intensify their examination of compliance with these statutes and regulations. Therefore, our business may be adversely affected by changes in laws, regulations, policies or interpretations or regulatory approaches to compliance and enforcement, as well as by supervisory action or criminal proceedings taken as a result of perceived noncompliance, which could result in the imposition of significant penalties or fines. Changes in laws and regulations may also increase our expenses by imposing additional supervision, fees, taxes or restrictions on our operations. Compliance with laws and regulations, especially new laws and regulations, increases our operating expenses and may require additional management time and attention.

In July 2010, President Obama signed into law the Dodd-Frank Act. The Dodd-Frank Act was adopted in response to the financial crisis that ensued in 2008. The Act, among other things, created a new CFPB with broad powers to regulate consumer financial products such as credit cards and mortgages, created a Financial Stability Oversight Council comprised of the heads of other regulatory agencies, has led to new capital requirements from U.S. federal banking agencies, placed new limits on electronic debit card interchange fees, and required the SEC and national stock exchanges to adopt significant new corporate governance and executive compensation reforms.

This important legislation has affected U.S. financial institutions, including MUAH and MUB, in many ways, some of which have increased, or may increase in the future, the cost of doing business and present other challenges to the financial services industry. For additional information regarding the impact on our business of the Dodd-Frank Act and related regulations, see "Supervision and Regulation – Principal Federal Banking Laws - Dodd-Frank Act and Related Regulations" in Part I, Item 1. "Business" in our 2017 Form 10-K.

Following the 2008 financial crisis, the Federal Reserve and the other U.S. federal banking agencies adopted final rules making significant changes to the U.S. regulatory capital framework for U.S. banking organizations. For additional information, see "Supervision and Regulation – Regulatory Capital and Liquidity Standards" in Part I, Item I. "Business" and "Regulatory Capital" in Part II, Item 7. "Management’s Discussion and Analysis of Financial Condition and Results of Operations" in our 2017 Form 10-K.

On May 24, 2018, President Trump signed into law the Economic Growth, Regulatory Relief and Consumer Protection Act (the “EGRRCPA”) which amended various provisions of the Dodd-Frank Act as well as other federal banking statutes. Among other actions, the EGRRCPA raised the threshold for designation as a systemically important financial institution from $50 billion to $250 billion in assets. The new law, upon

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enactment, removes BHCs with less than $100 billion in assets from the application of enhanced prudential standards, and, 18 months after enactment, eliminates the applicability of enhanced prudential standards to BHCs with between $100 billion and $250 billion in assets unless the Federal Reserve by order or rule determines to apply enhanced prudential standards to any such institution. The Federal Reserve is authorized to establish by order or rule tailored enhanced prudential standards, including periodic stress tests and liquidity requirements, for BHCs with between $100 billion and $250 billion in assets and is required to tailor the application of enhanced prudential standards to BHCs of any size based on certain factors, including capital structure, riskiness, complexity, financial activities, size and other risk-related factors that the Federal Reserve deems appropriate. With respect to foreign banking organizations (“FBOs”), a provision of the EGRRCPA specifically states that the new law does not affect the continued applicability of enhanced prudential standards to FBOs with global assets equal to or greater than $100 billion. In addition, the new law does not limit the authority of the Federal Reserve to impose enhanced prudential standards requirements with respect to, or tailor the regulation of, an FBO with total assets equal to or greater than $100 billion, including the requirement for an IHC. Because MUFG, as an FBO, has total assets in excess of $100 billion, the Company expects that it will remain subject to the Federal Reserve’s enhanced prudential standards rules, even though various domestic BHCs with a size comparable to MUAH will be relieved from compliance with such rules.

The need to maintain more and higher quality capital under the banking agencies capital rules, as well as greater liquidity, could limit the Company’s lending and other business activities and its ability to expand, either organically or through acquisitions. It could also result in the Company taking steps to increase its capital or being limited in its ability to pay dividends or otherwise return capital to its shareholder, or selling or refraining from acquiring assets. In addition, the regulatory liquidity standards could limit the Company’s ability to invest in longer-term or less liquid assets even if more desirable from a balance sheet management perspective.

The capital rules of the U.S. federal banking agencies as well as the various other regulations referred to above, along with other regulations which may be adopted in the future, may also generally increase our cost of doing business or lead us to stop, reduce or modify our products and services.

Proposals to reform the housing finance market in the U.S. could also significantly affect our business. These proposals, among other things, include reducing or eliminating over time the role of the GSEs (Fannie Mae and Freddie Mac) in guaranteeing mortgages and providing funding for mortgage loans, as well as the implementation of reforms relating to borrowers, lenders, and investors in the mortgage market, including reducing the maximum size of a loan that the GSEs can guarantee, phasing in a minimum down payment requirement for borrowers, improving underwriting standards, and increasing accountability and transparency in the securitization process. While the specific nature of these reforms and their impact on the financial services industry in general, and on MUB in particular, is uncertain at this time, such reforms, if enacted, are likely to have a substantial impact on the mortgage market and could potentially reduce our income from mortgage originations by increasing mortgage costs or lowering originations. The GSE reforms could also reduce real estate prices, which could reduce the value of collateral securing outstanding mortgage loans. This reduction of collateral value could negatively impact the value or perceived collectability of these mortgage loans and may increase our allowance for loan losses. Such reforms may also include changes to the Federal Home Loan Bank System, which could adversely affect a significant source of funding for lending activities by the banking industry, including the Bank. These reforms may also result in higher interest rates on residential mortgage loans, thereby reducing demand, which could have an adverse impact on the Bank’s residential mortgage lending business. In addition, any impact of such changes upon the credit quality of GSE’s and, therefore, upon agency MBS securities held by MUAH could result in material reductions in valuations, as well as adverse impacts upon MUSA’s agency MBS trading business.

Several cities in the United States (including New York, Los Angeles, San Diego, San Francisco, San Jose and Seattle) have adopted responsible banking ordinances and other cities are considering the adoption of similar ordinances. These ordinances generally require banks that hold city government deposits to provide detailed accounts of their lending practices in low-income communities, as well as their participation in foreclosure prevention and home loan principal reduction programs. Performance under these ordinances is used as a basis for awarding the city’s financial services contracts. The adoption of these ordinances by municipalities for which the Bank is a provider of cash management or other banking services could result in increased regulatory and compliance costs and other operational costs and expenses, making this business less desirable to the Bank and potentially resulting in reduced opportunities for the Bank to provide these services. In August of 2015, the United States District Court for the Southern District of New York issued an order which invalidated the New York City ordinance on the ground that it was pre-empted by federal and state banking laws. The case has now

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been dismissed. Whether and to what extent other responsible banking ordinances will be challenged and invalidated cannot be predicted at this time.

As a result of supervisory actions against Wells Fargo Bank, N.A., highlighting customer abuses in the banks’ retail branch network which may have arisen at least in part from incentive compensation arrangements related to cross-selling of products and services, the federal bank regulators conducted a horizontal examination of large and mid-sized banks in the U.S. in which they issued requests for information on sales practices and incentive compensation programs at such banks. The increased regulatory focus on these subjects could lead to additional regulations and compliance costs which could impact the retail banking industry in the U.S.

International laws, regulations and policies affecting us, our subsidiaries and the business we conduct may change at any time and affect our business opportunities and competitiveness in these jurisdictions. Due to our ownership by MUFG and MUFG Bank, Ltd., laws, regulations, policies, fines and other supervisory actions adopted or enforced by the Government of Japan, the Federal Reserve and other regulators may adversely affect our activities and investments and those of our subsidiaries in the future.

We maintain systems and procedures designed to comply with applicable laws and regulations. However, some legal/regulatory frameworks provide for the imposition of criminal or civil penalties (which can be substantial) for noncompliance. In some cases, liability may attach even if the noncompliance was inadvertent or unintentional and even if reasonably designed compliance systems and procedures were in place at the time. There may be other negative consequences from a finding of noncompliance, including restrictions on certain activities and damage to our reputation. Legal or regulatory compliance failure may also adversely affect our ability to obtain regulatory approvals for future strategic initiatives.  Furthermore, failure to take necessary corrective action, or the discovery of violations of laws in the process of implementing any corrective measures, could result in further regulatory action.

Additionally, our business is affected significantly by the fiscal and monetary policies of the U.S. federal government and its agencies. We are particularly affected by the policies of the Federal Reserve, which regulates the supply of money and credit in the U.S. under the Dodd-Frank Act and a long-standing policy of the Federal Reserve, a BHC is expected to act as a source of financial and managerial strength for its subsidiary banks. As a result of that policy, we may be required to commit financial and other resources to our subsidiary bank in circumstances where we might not otherwise do so. Among the instruments of monetary policy available to the Federal Reserve are (a) conducting open market operations in U.S. Government securities, (b) changing the discount rates on borrowings by depository institutions and the federal funds rate, and (c) imposing or changing reserve requirements against certain deposits accepted by banks and borrowings by banks and their affiliates. These methods are used in varying degrees and combinations to directly affect the availability of bank loans and deposits, as well as the interest rates charged on loans and paid on deposits. In the fall of 2017, the Federal Reserve began the process of reducing its $4.5 trillion balance sheet by ceasing the reinvestment of principal on the maturing U.S. bonds that it holds. The impact of the Federal Reserve’s unwinding of quantitative easing on the U.S. economy and financial markets cannot be predicted with certainty at this time; however, this change in the Federal Reserve’s monetary policy could result in increased interest rates, changes in customer deposit behavior, and volatility in the financial markets. The policies of the Federal Reserve can be expected to have a material effect on our business, prospects, results of operations and financial condition.

Refer to "Supervision and Regulation" in Part I, Item 1. "Business" in our 2017 Form 10-K for discussion of certain additional existing and proposed laws and regulations that may affect our business.

The increasing regulation of the financial services industry has required and can be expected to continue to require significant investments in technology, personnel or other resources. Our competitors may be subject to different or reduced degrees of regulation due to their asset size or types of products offered and may also be able to more efficiently utilize resources to comply with regulations and to more efficiently absorb increased regulatory compliance costs into their existing cost structure.

The sweeping reform of the federal taxation system in the U.S., including a reduction in corporate and personal tax rates, as contained in the federal tax legislation which was enacted in December 2017, made many changes in the tax laws relevant to our business.  While such reform could have positive long-term effects on corporate profitability which could benefit the Company and its customers, there could be other potential adverse consequences such as a decrease in the value of tax credits on certain investments we may make. There could also be possible adverse consequences for the economy and the business climate, such as a large increase in the federal deficits and increasing interest rates generally, including for the federal government’s borrowing costs.

92

The potential long-run impact of these possible developments remains uncertain. For additional information regarding the possible effects of the changes in the U.S. federal tax laws on our business, see “The changes in the U.S. tax laws effective January 1, 2018, will impact our business and results of operations in a variety of ways, some of which are expected to be positive and some of which may be negative” in Part I, Item 1A. "Risk Factors" in our 2017 Form 10-K.

Company Factors

The California Consumer Privacy Act of 2018 or other such laws could result in increased operating expenses as well as additional exposure to the risk of litigation by or on behalf of customers

In June of 2018, the Governor of California signed into law The California Consumer Privacy Act of 2018 (the “CCPA”). The new law, which becomes effective on January 1, 2020, provides consumers with expansive rights and control over their personal information which is obtained by or shared with “covered businesses” (which includes most banking institutions). The CCPA will give consumers the right to request disclosure of information collected about them, and whether that information has been sold or shared with others, the right to request deletion of personal information (subject to certain exceptions), the right to opt out of the sale of the consumer’s personal information, and the right not to be discriminated against because of choices regarding the consumer’s personal information.

The CCPA provides for certain monetary penalties and for enforcement of the statute by the California Attorney General or by consumers whose rights under the law are not observed. It also provides for damages, as well as injunctive or declaratory relief, if there has been unauthorized access, theft or disclosure of personal information due to failure to implement reasonable security procedures. The CCPA contains several exemptions, including a provision to the effect that the CCPA does not apply where the information is collected, processed, sold or disclosed pursuant to the GLBA if the GLBA is in conflict with the CCPA. The impact of the CCPA on the business of MUB is yet to be determined, but it could result in increased operating expenses, as well as, additional exposure to the risk of litigation by or on behalf of consumers. It is possible that other states where we have customers could enact similar laws. For additional information, see “Supervision and Regulation – Other Federal Laws and Regulations Affecting Banks – Privacy” in Part I, Item 1. "Business" in our 2017 Form 10-K.

93

Item 6.   Exhibits

EXHIBIT INDEX

Exhibit No.	Description
3.1	Third Amended and Restated Certificate of Incorporation of the Registrant(1)
31.1	Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002(2)
31.2	Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002(2)
32.1	Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002(3)
32.2	Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002(3)
101	Pursuant to Rule 405 of Regulation S-T, the following financial information from the Company's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2018, is formatted in XBRL interactive data files: (i) Consolidated Statements of Income; (ii) Consolidated Statements of Comprehensive Income; (iii) Consolidated Balance Sheets; (iv) Consolidated Statements of Changes in Stockholders' Equity; (v) Consolidated Statements of Cash Flows; and (vi) Notes to Financial Statements(1)

(1) Incorporated by reference to Exhibit 3.1 of the Company's Current Report on Form 8-K filed September 13, 2018

(2) Filed herewith.

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

94

SIGNATURES

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

	MUFG AMERICAS HOLDINGS CORPORATION (Registrant)
Date: November 7, 2018	By:	/s/ STEPHEN E. CUMMINGS
		Stephen E. Cummings President and Chief Executive Officer (Principal Executive Officer)
Date: November 7, 2018	By:	/s/ JOHANNES WORSOE
		Johannes Worsoe Chief Financial Officer (Principal Financial Officer)
Date: November 7, 2018	By:	/s/ NEAL HOLLAND
		Neal Holland Controller and Chief Accounting Officer (Principal Accounting Officer)

95

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Stephen E. Cummings, certify that:

1. I have reviewed this quarterly report on Form 10-Q of MUFG Americas Holdings Corporation (the "Registrant");

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

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

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

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

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

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

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

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

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

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

Date: November 7, 2018

By:	/s/ STEPHEN E. CUMMINGS
	Stephen E. Cummings President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Johannes Worsoe, certify that:

1. I have reviewed this quarterly report on Form 10-Q of MUFG Americas Holdings Corporation (the "Registrant");

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

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

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

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

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

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

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

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

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

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

Date: November 7, 2018

By:	/s/ JOHANNES WORSOE
	Johannes Worsoe Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report of MUFG Americas Holdings Corporation (the "Company") on Form 10-Q for the period ended September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Stephen E. Cummings, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

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

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

Dated: November 7, 2018

By:	/s/ STEPHEN E. CUMMINGS
	Stephen E. Cummings President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report of MUFG Americas Holdings Corporation (the "Company") on Form 10-Q for the period ended September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Johannes Worsoe, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

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

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

Dated: November 7, 2018

By:	/s/ JOHANNES WORSOE
	Johannes Worsoe Chief Financial Officer

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document And Entity Information
Entity Registrant Name	MUFG Americas Holdings Corporation
Entity Central Index Key	0001011659
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		147,589,713
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	ub

XML

Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Interest Income
Loans	$ 844		$ 738		$ 2,426	$ 2,170
Securities	168		149		491	407
Securities borrowed or purchased under resale agreements	171		97		454	243
Trading assets	109		89		308	245
Other	25		10		58	28
Total interest income	1,317		1,083		3,737	3,093
Interest Expense
Deposits	124		62		278	169
Commercial paper and other short-term borrowings	46		17		121	35
Long-term debt	92		66		266	183
Securities loaned or sold under repurchase agreements	193		102		509	245
Trading liabilities	30		20		81	56
Total interest expense	485		267		1,255	688
Net Interest Income	832	[1]	816	[1]	2,482	2,405
(Reversal of) provision for credit losses	64	[1]	18	[1]	43	(34)
Net interest income after (reversal of) provision for credit losses	768		798		2,439	2,439
Noninterest Income
Service charges on deposit accounts	44		47		134	142
Trust and investment management fees	30		32		89	91
Trading Gain (Loss)	(5)		(3)
Trading account activities					(13)	(10)
Securities gains, net	1		6		4	15
Credit facility fees	23		26		69	75
Brokerage commissions and fees					55	52
Card processing fees, net	12		10		37	34
Investment Banking Revenue	108		106
Investment banking and syndication fees	18		16		285	288
Fees from affiliates	306		209		881	639
Other, net	89		66		63	166
Total noninterest income	626		515		1,604	1,492
Noninterest Expense
Salaries and employee benefits	652		621		2,000	1,881
Net occupancy and equipment	89		87		264	256
Professional and outside services	110		101		356	316
Software	73		49		213	142
Regulatory assessments	24		22		69	61
Intangible asset amortization	6		8		20	22
Other	105		94		304	267
Total noninterest expense	1,059	[1]	982	[1]	3,226	2,945
Income before income taxes and including noncontrolling interests	335	[1]	331	[1]	817	986
Income tax expense (benefit)	35	[1]	109	[1]	21	255
Net Income Including Noncontrolling Interests	300	[1]	222	[1]	796	731
Deduct: Net loss from noncontrolling interests	6	[1]	10	[1]	20	25
Net Income Attributable to MUAH	$ 306	[1]	$ 232	[1]	$ 816	$ 756

[1] As of and for the Three Months Ended September 30, 2018:(Dollars in millions) Regional Bank U.S. Wholesale & Investment Banking Transaction Banking MUSA Other MUFG Americas Holdings CorporationResults of operations Net interest income $553 $104 $66 $52 $57 $832Noninterest income 111 103 15 94 303 626Total revenue 664 207 81 146 360 1,458Noninterest expense 518 106 65 121 249 1,059(Reversal of) provision for credit losses 45 27 (3) — (5) 64Income (loss) before income taxes and including noncontrolling interests 101 741925 116335Income tax expense (benefit) (1) 17 (3) 5 6 10 35Net income (loss) including noncontrolling interests 84 77 14 19 106 300Deduct: net (income) loss from noncontrolling interests — — — — 6 6Net income (loss) attributable to MUAH $84 $77 $14 $19 $112 $306 Total assets, end of period $71,501 $19,467 $882 $33,366 $35,820 $161,036

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income Attributable to MUAH	$ 306	[1]	$ 232	[1]	$ 816	$ 756
Other Comprehensive Income (Loss), Net of Tax:
Net change in unrealized gains (losses) on cash flow hedges	8		(3)		(58)	(11)
Net change in unrealized gains (losses) on investment securities	(46)		17		(277)	76
Foreign currency translation adjustment	0		4		(2)	7
Pension and other postretirement benefit adjustments	10		7		30	20
Other	0		1		(1)	1
Total other comprehensive income (loss)	(28)		26		(308)	93
Comprehensive Income (Loss) Attributable to MUAH	278		258		508	849
Comprehensive income (loss) from noncontrolling interests	(6)		(10)		(20)	(25)
Total Comprehensive Income (Loss)	$ 272		$ 248		$ 488	$ 824

[1] As of and for the Three Months Ended September 30, 2018:(Dollars in millions) Regional Bank U.S. Wholesale & Investment Banking Transaction Banking MUSA Other MUFG Americas Holdings CorporationResults of operations Net interest income $553 $104 $66 $52 $57 $832Noninterest income 111 103 15 94 303 626Total revenue 664 207 81 146 360 1,458Noninterest expense 518 106 65 121 249 1,059(Reversal of) provision for credit losses 45 27 (3) — (5) 64Income (loss) before income taxes and including noncontrolling interests 101 741925 116335Income tax expense (benefit) (1) 17 (3) 5 6 10 35Net income (loss) including noncontrolling interests 84 77 14 19 106 300Deduct: net (income) loss from noncontrolling interests — — — — 6 6Net income (loss) attributable to MUAH $84 $77 $14 $19 $112 $306 Total assets, end of period $71,501 $19,467 $882 $33,366 $35,820 $161,036

XML

Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2018		Dec. 31, 2017
Assets
Cash and due from banks		$ 1,884		$ 2,057
Interest bearing deposits in banks		2,308		1,335
Total cash and cash equivalents		4,192		3,392
Securities borrowed or purchased under resale agreements		21,265		20,894
Trading account assets (includes $1,578 at September 30, 2018 and $1,001 at December 31, 2017 pledged as collateral that may be repledged)		11,213		10,567
Securities available for sale (includes $61 at September 30, 2018 and $163 at December 31, 2017 pledged as collateral that may be repledged)		17,077		17,563
Securities held to maturity (fair value $10,972 at September 30, 2018 and $9,799 at December 31, 2017)		11,320		9,885
Loans held for investment	[1]	83,653		80,014
Allowance for loan losses		(501)		(476)
Loans held for investment, net		83,152		79,538
Premises and equipment, net		624		610
Goodwill		3,301		3,301
Other assets		8,892		8,800
Total assets		161,036	[2]	154,550
Deposits:
Noninterest bearing		32,225		32,602
Interest bearing		55,586		52,185
Total deposits		87,811		84,787
Securities Sold under Agreements to Repurchase and Securities Loaned		27,032		26,437
Commercial paper and other short-term borrowings		8,309		7,066
Long-term debt		12,796		12,162
Trading account liabilities		4,029		3,600
Other liabilities		2,237		2,143
Total liabilities		142,214		136,195
Commitments, contingencies and guarantees—See Note 12
Preferred stock:
Authorized 5,000,000 shares; no shares issued or outstanding		0		0
Common stock, par value $1 per share:
Authorized 1,700,000,000 shares, 147,589,713 shares issued and outstanding as of September 30, 2018 and December 31, 2017		148		148
Additional paid-in capital		8,158		8,197
Retained earnings		11,749		10,936
Accumulated other comprehensive loss		(1,313)		(1,026)
Total MUAH stockholders' equity		18,742		18,255
Noncontrolling interests		80		100
Total equity		18,822		18,355
Total liabilities and equity		$ 161,036		$ 154,550

[1] Includes $338 million and $301 million at September 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.

[2] As of and for the Three Months Ended September 30, 2018:(Dollars in millions) Regional Bank U.S. Wholesale & Investment Banking Transaction Banking MUSA Other MUFG Americas Holdings CorporationResults of operations Net interest income $553 $104 $66 $52 $57 $832Noninterest income 111 103 15 94 303 626Total revenue 664 207 81 146 360 1,458Noninterest expense 518 106 65 121 249 1,059(Reversal of) provision for credit losses 45 27 (3) — (5) 64Income (loss) before income taxes and including noncontrolling interests 101 741925 116335Income tax expense (benefit) (1) 17 (3) 5 6 10 35Net income (loss) including noncontrolling interests 84 77 14 19 106 300Deduct: net (income) loss from noncontrolling interests — — — — 6 6Net income (loss) attributable to MUAH $84 $77 $14 $19 $112 $306 Total assets, end of period $71,501 $19,467 $882 $33,366 $35,820 $161,036

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Trading account assets pledged as collateral	$ 1,578	$ 1,001
Securities available-for-sale pledged as collateral	61	163
Fair value of securities held to maturity	$ 10,972	$ 9,799
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (dollars per share)	$ 1	$ 1
Common stock, share authorized (in shares)	1,700,000,000	300,000,000
Common stock, share issued (in shares)	147,589,713	147,589,713
Common stock, share outstanding (in shares)	147,589,713	147,589,713

XML

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions		Total		Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 731				$ 756		$ (25)
Balance, beginning at Dec. 31, 2016		17,386		$ 144	$ 7,884	10,101	$ (896)	153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), net of tax		93					93
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		(26)			(26)	0
Other		(7)		1	0	0		(8)
Balance, ending at Sep. 30, 2017		18,579		148	8,179	10,935	(803)	120
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues		402		3	321	78
Stockholders' Equity, Period Increase (Decrease)		1,193		4	295	834	93	(33)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	[1]	222
Balance, beginning at Jun. 30, 2017							(829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), net of tax		26
Balance, ending at Sep. 30, 2017		18,579		148	8,179	10,935	(803)	120
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		796				816		(20)
Balance, beginning at Dec. 31, 2017		18,355		148	8,197	10,936	(1,026)	100
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), net of tax		(308)					(308)
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		(21)			(18)	(3)
Other		0	[2]	0	(21)	0	21	0
Balance, ending at Sep. 30, 2018		18,822		148	8,158	11,749	(1,313)	80
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Period Increase (Decrease)		467		0	(39)	813	(287)	(20)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	[1]	300
Balance, beginning at Jun. 30, 2018							(1,285)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), net of tax		(28)
Balance, ending at Sep. 30, 2018		$ 18,822		$ 148	$ 8,158	$ 11,749	$ (1,313)	$ 80

[1] As of and for the Three Months Ended September 30, 2018:(Dollars in millions) Regional Bank U.S. Wholesale & Investment Banking Transaction Banking MUSA Other MUFG Americas Holdings CorporationResults of operations Net interest income $553 $104 $66 $52 $57 $832Noninterest income 111 103 15 94 303 626Total revenue 664 207 81 146 360 1,458Noninterest expense 518 106 65 121 249 1,059(Reversal of) provision for credit losses 45 27 (3) — (5) 64Income (loss) before income taxes and including noncontrolling interests 101 741925 116335Income tax expense (benefit) (1) 17 (3) 5 6 10 35Net income (loss) including noncontrolling interests 84 77 14 19 106 300Deduct: net (income) loss from noncontrolling interests — — — — 6 6Net income (loss) attributable to MUAH $84 $77 $14 $19 $112 $306 Total assets, end of period $71,501 $19,467 $882 $33,366 $35,820 $161,036

[2] For additional information on other, see Note 10

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net income including noncontrolling interests	$ 796	$ 731
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Reversal of) provision for credit losses	43	(34)
Depreciation, amortization and accretion, net	297	265
Stock-based compensation—restricted stock units	58	49
Deferred income taxes	(119)	138
Net gains on sales of securities	(4)	(15)
Net decrease (increase) in securities borrowed or purchased under resale agreements	(371)	(2,144)
Net decrease (increase) in securities loaned or sold under repurchase agreements	594	2,691
Net decrease (increase) in trading account assets	(646)	(1,281)
Net decrease (increase) in other assets	(573)	369
Net increase (decrease) in trading account liabilities	429	433
Net increase (decrease) in other liabilities	62	(331)
Loans originated for sale	(1,215)	(473)
Net proceeds from sale of loans originated for sale	1,077	505
Pension and other benefits adjustment	(37)	(156)
Other, net	(20)	12
Total adjustments	(425)	28
Net cash provided by (used in) operating activities	371	759
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	853	1,953
Proceeds from paydowns and maturities of securities available for sale	2,252	1,836
Purchases of securities available for sale	(4,697)	(7,195)
Proceeds from paydowns and maturities of securities held to maturity	1,262	1,324
Purchases of securities held to maturity	(772)	(1,235)
Proceeds from sales of loans	563	751
Net decrease (increase) in loans	(3,735)	(1,793)
Purchases of other investments	(188)	(131)
Other, net	(59)	(12)
Net cash provided by (used in) investing activities	(4,521)	(4,502)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	3,017	(1,495)
Net increase (decrease) in commercial paper and other short-term borrowings	1,241	3,630
Proceeds from issuance of long-term debt	4,058	4,122
Repayment of long-term debt	(3,367)	(4,591)
Other, net	(117)	(76)
Change in noncontrolling interests	0	(8)
Net cash provided by (used in) financing activities	4,832	1,582
Net change in cash, cash equivalents and restricted cash	682	(2,161)
Cash, cash equivalents and restricted cash at beginning of period	3,528	5,834
Cash, cash equivalents and restricted cash at end of period	4,210	3,673
Cash Paid During the Period For:
Interest	1,180	652
Income taxes, net	121	168
Supplemental Schedule of Noncash Investing and Financing Activities:
Securities available for sale transferred to securities held to maturity	10	833
Securities available for sale transferred to securities held to maturity	1,924	0
Carrying Value of Assets Acquired	0	1,003
Carrying Value of Liabilities Assumed	0	601
Reconciliation of Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents	3,392
Total cash, cash equivalents and restricted cash per consolidated statement of cash flows	$ 3,528	$ 5,834

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Summary of Significant Accounting Policies and Nature of Operations

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies and Nature of Operations

Summary of Significant Accounting Policies and Nature of Operations

MUFG Americas Holdings Corporation (MUAH) is a financial holding company, bank holding company and intermediate holding company whose principal subsidiaries are MUFG Union Bank, N.A. (MUB or the Bank) and MUFG Securities Americas Inc. (MUSA). MUAH provides a wide range of financial services to consumers, small businesses, middle-market companies and major corporations nationally and internationally. The Company also provides various business, banking, financial, administrative and support services, and facilities for MUFG Bank, Ltd. (formerly The Bank of Tokyo-Mitsubishi UFJ, Ltd.) in connection with the operation and administration of MUFG Bank, Ltd.'s business in the U.S. (including MUFG Bank, Ltd.'s U.S. branches). All of the Company's issued and outstanding shares of common stock are owned by MUFG Bank, Ltd. and MUFG. The unaudited Consolidated Financial Statements of MUFG Americas Holdings Corporation, its subsidiaries, and its consolidated variable interest entities (the Company) have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial reporting and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Rules and Regulations of the SEC. However, they do not include all of the disclosures necessary for annual financial statements. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation have been included. The results of operations for the third quarter of 2018 are not necessarily indicative of the operating results anticipated for the full year. These unaudited Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 (2017 Form 10-K).

The preparation of financial statements in conformity with 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. Critical estimates made by management in the preparation of the Company’s financial statements include, but are not limited to, the allowance for credit losses (Note 3 "Loans and Allowance for Loan Losses"), goodwill impairment, fair value of financial instruments (Note 8 "Fair Value Measurement and Fair Value of Financial Instruments"), pension accounting (Note 11 "Employee Pension and Other Postretirement Benefits"), income taxes, and transfer pricing.

During the first quarter of 2018, the Company refined its methodology for estimating the allowance for commercial loans collectively evaluated for impairment and the allowance for losses on unfunded credit commitments. Previously the Company derived the allowance for these loans by assigning a loss factor based on an internal risk rating that estimated the probability that a credit facility may ultimately default (i.e. probability of default). The refinement implemented during the first quarter of 2018 utilizes a dual factor internal risk rating system that encompasses both the probability of default and an estimate of the severity of the loss that would be realized upon such default (i.e. the loss-given default). During the second quarter of 2018, the Company implemented refinements to the qualitative considerations used in our reserve methodology.     

Recently Issued Accounting Pronouncements

Accounting for Leases

In February 2016, the FASB issued ASU 2016-02, Leases, which will require entities that lease assets (i.e., lessees) to recognize assets and liabilities on their balance sheet for the rights and obligations created by those leases. The accounting by entities that own the assets leased (i.e., lessors) will remain largely unchanged; however, leveraged lease accounting will no longer be permitted for leases that commence after the effective date. The ASU will also require qualitative and quantitative disclosures about the amount, timing and uncertainty of cash flows arising from leases. The ASU is effective for interim and annual periods beginning on January 1, 2019 and requires a modified retrospective approach, with early adoption permitted. In July 2018, the FASB issued ASU 2018-11, Leases, which allows entities the option to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company plans to adopt the ASU on January 1, 2019. The Company is in the technology testing phase of this project to support the ongoing lessee accounting required under the ASU. Management is currently assessing the impact of this guidance on the Company's financial position and results of operations.

Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments, which provides new guidance on the accounting for credit losses for instruments that are within its scope. This new guidance is commonly referred to as the current expected credit loss (“CECL”) model. For loans and debt securities accounted for at amortized cost, certain off-balance sheet credit exposures, net investments in leases, and trade receivables, the ASU requires an entity to recognize its estimate of credit losses expected over the life of the financial instrument or exposure. Lifetime expected credit losses on purchased financial assets with credit deterioration will be recognized as an allowance with an offset to the cost basis of the asset. For available for sale debt securities, the new standard will require recognition of expected credit losses by recognizing an allowance for credit losses when the fair value of the security is below amortized cost and the recognition of this allowance is limited to the difference between the security’s amortized cost basis and fair value. The ASU is effective for interim and annual periods beginning on January 1, 2020, with early adoption permitted in 2019. The Company plans to adopt the ASU on January 1, 2020. The Company is in the design phase of the implementation. Management is currently assessing the impact of this guidance on the Company’s financial position and results of operations.

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment. The ASU removes Step 2 of the goodwill impairment test, which measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. Under the amendments, a goodwill impairment loss will be measured as the amount by which a reporting unit’s carrying amount exceeds its fair value; however, the loss recognized cannot exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss. The ASU will be effective for MUAH beginning January 1, 2020 on a prospective basis. Early adoption is permitted for any impairment tests performed after January 1, 2017. Management does not expect the adoption of this guidance to significantly impact the Company’s financial position or results of operations.

Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities, which requires premiums on certain purchased callable debt securities to be amortized to the earliest call date. Under current guidance, premiums on callable debt securities are generally amortized over the contractual life of the security. The amortization period for callable debt securities purchased at a discount will not be impacted. The ASU is effective for interim and annual periods beginning on January 1, 2019 and requires a modified retrospective approach, 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.

Targeted Improvements to Accounting for Hedging Activities

In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities, which will make more hedging strategies eligible for hedge accounting, simplify the application of hedge accounting, and enhance the transparency and understandability of hedge results. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. It also amends the disclosure requirements and changes how entities assess effectiveness. The guidance will be effective for MUAH beginning January 1, 2019, with early adoption permitted. If the guidance is early adopted in an interim period, any adjustments would be reflected as of the beginning of the fiscal year that includes that interim period. Management is currently assessing the impact of this guidance on the Company’s financial position and results of operations.

Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement

In August 2018, the FASB issued ASU 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement, which modifies disclosure requirements on fair value measurements to improve their effectiveness. The guidance permits entities to consider materiality when evaluating fair value measurement disclosures and, among other modifications, requires certain new disclosures related to Level 3 fair value measurements. The guidance will be effective for MUAH beginning January 1, 2020, with early adoption permitted. The guidance only affects disclosures in the notes to the consolidated financial statements and will not affect the Company’s financial position or results of operations.

Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued ASU 2018-14, Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans, which modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans to improve the effectiveness of the disclosures. The guidance includes new requirements to disclose the weighted-average interest crediting rate for cash balance plans and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation. The guidance is effective for years ending after December 15, 2020, with early adoption permitted. This guidance only affects disclosures in the notes to the consolidated financial statements and will not affect the Company’s financial position or results of operations.

Recently Adopted Accounting Pronouncements

Revenue from Contracts with Customers

Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, which provides guidance on the core principle that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU applies to all contracts with customers, except financial instruments, guarantees, lease contracts, insurance contracts and certain non-monetary exchanges. This guidance did not significantly affect the Company's financial position and results of operations. As a result of adopting this guidance, the Company's accounting policies have been updated as summarized below.

Revenues from Contracts with Customers

Revenues from contracts with customers include service charges on deposit accounts, trust and investment management fees, brokerage commissions and fees, card processing fees, net, investment banking and syndication fees, and fees from affiliates. The Company recognizes revenue from contracts with customers according to a five-step revenue recognition model: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the entity satisfies a performance obligation. The Company’s contracts with customers generally contain a single performance obligation or separately identified performance obligations, each with a stated transaction price and generally do not involve a significant timing difference between satisfaction of the performance obligation and customer payment. Revenues are recognized over time or at a point in time as the performance obligations are satisfied. Certain revenues, primarily included within brokerage commissions and fees, are variable. However, recognition of these variable revenues does not involve significant estimates or constraints.

Principal versus Agent Considerations (Reporting Revenue Gross versus Net)

Effective January 1, 2018, the Company adopted ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net). The ASU amends ASU 2014-09, Revenue from Contracts with Customers, with respect to assessing whether an entity is a principal (and thus presents revenue gross) or an agent (and thus presents revenue net). The amendments retain the guidance that the principal in an arrangement controls a good or service before it is transferred to a customer and clarify: (1) that an entity must first identify the specified good or service being provided to the customer; (2) that the unit of account for the principal versus agent assessment is each specified good or service promised in a contract; (3) indicators and examples to help an entity evaluate whether it is the principal; and (4) how to assess whether an entity controls services performed by another party. As a result of adopting ASU 2016-08, beginning January 1, 2018, certain expenses that were previously presented as a reduction of related fees from affiliates and investment banking and syndication fees are presented in noninterest expense.

Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost

Effective January 1, 2018, the Company adopted ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which amended the income statement presentation of the components of net periodic benefit cost for sponsored defined benefit pension and other postretirement plans. As a result of adopting ASU 2017-07, the salaries and employee benefits expense and other expense categories in noninterest expense have been adjusted to reflect adoption of this guidance as follows.

	For the Three Months Ended							For the Nine Months Ended
	September 30, 2017							September 30, 2017
(Dollars in millions)	As Previously Reported		Adjustment			As Reported under New Guidance		As Previously Reported		Adjustment			As Reported under New Guidance
Salaries and employee benefits	$	589	$	32		$	621	$	1,790	$	91		$	1,881
Other	126		(32		)	94		358		(91		)	267

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Securities

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Securities

Securities

Securities Available for Sale

At September 30, 2018 and December 31, 2017, the amortized cost, gross unrealized gains, gross unrealized losses and fair values of securities available for sale are presented below.

	September 30, 2018
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset Liability Management securities:
U.S. Treasury	$	3,964	$	—	$	234	$	3,730
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	8,739		2		240		8,501
Privately issued	891		—		30		861
Privately issued - commercial mortgage-backed securities	1,109		—		31		1,078
Collateralized loan obligations	1,434		1		1		1,434
Other	4		—		—		4
Asset Liability Management securities	16,141		3		536		15,608
Other debt securities:
Direct bank purchase bonds	1,292		28		39		1,281
Other	188		1		1		188
Total securities available for sale	$	17,621	$	32	$	576	$	17,077

	December 31, 2017
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset Liability Management securities:
U.S. Treasury	$	3,370	$	—	$	118	$	3,252
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	9,338		2		132		9,208
Privately issued	695		3		4		694
Privately issued - commercial mortgage-backed securities	823		4		5		822
Collateralized loan obligations	1,895		10		—		1,905
Other	5		—		—		5
Asset Liability Management securities	16,126		19		259		15,886
Other debt securities:
Direct bank purchase bonds	1,495		38		30		1,503
Other	163		1		—		164
Equity securities	10		—		—		10
Total securities available for sale	$	17,794	$	58	$	289	$	17,563

The Company’s securities available for sale with a continuous unrealized loss position at September 30, 2018 and December 31, 2017 are shown below, identified for periods less than 12 months and 12 months or more.

	September 30, 2018
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Asset Liability Management securities:
U.S. Treasury	$	869	$	20	$	2,813	$	214	$	3,682	$	234
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	3,996		71		3,572		169		7,568		240
Privately issued	642		19		193		11		835		30
Privately issued - commercial mortgage-backed securities	679		17		299		14		978		31
Collateralized loan obligations	606		1		—		—		606		1
Asset Liability Management securities	6,792		128		6,877		408		13,669		536
Other debt securities:
Direct bank purchase bonds	307		10		393		29		700		39
Other	109		1		—		—		109		1
Total securities available for sale	$	7,208	$	139	$	7,270	$	437	$	14,478	$	576

	December 31, 2017
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Asset Liability Management securities:
U.S. Treasury	$	1,074	$	14	$	2,128	$	104	$	3,202	$	118
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	3,606		22		4,651		110		8,257		132
Privately issued	275		1		164		3		439		4
Privately issued - commercial mortgage-backed securities	447		3		80		2		527		5
Collateralized loan obligations	12		—		—		—		12		—
Asset Liability Management securities	5,414		40		7,023		219		12,437		259
Other debt securities:
Direct bank purchase bonds	58		4		563		26		621		30
Other	79		—		—		—		79		—
Equity securities	10		—		—		—		10		—
Total securities available for sale	$	5,561	$	44	$	7,586	$	245	$	13,147	$	289

At September 30, 2018, 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, such as Ginnie Mae, or a government-sponsored agency such as Freddie Mac or Fannie 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 from changes in credit quality. At September 30, 2018, 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 are collateralized by commercial mortgage loans and are generally subject to prepayment penalties. The unrealized losses on commercial mortgage-backed securities resulted from higher market yields since purchase. 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 September 30, 2018, the Company expects to recover the entire amortized cost basis of these securities.

The Company’s CLOs consist of Cash Flow CLOs. A Cash Flow CLO is a structured finance product that securitizes a diversified pool of loan assets into multiple classes of notes. Cash Flow CLOs pay the note holders through the receipt of interest and principal repayments from the underlying loans unlike other types of CLOs that pay note holders through the trading and sale of underlying collateral. Unrealized losses typically arise from widening credit spreads and deteriorating credit quality of the underlying collateral. Cash flow analysis of the underlying collateral provides an estimate of other-than-temporary impairment, which is performed quarterly when the fair value of a security is lower than its amortized cost. Based on the analysis performed as of September 30, 2018, 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 estimates the unrealized loss 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 September 30, 2018, 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.

	September 30, 2018
(Dollars in millions)	One Year or Less		Over One Year Through Five Years		Over Five Years Through Ten Years		Over Ten Years		Total Fair Value
Asset Liability Management securities:
U.S. Treasury	$	—	$	1,163	$	2,567	$	—	$	3,730
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	—		266		1,354		6,881		8,501
Privately issued	—		—		—		861		861
Privately issued - commercial mortgage-backed securities	—		—		42		1,036		1,078
Collateralized loan obligations	—		2		389		1,043		1,434
Other	1		3		—		—		4
Asset Liability Management securities	1		1,434		4,352		9,821		15,608
Other debt securities:
Direct bank purchase bonds	112		301		741		127		1,281
Other	—		169		—		19		188
Total debt securities available for sale	$	113	$	1,904	$	5,093	$	9,967	$	17,077

The gross realized gains and losses from sales of available for sale securities for the three and nine months endedSeptember 30, 2018 and 2017 are shown below. The specific identification method is used to calculate realized gains and losses on sales.

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Dollars in millions)	2018		2017		2018		2017
Gross realized gains	$	1	$	6	$	4	$	15

Securities Held to Maturity

At September 30, 2018 and December 31, 2017, the amortized cost, gross unrealized gains and losses recognized in OCI, carrying amount, gross unrealized gains and losses not recognized in OCI, and fair values of securities held to maturity are presented below. Management has asserted the positive intent and ability to hold these securities to maturity.

	September 30, 2018
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury	$	527	$	—	$	—	$	527	$	2	$	3	$	526
U.S. government-sponsored agencies	772		—		—		772		—		1		771
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	8,651		2		101		8,552		3		337		8,218
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	1,514		—		45		1,469		8		20		1,457
Total securities held to maturity	$	11,464	$	2	$	146	$	11,320	$	13	$	361	$	10,972

	December 31, 2017
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury	$	525	$	—	$	—	$	525	$	3	$	1	$	527
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	7,870		2		31		7,841		15		130		7,726
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	1,571		—		52		1,519		36		9		1,546
Total securities held to maturity	$	9,966	$	2	$	83	$	9,885	$	54	$	140	$	9,799

Amortized cost is defined as the original purchase cost, adjusted for any accretion or amortization of a purchase discount or premium, less principal payments and any impairment previously recognized in earnings. The carrying amount is the difference between the amortized cost and the amount recognized in OCI. The amount recognized in OCI primarily reflects the unrealized gain or loss at date of transfer from available for sale to the held to maturity classification, net of amortization, which is recorded in interest income on securities.

The Company’s securities held to maturity with a continuous unrealized loss position at September 30, 2018 and December 31, 2017 are shown below, separately for periods less than 12 months and 12 months or more.

	September 30, 2018
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
U.S. Treasury	$	494	$	—	$	3	$	—	$	—	$	—	$	494	$	—	$	3
U.S. government-sponsored agencies	720		—		1		—		—		—		720		—		1
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	2,753		28		73		5,300		73		264		8,053		101		337
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	46		—		1		1,411		45		19		1,457		45		20
Total securities held to maturity	$	4,013	$	28	$	78	$	6,711	$	118	$	283	$	10,724	$	146	$	361

	December 31, 2017
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
U.S. Treasury	$	494	$	—	$	1	$	—	$	—	$	—	$	494	$	—	$	1
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	2,649		—		31		4,000		31		99		6,649		31		130
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	19		—		—		1,496		52		9		1,515		52		9
Total securities held to maturity	$	3,162	$	—	$	32	$	5,496	$	83	$	108	$	8,658	$	83	$	140

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.

					September 30, 2018
	Within One Year				Over One Year Through Five Years				Over Five Years Through Ten Years				Over Ten Years				Total
(Dollars in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
U.S. Treasury	$	518	$	516	$	9	$	10	$	—	$	—	$	—	$	—	$	527	$	526
U.S. government-sponsored agencies	—		—		—		—		772		771		—		—		772		771
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	—		—		—		—		1,058		1,022		7,494		7,196		8,552		8,218
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	48		49		794		796		—		—		627		612		1,469		1,457
Total securities held to maturity	$	566	$	565	$	803	$	806	$	1,830	$	1,793	$	8,121	$	7,808	$	11,320	$	10,972

Securities Pledged and Received as Collateral

At September 30, 2018 and December 31, 2017, the Company pledged $12.7 billion and $12.3 billion of available for sale and trading securities as collateral, respectively, of which $1.6 billion and $1.2 billion, respectively, was permitted to be sold or repledged. These securities were pledged as collateral for derivative liability positions, securities loaned or sold under repurchase agreements, short-term borrowings and to secure public and trust department deposits.

At September 30, 2018 and December 31, 2017, the Company received $29.3 billion and $31.8 billion, respectively, of collateral, of which $29.3 billion and $31.8 billion, respectively, was permitted to be sold or repledged. Of the collateral received, the Company sold or repledged $28.3 billion and $30.4 billion at September 30, 2018 and December 31, 2017, respectively, for derivative asset positions and securities borrowed or purchased under resale agreements.

For additional information related to the Company's significant accounting policies on securities pledged as collateral, see Note 1 "Summary of Significant Accounting Policies and Nature of Operations" to our Consolidated Financial Statements in Part II, Item 8. "Financial Statements and Supplementary Data" in our 2017 Form 10-K.

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Loans and Allowance for Loan Losses

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Loans and Allowance for Loan Losses

Loans and Allowance for Loan Losses

The following table provides the outstanding balances of loans held for investment at September 30, 2018 and December 31, 2017.

(Dollars in millions)	September 30, 2018			December 31, 2017
Loans held for investment:
Commercial and industrial	$	23,349		$	23,281
Commercial mortgage	15,031			14,320
Construction	1,480			1,775
Lease financing	1,417			1,533
Total commercial portfolio	41,277			40,909
Residential mortgage	38,059			35,643
Home equity and other consumer loans	4,317			3,462
Total consumer portfolio	42,376			39,105
Total loans held for investment(1)	83,653			80,014
Allowance for loan losses	(501		)	(476		)
Loans held for investment, net	$	83,152		$	79,538

(1) Includes $338 million and $301 million at September 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.

Allowance for Loan Losses

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

	For the Three Months Ended September 30, 2018
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	362		$	78		$	5	$	445
(Reversal of) provision for loan losses	33			24			5		62
Loans charged-off	(8		)	(8		)	—		(16		)
Recoveries of loans previously charged-off	8			2			—		10
Allowance for loan losses, end of period	$	395		$	96		$	10	$	501

	For the Three Months Ended September 30, 2017
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	435		$	78		$	—	$	513
(Reversal of) provision for loan losses	(7		)	10			30		33
Other	2			—			—		2
Loans charged-off	(7		)	(10		)	—		(17		)
Recoveries of loans previously charged-off	8			3			—		11
Allowance for loan losses, end of period	$	431		$	81		$	30	$	542

	For the Nine Months Ended September 30, 2018
(Dollars in millions)	Commercial			Consumer			Unallocated			Total
Allowance for loan losses, beginning of period	$	360		$	86		$	30		$	476
(Reversal of) provision for loan losses	32			32			(20		)	44
Loans charged-off	(15		)	(27		)	—			(42		)
Recoveries of loans previously charged-off	18			5			—			23
Allowance for loan losses, end of period	$	395		$	96		$	10		$	501

	For the Nine Months Ended September 30, 2017
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	556		$	83		$	—	$	639
(Reversal of) provision for loan losses	(57		)	26			30		(1		)
Other	2			—			—		2
Loans charged-off	(91		)	(32		)	—		(123		)
Recoveries of loans previously charged-off	21			4			—		25
Allowance for loan losses, end of period	$	431		$	81		$	30	$	542

The following tables show the allowance for loan losses and related loan balances by portfolio segment as of September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Commercial		Consumer		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	116	$	13	$	—	$	129
Collectively evaluated for impairment	279		83		10		372
Total allowance for loan losses	$	395	$	96	$	10	$	501
Loans held for investment:
Individually evaluated for impairment	$	497	$	289	$	—	$	786
Collectively evaluated for impairment	40,780		42,087		—		82,867
Total loans held for investment	$	41,277	$	42,376	$	—	$	83,653

	December 31, 2017
(Dollars in millions)	Commercial		Consumer		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	58	$	15	$	—	$	73
Collectively evaluated for impairment	302		71		30		403
Total allowance for loan losses	$	360	$	86	$	30	$	476
Loans held for investment:
Individually evaluated for impairment	$	544	$	321	$	—	$	865
Collectively evaluated for impairment	40,365		38,784		—		79,149
Total loans held for investment	$	40,909	$	39,105	$	—	$	80,014

Nonaccrual and Past Due Loans

The following table presents nonaccrual loans as of September 30, 2018 and December 31, 2017.

(Dollars in millions)	September 30, 2018		December 31, 2017
Commercial and industrial	$	268	$	319
Commercial mortgage	12		20
Total commercial portfolio	280		339
Residential mortgage	111		104
Home equity and other consumer loans	20		22
Total consumer portfolio	131		126
Total nonaccrual loans	$	411	$	465
Troubled debt restructured loans that continue to accrue interest	$	354	$	348
Troubled debt restructured nonaccrual loans (included in total nonaccrual loans above)	$	252	$	229

The following tables show the aging of the balance of loans held for investment by class as of September 30, 2018 and December 31, 2017.

	September 30, 2018
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	24,634	$	31	$	101	$	132	$	24,766
Commercial mortgage	14,989		38		4		42		15,031
Construction	1,480		—		—		—		1,480
Total commercial portfolio	41,103		69		105		174		41,277
Residential mortgage	37,855		166		38		204		38,059
Home equity and other consumer loans	4,284		22		11		33		4,317
Total consumer portfolio	42,139		188		49		237		42,376
Total loans held for investment	$	83,242	$	257	$	154	$	411	$	83,653

	December 31, 2017
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	24,734	$	17	$	63	$	80	$	24,814
Commercial mortgage	14,298		16		6		22		14,320
Construction	1,775		—		—		—		1,775
Total commercial portfolio	40,807		33		69		102		40,909
Residential mortgage	35,453		151		39		190		35,643
Home equity and other consumer loans	3,427		23		12		35		3,462
Total consumer portfolio	38,880		174		51		225		39,105
Total loans held for investment	$	79,687	$	207	$	120	$	327	$	80,014

Loans 90 days or more past due and still accruing totaled $11 million at September 30, 2018 and $12 million at December 31, 2017.

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 have regulatory risk ratings of special mention, substandard or doubtful; classified credits are those that have regulatory risk ratings of 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. 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 monitored for credit quality based on regulatory risk ratings.

	September 30, 2018
			Criticized
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	23,602	$	404	$	760	$	24,766
Commercial mortgage	14,769		100		162		15,031
Construction	1,398		4		78		1,480
Total commercial portfolio	$	39,769	$	508	$	1,000	$	41,277

	December 31, 2017
			Criticized
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	23,632	$	435	$	747	$	24,814
Commercial mortgage	14,081		80		159		14,320
Construction	1,632		15		128		1,775
Total commercial portfolio	$	39,345	$	530	$	1,034	$	40,909

The Company monitors the credit quality of its consumer portfolio segment based primarily on payment status. The following tables summarize the loans in the consumer portfolio segment, which exclude $6 million and $8 million of loans covered by FDIC loss share agreements, at September 30, 2018 and December 31, 2017, respectively.

	September 30, 2018
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	37,944	$	111	$	38,055
Home equity and other consumer loans	4,295		20		4,315
Total consumer portfolio	$	42,239	$	131	$	42,370

	December 31, 2017
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	35,534	$	104	$	35,638
Home equity and other consumer loans	3,437		22		3,459
Total consumer portfolio	$	38,971	$	126	$	39,097

The Company also monitors the credit quality for substantially all of its consumer portfolio segment using credit scores provided by FICO and refreshed 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 data available for the property location. 

The following tables summarize the loans in the consumer portfolio segment based on refreshed FICO scores and refreshed LTV ratios at September 30, 2018 and December 31, 2017. These tables exclude loans covered by FDIC loss share agreements, as discussed above. The amounts presented reflect unpaid principal balances less partial charge-offs.

	September 30, 2018
	FICO scores
(Dollars in millions)	720 and Above			Below 720			No FICO Available(1)			Total
Residential mortgage	$	31,284		$	5,939		$	445		$	37,668
Home equity and other consumer loans	3,001			1,200			55			4,256
Total consumer portfolio	$	34,285		$	7,139		$	500		$	41,924
Percentage of total	82		%	17		%	1		%	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, 2017
	FICO scores
(Dollars in millions)	720 and Above			Below 720			No FICO Available(1)			Total
Residential mortgage	$	28,786		$	6,082		$	411		$	35,279
Home equity and other consumer loans	2,404			918			84			3,406
Total consumer portfolio	$	31,190		$	7,000		$	495		$	38,685
Percentage of total	81		%	18		%	1		%	100		%

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

	September 30, 2018
	LTV ratios
(Dollars in millions)	Less than or Equal to 80 Percent			Greater than 80 and Less than 100 Percent			Greater than or Equal to 100 Percent			No LTV Available(1)			Total
Residential mortgage	$	36,985		$	654		$	4		$	25		$	37,668
Home equity loans	1,979			215			12			28			2,234
Total consumer portfolio	$	38,964		$	869		$	16		$	53		$	39,902
Percentage of total	98		%	2		%	—		%	—		%	100		%

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

	December 31, 2017
	LTV ratios
(Dollars in millions)	Less than or Equal to 80 Percent			Greater than 80 and Less than 100 Percent			Greater than or Equal to 100 Percent			No LTV Available(1)			Total
Residential mortgage	$	34,472		$	771		$	4		$	32		$	35,279
Home equity loans	2,052			248			24			33			2,357
Total consumer portfolio	$	36,524		$	1,019		$	28		$	65		$	37,636
Percentage of total	97		%	3		%	—		%	—		%	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 September 30, 2018 and December 31, 2017. The summary includes those TDRs that are on nonaccrual status and those that continue to accrue interest. The Company had $39 million and $66 million in commitments to lend additional funds to borrowers with loan modifications classified as TDRs as of September 30, 2018 and December 31, 2017, respectively.

(Dollars in millions)	September 30, 2018		December 31, 2017
Commercial and industrial	$	253	$	202
Commercial mortgage	53		7
Construction	78		128
Total commercial portfolio	384		337
Residential mortgage	200		215
Home equity and other consumer loans	22		25
Total consumer portfolio	222		240
Total restructured loans	$	606	$	577

For the third quarter of 2018, TDR modifications in the commercial portfolio segment were substantially composed of interest rate changes, maturity extensions, forbearance, conversions from revolving lines of credit to term loans, or some combination thereof. In the consumer portfolio segment, modifications were primarily composed of maturity extensions. Charge-offs related to TDR modifications for the nine months ended September 30, 2018 and September 30, 2017 were de minimis. For the commercial and consumer portfolio segments, the allowance for loan losses for TDRs was measured on an individual loan basis or in pools with similar risk characteristics.

The following tables provide the pre- and post-modification outstanding recorded investment amounts of TDRs as of the date of the restructuring that occurred during the three and nine months ended September 30, 2018 and 2017.

	For the Three Months Ended September 30, 2018				For the Nine Months Ended September 30, 2018
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)		Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	59	$	59	$	163	$	163
Total commercial portfolio	59		59		163		163
Residential mortgage	4		4		6		6
Home equity and other consumer loans	1		1		2		2
Total consumer portfolio	5		5		8		8
Total	$	64	$	64	$	171	$	171

(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.

	For the Three Months Ended September 30, 2017				For the Nine Months Ended September 30, 2017
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)		Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	20	$	20	$	116	$	116
Commercial mortgage	2		2		3		3
Construction	—		—		61		61
Total commercial portfolio	22		22		180		180
Residential mortgage	6		6		14		14
Home equity and other consumer loans	—		—		2		2
Total consumer portfolio	6		6		16		16
Total	$	28	$	28	$	196	$	196

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

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

The following tables provide the recorded investment amounts of TDRs at the date of default, for which there was a payment default during the three and nine months ended September 30, 2018 and 2017, and where the default occurred within the first twelve months after modification into a TDR. A payment default is defined as the loan being 60 days or more past due.

(Dollars in millions)	For the Three Months Ended September 30, 2018		For the Nine Months Ended September 30, 2018
Residential mortgage	$	—	$	2
Total consumer portfolio	—		2
Total	$	—	$	2

(Dollars in millions)	For the Three Months Ended September 30, 2017		For the Nine Months Ended September 30, 2017
Commercial and industrial	$	—	$	19
Commercial mortgage	—		1
Total commercial portfolio	—		20
Residential mortgage	1		2
Total consumer portfolio	1		2
Total	$	1	$	22

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

Loan Impairment

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

The following tables show information about impaired loans by class as of September 30, 2018 and December 31, 2017.

	September 30, 2018
	Recorded Investment								Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total		Allowance for Impaired Loans		With an Allowance		Without an Allowance
Commercial and industrial	$	321	$	22	$	343	$	112	$	372	$	91
Commercial mortgage	24		53		77		—		24		53
Construction	70		7		77		4		70		7
Total commercial portfolio	415		82		497		116		466		151
Residential mortgage	180		73		253		13		190		87
Home equity and other consumer loans	23		13		36		—		23		22
Total consumer portfolio	203		86		289		13		213		109
Total	$	618	$	168	$	786	$	129	$	679	$	260

	December 31, 2017
	Recorded Investment								Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total		Allowance for Impaired Loans		With an Allowance		Without an Allowance
Commercial and industrial	$	287	$	93	$	380	$	57	$	348	$	102
Commercial mortgage	33		3		36		1		33		3
Construction	—		128		128		—		—		128
Total commercial portfolio	320		224		544		58		381		233
Residential mortgage	218		59		277		15		234		69
Home equity and other consumer loans	29		15		44		—		30		24
Total consumer portfolio	247		74		321		15		264		93
Total	$	567	$	298	$	865	$	73	$	645	$	326

The following table presents the average recorded investment in impaired loans and the amount of interest income recognized for impaired loans during the three and nine months ended September 30, 2018 and 2017 for the commercial and consumer loans portfolio segments.

	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2018				2017				2018				2017
(Dollars in millions)	Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income
Commercial and industrial	$	329	$	3	$	397	$	4	$	306	$	8	$	466	$	15
Commercial mortgage	79		5		96		11		56		23		94		33
Construction	78		3		9		2		106		7		12		3
Total commercial portfolio	486		11		502		17		468		38		572		51
Residential mortgage	257		3		305		3		264		10		310		10
Home equity and other consumer loans	36		—		53		1		39		2		55		5
Total consumer portfolio	293		3		358		4		303		12		365		15
Total	$	779	$	14	$	860	$	21	$	771	$	50	$	937	$	66

The following table presents loan transfers from held to investment to held for sale and proceeds from

sales of loans during the three and nine months ended September 30, 2018 and 2017 for the commercial and consumer loans portfolio segments.

	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2018				2017				2018				2017
(Dollars in millions)	Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale			Proceeds from Sale
Commercial portfolio	$	77	$	49	$	477	$	105	$	10	$	563	$	837		$	751
Consumer portfolio	—		—		—		—		—		—		(4		)	—
Total	$	77	$	49	$	477	$	105	$	10	$	563	$	833		$	751

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Variable Interest Entities

9 Months Ended

Sep. 30, 2018

Variable Interest Entities

Variable Interest Entities

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 sheets at September 30, 2018 and December 31, 2017.

	September 30, 2018
	Consolidated Assets								Consolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities
LIHC investments	$	—	$	—	$	48	$	48	$	—	$	—
Leasing investments	—		569		140		709		14		14
Total consolidated VIEs	$	—	$	569	$	188	$	757	$	14	$	14

	December 31, 2017
	Consolidated Assets								Consolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities
LIHC investments	$	—	$	—	$	68	$	68	$	—	$	—
Leasing investments	1		583		158		742		24		24
Total consolidated VIEs	$	1	$	583	$	226	$	810	$	24	$	24

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 the 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 energy, 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 investments.

Unconsolidated VIEs

The following tables present the Company’s carrying amounts related to the unconsolidated VIEs at September 30, 2018 and December 31, 2017. The tables also present 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. During the nine months endedSeptember 30, 2018 and September 30, 2017, the Company had noncash increases in unfunded commitments on LIHC investments of $45 million and $22 million, respectively, included within other liabilities.

	September 30, 2018
	Unconsolidated Assets										Unconsolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Securities Available for Sale		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	—	$	28	$	236	$	971	$	1,235	$	176	$	176	$	1,235
Leasing investments	30		—		21		1,453		1,504		44		44		1,525
Other investments	—		—		5		34		39		—		—		80
Total unconsolidated VIEs	$	30	$	28	$	262	$	2,458	$	2,778	$	220	$	220	$	2,840

	December 31, 2017
	Unconsolidated Assets										Unconsolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Securities Available for Sale		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	—	$	29	$	228	$	1,028	$	1,285	$	254	$	254	$	1,284
Leasing investments	1		—		24		1,745		1,770		53		53		1,792
Other investments	—		—		24		26		50		—		—		132
Total unconsolidated VIEs	$	1	$	29	$	276	$	2,799	$	3,105	$	307	$	307	$	3,208

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 or partnerships, and therefore is not considered the primary beneficiary and does not consolidate these investments.

The following table presents the impact of the unconsolidated LIHC investments on our consolidated statements of income for the three and nine months endedSeptember 30, 2018 and 2017.

	For the Three Months Ended				For the Nine Months Ended
	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
(Dollars in millions)
Losses from LIHC investments included in other noninterest expense	$	2	$	4	$	6	$	8
Amortization of LIHC investments included in income tax expense	34		37		102		106
Tax credits and other tax benefits from LIHC investments included in income tax expense	39		49		130		141

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 third party sponsors. 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 significant activities of the LLCs, and therefore is not considered the primary beneficiary and does not consolidate these investments.

Other Investments

The Company has other 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 investments.

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Securities Financing Arrangements

9 Months Ended

Sep. 30, 2018

Transfers and Servicing [Abstract]

Securities Financing Arrangements

Securities Financing Arrangements

The Company enters into securities purchased under agreements to resell, securities sold under agreements to repurchase, securities borrowed and securities loaned transactions. The Company executes these transactions to facilitate customer match-book activity, cover short positions and fund the Company's trading inventory. The Company manages credit exposure from certain transactions by entering into master netting agreements and collateral arrangements with counterparties. The relevant agreements allow for the efficient closeout of the transaction, liquidation and set-off of collateral against the net amount owed by the counterparty following a default. Under these agreements and transactions, the Company either receives or provides collateral. The Company receives collateral in the form of securities in connection with reverse repurchase agreements and securities borrowed transactions. In many cases, the Company is permitted to sell or repledge these securities held as collateral and use the securities to secure repurchase agreements or enter into securities lending transactions. In certain cases the Company may agree for collateral to be posted to a third party custodian under a tri-party arrangement that enables the Company to take control of such collateral in the event of a counterparty default. Default events generally include, among other things, failure to pay, insolvency or bankruptcy of a counterparty. For additional information related to securities pledged and received as collateral, see Note 2 "Securities".

The following tables present the gross obligations for securities sold under agreements to repurchase and securities loaned by remaining contractual maturity and class of collateral pledged at September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Overnight and Continuous		Up to 30 Days		31 - 90 Days		Greater than 90 Days		Total
Securities sold under agreements to repurchase:
U.S. Treasury securities	$	12,283	$	648	$	313	$	250	$	13,494
U.S. government-sponsored agency securities	119		166		16		—		301
Money market securities	—		—		289		—		289
Asset-backed securities	—		—		242		—		242
Mortgage-backed securities	8,808		2,325		6,709		1,150		18,992
Corporate bonds	1,346		131		813		—		2,290
State and municipal securities	44		66		394		—		504
Equity securities	249		3		274		—		526
Total	$	22,849	$	3,339	$	9,050	$	1,400	$	36,638
Securities loaned:
U.S. Treasury securities	$	—	$	170	$	41	$	—	$	211
Equity securities	285		—		—		—		285
Total	$	285	$	170	$	41	$	—	$	496

	December 31, 2017
(Dollars in millions)	Overnight and Continuous		Up to 30 Days		31 - 90 Days		Greater than 90 Days		Total
Securities sold under agreements to repurchase:
U.S. Treasury securities	$	8,244	$	2,370	$	1,046	$	1,158	$	12,818
U.S. government-sponsored agency securities	115		38		63		—		216
Other sovereign government obligations	—		—		4		—		4
Money market securities	1		—		6		—		7
Asset-backed securities	32		—		164		—		196
Mortgage-backed securities	8,322		4,972		5,859		250		19,403
Corporate bonds	580		620		1,125		—		2,325
State and municipal securities	283		—		276		—		559
Equity securities	416		376		189		—		981
Total	$	17,993	$	8,376	$	8,732	$	1,408	$	36,509
Securities loaned:
Corporate bonds	$	—	$	322	$	—	$	—	$	322
Equity securities	446		10		101		—		557
Total	$	446	$	332	$	101	$	—	$	879

Offsetting Financial Assets and Liabilities

The Company primarily enters into derivative contracts, repurchase agreements and securities lending agreements with counterparties utilizing standard International Swaps and Derivatives Association Master Agreements and Credit Support Annex Agreements, Master Repurchase Agreements, and Master Securities Lending Agreements, respectively. These agreements 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 at September 30, 2018 and December 31, 2017.

	September 30, 2018
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative assets	$	772	$	306	$	466	$	18	$	—	$	448
Securities borrowed or purchased under resale agreements	31,367		10,102		21,265		21,179		—		86
Total	$	32,139	$	10,408	$	21,731	$	21,197	$	—	$	534
Financial Liabilities:
Derivative liabilities	$	863	$	309	$	554	$	50	$	—	$	504
Securities loaned or sold under repurchase agreements	37,134		10,102		27,032		26,250		—		782
Total	$	37,997	$	10,411	$	27,586	$	26,300	$	—	$	1,286

	December 31, 2017
							Gross Amounts Not Offset in Balance Sheet
(Dollars in millions)	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet		Financial Instruments		Cash Collateral Received/Pledged		Net Amount
Financial Assets:
Derivative assets	$	1,322	$	607	$	715	$	25	$	—	$	690
Securities borrowed or purchased under resale agreements	31,845		10,951		20,894		20,816		—		78
Total	$	33,167	$	11,558	$	21,609	$	20,841	$	—	$	768
Financial Liabilities:
Derivative liabilities	$	1,127	$	620	$	507	$	142	$	—	$	365
Securities loaned or sold under repurchase agreements	37,388		10,951		26,437		25,639		—		798
Total	$	38,515	$	11,571	$	26,944	$	25,781	$	—	$	1,163

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Commercial Paper and Other Short-Term Borrowings

9 Months Ended

Sep. 30, 2018

Short-term Debt [Abstract]

Commercial Paper and Other Short-Term Borrowings

Commercial Paper and Other Short-Term Borrowings

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

(Dollars in millions)	September 30, 2018		December 31, 2017
Debt issued by MUB
Commercial paper, with a weighted average interest rate of 2.08% and 1.26% at September 30, 2018 and December 31, 2017, respectively	$	293	$	347
Federal Home Loan Bank advances, with a weighted average interest rate of 2.22% and 1.42% at September 30, 2018 and December 31, 2017, respectively	7,000		5,750
Total debt issued by MUB	7,293		6,097
Debt issued by other MUAH subsidiaries
Short-term debt due to MUFG Bank, Ltd., with weighted average interest rates of 2.67% and 1.88% at September 30, 2018 and December 31, 2017, respectively	150		168
Short-term debt due to affiliates, with weighted average interest rates of (-0.07)% and (-0.09)% at September 30, 2018 and December 31, 2017, respectively	866		801
Total debt issued by other MUAH subsidiaries	1,016		969
Total commercial paper and other short-term borrowings	$	8,309	$	7,066

Short-term debt due to MUFG Bank, Ltd. consists of both secured and unsecured fixed and floating rate borrowings.

MUSA maintains an uncommitted, unsecured lending facility with Mitsubishi UFJ Securities Holdings Co., Ltd. under which it may borrow up to JPY 160 billion (USD 1.4 billion equivalent). Under the terms of the facility, MUSA can choose to borrow in Japanese Yen or U.S. Dollars. Japanese Yen denominated borrowings include an extension option allowing MUSA to extend the maturity of an individual draw by 100 days at any time prior to its original, stated maturity. At September 30, 2018, MUSA had JPY 98 billion (USD 866 million equivalent) drawn under this facility.

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Long-Term Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

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)	September 30, 2018		December 31, 2017
Debt issued by MUAH
Senior debt:
Floating rate senior notes due February 2018. These notes, which bore interest at 0.57% above 3-month LIBOR, had a rate of 1.97% at December 31, 2017	$	—	$	250
Fixed rate 1.625% notes due February 2018	—		450
Fixed rate 2.25% notes due February 2020	999		998
Fixed rate 3.50% notes due June 2022	398		398
Fixed rate 3.00% notes due February 2025	496		496
Senior debt due to MUFG Bank, Ltd:
Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 3.19% at September 30, 2018 and 2.45% at December 31, 2017	545		545
Floating rate debt due September 2020. This note, which bears interest at 0.85% above 3-month LIBOR, had a rate of 3.18% at September 30, 2018 and 2.54% at December 31, 2017	3,500		3,500
Floating rate debt due December 2023. This note, which bears interest at 0.76% above 3-month EURIBOR, had a rate of .76% at September 30, 2018 and 0.76% at December 31, 2017	24		24
Subordinated debt due to MUFG Bank, Ltd:
Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 3.71% at September 30, 2018 and 3.07% at December 31, 2017	300		300
Junior subordinated debt payable to trusts:
Floating rate note due September 2036. This note had an interest rate of 4.03% at September 30, 2018 and 3.29% at December 31, 2017	36		36
Total debt issued by MUAH	6,298		6,997
Debt issued by MUB
Senior debt:
Fixed rate 2.63% notes due September 2018	—		1,000
Fixed rate 2.25% notes due May 2019	497		497
Fixed rate FHLB of San Francisco advances due between October 2018 and June 2020. These notes bear a combined weighted average rate of 2.12% at September 30, 2018 and 1.51% at December 31, 2017	4,900		1,500
Subordinated debt due to MUFG Bank, Ltd:
Floating rate subordinated debt due June 2023. This note, which bore interest at 1.20% above 3-month LIBOR, had a rate of 2.89% at December 31, 2017	—		750
Other	28		63
Total debt issued by MUB	5,425		3,810
Debt issued by other MUAH subsidiaries
Senior debt due to MUFG Bank, Ltd:
Various floating rate borrowings due between December 2020 and May 2021. These notes, which bear interest above 3-month LIBOR had a weighted average interest rate of 2.39% at September 30, 2018 and 1.78% at December 31, 2017	250		291
Various fixed rate borrowings due between February 2019 and May 2024 with a weighted average interest rate of 1.82% (between 0.14% and 2.44%) at September 30, 2018 and 2.12% (between 1.37% and 2.65%) at December 31, 2017	264		339
Subordinated debt due to Affiliate:
Various floating rate borrowings due between September 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had an interest rate of 4.13% at September 30, 2018 and 2.95% (between 2.88% and 3.04%) at December 31, 2017	75		185

Non-recourse debt due to MUFG Bank, Ltd:
Various floating rate non-recourse borrowings due between November 2018 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.83% (between 3.49% and 4.48%) at September 30, 2018 and 3.07% (between 1.49% and 5.58%) at December 31, 2017	77		79
Fixed rate non-recourse borrowings due between January 2019 and July 2023 which had an interest rate of 3.06% at September 30, 2018 and 3.27% at December 31, 2017	195		240
Other non-recourse debt:
Various floating rate non-recourse borrowings due between February 2019 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.64% (between 3.34% and 4.23%) at September 30, 2018 and 2.88% (between 2.50% and 3.54%) at December 31, 2017	178		185
Fixed rate non-recourse borrowings due December 2026 which had an interest rate of 5.34% at September 30, 2018 and December 31, 2017	34		36
Total debt issued by other MUAH subsidiaries	1,073		1,355
Total long-term debt	$	12,796	$	12,162

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Fair Value Measurement and Fair Value of Financial Instruments

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement and Fair Value of Financial Instruments

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 assets and liabilities. For additional information related to the valuation methodologies used for certain financial assets and financial liabilities measured at fair value, and information about the Company's valuation processes, see Note 11 "Fair Value Measurement and Fair Value of Financial Instruments" to our Consolidated Financial Statements in Part II, Item 8. “Financial Statements and Supplementary Data” in our 2017 Form 10-K.

Fair Value Hierarchy

In determining fair value, the Company maximizes the use of observable market inputs and minimizes the use of unobservable inputs. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect the Company’s estimate about market data. Based on the observability of the significant inputs used, the Company classifies its fair value measurements in accordance with the three-level hierarchy as defined by GAAP. This hierarchy is based on the quality, observability and reliability of the information used to determine fair value. 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. For additional information related to the fair value hierarchy, see Note 11 "Fair Value Measurement and Fair Value of Financial Instruments" to our Consolidated Financial Statements in Part II, Item 8. “Financial Statements and Supplementary Data” in our 2017 Form 10-K.

Fair Value Measurements on a Recurring Basis

The following tables present financial assets and financial liabilities measured at fair value on a recurring basis at September 30, 2018 and December 31, 2017, by major category and by valuation hierarchy level.

	September 30, 2018
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets(2):
U.S. Treasury securities	$	—		$	2,968		$	—		$	—		$	2,968
U.S. government-sponsored agency securities	—			115			—			—			115
State and municipal securities	—			11			—			—			11
Commercial paper	—			335			—			—			335
Corporate bonds	—			1,428			—			—			1,428
Asset-backed securities	—			262			—			—			262
Mortgage-backed securities	—			5,511			—			—			5,511
Equities	122			—			—			—			122
Interest rate derivative contracts	32			422			—			(121		)	333
Commodity derivative contracts	—			42			—			(28		)	14
Foreign exchange derivative contracts	1			226			—			(117		)	110
Equity derivative contracts	1			—			43			(40		)	4
Total trading account assets	156			11,320			43			(306		)	11,213
Securities available for sale(3):
Asset Liability Management securities:
U.S. Treasury	—			3,730			—			—			3,730
Residential mortgage-backed securities:
U.S government and government-sponsored agencies	—			8,501			—			—			8,501
Privately issued	—			861			—			—			861
Privately issued - commercial mortgage-backed securities	—			1,078			—			—			1,078
Collateralized loan obligations	—			1,434			—			—			1,434
Other	—			4			—			—			4
Other debt securities:
Direct bank purchase bonds	—			—			1,281			—			1,281
Other	—			44			144			—			188
Total securities available for sale	—			15,652			1,425			—			17,077
Other assets:
Mortgage servicing rights(2)	—			—			176			—			176
Interest rate hedging contracts(3)	—			4			—			—			4
Other derivative contracts(2)	—			1			—			—			1
Equity securities(2)	9			—			—			—			9
Total other assets	9			5			176			—			190
Total assets	$	165		$	26,977		$	1,644		$	(306	)	$	28,480
Percentage of total	—		%	95		%	6		%	(1		)%	100		%
Percentage of total Company assets	—			17			1			—			18
Liabilities
Trading account liabilities(2):
Securities sold, not yet purchased:
U.S. Treasury	$	—		$	2,518		$	—		$	—		$	2,518
Commercial paper	—			22			—			—			22
Corporate bonds	—			853			—			—			853
Equities	88			—			—			—			88
Trading derivatives:
Interest rate derivative contracts	3			627			—			(217		)	413
Commodity derivative contracts	—			33			—			(24		)	9
Foreign exchange derivative contracts	1			127			—			(49		)	79
Equity derivative contracts	4			—			43			—			47
Total trading account liabilities	96			4,180			43			(290		)	4,029
Other liabilities:
FDIC clawback liability(2)	—			—			115			—			115
Other derivative contracts(2)	—			21			4			(19		)	6
Total other liabilities	—			21			119			(19		)	121
Total liabilities	$	96		$	4,201		$	162		$	(309	)	$	4,150
Percentage of total	2		%	101		%	4		%	(7		)%	100		%
Percentage of total Company liabilities	—			3			—			—			3

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

(2) Fair value through net income.

(3) Fair value through other comprehensive income.

	December 31, 2017
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets(2):
U.S. Treasury securities	$	—		$	1,926		$	—		$	—		$	1,926
U.S. government-sponsored agency securities	—			118			—			—			118
State and municipal securities	—			11			—			—			11
Commercial paper	—			7			—			—			7
Other sovereign government obligations	—			8			—			—			8
Corporate bonds	—			1,054			—			—			1,054
Asset-backed securities	—			199			—			—			199
Mortgage-backed securities	—			6,339			—			—			6,339
Equities	193			—			—			—			193
Interest rate derivative contracts	7			870			1			(353		)	525
Commodity derivative contracts	—			50			—			(49		)	1
Foreign exchange derivative contracts	—			249			1			(68		)	182
Equity derivative contracts	2			—			137			(135		)	4
Total trading account assets	202			10,831			139			(605		)	10,567
Securities available for sale(3):
Asset Liability Management securities:
U.S. Treasury	—			3,252			—			—			3,252
Residential mortgage-backed securities:
U.S government and government-sponsored agencies	—			9,208			—			—			9,208
Privately issued	—			694			—			—			694
Privately issued - commercial mortgage-backed securities	—			822			—			—			822
Collateralized loan obligations	—			1,905			—			—			1,905
Other	—			5			—			—			5
Other debt securities:
Direct bank purchase bonds	—			—			1,503			—			1,503
Other	—			68			96			—			164
Equity securities	10			—			—			—			10
Total securities available for sale	10			15,954			1,599			—			17,563
Other assets:
Mortgage servicing rights(2)	—			—			64			—			64
Interest rate hedging contracts(3)	—			2			—			—			2
Other derivative contracts(2)	—			2			1			(2		)	1
Total other assets	—			4			65			(2		)	67
Total assets	$	212		$	26,789		$	1,803		$	(607	)	$	28,197
Percentage of total	1		%	95		%	6		%	(2		)%	100		%
Percentage of total Company assets	—			17			1			—			18
Liabilities
Trading account liabilities(2):
Securities sold, not yet purchased:
U.S. Treasury	$	—		$	2,709		$	—		$	—		$	2,709
Other sovereign government obligations	—			7			—			—			7
Corporate bonds	—			348			—			—			348
Equities	35			—			—			—			35
Trading derivatives:
Interest rate derivative contracts	3			643			—			(382		)	264
Commodity derivative contracts	—			33			—			(20		)	13
Foreign exchange derivative contracts	1			144			1			(66		)	80
Equity derivative contracts	7			—			137			—			144
Total trading account liabilities	46			3,884			138			(468		)	3,600
Other liabilities:
FDIC clawback liability(2)	—			—			113			—			113
Interest rate hedging contracts(3)	—			149			—			(149		)	—
Other derivative contracts(2)	—			3			6			(3		)	6
Total other liabilities	—			152			119			(152		)	119
Total liabilities	$	46		$	4,036		$	257		$	(620	)	$	3,719
Percentage of total	1		%	109		%	7		%	(17		)%	100		%
Percentage of total Company liabilities	—			3			—			—			3

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

(2) Fair value through net income.

(3) Fair value through other comprehensive income.

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 three and nine months ended September 30, 2018 and 2017. Level 3 available for sale securities at September 30, 2018 and 2017 primarily consist of direct bank purchase bonds.

	For the Three Months Ended
	September 30, 2018														September 30, 2017
(Dollars in millions)	Trading Account Assets			Securities Available for Sale			Other Assets		Trading Account Liabilities			Other Liabilities			Trading Account Assets			Securities Available for Sale			Other Assets			Trading Account Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	50		$	1,495		$	149	$	(49	)	$	(119	)	$	171		$	1,572		$	49		$	(169	)	$	(118	)
Total gains (losses) - realized/unrealized:
Included in income before taxes	6			—			2		(7		)	—			17			—			(1		)	(17		)	(1		)
Included in other comprehensive income	—			(1		)	—		—			—			—			3			—			—			—
Purchases/additions	—			52			25		—			—			—			4			9			—			—
Settlements	(13		)	(121		)	—		13			—			(24		)	(10		)	—			24			—
Asset (liability) balance, end of period	$	43		$	1,425		$	176	$	(43	)	$	(119	)	$	164		$	1,569		$	57		$	(162	)	$	(119	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	6		$	—		$	2	$	(7	)	$	—		$	17		$	—		$	(1	)	$	(17	)	$	(1	)

	For the Nine Months Ended
	September 30, 2018														September 30, 2017
(Dollars in millions)	Trading Account Assets			Securities Available for Sale			Other Assets		Trading Account Liabilities			Other Liabilities			Trading Account Assets			Securities Available for Sale			Other Assets			Trading Account Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	139		$	1,600		$	65	$	(138	)	$	(119	)	$	168		$	1,638		$	24		$	(166	)	$	(121	)
Total gains (losses) - realized/unrealized):
Included in income before taxes	—			—			11		(1		)	—			58			—			(3		)	(57		)	2
Included in other comprehensive income	—			(18		)	—		—			—			—			15			—			—			—
Purchases/additions	—			125			100		—			—			—			6			36			—			—
Settlements	(96		)	(282		)	—		96			—			(62		)	(90		)	—			61			—
Asset (liability) balance, end of period	$	43		$	1,425		$	176	$	(43	)	$	(119	)	$	164		$	1,569		$	57		$	(162	)	$	(119	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	—		$	—		$	11	$	(1	)	$	—		$	58		$	—		$	(3	)	$	(57	)	$	2

The following table presents information about significant unobservable inputs related to the Company’s significant Level 3 assets and liabilities at September 30, 2018.

	September 30, 2018
(Dollars in millions)	Level 3 Fair Value		Valuation Technique	Significant Unobservable Input(s)	Range of Inputs		Weighted Average
Securities available for sale:
Direct bank purchase bonds	$	1,281	Return on equity	Market-required return on capital	8.0 - 10.0	%	9.5	%
				Probability of default	0.0 - 25.0		0.3
				Loss severity	10.0 - 60.0		24.3

The direct bank purchase bonds generally 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.

Fair Value Measurement on a Nonrecurring Basis

Certain assets may be measured at fair value in certain situations, such as impairment, and these measurements are referred to as nonrecurring. For assets measured at fair value on a nonrecurring basis during the three and nine months ended September 30, 2018 and 2017 that were still held on the consolidated balance sheet as of the respective periods ended, the following tables present the fair value of such assets by the level of valuation assumptions used to determine each fair value adjustment.

	September 30, 2018								For the Three Months Ended September 30, 2018			For the Nine Months Ended September 30, 2018
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3		Gains (Losses)			Gains (Losses)
Loans held for investment
Impaired loans	$	183	$	—	$	—	$	183	$	(59	)	$	(73	)
Other assets
Software	—		—		—		—		(1		)	(3		)
Private equity investments	10		—		—		10		—			(2		)
Renewable energy investment	2		—		—		2		—			(2		)
Consolidated LIHC VIE	48		—		—		48		—			(8		)
Total	$	243	$	—	$	—	$	243	$	(60	)	$	(88	)

	September 30, 2017								For the Three Months Ended September 30, 2017			For the Nine Months Ended September 30, 2017
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3		Gains (Losses)			Gains (Losses)
Loans held for investment
Impaired loans	$	97	$	—	$	—	$	97	$	(21	)	$	(42	)
Other assets
Software	—		—		—		—		(1		)	(4		)
Loans held for sale	7		—		—		7		(1		)	(3		)
Renewable energy investment	—		—		—		—		—			2
Consolidated LIHC VIE	81		—		—		81		(3		)	(11		)
Total	$	185	$	—	$	—	$	185	$	(26	)	$	(58	)

Fair Value of Financial Instruments Disclosures

The tables below present the carrying amount and estimated fair value of certain financial instruments, all of which are accounted for at amortized cost, classified by valuation hierarchy level at September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	4,192	$	4,192	$	4,192	$	—	$	—
Securities borrowed or purchased under resale agreements	21,265		21,262		—		21,262		—
Securities held to maturity	11,320		10,972		—		10,972		—
Loans held for investment(1)	81,765		81,445		—		—		81,445
Other assets	18		18		18		—		—
Liabilities
Time deposits	$	9,957	$	9,899	$	—	$	9,899	$	—
Securities loaned or sold under repurchase agreements	27,032		27,030		—		27,030		—
Commercial paper and other short-term borrowings	8,309		8,309		—		8,309		—
Long-term debt	12,796		12,764		—		12,764		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	102	$	230	$	—	$	—	$	230

(1) Excludes lease financing. The carrying amount is net of the allowance for loan losses.

	December 31, 2017
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	3,392	$	3,392	$	3,392	$	—	$	—
Securities borrowed or purchased under resale agreements	20,894		20,894		—		20,894		—
Securities held to maturity	9,885		9,799		—		9,799		—
Loans held for investment(1)	78,023		79,051		—		—		79,051
Liabilities
Deposits	$	84,787	$	84,743	$	—	$	84,743	$	—
Securities loaned or sold under repurchase agreements	26,437		26,437		—		26,437		—
Commercial paper and other short-term borrowings	7,066		7,066		—		7,066		—
Long-term debt	12,162		12,162		—		12,162		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	174	$	174	$	—	$	—	$	174

(1) Excludes lease financing. The carrying amount is net of the allowance for loan losses.

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Derivative Instruments and Other Financial Instruments Used For Hedging

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Other Financial Instruments Used For Hedging

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. 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 credit support annex agreements. Additionally, the Company considers counterparty credit quality and the creditworthiness of the Company in estimating the fair value of derivative instruments.

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 as hedging instruments at September 30, 2018 and December 31, 2017. Asset and liability values are presented gross, excluding the impact of legally enforceable master netting and credit support annex 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.

	September 30, 2018						December 31, 2017
			Fair Value						Fair Value
(Dollars in millions)	Notional Amount		Asset Derivatives		Liability Derivatives		Notional Amount		Asset Derivatives		Liability Derivatives
Derivative instruments
Cash flow hedges:
Interest rate contracts	$	179	$	4	$	—	$	6,998	$	2	$	149
Fair value hedges:
Interest rate contracts	—		—		—		500		—		—
Not designated as hedging instruments:
Trading:
Interest rate contracts	120,613		454		630		132,214		878		646
Commodity contracts	453		42		33		1,244		50		33
Foreign exchange contracts	8,099		227		128		7,053		250		146
Equity contracts	503		44		47		1,496		139		144
Other contracts	39		—		—		4		—		—
Total Trading	129,707		767		838		142,011		1,317		969
Other risk management	1,232		1		25		1,345		3		9
Total derivative instruments	$	131,118	$	772	$	863	$	150,854	$	1,322	$	1,127

We recognized net losses of $28 million and $26 million on other risk management derivatives for the three and nine months ended September 30, 2018, respectively, and net losses of $3 million and $9 million for the three and nine months ended September 30, 2017, 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 and debt issuances. Derivatives that qualify for hedge accounting are designated as either fair value or cash flow hedges.

Cash Flow Hedges

From time to time, the Company uses interest rate swaps to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed loans, and to a lesser extent, to hedge interest rate risk on rollover debt. 

The Company used interest rate swaps with an aggregate notional amount of $179 million at September 30, 2018 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed short-term borrowings. At September 30, 2018, the weighted average remaining life of the active cash flow hedges was 1.9 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 noninterest expense in the period in which they arise. At September 30, 2018, the Company expects to reclassify approximately $81 million of losses from AOCI as a reduction to net interest income during the twelve months ending September 30, 2019. This amount could differ from amounts actually realized due to changes in interest rates, hedge terminations and the addition of other hedges subsequent to September 30, 2018.

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 stockholders' equity for derivatives designated as cash flow hedges for the three and nine months ended September 30, 2018 and 2017.

	Gains (Losses) Recognized in OCI (Effective Portion)					Gains (Losses) Reclassified from AOCI into Income (Effective Portion)						(Gains) Losses Recognized in Income (Ineffective Portion)
	For the Three Months Ended September 30,					For the Three Months Ended September 30,						For the Three Months Ended September 30,
(Dollars in millions)	2018		2017		Location	2018			2017		Location	2018		2017
Derivatives in cash flow hedging relationships
					Interest income	$	(11	)	$	11
Interest rate contracts	$	—	$	6	Interest expense	—			—		Noninterest expense	$	—	$	—
Total	$	—	$	6		$	(11	)	$	11		$	—	$	—

	Gains (Losses) Recognized in OCI (Effective Portion)						Gains (Losses) Reclassified from AOCI into Income (Effective Portion)						Gains (Losses) Recognized in Income (Ineffective Portion)
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017		Location	2018			2017		Location	2018			2017
Derivatives in cash flow hedging relationships
						Interest income	$	(19	)	$	60
Interest rate contracts	$	(98	)	$	42	Interest expense	—			—		Noninterest expense	$	(1	)	$	3
Total	$	(98	)	$	42		$	(19	)	$	60		$	(1	)	$	3

Fair Value Hedges

The Company engages in an interest rate hedging strategy in which one or more interest rate swaps are associated with a specified interest bearing liability, in order to convert the liability from a fixed rate to a floating rate instrument. This strategy mitigates the changes in fair value of the hedged liability caused by changes in the designated benchmark interest rate, LIBOR.

For fair value hedges, any ineffectiveness is recognized in noninterest expense in the period in which it arises. The change in the fair value of the hedged item and the hedging instrument, to the extent completely effective, offset with no impact on earnings.

The following tables present the gains (losses) on the Company's fair value hedges and hedged item for the three and nine months ended September 30, 2018 and 2017.

	For the Three Months Ended September 30, 2018						For the Nine Months Ended September 30, 2018
(Dollars in millions)	Derivative		Hedged Item		Hedge Ineffectiveness		Derivative			Hedged Item		Hedge Ineffectiveness
Interest rate risk on long-term debt	$	—	$	—	$	—	$	(2	)	$	2	$	—
Total	$	—	$	—	$	—	$	(2	)	$	2	$	—

	For the Three Months Ended September 30, 2017							For the Nine Months Ended September 30, 2017
(Dollars in millions)	Derivative			Hedged Item		Hedge Ineffectiveness		Derivative			Hedged Item		Hedge Ineffectiveness
Interest rate risk on long-term debt	$	(1	)	$	1	$	—	$	(2	)	$	1	$	(1	)
Total	$	(1	)	$	1	$	—	$	(2	)	$	1	$	(1	)

Derivatives Not Designated as Hedging Instruments

Trading Derivatives

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

The following table presents the amount of the net gains and losses for derivative instruments classified as trading reported in the consolidated statements of income under the heading trading account activities for the three and nine months ended September 30, 2018 and 2017.

	Gains (Losses) Recognized in Income on Trading Derivatives					Gains (Losses) Recognized in Income on Trading Derivatives
	For the Three Months Ended					For the Nine Months Ended
(Dollars in millions)	September 30, 2018		September 30, 2017			September 30, 2018		September 30, 2017
Trading derivatives
Interest rate contracts	$	64	$	(11	)	$	194	$	(69	)
Equity contracts	5		—			23		—
Foreign exchange contracts	11		11			32		32
Commodity contracts	—		—			—		1
Total	$	80	$	—		$	249	$	(36	)

Offsetting Financial Assets and Liabilities

The Company primarily enters into derivative contracts with counterparties utilizing standard International Swaps and Derivatives Association Master Agreements and Credit Support Annex Agreements. These agreements 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. For additional information related to offsetting of financial assets and liabilities, see Note 5 "Securities Financing Arrangements".

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Accumulated Other Comprehensive Income

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Income

The following tables present the change in each of the components of accumulated other comprehensive income and the related tax effect of the change allocated to each component for the three and nine months endedSeptember 30, 2018 and 2017.

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended September 30, 2018
Cash flow hedge activities:
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	$	11		$	(3	)	$	8
Net change	11			(3		)	8
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	(70		)	19			(51		)
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(1		)	—			(1		)
Amortization of net unrealized (gains) losses on held to maturity securities	8			(2		)	6
Net change	(63		)	17			(46		)
Pension and other benefits:
Amortization of prior service credit(1)	(10		)	2			(8		)
Recognized net actuarial (gain) loss(1)	24			(6		)	18
Net change	14			(4		)	10
Net change in AOCI	$	(38	)	$	10		$	(28	)

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended September 30, 2017
Cash flow hedge activities:
Unrealized net gains (losses) on hedges arising during the period	$	6		$	(2	)	$	4
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	(11		)	4			(7		)
Net change	(5		)	2			(3		)
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	32			(14		)	18
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(6		)	2			(4		)
Less: accretion of fair value adjustment on securities available for sale	(1		)	—			(1		)
Amortization of net unrealized (gains) losses on held to maturity securities	6			(2		)	4
Net change	31			(14		)	17
Foreign currency translation adjustment	7			(3		)	4
Pension and other benefits:
Amortization of prior service credit(1)	(12		)	5			(7		)
Recognized net actuarial (gain) loss(1)	21			(7		)	14
Net change	9			(2		)	7
Other	1			—			1
Net change in AOCI	$	43		$	(17	)	$	26

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Nine Months Ended September 30, 2018
Cash flow hedge activities:
Unrealized net gains (losses) on hedges arising during the period	$	(98	)	$	26		$	(72	)
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	19			(5		)	14
Net change	(79		)	21			(58		)
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	(392		)	103			(289		)
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(4		)	1			(3		)
Amortization of net unrealized (gains) losses on held to maturity securities	20			(5		)	15
Net change	(376		)	99			(277		)
Foreign currency translation adjustment	(3		)	1			(2		)
Pension and other benefits:
Amortization of prior service credit(1)	(31		)	8			(23		)
Recognized net actuarial (gain) loss(1)	72			(19		)	53
Net change	41			(11		)	30
Other	(1		)	—			(1		)
Net change in AOCI	$	(418	)	$	110		$	(308	)

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Nine Months Ended September 30, 2017
Cash flow hedge activities:
Unrealized net gains (losses) on hedges arising during the period	$	42		$	(16	)	$	26
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	(60		)	23			(37		)
Net change	(18		)	7			(11		)
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	129			(52		)	77
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(15		)	6			(9		)
Less: accretion of fair value adjustment on securities available for sale	(1		)	—			(1		)
Amortization of net unrealized (gains) losses on held to maturity securities	15			(6		)	9
Net change	128			(52		)	76
Foreign currency translation adjustment	12			(5		)	7
Pension and other benefits:
Amortization of prior service credit (1)	(36		)	14			(22		)
Recognized net actuarial (gain) loss(1)	67			(25		)	42
Net change	31			(11		)	20
Other	1			—			1
Net change in AOCI	$	154		$	(61	)	$	93

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

The following tables present the change in accumulated other comprehensive loss balances.

For the Three Months Ended September 30, 2017 and 2018:
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Postretirement Benefits Adjustment			Other			Accumulated Other Comprehensive Income (Loss)
(Dollars in millions)
Balance, June 30, 2017	$	(85	)	$	(149	)	$	(19	)	$	(576	)	$	—		$	(829	)
Other comprehensive income (loss) before reclassifications	4			18			4			—			—			26
Amounts reclassified from AOCI	(7		)	(1		)	—			7			1			—
Balance, September 30, 2017	$	(88	)	$	(132	)	$	(15	)	$	(569	)	$	1		$	(803	)
Balance, June 30, 2018	$	(240	)	$	(464	)	$	—		$	(580	)	$	(1	)	$	(1,285	)
Other comprehensive income (loss) before reclassifications	—			(51		)	—			—			—			(51		)
Amounts reclassified from AOCI	8			5			—			10			—			23
Balance, September 30, 2018	$	(232	)	$	(510	)	$	—		$	(570	)	$	(1	)	$	(1,313	)

For the Nine Months Ended September 30, 2017 and 2018:
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Postretirement Benefits Adjustment			Other			Accumulated Other Comprehensive Income (Loss)
(Dollars in millions)
Balance, December 31, 2016	$	(77	)	$	(208	)	$	(22	)	$	(589	)	$	—		$	(896	)
Other comprehensive income (loss) before reclassifications	26			77			7			—			—			110
Amounts reclassified from AOCI	(37		)	(1		)	—			20			1			(17		)
Balance, September 30, 2017	$	(88	)	$	(132	)	$	(15	)	$	(569	)	$	1		$	(803	)
Balance, December 31, 2017	$	(174	)	$	(233	)	$	(19	)	$	(600	)	$	—		$	(1,026	)
Other comprehensive income (loss) before reclassifications	(72		)	(289		)	(2		)	—			(1		)	(364		)
Amounts reclassified from AOCI	14			12			—			30			—			56
Transfer to additional paid-in capital(1)	—			—			21			—			—			21
Balance, September 30, 2018	$	(232	)	$	(510	)	$	—		$	(570	)	$	(1	)	$	(1,313	)

(1) Transfer of accumulated foreign currency translation to additional paid-in capital resulted from the transfer of the Company's investment in a Canadian entity to MUFG Bank, Ltd. during the first quarter of 2018.

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Employee Pension and Other Postretirement Benefits

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Employee Pension and Other Postretirement Benefits

Employee Pension and Other Postretirement Benefits

The following tables summarize the components of net periodic benefit cost for the three and nine months ended September 30, 2018 and 2017. The components of net periodic benefit cost other than the service cost component are included in other noninterest expense in the income statement.

	Pension Benefits						Other Postretirement Benefits						Superannuation, SERP and ESBP
	For the Three Months Ended   September 30,						For the Three Months Ended   September 30,						For the Three Months Ended   September 30,
(Dollars in millions)	2018			2017			2018			2017			2018		2017
Components of net periodic benefit cost:
Service cost	$	21		$	18		$	—		$	1		$	—	$	—
Interest cost	25			25			2			2			1		1
Expected return on plan assets	(67		)	(64		)	(6		)	(5		)	—		—
Amortization of prior service credit	(7		)	(7		)	(3		)	(5		)	—		—
Recognized net actuarial loss	21			19			2			2			1		—
Total net periodic benefit (income) cost	$	(7	)	$	(9	)	$	(5	)	$	(5	)	$	2	$	1

	Pension Benefits						Other Postretirement Benefits						Superannuation, SERP and ESBP
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017			2018			2017			2018		2017
Components of net periodic benefit cost:
Service cost	$	60		$	53		$	3		$	4		$	—	$	—
Interest cost	75			75			6			6			2		2
Expected return on plan assets	(201		)	(191		)	(16		)	(14		)	—		—
Amortization of prior service credit	(20		)	(20		)	(11		)	(16		)	—		—
Recognized net actuarial loss	65			59			4			6			3		2
Total net periodic benefit (income) cost	$	(21	)	$	(24	)	$	(14	)	$	(14	)	$	5	$	4

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Commitments, Contingencies and Guarantees

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments, Contingencies and Guarantees

Commitments, Contingencies and Guarantees

The following table summarizes the Company's commitments.

(Dollars in millions)	September 30, 2018
Commitments to extend credit	$	34,125
Issued standby and commercial letters of credit	4,858
Commitments to enter into forward-starting resale agreements	1,300
Other commitments	493

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 are generally 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. The majority of these types of commitments have terms of 1 year or less. As of September 30, 2018, the carrying amount of the Company's standby and commercial letters of credit totaled $3 million. Estimated exposure to loss related to these commitments is covered by the allowance for losses on unfunded 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 collateralized financing activities, commitments to fund principal investments, other securities, and residual value guarantees.

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 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 September 30, 2018, there is no current exposure to loss under these contracts, and the maximum potential exposure to loss in the future was estimated at $35 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. 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, results of operations or liquidity.

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Business Segments

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Business Segments

Business Segments

The Company has four reportable segments: Regional Bank, U.S. Wholesale & Investment Banking, Transaction Banking, and MUSA. The Company uses various management accounting methodologies to measure the performance of its segments. Unlike 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 separate economic entities.

Methodologies that are applied to the measurement of segment profitability, which are enhanced from time to time, include a funds transfer pricing system, an activity-based costing methodology, other indirect costs and a methodology to allocate the provision for credit losses. In the second quarter of 2018, the Company began measuring the performance of its business segments by reporting revenues and expenses from products and services sold entirely within the business segment that manages the customer relationship. The Company previously applied a “market view” perspective in measuring the business segments, which reported revenues and expenses from products and services sold in both the business segment that provided the product and the business segment that managed the customer relationship. Prior period results have been revised to conform to the current period presentation.

The funds 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 between Corporate Treasury and the operating segments. A segment receives a credit from Corporate Treasury for its funding sources. Conversely, a segment is assigned a charge by Corporate Treasury to fund its assets. Certain indirect costs, such as operations and technology expense, are allocated to the segments based on an activity-based costing methodology. 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. During the normal course of business, the Company occasionally changes or updates its management accounting methodologies or organizational structure. Certain non-bank subsidiaries, including MUSA, are reported based on their GAAP results.

Regional Bank

The Regional Bank provides banking products and services to individuals, businesses, and trust customers through five lines of business.

Consumer Banking serves consumers and small businesses through 345 full-service branches, digital channels, call centers, ATMs and alliances with other financial institutions. Products and services include checking and deposit accounts; residential mortgage loans; consumer loans; home equity lines of credit; credit cards; bill and loan payment services; and merchant services.

Commercial Banking provides commercial and asset-based loans to clients across a wide range of industries with annual revenues up to $1 billion. Through partnerships with other areas of the Bank, Commercial Banking clients also have access to non-credit products and services including global treasury management, capital markets solutions, foreign exchange, interest rate risk and commodity risk management products and services.

Real Estate Industries serves professional real estate investors and developers with products such as construction loans, commercial mortgages, bridge financing and unsecured financing. Property types supported include apartment, office, retail, industrial and single-family residential on the West Coast and in select metropolitan areas across the country. Real Estate Industries also makes tax credit investments in affordable housing projects through its Community Development Finance unit. Through partnerships with other areas of the bank, Real Estate Industries clients also have access to non-credit products and services including global treasury management, capital markets solutions, foreign exchange, interest rate risk and commodity risk management products and services.

Wealth Markets serves corporate, institutional, non-profit and individual clients. Capabilities include Wealth Planning / Trust & Estate Services; Investment Management through HighMark Capital Management, Inc., an SEC-registered investment advisory firm wholly-owned by the bank; Brokerage through UnionBanc Investment Services, LLC, an SEC-registered broker-dealer/investment advisory firm wholly-owned by the bank; and Private Wealth Management.

PurePoint Financial serves consumers through a national deposit platform offering savings accounts and CD products to customers through an online platform with services provided through a call center and a network of financial centers in New York, Florida, Illinois and Texas.

U.S. Wholesale & Investment Banking

U.S. Wholesale & Investment Banking delivers the full suite of MUAH products and services to large and mid-corporate customers. 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 and Nonprofit, Public Finance, and Financial Institutions (predominantly Insurance and Asset Managers). U.S. Wholesale & Investment Banking provides customers general corporate credit and structured credit services, including project finance, leasing and equipment finance, commercial finance, funds finance and securitizations. By working with the Company's other segments, U.S. Wholesale & Investment Banking offers its customers a range of noncredit services, which include global treasury management, capital market solutions, and various foreign exchange, 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. The client base consists of financial institutions, corporations, government agencies, insurance companies, mutual funds, investment managers and non-profit organizations.

MUFG Securities Americas

MUSA is MUAH's broker-dealer subsidiary which engages in capital markets origination transactions, private placements, collateralized financings, securities borrowing and lending transactions, and domestic and foreign debt and equity securities transactions.

Other

"Other" includes the MUFG Fund Services segment, Markets segment, Japanese Corporate Banking segment and Corporate Treasury. MUFG Fund Services provides comprehensive investment fund administrative solutions. Markets provides risk management solutions, including foreign exchange, interest rate and energy risk management solutions. The Japanese 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. 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 Part I, Item 3. “Quantitative and Qualitative Disclosures About Market Risk” in this Form 10-Q.

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; fees from affiliates and noninterest expenses associated with MUFG Bank, Ltd. U.S. branch banking operations; 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 FDIC covered assets.

As of and for the Three Months Ended September 30, 2018:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	553	$	104		$	66		$	52	$	57		$	832
Noninterest income	111		103			15			94		303			626
Total revenue	664		207			81			146		360			1,458
Noninterest expense	518		106			65			121		249			1,059
(Reversal of) provision for credit losses	45		27			(3		)	—		(5		)	64
Income (loss) before income taxes and including noncontrolling interests	101		74			19			25		116			335
Income tax expense (benefit) (1)	17		(3		)	5			6		10			35
Net income (loss) including noncontrolling interests	84		77			14			19		106			300
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		6			6
Net income (loss) attributable to MUAH	$	84	$	77		$	14		$	19	$	112		$	306
Total assets, end of period	$	71,501	$	19,467		$	882		$	33,366	$	35,820		$	161,036

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

As of and for the Three Months Ended September 30, 2017:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other		MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	516	$	107		$	64		$	62	$	67	$	816
Noninterest income	108		91			19			100		197		515
Total revenue	624		198			83			162		264		1,331
Noninterest expense	487		98			56			119		222		982
(Reversal of) provision for credit losses	19		(9		)	(1		)	—		9		18
Income (loss) before income taxes and including noncontrolling interests	118		109			28			43		33		331
Income tax expense (benefit) (1)	31		19			11			18		30		109
Net income (loss) including noncontrolling interests	87		90			17			25		3		222
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		10		10
Net income (loss) attributable to MUAH	$	87	$	90		$	17		$	25	$	13	$	232
Total assets, end of period	$	66,025	$	20,813		$	1,042		$	32,538	$	34,434	$	154,852

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

As of and for the Nine Months Ended September 30, 2018:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking		Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	1,620	$	307	$	197		$	157	$	201		$	2,482
Noninterest income	338		283		44			259		680			1,604
Total revenue	1,958		590		241			416		881			4,086
Noninterest expense	1,552		310		186			353		825			3,226
(Reversal of) provision for loan losses	52		3		(4		)	—		(8		)	43
Income (loss) before income taxes and including noncontrolling interests	354		277		59			63		64			817
Income tax expense (benefit) (1)	68		133		16			15		(211		)	21
Net income (loss) including noncontrolling interests	286		144		43			48		275			796
Deduct: net (income) loss from noncontrolling interests	—		—		—			—		20			20
Net income (loss) attributable to MUAH	$	286	$	144	$	43		$	48	$	295		$	816
Total assets, end of period	$	71,501	$	19,467	$	882		$	33,366	$	35,820		$	161,036

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

As of and for the Nine Months Ended September 30, 2017:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	1,527	$	333		$	179		$	178	$	188		$	2,405
Noninterest income	326		296			48			272		550			1,492
Total revenue	1,853		629			227			450		738			3,897
Noninterest expense	1,483		298			171			336		657			2,945
(Reversal of) provision for loan losses	39		(51		)	(1		)	—		(21		)	(34		)
Income (loss) before income taxes and including noncontrolling interests	331		382			57			114		102			986
Income tax expense (benefit) (1)	87		89			23			45		11			255
Net income (loss) including noncontrolling interests	244		293			34			69		91			731
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		25			25
Net income (loss) attributable to MUAH	$	244	$	293		$	34		$	69	$	116		$	756
Total assets, end of period	$	66,025	$	20,813		$	1,042		$	32,538	$	34,434		$	154,852

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

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Summary of Significant Accounting Policies and Nature of Operations (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation

The unaudited Consolidated Financial Statements of MUFG Americas Holdings Corporation, its subsidiaries, and its consolidated variable interest entities (the Company) have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial reporting and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Rules and Regulations of the SEC. However, they do not include all of the disclosures necessary for annual financial statements. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation have been included.

Use of Estimates

The preparation of financial statements in conformity with 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. Critical estimates made by management in the preparation of the Company’s financial statements include, but are not limited to, the allowance for credit losses (Note 3 "Loans and Allowance for Loan Losses"), goodwill impairment, fair value of financial instruments (Note 8 "Fair Value Measurement and Fair Value of Financial Instruments"), pension accounting (Note 11 "Employee Pension and Other Postretirement Benefits"), income taxes, and transfer pricing.

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

Accounting for Leases

In February 2016, the FASB issued ASU 2016-02, Leases, which will require entities that lease assets (i.e., lessees) to recognize assets and liabilities on their balance sheet for the rights and obligations created by those leases. The accounting by entities that own the assets leased (i.e., lessors) will remain largely unchanged; however, leveraged lease accounting will no longer be permitted for leases that commence after the effective date. The ASU will also require qualitative and quantitative disclosures about the amount, timing and uncertainty of cash flows arising from leases. The ASU is effective for interim and annual periods beginning on January 1, 2019 and requires a modified retrospective approach, with early adoption permitted. In July 2018, the FASB issued ASU 2018-11, Leases, which allows entities the option to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company plans to adopt the ASU on January 1, 2019. The Company is in the technology testing phase of this project to support the ongoing lessee accounting required under the ASU. Management is currently assessing the impact of this guidance on the Company's financial position and results of operations.

Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments, which provides new guidance on the accounting for credit losses for instruments that are within its scope. This new guidance is commonly referred to as the current expected credit loss (“CECL”) model. For loans and debt securities accounted for at amortized cost, certain off-balance sheet credit exposures, net investments in leases, and trade receivables, the ASU requires an entity to recognize its estimate of credit losses expected over the life of the financial instrument or exposure. Lifetime expected credit losses on purchased financial assets with credit deterioration will be recognized as an allowance with an offset to the cost basis of the asset. For available for sale debt securities, the new standard will require recognition of expected credit losses by recognizing an allowance for credit losses when the fair value of the security is below amortized cost and the recognition of this allowance is limited to the difference between the security’s amortized cost basis and fair value. The ASU is effective for interim and annual periods beginning on January 1, 2020, with early adoption permitted in 2019. The Company plans to adopt the ASU on January 1, 2020. The Company is in the design phase of the implementation. Management is currently assessing the impact of this guidance on the Company’s financial position and results of operations.

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment. The ASU removes Step 2 of the goodwill impairment test, which measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. Under the amendments, a goodwill impairment loss will be measured as the amount by which a reporting unit’s carrying amount exceeds its fair value; however, the loss recognized cannot exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss. The ASU will be effective for MUAH beginning January 1, 2020 on a prospective basis. Early adoption is permitted for any impairment tests performed after January 1, 2017. Management does not expect the adoption of this guidance to significantly impact the Company’s financial position or results of operations.

Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities, which requires premiums on certain purchased callable debt securities to be amortized to the earliest call date. Under current guidance, premiums on callable debt securities are generally amortized over the contractual life of the security. The amortization period for callable debt securities purchased at a discount will not be impacted. The ASU is effective for interim and annual periods beginning on January 1, 2019 and requires a modified retrospective approach, 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.

Targeted Improvements to Accounting for Hedging Activities

In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities, which will make more hedging strategies eligible for hedge accounting, simplify the application of hedge accounting, and enhance the transparency and understandability of hedge results. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. It also amends the disclosure requirements and changes how entities assess effectiveness. The guidance will be effective for MUAH beginning January 1, 2019, with early adoption permitted. If the guidance is early adopted in an interim period, any adjustments would be reflected as of the beginning of the fiscal year that includes that interim period. Management is currently assessing the impact of this guidance on the Company’s financial position and results of operations.

Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement

In August 2018, the FASB issued ASU 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement, which modifies disclosure requirements on fair value measurements to improve their effectiveness. The guidance permits entities to consider materiality when evaluating fair value measurement disclosures and, among other modifications, requires certain new disclosures related to Level 3 fair value measurements. The guidance will be effective for MUAH beginning January 1, 2020, with early adoption permitted. The guidance only affects disclosures in the notes to the consolidated financial statements and will not affect the Company’s financial position or results of operations.

Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued ASU 2018-14, Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans, which modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans to improve the effectiveness of the disclosures. The guidance includes new requirements to disclose the weighted-average interest crediting rate for cash balance plans and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation. The guidance is effective for years ending after December 15, 2020, with early adoption permitted. This guidance only affects disclosures in the notes to the consolidated financial statements and will not affect the Company’s financial position or results of operations.

Recently Adopted Accounting Pronouncements

Revenue from Contracts with Customers

Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers, which provides guidance on the core principle that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU applies to all contracts with customers, except financial instruments, guarantees, lease contracts, insurance contracts and certain non-monetary exchanges. This guidance did not significantly affect the Company's financial position and results of operations. As a result of adopting this guidance, the Company's accounting policies have been updated as summarized below.

Revenues from Contracts with Customers

Revenues from contracts with customers include service charges on deposit accounts, trust and investment management fees, brokerage commissions and fees, card processing fees, net, investment banking and syndication fees, and fees from affiliates. The Company recognizes revenue from contracts with customers according to a five-step revenue recognition model: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the entity satisfies a performance obligation. The Company’s contracts with customers generally contain a single performance obligation or separately identified performance obligations, each with a stated transaction price and generally do not involve a significant timing difference between satisfaction of the performance obligation and customer payment. Revenues are recognized over time or at a point in time as the performance obligations are satisfied. Certain revenues, primarily included within brokerage commissions and fees, are variable. However, recognition of these variable revenues does not involve significant estimates or constraints.

Principal versus Agent Considerations (Reporting Revenue Gross versus Net)

Effective January 1, 2018, the Company adopted ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net). The ASU amends ASU 2014-09, Revenue from Contracts with Customers, with respect to assessing whether an entity is a principal (and thus presents revenue gross) or an agent (and thus presents revenue net). The amendments retain the guidance that the principal in an arrangement controls a good or service before it is transferred to a customer and clarify: (1) that an entity must first identify the specified good or service being provided to the customer; (2) that the unit of account for the principal versus agent assessment is each specified good or service promised in a contract; (3) indicators and examples to help an entity evaluate whether it is the principal; and (4) how to assess whether an entity controls services performed by another party. As a result of adopting ASU 2016-08, beginning January 1, 2018, certain expenses that were previously presented as a reduction of related fees from affiliates and investment banking and syndication fees are presented in noninterest expense.

Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost

Effective January 1, 2018, the Company adopted ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which amended the income statement presentation of the components of net periodic benefit cost for sponsored defined benefit pension and other postretirement plans. As a result of adopting ASU 2017-07, the salaries and employee benefits expense and other expense categories in noninterest expense have been adjusted to reflect adoption of this guidance as follows.

	For the Three Months Ended							For the Nine Months Ended
	September 30, 2017							September 30, 2017
(Dollars in millions)	As Previously Reported		Adjustment			As Reported under New Guidance		As Previously Reported		Adjustment			As Reported under New Guidance
Salaries and employee benefits	$	589	$	32		$	621	$	1,790	$	91		$	1,881
Other	126		(32		)	94		358		(91		)	267

Revenue from Contracts with Customers

Revenues from Contracts with Customers

Revenues from contracts with customers include service charges on deposit accounts, trust and investment management fees, brokerage commissions and fees, card processing fees, net, investment banking and syndication fees, and fees from affiliates. The Company recognizes revenue from contracts with customers according to a five-step revenue recognition model: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the entity satisfies a performance obligation. The Company’s contracts with customers generally contain a single performance obligation or separately identified performance obligations, each with a stated transaction price and generally do not involve a significant timing difference between satisfaction of the performance obligation and customer payment. Revenues are recognized over time or at a point in time as the performance obligations are satisfied. Certain revenues, primarily included within brokerage commissions and fees, are variable. However, recognition of these variable revenues does not involve significant estimates or constraints.

Principal versus Agent Considerations (Reporting Revenue Gross versus Net)

Effective January 1, 2018, the Company adopted ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net). The ASU amends ASU 2014-09, Revenue from Contracts with Customers, with respect to assessing whether an entity is a principal (and thus presents revenue gross) or an agent (and thus presents revenue net). The amendments retain the guidance that the principal in an arrangement controls a good or service before it is transferred to a customer and clarify: (1) that an entity must first identify the specified good or service being provided to the customer; (2) that the unit of account for the principal versus agent assessment is each specified good or service promised in a contract; (3) indicators and examples to help an entity evaluate whether it is the principal; and (4) how to assess whether an entity controls services performed by another party. As a result of adopting ASU 2016-08, beginning January 1, 2018, certain expenses that were previously presented as a reduction of related fees from affiliates and investment banking and syndication fees are presented in noninterest expense.

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Summary of Significant Accounting Policies and Nature of Operations (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of Impact as a Result of Adopting ASU 2017-07

As a result of adopting ASU 2017-07, the salaries and employee benefits expense and other expense categories in noninterest expense have been adjusted to reflect adoption of this guidance as follows.

	For the Three Months Ended							For the Nine Months Ended
	September 30, 2017							September 30, 2017
(Dollars in millions)	As Previously Reported		Adjustment			As Reported under New Guidance		As Previously Reported		Adjustment			As Reported under New Guidance
Salaries and employee benefits	$	589	$	32		$	621	$	1,790	$	91		$	1,881
Other	126		(32		)	94		358		(91		)	267

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Securities (Tables)

9 Months Ended

Sep. 30, 2018

Securities

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

At September 30, 2018 and December 31, 2017, the amortized cost, gross unrealized gains, gross unrealized losses and fair values of securities available for sale are presented below.

	September 30, 2018
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset Liability Management securities:
U.S. Treasury	$	3,964	$	—	$	234	$	3,730
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	8,739		2		240		8,501
Privately issued	891		—		30		861
Privately issued - commercial mortgage-backed securities	1,109		—		31		1,078
Collateralized loan obligations	1,434		1		1		1,434
Other	4		—		—		4
Asset Liability Management securities	16,141		3		536		15,608
Other debt securities:
Direct bank purchase bonds	1,292		28		39		1,281
Other	188		1		1		188
Total securities available for sale	$	17,621	$	32	$	576	$	17,077

	December 31, 2017
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset Liability Management securities:
U.S. Treasury	$	3,370	$	—	$	118	$	3,252
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	9,338		2		132		9,208
Privately issued	695		3		4		694
Privately issued - commercial mortgage-backed securities	823		4		5		822
Collateralized loan obligations	1,895		10		—		1,905
Other	5		—		—		5
Asset Liability Management securities	16,126		19		259		15,886
Other debt securities:
Direct bank purchase bonds	1,495		38		30		1,503
Other	163		1		—		164
Equity securities	10		—		—		10
Total securities available for sale	$	17,794	$	58	$	289	$	17,563

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

The gross realized gains and losses from sales of available for sale securities for the three and nine months endedSeptember 30, 2018 and 2017 are shown below. The specific identification method is used to calculate realized gains and losses on sales.

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Dollars in millions)	2018		2017		2018		2017
Gross realized gains	$	1	$	6	$	4	$	15

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

At September 30, 2018 and December 31, 2017, the amortized cost, gross unrealized gains and losses recognized in OCI, carrying amount, gross unrealized gains and losses not recognized in OCI, and fair values of securities held to maturity are presented below. Management has asserted the positive intent and ability to hold these securities to maturity.

	September 30, 2018
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury	$	527	$	—	$	—	$	527	$	2	$	3	$	526
U.S. government-sponsored agencies	772		—		—		772		—		1		771
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	8,651		2		101		8,552		3		337		8,218
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	1,514		—		45		1,469		8		20		1,457
Total securities held to maturity	$	11,464	$	2	$	146	$	11,320	$	13	$	361	$	10,972

	December 31, 2017
			Recognized in OCI						Not Recognized in OCI
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury	$	525	$	—	$	—	$	525	$	3	$	1	$	527
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	7,870		2		31		7,841		15		130		7,726
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	1,571		—		52		1,519		36		9		1,546
Total securities held to maturity	$	9,966	$	2	$	83	$	9,885	$	54	$	140	$	9,799

Securities Available for Sale

Securities

Securities in Unrealized Loss Position

The Company’s securities available for sale with a continuous unrealized loss position at September 30, 2018 and December 31, 2017 are shown below, identified for periods less than 12 months and 12 months or more.

	September 30, 2018
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Asset Liability Management securities:
U.S. Treasury	$	869	$	20	$	2,813	$	214	$	3,682	$	234
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	3,996		71		3,572		169		7,568		240
Privately issued	642		19		193		11		835		30
Privately issued - commercial mortgage-backed securities	679		17		299		14		978		31
Collateralized loan obligations	606		1		—		—		606		1
Asset Liability Management securities	6,792		128		6,877		408		13,669		536
Other debt securities:
Direct bank purchase bonds	307		10		393		29		700		39
Other	109		1		—		—		109		1
Total securities available for sale	$	7,208	$	139	$	7,270	$	437	$	14,478	$	576

	December 31, 2017
	Less than 12 months				12 months or more				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Asset Liability Management securities:
U.S. Treasury	$	1,074	$	14	$	2,128	$	104	$	3,202	$	118
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	3,606		22		4,651		110		8,257		132
Privately issued	275		1		164		3		439		4
Privately issued - commercial mortgage-backed securities	447		3		80		2		527		5
Collateralized loan obligations	12		—		—		—		12		—
Asset Liability Management securities	5,414		40		7,023		219		12,437		259
Other debt securities:
Direct bank purchase bonds	58		4		563		26		621		30
Other	79		—		—		—		79		—
Equity securities	10		—		—		—		10		—
Total securities available for sale	$	5,561	$	44	$	7,586	$	245	$	13,147	$	289

Debt Securities by Contractual Maturity

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

	September 30, 2018
(Dollars in millions)	One Year or Less		Over One Year Through Five Years		Over Five Years Through Ten Years		Over Ten Years		Total Fair Value
Asset Liability Management securities:
U.S. Treasury	$	—	$	1,163	$	2,567	$	—	$	3,730
Residential mortgage-backed securities:
U.S. government agency and government-sponsored agencies	—		266		1,354		6,881		8,501
Privately issued	—		—		—		861		861
Privately issued - commercial mortgage-backed securities	—		—		42		1,036		1,078
Collateralized loan obligations	—		2		389		1,043		1,434
Other	1		3		—		—		4
Asset Liability Management securities	1		1,434		4,352		9,821		15,608
Other debt securities:
Direct bank purchase bonds	112		301		741		127		1,281
Other	—		169		—		19		188
Total debt securities available for sale	$	113	$	1,904	$	5,093	$	9,967	$	17,077

Securities Held to Maturity

Securities

Securities in Unrealized Loss Position

The Company’s securities held to maturity with a continuous unrealized loss position at September 30, 2018 and December 31, 2017 are shown below, separately for periods less than 12 months and 12 months or more.

	September 30, 2018
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
U.S. Treasury	$	494	$	—	$	3	$	—	$	—	$	—	$	494	$	—	$	3
U.S. government-sponsored agencies	720		—		1		—		—		—		720		—		1
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	2,753		28		73		5,300		73		264		8,053		101		337
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	46		—		1		1,411		45		19		1,457		45		20
Total securities held to maturity	$	4,013	$	28	$	78	$	6,711	$	118	$	283	$	10,724	$	146	$	361

	December 31, 2017
	Less than 12 months						12 months or more						Total
			Unrealized Losses						Unrealized Losses						Unrealized Losses
(Dollars in millions)	Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI		Fair Value		Recognized in OCI		Not Recognized in OCI
U.S. Treasury	$	494	$	—	$	1	$	—	$	—	$	—	$	494	$	—	$	1
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	2,649		—		31		4,000		31		99		6,649		31		130
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	19		—		—		1,496		52		9		1,515		52		9
Total securities held to maturity	$	3,162	$	—	$	32	$	5,496	$	83	$	108	$	8,658	$	83	$	140

Debt Securities by Contractual Maturity

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

					September 30, 2018
	Within One Year				Over One Year Through Five Years				Over Five Years Through Ten Years				Over Ten Years				Total
(Dollars in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
U.S. Treasury	$	518	$	516	$	9	$	10	$	—	$	—	$	—	$	—	$	527	$	526
U.S. government-sponsored agencies	—		—		—		—		772		771		—		—		772		771
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities	—		—		—		—		1,058		1,022		7,494		7,196		8,552		8,218
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities	48		49		794		796		—		—		627		612		1,469		1,457
Total securities held to maturity	$	566	$	565	$	803	$	806	$	1,830	$	1,793	$	8,121	$	7,808	$	11,320	$	10,972

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Loans and Allowance for Loan Losses (Tables)

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Summary of Loans

The following table provides the outstanding balances of loans held for investment at September 30, 2018 and December 31, 2017.

(Dollars in millions)	September 30, 2018			December 31, 2017
Loans held for investment:
Commercial and industrial	$	23,349		$	23,281
Commercial mortgage	15,031			14,320
Construction	1,480			1,775
Lease financing	1,417			1,533
Total commercial portfolio	41,277			40,909
Residential mortgage	38,059			35,643
Home equity and other consumer loans	4,317			3,462
Total consumer portfolio	42,376			39,105
Total loans held for investment(1)	83,653			80,014
Allowance for loan losses	(501		)	(476		)
Loans held for investment, net	$	83,152		$	79,538

(1) Includes $338 million and $301 million at September 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.

Reconciliation of Changes in Allowance for Loan Losses by Portfolio Segment

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

	For the Three Months Ended September 30, 2018
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	362		$	78		$	5	$	445
(Reversal of) provision for loan losses	33			24			5		62
Loans charged-off	(8		)	(8		)	—		(16		)
Recoveries of loans previously charged-off	8			2			—		10
Allowance for loan losses, end of period	$	395		$	96		$	10	$	501

	For the Three Months Ended September 30, 2017
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	435		$	78		$	—	$	513
(Reversal of) provision for loan losses	(7		)	10			30		33
Other	2			—			—		2
Loans charged-off	(7		)	(10		)	—		(17		)
Recoveries of loans previously charged-off	8			3			—		11
Allowance for loan losses, end of period	$	431		$	81		$	30	$	542

	For the Nine Months Ended September 30, 2018
(Dollars in millions)	Commercial			Consumer			Unallocated			Total
Allowance for loan losses, beginning of period	$	360		$	86		$	30		$	476
(Reversal of) provision for loan losses	32			32			(20		)	44
Loans charged-off	(15		)	(27		)	—			(42		)
Recoveries of loans previously charged-off	18			5			—			23
Allowance for loan losses, end of period	$	395		$	96		$	10		$	501

	For the Nine Months Ended September 30, 2017
(Dollars in millions)	Commercial			Consumer			Unallocated		Total
Allowance for loan losses, beginning of period	$	556		$	83		$	—	$	639
(Reversal of) provision for loan losses	(57		)	26			30		(1		)
Other	2			—			—		2
Loans charged-off	(91		)	(32		)	—		(123		)
Recoveries of loans previously charged-off	21			4			—		25
Allowance for loan losses, end of period	$	431		$	81		$	30	$	542

Allowance for Loan Losses and Related Loan Balances by Portfolio Segment

The following tables show the allowance for loan losses and related loan balances by portfolio segment as of September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Commercial		Consumer		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	116	$	13	$	—	$	129
Collectively evaluated for impairment	279		83		10		372
Total allowance for loan losses	$	395	$	96	$	10	$	501
Loans held for investment:
Individually evaluated for impairment	$	497	$	289	$	—	$	786
Collectively evaluated for impairment	40,780		42,087		—		82,867
Total loans held for investment	$	41,277	$	42,376	$	—	$	83,653

	December 31, 2017
(Dollars in millions)	Commercial		Consumer		Unallocated		Total
Allowance for loan losses:
Individually evaluated for impairment	$	58	$	15	$	—	$	73
Collectively evaluated for impairment	302		71		30		403
Total allowance for loan losses	$	360	$	86	$	30	$	476
Loans held for investment:
Individually evaluated for impairment	$	544	$	321	$	—	$	865
Collectively evaluated for impairment	40,365		38,784		—		79,149
Total loans held for investment	$	40,909	$	39,105	$	—	$	80,014

Summary of Nonaccrual Loans

The following table presents nonaccrual loans as of September 30, 2018 and December 31, 2017.

(Dollars in millions)	September 30, 2018		December 31, 2017
Commercial and industrial	$	268	$	319
Commercial mortgage	12		20
Total commercial portfolio	280		339
Residential mortgage	111		104
Home equity and other consumer loans	20		22
Total consumer portfolio	131		126
Total nonaccrual loans	$	411	$	465
Troubled debt restructured loans that continue to accrue interest	$	354	$	348
Troubled debt restructured nonaccrual loans (included in total nonaccrual loans above)	$	252	$	229

Aging of Balance of Loans Held for Investment

The following tables show the aging of the balance of loans held for investment by class as of September 30, 2018 and December 31, 2017.

	September 30, 2018
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	24,634	$	31	$	101	$	132	$	24,766
Commercial mortgage	14,989		38		4		42		15,031
Construction	1,480		—		—		—		1,480
Total commercial portfolio	41,103		69		105		174		41,277
Residential mortgage	37,855		166		38		204		38,059
Home equity and other consumer loans	4,284		22		11		33		4,317
Total consumer portfolio	42,139		188		49		237		42,376
Total loans held for investment	$	83,242	$	257	$	154	$	411	$	83,653

	December 31, 2017
	Aging Analysis of Loans
(Dollars in millions)	Current		30 to 89 Days Past Due		90 Days or More Past Due		Total Past Due		Total
Commercial and industrial	$	24,734	$	17	$	63	$	80	$	24,814
Commercial mortgage	14,298		16		6		22		14,320
Construction	1,775		—		—		—		1,775
Total commercial portfolio	40,807		33		69		102		40,909
Residential mortgage	35,453		151		39		190		35,643
Home equity and other consumer loans	3,427		23		12		35		3,462
Total consumer portfolio	38,880		174		51		225		39,105
Total loans held for investment	$	79,687	$	207	$	120	$	327	$	80,014

Loans in Commercial Portfolio Segment Monitored for Credit Quality Based on Regulatory Risk Ratings

The following tables summarize the loans in the commercial portfolio segment monitored for credit quality based on regulatory risk ratings.

	September 30, 2018
			Criticized
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	23,602	$	404	$	760	$	24,766
Commercial mortgage	14,769		100		162		15,031
Construction	1,398		4		78		1,480
Total commercial portfolio	$	39,769	$	508	$	1,000	$	41,277

	December 31, 2017
			Criticized
(Dollars in millions)	Pass		Special Mention		Classified		Total
Commercial and industrial	$	23,632	$	435	$	747	$	24,814
Commercial mortgage	14,081		80		159		14,320
Construction	1,632		15		128		1,775
Total commercial portfolio	$	39,345	$	530	$	1,034	$	40,909

Loans in Consumer Portfolio an Purchased credit-impaired loans

The following tables summarize the loans in the consumer portfolio segment, which exclude $6 million and $8 million of loans covered by FDIC loss share agreements, at September 30, 2018 and December 31, 2017, respectively.

	September 30, 2018
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	37,944	$	111	$	38,055
Home equity and other consumer loans	4,295		20		4,315
Total consumer portfolio	$	42,239	$	131	$	42,370

	December 31, 2017
(Dollars in millions)	Accrual		Nonaccrual		Total
Residential mortgage	$	35,534	$	104	$	35,638
Home equity and other consumer loans	3,437		22		3,459
Total consumer portfolio	$	38,971	$	126	$	39,097

Loans in Consumer Portfolio Segment Based on Refreshed FICO Scores and Refreshed LTV ratios

These tables exclude loans covered by FDIC loss share agreements, as discussed above. The amounts presented reflect unpaid principal balances less partial charge-offs.

	September 30, 2018
	FICO scores
(Dollars in millions)	720 and Above			Below 720			No FICO Available(1)			Total
Residential mortgage	$	31,284		$	5,939		$	445		$	37,668
Home equity and other consumer loans	3,001			1,200			55			4,256
Total consumer portfolio	$	34,285		$	7,139		$	500		$	41,924
Percentage of total	82		%	17		%	1		%	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, 2017
	FICO scores
(Dollars in millions)	720 and Above			Below 720			No FICO Available(1)			Total
Residential mortgage	$	28,786		$	6,082		$	411		$	35,279
Home equity and other consumer loans	2,404			918			84			3,406
Total consumer portfolio	$	31,190		$	7,000		$	495		$	38,685
Percentage of total	81		%	18		%	1		%	100		%

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

	September 30, 2018
	LTV ratios
(Dollars in millions)	Less than or Equal to 80 Percent			Greater than 80 and Less than 100 Percent			Greater than or Equal to 100 Percent			No LTV Available(1)			Total
Residential mortgage	$	36,985		$	654		$	4		$	25		$	37,668
Home equity loans	1,979			215			12			28			2,234
Total consumer portfolio	$	38,964		$	869		$	16		$	53		$	39,902
Percentage of total	98		%	2		%	—		%	—		%	100		%

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

	December 31, 2017
	LTV ratios
(Dollars in millions)	Less than or Equal to 80 Percent			Greater than 80 and Less than 100 Percent			Greater than or Equal to 100 Percent			No LTV Available(1)			Total
Residential mortgage	$	34,472		$	771		$	4		$	32		$	35,279
Home equity loans	2,052			248			24			33			2,357
Total consumer portfolio	$	36,524		$	1,019		$	28		$	65		$	37,636
Percentage of total	97		%	3		%	—		%	—		%	100		%

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

Summary of Troubled Debt Restructurings

The following table provides a summary of the Company’s recorded investment in TDRs as of September 30, 2018 and December 31, 2017. The summary includes those TDRs that are on nonaccrual status and those that continue to accrue interest. The Company had $39 million and $66 million in commitments to lend additional funds to borrowers with loan modifications classified as TDRs as of September 30, 2018 and December 31, 2017, respectively.

(Dollars in millions)	September 30, 2018		December 31, 2017
Commercial and industrial	$	253	$	202
Commercial mortgage	53		7
Construction	78		128
Total commercial portfolio	384		337
Residential mortgage	200		215
Home equity and other consumer loans	22		25
Total consumer portfolio	222		240
Total restructured loans	$	606	$	577

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

The following tables provide the pre- and post-modification outstanding recorded investment amounts of TDRs as of the date of the restructuring that occurred during the three and nine months ended September 30, 2018 and 2017.

	For the Three Months Ended September 30, 2018				For the Nine Months Ended September 30, 2018
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)		Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	59	$	59	$	163	$	163
Total commercial portfolio	59		59		163		163
Residential mortgage	4		4		6		6
Home equity and other consumer loans	1		1		2		2
Total consumer portfolio	5		5		8		8
Total	$	64	$	64	$	171	$	171

(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.

	For the Three Months Ended September 30, 2017				For the Nine Months Ended September 30, 2017
(Dollars in millions)	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)		Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(2)
Commercial and industrial	$	20	$	20	$	116	$	116
Commercial mortgage	2		2		3		3
Construction	—		—		61		61
Total commercial portfolio	22		22		180		180
Residential mortgage	6		6		14		14
Home equity and other consumer loans	—		—		2		2
Total consumer portfolio	6		6		16		16
Total	$	28	$	28	$	196	$	196

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

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

Recorded Investment Amounts of Troubled Debt Restructurings

The following tables provide the recorded investment amounts of TDRs at the date of default, for which there was a payment default during the three and nine months ended September 30, 2018 and 2017, and where the default occurred within the first twelve months after modification into a TDR. A payment default is defined as the loan being 60 days or more past due.

(Dollars in millions)	For the Three Months Ended September 30, 2018		For the Nine Months Ended September 30, 2018
Residential mortgage	$	—	$	2
Total consumer portfolio	—		2
Total	$	—	$	2

(Dollars in millions)	For the Three Months Ended September 30, 2017		For the Nine Months Ended September 30, 2017
Commercial and industrial	$	—	$	19
Commercial mortgage	—		1
Total commercial portfolio	—		20
Residential mortgage	1		2
Total consumer portfolio	1		2
Total	$	1	$	22

Information about Impaired Loans by Class

The following tables show information about impaired loans by class as of September 30, 2018 and December 31, 2017.

	September 30, 2018
	Recorded Investment								Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total		Allowance for Impaired Loans		With an Allowance		Without an Allowance
Commercial and industrial	$	321	$	22	$	343	$	112	$	372	$	91
Commercial mortgage	24		53		77		—		24		53
Construction	70		7		77		4		70		7
Total commercial portfolio	415		82		497		116		466		151
Residential mortgage	180		73		253		13		190		87
Home equity and other consumer loans	23		13		36		—		23		22
Total consumer portfolio	203		86		289		13		213		109
Total	$	618	$	168	$	786	$	129	$	679	$	260

	December 31, 2017
	Recorded Investment								Unpaid Principal Balance
(Dollars in millions)	With an Allowance		Without an Allowance		Total		Allowance for Impaired Loans		With an Allowance		Without an Allowance
Commercial and industrial	$	287	$	93	$	380	$	57	$	348	$	102
Commercial mortgage	33		3		36		1		33		3
Construction	—		128		128		—		—		128
Total commercial portfolio	320		224		544		58		381		233
Residential mortgage	218		59		277		15		234		69
Home equity and other consumer loans	29		15		44		—		30		24
Total consumer portfolio	247		74		321		15		264		93
Total	$	567	$	298	$	865	$	73	$	645	$	326

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

The following table presents the average recorded investment in impaired loans and the amount of interest income recognized for impaired loans during the three and nine months ended September 30, 2018 and 2017 for the commercial and consumer loans portfolio segments.

	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2018				2017				2018				2017
(Dollars in millions)	Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income		Average Recorded Investment		Recognized Interest Income
Commercial and industrial	$	329	$	3	$	397	$	4	$	306	$	8	$	466	$	15
Commercial mortgage	79		5		96		11		56		23		94		33
Construction	78		3		9		2		106		7		12		3
Total commercial portfolio	486		11		502		17		468		38		572		51
Residential mortgage	257		3		305		3		264		10		310		10
Home equity and other consumer loans	36		—		53		1		39		2		55		5
Total consumer portfolio	293		3		358		4		303		12		365		15
Total	$	779	$	14	$	860	$	21	$	771	$	50	$	937	$	66

The following table presents loan transfers from held to investment to held for sale and proceeds from

sales of loans during the three and nine months ended September 30, 2018 and 2017 for the commercial and consumer loans portfolio segments.

	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2018				2017				2018				2017
(Dollars in millions)	Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale		Proceeds from Sale		Net Transfer of Loans Held for Investment to (from) Loans Held for Sale			Proceeds from Sale
Commercial portfolio	$	77	$	49	$	477	$	105	$	10	$	563	$	837		$	751
Consumer portfolio	—		—		—		—		—		—		(4		)	—
Total	$	77	$	49	$	477	$	105	$	10	$	563	$	833		$	751

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Variable Interest Entities (Tables)

9 Months Ended

Sep. 30, 2018

Variable Interest Entities

Schedule of assets and liabilities of VIEs

The following table presents the impact of the unconsolidated LIHC investments on our consolidated statements of income for the three and nine months endedSeptember 30, 2018 and 2017.

	For the Three Months Ended				For the Nine Months Ended
	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
(Dollars in millions)
Losses from LIHC investments included in other noninterest expense	$	2	$	4	$	6	$	8
Amortization of LIHC investments included in income tax expense	34		37		102		106
Tax credits and other tax benefits from LIHC investments included in income tax expense	39		49		130		141

Consolidated VIEs

Variable Interest Entities

Schedule of assets and liabilities of VIEs

The following tables present the assets and liabilities of consolidated VIEs recorded on the Company’s consolidated balance sheets at September 30, 2018 and December 31, 2017.

	September 30, 2018
	Consolidated Assets								Consolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities
LIHC investments	$	—	$	—	$	48	$	48	$	—	$	—
Leasing investments	—		569		140		709		14		14
Total consolidated VIEs	$	—	$	569	$	188	$	757	$	14	$	14

	December 31, 2017
	Consolidated Assets								Consolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities
LIHC investments	$	—	$	—	$	68	$	68	$	—	$	—
Leasing investments	1		583		158		742		24		24
Total consolidated VIEs	$	1	$	583	$	226	$	810	$	24	$	24

Unconsolidated VIEs

Variable Interest Entities

Schedule of assets and liabilities of VIEs

The following tables present the Company’s carrying amounts related to the unconsolidated VIEs at September 30, 2018 and December 31, 2017. The tables also present 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. During the nine months endedSeptember 30, 2018 and September 30, 2017, the Company had noncash increases in unfunded commitments on LIHC investments of $45 million and $22 million, respectively, included within other liabilities.

	September 30, 2018
	Unconsolidated Assets										Unconsolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Securities Available for Sale		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	—	$	28	$	236	$	971	$	1,235	$	176	$	176	$	1,235
Leasing investments	30		—		21		1,453		1,504		44		44		1,525
Other investments	—		—		5		34		39		—		—		80
Total unconsolidated VIEs	$	30	$	28	$	262	$	2,458	$	2,778	$	220	$	220	$	2,840

	December 31, 2017
	Unconsolidated Assets										Unconsolidated Liabilities
(Dollars in millions)	Interest Bearing Deposits in Banks		Securities Available for Sale		Loans Held for Investment, Net		Other Assets		Total Assets		Other Liabilities		Total Liabilities		Maximum Exposure to Loss
LIHC investments	$	—	$	29	$	228	$	1,028	$	1,285	$	254	$	254	$	1,284
Leasing investments	1		—		24		1,745		1,770		53		53		1,792
Other investments	—		—		24		26		50		—		—		132
Total unconsolidated VIEs	$	1	$	29	$	276	$	2,799	$	3,105	$	307	$	307	$	3,208

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Securities Financing Arrangements (Tables)

9 Months Ended

Sep. 30, 2018

Transfers and Servicing [Abstract]

Schedule of Offsetting Assets

Schedule of Offsetting Liabilities

Secured Borrowings by Contractual Maturity and Class of Collateral Pledged

The following tables present the gross obligations for securities sold under agreements to repurchase and securities loaned by remaining contractual maturity and class of collateral pledged at September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Overnight and Continuous		Up to 30 Days		31 - 90 Days		Greater than 90 Days		Total
Securities sold under agreements to repurchase:
U.S. Treasury securities	$	12,283	$	648	$	313	$	250	$	13,494
U.S. government-sponsored agency securities	119		166		16		—		301
Money market securities	—		—		289		—		289
Asset-backed securities	—		—		242		—		242
Mortgage-backed securities	8,808		2,325		6,709		1,150		18,992
Corporate bonds	1,346		131		813		—		2,290
State and municipal securities	44		66		394		—		504
Equity securities	249		3		274		—		526
Total	$	22,849	$	3,339	$	9,050	$	1,400	$	36,638
Securities loaned:
U.S. Treasury securities	$	—	$	170	$	41	$	—	$	211
Equity securities	285		—		—		—		285
Total	$	285	$	170	$	41	$	—	$	496

	December 31, 2017
(Dollars in millions)	Overnight and Continuous		Up to 30 Days		31 - 90 Days		Greater than 90 Days		Total
Securities sold under agreements to repurchase:
U.S. Treasury securities	$	8,244	$	2,370	$	1,046	$	1,158	$	12,818
U.S. government-sponsored agency securities	115		38		63		—		216
Other sovereign government obligations	—		—		4		—		4
Money market securities	1		—		6		—		7
Asset-backed securities	32		—		164		—		196
Mortgage-backed securities	8,322		4,972		5,859		250		19,403
Corporate bonds	580		620		1,125		—		2,325
State and municipal securities	283		—		276		—		559
Equity securities	416		376		189		—		981
Total	$	17,993	$	8,376	$	8,732	$	1,408	$	36,509
Securities loaned:
Corporate bonds	$	—	$	322	$	—	$	—	$	322
Equity securities	446		10		101		—		557
Total	$	446	$	332	$	101	$	—	$	879

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Commercial Paper and Other Short-Term Borrowings (Tables)

9 Months Ended

Sep. 30, 2018

Short-term Debt [Abstract]

Summary of Commercial Paper and Other Short-Term Borrowings

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

(Dollars in millions)	September 30, 2018		December 31, 2017
Debt issued by MUB
Commercial paper, with a weighted average interest rate of 2.08% and 1.26% at September 30, 2018 and December 31, 2017, respectively	$	293	$	347
Federal Home Loan Bank advances, with a weighted average interest rate of 2.22% and 1.42% at September 30, 2018 and December 31, 2017, respectively	7,000		5,750
Total debt issued by MUB	7,293		6,097
Debt issued by other MUAH subsidiaries
Short-term debt due to MUFG Bank, Ltd., with weighted average interest rates of 2.67% and 1.88% at September 30, 2018 and December 31, 2017, respectively	150		168
Short-term debt due to affiliates, with weighted average interest rates of (-0.07)% and (-0.09)% at September 30, 2018 and December 31, 2017, respectively	866		801
Total debt issued by other MUAH subsidiaries	1,016		969
Total commercial paper and other short-term borrowings	$	8,309	$	7,066

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Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Summary of Long-Term Debt

The following is a summary of the Company's long-term debt.

(Dollars in millions)	September 30, 2018		December 31, 2017
Debt issued by MUAH
Senior debt:
Floating rate senior notes due February 2018. These notes, which bore interest at 0.57% above 3-month LIBOR, had a rate of 1.97% at December 31, 2017	$	—	$	250
Fixed rate 1.625% notes due February 2018	—		450
Fixed rate 2.25% notes due February 2020	999		998
Fixed rate 3.50% notes due June 2022	398		398
Fixed rate 3.00% notes due February 2025	496		496
Senior debt due to MUFG Bank, Ltd:
Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 3.19% at September 30, 2018 and 2.45% at December 31, 2017	545		545
Floating rate debt due September 2020. This note, which bears interest at 0.85% above 3-month LIBOR, had a rate of 3.18% at September 30, 2018 and 2.54% at December 31, 2017	3,500		3,500
Floating rate debt due December 2023. This note, which bears interest at 0.76% above 3-month EURIBOR, had a rate of .76% at September 30, 2018 and 0.76% at December 31, 2017	24		24
Subordinated debt due to MUFG Bank, Ltd:
Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 3.71% at September 30, 2018 and 3.07% at December 31, 2017	300		300
Junior subordinated debt payable to trusts:
Floating rate note due September 2036. This note had an interest rate of 4.03% at September 30, 2018 and 3.29% at December 31, 2017	36		36
Total debt issued by MUAH	6,298		6,997
Debt issued by MUB
Senior debt:
Fixed rate 2.63% notes due September 2018	—		1,000
Fixed rate 2.25% notes due May 2019	497		497
Fixed rate FHLB of San Francisco advances due between October 2018 and June 2020. These notes bear a combined weighted average rate of 2.12% at September 30, 2018 and 1.51% at December 31, 2017	4,900		1,500
Subordinated debt due to MUFG Bank, Ltd:
Floating rate subordinated debt due June 2023. This note, which bore interest at 1.20% above 3-month LIBOR, had a rate of 2.89% at December 31, 2017	—		750
Other	28		63
Total debt issued by MUB	5,425		3,810
Debt issued by other MUAH subsidiaries
Senior debt due to MUFG Bank, Ltd:
Various floating rate borrowings due between December 2020 and May 2021. These notes, which bear interest above 3-month LIBOR had a weighted average interest rate of 2.39% at September 30, 2018 and 1.78% at December 31, 2017	250		291
Various fixed rate borrowings due between February 2019 and May 2024 with a weighted average interest rate of 1.82% (between 0.14% and 2.44%) at September 30, 2018 and 2.12% (between 1.37% and 2.65%) at December 31, 2017	264		339
Subordinated debt due to Affiliate:
Various floating rate borrowings due between September 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had an interest rate of 4.13% at September 30, 2018 and 2.95% (between 2.88% and 3.04%) at December 31, 2017	75		185

Non-recourse debt due to MUFG Bank, Ltd:
Various floating rate non-recourse borrowings due between November 2018 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.83% (between 3.49% and 4.48%) at September 30, 2018 and 3.07% (between 1.49% and 5.58%) at December 31, 2017	77		79
Fixed rate non-recourse borrowings due between January 2019 and July 2023 which had an interest rate of 3.06% at September 30, 2018 and 3.27% at December 31, 2017	195		240
Other non-recourse debt:
Various floating rate non-recourse borrowings due between February 2019 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.64% (between 3.34% and 4.23%) at September 30, 2018 and 2.88% (between 2.50% and 3.54%) at December 31, 2017	178		185
Fixed rate non-recourse borrowings due December 2026 which had an interest rate of 5.34% at September 30, 2018 and December 31, 2017	34		36
Total debt issued by other MUAH subsidiaries	1,073		1,355
Total long-term debt	$	12,796	$	12,162

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

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

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

The following tables present financial assets and financial liabilities measured at fair value on a recurring basis at September 30, 2018 and December 31, 2017, by major category and by valuation hierarchy level.

	September 30, 2018
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets(2):
U.S. Treasury securities	$	—		$	2,968		$	—		$	—		$	2,968
U.S. government-sponsored agency securities	—			115			—			—			115
State and municipal securities	—			11			—			—			11
Commercial paper	—			335			—			—			335
Corporate bonds	—			1,428			—			—			1,428
Asset-backed securities	—			262			—			—			262
Mortgage-backed securities	—			5,511			—			—			5,511
Equities	122			—			—			—			122
Interest rate derivative contracts	32			422			—			(121		)	333
Commodity derivative contracts	—			42			—			(28		)	14
Foreign exchange derivative contracts	1			226			—			(117		)	110
Equity derivative contracts	1			—			43			(40		)	4
Total trading account assets	156			11,320			43			(306		)	11,213
Securities available for sale(3):
Asset Liability Management securities:
U.S. Treasury	—			3,730			—			—			3,730
Residential mortgage-backed securities:
U.S government and government-sponsored agencies	—			8,501			—			—			8,501
Privately issued	—			861			—			—			861
Privately issued - commercial mortgage-backed securities	—			1,078			—			—			1,078
Collateralized loan obligations	—			1,434			—			—			1,434
Other	—			4			—			—			4
Other debt securities:
Direct bank purchase bonds	—			—			1,281			—			1,281
Other	—			44			144			—			188
Total securities available for sale	—			15,652			1,425			—			17,077
Other assets:
Mortgage servicing rights(2)	—			—			176			—			176
Interest rate hedging contracts(3)	—			4			—			—			4
Other derivative contracts(2)	—			1			—			—			1
Equity securities(2)	9			—			—			—			9
Total other assets	9			5			176			—			190
Total assets	$	165		$	26,977		$	1,644		$	(306	)	$	28,480
Percentage of total	—		%	95		%	6		%	(1		)%	100		%
Percentage of total Company assets	—			17			1			—			18
Liabilities
Trading account liabilities(2):
Securities sold, not yet purchased:
U.S. Treasury	$	—		$	2,518		$	—		$	—		$	2,518
Commercial paper	—			22			—			—			22
Corporate bonds	—			853			—			—			853
Equities	88			—			—			—			88
Trading derivatives:
Interest rate derivative contracts	3			627			—			(217		)	413
Commodity derivative contracts	—			33			—			(24		)	9
Foreign exchange derivative contracts	1			127			—			(49		)	79
Equity derivative contracts	4			—			43			—			47
Total trading account liabilities	96			4,180			43			(290		)	4,029
Other liabilities:
FDIC clawback liability(2)	—			—			115			—			115
Other derivative contracts(2)	—			21			4			(19		)	6
Total other liabilities	—			21			119			(19		)	121
Total liabilities	$	96		$	4,201		$	162		$	(309	)	$	4,150
Percentage of total	2		%	101		%	4		%	(7		)%	100		%
Percentage of total Company liabilities	—			3			—			—			3

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

(2) Fair value through net income.

(3) Fair value through other comprehensive income.

	December 31, 2017
(Dollars in millions)	Level 1			Level 2			Level 3			Netting Adjustment(1)			Fair Value
Assets
Trading account assets(2):
U.S. Treasury securities	$	—		$	1,926		$	—		$	—		$	1,926
U.S. government-sponsored agency securities	—			118			—			—			118
State and municipal securities	—			11			—			—			11
Commercial paper	—			7			—			—			7
Other sovereign government obligations	—			8			—			—			8
Corporate bonds	—			1,054			—			—			1,054
Asset-backed securities	—			199			—			—			199
Mortgage-backed securities	—			6,339			—			—			6,339
Equities	193			—			—			—			193
Interest rate derivative contracts	7			870			1			(353		)	525
Commodity derivative contracts	—			50			—			(49		)	1
Foreign exchange derivative contracts	—			249			1			(68		)	182
Equity derivative contracts	2			—			137			(135		)	4
Total trading account assets	202			10,831			139			(605		)	10,567
Securities available for sale(3):
Asset Liability Management securities:
U.S. Treasury	—			3,252			—			—			3,252
Residential mortgage-backed securities:
U.S government and government-sponsored agencies	—			9,208			—			—			9,208
Privately issued	—			694			—			—			694
Privately issued - commercial mortgage-backed securities	—			822			—			—			822
Collateralized loan obligations	—			1,905			—			—			1,905
Other	—			5			—			—			5
Other debt securities:
Direct bank purchase bonds	—			—			1,503			—			1,503
Other	—			68			96			—			164
Equity securities	10			—			—			—			10
Total securities available for sale	10			15,954			1,599			—			17,563
Other assets:
Mortgage servicing rights(2)	—			—			64			—			64
Interest rate hedging contracts(3)	—			2			—			—			2
Other derivative contracts(2)	—			2			1			(2		)	1
Total other assets	—			4			65			(2		)	67
Total assets	$	212		$	26,789		$	1,803		$	(607	)	$	28,197
Percentage of total	1		%	95		%	6		%	(2		)%	100		%
Percentage of total Company assets	—			17			1			—			18
Liabilities
Trading account liabilities(2):
Securities sold, not yet purchased:
U.S. Treasury	$	—		$	2,709		$	—		$	—		$	2,709
Other sovereign government obligations	—			7			—			—			7
Corporate bonds	—			348			—			—			348
Equities	35			—			—			—			35
Trading derivatives:
Interest rate derivative contracts	3			643			—			(382		)	264
Commodity derivative contracts	—			33			—			(20		)	13
Foreign exchange derivative contracts	1			144			1			(66		)	80
Equity derivative contracts	7			—			137			—			144
Total trading account liabilities	46			3,884			138			(468		)	3,600
Other liabilities:
FDIC clawback liability(2)	—			—			113			—			113
Interest rate hedging contracts(3)	—			149			—			(149		)	—
Other derivative contracts(2)	—			3			6			(3		)	6
Total other liabilities	—			152			119			(152		)	119
Total liabilities	$	46		$	4,036		$	257		$	(620	)	$	3,719
Percentage of total	1		%	109		%	7		%	(17		)%	100		%
Percentage of total Company liabilities	—			3			—			—			3

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

(2) Fair value through net income.

(3) Fair value through other comprehensive income.

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

The following tables present a reconciliation of the assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2018 and 2017. Level 3 available for sale securities at September 30, 2018 and 2017 primarily consist of direct bank purchase bonds.

	For the Three Months Ended
	September 30, 2018														September 30, 2017
(Dollars in millions)	Trading Account Assets			Securities Available for Sale			Other Assets		Trading Account Liabilities			Other Liabilities			Trading Account Assets			Securities Available for Sale			Other Assets			Trading Account Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	50		$	1,495		$	149	$	(49	)	$	(119	)	$	171		$	1,572		$	49		$	(169	)	$	(118	)
Total gains (losses) - realized/unrealized:
Included in income before taxes	6			—			2		(7		)	—			17			—			(1		)	(17		)	(1		)
Included in other comprehensive income	—			(1		)	—		—			—			—			3			—			—			—
Purchases/additions	—			52			25		—			—			—			4			9			—			—
Settlements	(13		)	(121		)	—		13			—			(24		)	(10		)	—			24			—
Asset (liability) balance, end of period	$	43		$	1,425		$	176	$	(43	)	$	(119	)	$	164		$	1,569		$	57		$	(162	)	$	(119	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	6		$	—		$	2	$	(7	)	$	—		$	17		$	—		$	(1	)	$	(17	)	$	(1	)

	For the Nine Months Ended
	September 30, 2018														September 30, 2017
(Dollars in millions)	Trading Account Assets			Securities Available for Sale			Other Assets		Trading Account Liabilities			Other Liabilities			Trading Account Assets			Securities Available for Sale			Other Assets			Trading Account Liabilities			Other Liabilities
Asset (liability) balance, beginning of period	$	139		$	1,600		$	65	$	(138	)	$	(119	)	$	168		$	1,638		$	24		$	(166	)	$	(121	)
Total gains (losses) - realized/unrealized):
Included in income before taxes	—			—			11		(1		)	—			58			—			(3		)	(57		)	2
Included in other comprehensive income	—			(18		)	—		—			—			—			15			—			—			—
Purchases/additions	—			125			100		—			—			—			6			36			—			—
Settlements	(96		)	(282		)	—		96			—			(62		)	(90		)	—			61			—
Asset (liability) balance, end of period	$	43		$	1,425		$	176	$	(43	)	$	(119	)	$	164		$	1,569		$	57		$	(162	)	$	(119	)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$	—		$	—		$	11	$	(1	)	$	—		$	58		$	—		$	(3	)	$	(57	)	$	2

Significant Unobservable Inputs Level 3 Assets and Liabilities

The following table presents information about significant unobservable inputs related to the Company’s significant Level 3 assets and liabilities at September 30, 2018.

	September 30, 2018
(Dollars in millions)	Level 3 Fair Value		Valuation Technique	Significant Unobservable Input(s)	Range of Inputs		Weighted Average
Securities available for sale:
Direct bank purchase bonds	$	1,281	Return on equity	Market-required return on capital	8.0 - 10.0	%	9.5	%
				Probability of default	0.0 - 25.0		0.3
				Loss severity	10.0 - 60.0		24.3

Financial Assets Measured at Fair Value on Nonrecurring Basis

For assets measured at fair value on a nonrecurring basis during the three and nine months ended September 30, 2018 and 2017 that were still held on the consolidated balance sheet as of the respective periods ended, the following tables present the fair value of such assets by the level of valuation assumptions used to determine each fair value adjustment.

	September 30, 2018								For the Three Months Ended September 30, 2018			For the Nine Months Ended September 30, 2018
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3		Gains (Losses)			Gains (Losses)
Loans held for investment
Impaired loans	$	183	$	—	$	—	$	183	$	(59	)	$	(73	)
Other assets
Software	—		—		—		—		(1		)	(3		)
Private equity investments	10		—		—		10		—			(2		)
Renewable energy investment	2		—		—		2		—			(2		)
Consolidated LIHC VIE	48		—		—		48		—			(8		)
Total	$	243	$	—	$	—	$	243	$	(60	)	$	(88	)

	September 30, 2017								For the Three Months Ended September 30, 2017			For the Nine Months Ended September 30, 2017
(Dollars in millions)	Fair Value		Level 1		Level 2		Level 3		Gains (Losses)			Gains (Losses)
Loans held for investment
Impaired loans	$	97	$	—	$	—	$	97	$	(21	)	$	(42	)
Other assets
Software	—		—		—		—		(1		)	(4		)
Loans held for sale	7		—		—		7		(1		)	(3		)
Renewable energy investment	—		—		—		—		—			2
Consolidated LIHC VIE	81		—		—		81		(3		)	(11		)
Total	$	185	$	—	$	—	$	185	$	(26	)	$	(58	)

Carrying Amount and Estimated Fair Value of Financial Instruments

The tables below present the carrying amount and estimated fair value of certain financial instruments, all of which are accounted for at amortized cost, classified by valuation hierarchy level at September 30, 2018 and December 31, 2017.

	September 30, 2018
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	4,192	$	4,192	$	4,192	$	—	$	—
Securities borrowed or purchased under resale agreements	21,265		21,262		—		21,262		—
Securities held to maturity	11,320		10,972		—		10,972		—
Loans held for investment(1)	81,765		81,445		—		—		81,445
Other assets	18		18		18		—		—
Liabilities
Time deposits	$	9,957	$	9,899	$	—	$	9,899	$	—
Securities loaned or sold under repurchase agreements	27,032		27,030		—		27,030		—
Commercial paper and other short-term borrowings	8,309		8,309		—		8,309		—
Long-term debt	12,796		12,764		—		12,764		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	102	$	230	$	—	$	—	$	230

(1) Excludes lease financing. The carrying amount is net of the allowance for loan losses.

	December 31, 2017
(Dollars in millions)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents	$	3,392	$	3,392	$	3,392	$	—	$	—
Securities borrowed or purchased under resale agreements	20,894		20,894		—		20,894		—
Securities held to maturity	9,885		9,799		—		9,799		—
Loans held for investment(1)	78,023		79,051		—		—		79,051
Liabilities
Deposits	$	84,787	$	84,743	$	—	$	84,743	$	—
Securities loaned or sold under repurchase agreements	26,437		26,437		—		26,437		—
Commercial paper and other short-term borrowings	7,066		7,066		—		7,066		—
Long-term debt	12,162		12,162		—		12,162		—
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit	$	174	$	174	$	—	$	—	$	174

(1) Excludes lease financing. The carrying amount is net of the allowance for loan losses.

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Derivative Instruments and Other Financial Instruments Used For Hedging (Tables)

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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

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 as hedging instruments at September 30, 2018 and December 31, 2017. Asset and liability values are presented gross, excluding the impact of legally enforceable master netting and credit support annex 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.

	September 30, 2018						December 31, 2017
			Fair Value						Fair Value
(Dollars in millions)	Notional Amount		Asset Derivatives		Liability Derivatives		Notional Amount		Asset Derivatives		Liability Derivatives
Derivative instruments
Cash flow hedges:
Interest rate contracts	$	179	$	4	$	—	$	6,998	$	2	$	149
Fair value hedges:
Interest rate contracts	—		—		—		500		—		—
Not designated as hedging instruments:
Trading:
Interest rate contracts	120,613		454		630		132,214		878		646
Commodity contracts	453		42		33		1,244		50		33
Foreign exchange contracts	8,099		227		128		7,053		250		146
Equity contracts	503		44		47		1,496		139		144
Other contracts	39		—		—		4		—		—
Total Trading	129,707		767		838		142,011		1,317		969
Other risk management	1,232		1		25		1,345		3		9
Total derivative instruments	$	131,118	$	772	$	863	$	150,854	$	1,322	$	1,127

Amount and Location of Gains and Losses for Derivatives Designated as Cash Flow Hedges

The following tables present the amount and location of the net gains and losses recorded in the Company’s consolidated statements of income and changes in stockholders' equity for derivatives designated as cash flow hedges for the three and nine months ended September 30, 2018 and 2017.

	Gains (Losses) Recognized in OCI (Effective Portion)					Gains (Losses) Reclassified from AOCI into Income (Effective Portion)						(Gains) Losses Recognized in Income (Ineffective Portion)
	For the Three Months Ended September 30,					For the Three Months Ended September 30,						For the Three Months Ended September 30,
(Dollars in millions)	2018		2017		Location	2018			2017		Location	2018		2017
Derivatives in cash flow hedging relationships
					Interest income	$	(11	)	$	11
Interest rate contracts	$	—	$	6	Interest expense	—			—		Noninterest expense	$	—	$	—
Total	$	—	$	6		$	(11	)	$	11		$	—	$	—

	Gains (Losses) Recognized in OCI (Effective Portion)						Gains (Losses) Reclassified from AOCI into Income (Effective Portion)						Gains (Losses) Recognized in Income (Ineffective Portion)
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017		Location	2018			2017		Location	2018			2017
Derivatives in cash flow hedging relationships
						Interest income	$	(19	)	$	60
Interest rate contracts	$	(98	)	$	42	Interest expense	—			—		Noninterest expense	$	(1	)	$	3
Total	$	(98	)	$	42		$	(19	)	$	60		$	(1	)	$	3

Schedule of derivative gains (losses) on the Company's fair value hedges

The following tables present the gains (losses) on the Company's fair value hedges and hedged item for the three and nine months ended September 30, 2018 and 2017.

	For the Three Months Ended September 30, 2018						For the Nine Months Ended September 30, 2018
(Dollars in millions)	Derivative		Hedged Item		Hedge Ineffectiveness		Derivative			Hedged Item		Hedge Ineffectiveness
Interest rate risk on long-term debt	$	—	$	—	$	—	$	(2	)	$	2	$	—
Total	$	—	$	—	$	—	$	(2	)	$	2	$	—

	For the Three Months Ended September 30, 2017							For the Nine Months Ended September 30, 2017
(Dollars in millions)	Derivative			Hedged Item		Hedge Ineffectiveness		Derivative			Hedged Item		Hedge Ineffectiveness
Interest rate risk on long-term debt	$	(1	)	$	1	$	—	$	(2	)	$	1	$	(1	)
Total	$	(1	)	$	1	$	—	$	(2	)	$	1	$	(1	)

Gain or (Loss) Recognized in Income on Derivative Instruments

The following table presents the amount of the net gains and losses for derivative instruments classified as trading reported in the consolidated statements of income under the heading trading account activities for the three and nine months ended September 30, 2018 and 2017.

	Gains (Losses) Recognized in Income on Trading Derivatives					Gains (Losses) Recognized in Income on Trading Derivatives
	For the Three Months Ended					For the Nine Months Ended
(Dollars in millions)	September 30, 2018		September 30, 2017			September 30, 2018		September 30, 2017
Trading derivatives
Interest rate contracts	$	64	$	(11	)	$	194	$	(69	)
Equity contracts	5		—			23		—
Foreign exchange contracts	11		11			32		32
Commodity contracts	—		—			—		1
Total	$	80	$	—		$	249	$	(36	)

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Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Components of Accumulated Other Comprehensive Loss

The following tables present the change in each of the components of accumulated other comprehensive income and the related tax effect of the change allocated to each component for the three and nine months endedSeptember 30, 2018 and 2017.

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended September 30, 2018
Cash flow hedge activities:
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	$	11		$	(3	)	$	8
Net change	11			(3		)	8
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	(70		)	19			(51		)
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(1		)	—			(1		)
Amortization of net unrealized (gains) losses on held to maturity securities	8			(2		)	6
Net change	(63		)	17			(46		)
Pension and other benefits:
Amortization of prior service credit(1)	(10		)	2			(8		)
Recognized net actuarial (gain) loss(1)	24			(6		)	18
Net change	14			(4		)	10
Net change in AOCI	$	(38	)	$	10		$	(28	)

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

(Dollars in millions)	Before Tax Amount			Tax Effect			Net of Tax
For the Three Months Ended September 30, 2017
Cash flow hedge activities:
Unrealized net gains (losses) on hedges arising during the period	$	6		$	(2	)	$	4
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt	(11		)	4			(7		)
Net change	(5		)	2			(3		)
Securities:
Unrealized holding gains (losses) arising during the period on securities available for sale	32			(14		)	18
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net	(6		)	2			(4		)
Less: accretion of fair value adjustment on securities available for sale	(1		)	—			(1		)
Amortization of net unrealized (gains) losses on held to maturity securities	6			(2		)	4
Net change	31			(14		)	17
Foreign currency translation adjustment	7			(3		)	4
Pension and other benefits:
Amortization of prior service credit(1)	(12		)	5			(7		)
Recognized net actuarial (gain) loss(1)	21			(7		)	14
Net change	9			(2		)	7
Other	1			—			1
Net change in AOCI	$	43		$	(17	)	$	26

(1) These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".

Change in Accumulated Other Comprehensive Loss Balances

The following tables present the change in accumulated other comprehensive loss balances.

For the Three Months Ended September 30, 2017 and 2018:
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Postretirement Benefits Adjustment			Other			Accumulated Other Comprehensive Income (Loss)
(Dollars in millions)
Balance, June 30, 2017	$	(85	)	$	(149	)	$	(19	)	$	(576	)	$	—		$	(829	)
Other comprehensive income (loss) before reclassifications	4			18			4			—			—			26
Amounts reclassified from AOCI	(7		)	(1		)	—			7			1			—
Balance, September 30, 2017	$	(88	)	$	(132	)	$	(15	)	$	(569	)	$	1		$	(803	)
Balance, June 30, 2018	$	(240	)	$	(464	)	$	—		$	(580	)	$	(1	)	$	(1,285	)
Other comprehensive income (loss) before reclassifications	—			(51		)	—			—			—			(51		)
Amounts reclassified from AOCI	8			5			—			10			—			23
Balance, September 30, 2018	$	(232	)	$	(510	)	$	—		$	(570	)	$	(1	)	$	(1,313	)

For the Nine Months Ended September 30, 2017 and 2018:
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Securities			Foreign Currency Translation Adjustment			Pension and Other Postretirement Benefits Adjustment			Other			Accumulated Other Comprehensive Income (Loss)
(Dollars in millions)
Balance, December 31, 2016	$	(77	)	$	(208	)	$	(22	)	$	(589	)	$	—		$	(896	)
Other comprehensive income (loss) before reclassifications	26			77			7			—			—			110
Amounts reclassified from AOCI	(37		)	(1		)	—			20			1			(17		)
Balance, September 30, 2017	$	(88	)	$	(132	)	$	(15	)	$	(569	)	$	1		$	(803	)
Balance, December 31, 2017	$	(174	)	$	(233	)	$	(19	)	$	(600	)	$	—		$	(1,026	)
Other comprehensive income (loss) before reclassifications	(72		)	(289		)	(2		)	—			(1		)	(364		)
Amounts reclassified from AOCI	14			12			—			30			—			56
Transfer to additional paid-in capital(1)	—			—			21			—			—			21
Balance, September 30, 2018	$	(232	)	$	(510	)	$	—		$	(570	)	$	(1	)	$	(1,313	)

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Employee Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

The following tables summarize the components of net periodic benefit cost for the three and nine months ended September 30, 2018 and 2017. The components of net periodic benefit cost other than the service cost component are included in other noninterest expense in the income statement.

	Pension Benefits						Other Postretirement Benefits						Superannuation, SERP and ESBP
	For the Three Months Ended   September 30,						For the Three Months Ended   September 30,						For the Three Months Ended   September 30,
(Dollars in millions)	2018			2017			2018			2017			2018		2017
Components of net periodic benefit cost:
Service cost	$	21		$	18		$	—		$	1		$	—	$	—
Interest cost	25			25			2			2			1		1
Expected return on plan assets	(67		)	(64		)	(6		)	(5		)	—		—
Amortization of prior service credit	(7		)	(7		)	(3		)	(5		)	—		—
Recognized net actuarial loss	21			19			2			2			1		—
Total net periodic benefit (income) cost	$	(7	)	$	(9	)	$	(5	)	$	(5	)	$	2	$	1

	Pension Benefits						Other Postretirement Benefits						Superannuation, SERP and ESBP
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
(Dollars in millions)	2018			2017			2018			2017			2018		2017
Components of net periodic benefit cost:
Service cost	$	60		$	53		$	3		$	4		$	—	$	—
Interest cost	75			75			6			6			2		2
Expected return on plan assets	(201		)	(191		)	(16		)	(14		)	—		—
Amortization of prior service credit	(20		)	(20		)	(11		)	(16		)	—		—
Recognized net actuarial loss	65			59			4			6			3		2
Total net periodic benefit (income) cost	$	(21	)	$	(24	)	$	(14	)	$	(14	)	$	5	$	4

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Commitments, Contingencies and Guarantees (Tables)

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Summary of Commitments

The following table summarizes the Company's commitments.

(Dollars in millions)	September 30, 2018
Commitments to extend credit	$	34,125
Issued standby and commercial letters of credit	4,858
Commitments to enter into forward-starting resale agreements	1,300
Other commitments	493

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Business Segments (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of reportable business segments

As of and for the Three Months Ended September 30, 2018:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	553	$	104		$	66		$	52	$	57		$	832
Noninterest income	111		103			15			94		303			626
Total revenue	664		207			81			146		360			1,458
Noninterest expense	518		106			65			121		249			1,059
(Reversal of) provision for credit losses	45		27			(3		)	—		(5		)	64
Income (loss) before income taxes and including noncontrolling interests	101		74			19			25		116			335
Income tax expense (benefit) (1)	17		(3		)	5			6		10			35
Net income (loss) including noncontrolling interests	84		77			14			19		106			300
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		6			6
Net income (loss) attributable to MUAH	$	84	$	77		$	14		$	19	$	112		$	306
Total assets, end of period	$	71,501	$	19,467		$	882		$	33,366	$	35,820		$	161,036

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

As of and for the Three Months Ended September 30, 2017:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other		MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	516	$	107		$	64		$	62	$	67	$	816
Noninterest income	108		91			19			100		197		515
Total revenue	624		198			83			162		264		1,331
Noninterest expense	487		98			56			119		222		982
(Reversal of) provision for credit losses	19		(9		)	(1		)	—		9		18
Income (loss) before income taxes and including noncontrolling interests	118		109			28			43		33		331
Income tax expense (benefit) (1)	31		19			11			18		30		109
Net income (loss) including noncontrolling interests	87		90			17			25		3		222
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		10		10
Net income (loss) attributable to MUAH	$	87	$	90		$	17		$	25	$	13	$	232
Total assets, end of period	$	66,025	$	20,813		$	1,042		$	32,538	$	34,434	$	154,852

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

As of and for the Nine Months Ended September 30, 2018:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking		Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	1,620	$	307	$	197		$	157	$	201		$	2,482
Noninterest income	338		283		44			259		680			1,604
Total revenue	1,958		590		241			416		881			4,086
Noninterest expense	1,552		310		186			353		825			3,226
(Reversal of) provision for loan losses	52		3		(4		)	—		(8		)	43
Income (loss) before income taxes and including noncontrolling interests	354		277		59			63		64			817
Income tax expense (benefit) (1)	68		133		16			15		(211		)	21
Net income (loss) including noncontrolling interests	286		144		43			48		275			796
Deduct: net (income) loss from noncontrolling interests	—		—		—			—		20			20
Net income (loss) attributable to MUAH	$	286	$	144	$	43		$	48	$	295		$	816
Total assets, end of period	$	71,501	$	19,467	$	882		$	33,366	$	35,820		$	161,036

(1) Income tax expense (benefit) includes certain management accounting classification adjustments.

As of and for the Nine Months Ended September 30, 2017:
(Dollars in millions)	Regional Bank		U.S. Wholesale & Investment Banking			Transaction Banking			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations
Net interest income	$	1,527	$	333		$	179		$	178	$	188		$	2,405
Noninterest income	326		296			48			272		550			1,492
Total revenue	1,853		629			227			450		738			3,897
Noninterest expense	1,483		298			171			336		657			2,945
(Reversal of) provision for loan losses	39		(51		)	(1		)	—		(21		)	(34		)
Income (loss) before income taxes and including noncontrolling interests	331		382			57			114		102			986
Income tax expense (benefit) (1)	87		89			23			45		11			255
Net income (loss) including noncontrolling interests	244		293			34			69		91			731
Deduct: net (income) loss from noncontrolling interests	—		—			—			—		25			25
Net income (loss) attributable to MUAH	$	244	$	293		$	34		$	69	$	116		$	756
Total assets, end of period	$	66,025	$	20,813		$	1,042		$	32,538	$	34,434		$	154,852

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Summary of Significant Accounting Policies and Nature of Operations - Schedule of Impact Resulted from ASU 2017-07 Adoption (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Salaries and employee benefits	$ 652	$ 621	$ 2,000	$ 1,881
Other	$ 105	94	$ 304	267
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Salaries and employee benefits		589		1,790
Other		126		358
ASU 2017-07 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Salaries and employee benefits		32		91
Other		$ (32)		$ (91)

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Securities - Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses, and Fair Values of Securities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Securities available for sale
Amortized Cost	$ 17,621	$ 17,794
Gross Unrealized Gains	32	58
Gross Unrealized Losses	576	289
Securities Available for Sale	17,077	17,563
U.S. Treasury
Securities available for sale
Amortized Cost	3,964	3,370
Gross Unrealized Gains	0	0
Gross Unrealized Losses	234	118
Securities Available for Sale	3,730	3,252
U.S. government agency and government-sponsored agencies
Securities available for sale
Amortized Cost	8,739	9,338
Gross Unrealized Gains	2	2
Gross Unrealized Losses	240	132
Securities Available for Sale	8,501	9,208
Privately issued
Securities available for sale
Amortized Cost	891	695
Gross Unrealized Gains	0	3
Gross Unrealized Losses	30	4
Securities Available for Sale	861	694
Privately issued - commercial mortgage-backed securities
Securities available for sale
Amortized Cost	1,109	823
Gross Unrealized Gains	0	4
Gross Unrealized Losses	31	5
Securities Available for Sale	1,078	822
Collateralized loan obligations
Securities available for sale
Amortized Cost	1,434	1,895
Gross Unrealized Gains	1	10
Gross Unrealized Losses	1	0
Securities Available for Sale	1,434	1,905
Other
Securities available for sale
Amortized Cost	4	5
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Securities Available for Sale	4	5
Asset Liability Management securities
Securities available for sale
Amortized Cost	16,141	16,126
Gross Unrealized Gains	3	19
Gross Unrealized Losses	536	259
Securities Available for Sale	15,608	15,886
Direct bank purchase bonds
Securities available for sale
Amortized Cost	1,292	1,495
Gross Unrealized Gains	28	38
Gross Unrealized Losses	39	30
Securities Available for Sale	1,281	1,503
Other
Securities available for sale
Amortized Cost	188	163
Gross Unrealized Gains	1	1
Gross Unrealized Losses	1	0
Securities Available for Sale	$ 188	164
Equity securities
Securities available for sale
Amortized Cost		10
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Securities Available for Sale		$ 10

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Securities - Securities Available for Sale with a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	$ 7,208	$ 5,561
Securities available for sale, Less than 12 months, Unrealized Losses	139	44
Securities available for sale, 12 months or more, Fair Value	7,270	7,586
Securities available for sale, 12 months or more, Unrealized Losses	437	245
Securities available for sale, Fair Value, Total	14,478	13,147
Securities available for sale, Unrealized Losses, Total	576	289
U.S. Treasury
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	869	1,074
Securities available for sale, Less than 12 months, Unrealized Losses	20	14
Securities available for sale, 12 months or more, Fair Value	2,813	2,128
Securities available for sale, 12 months or more, Unrealized Losses	214	104
Securities available for sale, Fair Value, Total	3,682	3,202
Securities available for sale, Unrealized Losses, Total	234	118
U.S. government agency and government-sponsored agencies
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	3,996	3,606
Securities available for sale, Less than 12 months, Unrealized Losses	71	22
Securities available for sale, 12 months or more, Fair Value	3,572	4,651
Securities available for sale, 12 months or more, Unrealized Losses	169	110
Securities available for sale, Fair Value, Total	7,568	8,257
Securities available for sale, Unrealized Losses, Total	240	132
Privately issued
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	642	275
Securities available for sale, Less than 12 months, Unrealized Losses	19	1
Securities available for sale, 12 months or more, Fair Value	193	164
Securities available for sale, 12 months or more, Unrealized Losses	11	3
Securities available for sale, Fair Value, Total	835	439
Securities available for sale, Unrealized Losses, Total	30	4
Privately issued - commercial mortgage-backed securities
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	679	447
Securities available for sale, Less than 12 months, Unrealized Losses	17	3
Securities available for sale, 12 months or more, Fair Value	299	80
Securities available for sale, 12 months or more, Unrealized Losses	14	2
Securities available for sale, Fair Value, Total	978	527
Securities available for sale, Unrealized Losses, Total	31	5
Collateralized loan obligations
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	606	12
Securities available for sale, Less than 12 months, Unrealized Losses	1	0
Securities available for sale, 12 months or more, Fair Value	0	0
Securities available for sale, 12 months or more, Unrealized Losses	0	0
Securities available for sale, Fair Value, Total	606	12
Securities available for sale, Unrealized Losses, Total	1	0
Asset Liability Management securities
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	6,792	5,414
Securities available for sale, Less than 12 months, Unrealized Losses	128	40
Securities available for sale, 12 months or more, Fair Value	6,877	7,023
Securities available for sale, 12 months or more, Unrealized Losses	408	219
Securities available for sale, Fair Value, Total	13,669	12,437
Securities available for sale, Unrealized Losses, Total	536	259
Direct bank purchase bonds
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	307	58
Securities available for sale, Less than 12 months, Unrealized Losses	10	4
Securities available for sale, 12 months or more, Fair Value	393	563
Securities available for sale, 12 months or more, Unrealized Losses	29	26
Securities available for sale, Fair Value, Total	700	621
Securities available for sale, Unrealized Losses, Total	39	30
Other
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value	109	79
Securities available for sale, Less than 12 months, Unrealized Losses	1	0
Securities available for sale, 12 months or more, Fair Value	0	0
Securities available for sale, 12 months or more, Unrealized Losses	0	0
Securities available for sale, Fair Value, Total	109	79
Securities available for sale, Unrealized Losses, Total	$ 1	0
Equity securities
Securities available for sale
Securities available for sale, Less than 12 months, Fair Value		10
Securities available for sale, Less than 12 months, Unrealized Losses		0
Securities available for sale, 12 months or more, Fair Value		0
Securities available for sale, 12 months or more, Unrealized Losses		0
Securities available for sale, Fair Value, Total		10
Securities available for sale, Unrealized Losses, Total		$ 0

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Securities - Fair Value of Debt Securities Available for Sale by Contractual Maturity (Details) $ in Millions	Sep. 30, 2018 USD ($)
Securities available for sale
One Year or Less	$ 113
Over One Year Through Five Years	1,904
Over Five Years Through Ten Years	5,093
Over Ten Years	9,967
Total Fair Value	17,077
U.S. Treasury
Securities available for sale
One Year or Less	0
Over One Year Through Five Years	1,163
Over Five Years Through Ten Years	2,567
Over Ten Years	0
Total Fair Value	3,730
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities
Securities available for sale
One Year or Less	0
Over One Year Through Five Years	266
Over Five Years Through Ten Years	1,354
Over Ten Years	6,881
Total Fair Value	8,501
Privately issued
Securities available for sale
One Year or Less	0
Over One Year Through Five Years	0
Over Five Years Through Ten Years	0
Over Ten Years	861
Total Fair Value	861
Privately issued - commercial mortgage-backed securities
Securities available for sale
One Year or Less	0
Over One Year Through Five Years	0
Over Five Years Through Ten Years	42
Over Ten Years	1,036
Total Fair Value	1,078
Collateralized loan obligations
Securities available for sale
One Year or Less	0
Over One Year Through Five Years	2
Over Five Years Through Ten Years	389
Over Ten Years	1,043
Total Fair Value	1,434
Other
Securities available for sale
One Year or Less	1
Over One Year Through Five Years	3
Over Five Years Through Ten Years	0
Over Ten Years	0
Total Fair Value	4
Asset Liability Management securities
Securities available for sale
One Year or Less	1
Over One Year Through Five Years	1,434
Over Five Years Through Ten Years	4,352
Over Ten Years	9,821
Total Fair Value	15,608
Direct bank purchase bonds
Securities available for sale
One Year or Less	112
Over One Year Through Five Years	301
Over Five Years Through Ten Years	741
Over Ten Years	127
Total Fair Value	1,281
Other
Securities available for sale
One Year or Less	0
Over One Year Through Five Years	169
Over Five Years Through Ten Years	0
Over Ten Years	19
Total Fair Value	$ 188

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Securities - Gross Realized Gains and Losses from Sales of Available for Sale Securities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 1	$ 6	$ 4	$ 15

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Securities - Schedule of Held to Maturity Securities Recognized and Not Recognized in Other Comprehensive Income (OCI) and Fair Values (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Securities held to maturity
Held to Maturity Securities Amortized Cost	$ 11,464	$ 9,966
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	2	2
Total, Unrealized Losses, Recognized in OCI	146	83
Held-to-maturity Securities	11,320	9,885
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	13	54
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI	361	140
Securities held to maturity	10,972	9,799
U.S. Treasury
Securities held to maturity
Held to Maturity Securities Amortized Cost	527	525
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	0	0
Total, Unrealized Losses, Recognized in OCI	0	0
Held-to-maturity Securities	527	525
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	2	3
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI	3	1
Securities held to maturity	526	527
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities
Securities held to maturity
Held to Maturity Securities Amortized Cost	8,651	7,870
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	2	2
Total, Unrealized Losses, Recognized in OCI	101	31
Held-to-maturity Securities	8,552	7,841
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	3	15
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI	337	130
Securities held to maturity	8,218	7,726
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities
Securities held to maturity
Held to Maturity Securities Amortized Cost	1,514	1,571
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	0	0
Total, Unrealized Losses, Recognized in OCI	45	52
Held-to-maturity Securities	1,469	1,519
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	8	36
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI	20	9
Securities held to maturity	$ 1,457	$ 1,546

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Securities - Securities Held to Maturity with a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Securities held to maturity
Less than 12 months, Fair Value	$ 4,013	$ 3,162
Less than 12 months, Unrealized Losses, Recognized in OCI	28	0
Less than 12 months, Unrealized Losses, Not Recognized in OCI	78	32
12 months or more, Fair Value	6,711	5,496
12 months or more, Unrealized Losses, Recognized in OCI	118	83
12 months or more, Unrealized Losses, Not Recognized in OCI	283	108
Total, Fair Value	10,724	8,658
Total, Unrealized Losses, Recognized in OCI	146	83
Total, Unrealized Losses, Not Recognized in OCI	361	140
Securities held to maturity	10,972	9,799
Held-to-maturity Securities	11,320	9,885
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	13	54
Held to Maturity Securities Amortized Cost	11,464	9,966
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	2	2
U.S. Treasury securities
Securities held to maturity
Less than 12 months, Fair Value	494	494
Less than 12 months, Unrealized Losses, Recognized in OCI	0	0
Less than 12 months, Unrealized Losses, Not Recognized in OCI	3	1
12 months or more, Fair Value	0	0
12 months or more, Unrealized Losses, Recognized in OCI	0	0
12 months or more, Unrealized Losses, Not Recognized in OCI	0	0
Total, Fair Value	494	494
Total, Unrealized Losses, Recognized in OCI	0	0
Total, Unrealized Losses, Not Recognized in OCI	3	1
Securities held to maturity	526	527
Held-to-maturity Securities	527	525
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	2	3
Held to Maturity Securities Amortized Cost	527	525
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	0	0
US Government Agencies Debt Securities [Member]
Securities held to maturity
Less than 12 months, Fair Value	720
Less than 12 months, Unrealized Losses, Recognized in OCI	0
Less than 12 months, Unrealized Losses, Not Recognized in OCI	1
12 months or more, Fair Value	0
12 months or more, Unrealized Losses, Recognized in OCI	0
12 months or more, Unrealized Losses, Not Recognized in OCI	0
Total, Fair Value	720
Total, Unrealized Losses, Recognized in OCI	0
Total, Unrealized Losses, Not Recognized in OCI	1
Securities held to maturity	771
Held-to-maturity Securities	772
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0
Held to Maturity Securities Amortized Cost	772
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	0
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities
Securities held to maturity
Less than 12 months, Fair Value	2,753	2,649
Less than 12 months, Unrealized Losses, Recognized in OCI	28	0
Less than 12 months, Unrealized Losses, Not Recognized in OCI	73	31
12 months or more, Fair Value	5,300	4,000
12 months or more, Unrealized Losses, Recognized in OCI	73	31
12 months or more, Unrealized Losses, Not Recognized in OCI	264	99
Total, Fair Value	8,053	6,649
Total, Unrealized Losses, Recognized in OCI	101	31
Total, Unrealized Losses, Not Recognized in OCI	337	130
Securities held to maturity	8,218	7,726
Held-to-maturity Securities	8,552	7,841
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	3	15
Held to Maturity Securities Amortized Cost	8,651	7,870
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	2	2
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities
Securities held to maturity
Less than 12 months, Fair Value	46	19
Less than 12 months, Unrealized Losses, Recognized in OCI	0	0
Less than 12 months, Unrealized Losses, Not Recognized in OCI	1	0
12 months or more, Fair Value	1,411	1,496
12 months or more, Unrealized Losses, Recognized in OCI	45	52
12 months or more, Unrealized Losses, Not Recognized in OCI	19	9
Total, Fair Value	1,457	1,515
Total, Unrealized Losses, Recognized in OCI	45	52
Total, Unrealized Losses, Not Recognized in OCI	20	9
Securities held to maturity	1,457	1,546
Held-to-maturity Securities	1,469	1,519
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	8	36
Held to Maturity Securities Amortized Cost	1,514	1,571
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income	$ 0	$ 0

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Securities - Carrying Amount and Fair Value of Securities Held to Maturity by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Securities held to maturity
Within One Year, Carrying Amount	$ 566
Within One Year, Fair Value	565
Over One Year Through Five Years, Carrying Amount	803
Over One Year Through Five Years, Fair Value	806
Over Five Years Through Ten Years, Carrying Amount	1,830
Over Five Years Through Ten Years, Fair Value	1,793
Over Ten Years, Carrying Amount	8,121
Over Ten Years, Fair Value	7,808
Total securities held to maturity, carrying amount	11,320	$ 9,885
Securities held to maturity	10,972	9,799
U.S. Treasury
Securities held to maturity
Within One Year, Carrying Amount	518
Within One Year, Fair Value	516
Over One Year Through Five Years, Carrying Amount	9
Over One Year Through Five Years, Fair Value	10
Over Five Years Through Ten Years, Carrying Amount	0
Over Five Years Through Ten Years, Fair Value	0
Over Ten Years, Carrying Amount	0
Over Ten Years, Fair Value	0
Total securities held to maturity, carrying amount	527	525
Securities held to maturity	526	527
US Government Agencies Debt Securities [Member]
Securities held to maturity
Within One Year, Carrying Amount	0
Within One Year, Fair Value	0
Over One Year Through Five Years, Carrying Amount	0
Over One Year Through Five Years, Fair Value	0
Over Five Years Through Ten Years, Carrying Amount	772
Over Five Years Through Ten Years, Fair Value	771
Over Ten Years, Carrying Amount	0
Over Ten Years, Fair Value	0
Total securities held to maturity, carrying amount	772
Securities held to maturity	771
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities
Securities held to maturity
Within One Year, Carrying Amount	0
Within One Year, Fair Value	0
Over One Year Through Five Years, Carrying Amount	0
Over One Year Through Five Years, Fair Value	0
Over Five Years Through Ten Years, Carrying Amount	1,058
Over Five Years Through Ten Years, Fair Value	1,022
Over Ten Years, Carrying Amount	7,494
Over Ten Years, Fair Value	7,196
Total securities held to maturity, carrying amount	8,552	7,841
Securities held to maturity	8,218	$ 7,726
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities
Securities held to maturity
Within One Year, Carrying Amount	48
Within One Year, Fair Value	49
Over One Year Through Five Years, Carrying Amount	794
Over One Year Through Five Years, Fair Value	796
Over Five Years Through Ten Years, Carrying Amount	0
Over Five Years Through Ten Years, Fair Value	0
Over Ten Years, Carrying Amount	627
Over Ten Years, Fair Value	612
Total securities held to maturity, carrying amount	1,469
Securities held to maturity	$ 1,457

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Securities - Securities Pledged and Received as Collateral (Narrative) (Details) - USD ($) $ in Billions	Sep. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Available for sale and trading securities pledged as collateral	$ 12.7	$ 12.3
Available for sale and trading securities permitted to be sold or repledged	1.6	1.2
Securities received as collateral	29.3	31.8
Securities received as collateral permitted to be sold or repledged	29.3	$ 31.8
Securities received as collateral that have been sold or repledged	$ 28.3

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Loans and Allowance for Loan Losses - Summary of Loans (Details) - USD ($) $ in Millions		Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Loans disclosures
Loans held for investment	[1]	$ 83,653		$ 80,014
Allowance for loan losses		(501)	$ (445)	(476)	$ (542)	$ (513)	$ (639)
Loans held for investment, net		83,152		79,538
Net unamortized discounts and premiums and deferred fees and costs		338		301
Commercial
Loans disclosures
Loans held for investment		41,277		40,909
Allowance for loan losses		(395)	(362)	(360)	(431)	(435)	(556)
Consumer
Loans disclosures
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans		42,370		39,097
Loans held for investment		42,376		39,105
Allowance for loan losses		(96)	$ (78)	(86)	$ (81)	$ (78)	$ (83)
Commercial and industrial | Commercial Loans
Loans disclosures
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans		23,349		23,281
Commercial mortgage | Commercial Loans
Loans disclosures
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans		15,031		14,320
Construction | Commercial Loans
Loans disclosures
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans		1,480		1,775
Lease financing | Commercial Loans
Loans disclosures
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans		1,417		1,533
Residential mortgage | Consumer Loans
Loans disclosures
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans		38,059		35,643
Home equity and other consumer loans | Consumer Loans
Loans disclosures
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans		$ 4,317		$ 3,462

[1] Includes $338 million and $301 million at September 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.

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Loans and Allowance for Loan Losses - Reconciliation of Changes in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period		$ 542	$ 639	$ 476	$ 639
(Reversal of) provision for loan losses	$ 62	33		44	(1)
Other		2	2
Loans charged-off	(16)	(17)		(42)	(123)
Recoveries of loans previously charged-off	10	11		23	25
Allowance for loan losses, end of period	501		513	501
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period		431	556	360	556
(Reversal of) provision for loan losses	33	(7)		32	(57)
Other		2
Loans charged-off	(8)	(7)
Recoveries of loans previously charged-off	8	8			21
Allowance for loan losses, end of period	395		435	395
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period		81	83	86	83
(Reversal of) provision for loan losses	24	10		32	26
Other		0
Loans charged-off	(8)	(10)
Recoveries of loans previously charged-off	2	3			4
Allowance for loan losses, end of period	96		78	96
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period		30	0	30	0
(Reversal of) provision for loan losses	5	30		(20)	30
Other		0
Loans charged-off	0	0		0	0
Recoveries of loans previously charged-off	0	$ 0		0	0
Allowance for loan losses, end of period	$ 10		$ 0	10
Commercial Loans
Allowance for Loan and Lease Losses [Roll Forward]
Loans charged-off				(15)	(91)
Recoveries of loans previously charged-off				18
Consumer Loans
Allowance for Loan and Lease Losses [Roll Forward]
Loans charged-off				(27)	$ (32)
Recoveries of loans previously charged-off				$ 5

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Loans and Allowance for Loan Losses - Allowance for Loan Losses and Related Loan Balances by Portfolio Segment (Details) - USD ($) $ in Millions		Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Loan losses allowance
Individually evaluated for impairment		$ 129		$ 73
Collectively evaluated for impairment		372		403
Total allowance for loan losses		501	$ 445	476	$ 542	$ 513	$ 639
Loans held for investment:
Individually evaluated for impairment		786		865
Collectively evaluated for impairment		82,867		79,149
Loans held for investment	[1]	83,653		80,014
Commercial
Loan losses allowance
Total allowance for loan losses		395	362	360	431	435	556
Loans held for investment:
Loans held for investment		41,277		40,909
Consumer
Loan losses allowance
Total allowance for loan losses		96	78	86	81	78	83
Loans held for investment:
Loans held for investment		42,376		39,105
Unallocated
Loan losses allowance
Total allowance for loan losses		10	$ 5	30	$ 30	$ 0	$ 0
Loans held for investment:
Individually evaluated for impairment		0
Collectively evaluated for impairment		0
Loans held for investment		0
Unallocated
Loan losses allowance
Individually evaluated for impairment		0		0
Collectively evaluated for impairment		10		30
Total allowance for loan losses				30
Loans held for investment:
Individually evaluated for impairment				0
Collectively evaluated for impairment				0
Loans held for investment				0
Commercial Loans
Loan losses allowance
Individually evaluated for impairment		116		58
Collectively evaluated for impairment		279		302
Loans held for investment:
Individually evaluated for impairment		497		544
Collectively evaluated for impairment		40,780		40,365
Consumer Loans
Loan losses allowance
Individually evaluated for impairment		13		15
Collectively evaluated for impairment		83		71
Loans held for investment:
Individually evaluated for impairment		289		321
Collectively evaluated for impairment		$ 42,087		$ 38,784

[1] Includes $338 million and $301 million at September 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.

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Loans and Allowance for Loan Losses - Summary of Nonaccrual Loans (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Nonaccrual loans
Nonaccrual loans	$ 411	$ 465
Troubled debt restructured loans that continue to accrue interest	354	348
Troubled debt restructured nonaccrual loans (included in the total nonaccrual loans above)	252	229
Commercial
Nonaccrual loans
Nonaccrual loans	280	339
Consumer
Nonaccrual loans
Nonaccrual loans	131	126
Residential mortgage | Consumer Loans
Nonaccrual loans
Nonaccrual loans	111	104
Home equity and other consumer loans | Consumer Loans
Nonaccrual loans
Nonaccrual loans	20	22
Commercial mortgage | Commercial Loans
Nonaccrual loans
Nonaccrual loans	12	20
Commercial and industrial | Commercial Loans
Nonaccrual loans
Nonaccrual loans	$ 268	$ 319

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Loans and Allowance for Loan Losses - Aging of Balance of Loans Held for Investment By Class (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Aging of loans
Current		$ 83,242	$ 79,687
Total past due		411	327
Loans held for investment	[1]	83,653	80,014
Loans 90 days or more past due and still accruing		11	12
30 to 89 Days Past Due
Aging of loans
Total past due		257	207
90 Days or More Past Due
Aging of loans
Total past due		154	120
Commercial
Aging of loans
Current		41,103	40,807
Total past due		174	102
Loans held for investment		41,277	40,909
Commercial | Commercial and industrial
Aging of loans
Total past due		132	80
Loans held for investment		24,766	24,814
Commercial | Commercial mortgage
Aging of loans
Total past due		42	22
Loans held for investment		15,031	14,320
Commercial | Construction
Aging of loans
Total past due		0	0
Loans held for investment		1,480	1,775
Commercial | 30 to 89 Days Past Due
Aging of loans
Total past due		69	33
Commercial | 90 Days or More Past Due
Aging of loans
Total past due		105	69
Consumer
Aging of loans
Current		42,139	38,880
Total past due		237	225
Loans held for investment		42,376	39,105
Consumer | Residential mortgage
Aging of loans
Total past due		204	190
Loans held for investment		38,059	35,643
Consumer | Home equity and other consumer loans
Aging of loans
Total past due		33	35
Loans held for investment		4,317	3,462
Consumer | 30 to 89 Days Past Due
Aging of loans
Total past due		188	174
Consumer | 90 Days or More Past Due
Aging of loans
Total past due		49	51
Home equity and other consumer loans | Consumer Loans
Aging of loans
Current		4,284	3,427
30 to 89 Days Past Due		22	23
90 Days or More Past Due		11	12
Residential mortgage | Consumer Loans
Aging of loans
Current		37,855	35,453
30 to 89 Days Past Due		166	151
90 Days or More Past Due		38	39
Commercial mortgage | Commercial Loans
Aging of loans
Current		14,989	14,298
30 to 89 Days Past Due		38	16
90 Days or More Past Due		4	6
Commercial and industrial | Commercial Loans
Aging of loans
Current		24,634	24,734
30 to 89 Days Past Due		31	17
90 Days or More Past Due		101	63
Construction | Commercial Loans
Aging of loans
Current		1,480	1,775
30 to 89 Days Past Due		0	0
90 Days or More Past Due		$ 0	$ 0

[1] Includes $338 million and $301 million at September 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.

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Loans and Allowance for Loan Losses - Loans in Commercial Portfolio Segment Monitored for Credit Quality Based on Regulatory Risk Ratings (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Commercial
Aging of loans
Total loans	$ 41,277	$ 40,909
Commercial | Pass
Aging of loans
Total loans	39,769	39,345
Commercial | Special Mention
Aging of loans
Total loans	508	530
Commercial | Classified
Aging of loans
Total loans	1,000	1,034
Commercial | Commercial and industrial
Aging of loans
Total loans	24,766	24,814
Commercial | Commercial mortgage
Aging of loans
Total loans	15,031	14,320
Commercial | Construction
Aging of loans
Total loans	1,480	1,775
Commercial mortgage | Commercial Loans | Pass
Aging of loans
Total loans	14,769	14,081
Commercial mortgage | Commercial Loans | Special Mention
Aging of loans
Total loans	100	80
Commercial mortgage | Commercial Loans | Classified
Aging of loans
Total loans	162	159
Commercial and industrial | Commercial Loans | Pass
Aging of loans
Total loans	23,602	23,632
Commercial and industrial | Commercial Loans | Special Mention
Aging of loans
Total loans	404	435
Commercial and industrial | Commercial Loans | Classified
Aging of loans
Total loans	760	747
Construction | Commercial Loans | Pass
Aging of loans
Total loans	1,398	1,632
Construction | Commercial Loans | Special Mention
Aging of loans
Total loans	4	15
Construction | Commercial Loans | Classified
Aging of loans
Total loans	$ 78	$ 128

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Loans and Allowance for Loan Losses - Loans in Consumer Portfolio an Purchased credit-impaired loans (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Consumer portfolio loans
Nonaccrual	$ 411	$ 465
Consumer
Consumer portfolio loans
Loans covered by FDIC loss share agreements	6	8
Accrual	42,239	38,971
Nonaccrual	131	126
Total loans held for investment, before purchased credit-impaired loans	42,370	39,097
Consumer | Residential Mortgage
Consumer portfolio loans
Total loans held for investment, before purchased credit-impaired loans	38,055	35,638
Consumer | Home equity and other consumer loans
Consumer portfolio loans
Total loans held for investment, before purchased credit-impaired loans	4,315	3,459
Residential Mortgage | Consumer Loans Portfolio Segment [Member]
Consumer portfolio loans
Accrual	37,944	35,534
Nonaccrual	111	104
Home equity and other consumer loans | Consumer Loans Portfolio Segment [Member]
Consumer portfolio loans
Accrual	4,295	3,437
Nonaccrual	$ 20	$ 22

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Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Segment Based on Refreshed FICO Scores (Details) - USD ($) $ in Millions		9 Months Ended		12 Months Ended
		Sep. 30, 2018		Dec. 31, 2017
Consumer Loans
Credit quality of consumer loans
Percentage of total		100.00%		100.00%
Consumer
Credit quality of consumer loans
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements		$ 41,924		$ 38,685
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		34,285		31,190
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		7,139		7,000
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	[1]	500		495
Consumer | Residential mortgage
Credit quality of consumer loans
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements		37,668		35,279
Consumer | 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		$ 4,256		$ 3,406
FICO Score 720 and Above | Consumer Loans
Credit quality of consumer loans
Percentage of total		82.00%		81.00%
FICO Score 720 and Above | Residential mortgage | Consumer Loans
Credit quality of consumer loans
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements		$ 31,284		$ 28,786
FICO Score 720 and Above | Home equity and other consumer loans | Consumer Loans
Credit quality of consumer loans
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements		$ 3,001		$ 2,404
FICO Score Below 720 | Consumer Loans
Credit quality of consumer loans
Percentage of total		17.00%		18.00%
FICO Score Below 720 | Residential mortgage | Consumer Loans
Credit quality of consumer loans
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements		$ 5,939		$ 6,082
FICO Score Below 720 | Home equity and other consumer loans | Consumer Loans
Credit quality of consumer loans
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements		$ 1,200		$ 918
No FICO Available | Consumer Loans
Credit quality of consumer loans
Percentage of total		1.00%	[1]	1.00%
No FICO Available | Residential mortgage | Consumer Loans
Credit quality of consumer loans
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements		$ 445		$ 411
No FICO Available | Home equity and other consumer loans | Consumer Loans
Credit quality of consumer loans
Loan balances, excluding loans serviced by third parties and loans covered by FDIC loss share agreements		$ 55		$ 84

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

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Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Segment Based on Refreshed LTV ratios (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Consumer Loans
Credit quality of consumer loans
Percentage of total loans categorized by LTV ratio		100.00%	100.00%
Consumer
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 39,902	$ 37,636
Consumer | Less than or Equal to 80 Percent
Credit quality of consumer loans
Loans categorized by LTV ratio		38,964	36,524
Consumer | Greater than 80 and Less than 100 Percent
Credit quality of consumer loans
Loans categorized by LTV ratio		869	1,019
Consumer | Greater than or Equal to 100 Percent
Credit quality of consumer loans
Loans categorized by LTV ratio		16	28
Consumer | No LTV Available
Credit quality of consumer loans
Loans categorized by LTV ratio	[1]	53	65
Consumer | Residential mortgage
Credit quality of consumer loans
Loans categorized by LTV ratio		37,668	35,279
Consumer | Home equity loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 2,234	$ 2,357
Less than or Equal to 80 Percent | Consumer Loans
Credit quality of consumer loans
Percentage of total loans categorized by LTV ratio		98.00%	97.00%
Less than or Equal to 80 Percent | Home Equity Line of Credit [Member] | Consumer Loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 1,979	$ 2,052
Less than or Equal to 80 Percent | Residential mortgage | Consumer Loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 36,985	$ 34,472
Greater than 80 and Less than 100 Percent | Consumer Loans
Credit quality of consumer loans
Percentage of total loans categorized by LTV ratio		2.00%	3.00%
Greater than 80 and Less than 100 Percent | Home Equity Line of Credit [Member] | Consumer Loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 215	$ 248
Greater than 80 and Less than 100 Percent | Residential mortgage | Consumer Loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 654	$ 771
Greater than or Equal to 100 Percent | Consumer Loans
Credit quality of consumer loans
Percentage of total loans categorized by LTV ratio		0.00%	0.00%
Greater than or Equal to 100 Percent | Home Equity Line of Credit [Member] | Consumer Loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 12	$ 24
Greater than or Equal to 100 Percent | Residential mortgage | Consumer Loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 4	$ 4
No LTV Available | Consumer Loans
Credit quality of consumer loans
Percentage of total loans categorized by LTV ratio		0.00%	0.00%
No LTV Available | Home Equity Line of Credit [Member] | Consumer Loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 28	$ 33
No LTV Available | Residential mortgage | Consumer Loans
Credit quality of consumer loans
Loans categorized by LTV ratio		$ 25	$ 32

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

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Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Pre- and Post - modification recorded investments
Commitment to lend additional funds to borrowers with loan modifications classified as TDRs	$ 39		$ 66
Financing Receivable, Modifications, Recorded Investment	606	$ 577
Commercial
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment	384	337
Consumer
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment	222	240
Construction | Commercial Loans
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment	78	128
Home equity and other consumer loans | Consumer Loans
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment	22	25
Residential mortgage | Consumer Loans
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment	200	215
Commercial mortgage | Commercial Loans
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment	53	7
Commercial and industrial | Commercial Loans
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment	$ 253	$ 202

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Loans and Allowance for Loan Losses - Pre- and Post-Modification Outstanding Recorded Investment Amounts of Troubled Debt Restructurings (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment		$ 606		$ 606		$ 577
Pre-Modification Outstanding Recorded Investment	[1]	64	$ 28	171	$ 196
Post-Modification Outstanding Recorded Investment	[2]	64	28	171	196
Commercial
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment		384		384		337
Pre-Modification Outstanding Recorded Investment	[1]	59	22	163	180
Post-Modification Outstanding Recorded Investment	[2]	59	22	163	180
Commercial | Commercial and industrial
Pre- and Post - modification recorded investments
Pre-Modification Outstanding Recorded Investment		59	20	163	116
Post-Modification Outstanding Recorded Investment		59	20	163	116
Commercial | Commercial mortgage
Pre- and Post - modification recorded investments
Pre-Modification Outstanding Recorded Investment			2		3
Post-Modification Outstanding Recorded Investment			2		3
Commercial | Construction
Pre- and Post - modification recorded investments
Pre-Modification Outstanding Recorded Investment			0		61
Post-Modification Outstanding Recorded Investment			0		61
Consumer
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment		222		222		240
Pre-Modification Outstanding Recorded Investment	[1]	5	6	8	16
Post-Modification Outstanding Recorded Investment	[2]	5	6	8	16
Consumer | Residential mortgage
Pre- and Post - modification recorded investments
Pre-Modification Outstanding Recorded Investment		4	6	6	14
Post-Modification Outstanding Recorded Investment		4	6	6	14
Consumer | Home equity and other consumer loans
Pre- and Post - modification recorded investments
Pre-Modification Outstanding Recorded Investment			0		2
Post-Modification Outstanding Recorded Investment			$ 0		$ 2
Construction | Commercial Loans Portfolio Segment [Member]
Pre- and Post - modification recorded investments
Financing Receivable, Modifications, Recorded Investment		$ 78		$ 78		$ 128

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

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

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Loans and Allowance for Loan Losses - Recorded Investment Amounts of Troubled Debt Restructurings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Troubled debt restructured loans
Minimum defaulting period			60 days
Total troubled debt restructured loans at date of default	$ 0	$ 1	$ 2	$ 22
Commercial
Troubled debt restructured loans
Total troubled debt restructured loans at date of default		0		20
Commercial | Commercial and industrial
Troubled debt restructured loans
Total troubled debt restructured loans at date of default		0
Commercial | Commercial Real Estate [Member]
Troubled debt restructured loans
Total troubled debt restructured loans at date of default		0
Consumer
Troubled debt restructured loans
Total troubled debt restructured loans at date of default	0	1	2	2
Consumer | Residential mortgage
Troubled debt restructured loans
Total troubled debt restructured loans at date of default	$ 0	$ 1
Commercial and industrial | Commercial Loans Portfolio Segment [Member]
Troubled debt restructured loans
Total troubled debt restructured loans at date of default				19
Commercial mortgage | Commercial Loans Portfolio Segment [Member]
Troubled debt restructured loans
Total troubled debt restructured loans at date of default				1
Residential mortgage | Consumer Loans
Troubled debt restructured loans
Total troubled debt restructured loans at date of default			$ 2	$ 2

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Loans and Allowance for Loan Losses - Information about Impaired Loans by Class (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Loan impairment
Recorded investment with an allowance	$ 618	$ 567
Recorded investment without an allowance	168	298
Impaired loans	786	865
Allowance for impaired loans	129	73
Unpaid principal balance with an allowance	679	645
Unpaid principal balance without an allowance	260	326
Commercial
Loan impairment
Recorded investment with an allowance	415	320
Recorded investment without an allowance	82	224
Impaired loans	497	544
Allowance for impaired loans	116	58
Unpaid principal balance with an allowance	466	381
Unpaid principal balance without an allowance	151	233
Commercial | Commercial and industrial
Loan impairment
Impaired loans	343	380
Commercial | Commercial mortgage
Loan impairment
Impaired loans	77	36
Commercial | Construction
Loan impairment
Recorded investment with an allowance	70	0
Impaired loans	77	128
Allowance for impaired loans	4	0
Unpaid principal balance with an allowance	70	0
Consumer
Loan impairment
Recorded investment with an allowance	203	247
Recorded investment without an allowance	86	74
Impaired loans	289	321
Allowance for impaired loans	13	15
Unpaid principal balance with an allowance	213	264
Unpaid principal balance without an allowance	109	93
Consumer | Residential mortgage
Loan impairment
Impaired loans	253	277
Consumer | Home equity and other consumer loans
Loan impairment
Impaired loans	36	44
Home equity and other consumer loans | Consumer Loans
Loan impairment
Recorded investment with an allowance	23	29
Recorded investment without an allowance	13	15
Allowance for impaired loans	0	0
Unpaid principal balance with an allowance	23	30
Unpaid principal balance without an allowance	22	24
Commercial mortgage | Commercial Loans Portfolio Segment [Member]
Loan impairment
Recorded investment with an allowance	24	33
Recorded investment without an allowance	53	3
Allowance for impaired loans	0	1
Unpaid principal balance with an allowance	24	33
Unpaid principal balance without an allowance	53	3
Commercial and industrial | Commercial Loans Portfolio Segment [Member]
Loan impairment
Recorded investment with an allowance	321	287
Recorded investment without an allowance	22	93
Allowance for impaired loans	112	57
Unpaid principal balance with an allowance	372	348
Unpaid principal balance without an allowance	91	102
Construction loans portfolio [Member] | Construction
Loan impairment
Recorded investment without an allowance	7	128
Unpaid principal balance without an allowance	7	128
Residential mortgage | Consumer Loans
Loan impairment
Recorded investment with an allowance	180	218
Recorded investment without an allowance	73	59
Allowance for impaired loans	13	15
Unpaid principal balance with an allowance	190	234
Unpaid principal balance without an allowance	$ 87	$ 69

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Loans and Allowance for Loan Losses - Average Investment in Impaired Loans and Interest Income Recognized for Impaired Loans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Loan impairment
Average Recorded Investment	$ 779	$ 860	$ 771	$ 937
Recognized Interest Income	14	21	50	66
Commercial
Loan impairment
Average Recorded Investment	486	502	468	572
Recognized Interest Income	11	17	38	51
Consumer
Loan impairment
Average Recorded Investment	293	358	303	365
Recognized Interest Income	3	4	12	15
Commercial and industrial | Commercial
Loan impairment
Average Recorded Investment	329	397
Recognized Interest Income	3	4
ERROR in label resolution. | Commercial
Loan impairment
Average Recorded Investment	79	96
Recognized Interest Income	5	11
Residential mortgage | Consumer
Loan impairment
Average Recorded Investment	257	305
Recognized Interest Income	3	3
Construction | Commercial
Loan impairment
Average Recorded Investment	78	9
Recognized Interest Income	3	2
Home equity and other consumer loans | Consumer
Loan impairment
Average Recorded Investment	36	53
Recognized Interest Income	$ 0	$ 1
Commercial and industrial | Commercial Loans Portfolio Segment [Member]
Loan impairment
Average Recorded Investment			306	466
Recognized Interest Income			8	15
Construction | Commercial Loans Portfolio Segment [Member]
Loan impairment
Average Recorded Investment			106	12
Recognized Interest Income			7	3
Home equity and other consumer loans | Consumer Loans
Loan impairment
Average Recorded Investment			39	55
Recognized Interest Income			2	5
Residential mortgage | Consumer Loans
Loan impairment
Average Recorded Investment			264	310
Recognized Interest Income			10	10
Commercial mortgage | Commercial Loans Portfolio Segment [Member]
Loan impairment
Average Recorded Investment			56	94
Recognized Interest Income			$ 23	$ 33

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Loans and Allowance for Loan Losses - Loan Transfers from Held to Investment to Held for Sale and Proceeds from Sales of Loans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Loans disclosures
Net Transfer of Loans Held for Investment to (from) Loans Held for Sale	$ 77	$ 477	$ 10	$ 833
Proceeds from Sale	49	105	563	751
Commercial
Loans disclosures
Net Transfer of Loans Held for Investment to (from) Loans Held for Sale	77	477	10	837
Proceeds from Sale	49	105	563	751
Consumer
Loans disclosures
Net Transfer of Loans Held for Investment to (from) Loans Held for Sale	0	0	0	(4)
Proceeds from Sale	$ 0	$ 0	$ 0	$ 0

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Variable Interest Entities - Consolidated VIEs (Details) $ in Millions	Sep. 30, 2018 USD ($) investment	Dec. 31, 2017 USD ($)
Variable Interest Entities
Interest bearing deposits in banks	$ 2,308	$ 1,335
Consolidated Assets
Other Assets	8,892	8,800
Consolidated Liabilities
Other Liabilities	2,237	2,143
Consolidated VIEs
Variable Interest Entities
Interest bearing deposits in banks	0	1
Consolidated Assets
Loans Held for Investment, Net	569	583
Other Assets	188	226
Total Assets	757	810
Consolidated Liabilities
Other Liabilities	14	24
Total Liabilities	14	24
Consolidated VIEs | LIHC investments
Variable Interest Entities
Interest bearing deposits in banks	0	0
Consolidated Assets
Loans Held for Investment, Net	0	0
Other Assets	48	68
Total Assets	48	68
Consolidated Liabilities
Other Liabilities	0	0
Total Liabilities	$ 0	0
Number of LIHC investment fund | investment	2
Consolidated VIEs | Leasing investments
Variable Interest Entities
Interest bearing deposits in banks	$ 0	1
Consolidated Assets
Loans Held for Investment, Net	569	583
Other Assets	140	158
Total Assets	709	742
Consolidated Liabilities
Other Liabilities	14	24
Total Liabilities	$ 14	$ 24

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Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Unconsolidated Assets
Interest Bearing Deposits in Banks		$ 2,308		$ 1,335
Securities Available for Sale		17,077		17,563
Loans held for investment	[1]	83,653		80,014
Other Assets		8,892		8,800
Unconsolidated Liabilities
Other Liabilities		2,237		2,143
Unconsolidated VIEs
Unconsolidated Assets
Interest Bearing Deposits in Banks		30		1
Securities Available for Sale		28		29
Loans held for investment		262		276
Other Assets		2,458		2,799
Total Assets		2,778		3,105
Unconsolidated Liabilities
Other Liabilities		220		307
Total Liabilities		220		307
Maximum Exposure to Loss		2,840		3,208
Unconsolidated VIEs | LIHC investments
Variable Interest Entities
Liabilities Assumed		45	$ 22
Unconsolidated Assets
Interest Bearing Deposits in Banks		0		0
Securities Available for Sale		28		29
Loans held for investment		236		228
Other Assets		971		1,028
Total Assets		1,235		1,285
Unconsolidated Liabilities
Other Liabilities		176		254
Total Liabilities		176		254
Maximum Exposure to Loss		1,235		1,284
Unconsolidated VIEs | Leasing investments
Unconsolidated Assets
Interest Bearing Deposits in Banks		30		1
Securities Available for Sale		0		0
Loans held for investment		21		24
Other Assets		1,453		1,745
Total Assets		1,504		1,770
Unconsolidated Liabilities
Other Liabilities		44		53
Total Liabilities		44		53
Maximum Exposure to Loss		1,525		1,792
Unconsolidated VIEs | Other investments
Unconsolidated Assets
Interest Bearing Deposits in Banks		0		0
Securities Available for Sale		0		0
Loans held for investment		5		24
Other Assets		34		26
Total Assets		39		50
Unconsolidated Liabilities
Other Liabilities		0		0
Total Liabilities		0		0
Maximum Exposure to Loss		$ 80		$ 132

[1] Includes $338 million and $301 million at September 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.

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Variable Interest Entities - Unconsolidated LIHC Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Non Interest Expenses
Noncontrolling Interest [Line Items]
Losses from LIHC investments included in other noninterest expense	$ 2	$ 4	$ 6	$ 8
Income Tax Expense
Noncontrolling Interest [Line Items]
Amortization of LIHC investments included in income tax expense	34	37	102	106
Tax credits and other tax benefits from LIHC investments included in income tax expense	$ 39	$ 49	$ 130	$ 141

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Securities Financing Arrangements - Secured Borrowings by Contractual Maturity and Class of Collateral Pledged (Details) - USD ($) $ in Millions	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	$ 37,134		$ 37,388
Securities loaned	496		879
Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	22,849
Securities loaned	285		446
Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	3,339
Securities loaned	170		332
31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	9,050
Securities loaned	41		101
Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	1,400
Securities loaned	0		0
U.S. Treasury securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	13,494		12,818
U.S. Treasury securities | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	12,283		8,244
U.S. Treasury securities | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	648		2,370
U.S. Treasury securities | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	313		1,046
U.S. Treasury securities | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	250		1,158
U.S. government-sponsored agency securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	301		216
U.S. government-sponsored agency securities | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	119		115
U.S. government-sponsored agency securities | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	166		38
U.S. government-sponsored agency securities | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	16		63
U.S. government-sponsored agency securities | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		0
Other sovereign government obligations
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			4
Other sovereign government obligations | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			0
Other sovereign government obligations | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			0
Other sovereign government obligations | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			4
Other sovereign government obligations | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			0
Money market securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	289		7
Money market securities | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		1
Money market securities | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		0
Money market securities | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	289		6
Money market securities | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		0
Asset-backed securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase		$ 242	196
Asset-backed securities | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		32
Asset-backed securities | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		0
Asset-backed securities | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	242		164
Asset-backed securities | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		0
Mortgage-backed securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	18,992		19,403
Securities loaned	211
Mortgage-backed securities | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	8,808		8,322
Securities loaned	0
Mortgage-backed securities | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	2,325		4,972
Securities loaned	170
Mortgage-backed securities | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	6,709		5,859
Securities loaned	41
Mortgage-backed securities | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	1,150		250
Securities loaned	0
Corporate bonds
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	2,290		2,325
Securities loaned			322
Corporate bonds | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	1,346		580
Securities loaned			0
Corporate bonds | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	131		620
Securities loaned			322
Corporate bonds | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	813		1,125
Securities loaned			0
Corporate bonds | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		0
Securities loaned			0
State and municipal securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	504		559
State and municipal securities | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	44		283
State and municipal securities | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	66		0
State and municipal securities | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	394		276
State and municipal securities | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		0
Equity securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	526		981
Securities loaned	285		557
Equity securities | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	249		416
Securities loaned	285		446
Equity securities | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	3		376
Securities loaned	0		10
Equity securities | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	274		189
Securities loaned	0		101
Equity securities | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0		0
Securities loaned	0		0
Trading securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	$ 36,638		36,509
Trading securities | Overnight and continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			17,993
Trading securities | Up to 30 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			8,376
Trading securities | 31-90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			8,732
Trading securities | Greater than 90 days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase			$ 1,408

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Securities Financing Arrangements - Schedule of Offsetting Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivative assets
Gross Amounts of Recognized Assets	$ 772	$ 1,322
Gross Amounts Offset in Balance Sheet	306	607
Net Amounts Presented in Balance Sheet	466	715
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	18	25
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	448	690
Securities borrowed or purchased under resale agreements
Gross Amounts of Recognized Assets	31,367	31,845
Gross Amounts Offset in Balance Sheet	10,102	10,951
Net Amounts Presented in Balance Sheet	21,265	20,894
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	21,179	20,816
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	86	78
Total Financial Assets
Gross Amounts of Recognized Assets	32,139	33,167
Gross Amounts Offset in Balance Sheet	10,408	11,558
Net Amounts Presented in Balance Sheet	21,731	21,609
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	21,197	20,841
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	534	768
Derivative liabilities
Gross Amounts of Recognized Liabilities	863	1,127
Gross Amounts Offset in Balance Sheet	309	620
Net Amounts Presented in Balance Sheet	554	507
Gross Amount Not Offset in Balance Sheet, Financial Instruments	50	142
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	504	365
Securities loaned or sold under repurchase agreements
Gross Amounts of Recognized Assets/Liabilities	37,134	37,388
Gross Amounts Offset in Balance Sheet	10,102	10,951
Net Amounts Presented in Balance Sheet	27,032	26,437
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	26,250	25,639
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	782	798
Total Financial Liabilities
Gross Amounts of Recognized Assets/Liabilities	37,997	38,515
Gross Amounts Offset in Balance Sheet	10,411	11,571
Net Amounts Presented in Balance Sheet	27,586	26,944
Gross Amount Not Offset in Balance Sheet, Financial Instruments	26,300	25,781
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	$ 1,286	$ 1,163

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Commercial Paper and Other Short-Term Borrowings (Details) $ in Millions, ¥ in Billions	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 JPY (¥)	Dec. 31, 2017 USD ($)
Short-term Debt [Line Items]
Total commercial paper and other short-term borrowings	$ 8,309		$ 7,066
MUFG Union Bank N.A
Short-term Debt [Line Items]
Total commercial paper and other short-term borrowings	$ 7,293		$ 6,097
MUFG Union Bank N.A | Commercial paper
Short-term Debt [Line Items]
Weighted average interest rate at period end	2.08%	2.08%	1.26%
Commercial paper	$ 293		$ 347
MUFG Union Bank N.A | Federal Home Loan Bank Advances
Short-term Debt [Line Items]
Weighted average interest rate at period end	2.22%	2.22%	1.42%
Federal home loan bank advances	$ 7,000		$ 5,750
MUFG Americas Holding Corporation
Short-term Debt [Line Items]
Weighted average interest rate at period end	2.67%	2.67%	1.88%
Total commercial paper and other short-term borrowings	$ 1,016		$ 969
Short-term debt due to parent	$ 150		$ 168
MUFG Americas Holding Corporation | Affiliated Entity
Short-term Debt [Line Items]
Weighted average interest rate at period end	(0.07%)	(0.07%)	(0.09%)
Short term debt due to affiliates	$ 866	¥ 98	$ 801
Line of Credit | MUFG Americas Holding Corporation
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 1,400	¥ 160
Line of credit facility, extension period (in days)	100 days

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Long-Term Debt (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Mar. 31, 2018
Debt Instrument
Long-term debt	$ 12,796		$ 12,162
Proceeds from issuance of long-term debt	4,058	$ 4,122
Parent Company [Member]
Debt Instrument
Long-term debt	6,298		6,997
Parent Company [Member] | Senior debt obligations | Floating rate senior notes due February 2018. These notes, which bore interest at 0.57% above 3-month LIBOR, had a rate of 1.97% at December 31, 2017
Debt Instrument
Long-term debt	$ 0		$ 250
Long-term debt, weighted average interest rate (as a percent)	0.00%		1.97%
Parent Company [Member] | Senior debt obligations | Floating rate senior notes due February 2018. These notes, which bore interest at 0.57% above 3-month LIBOR, had a rate of 1.97% at December 31, 2017 | London Interbank Offered Rate LIBOR
Debt Instrument
Interest rate above variable interest rate (as a percent)	0.00%		0.57%
Parent Company [Member] | Senior debt obligations | Fixed rate 1.625% notes due February 2018
Debt Instrument
Long-term debt	$ 0		$ 450
Debt instrument, fixed interest rate (as a percent)	0.00%		1.63%
Parent Company [Member] | Senior debt obligations | Fixed rate 2.25% notes due February 2020
Debt Instrument
Long-term debt	$ 999		$ 998
Debt instrument, fixed interest rate (as a percent)	2.25%		2.25%
Parent Company [Member] | Senior debt obligations | Fixed rate 3.50% notes due June 2022
Debt Instrument
Long-term debt	$ 398		$ 398
Debt instrument, fixed interest rate (as a percent)	3.50%		3.50%
Parent Company [Member] | Senior debt obligations | Fixed rate 3.00% notes due February 2025
Debt Instrument
Long-term debt	$ 496		$ 496
Debt instrument, fixed interest rate (as a percent)	3.00%		3.00%
Parent Company [Member] | Senior debt obligations | Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 3.19% at September 30, 2018 and 2.45% at December 31, 2017
Debt Instrument
Long-term debt	$ 545		$ 545
Long-term debt, weighted average interest rate (as a percent)	3.19%		2.45%
Parent Company [Member] | Senior debt obligations | Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 3.19% at September 30, 2018 and 2.45% at December 31, 2017 | London Interbank Offered Rate LIBOR
Debt Instrument
Interest rate above variable interest rate (as a percent)	0.86%		0.86%
Parent Company [Member] | Senior debt obligations | Floating rate debt due September 2020. This note, which bears interest at 0.85% above 3-month LIBOR, had a rate of 3.18% at September 30, 2018 and 2.54% at December 31, 2017
Debt Instrument
Long-term debt	$ 3,500		$ 3,500
Long-term debt, weighted average interest rate (as a percent)	3.18%		2.54%
Parent Company [Member] | Senior debt obligations | Floating rate debt due September 2020. This note, which bears interest at 0.85% above 3-month LIBOR, had a rate of 3.18% at September 30, 2018 and 2.54% at December 31, 2017 | London Interbank Offered Rate LIBOR
Debt Instrument
Interest rate above variable interest rate (as a percent)	0.85%
Parent Company [Member] | Senior debt obligations | Floating rate debt due December 2023. This note, which bears interest at 0.76% above 3-month EURIBOR, had a rate of .76% at September 30, 2018 and 0.76% at December 31, 2017
Debt Instrument
Long-term debt	$ 24		$ 24
Long-term debt, weighted average interest rate (as a percent)	0.76%		0.76%
Parent Company [Member] | Senior debt obligations | Floating rate debt due December 2023. This note, which bears interest at 0.76% above 3-month EURIBOR, had a rate of .76% at September 30, 2018 and 0.76% at December 31, 2017 | London Interbank Offered Rate LIBOR
Debt Instrument
Interest rate above variable interest rate (as a percent)	0.76%
Parent Company [Member] | Subordinated Debt | Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 3.71% at September 30, 2018 and 3.07% at December 31, 2017
Debt Instrument
Long-term debt	$ 300		$ 300
Long-term debt, weighted average interest rate (as a percent)	3.71%		3.07%
Parent Company [Member] | Subordinated Debt | Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 3.71% at September 30, 2018 and 3.07% at December 31, 2017 | London Interbank Offered Rate LIBOR
Debt Instrument
Interest rate above variable interest rate (as a percent)	1.38%		1.38%
Parent Company [Member] | Junior subordinated debt payable to trusts | Floating rate note due September 2036. This note had an interest rate of 4.03% at September 30, 2018 and 3.29% at December 31, 2017
Debt Instrument
Long-term debt	$ 36		$ 36
Long-term debt, weighted average interest rate (as a percent)	4.03%		3.29%
MUFG Union Bank N.A
Debt Instrument
Long-term debt	$ 5,425		$ 3,810
MUFG Union Bank N.A | Senior debt obligations | Fixed rate 2.63% notes due September 2018
Debt Instrument
Long-term debt	$ 0		$ 1,000
Debt instrument, fixed interest rate (as a percent)	0.00%		2.63%
MUFG Union Bank N.A | Senior debt obligations | Fixed rate FHLB of San Francisco advances due between October 2018 and June 2020. These notes bear a combined weighted average rate of 2.12% at September 30, 2018 and 1.51% at December 31, 2017
Debt Instrument
Long-term debt	$ 4,900		$ 1,500
Debt instrument, fixed interest rate (as a percent)	2.12%		1.51%
MUFG Union Bank N.A | Senior debt obligations | Fixed rate 2.25% notes due May 2019
Debt Instrument
Long-term debt	$ 497		$ 497
Debt instrument, fixed interest rate (as a percent)	2.25%		2.25%
MUFG Union Bank N.A | Subordinated Debt | Floating rate subordinated debt due June 2023. This note, which bore interest at 1.20% above 3-month LIBOR, had a rate of 2.89% at December 31, 2017
Debt Instrument
Long-term debt	$ 0		$ 750
Long-term debt, weighted average interest rate (as a percent)			2.89%	0.00%
MUFG Union Bank N.A | Subordinated Debt | Floating rate subordinated debt due June 2023. This note, which bore interest at 1.20% above 3-month LIBOR, had a rate of 2.89% at December 31, 2017 | London Interbank Offered Rate LIBOR
Debt Instrument
Interest rate above variable interest rate (as a percent)	0.00%		1.20%
MUFG Union Bank N.A | Other
Debt Instrument
Long-term debt	$ 28		$ 63
Other Subsidiaries, Excluding MUFG Bank, NA
Debt Instrument
Long-term debt	1,073		1,355
Other Subsidiaries, Excluding MUFG Bank, NA | Senior debt obligations | Various floating rate borrowings due between December 2020 and May 2021. These notes, which bear interest above 3-month LIBOR had a weighted average interest rate of 2.39% at September 30, 2018 and 1.78% at December 31, 2017
Debt Instrument
Long-term debt	250		$ 291
Long-term debt, weighted average interest rate (as a percent)			1.78%	2.39%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior debt obligations | Various fixed rate borrowings due between February 2019 and May 2024 with a weighted average interest rate of 1.82% (between 0.14% and 2.44%) at September 30, 2018 and 2.12% (between 1.37% and 2.65%) at December 31, 2017
Debt Instrument
Long-term debt	264		$ 339
Long-term debt, weighted average interest rate (as a percent)			2.12%	1.82%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior debt obligations | Various fixed rate borrowings due between February 2019 and May 2024 with a weighted average interest rate of 1.82% (between 0.14% and 2.44%) at September 30, 2018 and 2.12% (between 1.37% and 2.65%) at December 31, 2017 | Minimum
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			1.37%	0.14%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior debt obligations | Various fixed rate borrowings due between February 2019 and May 2024 with a weighted average interest rate of 1.82% (between 0.14% and 2.44%) at September 30, 2018 and 2.12% (between 1.37% and 2.65%) at December 31, 2017 | Maximum
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			2.65%	2.44%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior debt obligations | Various floating rate borrowings due between September 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had an interest rate of 4.13% at September 30, 2018 and 2.95% (between 2.88% and 3.04%) at December 31, 2017
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			2.95%	4.13%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior debt obligations | Various floating rate borrowings due between September 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had an interest rate of 4.13% at September 30, 2018 and 2.95% (between 2.88% and 3.04%) at December 31, 2017 | Minimum
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			2.88%	0.00%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior debt obligations | Various floating rate borrowings due between September 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had an interest rate of 4.13% at September 30, 2018 and 2.95% (between 2.88% and 3.04%) at December 31, 2017 | Maximum
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			3.04%	0.00%
Other Subsidiaries, Excluding MUFG Bank, NA | Subordinated Debt | Various floating rate borrowings due between September 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had an interest rate of 4.13% at September 30, 2018 and 2.95% (between 2.88% and 3.04%) at December 31, 2017
Debt Instrument
Long-term debt	75		$ 185
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate non-recourse borrowings due between November 2018 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.83% (between 3.49% and 4.48%) at September 30, 2018 and 3.07% (between 1.49% and 5.58%) at December 31, 2017
Debt Instrument
Long-term debt	77		$ 79
Long-term debt, weighted average interest rate (as a percent)			3.07%	3.83%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate non-recourse borrowings due between November 2018 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.83% (between 3.49% and 4.48%) at September 30, 2018 and 3.07% (between 1.49% and 5.58%) at December 31, 2017 | Minimum
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			1.49%	3.49%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate non-recourse borrowings due between November 2018 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.83% (between 3.49% and 4.48%) at September 30, 2018 and 3.07% (between 1.49% and 5.58%) at December 31, 2017 | Maximum
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			5.58%	4.48%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Fixed rate non-recourse borrowings due between January 2019 and July 2023 which had an interest rate of 3.06% at September 30, 2018 and 3.27% at December 31, 2017
Debt Instrument
Long-term debt	195		$ 240
Long-term debt, weighted average interest rate (as a percent)			3.27%	3.06%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate non-recourse borrowings due between February 2019 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.64% (between 3.34% and 4.23%) at September 30, 2018 and 2.88% (between 2.50% and 3.54%) at December 31, 2017
Debt Instrument
Long-term debt	178		$ 185
Long-term debt, weighted average interest rate (as a percent)			2.88%	3.64%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate non-recourse borrowings due between February 2019 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.64% (between 3.34% and 4.23%) at September 30, 2018 and 2.88% (between 2.50% and 3.54%) at December 31, 2017 | Minimum
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			2.50%	3.34%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate non-recourse borrowings due between February 2019 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.64% (between 3.34% and 4.23%) at September 30, 2018 and 2.88% (between 2.50% and 3.54%) at December 31, 2017 | Maximum
Debt Instrument
Long-term debt, weighted average interest rate (as a percent)			3.54%	4.20%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Fixed rate non-recourse borrowings due December 2026 which had an interest rate of 5.34% at September 30, 2018 and December 31, 2017
Debt Instrument
Long-term debt	$ 34		$ 36
Debt instrument, fixed interest rate (as a percent)			5.34%	5.34%

XML

Fair Value Measurement and Fair Value of Financial Instruments - Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions		Sep. 30, 2018		Dec. 31, 2017
Fair value measurements
Trading account assets(2):		$ 11,213		$ 10,567
Securities available for sale(3):		17,077
U.S. Treasury
Fair value measurements
Securities available for sale(3):		3,730
Other
Fair value measurements
Securities available for sale(3):		188
U.S. government agency and government-sponsored agencies
Fair value measurements
Securities available for sale(3):		8,501
Privately issued
Fair value measurements
Securities available for sale(3):		861
Collateralized loan obligations
Fair value measurements
Securities available for sale(3):		1,434
Other
Fair value measurements
Securities available for sale(3):		4
Direct bank purchase bonds
Fair value measurements
Securities available for sale(3):		1,281
Level 1
Fair value measurements
Securities available for sale(3):				0
Other assets:		18		0
Other liabilities:				0
Level 1 | U.S. Treasury
Fair value measurements
Trading account assets(2):				0
Securities available for sale(3):				0
Trading account liabilities(2):				0
Level 1 | U.S. government-sponsored agency securities
Fair value measurements
Trading account assets(2):				0
Level 1 | State and municipal
Fair value measurements
Trading account assets(2):				0
Level 1 | Commercial paper
Fair value measurements
Trading account assets(2):				0
Level 1 | Other
Fair value measurements
Trading account assets(2):				0
Securities available for sale(3):				0
Trading account liabilities(2):				0
Level 1 | Corporate bonds
Fair value measurements
Trading account assets(2):				0
Level 1 | Asset-backed securities
Fair value measurements
Trading account assets(2):				0
Level 1 | Mortgage-backed securities
Fair value measurements
Trading account assets(2):				0
Level 1 | Commodity derivative contracts
Fair value measurements
Trading account assets(2):				0
Trading account liabilities(2):				0
Level 1 | Equity derivative contracts
Fair value measurements
Trading account liabilities(2):				7
Level 1 | U.S. government agency and government-sponsored agencies
Fair value measurements
Securities available for sale(3):				0
Level 1 | Privately issued
Fair value measurements
Securities available for sale(3):				0
Level 1 | Privately issued commercial mortgage-backed securities
Fair value measurements
Securities available for sale(3):				0
Level 1 | Collateralized loan obligations
Fair value measurements
Securities available for sale(3):				0
Level 1 | Other
Fair value measurements
Securities available for sale(3):				0
Level 1 | Mortgage servicing rights
Fair value measurements
Other assets:				0
Level 1 | Interest rate hedging contracts
Fair value measurements
Other assets:				0
Level 1 | Corporate bonds
Fair value measurements
Trading account liabilities(2):				0
Level 1 | Other derivative contracts
Fair value measurements
Other assets:				0
Other liabilities:				0
Level 2
Fair value measurements
Securities available for sale(3):				0
Other assets:		0
Trading account liabilities(2):				0
Level 2 | Equity securities
Fair value measurements
Trading account assets(2):				0
Securities available for sale(3):				0
Level 2 | Equity derivative contracts
Fair value measurements
Trading account assets(2):				0
Trading account liabilities(2):				0
Level 2 | Mortgage servicing rights
Fair value measurements
Other assets:				0
Level 3
Fair value measurements
Other assets:		0
Trading account liabilities(2):				0
Other liabilities:				0
Level 3 | U.S. Treasury
Fair value measurements
Trading account assets(2):				0
Securities available for sale(3):				0
Trading account liabilities(2):				0
Level 3 | U.S. government-sponsored agency securities
Fair value measurements
Trading account assets(2):				0
Level 3 | State and municipal
Fair value measurements
Trading account assets(2):				0
Level 3 | Commercial paper
Fair value measurements
Trading account assets(2):				0
Level 3 | Other
Fair value measurements
Trading account assets(2):				0
Trading account liabilities(2):				0
Level 3 | Corporate bonds
Fair value measurements
Trading account assets(2):				0
Level 3 | Asset-backed securities
Fair value measurements
Trading account assets(2):				0
Level 3 | Mortgage-backed securities
Fair value measurements
Trading account assets(2):				0
Level 3 | Equity securities
Fair value measurements
Trading account assets(2):				0
Securities available for sale(3):				0
Level 3 | U.S. government agency and government-sponsored agencies
Fair value measurements
Securities available for sale(3):				0
Level 3 | Privately issued
Fair value measurements
Securities available for sale(3):				0
Level 3 | Privately issued commercial mortgage-backed securities
Fair value measurements
Securities available for sale(3):				0
Level 3 | Collateralized loan obligations
Fair value measurements
Securities available for sale(3):				0
Level 3 | Other
Fair value measurements
Securities available for sale(3):				0
Level 3 | Interest rate hedging contracts
Fair value measurements
Other assets:				0
Level 3 | Corporate bonds
Fair value measurements
Trading account liabilities(2):				0
Fair Value
Fair value measurements
Other assets:		18
Fair Value, Measurements, Recurring
Fair value measurements
Netting Adjustment		$ (306)	[1]	$ (607)	[2]
Percentage of total		100.00%		100.00%
Netting Adjustment		1.00%		2.00%
Percentage of total Company assets		18.00%		18.00%
Netting Adjustment		(0.00%)		(0.00%)
Netting Adjustment		$ (309)	[1]	$ (620)	[2]
Percentage of total		100.00%		100.00%
Netting Adjustment		7.00%		17.00%
Percentage of total Company liabilities		3.00%		3.00%
Netting Adjustment		(0.00%)		(0.00%)
Fair Value, Measurements, Recurring | Interest rate derivative contracts
Fair value measurements
Netting Adjustment		$ (121)		$ (353)
Netting Adjustment		(217)		(382)
Fair Value, Measurements, Recurring | Commodity derivative contracts
Fair value measurements
Netting Adjustment		(28)		(49)
Netting Adjustment		(24)		(20)
Fair Value, Measurements, Recurring | Foreign exchange derivative contracts
Fair value measurements
Netting Adjustment		(117)		(68)
Netting Adjustment		(49)		(66)
Fair Value, Measurements, Recurring | Equity derivative contracts
Fair value measurements
Netting Adjustment		(40)		(135)
Netting Adjustment		0
Fair Value, Measurements, Recurring | Trading securities
Fair value measurements
Netting Adjustment		(306)	[1]	(605)	[2]
Netting Adjustment		(290)	[1]	(468)	[2]
Fair Value, Measurements, Recurring | Other
Fair value measurements
Netting Adjustment	[2]	0		(2)
Fair Value, Measurements, Recurring | Interest rate hedging contracts
Fair value measurements
Netting Adjustment		0		0
Netting Adjustment				(149)
Fair Value, Measurements, Recurring | Other derivative contracts
Fair value measurements
Netting Adjustment		0		(2)
Netting Adjustment		(19)		(3)
Fair Value, Measurements, Recurring | Equity securities
Fair value measurements
Netting Adjustment		0
Fair Value, Measurements, Recurring | Total other liabilities
Fair value measurements
Netting Adjustment		(19)	[1]	(152)	[2]
Fair Value, Measurements, Recurring | Level 1
Fair value measurements
Trading account assets(2):				202
Securities available for sale(3):		0		10
Other assets:		9
Total assets		$ 165		$ 212
Percentage of total		0.00%		1.00%
Percentage of total Company assets		0.00%		0.00%
Trading account liabilities(2):		$ 96		$ 46
Fdic Clawback				0
Other liabilities:		0
Total liabilities		$ 96		$ 46
Percentage of total		2.00%		1.00%
Percentage of total Company liabilities		0.00%		0.00%
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury
Fair value measurements
Trading account assets(2):		$ 0
Securities available for sale(3):		0
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 1 | U.S. government-sponsored agency securities
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 1 | State and municipal
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper
Fair value measurements
Trading account assets(2):		0
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 1 | Other
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 1 | Equity securities
Fair value measurements
Trading account assets(2):		122		$ 193
Securities available for sale(3):				10
Trading account liabilities(2):		88		35
Fair Value, Measurements, Recurring | Level 1 | Interest rate derivative contracts
Fair value measurements
Trading account assets(2):		32		7
Trading account liabilities(2):		3		3
Fair Value, Measurements, Recurring | Level 1 | Commodity derivative contracts
Fair value measurements
Trading account assets(2):		0
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange derivative contracts
Fair value measurements
Trading account assets(2):		1		0
Trading account liabilities(2):		1		1
Fair Value, Measurements, Recurring | Level 1 | Equity derivative contracts
Fair value measurements
Trading account assets(2):		1		2
Trading account liabilities(2):		4
Fair Value, Measurements, Recurring | Level 1 | Trading securities
Fair value measurements
Trading account assets(2):		156
Fair Value, Measurements, Recurring | Level 1 | Fdic [Member]
Fair value measurements
Other liabilities:		0
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency and government-sponsored agencies
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 1 | Privately issued
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 1 | Privately issued commercial mortgage-backed securities
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 1 | Collateralized loan obligations
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 1 | Other
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 1 | Direct bank purchase bonds
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 1 | Mortgage servicing rights
Fair value measurements
Other assets:		0
Fair Value, Measurements, Recurring | Level 1 | Interest rate hedging contracts
Fair value measurements
Other assets:		0
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds
Fair value measurements
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 1 | Other derivative contracts
Fair value measurements
Other assets:		0
Other liabilities:		0
Fair Value, Measurements, Recurring | Level 1 | Equity securities
Fair value measurements
Other assets:		9
Fair Value, Measurements, Recurring | Level 2
Fair value measurements
Trading account assets(2):				10,831
Securities available for sale(3):		15,652		15,954
Other assets:		5		4
Total assets		$ 26,977		$ 26,789
Percentage of total		95.00%		95.00%
Percentage of total Company assets		17.00%		17.00%
Trading account liabilities(2):		$ 4,180		$ 3,884
Fdic Clawback				0
Other liabilities:		21		152
Total liabilities		$ 4,201		$ 4,036
Percentage of total		101.00%		109.00%
Percentage of total Company liabilities		3.00%		3.00%
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury
Fair value measurements
Trading account assets(2):		$ 2,968		$ 1,926
Securities available for sale(3):		3,730		3,252
Trading account liabilities(2):		2,518		2,709
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored agency securities
Fair value measurements
Trading account assets(2):		115		118
Fair Value, Measurements, Recurring | Level 2 | State and municipal
Fair value measurements
Trading account assets(2):		11		11
Fair Value, Measurements, Recurring | Level 2 | Commercial paper
Fair value measurements
Trading account assets(2):		335		7
Trading account liabilities(2):		22
Fair Value, Measurements, Recurring | Level 2 | Other
Fair value measurements
Trading account assets(2):				8
Securities available for sale(3):		44		68
Trading account liabilities(2):				7
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds
Fair value measurements
Trading account assets(2):		1,428		1,054
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
Fair value measurements
Trading account assets(2):		262		199
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities
Fair value measurements
Trading account assets(2):		5,511		6,339
Fair Value, Measurements, Recurring | Level 2 | Equity securities
Fair value measurements
Trading account assets(2):		0
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 2 | Interest rate derivative contracts
Fair value measurements
Trading account assets(2):		422		870
Trading account liabilities(2):		627		643
Fair Value, Measurements, Recurring | Level 2 | Commodity derivative contracts
Fair value measurements
Trading account assets(2):		42		50
Trading account liabilities(2):		33		33
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative contracts
Fair value measurements
Trading account assets(2):		226		249
Trading account liabilities(2):		127		144
Fair Value, Measurements, Recurring | Level 2 | Equity derivative contracts
Fair value measurements
Trading account assets(2):		0
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 2 | Trading securities
Fair value measurements
Trading account assets(2):		11,320
Fair Value, Measurements, Recurring | Level 2 | Fdic [Member]
Fair value measurements
Other liabilities:		0
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and government-sponsored agencies
Fair value measurements
Securities available for sale(3):		8,501		9,208
Fair Value, Measurements, Recurring | Level 2 | Privately issued
Fair value measurements
Securities available for sale(3):		861		694
Fair Value, Measurements, Recurring | Level 2 | Privately issued commercial mortgage-backed securities
Fair value measurements
Securities available for sale(3):		1,078		822
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations
Fair value measurements
Securities available for sale(3):		1,434		1,905
Fair Value, Measurements, Recurring | Level 2 | Other
Fair value measurements
Securities available for sale(3):		4		5
Fair Value, Measurements, Recurring | Level 2 | Direct bank purchase bonds
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 2 | Mortgage servicing rights
Fair value measurements
Other assets:		0
Fair Value, Measurements, Recurring | Level 2 | Interest rate hedging contracts
Fair value measurements
Other assets:		4		2
Other liabilities:				149
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds
Fair value measurements
Trading account liabilities(2):		853		348
Fair Value, Measurements, Recurring | Level 2 | Other derivative contracts
Fair value measurements
Other assets:		1		2
Other liabilities:		21		3
Fair Value, Measurements, Recurring | Level 2 | Equity securities
Fair value measurements
Other assets:		0
Fair Value, Measurements, Recurring | Level 3
Fair value measurements
Trading account assets(2):				139
Securities available for sale(3):		1,425		1,599
Other assets:		176		65
Total assets		$ 1,644		$ 1,803
Percentage of total		6.00%		6.00%
Percentage of total Company assets		1.00%		1.00%
Trading account liabilities(2):		$ 43		$ 138
Fdic Clawback				113
Other liabilities:		119		119
Total liabilities		$ 162		$ 257
Percentage of total		4.00%		7.00%
Percentage of total Company liabilities		0.00%		0.00%
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury
Fair value measurements
Trading account assets(2):		$ 0
Securities available for sale(3):		0
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 3 | U.S. government-sponsored agency securities
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 3 | State and municipal
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper
Fair value measurements
Trading account assets(2):		0
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 3 | Other
Fair value measurements
Securities available for sale(3):		144		$ 96
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities
Fair value measurements
Trading account assets(2):		0
Fair Value, Measurements, Recurring | Level 3 | Equity securities
Fair value measurements
Trading account assets(2):		0
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 3 | Interest rate derivative contracts
Fair value measurements
Trading account assets(2):		0		1
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 3 | Commodity derivative contracts
Fair value measurements
Trading account assets(2):		0		0
Trading account liabilities(2):		0		0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange derivative contracts
Fair value measurements
Trading account assets(2):		0		1
Trading account liabilities(2):		0		1
Fair Value, Measurements, Recurring | Level 3 | Equity derivative contracts
Fair value measurements
Trading account assets(2):		43		137
Trading account liabilities(2):		43		137
Fair Value, Measurements, Recurring | Level 3 | Trading securities
Fair value measurements
Trading account assets(2):		43
Fair Value, Measurements, Recurring | Level 3 | Fdic [Member]
Fair value measurements
Other liabilities:		115
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency and government-sponsored agencies
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 3 | Privately issued
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 3 | Privately issued commercial mortgage-backed securities
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 3 | Collateralized loan obligations
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 3 | Other
Fair value measurements
Securities available for sale(3):		0
Fair Value, Measurements, Recurring | Level 3 | Direct bank purchase bonds
Fair value measurements
Securities available for sale(3):		1,281		1,503
Fair Value, Measurements, Recurring | Level 3 | Mortgage servicing rights
Fair value measurements
Other assets:		176		64
Fair Value, Measurements, Recurring | Level 3 | Interest rate hedging contracts
Fair value measurements
Other assets:		0
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds
Fair value measurements
Trading account liabilities(2):		0
Fair Value, Measurements, Recurring | Level 3 | Other derivative contracts
Fair value measurements
Other assets:		0		1
Other liabilities:		4		6
Fair Value, Measurements, Recurring | Level 3 | Equity securities
Fair value measurements
Other assets:		0
Fair Value, Measurements, Recurring | Fair Value
Fair value measurements
Trading account assets(2):				10,567
Securities available for sale(3):		17,077		17,563
Other assets:		190		67
Total assets		28,480		28,197
Trading account liabilities(2):		4,029		3,600
Fdic Clawback				113
Other liabilities:		121		119
Total liabilities		4,150		3,719
Fair Value, Measurements, Recurring | Fair Value | U.S. Treasury
Fair value measurements
Trading account assets(2):		2,968		1,926
Securities available for sale(3):		3,730		3,252
Trading account liabilities(2):		2,518		2,709
Fair Value, Measurements, Recurring | Fair Value | U.S. government-sponsored agency securities
Fair value measurements
Trading account assets(2):		115		118
Fair Value, Measurements, Recurring | Fair Value | State and municipal
Fair value measurements
Trading account assets(2):		11		11
Fair Value, Measurements, Recurring | Fair Value | Commercial paper
Fair value measurements
Trading account assets(2):		335		7
Trading account liabilities(2):		22
Fair Value, Measurements, Recurring | Fair Value | Other
Fair value measurements
Trading account assets(2):				8
Securities available for sale(3):		188		164
Trading account liabilities(2):				7
Fair Value, Measurements, Recurring | Fair Value | Corporate bonds
Fair value measurements
Trading account assets(2):		1,428		1,054
Fair Value, Measurements, Recurring | Fair Value | Asset-backed securities
Fair value measurements
Trading account assets(2):		262		199
Fair Value, Measurements, Recurring | Fair Value | Mortgage-backed securities
Fair value measurements
Trading account assets(2):		5,511		6,339
Fair Value, Measurements, Recurring | Fair Value | Equity securities
Fair value measurements
Trading account assets(2):		122		193
Securities available for sale(3):				10
Trading account liabilities(2):		88		35
Fair Value, Measurements, Recurring | Fair Value | Interest rate derivative contracts
Fair value measurements
Trading account assets(2):		333		525
Trading account liabilities(2):		413		264
Fair Value, Measurements, Recurring | Fair Value | Commodity derivative contracts
Fair value measurements
Trading account assets(2):		14		1
Trading account liabilities(2):		9		13
Fair Value, Measurements, Recurring | Fair Value | Foreign exchange derivative contracts
Fair value measurements
Trading account assets(2):		110		182
Trading account liabilities(2):		79		80
Fair Value, Measurements, Recurring | Fair Value | Equity derivative contracts
Fair value measurements
Trading account assets(2):		4		4
Trading account liabilities(2):		47		144
Fair Value, Measurements, Recurring | Fair Value | Trading securities
Fair value measurements
Trading account assets(2):		11,213
Fair Value, Measurements, Recurring | Fair Value | Fdic [Member]
Fair value measurements
Other liabilities:		115
Fair Value, Measurements, Recurring | Fair Value | U.S. government agency and government-sponsored agencies
Fair value measurements
Securities available for sale(3):		8,501		9,208
Fair Value, Measurements, Recurring | Fair Value | Privately issued
Fair value measurements
Securities available for sale(3):		861		694
Fair Value, Measurements, Recurring | Fair Value | Privately issued commercial mortgage-backed securities
Fair value measurements
Securities available for sale(3):		1,078		822
Fair Value, Measurements, Recurring | Fair Value | Collateralized loan obligations
Fair value measurements
Securities available for sale(3):		1,434		1,905
Fair Value, Measurements, Recurring | Fair Value | Other
Fair value measurements
Securities available for sale(3):		4		5
Fair Value, Measurements, Recurring | Fair Value | Direct bank purchase bonds
Fair value measurements
Securities available for sale(3):		1,281		1,503
Fair Value, Measurements, Recurring | Fair Value | Mortgage servicing rights
Fair value measurements
Other assets:		176		64
Fair Value, Measurements, Recurring | Fair Value | Interest rate hedging contracts
Fair value measurements
Other assets:		4		2
Other liabilities:				0
Fair Value, Measurements, Recurring | Fair Value | Corporate bonds
Fair value measurements
Trading account liabilities(2):		853		348
Fair Value, Measurements, Recurring | Fair Value | Other derivative contracts
Fair value measurements
Other assets:		1		1
Other liabilities:		6		$ 6
Fair Value, Measurements, Recurring | Fair Value | Equity securities
Fair value measurements
Other assets:		$ 9

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

[2] Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.

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Fair Value Measurement and Fair Value of Financial Instruments - Reconciliation of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Settlements		$ 0
Trading derivatives
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Asset (liability) balance, beginning of period	$ (49)	(169)	$ (138)	$ (166)
Included in income before taxes	7	17	1	57
Included in other comprehensive income	0	0	0	0
Purchases/additions	0	0	0	0
Settlements	13	24	96	61
Asset (liability) balance, end of period	(43)	(162)	(43)	(162)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	(7)	(17)	(1)	(57)
Other Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Asset (liability) balance, beginning of period	(119)	(118)	(119)	(121)
Included in income before taxes	0	1	0	(2)
Included in other comprehensive income	0	0	0	0
Purchases/additions	0	0	0	0
Settlements	0		0	0
Asset (liability) balance, end of period	(119)	(119)	(119)	(119)
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	0	(1)	0	2
Trading derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Asset (liability) balance, beginning of period	50	171	139	168
Included in income before taxes	6	17	0	58
Included in other comprehensive income	0	0	0	0
Purchases/additions	0	0	0	0
Settlements	(13)	(24)	(96)	(62)
Asset (liability) balance, end of period	43	164	43	164
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	6	17	0	58
Securities Available for Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Asset (liability) balance, beginning of period	1,495	1,572	1,600	1,638
Included in income before taxes	0	0	0	0
Included in other comprehensive income	(1)	3	(18)	15
Purchases/additions	52	4	125	6
Settlements	(121)	(10)	(282)	(90)
Asset (liability) balance, end of period	1,425	1,569	1,425	1,569
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	0	0	0	0
Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Asset (liability) balance, beginning of period	149	49	65	24
Included in income before taxes	2	(1)	11	(3)
Included in other comprehensive income	0	0	0	0
Purchases/additions	25	9	100	36
Settlements	0	0	0	0
Asset (liability) balance, end of period	176	57	176	57
Changes in unrealized gains (losses) included in income before taxes for assets and liabilities still held at end of period	$ 2	$ (1)	$ 11	$ (3)

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Fair Value Measurement and Fair Value of Financial Instruments - Significant Unobservable Inputs Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Unobservable Input(s) Level 3
Securities Available for Sale	$ 17,077	$ 17,563
Direct bank purchase bonds
Unobservable Input(s) Level 3
Securities Available for Sale	$ 1,281	$ 1,503
Direct bank purchase bonds | Weighted Average | Return on equity
Unobservable Input(s) Level 3
Market-required return on capital (as a percent)	9.50%
Probability of default (as a percent)	0.30%
Loss severity (as a percent)	24.30%
Direct bank purchase bonds | Level 3
Unobservable Input(s) Level 3
Securities Available for Sale	$ 1,281

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Fair Value Measurement and Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Loans:
Impaired loans	$ 786		$ 786		$ 865
Loss Impaired loans	59	$ 21	73	$ 42
Other assets:
Computer software, impairments	1	1	3	4
Gain (loss) on loans held for sale		1		3
Gain (loss) on private equity investments	0		2
Gain (loss) on equity method investment		0		(2)
Impairment of Consolidated Variable Interest Entity Low Income Housing Credit Investments	0	(3)	(8)	(11)
Loss, Total	(60)	(26)	(88)	(58)
Gain (Loss) on Energy Investments	0		(2)
Fair Value Measurements, Nonrecurring
Loans:
Impaired loans	183	97	183	97
Other assets:
Software	0	0	0	0
Variable Interest Entity, Consolidated, Carrying Amount, Assets	48	81	48	81
Loans held for sale		7		7
Private equity investments	10		10
Renewable energy investment		0		0
Total	243	185	243	185
Renewable Energy Investment	2		2
Fair Value Measurements, Nonrecurring | Level 1
Loans:
Impaired loans	0	0	0	0
Other assets:
Software	0	0	0	0
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0	0
Loans held for sale		0		0
Private equity investments	0		0
Renewable energy investment		0		0
Total	0	0	0	0
Renewable Energy Investment	0		0
Fair Value Measurements, Nonrecurring | Level 2
Loans:
Impaired loans	0	0	0	0
Other assets:
Software	0	0	0	0
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0	0	0	0
Loans held for sale		0		0
Private equity investments	0		0
Renewable energy investment		0		0
Total	0	0	0	0
Renewable Energy Investment	0		0
Fair Value Measurements, Nonrecurring | Level 3
Loans:
Impaired loans	183	97	183	97
Other assets:
Software	0	0	0	0
Variable Interest Entity, Consolidated, Carrying Amount, Assets	48	81	48	81
Loans held for sale		7		7
Private equity investments	10		10
Renewable energy investment		0		0
Total	243	$ 185	243	$ 185
Renewable Energy Investment	$ 2		$ 2

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Fair Value Measurement and Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Assets
Securities borrowed or purchased under resale agreements		$ 21,265	$ 20,894
Securities held to maturity		10,972	9,799
Level 1
Assets
Cash and cash equivalents		4,192	3,392
Securities borrowed or purchased under resale agreements		0	0
Securities held to maturity		0	0
Loans held for investment, net of allowance for loan losses		0	0
Other assets:		18	0
Liabilities
Time deposits		0	0
Commercial paper and other short-term borrowings		0	0
Securities loaned or sold under repurchase agreements		0	0
Long-term debt		0	0
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit		0	0
Level 2
Assets
Cash and cash equivalents		0	0
Securities borrowed or purchased under resale agreements		21,262	20,894
Securities held to maturity		10,972	9,799
Loans held for investment, net of allowance for loan losses		0	0
Other assets:		0
Liabilities
Time deposits		9,899	84,743
Commercial paper and other short-term borrowings		8,309	7,066
Securities loaned or sold under repurchase agreements		27,030	26,437
Long-term debt		12,764	12,162
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit		0	0
Level 3
Assets
Cash and cash equivalents		0	0
Securities borrowed or purchased under resale agreements		0	0
Securities held to maturity		0	0
Loans held for investment, net of allowance for loan losses		81,445	79,051
Other assets:		0
Liabilities
Time deposits		0	0
Commercial paper and other short-term borrowings		0	0
Securities loaned or sold under repurchase agreements		0	0
Long-term debt		0	0
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit		230	174
Carrying Amount
Assets
Cash and cash equivalents		4,192	3,392
Securities borrowed or purchased under resale agreements		21,265	20,894
Securities held to maturity		11,320	9,885
Loans held for investment, net of allowance for loan losses		81,765	78,023
Other assets:		18
Liabilities
Time deposits		9,957	84,787
Commercial paper and other short-term borrowings		8,309	7,066
Securities loaned or sold under repurchase agreements		27,032	26,437
Long-term debt		12,796	12,162
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit		102	174
Fair Value
Assets
Cash and cash equivalents		4,192	3,392
Securities borrowed or purchased under resale agreements		21,262	20,894
Securities held to maturity		10,972	9,799
Loans held for investment, net of allowance for loan losses	[1]	81,445	79,051
Other assets:		18
Liabilities
Time deposits		9,899	84,743
Commercial paper and other short-term borrowings		8,309	7,066
Securities loaned or sold under repurchase agreements		27,030	26,437
Long-term debt		12,764	12,162
Off-Balance Sheet Instruments
Commitments to extend credit and standby and commercial letters of credit		$ 230	$ 174

[1] Excludes lease financing. The carrying amount is net of the allowance for loan losses.

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Derivative Instruments and Other Financial Instruments Used For Hedging - Notional Amounts and Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative Instruments and Other Financial Instruments
Notional Amount	$ 131,118		$ 131,118		$ 150,854
Assets Derivatives	772		772		1,322
Liability Derivatives	863		863		1,127
Interest rate derivative contracts | Not designated as hedging instruments
Derivative Instruments and Other Financial Instruments
Notional Amount	120,613		120,613		132,214
Assets Derivatives	454		454		878
Liability Derivatives	630		630		646
Interest rate derivative contracts | Cash Flow Hedges | Designated as Hedging Instrument
Derivative Instruments and Other Financial Instruments
Notional Amount	179		179		6,998
Assets Derivatives	4		4		2
Liability Derivatives	0		0		149
Interest rate derivative contracts | Fair value hedges | Designated as Hedging Instrument
Derivative Instruments and Other Financial Instruments
Notional Amount	0		0		500
Assets Derivatives	0		0		0
Liability Derivatives	0		0		0
Commodity derivative contracts | Not designated as hedging instruments
Derivative Instruments and Other Financial Instruments
Notional Amount	453		453		1,244
Assets Derivatives	42		42		50
Liability Derivatives	33		33		33
Foreign exchange derivative contracts | Not designated as hedging instruments
Derivative Instruments and Other Financial Instruments
Notional Amount	8,099		8,099		7,053
Assets Derivatives	227		227		250
Liability Derivatives	128		128		146
Equity derivative contracts | Not designated as hedging instruments
Derivative Instruments and Other Financial Instruments
Notional Amount	503		503		1,496
Assets Derivatives	44		44		139
Liability Derivatives	47		47		144
Other derivative contracts | Not designated as hedging instruments
Derivative Instruments and Other Financial Instruments
Notional Amount	39		39		4
Assets Derivatives	0		0		0
Liability Derivatives	0		0		0
Trading derivatives | Not designated as hedging instruments
Derivative Instruments and Other Financial Instruments
Notional Amount	129,707		129,707		142,011
Assets Derivatives	767		767		1,317
Liability Derivatives	838		838		969
Other Risk Management | Not designated as hedging instruments
Derivative Instruments and Other Financial Instruments
Notional Amount	1,232		1,232		1,345
Assets Derivatives	1		1		3
Liability Derivatives	25		25		$ 9
Net gains (losses) on derivatives included in other noninterest income	$ 28	$ 3	$ (26)	$ 9

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Derivative Instruments and Other Financial Instruments Used For Hedging - Amount and Location of Gains and Losses for Derivatives Designated as Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Cash flow hedges
Notional Amount	$ 131,118		$ 131,118		$ 150,854
Income from accumulated other comprehensive income expected to be reclassified to net interest income			$ 81
Unrealized net gains (losses) on hedges arising during the period, before tax		$ 6
Cash Flow Hedges
Cash flow hedges
Derivative, Average Remaining Maturity			1 year 10 months 24 days
Interest rate contracts, Amount of Gain or (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)	0	6	$ (98)	$ 42
Interest rate contracts, Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(11)	11	(19)	60
Cash Flow Hedges | Noninterest expense
Cash flow hedges
Interest rate contracts, (Gain) Loss Recognized in Income on Derivative Instruments (Ineffective Portion)	0	0	(1)	3
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate derivative contracts
Cash flow hedges
Notional Amount	179		179		$ 6,998
Interest rate contracts, Amount of Gain or (Loss) Recognized in OCI on Derivative Instruments (Effective Portion)	0	6		42
Unrealized net gains (losses) on hedges arising during the period, before tax			(98)
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate derivative contracts | Interest income
Cash flow hedges
Interest rate contracts, Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(11)	11	(19)	60
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate derivative contracts | Interest expense
Cash flow hedges
Interest rate contracts, Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	0	0	0
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate derivative contracts | Noninterest expense
Cash flow hedges
Interest rate contracts, (Gain) Loss Recognized in Income on Derivative Instruments (Ineffective Portion)	0	$ 0	(1)	$ 3
Cash Flow Hedges | Designated as Hedging Instrument | Libor Indexed Short Term Borrowings | Interest rate swap contracts
Cash flow hedges
Notional Amount	$ 179		$ 179

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Derivative Instruments and Other Financial Instruments Used For Hedging - Schedule of Derivative Gains (Losses) on the Company's Fair Value Hedges (Details) - Fair value hedges - Interest rate derivative contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Amount and location of net gains and losses
Derivative	$ 0	$ (1)	$ (2)	$ (2)
Hedged Item	0	1	2	1
Hedge Ineffectiveness	0	0	0	(1)
Designated as Hedging Instrument
Amount and location of net gains and losses
Derivative	0	(1)	(2)	(2)
Hedged Item	0	1	2	1
Hedge Ineffectiveness	$ 0	$ 0	$ 0	$ (1)

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Derivative Instruments and Other Financial Instruments Used For Hedging - Gain or (Loss) Recognized in Income on Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Trading Derivatives
Trading account activities	$ (5)	$ (3)
Trading derivatives
Trading Derivatives
Trading account activities	80	0	$ 249	$ (36)
Trading derivatives | Interest rate derivative contracts
Trading Derivatives
Trading account activities	64	(11)	194	(69)
Trading derivatives | Equity contracts
Trading Derivatives
Trading account activities	5	0	23	0
Trading derivatives | Foreign exchange derivative contracts
Trading Derivatives
Trading account activities	11	11	32	32
Trading derivatives | Commodity [Member]
Trading Derivatives
Trading account activities	$ 0	$ 0	$ 0	$ 1

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- Change in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Change in accumulated other comprehensive loss balances:
Other Comprehensive Income Amortization of Net Unrealized Losses on Held To Maturity Securities Tax	$ (2)		$ (2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0		2
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(19)		14
Unrealized net gains (losses) on hedges arising during the period, before tax			6
Unrealized net gains (losses) on hedges arising during the period, tax			(2)
Unrealized net gains (losses) on hedges arising during the period, net of tax			4		$ (72)	$ 26
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt, before tax	11		(11)
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt, tax	(3)		4
Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt, net of tax	8		(7)		14	(37)
Net change, before tax	11		(5)		(79)	(18)
Net change, tax	(3)		2		21	7
Net change, net of tax	8		(3)		(58)	(11)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	(70)		32
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax	(51)		18		(289)	77
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	1		6
Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net, net of tax	(1)		(4)		(3)	(9)
Other Comprehensive Income (Loss), Accretion of Fair Value Adjustment from Sale of Securities, Before Tax			(1)			(1)
Other Comprehensive Income (Loss), Accretion of Fair Value Adjustment from Sale of Securities,Tax			0			0
Other Comprehensive Income (Loss), Accretion of Fair Value Adjustment from Sale of Securities, Net of Tax			(1)			(1)
Other Comprehensive Income Amortization of Net Unrealized Losses on Held To Maturity Securities Before Tax	(8)		(6)
Amortization of net unrealized (gains) losses on held to maturity securities, net of tax	6		4		15	9
Net change, before tax	(63)		31		(376)	128
Net change, tax	17		(14)		99	(52)
Net change, net of tax	(46)		17		(277)	76
Foreign currency translation adjustment, before tax			7
Foreign currency translation adjustment, tax			(3)
Foreign currency translation adjustment, net of tax			4		(2)	7
Amortization of prior service credit, before tax	(10)		(12)
Amortization of prior service credit, tax	2		5
Amortization of prior service credit, net of tax	(8)	[1]	(7)	[1]	(23)	(22)
Recognized net actuarial (gain) loss, before tax	24		21
Recognized net actuarial (gain) loss, tax	(6)		(7)
Recognized net actuarial (gain) loss, net of tax	18	[1]	14	[1]	53	42
Net change, before tax	14		9		41	31
Net change, tax	(4)		(2)		(11)	(11)
Net change, net of tax	10		7		30	20
Other, before tax			1		(1)	1
Other, tax			0		0	0
Other, net of tax	0		1		(1)	1
Other Comprehensive Income (Loss), before Tax	(38)		43		(418)	154
Other Comprehensive Income (Loss), Tax	10		(17)		110	(61)
Other Comprehensive Income (Loss), Net of Tax	$ (28)		$ 26		(308)	93
Net Unrealized Gains (Losses) on Cash Flow Hedges
Change in accumulated other comprehensive loss balances:
Other Comprehensive Income (Loss), before Reclassifications, before Tax					(98)	42
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax					19	(60)
Reclassification from AOCI, Current Period, Tax					(5)	23
Other Comprehensive Income (Loss) before Reclassifications, Tax					26	(16)
Accumulated Net Investment Gain (Loss) Arising During the Period, Attributable to Parent [Member]
Change in accumulated other comprehensive loss balances:
Other Comprehensive Income (Loss), before Reclassifications, before Tax					(392)	129
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax					(4)	(15)
Reclassification from AOCI, Current Period, Tax					1	6
Other Comprehensive Income (Loss) before Reclassifications, Tax					103	(52)
Accumulated Net Investment Gain (Loss), Held to Maturity Securities, Attributable to Parent [Member]
Change in accumulated other comprehensive loss balances:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax					20	15
Reclassification from AOCI, Current Period, Tax					(5)	(6)
Foreign Currency Translation Adjustment
Change in accumulated other comprehensive loss balances:
Other Comprehensive Income (Loss), before Tax					(3)	12
Other Comprehensive Income (Loss), Tax					1	(5)
Other Comprehensive Income (Loss), Net of Tax					(2)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Change in accumulated other comprehensive loss balances:
Other Comprehensive Income (Loss), before Reclassifications, before Tax					(31)	(36)
Other Comprehensive Income (Loss) before Reclassifications, Tax					8	14
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Change in accumulated other comprehensive loss balances:
Other Comprehensive Income (Loss), before Reclassifications, before Tax					72	67
Other Comprehensive Income (Loss) before Reclassifications, Tax					$ (19)	$ (25)

[1] These amounts are included in the computation of net periodic pension cost. For additional information, see Note 11 "Employee Pension and Other Postretirement Benefits".(Dollars in millions) BeforeTaxAmount TaxEffect Net ofTaxFor the Three Months Ended September 30, 2017 Cash flow hedge activities: Unrealized net gains (losses) on hedges arising during the period $6 $(2) $4Reclassification adjustment for net (gains) losses on hedges included in interest income for loans and interest expense on long-term debt (11) 4 (7)Net change (5) 2 (3)Securities: Unrealized holding gains (losses) arising during the period on securities available for sale 32 (14) 18Reclassification adjustment for net (gains) losses on securities available for sale included in securities gains, net (6) 2 (4)Less: accretion of fair value adjustment on securities available for sale (1) — (1)Amortization of net unrealized (gains) losses on held to maturity securities 6 (2) 4Net change 31 (14) 17Foreign currency translation adjustment 7 (3) 4Pension and other benefits: Amortization of prior service credit(1) (12) 5 (7) Recognized net actuarial (gain) loss(1) 21 (7) 14Net change 9 (2) 7Other 1 — 1Net change in AOCI $43 $(17) $26

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- Change in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning			$ 18,355	$ 17,386
Other comprehensive income (loss) before reclassifications			(364)	110
Other Comprehensive Income (Loss), Net of Tax	$ (28)	$ 26	(308)	93
Amounts reclassified from AOCI			56	(17)
Balance, ending	18,822	18,579	18,822	18,579
Net Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning	(240)	(85)	(174)	(77)
Other comprehensive income (loss) before reclassifications	0	4	(72)	26
Amounts reclassified from AOCI	8	(7)	14	(37)
Transfer to additional paid-in capital			0
Balance, ending	(232)	(88)	(232)	(88)
Net Unrealized Gains (Losses) on Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning	(464)	(149)	(233)	(208)
Other comprehensive income (loss) before reclassifications	(51)	18	(289)	77
Amounts reclassified from AOCI	5	(1)	12	(1)
Transfer to additional paid-in capital			0
Balance, ending	(510)	(132)	(510)	(132)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning	0	(19)	(19)	(22)
Other comprehensive income (loss) before reclassifications	0	4		7
Other Comprehensive Income (Loss), Net of Tax			(2)
Amounts reclassified from AOCI	0	0	0	0
Transfer to additional paid-in capital			21
Balance, ending	0	(15)	0	(15)
Pension and Other Benefits Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning	(580)	(576)	(600)	(589)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI	10	7	30	20
Transfer to additional paid-in capital			0
Balance, ending	(570)	(569)	(570)	(569)
Accumulated Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning	(1)	0	0	0
Other comprehensive income (loss) before reclassifications	0	0	(1)	0
Amounts reclassified from AOCI	0	1	0	1
Transfer to additional paid-in capital			0
Balance, ending	(1)	1	(1)	1
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning	(1,285)	(829)	(1,026)	(896)
Other comprehensive income (loss) before reclassifications	(51)	26
Other Comprehensive Income (Loss), Net of Tax			(308)	93
Amounts reclassified from AOCI	23	0
Transfer to additional paid-in capital			21
Balance, ending	$ (1,313)	$ (803)	$ (1,313)	$ (803)

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Employee Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension Benefits
Components of net periodic benefit cost:
Service cost	$ 21	$ 18	$ 60	$ 53
Interest cost	25	25	75	75
Expected return on plan assets	(67)	(64)	(201)	(191)
Amortization of prior service credit	(7)	(7)	(20)	(20)
Recognized net actuarial loss	21	19	65	59
Total net periodic benefit (income) cost	(7)	(9)	(21)	(24)
Other Postretirement Benefits
Components of net periodic benefit cost:
Service cost	0	1	3	4
Interest cost	2	2	6	6
Expected return on plan assets	(6)	(5)	(16)	(14)
Amortization of prior service credit	(3)	(5)	(11)	(16)
Recognized net actuarial loss	2	2	4	6
Total net periodic benefit (income) cost	(5)	(5)	(14)	(14)
Superannuation Supplemental Executives Retirement Plan Defined Benefit and Executive Supplemental Defined Benefit Plan [Member]
Components of net periodic benefit cost:
Service cost			0	0
Interest cost			2	2
Expected return on plan assets			0	0
Amortization of prior service credit			0	0
Recognized net actuarial loss			3	2
Superannuation, SERP and ESBP
Components of net periodic benefit cost:
Service cost	0	0
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of prior service credit	0	0
Recognized net actuarial loss	1	0
Total net periodic benefit (income) cost	$ 2	$ 1	$ 5	$ 4

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Commitments, Contingencies and Guarantees - Schedule of Commitments, Contingencies and Guarantees (Details) $ in Millions	Sep. 30, 2018 USD ($)
Commitments to extend credit
Commitment, Contingencies and Guarantees disclosures
Commitments	$ 34,125
Issued standby and commercial letters of credit
Commitment, Contingencies and Guarantees disclosures
Commitments	4,858
Commitments to enter into forward-starting resale agreements
Commitment, Contingencies and Guarantees disclosures
Commitments	1,300
Other commitments
Commitment, Contingencies and Guarantees disclosures
Commitments	$ 493

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Commitments, Contingencies and Guarantees - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Financial guarantee | Interest rate swap contracts
Guarantee disclosures
Future exposure to loss	$ 35
Issued standby and commercial letters of credit
Guarantee disclosures
Maximum term	1 year
Carrying value	$ 3

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Business Segments (Details) $ in Billions	9 Months Ended
	Sep. 30, 2018 USD ($) branch business_line segment
Business segments
Reportable segments | segment	4
Regional Bank
Business segments
Major business lines | business_line	5
Consumer and Business Banking Division
Business segments
Number of full-service branches | branch	345
Commercial Banking | Regional Bank
Business segments
Commercial banking customer revenues | $	$ 1

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Business Segments - Summary of Results (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017		Dec. 31, 2017
Business segments
Net interest income (expense)	$ 832	[1]	$ 816	[1]	$ 2,482		$ 2,405
Noninterest income (expense)	626	[1]	515	[1]	1,604		1,492
Total revenue	1,458	[1]	1,331	[1]	4,086		3,897
Noninterest expense	1,059	[1]	982	[1]	3,226		2,945
(Reversal of) provision for credit losses	64	[1]	18	[1]	43		(34)
Income before income taxes and including noncontrolling interests	335	[1]	331	[1]	817		986
Income tax expense (benefit)	35	[1]	109	[1]	21		255
Net income including noncontrolling interests	300	[1]	222	[1]	796		731
Deduct: net loss from noncontrolling interests	6	[1]	10	[1]	20		25
Net Income Attributable to MUAH	306	[1]	232	[1]	816		756
Total assets, end of period	161,036	[1]	154,852	[1]	161,036	[1]	154,852	[1]	$ 154,550
Operating segments | Regional Bank
Business segments
Net interest income (expense)	553		516		1,620		1,527
Noninterest income (expense)	111		108		338		326
Total revenue	664	[1]	624	[1]	1,958		1,853
Noninterest expense	518		487		1,552		1,483
(Reversal of) provision for credit losses	45		19		52		39
Income before income taxes and including noncontrolling interests	101	[1]	118	[1]	354		331
Income tax expense (benefit)	17		31		68		87
Net income including noncontrolling interests	84	[1]	87	[1]	286		244
Deduct: net loss from noncontrolling interests	0		0		0		0
Net Income Attributable to MUAH	84	[1]	87	[1]	286		244
Total assets, end of period	71,501		66,025		71,501		66,025
Operating segments | U.S. Wholesale & Investment Banking
Business segments
Net interest income (expense)	104		107		307		333
Noninterest income (expense)	103		91		283		296
Total revenue	207	[1]	198	[1]	590		629
Noninterest expense	106		98		310		298
(Reversal of) provision for credit losses	27		(9)		3		(51)
Income before income taxes and including noncontrolling interests	74	[1]	109	[1]	277		382
Income tax expense (benefit)	(3)		19		133		89
Net income including noncontrolling interests	77	[1]	90	[1]	144		293
Deduct: net loss from noncontrolling interests	0		0		0		0
Net Income Attributable to MUAH	77	[1]	90	[1]	144		293
Total assets, end of period	19,467		20,813		19,467		20,813
Operating segments | Transaction Banking
Business segments
Net interest income (expense)	66		64		197		179
Noninterest income (expense)	15		19		44		48
Total revenue	81	[1]	83	[1]	241		227
Noninterest expense	65		56		186		171
(Reversal of) provision for credit losses	(3)		(1)		(4)		(1)
Income before income taxes and including noncontrolling interests	19	[1]	28	[1]	59		57
Income tax expense (benefit)	5		11		16		23
Net income including noncontrolling interests	14	[1]	17	[1]	43		34
Deduct: net loss from noncontrolling interests	0		0		0		0
Net Income Attributable to MUAH	14	[1]	17	[1]	43		34
Total assets, end of period	882		1,042		882		1,042
Operating segments | MUSA
Business segments
Net interest income (expense)	52		62		157		178
Noninterest income (expense)	94		100		259		272
Total revenue	146	[1]	162	[1]	416		450
Noninterest expense	121		119		353		336
(Reversal of) provision for credit losses	0		0		0		0
Income before income taxes and including noncontrolling interests	25	[1]	43	[1]	63		114
Income tax expense (benefit)	6		18		15		45
Net income including noncontrolling interests	19	[1]	25	[1]	48		69
Deduct: net loss from noncontrolling interests	0		0		0		0
Net Income Attributable to MUAH	19	[1]	25	[1]	48		69
Total assets, end of period	33,366		32,538		33,366		32,538
Segment Reconciling Items
Business segments
Net interest income (expense)	57		67		201		188
Noninterest income (expense)	303		197		680		550
Total revenue	360	[1]	264	[1]	881		738
Noninterest expense	249		222		825		657
(Reversal of) provision for credit losses	(5)		9		(8)		(21)
Income before income taxes and including noncontrolling interests	116	[1]	33	[1]	64		102
Income tax expense (benefit)	10		30		(211)		11
Net income including noncontrolling interests	106	[1]	3	[1]	275		91
Deduct: net loss from noncontrolling interests	6		10		20		25
Net Income Attributable to MUAH	112	[1]	13	[1]	295		116
Total assets, end of period	$ 35,820		$ 34,434		$ 35,820		$ 34,434

[1] As of and for the Three Months Ended September 30, 2018:(Dollars in millions) Regional Bank U.S. Wholesale & Investment Banking Transaction Banking MUSA Other MUFG Americas Holdings CorporationResults of operations Net interest income $553 $104 $66 $52 $57 $832Noninterest income 111 103 15 94 303 626Total revenue 664 207 81 146 360 1,458Noninterest expense 518 106 65 121 249 1,059(Reversal of) provision for credit losses 45 27 (3) — (5) 64Income (loss) before income taxes and including noncontrolling interests 101 741925 116335Income tax expense (benefit) (1) 17 (3) 5 6 10 35Net income (loss) including noncontrolling interests 84 77 14 19 106 300Deduct: net (income) loss from noncontrolling interests — — — — 6 6Net income (loss) attributable to MUAH $84 $77 $14 $19 $112 $306 Total assets, end of period $71,501 $19,467 $882 $33,366 $35,820 $161,036

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Label	Element	Value
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 39,000,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 18,000,000