Mitsubishi UFJ Financial (MUFG) 6-K 17 Jan 18 2017 H1 Current report (foreign) Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Sep. 30, 2017
Document And Entity Information [Abstract]
Document Type	6-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	H1
Trading Symbol	MTU
Entity Registrant Name	MITSUBISHI UFJ FINANCIAL GROUP INC
Entity Central Index Key	67,088
Current Fiscal Year End Date	--03-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
ASSETS
Cash and due from banks		¥ 30,987,492	¥ 25,682,741
Interest-earning deposits in other banks		39,128,016	38,327,029
Call loans, funds sold, and receivables under resale agreements		7,457,475	8,892,383
Receivables under securities borrowing transactions		9,838,929	11,002,724
Trading account assets (including assets pledged that secured parties are permitted to sell or repledge of ¥6,175,242 and ¥7,019,727 at March 31, 2017 and September 30, 2017) (including ¥14,957,135 and ¥17,267,604 at March 31, 2017 and September 30, 2017 measured at fair value under fair value option)		41,390,111	41,320,049
Investment securities:
Available-for-sale securities-carried at fair value (including assets pledged that secured parties are permitted to sell or repledge of ¥11,133,433 and ¥7,390,850 at March 31, 2017 and September 30, 2017)		36,827,530	39,090,099
Held-to-maturity securities-carried at amortized cost (including assets pledged that secured parties are permitted to sell or repledge of ¥446,146 and ¥687,931 at March 31, 2017 and September 30, 2017) (fair value of ¥3,637,751 and ¥3,277,809 at March 31, 2017 and September 30, 2017)		3,230,851	3,587,321
Other investment securities		555,250	556,161
Total investment securities		40,613,631	43,233,581
Loans, net of unearned income, unamortized premiums and deferred loan fees (including assets pledged that secured parties are permitted to sell or repledge of ¥1,010,730 and ¥947,100 at March 31, 2017 and September 30, 2017)	[1]	118,235,423	118,214,972
Allowance for credit losses		(916,181)	(1,182,188)
Net loans		117,319,242	117,032,784
Premises and equipment-net		1,010,133	994,271
Accrued interest		307,674	281,752
Customers' acceptance liability		140,778	156,208
Intangible assets-net		999,755	1,020,359
Goodwill		435,553	450,143
Deferred tax assets		56,738	76,452
Other assets		10,715,453	8,714,543
Total assets		300,400,980	297,185,019
LIABILITIES AND EQUITY
Deposits: Domestic offices, Non-interest-bearing		22,937,903	23,098,886
Deposits: Domestic offices, Interest-bearing		122,210,795	121,741,545
Deposits: Overseas offices, principally interest-bearing		46,636,077	45,561,192
Total deposits		191,784,775	190,401,623
Call money, funds purchased, and payables under repurchase agreements		19,647,904	18,056,476
Payables under securities lending transactions		4,789,971	5,549,004
Due to trust account and other short-term borrowings (including ¥112,424 and ¥224,779 at March 31, 2017 and September 30, 2017 measured at fair value under fair value option)		11,349,001	11,304,676
Trading account liabilities		16,418,784	18,790,133
Obligations to return securities received as collateral		2,699,912	3,516,232
Bank acceptances outstanding		140,778	156,208
Accrued interest		162,018	147,351
Long-term debt (including ¥377,423 and ¥348,196 at March 31, 2017 and September 30, 2017 measured at fair value under fair value option)		30,133,040	27,743,443
Other liabilities		7,794,424	6,755,165
Total liabilities		284,920,607	282,420,311
Commitments and contingent liabilities
Mitsubishi UFJ Financial Group shareholders' equity:
Capital stock-common stock authorized, 33,000,000,000 shares; common stock issued, 14,168,853,820 shares and 14,027,694,920 shares at March 31, 2017 and September 30, 2017, with no stated value		2,090,270	2,090,270
Capital surplus		5,820,198	5,956,644
Retained earnings:
Appropriated for legal reserve		239,571	239,571
Unappropriated retained earnings		4,601,402	3,931,612
Accumulated other comprehensive income, net of taxes		2,514,742	2,281,423
Treasury stock, at cost-739,564,216 common shares and 737,911,321 common shares at March 31, 2017 and September 30, 2017		(513,999)	(513,988)
Total Mitsubishi UFJ Financial Group shareholders' equity		14,752,184	13,985,532
Noncontrolling interests		728,189	779,176
Total equity		15,480,373	14,764,708
Total liabilities and equity		300,400,980	297,185,019
Consolidated VIEs [Member]
ASSETS
Cash and due from banks		191	186
Interest-earning deposits in other banks		17,227	12,048
Trading account assets (including assets pledged that secured parties are permitted to sell or repledge of ¥6,175,242 and ¥7,019,727 at March 31, 2017 and September 30, 2017) (including ¥14,957,135 and ¥17,267,604 at March 31, 2017 and September 30, 2017 measured at fair value under fair value option)		575,210	539,809
Investment securities:
Total investment securities		1,784,178	1,637,587
Net loans		17,242,982	12,713,190
All other assets		324,559	271,041
Total assets		19,944,347	15,173,861
LIABILITIES AND EQUITY
Total deposits
Other short-term borrowings		39,694	22,044
Long-term debt (including ¥377,423 and ¥348,196 at March 31, 2017 and September 30, 2017 measured at fair value under fair value option)		585,826	547,971
All other liabilities		116,005	49,447
Total liabilities		¥ 741,525	¥ 619,462
[1]	The above table includes loans held for sale of ¥185,940 million at March 31, 2017 and ¥148,761 million at September 30, 2017, respectively.

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - JPY (¥) ¥ in Millions	Sep. 30, 2017	Mar. 31, 2017
Statement of Financial Position [Abstract]
Trading account assets pledged that secured parties are permitted to sell or repledge	¥ 7,019,727	¥ 6,175,242
Trading account assets measured at fair value under fair value option	17,267,604	14,957,135
Available-for-sale securities pledged that secured parties are permitted to sell or repledge	7,390,850	11,133,433
Held-to-maturity securities pledged that secured parties are permitted to sell or repledge	687,931	446,146
Held-to-maturity securities, Fair value	3,277,809	3,637,751
Loans, net of unearned income, unamortized premiums and deferred loan fees, pledged that secured parties are permitted to sell or repledge	947,100	1,010,730
Due to trust account and other short-term borrowings measured at fair value under fair value option	224,779	112,424
Long-term debt measured at fair value under fair value option	¥ 348,196	¥ 377,423
Common stock, authorized	33,000,000,000	33,000,000,000
Common stock, issued	14,027,694,920	14,168,853,820
Common stock, stated value
Treasury stock, shares	737,911,321	739,564,216

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - JPY (¥) shares in Thousands, ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans, including fees		¥ 1,098,107	¥ 997,030
Deposits in other banks		57,768	36,982
Investment securities		185,852	187,835
Trading account assets		224,262	212,587
Call loans, funds sold, and receivables under resale agreements and securities borrowing transactions		36,109	31,224
Total		1,602,098	1,465,658
Interest expense:
Deposits		240,723	165,897
Call money, funds purchased, and payables under repurchase agreements and securities lending transactions		57,620	31,379
Due to trust account, other short-term borrowings, and trading account liabilities		41,919	27,338
Long-term debt		141,590	135,631
Total		481,852	360,245
Net interest income		1,120,246	1,105,413
Credit for credit losses		186,568	58,681
Net interest income after credit for credit losses		1,306,814	1,164,094
Non-interest income:
Fees and commissions income		701,916	687,853
Foreign exchange losses-net		(3,025)	(20,704)
Trading account profits-net		69,428	284,845
Investment securities gains-net	[1]	176,149	127,028
Equity in earnings of equity method investees-net		88,717	128,468
Other non-interest income		44,282	44,292
Total		1,077,467	1,251,782
Non-interest expense:
Salaries and employee benefits		537,214	555,671
Occupancy expenses-net		88,567	90,369
Fees and commissions expenses		146,625	133,243
Outsourcing expenses, including data processing		136,326	123,961
Depreciation of premises and equipment		46,159	47,861
Amortization of intangible assets		116,878	112,576
Impairment of intangible assets		16,591	968
Insurance premiums, including deposit insurance		45,103	45,936
Communications		28,158	27,843
Taxes and public charges		45,152	45,031
Other non-interest expenses		163,074	226,629
Total		1,369,847	1,410,088
Income before income tax expense		1,014,434	1,005,788
Income tax expense		234,336	252,472
Net income before attribution of noncontrolling interests		780,098	753,316
Net income (loss) attributable to noncontrolling interests		(10,606)	2,433
Net income attributable to Mitsubishi UFJ Financial Group	[2]	790,704	750,883
Income used for the computation of basic EPS and diluted EPS (Numerator):
Net income attributable to Mitsubishi UFJ Financial Group	[2]	790,704	750,883
Effect of dilutive instruments:
Stock acquisition rights, performance-based plan under Board Incentive Plan and restricted stock units	[2]	(1,951)	(1,416)
Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group and assumed conversions	[2]	¥ 788,753	¥ 749,467
Shares used for the computation of basic EPS and diluted EPS (Denominator):
Weighted average common shares outstanding	[2]	13,354,885	13,652,274
Effect of dilutive instruments:
Stock acquisition rights and the common shares of MUFG under Board Incentive Plan	[2]	1,964	15,057
Weighted average common shares for diluted computation	[2]	13,356,849	13,667,331
Earnings per common share applicable to common shareholders of Mitsubishi UFJ Financial Group
Basic earnings per common share-Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group		¥ 59.21	¥ 55
Diluted earnings per common share-Earnings applicable to common shareholders of Mitsubishi UFJ Financial Group		59.05	54.84
Cash dividend per common share		¥ 9	¥ 9
[1]	The following credit losses are included in Investment securities gains-net: Decline in fair value by ¥44 million and ¥95 million; Other comprehensive income-net by ¥13 million and ¥13 million; Total credit losses by ¥57 million and ¥108 million, for the six months ended September 30, 2016 and 2017, respectively.
[2]	From the six month period ended on September 30, 2017, information on earnings per common share ("EPS"), which was previously disclosed in the footnote to Condensed Consolidated Financial Statements, started to be disclosed within Condensed Consolidated Statements of Income.

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Income (Unaudited) (Parenthetical) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Decline in fair value	¥ 95	¥ 44
Other comprehensive income-net	13	13
Total credit losses	¥ 108	¥ 57

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income before attribution of noncontrolling interests		¥ 780,098	¥ 753,316
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on investment securities	[1]	247,454	(134,423)
Net debt valuation adjustments		(5,779)	866
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges		(626)	19,205
Defined benefit plans		24,609	18,370
Foreign currency translation adjustments		(35,925)	(758,994)
Total		229,733	(854,976)
Comprehensive income (loss)		1,009,831	(101,660)
Net income (loss) attributable to noncontrolling interests		(10,606)	2,433
Other comprehensive loss attributable to noncontrolling interests		(3,586)	(30,537)
Comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group		¥ 1,024,023	¥ (73,556)
[1]	Unrealized gains of ¥9 million and ¥9 million, net of tax, related to debt securities with credit component were realized and included in net income before attribution of noncontrolling interests for the six months ended September 30, 2016 and 2017, respectively.

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net unrealized holding gains (losses) on investment securities, unrealized gains related to debt securities with credit component realized and included in net income before attribution of noncontrolling interests, net of tax	¥ 9	¥ 9

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Equity (Unaudited) - JPY (¥) ¥ in Millions	Total		Mitsubishi UFJ Financial Group Shareholders' Equity [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Capital Stock [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Capital Surplus [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Retained Earnings Appropriated for Legal Reserve [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Unappropriated Retained Earnings [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Accumulated Other Comprehensive Income, Net of Taxes [Member]	Mitsubishi UFJ Financial Group Shareholders' Equity [Member]Treasury Stock, at Cost [Member]	Noncontrolling Interests [Member]
Balance at beginning of period at Mar. 31, 2016				¥ 2,090,270	¥ 5,958,929	¥ 239,571	¥ 3,980,257	¥ 2,301,259	¥ (299,661)	¥ 577,642
Stock-based compensation					(1,281)
Purchases of shares of treasury stock									(109,760)
Sales of shares of treasury stock									3,108
Initial subscriptions of noncontrolling interests										52,679
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders										6,945
Increase (Decrease) in noncontrolling interests related to deconsolidation of subsidiaries										(457,886)
Net income attributable to Mitsubishi UFJ Financial Group	¥ 750,883	[1]					750,883
Cash dividends: Common stock-¥9.00 per share in 2016 and 2017							(124,092)
Losses on sales of shares of treasury stock							(1,004)
Net decrease resulting from changes in interests in consolidated subsidiaries, consolidated variable interest entities, and affiliated companies									24
Net income (loss) attributable to noncontrolling interests	2,433									2,433
Dividends paid to noncontrolling interests										(6,005)
Net change during the period, Other comprehensive loss, net of taxes	(854,976)							(824,439)		(30,537)
Other-net										(348)
Balance at end of period at Sep. 30, 2016	14,704,969		¥ 13,964,064	2,090,270	5,957,648	239,571	4,602,171	1,480,693	(406,289)	740,905
Effect of adopting new guidance | Consolidation of Certain Variable Interest Entities [Member]							(3,873)	3,873		595,982
Balance at beginning of period at Mar. 31, 2017	14,764,708			2,090,270	5,956,644	239,571	3,931,612	2,281,423	(513,988)	779,176
Stock-based compensation					(2,802)
Purchases of shares of treasury stock									(101,028)
Sales of shares of treasury stock									2,029
Initial subscriptions of noncontrolling interests										34,383
Transactions between the consolidated subsidiaries and the related noncontrolling interest shareholders										(57,715)
Increase (Decrease) in noncontrolling interests related to deconsolidation of subsidiaries										8,607
Purchase of shares of Mitsubishi UFJ NICOS from noncontrolling interest shareholder	(34,751)				(34,751)					(15,390)
Net income attributable to Mitsubishi UFJ Financial Group	790,704	[1]					790,704
Cash dividends: Common stock-¥9.00 per share in 2016 and 2017							(120,906)
Losses on sales of shares of treasury stock							(8)
Retirement of common stock					(98,952)				98,952
Net decrease resulting from changes in interests in consolidated subsidiaries, consolidated variable interest entities, and affiliated companies									36
Net income (loss) attributable to noncontrolling interests	(10,606)									(10,606)
Dividends paid to noncontrolling interests										(6,810)
Net change during the period, Other comprehensive loss, net of taxes	229,733							233,319		(3,586)
Other-net					59					130
Balance at end of period at Sep. 30, 2017	¥ 15,480,373		¥ 14,752,184	¥ 2,090,270	¥ 5,820,198	¥ 239,571	¥ 4,601,402	¥ 2,514,742	¥ (513,999)	¥ 728,189
[1]	From the six month period ended on September 30, 2017, information on earnings per common share ("EPS"), which was previously disclosed in the footnote to Condensed Consolidated Financial Statements, started to be disclosed within Condensed Consolidated Statements of Income.

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Equity (Unaudited) (Parenthetical) - ¥ / shares	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash dividends: Common stock, per share	¥ 9	¥ 9
Mitsubishi UFJ Financial Group Shareholders' Equity [Member] | Unappropriated Retained Earnings [Member]
Cash dividends: Common stock, per share	¥ 9	¥ 9

Condensed Consolidated Statem10

Condensed Consolidated Statements of Cash Flows (Unaudited) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income before attribution of noncontrolling interests		¥ 780,098	¥ 753,316
Adjustments to reconcile net income before attribution of noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization		163,037	160,437
Impairment of intangible assets		16,591	968
Credit for credit losses		(186,568)	(58,681)
Investment securities gains-net	[1]	(176,149)	(127,028)
Foreign exchange losses (gains)-net		(152,647)	409,477
Equity in earnings of equity method investees-net		(88,717)	(128,468)
Provision for deferred income tax expense		76,774	108,575
Decrease (increase) in trading account assets, excluding foreign exchange contracts		2,413,956	(6,153,167)
Increase (decrease) in trading account liabilities, excluding foreign exchange contracts		(3,197,859)	6,263,280
Decrease (increase) in accrued interest receivable and other receivables		(67,375)	75,428
Decrease in accrued interest payable and other payables		(28,880)	(47,525)
Net increase (decrease) in accrued income taxes and decrease (increase) in income tax receivables		15,428	(75,308)
Net decrease (increase) in collateral for derivative transactions		(513,799)	90,233
Increase in cash collateral for the use of Bank of Japan's settlement infrastructure	[2]	(430,802)
Other-net		(302,961)	236,413
Net cash provided by (used in) operating activities		(1,679,873)	1,507,950
Cash flows from investing activities:
Proceeds from sales and maturities of Available-for-sale securities (including proceeds from sales of securities under the fair value option)		37,518,425	26,540,052
Purchases of Available-for-sale securities (including purchases of securities under the fair value option)		(36,675,462)	(25,296,456)
Proceeds from maturities of Held-to-maturity securities		670,897	310,331
Purchases of Held-to-maturity securities		(352,035)	(216,907)
Proceeds from sales and redemption of Other investment securities		4,036	4,927
Acquisition of MUFG Capital Analytics LLC (formerly Capital Analytics II LLC), a subsidiary of MUTB, net of cash acquired			(4,154)
Purchase of common stock and preferred stock investment in Security Bank Corporation, an equity method investee of BTMU			(91,993)
Purchases of Other investment securities		(2,953)	(6,467)
Net decrease in loans		485,079	2,392,503
Net decrease (increase) in interest-earning deposits in other banks		(739,000)	2,880,820
Net decrease in call loans, funds sold, and receivables under resale agreements and securities borrowing transactions		2,602,481	516,453
Capital expenditures for premises and equipment		(72,807)	(58,185)
Purchases of intangible assets		(112,037)	(114,887)
Proceeds from sales of consolidated VIEs and subsidiaries-net		54,683	113,566
Other-net		(23,554)	(60,972)
Net cash provided by investing activities		3,357,753	6,908,631
Cash flows from financing activities:
Net increase in deposits		718,227	2,814,107
Net increase in call money, funds purchased, and payables under repurchase agreements and securities lending transactions		755,086	3,863,587
Net decrease in due to trust account		(247,230)	(3,627,935)
Net increase (decrease) in other short-term borrowings		340,236	(1,975,037)
Proceeds from issuance of long-term debt		3,941,248	7,491,596
Repayments of long-term debt		(1,614,508)	(4,276,373)
Proceeds from sales of treasury stock		1,219	4
Dividends paid		(120,911)	(124,079)
Payments for acquisition of treasury stock		(101,028)	(109,760)
Other-net		(57,792)	13,944
Net cash provided by financing activities		3,614,547	4,070,054
Effect of exchange rate changes on cash and cash equivalents		12,324	(169,032)
Net increase in cash and cash equivalents		5,304,751	12,317,603
Cash and cash equivalents at beginning of period		25,682,741	8,656,322
Cash and cash equivalents at end of period		30,987,492	20,973,925
Cash paid during the period for:
Interest		480,203	368,201
Income taxes, net of refunds		134,396	212,264
Non-cash investing and financing activities:
Assets acquired under capital lease arrangements		3,045	3,149
Adoption of new guidance on consolidation of certain variable interest entities:
Increase in total assets, excluding cash and cash equivalents			628,236
Increase in total liabilities			32,254
Increase in noncontrolling interests			¥ 595,982
Purchase of shares of Mitsubishi UFJ NICOS from noncontrolling interest shareholder:
Increase in other liabilities		50,000
Decrease in noncontrolling interests		15,390
Decrease in capital surplus		34,751
Increase in accumulated other comprehensive income, net of taxes		¥ 141
[1]	The following credit losses are included in Investment securities gains-net: Decline in fair value by ¥44 million and ¥95 million; Other comprehensive income-net by ¥13 million and ¥13 million; Total credit losses by ¥57 million and ¥108 million, for the six months ended September 30, 2016 and 2017, respectively.
[2]	Since December 2016, the new cash collateral system was introduced that enabled banks to pledge cash for the use of Bank of Japan's settlement infrastructure. Such cash collateral was paid to Japanese Banks' Payment Clearing Network and is included in Other Assets on the condensed consolidated balance sheets.

Basis of Semiannual Condensed C

Basis of Semiannual Condensed Consolidated Financial Statements [Text Block]	6 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Semiannual Condensed Consolidated Financial Statements [Text Block]	1. BASIS OF SEMIANNUAL CONDENSED CONSOLIDATED FINANCIAL STATEMENTS Description of Business Mitsubishi UFJ Financial Group, Inc. (“MUFG”) is a holding company for The Bank of Tokyo-Mitsubishi UFJ, Ltd. (“BTMU”), Mitsubishi UFJ Trust and Banking Corporation (“MUTB”), Mitsubishi UFJ Securities Holdings Co., Ltd. (“MUSHD”), Mitsubishi UFJ NICOS Co., Ltd. (“Mitsubishi UFJ NICOS”), and other subsidiaries. MUSHD is an intermediate holding company for Mitsubishi UFJ Morgan Stanley Securities Co., Ltd. (“MUMSS”). Through its subsidiaries and affiliated companies, MUFG engages in a broad range of financial operations, including commercial banking, investment banking, trust banking and asset management services, securities businesses, and credit card businesses, and it provides related services to individual and corporate customers. See Note 16 for more information by business segment. Basis of Financial Statements The accompanying semiannual condensed consolidated financial statements are presented in Japanese yen, the currency of the country in which MUFG is incorporated and principally operates. The accompanying condensed consolidated financial statements include the accounts of MUFG, its subsidiaries and certain variable interest entities (“VIE”s) (together, the “MUFG Group”), and reflect all adjustments (consisting of normal recurring adjustments) that, in the opinion of management, are necessary to conform with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements for the fiscal year ended March 31, 2017. Certain information that would be included in annual financial statements but is not required for semiannual reporting purposes under U.S. GAAP has been omitted or condensed. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Accounting Changes Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships— Contingent Put and Call Options in Debt Instruments— Simplifying the Transition to the Equity Method of Accounting available-for-sale Improvements to Employee Share-Based Payment Accounting Recently Issued Accounting Pronouncements Revenue from Contracts with Customers Recognition and Measurement of Financial Assets and Financial Liabilities— available-for-sale Leases— right-of-use gross-up right-of-use gross-up Recognition of Breakage for Certain Prepaid Stored-Value Products— to require that breakage for those liabilities be accounted for consistent with the breakage model required by the guidance on revenue from contracts with customers for non-financial Measurement of Credit Losses on Financial Instruments available-for-sale Classification of Certain Cash Receipts and Cash Payments— Intra-Entity Transfers of Assets Other Than Inventory— Restricted Cash— beginning-of-period end-of-period Clarifying the Definition of a Business Simplifying the Test for Goodwill Impairment Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost Premium Amortization on Purchased Callable Debt Securities Scope of Modification Accounting Targeted Improvements to Accounting for Hedging Activities

Business Developments _Text Blo

Business Developments [Text Block]	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Business Developments [Text Block]	2. BUSINESS DEVELOPMENTS BTMU’s Acquisition of Security Bank Corporation’s shares On April 1, 2016, BTMU acquired newly issued common shares and preferred shares with voting rights of Security Bank Corporation (“Security Bank”), representing in the aggregate approximately 20.0% of Security Bank’s equity interest for ¥91,993 million. Security Bank is listed on the Philippines Stock Exchange and is not part of any local conglomerate in the Philippines. Considering both BTMU’s ownership of the common stock and preferred stock and representation on the board of directors, the MUFG Group has determined that BTMU has the ability to exercise significant influence over the operating and financial policies of Security Bank and applied the equity method of accounting for its investment. MUTB’s Acquisition of Capital Analytics II LLC On April 30, 2016, MUTB acquired 100% ownership of Capital Analytics II LLC for ¥4,494 million in cash, and thereby recorded goodwill of ¥2,858 million and intangible assets of ¥1,388 million. Capital Analytics II LLC is an overseas fund management company that mainly provides fund administration services for private equity funds. The purpose of this acquisition is to meet the diversified global fund administration needs of its Japanese and overseas customers through the utilization of Capital Analytics II LLC’s unparalleled operational expertise and the MUFG Group’s extensive network. Upon conclusion of the acquisition, Capital Analytics II LLC was renamed MUFG Capital Analytics LLC. During the fiscal year ended March 31, 2017, measurement period adjustments were applied to the acquisition date fair values, which decreased goodwill by ¥115 million. Krungsri’s Acquisition of Hattha Kaksekar Limited On September 12, 2016, Bank of Ayudhya Public Company Limited (“Krungsri”) acquired 100% ownership of Hattha Kaksekar Limited for ¥15,703 million in cash, and thereby recorded goodwill of ¥8,280 million and intangible assets of ¥476 million. Hattha Kaksekar Limited is a financial institution in Cambodia providing financial services primarily to sole proprietors. The purpose of this acquisition is to enable the MUFG Group to tap into the growth of the Cambodian market by leveraging the knowhow of Ngern Tid Lor Co., Ltd., a subsidiary of Krungsri engaged in microfinance in Thailand, with an aim to promote and develop the microfinance business. MUFG’s Acquisition of Hitachi Capital Corporation’s shares On October 3, 2016, MUFG acquired 23.0% of the common shares of Hitachi Capital Corporation (“Hitachi Capital”) for ¥91,877 million from Hitachi, Ltd. Considering both MUFG’s ownership of the common stock and representation on the board of directors, the MUFG Group has determined that MUFG has the ability to exercise significant influence over the operating and financial policies of Hitachi Capital and applied the equity method of accounting for its investment. MUTB’s Acquisition of Rydex Fund Services, LLC On October 4, 2016, MUTB acquired 100% ownership of Rydex Fund Services, LLC for ¥17,431 million in cash, and thereby recorded goodwill of ¥5,232 million and intangible assets of ¥11,507 million. Rydex Fund Services, LLC is an overseas fund management company that mainly provides fund administration services for funds established under the 1940 Investment Companies Act of the United States. The purpose of this acquisition is to meet the diversified global fund administration needs of its Japanese and overseas customers through the utilization of Rydex Fund Services, LLC’s unparalleled operational expertise and the MUFG Group’s extensive network. Upon conclusion of the acquisition, Rydex Fund Services, LLC was renamed MUFG Investor Services (US), LLC. Mitsubishi UFJ NICOS Became a Wholly-Owned Subsidiary On May 15, 2017, MUFG and its subsidiary Mitsubishi UFJ NICOS entered into a share exchange agreement for MUFG to acquire the remaining 15.02% ownership of Mitsubishi UFJ NICOS by agreeing to pay ¥50,000 million cash to the only holder of Mitsubishi UFJ NICOS common stock other than MUFG. The transaction was accounted for as a non-cancellable

Investment Securities _Text Blo

Investment Securities [Text Block]	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Investment Securities [Text Block]	3. INVESTMENT SECURITIES The following tables present the amortized cost, gross unrealized gains and losses, and fair value of Available-for-sale Held-to-maturity At March 31, 2017: Amortized Gross Gross Fair value (in millions) Available-for-sale Debt securities: Japanese national government and Japanese government agency bonds ¥ 25,435,570 ¥ 396,057 ¥ 5,339 ¥ 25,826,288 Japanese prefectural and municipal bonds 1,010,336 9,598 4,445 1,015,489 Foreign governments and official institutions bonds 2,162,897 14,006 26,974 2,149,929 Corporate bonds 1,121,967 20,854 1,089 1,141,732 Residential mortgage-backed securities 1,203,685 551 15,318 1,188,918 Commercial mortgage-backed securities 80,564 454 750 80,268 Asset-backed securities 1,374,754 5,416 1,898 1,378,272 Other debt securities (1) 169,185 4,899 3,295 170,789 Marketable equity securities 2,736,976 3,407,915 6,477 6,138,414 Total ¥ 35,295,934 ¥ 3,859,750 ¥ 65,585 ¥ 39,090,099 Held-to-maturity Debt securities: Japanese national government and Japanese government agency bonds ¥ 1,100,955 ¥ 43,115 ¥ — ¥ 1,144,070 Foreign governments and official institutions bonds 61,135 1,113 — 62,248 Corporate bonds 100 — — 100 Residential mortgage-backed securities 962,492 4,009 11,196 (2) 955,305 Commercial mortgage-backed securities 184,336 5,065 768 (2) 188,633 Asset-backed securities 1,278,303 9,277 185 1,287,395 Total ¥ 3,587,321 ¥ 62,579 ¥ 12,149 ¥ 3,637,751 Notes: (1) Other debt securities in the table above include ¥160,479 million of private placement debt conduit bonds. (2) MUFG Americas Holdings Corporation (“MUAH”) reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale Held-to-maturity At September 30, 2017: Amortized Gross Gross Fair value (in millions) Available-for-sale Debt securities: Japanese national government and Japanese government agency bonds ¥ 22,226,590 ¥ 289,182 ¥ 7,149 ¥ 22,508,623 Japanese prefectural and municipal bonds 1,248,562 6,912 4,863 1,250,611 Foreign governments and official institutions bonds 2,312,548 15,203 26,100 2,301,651 Corporate bonds 1,098,500 15,770 1,204 1,113,066 Residential mortgage-backed securities 1,470,166 983 11,070 1,460,079 Commercial mortgage-backed securities 82,618 694 442 82,870 Asset-backed securities 1,500,616 6,274 1,237 1,505,653 Other debt securities (1) 161,044 4,309 2,267 163,086 Marketable equity securities 2,567,398 3,881,355 6,862 6,441,891 Total ¥ 32,668,042 ¥ 4,220,682 ¥ 61,194 ¥ 36,827,530 Held-to-maturity Debt securities: Japanese national government and Japanese government agency bonds ¥ 1,100,892 ¥ 40,268 ¥ — ¥ 1,141,160 Foreign governments and official institutions bonds 58,633 881 — 59,514 Corporate bonds 50 — — 50 Residential mortgage-backed securities 932,328 3,985 8,686 (2) 927,627 Commercial mortgage-backed securities 174,223 5,237 636 (2) 178,824 Asset-backed securities 964,725 5,988 79 970,634 Total ¥ 3,230,851 ¥ 56,359 ¥ 9,401 ¥ 3,277,809 Notes: (1) Other debt securities in the table above include ¥153,030 million of private placement debt conduit bonds. (2) MUAH reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale Held-to-maturity Other Securities Investment securities other than Available-for-sale Held-to-maturity The remaining balances were investment securities held by certain subsidiaries subject to specialized industry accounting principles for investment companies and broker-dealers and carried at fair value of ¥26,292 million and ¥25,564 million at March 31, 2017 and September 30, 2017, respectively. See Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017 for the valuation techniques and inputs used to estimate the fair values. With respect to cost-method investments of ¥97,774 million and ¥97,774 million at March 31, 2017 and September 30, 2017, respectively, the MUFG Group estimated a fair value using commonly accepted valuation techniques to determine whether the investments were impaired in each reporting period. See Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017 for the details of these commonly accepted valuation techniques. If the fair value of the investment is less than the cost of the investment, the MUFG Group proceeds to evaluate whether the impairment is other-than-temporary. With respect to cost-method investments of ¥432,095 million and ¥431,912 million at March 31, 2017 and September 30, 2017, respectively, the MUFG Group performed a test to determine whether any impairment indicators existed for each investment in each reporting period. If an impairment indicator exists, the MUFG Group estimates the fair value of the cost-method investment. If the fair value of the investment is less than the cost of the investment, the MUFG Group performs an evaluation of whether the impairment is other-than-temporary. The primary method the MUFG Group uses to identify impairment indicators is a comparison of the MUFG Group’s share of an investee’s net assets to the cost of the MUFG Group’s investment in the investee. The MUFG Group also considers whether significant adverse changes in the regulatory, economic or technological environment have occurred with respect to the investee. The MUFG Group periodically monitors the status of each investee including the credit rating, which is generally updated once a year based on the annual financial statements of the issuer. In addition, if an event that could impact the credit rating of an investee occurs, the MUFG Group reassesses the appropriateness of the credit rating assigned to the issuer in order to maintain an updated credit rating. The MUFG Group did not estimate the fair value of cost-method investments, which had aggregated costs of ¥429,313 million and ¥430,311 million at March 31, 2017 and September 30, 2017, respectively, since it was not practical and the MUFG Group identified no impairment indicators. Based on the procedures described above, the MUFG Group recognized other-than-temporary impairment (“OTTI”) losses on the cost-method investments of ¥394 million and ¥284 million for the six months ended September 30, 2016 and 2017, respectively. Each impairment loss was recognized based on the specific circumstances of each individual company. No impairment loss was individually material. Contractual Maturities The amortized cost and fair values of Held-to-maturity Available-for-sale Held-to-maturity debt securities Available-for-sale debt securities Amortized cost Fair value Fair value (in millions) Due in one year or less ¥ 50 ¥ 50 ¥ 12,477,989 Due from one year to five years 164,798 168,113 9,181,806 Due from five years to ten years 1,706,867 1,750,883 4,353,645 Due after ten years 1,359,136 1,358,763 4,372,199 Total ¥ 3,230,851 ¥ 3,277,809 ¥ 30,385,639 Realized Gains and Losses For the six months ended September 30, 2016 and 2017, gross realized gains on sales of Available-for-sale Available-for-sale Other-than-temporary Impairments of Investment Securities For the six months ended September 30, 2016 and 2017, losses resulting from impairment of investment securities to reflect the decline in value considered to be other-than-temporary were ¥32,364 million and ¥6,428 million, respectively, which were included in Investment securities gains—net in the accompanying condensed consolidated statements of income. The losses of ¥32,364 million for the six months ended September 30, 2016 included losses of ¥31,913 million from marketable equity securities and ¥57 million from Available-for-sale Available-for-sale Gross Unrealized Losses and Fair Value The following tables show the gross unrealized losses and fair value of Available-for-sale Held-to-maturity Less than 12 months 12 months or more Total At March 31, 2017: Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value Gross Number of (in millions, except number of securities) Available-for-sale Debt securities: Japanese national government and Japanese government agency bonds ¥ 6,088,856 ¥ 5,339 ¥ — ¥ — ¥ 6,088,856 ¥ 5,339 107 Japanese prefectural and municipal bonds 579,684 4,445 — — 579,684 4,445 139 Foreign governments and official institutions bonds 1,034,336 26,677 115,053 297 1,149,389 26,974 142 Corporate bonds 277,394 933 15,613 156 293,007 1,089 160 Residential mortgage-backed securities 754,557 14,086 81,065 1,232 835,622 15,318 412 Commercial mortgage-backed securities 51,360 748 1,298 2 52,658 750 65 Asset-backed securities 80,059 1,269 128,372 629 208,431 1,898 85 Other debt securities 35,375 1,488 50,845 1,807 86,220 3,295 26 Marketable equity securities 222,950 6,449 554 28 223,504 6,477 111 Total ¥ 9,124,571 ¥ 61,434 ¥ 392,800 ¥ 4,151 ¥ 9,517,371 ¥ 65,585 1,247 Held-to-maturity Debt securities: Residential mortgage-backed securities ¥ 523,237 ¥ 10,736 ¥ 161,453 ¥ 460 ¥ 684,690 ¥ 11,196 263 Commercial mortgage-backed securities 12,906 125 168,724 643 181,630 768 31 Asset-backed securities 25,679 13 101,345 172 127,024 185 5 Total ¥ 561,822 ¥ 10,874 ¥ 431,522 ¥ 1,275 ¥ 993,344 ¥ 12,149 299 Less than 12 months 12 months or more Total At September 30, 2017: Fair value Gross Fair value Gross Fair value Gross Number of (in millions, except number of securities) Available-for-sale Debt securities: Japanese national government and Japanese government agency bonds ¥ 8,258,526 ¥ 6,306 ¥ 85,561 ¥ 843 ¥ 8,344,087 ¥ 7,149 149 Japanese prefectural and municipal bonds 790,305 4,641 16,963 222 807,268 4,863 205 Foreign governments and official institutions bonds 1,271,852 24,457 130,981 1,643 1,402,833 26,100 120 Corporate bonds 310,254 1,093 21,342 111 331,596 1,204 152 Residential mortgage-backed securities 762,855 9,868 151,497 1,202 914,352 11,070 441 Commercial mortgage-backed securities 41,785 441 1,136 1 42,921 442 47 Asset-backed securities 232,469 1,126 14,186 111 246,655 1,237 61 Other debt securities 12,055 184 56,414 2,083 68,469 2,267 22 Marketable equity securities 57,648 6,835 533 27 58,181 6,862 78 Total ¥ 11,737,749 ¥ 54,951 ¥ 478,613 ¥ 6,243 ¥ 12,216,362 ¥ 61,194 1,275 Held-to-maturity Debt securities: Residential mortgage-backed securities ¥ 519,945 ¥ 8,616 ¥ 141,542 ¥ 70 ¥ 661,487 ¥ 8,686 280 Commercial mortgage-backed securities 11,672 140 161,175 496 172,847 636 31 Asset-backed securities 55,044 56 28,929 23 83,973 79 3 Total ¥ 586,661 ¥ 8,812 ¥ 331,646 ¥ 589 ¥ 918,307 ¥ 9,401 314 Evaluating Investment Securities for Other-than-temporary Impairments The following describes the nature of the MUFG Group’s investments and the conclusions reached in determining whether the unrealized losses were temporary or other-than-temporary. Japanese national government and Japanese government agency bonds, Foreign governments and official institutions bonds, and Residential and commercial mortgage-backed securities As of September 30, 2017, unrealized losses associated with these securities were deemed to be attributable to changes in market interest rates rather than a deterioration in the creditworthiness of the underlying obligor. Based on a consideration of factors, including cash flow analysis, the MUFG Group expects to recover the entire amortized cost basis of these securities. Accordingly, such changes are considered to be temporary and no impairment loss has been recorded. Asset-backed securities As of September 30, 2017, unrealized losses on these securities were primarily driven by certain collateralized loan obligations (“CLOs”), highly illiquid securities for which fair values are difficult to determine. Unrealized losses arise from widening credit spreads, deterioration of the credit quality of the underlying collateral, uncertainty regarding the valuation of such securities and the market’s view of the performance of the fund managers. When the fair value of a security is lower than its amortized cost or when any security is subject to a deterioration in credit rating, the MUFG Group undertakes a cash flow analysis of the underlying collateral to estimate the OTTI and confirms the intent and ability to hold these securities until recovery. Based on the analysis performed, no OTTI was identified as of September 30, 2017 and no impairment loss has been recorded. Corporate bonds As of September 30, 2017, unrealized losses associated with corporate bonds were primarily related to private placement bonds issued by Japanese non-public The following table presents a roll-forward of the credit loss component recognized in earnings. The balance at the beginning of each period for the six months ended September 30 represents the credit loss component for which OTTI occurred on debt securities in prior periods. The additions represent the first time a debt security was credit impaired or when subsequent credit impairment has occurred. The credit loss component is reduced when the corporate bonds mature or are sold. Six months ended 2016 2017 (in millions) Balance at beginning of period ¥ 6,691 ¥ 4,125 Additions: Initial credit impairments 35 107 Subsequent credit impairments 22 1 Reductions: Securities sold or matured (939 ) (403 ) Balance at end of period ¥ 5,809 ¥ 3,830 The cumulative declines in fair value of the credit impaired debt securities, which were mainly corporate bonds, held at September 30, 2016 and 2017 were ¥3,850 million and ¥3,200 million, respectively. Of which, the credit loss components recognized in earnings were ¥5,809 million and ¥3,830 million, and the remaining amounts related to all other factors recognized in Accumulated OCI before taxes were ¥1,959 million and ¥630 million at September 30, 2016 and 2017, respectively. Other debt securities As of September 30, 2017, other debt securities primarily consist of private placement debt conduit bonds, which are not rated by external credit rating agencies. The unrealized losses on these bonds result 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 MUFG Group estimates loss projections for each security by assessing the underlying collateral of each security. The MUFG Group 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 OTTI, which is performed when the fair value of a security is lower than its amortized cost and potential impairment is identified. Based on the analysis, no OTTI losses were recorded in the accompanying condensed consolidated statements of income. Marketable equity securities The MUFG Group determines whether unrealized losses on marketable equity securities are temporary based on its ability and positive intent to hold the investments for a period of time sufficient to allow for any anticipated recovery and the results of its review conducted to identify and evaluate investments that have indications of possible impairment. Impairment is evaluated considering various factors, and their relative significance varies from case to case. The MUFG Group’s review includes, but is not limited to, consideration of the following factors: The length of time that the fair value of the investment has been below cost The extent to which the fair value of investments has been below cost as of the end of the reporting period The financial condition and near-term prospects of the issuer At September 30, 2017, unrealized losses on marketable equity securities which have been in a continuous loss position are considered temporary based on the evaluation as described above.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses [Text Block]	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Loans and Allowance for Credit Losses [Text Block]	4. LOANS AND ALLOWANCE FOR CREDIT LOSSES Loans at March 31, 2017 and September 30, 2017 by domicile and industry of the borrower are summarized below. Classification of loans by industry is based on the industry segment loan classifications as defined by the Bank of Japan. March 31, September 30, (in millions) Domestic: Manufacturing ¥ 11,796,803 ¥ 11,478,200 Construction 819,262 747,597 Real estate 11,622,372 11,628,219 Services 2,549,300 2,483,356 Wholesale and retail 7,970,579 8,111,508 Banks and other financial institutions (1) 5,223,906 4,928,322 Communication and information services 1,634,584 1,578,257 Other industries 8,898,712 8,653,551 Consumer 16,491,010 16,292,794 Total domestic 67,006,528 65,901,804 Foreign: Governments and official institutions 1,037,795 1,132,064 Banks and other financial institutions (1) 13,844,964 14,333,357 Commercial and industrial 30,279,641 30,544,651 Other 6,334,551 6,603,552 Total foreign 51,496,951 52,613,624 Unearned income, unamortized premiums—net and deferred loan fees—net (288,507 ) (280,005 ) Total (2) ¥ 118,214,972 ¥ 118,235,423 Notes: (1) Loans to so-called “non-bank Non-bank (2) The above table includes loans held for sale of ¥185,940 million at March 31, 2017 and ¥148,761 million at September 30, 2017, respectively. The MUFG Group classifies its loan portfolio into the following portfolio segments—Commercial, Residential, Card, MUAH, and Krungsri based on the grouping used by the MUFG Group to determine the allowance for credit losses. The MUFG Group further classifies the Commercial segment into classes based on initial measurement attributes, risk characteristics, and its method of monitoring and assessing credit risk. See Note 1 to the consolidated financial statements for the fiscal year ended March 31, 2017 for further information. Nonaccrual Loans Originated loans are generally placed on nonaccrual status when substantial doubt exists as to the full and timely collection of either principal or interest, when principal or interest is contractually past due one month or more with respect to loans within all classes of the Commercial segment, three months or more with respect to loans within the Card, MUAH, and Krungsri segments, and six months or more with respect to loans within the Residential segment. See Note 1 to the consolidated financial statements for the fiscal year ended March 31, 2017 for further information. The nonaccrual loans by class at March 31, 2017 and September 30, 2017 is shown below: March 31, September 30, (in millions) Commercial Domestic ¥ 471,148 ¥ 464,509 Manufacturing 185,095 170,053 Construction 15,202 11,928 Real estate 44,374 36,058 Services 38,602 34,240 Wholesale and retail 131,213 121,408 Banks and other financial institutions 2,432 1,404 Communication and information services 18,685 22,673 Other industries 10,034 43,559 Consumer 25,511 23,186 Foreign-excluding MUAH and Krungsri 191,889 121,698 Residential 75,399 72,577 Card 61,424 61,350 MUAH 82,150 54,056 Krungsri 94,902 107,406 Total (1) ¥ 976,912 ¥ 881,596 Note: (1) The above table does not include loans held for sale of nil and ¥8,549 million at March 31, 2017 and September 30, 2017, respectively, and loans acquired with deteriorated credit quality of ¥9,720 million and ¥8,281 million, at March 31, 2017 and September 30, 2017, respectively. Impaired Loans The MUFG Group’s impaired loans primarily include nonaccrual loans and troubled debt restructurings (“TDRs”). The following table shows information about impaired loans by class at March 31, 2017 and September 30, 2017: Recorded Loan Balance At March 31, 2017: Requiring Not Requiring (1) Total (2) Unpaid Related (in millions) Commercial Domestic ¥ 875,977 ¥ 187,738 ¥ 1,063,715 ¥ 1,107,203 ¥ 608,122 Manufacturing 555,009 39,587 594,596 602,038 411,787 Construction 15,007 9,068 24,075 24,907 9,107 Real estate 53,048 30,274 83,322 90,797 14,987 Services 48,304 23,162 71,466 78,097 31,074 Wholesale and retail 160,422 53,760 214,182 224,141 115,673 Banks and other financial institutions 1,836 607 2,443 2,443 1,674 Communication and information services 14,166 10,652 24,818 26,641 10,565 Other industries 10,714 5,806 16,520 17,403 7,226 Consumer 17,471 14,822 32,293 40,736 6,029 Foreign-excluding MUAH and Krungsri 262,887 23,019 285,906 309,975 164,682 Loans acquired with deteriorated credit quality 8,013 — 8,013 11,513 3,619 Residential 120,465 6,557 127,022 154,006 46,971 Card 71,849 462 72,311 80,392 20,523 MUAH 77,160 16,292 93,452 113,414 19,173 Krungsri 44,679 20,752 65,431 71,075 19,118 Total (3) ¥ 1,461,030 ¥ 254,820 ¥ 1,715,850 ¥ 1,847,578 ¥ 882,208 Recorded Loan Balance At September 30, 2017: Requiring Not Requiring (1) Total (2) Unpaid Related (in millions) Commercial Domestic ¥ 798,605 ¥ 174,397 ¥ 973,002 ¥ 1,011,187 ¥ 481,924 Manufacturing 465,650 38,861 504,511 510,778 264,592 Construction 12,106 7,600 19,706 20,515 8,221 Real estate 48,164 25,540 73,704 79,420 12,289 Services 41,362 20,071 61,433 65,892 28,420 Wholesale and retail 149,155 50,112 199,267 209,028 107,728 Banks and other financial institutions 1,634 27 1,661 1,661 1,354 Communication and information services 19,999 8,254 28,253 29,661 16,303 Other industries 47,146 7,934 55,080 56,503 38,546 Consumer 13,389 15,998 29,387 37,729 4,471 Foreign-excluding MUAH and Krungsri 141,967 43,722 185,689 211,938 70,803 Loans acquired with deteriorated credit quality 9,703 — 9,703 17,683 3,939 Residential 113,729 6,130 119,859 145,237 26,785 Card 69,440 408 69,848 77,497 20,457 MUAH 50,796 29,304 80,100 92,992 9,957 Krungsri 56,160 21,949 78,109 85,136 28,412 Total (3) ¥ 1,240,400 ¥ 275,910 ¥ 1,516,310 ¥ 1,641,670 ¥ 642,277 Notes: (1) These loans do not require an allowance for credit losses because the recorded loan balance equals, or does not exceed, the present value of expected future cash flows discounted at the loans’ effective interest rate, loans’ observable market price, or the fair value of the collateral if the loan is a collateral-dependent loan. (2) Included in impaired loans at March 31, 2017 and September 30, 2017 are accrual TDRs as follows: ¥688,746 million and ¥574,719 million—Commercial; ¥50,213 million and ¥45,957 million—Residential; ¥32,564 million and ¥30,467 million—Card; ¥24,708 million and ¥35,667 million—MUAH; and ¥23,588 million and ¥24,428 million—Krungsri, respectively. (3) In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥9,879 million and ¥21,585 million at March 31, 2017 and September 30, 2017, respectively. The following table shows information regarding the average recorded loan balance and recognized interest income on impaired loans for the six months ended September 30, 2016 and 2017: 2016 2017 Average Recognized Average Recognized (in millions) Commercial Domestic ¥ 999,938 ¥ 6,238 ¥ 952,510 ¥ 4,830 Manufacturing 484,687 2,505 509,211 1,812 Construction 24,336 200 20,112 144 Real estate 100,849 726 77,940 574 Services 80,076 569 62,750 381 Wholesale and retail 217,657 1,469 190,328 1,109 Banks and other financial institutions 641 4 2,030 7 Communication and information services 25,560 264 24,872 192 Other industries 26,766 207 34,783 387 Consumer 39,366 294 30,484 224 Foreign-excluding MUAH and Krungsri 294,123 1,977 235,723 3,573 Loans acquired with deteriorated credit quality 11,051 371 8,817 563 Residential 137,247 971 123,441 846 Card 76,953 1,334 71,080 1,052 MUAH 43,181 467 64,293 898 Krungsri 47,091 1,549 71,176 1,788 Total ¥ 1,609,584 ¥ 12,907 ¥ 1,527,040 ¥ 13,550 Interest income on nonaccrual loans for all classes was recognized on a cash basis when ultimate collectibility of principal was certain. Otherwise, cash receipts were applied as principal reductions. Interest income on accruing impaired loans, including TDRs, was recognized on an accrual basis to the extent that the collectibility of interest income was reasonably certain based on management’s assessment. The following table shows a roll-forward of accrual TDRs and other impaired loans (including nonaccrual TDRs) for the six months ended September 30, 2016 and 2017: 2016 2017 (in millions) Accrual TDRs: Balance at beginning of period ¥ 613,844 ¥ 819,819 Additions (new accrual TDR status) (1) 358,224 65,483 Transfers to other impaired loans (including nonaccrual TDRs) (28,876 ) (16,624 ) Loans sold (1,594 ) (16,776 ) Principal payments and other (115,714 ) (140,664 ) Balance at end of period (1) ¥ 825,884 ¥ 711,238 Other impaired loans (including nonaccrual TDRs): Balance at beginning of period ¥ 1,111,306 ¥ 896,031 Additions (new other impaired loans (including nonaccrual TDRs) status) (1)(2) 196,443 145,885 Charge-off (59,880 ) (57,238 ) Transfers to accrual TDRs (312,649 ) (20,000 ) Loans sold (12,951 ) (22,482 ) Principal payments and other (167,508 ) (137,124 ) Balance at end of period (1) ¥ 754,761 ¥ 805,072 Notes: (1) For the six months ended September 30, 2016, lease receivables of ¥51 million and ¥62 million in the Krungsri segment, which were accrual TDRs and nonaccrual TDRs, respectively, are excluded from the additions of accrual TDRs and other impaired loans, respectively, and the related ending balances of such TDRs amounting to ¥3,141 million and ¥772 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2016. For the six months ended September 30, 2017, lease receivables of ¥880 million and ¥70 million in the Krungsri segment, which were accrual TDRs and nonaccrual TDRs, respectively, are excluded from the additions of accrual TDRs and other impaired loans, respectively, and the related ending balances of such TDRs amounting to ¥4,644 million and ¥628 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2017. (2) Included in the additions of other impaired loans for the six months ended September 30, 2016 and 2017 are nonaccrual TDRs as follows: ¥5,527 million and ¥6,489 million—Card; ¥13,967 million and ¥3,366 million—MUAH; and ¥3,484 million and ¥6,108 million—Krungsri, respectively. Troubled Debt Restructurings The following table summarizes the MUFG Group’s TDRs by class for the six months ended September 30, 2016 and 2017: 2016 2017 Troubled Debt Troubled Debt Troubled Debt Troubled Debt Pre- Post- Recorded Pre- Post- Recorded (in millions) Commercial (1)(3) Domestic ¥ 279,767 ¥ 279,767 ¥ 2,790 ¥ 28,645 ¥ 28,603 ¥ 2,996 Manufacturing 251,468 251,468 1,089 12,502 12,460 368 Construction 1,287 1,287 — 142 142 — Real estate 4,796 4,796 — 1,107 1,107 10 Services 3,024 3,024 158 2,343 2,343 680 Wholesale and retail 15,046 15,046 1,510 9,889 9,889 1,778 Banks and other financial institutions — — — 246 246 — Communication and information services 2,001 2,001 — 1,072 1,072 135 Other industries 948 948 — 425 425 — Consumer 1,197 1,197 33 919 919 25 Foreign-excluding MUAH and Krungsri 49,767 49,767 — 9,983 9,983 — Loans acquired with deteriorated credit quality 1,030 1,030 — — — — Residential (1)(3) 7,160 7,160 78 5,459 5,459 124 Card (2)(3) 8,244 8,056 2,027 9,570 9,334 1,977 MUAH (2)(3) 21,721 21,608 1,641 18,878 18,878 2,331 Krungsri (2)(3) 13,927 13,927 1,198 9,856 9,856 1,735 Total ¥ 381,616 ¥ 381,315 ¥ 7,734 ¥ 82,391 ¥ 82,113 ¥ 9,163 Notes: (1) TDRs for the Commercial and Residential segments include accruing loans, and do not include nonaccrual loans. (2) TDRs for the Card, MUAH and Krungsri segments include accrual and nonaccrual loans. (3) For the six months ended September 30, 2016, extension of the stated maturity date of loans was the primary concession type in the Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card and Commercial segments and payment deferrals was the primary concession type in the MUAH segment. For the six months ended September 30, 2017, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUAH and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segments. The following table summarizes outstanding recorded investment balances of TDRs by class at March 31, 2017 and September 30, 2017: March 31, September 30, (in millions) Commercial (1) Domestic ¥ 592,578 ¥ 508,498 Manufacturing 409,500 334,467 Construction 8,881 7,778 Real estate 38,953 37,645 Services 32,864 27,192 Wholesale and retail 82,968 77,857 Banks and other financial institutions 11 256 Communication and information services 6,133 5,580 Other industries 6,486 11,523 Consumer 6,782 6,200 Foreign-excluding MUAH and Krungsri 96,168 66,221 Residential (1) 50,213 45,957 Card (2) 72,311 69,848 MUAH (2) 69,830 66,593 Krungsri (2) 46,651 52,308 Total ¥ 927,751 ¥ 809,425 Notes: (1) TDRs for the Commercial and Residential segments include accruing loans and do not include nonaccrual loans. (2) TDRs for the Card, MUAH and Krungsri segments include accrual and nonaccrual loans. Included in the outstanding recorded investment balances as of March 31, 2017 and September 30, 2017 are nonaccrual TDRs as follows: ¥39,747 million and ¥39,381 million—Card; ¥45,122 million and ¥30,926 million—MUAH; and ¥18,998 million and ¥23,236 million—Krungsri, respectively. A modification of terms of a loan under a TDR mainly involves: (i) a reduction in the stated interest rate applicable to the loan, (ii) an extension of the stated maturity date of the loan, (iii) a partial forgiveness of the principal of the loan, or (iv) a combination of all of these. Those loans are also considered impaired loans, and hence the allowance for credit losses is separately established for each loan. As a result, the amount of allowance for credit losses increases in many cases upon classification as a TDR loan. The amount of pre-modification TDRs for the Commercial and Residential segments in the above tables include accruing loans, and do not include nonaccrual loans. Once a loan is classified as a nonaccrual loan, a modification would have little likelihood of resulting in the recovery of the loan in view of the severity of the financial difficulty of the borrower. Therefore, even if a nonaccrual loan is modified, the loan continues to be classified as a nonaccrual loan. The vast majority of modifications to nonaccrual loans are temporary extensions of the maturity dates, typically for periods up to 90 days, and continually made as the borrower is unable to repay or refinance the loan at the extended maturity. Accordingly, the impact of such TDRs on the outstanding recorded investment is immaterial, and the vast majority of nonaccrual TDRs have subsequently defaulted. TDRs that subsequently defaulted in the Commercial and Residential segments in the above tables include those accruing loans that became past due one month or more within the Commercial segment and six months or more within the Residential segment, and those accruing loans reclassified to nonaccrual loans due to financial difficulties even without delinquencies. This is because classification as a nonaccrual loan is regarded as default under the MUFG Group’s credit policy. Also, the MUFG Group defines default as payment default for the purpose of the disclosure. In regards to the Card, MUAH and Krungsri segments, the TDRs in the above tables represent nonaccrual and accruing loans, and the defaulted loans in the above table represent nonaccruing and accruing loans that became past due one month or more within the Card segment, 60 days or more within the MUAH segment, and six months or more within the Krungsri segment. Historical payment defaults are one of the factors considered when projecting future cash flows in determining the allowance for credit losses for each segment. Credit Quality Indicator Credit quality indicators of loans by class at March 31, 2017 and September 30, 2017 are shown below: At March 31, 2017: Normal Close Likely to become Total (1) (in millions) Commercial Domestic ¥ 49,572,413 ¥ 2,161,965 ¥ 296,961 ¥ 52,031,339 Manufacturing 10,882,533 821,062 65,112 11,768,707 Construction 753,879 53,255 11,550 818,684 Real estate 11,137,637 352,785 42,382 11,532,804 Services 2,267,272 237,067 31,202 2,535,541 Wholesale and retail 7,403,680 462,577 98,423 7,964,680 Banks and other financial institutions 5,207,774 14,341 892 5,223,007 Communication and information services 1,573,518 45,342 15,357 1,634,217 Other industries 8,725,914 125,725 8,086 8,859,725 Consumer 1,620,206 49,811 23,957 1,693,974 Foreign-excluding MUAH and Krungsri 36,134,401 971,228 189,599 37,295,228 Loans acquired with deteriorated credit quality 16,503 12,572 5,065 34,140 Total ¥ 85,723,317 ¥ 3,145,765 ¥ 491,625 ¥ 89,360,707 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 14,256,263 ¥ 76,185 ¥ 14,332,448 Card ¥ 531,331 ¥ 61,822 ¥ 593,153 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 3,837,763 ¥ 22,949 ¥ 4,879,158 ¥ 133,032 ¥ 151,553 ¥ 9,024,455 Normal Special Substandard or Total (1) (in millions) Krungsri ¥ 4,672,435 ¥ 195,472 ¥ 98,335 ¥ 4,966,242 At September 30, 2017: Normal Close Watch Likely to become Total (1) (in millions) Commercial Domestic ¥ 48,998,517 ¥ 1,832,425 ¥ 314,006 ¥ 51,144,948 Manufacturing 10,741,717 655,748 63,955 11,461,420 Construction 687,938 48,890 10,203 747,031 Real estate 11,198,972 309,827 35,400 11,544,199 Services 2,246,457 198,002 27,211 2,471,670 Wholesale and retail 7,596,267 408,725 89,977 8,094,969 Banks and other financial institutions 4,915,187 11,632 1,404 4,928,223 Communication and information services 1,513,008 44,328 20,585 1,577,921 Other industries 8,497,806 110,830 42,539 8,651,175 Consumer 1,601,165 44,443 22,732 1,668,340 Foreign-excluding MUAH and Krungsri 37,670,119 739,011 118,760 38,527,890 Loans acquired with deteriorated credit quality 14,230 12,576 4,721 31,527 Total ¥ 86,682,866 ¥ 2,584,012 ¥ 437,487 ¥ 89,704,365 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 14,081,156 ¥ 70,189 ¥ 14,151,345 Card ¥ 530,913 ¥ 61,725 ¥ 592,638 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 3,963,344 ¥ 17,136 ¥ 4,612,200 ¥ 74,704 ¥ 133,840 ¥ 8,801,224 Normal Special Substandard or Total (1) (in millions) Krungsri ¥ 4,820,843 ¥ 185,274 ¥ 109,834 ¥ 5,115,951 Notes: (1 ) Total loans in the above table do not include loans held for sale, and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees. (2 ) Total loans of MUAH do not include Federal Deposit Insurance Corporation (“FDIC”) covered loans and small business loans which are not individually rated totaling ¥40,534 million and ¥1,144 million at March 31, 2017 and September 30, 2017, respectively. The MUFG Group will be reimbursed for a substantial portion of any future losses on FDIC covered loans under the terms of the FDIC loss share agreements. For a discussion and explanation of the MUFG Group’s credit quality indicator, see Note 4 to the consolidated financial statements for the fiscal year ended March 31, 2017. For the Commercial, Residential and Card segments, credit quality indicators at March 31, 2017 and September 30, 2017 are based on information as of March 31, 2017 and September 30, 2017, respectively. For the MUAH and Krungsri segments, credit quality indicators at March 31, 2017 and September 30, 2017 are generally based on information as of December 31, 2016 and June 30, 2017, respectively. Past Due Analysis Ages of past due loans by class at March 31, 2017 and September 30, 2017 are shown below: At March 31, 2017: 1-3 months Greater Total Current Total (1)(2) Recorded (in millions) Commercial Domestic ¥ 12,410 ¥ 19,468 ¥ 31,878 ¥ 51,999,461 ¥ 52,031,339 ¥ 5,817 Manufacturing 1,427 1,671 3,098 11,765,609 11,768,707 20 Construction 281 235 516 818,168 818,684 — Real estate 2,655 5,058 7,713 11,525,091 11,532,804 1,542 Services 1,294 3,225 4,519 2,531,022 2,535,541 4 Wholesale and retail 1,932 1,883 3,815 7,960,865 7,964,680 149 Banks and other financial institutions 3 21 24 5,222,983 5,223,007 — Communication and information services 583 216 799 1,633,418 1,634,217 — Other industries 337 99 436 8,859,289 8,859,725 — Consumer 3,898 7,060 10,958 1,683,016 1,693,974 4,102 Foreign-excluding MUAH and Krungsri 5,268 50,105 55,373 37,239,855 37,295,228 2,244 Residential 78,227 42,335 120,562 14,202,076 14,322,638 31,382 Card 17,490 31,298 48,788 533,484 582,272 — MUAH 25,162 14,212 39,374 8,998,049 9,037,423 1,165 Krungsri 103,055 73,261 176,316 4,780,709 4,957,025 — Total ¥ 241,612 ¥ 230,679 ¥ 472,291 ¥ 117,753,634 ¥ 118,225,925 ¥ 40,608 At September 30, 2017: 1-3 months Greater Total Current Total (1)(2) Recorded (in millions) Commercial Domestic ¥ 10,742 ¥ 19,953 ¥ 30,695 ¥ 51,114,253 ¥ 51,144,948 ¥ 5,487 Manufacturing 1,370 1,724 3,094 11,458,326 11,461,420 — Construction 639 272 911 746,120 747,031 — Real estate 1,385 3,963 5,348 11,538,851 11,544,199 1,665 Services 1,410 948 2,358 2,469,312 2,471,670 68 Wholesale and retail 1,737 4,687 6,424 8,088,545 8,094,969 78 Banks and other financial institutions — 52 52 4,928,171 4,928,223 31 Communication and information services 740 426 1,166 1,576,755 1,577,921 — Other industries 116 1,674 1,790 8,649,385 8,651,175 — Consumer 3,345 6,207 9,552 1,658,788 1,668,340 3,645 Foreign-excluding MUAH and Krungsri 16,279 21,394 37,673 38,490,217 38,527,890 — Residential 76,176 35,200 111,376 14,030,372 14,141,748 25,813 Card 17,357 31,382 48,739 533,271 582,010 — MUAH 24,640 13,552 38,192 8,745,243 8,783,435 1,792 Krungsri 100,176 77,876 178,052 4,930,290 5,108,342 — Total ¥ 245,370 ¥ 199,357 ¥ 444,727 ¥ 117,843,646 ¥ 118,288,373 ¥ 33,092 Notes: (1 ) Total loans in the above table do not include loans held for sale and loans acquired with deteriorated credit quality and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees. (2 ) Total loans of MUAH do not include ¥438 million and nil of FDIC covered loans at March 31, 2017 and September 30, 2017, respectively, which are not subject to the guidance on loans and debt securities acquired with deteriorated credit quality. Allowance for Credit Losses Changes in the allowance for credit losses by portfolio segment for the six months ended September 30, 2016 and 2017 are shown below: Six months ended September 30, 2016: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Balance at beginning of period ¥ 816,559 ¥ 58,598 ¥ 31,187 ¥ 108,454 ¥ 96,332 ¥ 1,111,130 Provision (credit) for credit losses (94,482 ) 480 6,492 1,526 27,303 (58,681 ) Charge-offs 55,096 3,351 8,050 12,077 23,007 101,581 Recoveries 9,758 941 1,208 736 6,630 19,273 Net charge-offs 45,338 2,410 6,842 11,341 16,377 82,308 Others (1) (17,485 ) 1 — (14,737 ) (12,442 ) (44,663 ) Balance at end of period ¥ 659,254 ¥ 56,669 ¥ 30,837 ¥ 83,902 ¥ 94,816 ¥ 925,478 Six months ended September 30, 2017: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Balance at beginning of period ¥ 900,686 ¥ 67,336 ¥ 30,165 ¥ 73,733 ¥ 110,268 ¥ 1,182,188 Provision (credit) for credit losses (207,025 ) (16,024 ) 10,669 (5,882 ) 31,694 (186,568 ) Charge-offs 55,204 2,238 11,047 9,241 26,274 104,004 Recoveries 12,376 666 695 1,547 8,372 23,656 Net charge-offs 42,828 1,572 10,352 7,694 17,902 80,348 Others (1) 1,709 — — (2,679 ) 1,879 909 Balance at end of period ¥ 652,542 49,740 ¥ 30,482 ¥ 57,478 ¥ 125,939 ¥ 916,181 Note: (1 ) Others are principally comprised of gains or losses from foreign exchange translation. Allowance for credit losses and recorded investment in loans by portfolio segment at March 31, 2017 and September 30, 2017 are shown below: At March 31, 2017: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 772,804 ¥ 46,520 ¥ 20,523 ¥ 19,174 ¥ 19,035 ¥ 878,056 Collectively evaluated for impairment 115,489 19,255 9,632 54,096 91,137 289,609 Loans acquired with deteriorated credit quality 12,393 1,561 10 463 96 14,523 Total ¥ 900,686 ¥ 67,336 ¥ 30,165 ¥ 73,733 ¥ 110,268 ¥ 1,182,188 Loans: Individually evaluated for impairment ¥ 1,349,621 ¥ 125,611 ¥ 71,879 ¥ 93,452 ¥ 65,028 ¥ 1,705,591 Collectively evaluated for impairment 87,976,946 14,197,027 510,393 8,944,409 4,891,997 116,520,772 Loans acquired with deteriorated credit quality 34,140 9,810 10,881 27,128 9,217 91,176 Total (1) ¥ 89,360,707 ¥ 14,332,448 ¥ 593,153 ¥ 9,064,989 ¥ 4,966,242 ¥ 118,317,539 At September 30, 2017: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 552,727 ¥ 26,412 ¥ 20,457 ¥ 9,957 ¥ 28,345 ¥ 637,898 Collectively evaluated for impairment 86,373 21,702 10,010 47,063 97,524 262,672 Loans acquired with deteriorated credit quality 13,442 1,626 15 458 70 15,611 Total ¥ 652,542 ¥ 49,740 ¥ 30,482 ¥ 57,478 ¥ 125,939 ¥ 916,181 Loans: Individually evaluated for impairment ¥ 1,158,691 ¥ 118,536 ¥ 69,415 ¥ 80,100 ¥ 77,829 ¥ 1,504,571 Collectively evaluated for impairment 88,514,147 14,023,212 512,595 8,703,335 5,030,513 116,783,802 Loans acquired with deteriorated credit quality 31,527 9,597 10,628 18,933 7,609 78,294 Total (1) ¥ 89,704,365 ¥ 14,151,345 ¥ 592,638 ¥ 8,802,368 ¥ 5,115,951 ¥ 118,366,667 Note: (1 ) Total loans in the above table do not include loans held for sale, and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets [Text Block]	6 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets [Text Block]	5. GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill The table below presents the movement in the carrying amount of goodwill during the six months ended September 30, 2016 and 2017: Six months ended 2016 2017 (in millions) Balance at beginning of period Goodwill ¥ 2,539,874 ¥ 2,542,280 Accumulated impairment losses (2,085,499 ) (2,092,137 ) 454,375 450,143 Goodwill recognized during the six months (1) 2,858 — Foreign currency translation adjustments and other (65,132 ) (14,590 ) Balance at end of period Goodwill 2,477,600 2,527,690 Accumulated impairment losses (2,085,499 ) (2,092,137 ) ¥ 392,101 ¥ 435,553 Note: (1 ) See Note 2 for the goodwill recognized in connection with acquisitions. Other Intangible Assets The table below presents the net carrying amount by major class of other intangible assets at March 31, 2017 and September 30, 2017: March 31, September 30, (in millions) Intangible assets subject to amortization: Software ¥ 711,190 ¥ 713,438 Core deposit intangibles 50,100 46,948 Customer relationships 191,992 171,363 Trade names 49,814 47,932 Other 8,139 10,952 Total 1,011,235 990,633 Intangible assets not subject to amortization: Other 9,124 9,122 Total ¥ 1,020,359 ¥ 999,755 The impairment losses on other intangible assets for the six months ended September 30, 2016 and 2017 were ¥968 million and ¥16,591 million, respectively, which are included in impairment of intangible assets in the accompanying condensed consolidated statements of income. The impairment loss for the six months ended September 30, 2017 included a loss of ¥11,121 million relating to the foreign subsidiary’s customer relationships under the Trust Asset Business Group segment. The intangible assets were valued based on discounted expected future cash flows. The estimated future cash flows of the above customer relationships were revised downward due to a decrease in acquired customer base. Accordingly, the MUFG group revaluated the intangible assets and recognized impairment losses.

Pledged Assets and Collateral _

Pledged Assets and Collateral [Text Block]	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Pledged Assets and Collateral [Text Block]	6. PLEDGED ASSETS AND COLLATERAL At September 30, 2017, assets mortgaged, pledged, or otherwise subject to lien were as follows: September 30, 2017 (in millions) Trading account securities ¥ 7,975,769 Investment securities 8,328,320 Loans 15,522,796 Other 61,129 Total ¥ 31,888,014 The above pledged assets were classified by type of liabilities to which they related as follows: September 30, 2017 (in millions) Deposits ¥ 316,560 Payables under repurchase agreements and securities lending transactions 12,965,112 Other short-term borrowings and long-term debt 18,569,633 Other 36,709 Total ¥ 31,888,014 At September 30, 2017, certain investment securities, principally Japanese national government and Japanese government agency bonds, loans and other assets aggregating to ¥15,913,526 million were pledged as collateral for acting as a collection agent of public funds, for settlement of exchange at the Bank of Japan and Japanese Banks’ Payment Clearing Network, for derivative transactions and for certain other purposes. The MUFG Group engages in on-balance At March 31, 2017 and September 30, 2017, the cash collateral pledged for derivative transactions, which is included in Other assets, was ¥1,663,945 million and ¥2,001,628 million, respectively, and the cash collateral received for derivative transactions, which is included in Other liabilities, was ¥1,080,929 million and ¥861,877 million, respectively.

Severance Indemnities and Pensi

Severance Indemnities and Pension Plans [Text Block]	6 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Severance Indemnities and Pension Plans [Text Block]	7. SEVERANCE INDEMNITIES AND PENSION PLANS The following table summarizes the components of net periodic benefit costs of pension benefits, severance indemnities plans (“SIPs”) and other benefits for the six months ended September 30, 2016 and 2017: Six months ended September 30, Domestic subsidiaries Foreign offices and subsidiaries 2016 2017 2016 2017 Pension benefits and SIPs Pension benefits and SIPs Pension benefits Other benefits Pension benefits Other benefits (in millions) Service cost—benefits earned during the period ¥ 24,453 ¥ 23,539 ¥ 6,701 ¥ 548 ¥ 5,646 ¥ 348 Interest cost on projected benefit obligation 6,232 7,266 8,027 717 7,651 540 Expected return on plan assets (30,126 ) (34,144 ) (15,075 ) (1,066 ) (16,069 ) (1,062 ) Amortization of net actuarial loss 8,870 3,946 9,788 669 5,740 563 Amortization of prior service cost (3,784 ) (580 ) (1,063 ) (427 ) (1,547 ) (1,391 ) Gain on settlements and curtailment (445 ) (2,019 ) — — — — Net periodic benefit cost ¥ 5,200 ¥ (1,992 ) ¥ 8,378 ¥ 441 ¥ 1,421 ¥ (1,002 ) The MUFG Group has contributed to the plan assets for the six months ended September 30, 2017 and expects to contribute for the remainder of the fiscal year ending March 31, 2018 as follows, based upon its current funded status and expected asset return assumptions: Domestic Foreign offices Pension Pension Other (in billions) For the six months ended September 30, 2017 ¥ 51.3 ¥ 14.8 ¥ 0.2 For the remainder of the fiscal year ending March 31, 2018 ¥ 23.0 ¥ 1.5 ¥ 0.2

Offsetting of Derivatives, Repu

Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Text Block]	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Text Block]	8. OFFSETTING OF DERIVATIVES, REPURCHASE AGREEMENTS, AND SECURITIES LENDING TRANSACTIONS The following tables present, as of March 31, 2017 and September 30, 2017, the gross and net amounts of derivatives, resale and repurchase agreements, and securities borrowing and lending transactions, including the related gross amounts subject to an enforceable master netting arrangement or similar agreement not offset in the condensed consolidated balance sheets. The MUFG Group primarily enters into International Swaps and Derivatives Association master netting agreements, master repurchase agreements and master securities lending agreements or similar agreements for derivative contracts, resale and repurchase agreements, and securities borrowing and lending transactions. In the event of default on or termination of any one contract, these agreements provide the contracting parties with the right to net a counterparty’s rights and obligations and to liquidate and setoff collateral against any net amount owed by the counterparty. Generally, as the MUFG Group has elected to present such amounts on a gross basis, the amounts subject to these agreements are included in “Gross amounts not offset in the condensed consolidated balance sheet” column in the tabular disclosure below. For certain transactions where a legal opinion with respect to the enforceability of netting has not been sought or obtained, the related amounts are not subject to enforceable master netting agreements and not included in “Gross amounts not offset in the condensed consolidated balance sheet” column in the tabular disclosure below. At March 31, 2017 Gross amounts of Gross amounts Net amounts Gross amounts not offset Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 18,835 ¥ — ¥ 18,835 ¥ (15,053 ) ¥ (726 ) ¥ 3,056 Receivables under resale agreements 11,044 (2,856 ) 8,188 (7,461 ) (11 ) 716 Receivables under securities borrowing transactions 11,003 — 11,003 (10,880 ) (9 ) 114 Total ¥ 40,882 ¥ (2,856 ) ¥ 38,026 ¥ (33,394 ) ¥ (746 ) ¥ 3,886 Financial liabilities: Derivative liabilities ¥ 18,562 ¥ — ¥ 18,562 ¥ (15,063 ) ¥ (1,229 ) ¥ 2,270 Payables under repurchase agreements (1) 20,549 (2,856 ) 17,693 (17,489 ) (11 ) 193 Payables under securities lending transactions 5,549 — 5,549 (5,526 ) (8 ) 15 Obligations to return securities received as collateral 3,516 — 3,516 (492 ) — 3,024 Total ¥ 48,176 ¥ (2,856 ) ¥ 45,320 ¥ (38,570 ) ¥ (1,248 ) ¥ 5,502 At September 30, 2017 Gross amounts of recognized assets/liabilities Gross amounts Net amounts Gross amounts not offset Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 16,256 ¥ — ¥ 16,256 ¥ (12,843 ) ¥ (670 ) ¥ 2,743 Receivables under resale agreements 9,676 (2,975 ) 6,701 (6,127 ) (13 ) 561 Receivables under securities borrowing transactions 9,839 — 9,839 (9,723 ) (16 ) 100 Total ¥ 35,771 ¥ (2,975 ) ¥ 32,796 ¥ (28,693 ) ¥ (699 ) ¥ 3,404 Financial liabilities: Derivative liabilities ¥ 16,273 ¥ — ¥ 16,273 ¥ (12,691 ) ¥ (1,539 ) ¥ 2,043 Payables under repurchase agreements (1) 22,057 (2,892 ) 19,165 (18,946 ) (29 ) 190 Payables under securities lending transactions 4,790 — 4,790 (4,757 ) (12 ) 21 Obligations to return securities received as collateral 2,700 — 2,700 (704 ) — 1,996 Total ¥ 45,820 ¥ (2,892 ) ¥ 42,928 ¥ (37,098 ) ¥ (1,580 ) ¥ 4,250 Note: (1 ) Payables under repurchase agreements in the above table include those under long-term repurchase agreements of ¥1,611,916 million and ¥2,046,159 million at March 31, 2017 and September 30, 2017, respectively, which are included in Long-term debt in the accompanying condensed consolidated balance sheets.

Repurchase Agreements, and Secu

Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Text Block]	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Text Block]	9. REPURCHASE AGREEMENTS, AND SECURITIES LENDING TRANSACTIONS ACCOUNTED FOR AS SECURED BORROWINGS The following tables present gross obligations for payables under repurchase agreements, payables under securities lending transactions and obligations to return securities received as collateral by remaining contractual maturity and class of collateral pledged at March 31, 2017 and September 30, 2017. Potential risks associated with these arrangements primarily relate to market and liquidity risks. To manage risks associated with market exposure, the MUFG Group generally revalues the collateral underlying its repurchase agreements and securities lending transactions on a daily basis and monitors the value of the underlying securities, consisting of primarily high-quality securities such as Japanese national government and Japanese government agency bonds, and foreign governments and official institutions bonds. In the event the market value of such securities falls below the related agreements at contract amounts plus accrued interest, the MUFG Group may be required to deposit additional collateral when appropriate. To address liquidity risks, the MUFG Group conducts stress tests to ensure the adequate level of liquidity is maintained in the event of a decline in the fair value of any collateral pledged. March 31, 2017 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 2,309 ¥ 13,455 ¥ 3,083 ¥ 1,702 ¥ 20,549 Payables under securities lending transactions 1,811 1,970 1,768 — 5,549 Obligations to return securities received as collateral 3,329 102 85 — 3,516 Total ¥ 7,449 ¥ 15,527 ¥ 4,936 ¥ 1,702 ¥ 29,614 September 30, 2017 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 2,436 ¥ 13,967 ¥ 3,320 ¥ 2,334 ¥ 22,057 Payables under securities lending transactions 1,539 1,774 1,477 — 4,790 Obligations to return securities received as collateral 2,468 43 189 — 2,700 Total ¥ 6,443 ¥ 15,784 ¥ 4,986 ¥ 2,334 ¥ 29,547 Secured borrowing by the class of collateral pledged at March 31, 2017 and September 30, 2017 was as follows: March 31, 2017 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 2,975 ¥ 5,030 ¥ 2,020 ¥ 10,025 Foreign governments and official institutions bonds 13,195 — 1,101 14,296 Corporate bonds 636 1 117 754 Residential mortgage-backed securities 3,401 — — 3,401 Other debt securities 205 — 3 208 Marketable equity securities 104 518 275 897 Others 33 — — 33 Total ¥ 20,549 ¥ 5,549 ¥ 3,516 ¥ 29,614 September 30, 2017 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 2,244 ¥ 4,014 ¥ 860 ¥ 7,118 Foreign governments and official institutions bonds 15,347 — 1,287 16,634 Corporate bonds 430 2 131 563 Residential mortgage-backed securities 3,840 — — 3,840 Other debt securities 123 — 4 127 Marketable equity securities 37 774 418 1,229 Others 36 — — 36 Total ¥ 22,057 ¥ 4,790 ¥ 2,700 ¥ 29,547

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss) [Text Block]	6 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss) [Text Block]	10. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the changes in Accumulated OCI, net of tax and net of noncontrolling interests, for the six months ended September 30, 2016 and 2017: Six months ended 2016 2017 (in millions) Accumulated other comprehensive income (loss), net of taxes: Net unrealized gains (losses) on investment securities: Balance at beginning of period ¥ 1,995,314 ¥ 2,032,807 Net change during the period (132,427 ) 253,088 Effect of adopting new guidance on consolidation of certain variable interest entities 5,509 — Balance at end of period ¥ 1,868,396 ¥ 2,285,895 Net debt valuation adjustments: Balance at beginning of period ¥ (2,080 ) ¥ (10,632 ) Net change during the period 866 (5,779 ) Balance at end of period ¥ (1,214 ) ¥ (16,411 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Balance at beginning of period ¥ 4,516 ¥ (8,729 ) Net change during the period 19,205 (626 ) Balance at end of period ¥ 23,721 ¥ (9,355 ) Defined benefit plans: Balance at beginning of period ¥ (317,422 ) ¥ (214,062 ) Net change during the period 18,291 24,604 Balance at end of period ¥ (299,131 ) ¥ (189,458 ) Foreign currency translation adjustments: Balance at beginning of period ¥ 620,931 ¥ 482,039 Net change during the period (730,374 ) (37,968 ) Effect of adopting new guidance on consolidation of certain variable interest entities (1,636 ) — Balance at end of period ¥ (111,079 ) ¥ 444,071 Balance at end of period ¥ 1,480,693 ¥ 2,514,742 The following table presents the before tax and net of tax changes in each component of Accumulated OCI for the six months ended September 30, 2016 and 2017: Six months ended September 30, 2016 2017 Before tax Tax (expense) Net of tax Before tax Tax (expense) Net of tax (in millions) Net unrealized gains (losses) on investment securities: Net unrealized gains (losses) on investment securities ¥ (71,019 ) ¥ 19,199 ¥ (51,820 ) ¥ 540,758 ¥ (169,917 ) ¥ 370,841 Reclassification adjustment for gains included in net income before attribution of noncontrolling interests (120,742 ) 38,139 (82,603 ) (175,398 ) 52,011 (123,387 ) Net change (191,761 ) 57,338 (134,423 ) 365,360 (117,906 ) 247,454 Net unrealized losses on investment securities attributable to noncontrolling interests (1,996 ) (5,634 ) Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group (132,427 ) 253,088 Net debt valuation adjustments: Net debt valuation adjustments 1,158 (364 ) 794 (8,218 ) 2,516 (5,702 ) Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests 105 (33 ) 72 (111 ) 34 (77 ) Net change 1,263 (397 ) 866 (8,329 ) 2,550 (5,779 ) Net debt valuation adjustments attributable to noncontrolling interests — — Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group 866 (5,779 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Net unrealized gains on derivatives qualifying for cash flow hedges 41,833 (16,752 ) 25,081 4,450 (1,641 ) 2,809 Reclassification adjustment for gains included in net income before attribution of noncontrolling interests (9,678 ) 3,802 (5,876 ) (5,584 ) 2,149 (3,435 ) Net change 32,155 (12,950 ) 19,205 (1,134 ) 508 (626 ) Net unrealized gains on derivatives qualifying for cash flow hedges attributable to noncontrolling interests — — Net unrealized gains (losses) on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group 19,205 (626 ) Defined benefit plans: Defined benefit plans 15,910 (6,798 ) 9,112 31,778 (10,240 ) 21,538 Reclassification adjustment for losses included in net income before attribution of noncontrolling interests 13,598 (4,340 ) 9,258 4,659 (1,588 ) 3,071 Net change 29,508 (11,138 ) 18,370 36,437 (11,828 ) 24,609 Defined benefit plans attributable to noncontrolling interests 79 5 Defined benefit plans attributable to Mitsubishi UFJ Financial Group 18,291 24,604 Foreign currency translation adjustments: Foreign currency translation adjustments (833,911 ) 72,740 (761,171 ) (35,954 ) (2,932 ) (38,886 ) Reclassification adjustment for losses included in net income before attribution of noncontrolling interests 2,641 (464 ) 2,177 2,961 — 2,961 Net change (831,270 ) 72,276 (758,994 ) (32,993 ) (2,932 ) (35,925 ) Foreign currency translation adjustments attributable to noncontrolling interests (28,620 ) 2,043 Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group (730,374 ) (37,968 ) Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group ¥ (824,439 ) ¥ 233,319 The following table presents the effect of the reclassification of significant items out of Accumulated OCI on the respective line items of the accompanying condensed consolidated statements of income for the six months ended September 30, 2016 and 2017: Six months ended 2016 2017 Details of Accumulated OCI components Amount reclassified out of Line items in the consolidated statements of income (in millions) Net unrealized losses (gains) on investment securities Net gains on sales and redemptions of Available-for-sale ¥ (153,607 ) ¥ (181,530 ) Investment securities gains—net Other 32,865 6,132 (120,742 ) (175,398 ) Total before tax 38,139 52,011 Income tax expense ¥ (82,603 ) ¥ (123,387 ) Net of tax Net debt valuation adjustments ¥ 105 ¥ (111 ) Equity in earnings of equity method investees—net 105 (111 ) Total before tax (33 ) 34 Income tax expense ¥ 72 ¥ (77 ) Net of tax Net unrealized losses (gains) on derivatives qualifying for cash flow hedges Interest rate contracts ¥ (9,642 ) ¥ (5,471 ) Interest income on Loans, including fees Other (36 ) (113 ) (9,678 ) (5,584 ) Total before tax 3,802 2,149 Income tax expense ¥ (5,876 ) ¥ (3,435 ) Net of tax Defined benefit plans Net actuarial loss (1) ¥ 19,327 ¥ 10,249 Prior service cost (1) (5,273 ) (3,518 ) Loss (gain) on settlements and curtailment, and other (1) (456 ) (2,072 ) 13,598 4,659 Total before tax (4,340 ) (1,588 ) Income tax expense ¥ 9,258 ¥ 3,071 Net of tax Foreign currency translation adjustments ¥ 2,641 ¥ 2,961 Other non-interest 2,641 2,961 Total before tax (464 ) — Income tax expense ¥ 2,177 ¥ 2,961 Net of tax Total reclassifications for the period ¥ (114,076 ) ¥ (173,473 ) Total before tax 37,104 52,606 Income tax expense ¥ (76,972 ) ¥ (120,867 ) Net of tax Note: (1 ) These Accumulated OCI components are included in the computation of net periodic benefit cost. See Note 7 for more information.

Noncontrolling Interests _Text

Noncontrolling Interests [Text Block]	6 Months Ended
	Sep. 30, 2017
Noncontrolling Interest [Abstract]
Noncontrolling Interests [Text Block]	11. NONCONTROLLING INTERESTS Changes in MUFG’s Ownership Interests in Subsidiaries The following table presents the effect on MUFG’s shareholders’ equity from changes in ownership of subsidiaries resulting from transactions with the noncontrolling interest shareholders during the six months ended September 30, 2016 and 2017: Six months ended 2016 2017 (in millions) Net income attributable to Mitsubishi UFJ Financial Group ¥ 750,883 ¥ 790,704 Transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders: Purchase of shares of Mitsubishi UFJ NICOS from noncontrolling interest shareholder (Note 2) — (34,751 ) Other — 54 Net transfers to the noncontrolling interest shareholders — (34,697 ) Change from net income attributable to Mitsubishi UFJ Financial Group and transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders ¥ 750,883 ¥ 756,007

Derivative Financial Instrument

Derivative Financial Instruments [Text Block]	6 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments [Text Block]	12. DERIVATIVE FINANCIAL INSTRUMENTS The MUFG Group uses various derivative financial instruments both for trading purposes and for purposes other than trading (primarily risk management purposes) in the normal course of business to meet the financial needs of its customers, as a source of revenue and to manage its exposures to a variety of risks. See Note 24 to the consolidated financial statements for the fiscal year ended March 31, 2017 for a further discussion of the MUFG Group’s use of derivative instruments. During the six months ended September 30, 2017, there was no change in the MUFG Group’s use of derivative instruments that had a material impact on the MUFG Group’s financial position and results of operations. Derivatives Designated as Hedges The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered by MUAH whose fiscal period ends on December 31. Cash Flow Hedges MUAH uses interest rate swaps to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on the London Interbank Offered Rate (“LIBOR”) indexed loans, and to a lesser extent, to hedge interest rate risk on rollover debt. MUAH used interest rate swaps with a notional amount of ¥1,220.8 billion at June 30, 2017 to hedge the risk of changes in cash flows attributable to changes in the designated benchmark interest rate on LIBOR indexed loans. To the extent effective, payments received or paid under the swap contract offset fluctuations in interest income on loans caused by changes in the relevant LIBOR index. MUAH used interest rate swaps with a notional amount of ¥32.5 billion at June 30, 2017 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 June 30, 2017, the weighted average remaining life of the active cash flow hedges was 4 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 (“OCI”) 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 non-interest Fair Value Hedges MUAH 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, U.S. dollar LIBOR. For fair value hedges, any ineffectiveness is recognized in non-interest Notional Amounts of Derivative Contracts The following table summarizes the notional amounts of derivative contracts at March 31, 2017 and September 30, 2017: Notional amounts (1) March 31, September 30, (in trillions) Interest rate contracts ¥ 1,252.7 ¥ 1,240.5 Foreign exchange contracts 216.9 222.6 Equity contracts 4.7 6.7 Commodity contracts 0.5 0.4 Credit derivatives 6.0 6.2 Others 4.3 4.2 Total ¥ 1,485.1 ¥ 1,480.6 Note: (1) Includes both written and purchased positions. Impact of Derivatives on the Condensed Consolidated Balance Sheets The following table summarizes fair value information on derivative instruments that are recorded on the MUFG Group’s condensed consolidated balance sheets at March 31, 2017 and September 30, 2017: Fair value of derivative instruments March 31, 2017 (1)(5) September 30, 2017 (1)(5) Not designated (2) Designated (3) Total (4) Not designated (2) Designated (3) Total (4) (in billions) Derivative assets: Interest rate contracts ¥ 14,240 ¥ 2 ¥ 14,242 ¥ 12,210 ¥ 1 ¥ 12,211 Foreign exchange contracts 4,301 — 4,301 3,742 — 3,742 Equity contracts 188 — 188 206 — 206 Commodity contracts 35 — 35 29 — 29 Credit derivatives 67 — 67 67 — 67 Others 2 — 2 1 — 1 Total derivative assets ¥ 18,833 ¥ 2 ¥ 18,835 ¥ 16,255 ¥ 1 ¥ 16,256 Derivative liabilities: Interest rate contracts ¥ 14,305 ¥ 23 ¥ 14,328 ¥ 12,245 ¥ 20 ¥ 12,265 Foreign exchange contracts 4,084 — 4,084 3,752 — 3,752 Equity contracts 182 — 182 253 — 253 Commodity contracts 31 — 31 27 — 27 Credit derivatives 58 — 58 68 — 68 Others (6) (121 ) — (121 ) (92 ) — (92 ) Total derivative liabilities ¥ 18,539 ¥ 23 ¥ 18,562 ¥ 16,253 ¥ 20 ¥ 16,273 Notes: (1) The fair value of derivative instruments is presented on a gross basis even when derivative instruments are subject to master netting agreements. Cash collateral payable and receivable associated with derivative instruments are not added to or netted against the fair value amounts. (2) The derivative instruments which are not designated as a hedging instrument are held for trading and risk management purposes, and are presented in Trading account assets/liabilities except for (6). (3) The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered into by MUAH. The derivative instruments which are designated as hedging instruments are presented in Other assets or Other liabilities on the accompanying condensed consolidated balance sheets. (4) This table does not include contracts with embedded derivatives for which the fair value option has been elected. (5) For more information about fair value measurement and assumptions used to measure the fair value of derivatives, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. (6) Others include mainly bifurcated embedded derivatives carried at fair value, which are presented in Deposits and Long-term debt. Impact of Derivatives and Hedged Items on the Condensed Consolidated Statements of Income and Accumulated OCI The following tables provide more detailed information regarding the derivative-related impact on the accompanying condensed consolidated statements of income and Accumulated OCI by accounting designation for the six months ended September 30, 2016 and 2017: Gains and losses for trading and risk management derivatives (not designated as hedging instruments) Trading and risk management derivatives gains and losses Foreign exchange Trading account Total (in billions) Six months ended September 30, 2016: Interest rate contracts ¥ — ¥ 67 ¥ 67 Foreign exchange contracts 179 — 179 Equity contracts — (20 ) (20 ) Commodity contracts — 1 1 Credit derivatives — 13 13 Others 2 (20 ) (18 ) Total ¥ 181 ¥ 41 ¥ 222 Six months ended September 30, 2017: Interest rate contracts ¥ — ¥ (8 ) ¥ (8 ) Foreign exchange contracts (158 ) — (158 ) Equity contracts — (146 ) (146 ) Commodity contracts — — — Credit derivatives — (1 ) (1 ) Others (1 ) (38 ) (39 ) Total ¥ (159 ) ¥ (193 ) ¥ (352 ) Gains and losses for derivatives designated as cash flow hedges Six months ended September 30, 2016 2017 (in billions) Gains recognized in Accumulated OCI on derivative instruments (Effective portion) Interest rate contracts ¥ 46 ¥ 4 Total ¥ 46 ¥ 4 Gains reclassified from Accumulated OCI into income (Effective portion) Interest rate contracts (1) ¥ 10 ¥ 6 Total ¥ 10 ¥ 6 Note: (1) Included in Interest income. Embedded Derivatives Features embedded in other non-derivative Credit Derivatives The MUFG Group enters into credit derivatives to manage its credit risk exposure, to facilitate client transactions, and for proprietary trading purposes, under which they provide the counterparty protection against the risk of default on a set of debt obligations issued by a specified reference entity or entities. See Note 24 to the consolidated financial statements for the fiscal year ended March 31, 2017 for a more detailed explanation and discussion of credit derivatives. The table below summarizes certain information regarding protection sold through credit derivatives as of March 31, 2017 and September 30, 2017: Protection sold Maximum potential/Notional amount Fair value At March 31, 2017: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 627,355 ¥ 949,129 ¥ 29,493 ¥ 1,605,977 ¥ (21,005 ) Non-investment 107,663 349,886 6,580 464,129 1,654 Not rated 5,973 5,981 — 11,954 (516 ) Total 740,991 1,304,996 36,073 2,082,060 (19,867 ) Index and basket credit default swaps held by BTMU: Investment grade (2) 7,000 198,335 63,767 269,102 (4,145 ) Non-investment 17,000 52,145 21,316 90,461 (837 ) Total 24,000 250,480 85,083 359,563 (4,982 ) Index and basket credit default swaps held by MUSHD: Investment grade (2) 14,000 72,192 1,000 87,192 (1,278 ) Non-investment 21,000 73,000 — 94,000 (1,725 ) Not rated 16,228 194,533 — 210,761 (11,734 ) Total 51,228 339,725 1,000 391,953 (14,737 ) Total index and basket credit default swaps sold 75,228 590,205 86,083 751,516 (19,719 ) Total credit default swaps sold 816,219 1,895,201 122,156 2,833,576 (39,586 ) Other credit derivatives sold (3) Investment grade — 78,553 — 78,553 — Total credit derivatives ¥ 816,219 ¥ 1,973,754 ¥ 122,156 ¥ 2,912,129 ¥ (39,586 ) Protection sold Maximum potential/Notional amount by Fair value At September 30, 2017: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 542,236 ¥ 995,380 ¥ 65,303 ¥ 1,602,919 ¥ (26,542 ) Non-investment 151,212 303,399 6,790 461,401 (2,283 ) Not rated 2,245 3,937 — 6,182 (262 ) Total 695,693 1,302,716 72,093 2,070,502 (29,087 ) Index and basket credit default swaps held by BTMU: Investment grade (2) 18,000 81,624 104,041 203,665 (4,191 ) Non-investment 3,000 63,129 10,146 76,275 (978 ) Total 21,000 144,753 114,187 279,940 (5,169 ) Index and basket credit default swaps held by MUSHD: Investment grade (2) 21,000 106,763 23,500 151,263 (3,146 ) Non-investment 15,000 45,000 — 60,000 (1,206 ) Not rated 31,135 239,376 897 271,408 (16,300 ) Total 67,135 391,139 24,397 482,671 (20,652 ) Total index and basket credit default swaps sold 88,135 535,892 138,584 762,611 (25,821 ) Total credit default swaps sold 783,828 1,838,608 210,677 2,833,113 (54,908 ) Other credit derivatives sold (3) Investment grade — 78,911 — 78,911 5 Total credit derivatives ¥ 783,828 ¥ 1,917,519 ¥ 210,677 ¥ 2,912,024 ¥ (54,903 ) Notes: (1) Fair value amounts are shown on a gross basis prior to cash collateral or counterparty netting. (2) The MUFG Group considers ratings of Baa3/BBB- (3) Other credit derivatives primarily consist of total return swaps. The MUFG Group may economically hedge its exposure to credit derivatives by entering into offsetting derivative contracts. The carrying value and notional amounts of credit protection sold in which the MUFG Group held purchased protection with identical underlying referenced entities were approximately ¥33 billion and ¥2,327 billion, respectively, at March 31, 2017, and approximately ¥46 billion and ¥2,337 billion, respectively, at September 30, 2017. Collateral is held by the MUFG Group in relation to these instruments. Collateral requirements are determined at the counterparty level and cover numerous transactions and products as opposed to individual contracts. Credit Risk, Liquidity Risk and Credit-risk-related Contingent Features Certain of the MUFG Group’s derivative instruments contain provisions that require the MUFG Group’s debt to maintain an investment grade credit rating from each of the major credit rating agencies. If the MUFG Group’s debt were to fall below investment grade, it would be in violation of these provisions, and the counterparties to the derivative instruments could request payments on early termination or demand immediate and ongoing full overnight collateralization on derivative instruments in net liability positions. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position at March 31, 2017 and September 30, 2017 was approximately ¥1.0 trillion and ¥0.9 trillion, respectively, for which the MUFG Group has posted collateral of approximately ¥251 billion and ¥224 billion, respectively, in the normal course of business. The amount of additional collateral and early termination amount which could be requested if the MUFG Group’s debt falls below investment grade was ¥81 billion and ¥79 billion, respectively, as of March 31, 2017 and ¥68 billion and ¥76 billion, respectively, as of September 30, 2017.

Obligations under Guarantees an

Obligations under Guarantees and Other Off-balance Sheet Instruments [Text Block]	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Obligations under Guarantees and Other Off-balance Sheet Instruments [Text Block]	13. OBLIGATIONS UNDER GUARANTEES AND OTHER OFF-BALANCE Obligations under Guarantees The MUFG Group provides customers with a variety of guarantees and similar arrangements as described in Note 25 to the consolidated financial statements for the fiscal year ended March 31, 2017. The table below presents the contractual or notional amounts of such guarantees at March 31, 2017 and September 30, 2017: March 31, September 30, (in billions) Standby letters of credit and financial guarantees ¥ 3,775 ¥ 3,878 Performance guarantees 2,968 3,079 Derivative instruments (1)(2) 44,249 43,752 Liabilities of trust accounts 9,561 9,253 Others 5 — Total ¥ 60,558 ¥ 59,962 Notes: (1) Credit derivatives sold by the MUFG Group are excluded from this presentation. (2) Derivative instruments that are deemed to be included within the definition of guarantees as prescribed in the guidance on guarantees include certain written options and credit default swaps. Performance Risk The MUFG Group monitors performance risk of its guarantees using the same credit rating system utilized for estimating probabilities of default with its loan portfolio. The MUFG Group’s credit rating system is consistent with both the method of evaluating credit risk under Basel III and those of third-party credit rating agencies. On certain underlying referenced credits or entities, ratings are not available. Such referenced credits are included in the “Not rated” category in the following tables. Presented in the tables below is the maximum potential amount of future payments classified based upon internal credit ratings as of March 31, 2017 and September 30, 2017. The determination of the maximum potential future payments is based on the notional amount of the guarantees without consideration of possible recoveries under recourse provisions or from collateral held or pledged. Such amounts do not represent the anticipated losses, if any, on these guarantees. At March 31, 2017: Maximum Amount by borrower grade Normal Close (1) Likely to (2) Not rated (in billions) Standby letters of credit and financial guarantees ¥ 3,775 ¥ 3,629 ¥ 119 ¥ 24 ¥ 3 Performance guarantees 2,968 2,831 96 11 30 Total ¥ 6,743 ¥ 6,460 ¥ 215 ¥ 35 ¥ 33 At September 30, 2017: Maximum Amount by borrower grade Normal Close (1) Likely to (2) Not rated (in billions) Standby letters of credit and financial guarantees ¥ 3,878 ¥ 3,771 ¥ 86 ¥ 19 ¥ 2 Performance guarantees 3,079 2,891 131 32 25 Total ¥ 6,957 ¥ 6,662 ¥ 217 ¥ 51 ¥ 27 Notes: (1 ) Borrowers classified as Close Watch represent those that require close monitoring as the borrower has begun to exhibit elements of potential concern with respect to its business performance and financial condition, the borrower has begun to exhibit elements of serious concern with respect to its business performance and financial condition, including business problems requiring long-term solutions, or the borrower’s loans are TDRs or loans contractually past due 90 days or more for special reasons. (2 ) Borrowers classified as Likely to become Bankrupt or Legally/Virtually Bankrupt represent those that have a higher probability of default than those categorized as Close Watch due to serious debt repayment problems with poor progress in achieving restructuring plans, the borrower being considered virtually bankrupt with no prospects for an improvement in business operations, or the borrower being legally bankrupt with no prospects for continued business operations because of non-payment, The guarantees the MUFG Group does not classify based upon internal credit ratings are described in Note 25 to the consolidated financial statements for the fiscal year ended March 31, 2017. Other Off-balance In addition to obligations under guarantees and similar arrangements set forth above, the MUFG Group issues other off-balance March 31, September 30, (in billions) Commitments to extend credit ¥ 84,334 ¥ 81,788 Commercial letters of credit 1,214 1,282 Commitments to make investments 135 143 Other 13 13

Contingent Liabilities _Text Bl

Contingent Liabilities [Text Block]	6 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities [Text Block]	14. CONTINGENT LIABILITIES Repayment of Excess Interest The Japanese government implemented regulatory reforms affecting the consumer lending industry. In December 2006, the Diet passed legislation to reduce the maximum permissible interest rate under the Act Regulating the Receipt of Contributions, the Receipt of Deposits, and Interest Rates from 29.2% per annum to 20% per annum. The reduction in interest rates was implemented in June 2010. The regulatory reforms also included amendments to the Money Lending Business Act which, effective June 18, 2010, abolished the so-called Under the regulatory reforms, all interest rates for loans originated after this reform are subject to the lower limits imposed by the Interest Rate Restriction Act. Furthermore, the new regulations require stringent review procedures for consumer finance companies before lending, and with the exception of certain provisions, one of those new regulations introduces a limit on aggregate credit extensions to one-third Formerly, consumer finance companies were able to charge interest rates exceeding the limits stipulated by the Interest Rate Restriction Act so long as the payment was made voluntarily by the borrowers, and the lender complied with various notice and other requirements. Accordingly, MUFG’s consumer finance subsidiaries and equity method investees offered loans at interest rates above the Interest Rate Restriction Act. Upon the implementation of the regulatory reforms in June 2010, they lowered the interest rates for loans originated after this reform to below the Interest Rate Restriction Act. In 2006, the Supreme Court of Japan passed decisions in a manner more favorable to borrowers requiring reimbursement of previously paid interest exceeding the limits stipulated by the Interest Rate Restriction Act in certain circumstances. Borrowers’ claims for reimbursement of excess interest arose after such decisions and other regulatory changes. The MUFG Group maintains an allowance for repayment of excess interest based on an analysis of past experience of reimbursement of excess interest, borrowers’ profile, recent trend of borrowers’ claims for reimbursement, and management future forecasts. Management believes that the provision for repayment of excess interest is adequate and the allowance is at the appropriate amount to absorb probable losses, so that the impact of future claims for reimbursement of excess interest will not have a material adverse effect on the MUFG Group’s financial position and results of operations. The allowance for repayment of excess interest established by MUFG’s consumer finance subsidiaries, which was included in Other liabilities, was ¥39,414 million and ¥30,857 million as of March 31, 2017 and September 30, 2017, respectively. Provision (reversal) related to the allowance for the six months ended September 30, 2016 and 2017 were not material. Litigation In the ordinary course of business, the MUFG Group is subject to various litigation and regulatory matters. In accordance with applicable accounting guidance, the MUFG Group establishes an accrued liability for loss contingencies arising from litigation and regulatory matters when they are determined to be probable in their occurrence and the probable loss amount can be reasonably estimated. Based upon current knowledge and consultation with counsel, management believes the eventual outcome of such litigation and regulatory matters, where losses are probable and the probable loss amounts can be reasonably estimated, would not have a material adverse effect on the MUFG Group’s financial position, results of operations or cash flows. Additionally, management believes the amount of loss that is reasonably possible, but not probable, from various litigation and regulatory matters is not material to the MUFG Group’s financial position, results of operations or cash flows.

Variable Interest Entities _Tex

Variable Interest Entities [Text Block]	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Variable Interest Entities [Text Block]	15. VARIABLE INTEREST ENTITIES In the normal course of business, the MUFG Group has financial interests and other contractual obligations in various entities which may be deemed to be VIEs such as asset-backed conduits, various investment funds, special purpose entities created for structured financing, repackaged instruments, entities created for the securitization of the MUFG Group’s assets, and trust arrangements. See Note 26 to the consolidated financial statements for the fiscal year ended March 31, 2017 for further information about the MUFG Group’s involvements with VIEs. The following tables present the assets and liabilities of consolidated VIEs recorded on the accompanying condensed consolidated balance sheets at March 31, 2017 and September 30, 2017: Consolidated VIEs Consolidated assets At March 31, 2017: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 7,332,485 ¥ 48,688 ¥ 34,690 ¥ 23,423 ¥ 1,485,377 ¥ 5,733,202 ¥ 7,105 Investment funds 712,694 — 9,020 511,924 15,611 — 176,139 Special purpose entities created for structured financing 226,380 — 2,310 — — 172,008 52,062 Repackaged instruments 77,211 — — 20,783 56,428 — — Securitization of the MUFG Group’s assets (1) 6,798,561 — — — — 6,775,344 23,217 Trust arrangements 6,749,808 — 7,681 593 149,205 6,578,701 13,628 Others 65,883 350 30,853 — 52 16,905 17,723 Total consolidated assets before elimination 21,963,022 49,038 84,554 556,723 1,706,673 19,276,160 289,874 The amounts eliminated in consolidation (6,789,161 ) (48,852 ) (72,506 ) (16,914 ) (69,086 ) (6,562,970 ) (18,833 ) Total consolidated assets ¥ 15,173,861 ¥ 186 ¥ 12,048 ¥ 539,809 ¥ 1,637,587 ¥ 12,713,190 ¥ 271,041 Consolidated liabilities Total Deposits Other Long-term All other (in millions) Asset-backed conduits ¥ 7,357,874 ¥ — ¥ 5,397,811 ¥ 1,379,498 ¥ 580,565 Investment funds 2,882 — — — 2,882 Special purpose entities created for structured financing 135,667 — 573 128,804 6,290 Repackaged instruments 76,713 — 4,000 72,096 617 Securitization of the MUFG Group’s assets (1) 6,768,108 — 29,637 6,734,855 3,616 Trust arrangements 6,743,464 6,676,198 — — 67,266 Others 65,031 — 45,450 1,834 17,747 Total consolidated liabilities before elimination 21,149,739 6,676,198 5,477,471 8,317,087 678,983 The amounts eliminated in consolidation (10,843,144 ) — (3,034,973 ) (7,766,722 ) (41,449 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,687,133 ) (6,676,198 ) (2,420,454 ) (2,394 ) (588,087 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 619,462 ¥ — ¥ 22,044 ¥ 547,971 ¥ 49,447 Consolidated VIEs Consolidated assets At September 30, 2017: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 7,409,619 ¥ 30,602 ¥ 21,099 ¥ 7,251 ¥ 1,600,634 ¥ 5,742,584 ¥ 7,449 Investment funds 804,668 — 6,521 557,165 13,512 — 227,470 Special purpose entities created for structured financing 210,698 — 1,964 — — 159,922 48,812 Repackaged instruments 112,879 — — 16,638 96,241 — — Securitization of the MUFG Group’s assets (1) 11,335,610 — — — — 11,310,184 25,426 Trust arrangements 6,604,632 — 8,381 317 153,134 6,423,380 19,420 Others 51,047 351 19,036 — 42 14,891 16,727 Total consolidated assets before elimination 26,529,153 30,953 57,001 581,371 1,863,563 23,650,961 345,304 The amounts eliminated in consolidation (6,584,806 ) (30,762 ) (39,774 ) (6,161 ) (79,385 ) (6,407,979 ) (20,745 ) Total consolidated assets ¥ 19,944,347 ¥ 191 ¥ 17,227 ¥ 575,210 ¥ 1,784,178 ¥ 17,242,982 ¥ 324,559 Consolidated liabilities Total Deposits Other Long-term All other (in millions) Asset-backed conduits ¥ 7,424,800 ¥ — ¥ 5,304,961 ¥ 1,477,059 ¥ 642,780 Investment funds 55,828 — — — 55,828 Special purpose entities created for structured financing 125,498 — 314 121,152 4,032 Repackaged instruments 111,951 — 13,194 94,531 4,226 Securitization of the MUFG Group’s assets (1) 11,302,407 — 29,849 11,266,685 5,873 Trust arrangements 6,597,674 6,520,112 — — 77,562 Others 50,008 — 31,514 1,736 16,758 Total consolidated liabilities before elimination 25,668,166 6,520,112 5,379,832 12,961,163 807,059 The amounts eliminated in consolidation (15,403,314 ) — (2,976,786 ) (12,374,752 ) (51,776 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,523,327 ) (6,520,112 ) (2,363,352 ) (585 ) (639,278 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 741,525 ¥ — ¥ 39,694 ¥ 585,826 ¥ 116,005 Note: (1 ) Securitization of the MUFG Group’s assets includes ¥5,793,956 million and ¥10,387,311 million of assets primarily consisting of loans and the same amounts of liabilities primarily consisting of long-term debt relating to eligible beneficiary interests in housing loan trusts as of March 31, 2017 and September 30, 2017, respectively. For more information, see analysis of each transaction category in Note 26 to the consolidated financial statements for the fiscal year ended March 31, 2017. In general, the creditors or beneficial interest holders of consolidated VIEs have recourse only to the assets of those VIEs of which they are creditors or beneficial interest holders, and do not have recourse to other assets of the MUFG Group, except where the MUFG Group is also contractually required to provide credit enhancement or program-wide liquidity. The following tables present the total assets of non-consolidated non-consolidated non-consolidated Non-consolidated On-balance On-balance sheet At March 31, 2017: Total assets Maximum Total Trading Investment Loans All other Total All other (in millions) Asset-backed conduits ¥ 29,604,929 ¥ 5,608,909 ¥ 4,383,707 ¥ 1,072 ¥ 1,236,094 ¥ 3,146,541 ¥ — ¥ 1 ¥ 1 Investment funds 30,591,880 1,674,567 1,396,830 200,651 829,641 356,828 9,710 98 98 Special purpose entities created for structured financing 40,710,546 4,717,235 3,699,415 279,471 147,543 3,207,369 65,032 4,657 4,657 Repackaged instruments 10,127,497 2,269,149 2,104,697 581,912 1,203,181 294,703 24,901 — — Others 52,012,087 3,731,571 2,723,625 98,289 83,629 2,462,462 79,245 18,539 18,539 Total ¥ 163,046,939 ¥ 18,001,431 ¥ 14,308,274 ¥ 1,161,395 ¥ 3,500,088 ¥ 9,467,903 ¥ 178,888 ¥ 23,295 ¥ 23,295 Non-consolidated VIEs On-balance On-balance sheet At September 30, 2017: Total assets Maximum Total Trading Investment Loans All other Total All other (in millions) Asset-backed conduits ¥ 29,441,674 ¥ 5,828,075 ¥ 4,605,800 ¥ 1,053 ¥ 1,391,427 ¥ 3,213,320 ¥ — ¥ 1 ¥ 1 Investment funds 36,442,349 1,588,251 1,410,293 297,533 723,493 381,111 8,156 206 206 Special purpose entities created for structured financing 41,923,186 4,637,770 3,643,692 335,081 150,068 3,110,595 47,948 6,581 6,581 Repackaged instruments 8,964,605 2,173,225 2,094,314 844,913 973,966 251,656 23,779 — — Others 60,417,928 3,900,145 2,815,983 122,003 62,180 2,557,884 73,916 18,998 18,998 Total ¥ 177,189,742 ¥ 18,127,466 ¥ 14,570,082 ¥ 1,600,583 ¥ 3,301,134 ¥ 9,514,566 ¥ 153,799 ¥ 25,786 ¥ 25,786 Maximum exposure to loss on each type of entity is determined based on the carrying amount of any on-balance off-balance on-balance

Business Segments _Text Block_

Business Segments [Text Block]	6 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Business Segments [Text Block]	16. BUSINESS SEGMENTS The business segment information, set forth below, is derived from the internal management reporting system used by management to measure the performance of the MUFG Group’s business segments. In addition, the business segment information is primarily based on the financial information prepared in accordance with accounting principles generally accepted in Japan as adjusted in accordance with internal management accounting rules and practices. Accordingly, the format and information are not consistent with the accompanying condensed consolidated financial statements prepared on the basis of U.S. GAAP. A reconciliation is provided for the total amounts of segments’ operating profit with income before income tax expense under U.S. GAAP. The following is a brief explanation of the MUFG Group’s business segments: Retail Banking Business Group one-stop, Corporate Banking Business Group Global Business Group Trust Assets Business Group Global Markets Business Group Other Management does not use information on segments’ total assets to allocate resources and assess performance. Accordingly, business segment information on total assets is not presented. The MUFG Group made modifications to refine the definition of the overseas Japanese corporate business, effective October 1, 2016, and made additional modifications for similar purposes, effective April 1, 2017. These modifications had the impact of increasing the operating profit of the Corporate Banking Business Group for the six months ended September 30, 2016 by ¥8.4 billion. The MUFG Group also made modifications to the MUFG Group’s internal management accounting rules and practices to clarify the responsibility for profits of each business segment, effective October 1, 2016, and made additional modifications for similar purposes, effective April 1, 2017. These modifications had the following impact for the six months ended September 30, 2016: • increasing the operating profits of Retail Banking Business Group and Other by ¥0.2 billion and ¥10.4 billion, respectively; and • reducing the operating profits of the Corporate Banking Business Group, the Global Business Group and the Global Markets Business Group by ¥4.0 billion, ¥0.9 billion and ¥9.4 billion, respectively. Prior period business segment information has been restated to enable comparison between the relevant amounts for the six months ended September 30, 2016 and 2017. Customer Business Retail Corporate (1) Global (1) Trust Total (1) Global Other Total (in billions) Six months ended September 30, 2016: Net revenue: ¥ 584.0 ¥ 495.6 ¥ 578.1 ¥ 82.6 ¥ 1,661.6 ¥ 348.4 ¥ 5.2 ¥ 2,015.2 BTMU and MUTB: 243.0 403.6 200.7 35.1 836.2 256.9 71.6 1,164.7 Net interest income 168.2 162.9 92.2 — 404.9 93.1 127.7 625.7 Net fees 71.5 196.2 87.0 35.1 376.1 (2.6 ) (44.8 ) 328.7 Other 3.3 44.5 21.5 — 55.2 166.4 (11.3 ) 210.3 Other than BTMU and MUTB (2) 341.0 92.0 377.4 47.5 825.4 91.5 (66.4 ) 850.5 Operating expenses 479.7 282.8 372.3 52.9 1,118.7 101.3 79.0 1,299.0 Operating profit (loss) ¥ 104.3 ¥ 212.8 ¥ 205.8 ¥ 29.7 ¥ 542.9 ¥ 247.1 ¥ (73.8 ) ¥ 716.2 Six months ended September 30, 2017: Net revenue: ¥ 599.8 ¥ 480.4 ¥ 633.6 ¥ 91.3 ¥ 1,712.3 ¥ 319.8 ¥ 28.3 ¥ 2,060.4 BTMU and MUTB: 233.5 390.7 219.8 41.9 827.3 223.9 58.4 1,109.6 Net interest income 165.9 162.4 112.3 — 411.0 68.5 112.9 592.4 Net fees 64.9 187.0 86.8 41.9 366.2 (9.5 ) (38.6 ) 318.1 Other 2.7 41.3 20.7 — 50.1 164.9 (15.9 ) 199.1 Other than BTMU and MUTB (2) 366.3 89.7 413.8 49.4 885.0 95.9 (30.1 ) 950.8 Operating expenses 474.9 290.2 426.7 57.5 1,172.9 112.6 86.1 1,371.6 Operating profit (loss) ¥ 124.9 ¥ 190.2 ¥ 206.9 ¥ 33.8 ¥ 539.4 ¥ 207.2 ¥ (57.8 ) ¥ 688.8 Notes: (1) Net revenue, operating expenses, and operating profit relating to the overseas Japanese Corporate business were ¥78.7 billion, ¥69.0 billion, and ¥9.7 billion for the six months ended September 30, 2016, and ¥92.8 billion, ¥76.4 billion, and ¥16.4 billion for the six months ended September 30, 2017, respectively. To eliminate the double-counting of these amounts, adjustments have been made to the Total of Customer Business. These amounts have been restated in accordance with the modifications resulting in the restatement of the prior period business segment information. (2) Includes MUFG and its subsidiaries other than BTMU on a stand-alone basis and MUTB on a stand-alone basis. Reconciliation As set forth above, the measurement basis and the income and expense items of the internal management reporting system are different from the accompanying condensed consolidated statements of income. Therefore, it is impracticable to present reconciliations of all of the business segments’ information, other than operating profit, to corresponding items in the accompanying condensed consolidated statements of income. A reconciliation of operating profit under the internal management reporting system for the six months ended September 30, 2016 and 2017 above to income before income tax expense shown in the accompanying condensed consolidated statements of income is as follows: Six months ended 2016 2017 (in billions) Operating profit ¥ 716 ¥ 689 Credit for credit losses 59 187 Foreign exchange gains—net 1 23 Trading account profits (losses)—net 105 (50 ) Equity investment securities gains—net 73 95 Debt investment securities losses—net (36 ) (5 ) Equity in earnings of equity method investees—net 128 89 Other—net (40 ) (14 ) Income before income tax expense ¥ 1,006 ¥ 1,014

Fair Value _Text Block_

Fair Value [Text Block]	6 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value [Text Block]	17. FAIR VALUE For a discussion and explanation of the MUFG Group’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. During the six months ended September 30, 2017, there were no changes to the MUFG Group’s valuation methodologies that had a material impact on the MUFG Group’s financial position and results of operations. Assets and Liabilities Measured at Fair Value on a Recurring Basis The following tables present the financial instruments carried at fair value by level within the fair value hierarchy as of March 31, 2017 and September 30, 2017: At March 31, 2017 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 10,646,728 ¥ 11,027,560 ¥ 799,493 ¥ 22,473,781 Debt securities Japanese national government and Japanese government agency bonds 1,794,233 390,147 — 2,184,380 Japanese prefectural and municipal bonds — 136,226 — 136,226 Foreign governments and official institutions bonds 7,764,734 466,151 1,836 8,232,721 Corporate bonds — 3,305,520 25,521 3,331,041 Residential mortgage-backed securities — 4,816,323 47,914 4,864,237 Asset-backed securities — 280,502 654,814 935,316 Other debt securities — 5,155 35,552 40,707 Commercial paper — 1,084,421 — 1,084,421 Equity securities (2) 1,087,761 543,115 33,856 1,664,732 Trading derivative assets 112,687 18,619,331 101,100 18,833,118 Interest rate contracts 27,321 14,174,526 38,188 14,240,035 Foreign exchange contracts 9,661 4,270,548 20,455 4,300,664 Equity contracts 75,545 88,154 24,707 188,406 Commodity contracts 160 18,740 17,745 36,645 Credit derivatives — 67,363 5 67,368 Investment securities: Available-for-sale 30,214,302 8,538,271 337,526 39,090,099 Debt securities Japanese national government and Japanese government agency bonds 23,053,677 2,772,611 — 25,826,288 Japanese prefectural and municipal bonds — 1,015,489 — 1,015,489 Foreign governments and official institutions bonds 1,360,060 769,770 20,099 2,149,929 Corporate bonds — 1,104,800 36,932 1,141,732 Residential mortgage-backed securities — 1,188,903 15 1,188,918 Commercial mortgage-backed securities — 77,297 2,971 80,268 Asset-backed securities — 1,261,353 116,919 1,378,272 Other debt securities — 10,199 160,590 170,789 Marketable equity securities 5,800,565 337,849 — 6,138,414 Other investment securities — — 26,292 26,292 Others (3)(4) 453,214 37,942 3,850 495,006 Total ¥ 41,426,931 ¥ 38,223,104 ¥ 1,268,261 ¥ 80,918,296 Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 128,292 ¥ 1,392 ¥ — ¥ 129,684 Trading derivative liabilities 135,342 18,461,252 63,855 18,660,449 Interest rate contracts 45,539 14,249,439 9,637 14,304,615 Foreign exchange contracts 5,219 4,072,787 5,597 4,083,603 Equity contracts 84,514 66,482 31,019 182,015 Commodity contracts 70 14,730 17,375 32,175 Credit derivatives — 57,814 227 58,041 Obligation to return securities received as collateral 3,423,936 92,296 — 3,516,232 Others (5) — 376,724 28,432 405,156 Total ¥ 3,687,570 ¥ 18,931,664 ¥ 92,287 ¥ 22,711,521 At September 30, 2017 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 12,437,573 ¥ 11,698,694 ¥ 981,130 ¥ 25,117,397 Debt securities Japanese national government and Japanese government agency bonds 1,681,251 470,475 1,075 2,152,801 Japanese prefectural and municipal bonds — 104,280 — 104,280 Foreign governments and official institutions bonds 9,292,742 468,019 900 9,761,661 Corporate bonds — 3,274,382 33,551 3,307,933 Residential mortgage-backed securities — 5,282,911 46,214 5,329,125 Asset-backed securities — 399,664 826,699 1,226,363 Other debt securities — — 35,630 35,630 Commercial paper — 1,093,750 — 1,093,750 Equity securities (2) 1,463,580 605,213 37,061 2,105,854 Trading derivative assets 93,551 16,065,597 96,258 16,255,406 Interest rate contracts 9,912 12,165,012 34,608 12,209,532 Foreign exchange contracts 1,813 3,723,066 16,944 3,741,823 Equity contracts 81,788 98,783 26,027 206,598 Commodity contracts 38 12,084 18,679 30,801 Credit derivatives — 66,652 — 66,652 Investment securities: Available-for-sale 27,150,763 9,356,429 320,338 36,827,530 Debt securities Japanese national government and Japanese government agency bonds 19,530,854 2,977,769 — 22,508,623 Japanese prefectural and municipal bonds — 1,250,611 — 1,250,611 Foreign governments and official institutions bonds 1,562,500 719,042 20,109 2,301,651 Corporate bonds — 1,106,288 6,778 1,113,066 Residential mortgage-backed securities — 1,460,064 15 1,460,079 Commercial mortgage-backed securities — 79,986 2,884 82,870 Asset-backed securities — 1,368,242 137,411 1,505,653 Other debt securities — 9,945 153,141 163,086 Marketable equity securities 6,057,409 384,482 — 6,441,891 Other investment securities — — 25,564 25,564 Others (3)(4) 791,644 46,059 6,728 844,431 Total ¥ 40,473,531 ¥ 37,166,779 ¥ 1,430,018 ¥ 79,070,328 Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 71,580 ¥ 1,166 ¥ — ¥ 72,746 Trading derivative liabilities 160,783 16,118,563 66,692 16,346,038 Interest rate contracts 19,542 12,210,073 15,681 12,245,296 Foreign exchange contracts 1,265 3,745,399 5,553 3,752,217 Equity contracts 139,975 86,514 26,888 253,377 Commodity contracts 1 9,268 18,356 27,625 Credit derivatives — 67,309 214 67,523 Obligation to return securities received as collateral 2,593,258 106,654 — 2,699,912 Others (5) — 480,968 31,615 512,583 Total ¥ 2,825,621 ¥ 16,707,351 ¥ 98,307 ¥ 19,631,279 Notes: (1) Includes securities measured under the fair value option. (2) Excludes certain investments valued at net asset value of private equity funds, whose fair values at March 31, 2017 were ¥13,150 million, and those at September 30, 2017 were ¥17,308 million, respectively. The amounts of unfunded commitments related to these private equity funds at March 31, 2017 were ¥27,735 million, and those at September 30, 2017 were ¥44,670 million, respectively. For the nature and details of private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. (3) Mainly comprises securities received as collateral that may be sold or repledged under securities lending transactions, money in trust for segregating cash deposited by customers on security transactions and derivative assets designated as hedging instruments. (4) Excludes certain investments valued at net asset value of real estate funds and private equity funds, whose fair values at March 31, 2017 were ¥41 million, and ¥119 million, respectively, and those at September 30, 2017 were nil, and ¥149 million, respectively. For the nature and details of real estate funds and private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. (5) Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments. Transfers Between Level 1 and Level 2 During the six months ended September 30, 2016 and 2017, the transfers between Level 1 and Level 2 were as follows: Six months ended September 30, 2016 2017 Transfers out of (1) Transfers out of (1) Transfers out of (1) Transfers out of (1) (in millions) Assets Investment securities: Available-for-sale Marketable equity securities ¥ 20,689 ¥ 4,578 ¥ 1,981 ¥ 3,839 Note: (1) All transfers between Level 1 and Level 2 were assumed to have occurred at the beginning of the period. In general, the transfers from Level 1 into Level 2 comprised of securities whose fair values were measured at quoted prices in active markets at the beginning of the period but such quoted prices were no longer available at the end of the period. The transfers from Level 2 into Level 1 comprised of securities for which quoted prices in active markets became available at the end of the period even though such quoted prices were not available at the beginning of the period. Changes in Level 3 Recurring Fair Value Measurements 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) during the six months ended September 30, 2016 and 2017. The determination to classify a financial instrument within Level 3 is based upon the significance of the unobservable inputs to overall fair value measurement. However, Level 3 financial instruments typically include, in addition to the unobservable or Level 3 input, observable inputs (that is, inputs that are actively quoted and can be validated to external sources). Accordingly, the gains and losses in the tables below include changes in fair value due in part to observable inputs used in the valuation techniques. Total gains (losses) Change in liabilities March 31, Included Included Purchases Issues Sales Settlements Transfers (5) Transfers (5) September 30, (in millions) Assets Trading account assets: Trading securities (1) ¥ 879,946 ¥ (86,056 ) (2) ¥ — ¥ 136,497 ¥ — ¥ (67,356 ) ¥ (118,887 ) ¥ 48,105 ¥ (26,875 ) ¥ 765,374 ¥ (80,271 ) (2) Debt securities Japanese national government and Japanese government agency bonds — (1,203 ) — — — — — 11,315 — 10,112 (1,203 ) Japanese prefectural and municipal bonds 2,467 84 — — — (2,551 ) — — — — — Foreign governments and official institutions bonds 57,470 (5,793 ) — 16,168 — (16,302 ) (50,611 ) — (6 ) 926 (132 ) Corporate bonds 98,236 (5,524 ) — 2,063 — (1,058 ) (55,571 ) 36,790 (6) (26,869 ) (6) 48,067 (5,098 ) Residential mortgage-backed securities 23,540 (9,188 ) — 38,086 — — (3,956 ) — — 48,482 (8,817 ) Asset-backed securities 630,247 (61,503 ) — 79,336 — (47,445 ) (7,914 ) — — 592,721 (61,717 ) Other debt securities 35,944 (3,807 ) — — — — — — — 32,137 (3,807 ) Equity securities 32,042 878 — 844 — — (835 ) — — 32,929 503 Trading derivatives—net 31,254 6,608 (2) (911 ) 544 (417 ) — (7,722 ) 1,535 (3,134 ) 27,757 14,318 (2) Interest rate contracts—net 38,213 (496 ) (597 ) — — — (4,428 ) 1,139 (817 ) 33,014 3,205 Foreign exchange contracts—net 1,235 417 105 477 (10 ) — (1,289 ) 396 (2,354 ) (1,023 ) 1,231 Equity contracts—net (7,915 ) 7,279 (384 ) 56 (56 ) — (2,125 ) — 37 (3,108 ) 9,678 Commodity contracts—net (345 ) (250 ) (18 ) 11 (351 ) — 97 — — (856 ) 415 Credit derivatives—net 66 (342 ) (17 ) — — — 23 — — (270 ) (211 ) Investment securities: Available-for-sale 375,274 (1,944 ) (3) (49,778 ) 138,693 — (42 ) (156,705 ) 39 (5,681 ) 299,856 151 (3) Debt securities Foreign governments and official institutions bonds 20,941 — (2,674 ) 258 — — (255 ) — — 18,270 — Corporate bonds 23,595 408 (513 ) 9,086 — (42 ) (4,964 ) 39 (6) (5,681 ) (6) 21,928 151 Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed securities 3,764 — (400 ) — — — (43 ) — — 3,321 — Asset-backed securities 158,281 (2,352 ) (21,435 ) 120,722 — — (142,666 ) — — 112,550 — Other debt securities 168,678 — (24,756 ) 8,627 — — (8,777 ) — — 143,772 — Other investment securities 24,689 2,487 (4) — 2,077 — (3,162 ) (13 ) — — 26,078 (301 ) (4) Others 846 (175 ) (4) (140 ) 448 — (25 ) — 1,454 — 2,408 (328 ) (4) Total ¥ 1,312,009 ¥ (79,080 ) ¥ (50,829 ) ¥ 278,259 ¥ (417 ) ¥ (70,585 ) ¥ (283,327 ) ¥ 51,133 ¥ (35,690 ) ¥ 1,121,473 ¥ (66,431 ) Liabilities Others ¥ (9,821 ) ¥ 4,188 (4) ¥ 5,993 ¥ — ¥ 837 ¥ — ¥ (8,530 ) ¥ 6,791 ¥ (15,678 ) ¥ (36,582 ) ¥ 6,001 (4) Total ¥ (9,821 ) ¥ 4,188 ¥ 5,993 ¥ — ¥ 837 ¥ — ¥ (8,530 ) ¥ 6,791 ¥ (15,678 ) ¥ (36,582 ) ¥ 6,001 Total gains (losses) Change in unrealized gains (losses) included in earnings for assets and liabilities March 31, Included Included Purchases Issues Sales Settlements Transfers (5) Transfers (5) September 30, (in millions) Assets Trading account assets: Trading securities (1) ¥ 799,493 ¥ 18,075 (2) ¥ — ¥ 522,384 ¥ — ¥ (128,188 ) ¥ (240,479 ) ¥ 20,416 ¥ (10,571 ) ¥ 981,130 ¥ 18,905 (2) Debt securities Japanese national government and Japanese government agency bonds — (4 ) — 1,079 — — — — — 1,075 (4 ) Foreign governments and official institutions bonds 1,836 341 — 37,112 — (37,369 ) (47 ) — (973 ) 900 69 Corporate bonds 25,521 (1,979 ) — 3,170 — (533 ) (3,347 ) 20,317 (6) (9,598 ) (6) 33,551 (1,957 ) Residential mortgage-backed securities 47,914 2,344 — — — — (4,044 ) — — 46,214 2,306 Asset-backed securities 654,814 16,454 — 476,136 — (88,454 ) (232,251 ) — — 826,699 18,037 Other debt securities 35,552 78 — — — — — — — 35,630 79 Equity securities 33,856 841 — 4,887 — (1,832 ) (790 ) 99 — 37,061 375 Trading derivatives—net 37,245 7,470 (2) 133 568 (1,385 ) — (13,829 ) 1,817 (2,453 ) 29,566 10,436 (2) Interest rate contracts—net 28,551 (303 ) (93 ) — — — (6,231 ) (3,399 ) 402 18,927 400 Foreign exchange contracts—net 14,858 (5,533 ) 115 235 (228 ) — 189 5,216 (3,461 ) 11,391 (2,516 ) Equity contracts—net (6,312 ) 13,082 112 332 (794 ) — (7,887 ) — 606 (861 ) 11,710 Commodity contracts—net 370 261 (1 ) 1 (363 ) — 55 — — 323 880 Credit derivatives—net (222 ) (37 ) — — — — 45 — — (214 ) (38 ) Investment securities: Available-for-sale 337,526 2,053 (3) (10,705 ) 139,993 — (30 ) (118,202 ) 93 (30,390 ) 320,338 (69 ) (3) Debt securities Foreign governments and official institutions bonds 20,099 — (184 ) 248 — — (54 ) — — 20,109 — Corporate bonds 36,932 115 (17 ) 521 — (30 ) (446 ) 93 (6) (30,390 ) (6) 6,778 (69 ) Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed securities 2,971 — (49 ) — — — (38 ) — — 2,884 — Asset-backed securities 116,919 1,938 (4,971 ) 139,224 — — (115,699 ) — — 137,411 — Other debt securities 160,590 — (5,484 ) — — — (1,965 ) — — 153,141 — Other investment securities 26,292 (648 ) (4) — 1,366 — (1,194 ) — — (252 ) 25,564 (1,280 ) (4) Others 3,850 (275 ) (4) (121 ) 3,277 — (3 ) — — — 6,728 (362 ) (4) Total ¥ 1,204,406 ¥ 26,675 ¥ (10,693 ) ¥ 667,588 ¥ (1,385 ) ¥ (129,415 ) ¥ (372,510 ) ¥ 22,326 ¥ (43,666 ) ¥ 1,363,326 ¥ 27,630 Liabilities Others ¥ 28,432 ¥ (24,919 ) (4) ¥ (595 ) ¥ — ¥ 4,243 ¥ — ¥ (13,055 ) ¥ 1,888 ¥ (15,407 ) ¥ 31,615 ¥ (18,694 ) (4) Total ¥ 28,432 ¥ (24,919 ) ¥ (595 ) ¥ — ¥ 4,243 ¥ — ¥ (13,055 ) ¥ 1,888 ¥ (15,407 ) ¥ 31,615 ¥ (18,694 ) Notes: (1 ) Includes Trading securities measured under the fair value option. (2 ) Included in Trading account profits—net and in Foreign exchange losses—net. (3 ) Included in Investment securities gains—net. (4 ) Included in Trading account profits—net. (5 ) All transfers out of Level 3 or into Level 3 were assumed to have occurred at the beginning of the period. (6 ) Transfers into (out of) Level 3 for corporate bonds were mainly caused by the decrease (increase) in liquidity. Quantitative Information about Level 3 Fair Value Measurements The following tables present information on the valuation techniques, significant unobservable inputs and their ranges for each major category of assets and liabilities measured at fair value on a recurring basis and classified in Level 3: At March 31, 2017 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign governments and official institutions bonds ¥ 20,099 Return on equity method Probability of default 0.1%~0.4% 0.3 % Recovery rate 60.0%~70.0% 67.0 % Market-required return on capital 8.0%~10.0% 9.0 % Corporate bonds 19,313 Discounted cash flow Probability of default 4.4%~8.8% 5.6 % Recovery rate 41.0%~81.2% 42.8 % Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities 108,132 Discounted cash flow Probability of default 1.2%~5.3% 4.3 % Recovery rate 60.0%~76.0% 64.7 % 650,814 Internal model (4) Asset correlations 7.0%~11.0% 11.0 % Discount factor 1.2%~1.4% 1.2 % Prepayment rate 9.5%~29.5% 29.3 % Probability of default 0.0%~83.1% — (3) Recovery rate 52.8%~80.9% 80.6 % Other debt securities 35,552 Discounted cash flow Liquidity premium 0.5%~1.0% 0.6 % 160,479 Return on equity method Probability of default 0.0%~25.0% 0.3 % Recovery rate 40.0%~90.0% 71.1 % Market-required return on capital 8.0%~10.0% 9.7 % At March 31, 2017 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net 28,297 Option model Probability of default 0.1%~13.2% Correlation between interest rates 36.0%~100.0% Correlation between interest rate and foreign exchange rate 20.4%~48.8% Recovery rate 41.0%~48.0% Volatility 21.6%~100.0% Foreign exchange contracts—net 14,890 Option model Probability of default 0.1%~8.7% Correlation between interest rates 40.3%~74.0% Correlation between interest rate and foreign exchange rate 46.4%~50.7% Correlation between underlying assets 85.0% Recovery rate 41.0%~48.0% Volatility 16.8%~20.6% Equity contracts—net (6,659 ) Option model Correlation between interest rate and equity 33.3%~39.0% Correlation between foreign exchange rate and equity 3.0%~69.2% Correlation between equities 25.5%~81.3% Volatility 29.8%~127.4% At September 30, 2017 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign governments and official institutions bonds ¥ 20,109 Return on equity method Probability of default 0.1%~0.4% 0.3 % Recovery rate 60.0%~70.0% 66.7 % Market-required return on capital 8.0%~10.0% 9.5 % Corporate bonds 3,323 Discounted cash flow Probability of default 8.1% 8.1 % Recovery rate 41.0%~68.3% 45.9 % Residential mortgage- 124,629 Discounted cash flow Probability of default 1.2%~5.3% 4.4 % Recovery rate 60.0%~76.0% 67.1 % 826,699 Internal model (4) Asset correlations 11.0% 11.0 % Discount factor 1.1% 1.1 % Prepayment rate 40.5% 40.5 % Probability of default 0.0%~87.9% — (3) Recovery rate 71.5% 71.5 % Other debt securities 35,630 Discounted cash flow Liquidity premium 0.5%~1.0% 0.6 % 153,030 Return on equity method Probability of default 0.0%~25.0% 0.4 % Recovery rate 40.0%~90.0% 71.6 % Market-required return on capital 8.0%~10.0% 9.7 % At September 30, 2017 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net 18,732 Option model Probability of default 0.0%~12.6% Correlation between interest rates 35.7%~51.4% Correlation between interest rate and foreign exchange rate 20.9%~51.5% Recovery rate 41.0%~48.0% Volatility 18.9%~100.0% Probability of prepayment 100.0% Foreign exchange contracts—net 11,424 Option model Probability of default 0.0%~12.6% Correlation between interest rates 40.3%~74.0% Correlation between interest rate and foreign exchange rate 46.4%~50.7% Correlation between underlying assets 85.0% Recovery rate 41.0%~48.0% Volatility 12.3%~17.8% Equity contracts—net (5,598 ) Option model Correlation between interest rate and equity 13.7%~39.0% Correlation between foreign exchange rate and equity 3.0%~68.5% Correlation between equities 21.8%~82.9% 5,313 Discounted cash flow Term of litigation 2.5 years Notes: (1 ) The fair value as of March 31, 2017 and September 30, 2017 excludes the fair value of investments valued using vendor prices. (2 ) Weighted averages are calculated by weighing each input by the relative fair value of the respective financial instruments. (3 ) See “Probability of default” in “Sensitivity to and range of unobservable inputs” in Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. (4 ) For further detail of Internal model, refer to the last paragraph of “Trading Account Assets and Liabilities—Trading Account Securities” in Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. Sensitivity to and range of unobservable inputs For a discussion of the impact on fair value of changes in unobservable inputs and the relationships between unobservable inputs as well as a description of attributes of the underlying instruments and external market factors that affect the range of inputs used in the valuation of the MUFG Group’s Level 3 financial instruments, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. Valuation Process for Level 3 Fair Value Measurements The MUFG Group establishes valuation policies and procedures for measuring fair value, for which the risk management departments ensure that the valuation techniques used are logical, appropriate and consistent with market information. The financial accounting offices ensure that the valuation techniques are consistent with the accounting policies. See Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017 for further information on the MUFG Group’s valuation process and a detailed discussion of the determination of fair value for individual financial instruments. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Certain assets and liabilities may be measured at fair value on a nonrecurring basis in periods subsequent to their initial recognition. These assets are subject to fair value adjustments that result from the application of the lower of cost or fair value accounting or write-downs of individual assets. See Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017 for further information on assets and liabilities measured at fair value on a nonrecurring basis. The following table presents the carrying value of assets measured at fair value on a nonrecurring basis by level within the fair value hierarchy as of March 31, 2017 and September 30, 2017: March 31, 2017 September 30, 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Assets Investment securities (1) ¥ — ¥ — ¥ 2,224 ¥ 2,224 ¥ — ¥ — ¥ 1,397 ¥ 1,397 Loans 4,941 9,020 219,963 233,924 4,746 12,179 258,715 275,640 Loans held for sale — — 6,480 6,480 — — 25,339 25,339 Collateral dependent loans 4,941 9,020 213,483 227,444 4,746 12,179 233,376 250,301 Premises and equipment — — 3,507 3,507 — — 7,960 7,960 Intangible assets — — 1,652 1,652 — — 8,458 8,458 Goodwill — — 4,869 4,869 — — — — Other assets — — 6,872 6,872 92,223 — 3,841 96,064 Investments in equity method investees (1) — — — — 92,223 — — 92,223 Other — — 6,872 6,872 — — 3,841 3,841 Total ¥ 4,941 ¥ 9,020 ¥ 239,087 ¥ 253,048 ¥ 96,969 ¥ 12,179 ¥ 280,371 ¥ 389,519 Note: (1 ) Excludes certain investments valued at net asset value of ¥15,884 million and ¥10,340 million at March 31, 2017 and September 30, 2017, respectively. The unfunded commitments related to these investments are ¥5,359 million and ¥1,167 million at March 31, 2017 and September 30, 2017, respectively. These investments are in private equity funds. For the nature and details of private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. The following table presents losses recorded as a result of changes in the fair value of assets measured at fair value on a nonrecurring basis for the six months ended September 30, 2016 and 2017: Losses for the 2016 2017 (in millions) Investment securities ¥ 388 ¥ 284 Loans 32,889 25,781 Loans held for sale 343 249 Collateral dependent loans 32,546 25,532 Premises and equipment 4,706 6,227 Intangible assets 968 16,591 Other assets 2,271 28,395 Investments in equity method investees 1,820 27,985 Other 451 410 Total ¥ 41,222 ¥ 77,278 Fair Value Option For a discussion of the primary financial instruments for which the fair value option was previously elected, including the basis for those, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. The following table presents the gains or losses recorded for the six months ended September 30, 2016 and 2017 related to the eligible instruments for which the MUFG Group elected the fair value option: Six months ended September 30, 2016 2017 Trading Foreign Total Trading Foreign Total (in millions) Financial assets: Trading account securities ¥ 153,101 ¥ (2,446,921 ) ¥ (2,293,820 ) ¥ 90,632 ¥ 460,947 ¥ 551,579 Total ¥ 153,101 ¥ (2,446,921 ) ¥ (2,293,820 ) ¥ 90,632 ¥ 460,947 ¥ 551,579 Financial liabilities: Other short-term borrowings (1) ¥ (7,129 ) ¥ — ¥ (7,129 ) ¥ 2,054 ¥ — ¥ 2,054 Long-term debt (1) (100,379 ) — (100,379 ) 1,172 — 1,172 Total ¥ (107,508 ) ¥ — ¥ (107,508 ) ¥ 3,226 ¥ — ¥ 3,226 Note: (1) Change in value attributable to the instrument-specific credit risk related to those financial liabilities are not material. The following table presents the differences between the aggregate fair value and the aggregate remaining contractual principal balance outstanding as of March 31, 2017 and September 30, 2017 for long-term debt instruments for which the fair value option has been elected: March 31, 2017 September 30, 2017 Remaining Fair value Fair value Remaining Fair value Fair value (in millions) Financial liabilities: Long-term debt ¥ 404,510 ¥ 377,423 ¥ (27,087 ) ¥ 369,452 ¥ 348,196 ¥ (21,256 ) Total ¥ 404,510 ¥ 377,423 ¥ (27,087 ) ¥ 369,452 ¥ 348,196 ¥ (21,256 ) Interest income and expense related to the assets and liabilities for which the fair value option is elected are measured based on the contractual rates and dividend income related to these assets are recognized when the shareholder right to receive the dividend is established. These interest income and expense and dividend income are reported in the accompanying condensed consolidated statements of income as either interest income or expense, depending on the nature of the related asset or liability. Estimated Fair Value of Financial Instruments The following is a summary of carrying amounts and estimated fair values by level within the fair value hierarchy of financial instruments which are not carried at fair value on a recurring basis in the accompanying condensed consolidated balance sheets as of March 31, 2017 and September 30, 2017: At March 31, 2017 Carrying Estimated fair value Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 25,683 ¥ 25,683 ¥ 25,683 ¥ — ¥ — Interest-earning deposits in other banks 38,327 38,327 — 38,327 — Call loans and funds sold 704 704 — 704 — Receivables under resale agreements 8,188 8,188 — 8,188 — Receivables under securities borrowing transactions 11,003 11,003 — 11,003 — Investment securities (1)(2) 3,688 3,808 1,206 1,144 1,458 Loans, net of allowance for credit losses (3) 117,033 118,765 5 257 118,503 Other financial assets (4) 5,827 5,827 — 5,827 — Financial liabilities: Deposits Non-interest-bearing ¥ 29,486 ¥ 29,486 ¥ — ¥ 29,486 ¥ — Interest-bearing 160,928 160,948 — 160,948 — Total deposits 190,414 190,434 — 190,434 — Call money and funds purchased 1,975 1,975 — 1,975 — Payables under repurchase agreements 16,081 16,081 — 16,081 — Payables under securities lending transactions 5,549 5,549 — 5,549 — Due to trust account 3,335 3,335 — 3,335 — Other short-term borrowings 7,857 7,857 — 7,857 — Long-term debt 27,475 27,627 — 27,627 — Other financial liabilities 6,094 6,094 — 6,094 — At September 30, 2017 Carrying Estimated fair value Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 30,987 ¥ 30,987 ¥ 30,987 ¥ — ¥ — Interest-earning deposits in other banks 39,128 39,128 — 39,128 — Call loans and funds sold 757 757 — 757 — Receivables under resale agreements 6,701 6,701 — 6,701 — Receivables under securities borrowing transactions 9,839 9,839 — 9,839 — Investment securities (1)(2) 3,330 3,449 1,201 1,106 1,142 Loans, net of allowance for credit losses (3) 117,319 118,767 5 261 118,501 Other financial assets (4) 7,372 7,372 — 7,372 — Financial liabilities: Deposits Non-interest-bearing ¥ 28,367 ¥ 28,367 ¥ — ¥ 28,367 ¥ — Interest-bearing 163,430 163,440 — 163,440 — Total deposits 191,797 191,807 — 191,807 — Call money and funds purchased 2,529 2,529 — 2,529 — Payables under repurchase agreements 17,119 17,119 — 17,119 — Payables under securities lending transactions 4,790 4,790 — 4,790 — Due to trust account 3,088 3,088 — 3,088 — Other short-term borrowings 8,037 8,037 — 8,037 — Long-term debt 29,866 30,028 — 30,028 — Other financial liabilities 6,952 6,952 — 6,952 — Notes: (1) Includes impaired securities measured at fair value on a nonrecurring basis. Refer to “Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis” for the details of the level classification. (2) Excludes cost-method investments of ¥429 billion and ¥430 billion at March 31, 2017 and September 30, 2017, respectively, of which the MUFG Group did not estimate the fair value since it was not practical and no impairment indicators were identified. See Note 3 for the details of these cost-method investments. (3) Includes loans held for sale and collateral dependent loans measured at fair value on a nonrecurring basis. Refer to “Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis” for the details of the level classification. (4) Excludes investments in equity method investees of ¥2,200 billion and ¥2,216 billion at March 31, 2017 and September 30, 2017, respectively. For additional information regarding the financial instruments within the scope of this disclosure, and the methods and significant assumptions used by the MUFG Group to estimate their fair values of financial instruments that are not recorded at fair value in the accompanying condensed consolidated balance sheets, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. The fair values of certain off-balance

Investments in Equity Method In

Investments in Equity Method Investees [Text Block]	6 Months Ended
	Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Investments in Equity Method Investees [Text Block]	18. INVESTMENTS IN EQUITY METHOD INVESTEES Summarized Financial Information of the MUFG Group’s Equity Method Investee Summarized operating results of Morgan Stanley, the largest portion of the MUFG Group’s equity method investees, for the six months ended September 30, 2016 and 2017 are as follows: 2016 2017 (in billions) Net revenues ¥ 1,876 ¥ 2,077 Total non-interest 1,364 1,508 Income from continuing operations before income taxes 512 569 Net income applicable to Morgan Stanley 335 393

Subsequent Events _Text Block_

Subsequent Events [Text Block]	6 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	19. SUBSEQUENT EVENTS Approval of Dividends On November 14, 2017, the Board of Directors of MUFG approved the payment of semi-annual interim cash dividends of ¥9 per share of Common stock, totaling ¥119,890 million, that were payable on December 5, 2017 to the shareholders of record on September 30, 2017. Repurchase and Cancellation of own shares From November 15, 2017 to December 22, 2017, MUFG repurchased 127,666,900 shares of MUFG’s common stock by market purchases based on the discretionary dealing contract regarding repurchase of own shares for approximately ¥100 billion, in aggregate, in satisfaction of the resolution adopted at the meeting of the Board of Directors of MUFG held on November 14, 2017. The repurchase plan as authorized by the Board of Directors of MUFG allowed for the repurchase of an aggregate amount of up to 200,000,000 shares, which represents the equivalent of 1.50% of the total number of common shares outstanding, or of an aggregate repurchase amount of up to ¥100 billion. The purpose of the repurchase is to enhance the return of earnings to shareholders, to improve capital efficiency, and to implement flexible capital policies. On January 22, 2018, MUFG will cancel all of the acquired shares in satisfaction of the resolution adopted at the meeting of the Board of Directors of MUFG held on November 14, 2017. Announcement to redeem “Non-dilutive” On December 5, 2017, the Board of Directors of MUFG approved to redeem in total ¥150 billion of non-cumulative non-dilutive Acquisition of shares in Bank Danamon in Indonesia On December 26, 2017, BTMU entered into conditional share purchase agreements with Asia Financial (Indonesia) Pte. Ltd. (“AFI”) and other affiliated entities (the “Sellers”) to acquire their 73.8% equity interests in an Indonesian bank, PT Bank Danamon Indonesia, Tbk. (“Danamon”), subject to applicable regulatory approvals. Danamon, which was established in 1956, is the fifth most profitable Indonesian commercial bank in terms of net income. Danamon provides banking and financial products and services to consumer, micro-finance, small and medium enterprise (“SME”) and corporate customers, with a network of around 1,800 offices in Indonesia. BTMU intends to establish an integrated and comprehensive services platform that serves as a gateway for clients wishing to make inroads into Indonesia’s growing economy as well as local companies seeking to expand into the region. This investment is also expected to strategically allow BTMU to benefit from Danamon’s foothold in the developing local retail and SME segments to deepen its banking franchise in Indonesia. This strategic investment by BTMU will be executed through three steps (the “Proposed Transaction”), and the completion of the Proposed Transaction will result in BTMU becoming the largest shareholder in Danamon and Danamon becoming a consolidated subsidiary of BTMU. In Step 1, BTMU acquired an initial 19.9% equity interest in Danamon from the Sellers on December 29, 2017, based on a price of IDR 8,323 (approximately ¥70 (1) ) per share, for an investment amount of IDR 15,875 billion (approximately ¥133 billion (1) ). The price was based on a price book-value ratio of 2.0 calculated on the basis of Danamon’s net assets as of September 30, 2017 with certain adjustments applied. AFI continues to be the majority shareholder in Danamon after closing of Step 1. In Step 2, BTMU intends to seek regulatory approvals and other relevant approvals to acquire an additional 20.1% to increase its equity interest in Danamon to 40%. This step is expected to close between April and September of 2018, subject to receiving these approvals. The prices for Danamon’s shares in Step 2 will be based on a similar approach to Step 1. In Step 3, upon completion of Step 2, BTMU intends to seek the necessary approvals to increase its equity interest in Danamon beyond the 40%, and this will provide an opportunity for all other existing Danamon shareholders to either remain as shareholders or receive cash from BTMU. With the closing of Step 3, BTMU’s final equity interest in Danamon is expected to be above 73.8%. The prices for Danamon’s shares in Step 3 will be based on a similar approach as Step 1. Note: (1) Calculated based on the exchange rate of IDR1 = ¥0.0084

Basis of Semiannual Condensed30

Basis of Semiannual Condensed Consolidated Financial Statements [Text Block] (Policies)	6 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Description of Business [Policy Text Block]	Description of Business Mitsubishi UFJ Financial Group, Inc. (“MUFG”) is a holding company for The Bank of Tokyo-Mitsubishi UFJ, Ltd. (“BTMU”), Mitsubishi UFJ Trust and Banking Corporation (“MUTB”), Mitsubishi UFJ Securities Holdings Co., Ltd. (“MUSHD”), Mitsubishi UFJ NICOS Co., Ltd. (“Mitsubishi UFJ NICOS”), and other subsidiaries. MUSHD is an intermediate holding company for Mitsubishi UFJ Morgan Stanley Securities Co., Ltd. (“MUMSS”). Through its subsidiaries and affiliated companies, MUFG engages in a broad range of financial operations, including commercial banking, investment banking, trust banking and asset management services, securities businesses, and credit card businesses, and it provides related services to individual and corporate customers. See Note 16 for more information by business segment.
Basis of Financial Statements [Policy Text Block]	Basis of Financial Statements The accompanying semiannual condensed consolidated financial statements are presented in Japanese yen, the currency of the country in which MUFG is incorporated and principally operates. The accompanying condensed consolidated financial statements include the accounts of MUFG, its subsidiaries and certain variable interest entities (“VIE”s) (together, the “MUFG Group”), and reflect all adjustments (consisting of normal recurring adjustments) that, in the opinion of management, are necessary to conform with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements for the fiscal year ended March 31, 2017. Certain information that would be included in annual financial statements but is not required for semiannual reporting purposes under U.S. GAAP has been omitted or condensed.
Use of Estimates [Policy Text Block]	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Accounting Changes [Policy Text Block]	Accounting Changes Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships— Contingent Put and Call Options in Debt Instruments— Simplifying the Transition to the Equity Method of Accounting available-for-sale Improvements to Employee Share-Based Payment Accounting
Recently Issued Accounting Pronouncements [Policy Text Block]	Recently Issued Accounting Pronouncements Revenue from Contracts with Customers Recognition and Measurement of Financial Assets and Financial Liabilities— available-for-sale Leases— right-of-use gross-up right-of-use gross-up Recognition of Breakage for Certain Prepaid Stored-Value Products— to require that breakage for those liabilities be accounted for consistent with the breakage model required by the guidance on revenue from contracts with customers for non-financial Measurement of Credit Losses on Financial Instruments available-for-sale Classification of Certain Cash Receipts and Cash Payments— Intra-Entity Transfers of Assets Other Than Inventory— Restricted Cash— beginning-of-period end-of-period Clarifying the Definition of a Business Simplifying the Test for Goodwill Impairment Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost Premium Amortization on Purchased Callable Debt Securities Scope of Modification Accounting Targeted Improvements to Accounting for Hedging Activities

Investment Securities _Text B31

Investment Securities [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-for-sale Securities and Held-to-maturity Securities [Table Text Block]	At March 31, 2017: Amortized Gross Gross Fair value (in millions) Available-for-sale Debt securities: Japanese national government and Japanese government agency bonds ¥ 25,435,570 ¥ 396,057 ¥ 5,339 ¥ 25,826,288 Japanese prefectural and municipal bonds 1,010,336 9,598 4,445 1,015,489 Foreign governments and official institutions bonds 2,162,897 14,006 26,974 2,149,929 Corporate bonds 1,121,967 20,854 1,089 1,141,732 Residential mortgage-backed securities 1,203,685 551 15,318 1,188,918 Commercial mortgage-backed securities 80,564 454 750 80,268 Asset-backed securities 1,374,754 5,416 1,898 1,378,272 Other debt securities (1) 169,185 4,899 3,295 170,789 Marketable equity securities 2,736,976 3,407,915 6,477 6,138,414 Total ¥ 35,295,934 ¥ 3,859,750 ¥ 65,585 ¥ 39,090,099 Held-to-maturity Debt securities: Japanese national government and Japanese government agency bonds ¥ 1,100,955 ¥ 43,115 ¥ — ¥ 1,144,070 Foreign governments and official institutions bonds 61,135 1,113 — 62,248 Corporate bonds 100 — — 100 Residential mortgage-backed securities 962,492 4,009 11,196 (2) 955,305 Commercial mortgage-backed securities 184,336 5,065 768 (2) 188,633 Asset-backed securities 1,278,303 9,277 185 1,287,395 Total ¥ 3,587,321 ¥ 62,579 ¥ 12,149 ¥ 3,637,751 Notes: (1) Other debt securities in the table above include ¥160,479 million of private placement debt conduit bonds. (2) MUFG Americas Holdings Corporation (“MUAH”) reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale Held-to-maturity At September 30, 2017: Amortized Gross Gross Fair value (in millions) Available-for-sale Debt securities: Japanese national government and Japanese government agency bonds ¥ 22,226,590 ¥ 289,182 ¥ 7,149 ¥ 22,508,623 Japanese prefectural and municipal bonds 1,248,562 6,912 4,863 1,250,611 Foreign governments and official institutions bonds 2,312,548 15,203 26,100 2,301,651 Corporate bonds 1,098,500 15,770 1,204 1,113,066 Residential mortgage-backed securities 1,470,166 983 11,070 1,460,079 Commercial mortgage-backed securities 82,618 694 442 82,870 Asset-backed securities 1,500,616 6,274 1,237 1,505,653 Other debt securities (1) 161,044 4,309 2,267 163,086 Marketable equity securities 2,567,398 3,881,355 6,862 6,441,891 Total ¥ 32,668,042 ¥ 4,220,682 ¥ 61,194 ¥ 36,827,530 Held-to-maturity Debt securities: Japanese national government and Japanese government agency bonds ¥ 1,100,892 ¥ 40,268 ¥ — ¥ 1,141,160 Foreign governments and official institutions bonds 58,633 881 — 59,514 Corporate bonds 50 — — 50 Residential mortgage-backed securities 932,328 3,985 8,686 (2) 927,627 Commercial mortgage-backed securities 174,223 5,237 636 (2) 178,824 Asset-backed securities 964,725 5,988 79 970,634 Total ¥ 3,230,851 ¥ 56,359 ¥ 9,401 ¥ 3,277,809 Notes: (1) Other debt securities in the table above include ¥153,030 million of private placement debt conduit bonds. (2) MUAH reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale Held-to-maturity
Amortized Cost and Fair Value by Contractual Maturity [Table Text Block]	Held-to-maturity debt securities Available-for-sale debt securities Amortized cost Fair value Fair value (in millions) Due in one year or less ¥ 50 ¥ 50 ¥ 12,477,989 Due from one year to five years 164,798 168,113 9,181,806 Due from five years to ten years 1,706,867 1,750,883 4,353,645 Due after ten years 1,359,136 1,358,763 4,372,199 Total ¥ 3,230,851 ¥ 3,277,809 ¥ 30,385,639
Investments by Length and Category in Continuous Loss Position [Table Text Block]	Less than 12 months 12 months or more Total At March 31, 2017: Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value Gross Number of (in millions, except number of securities) Available-for-sale Debt securities: Japanese national government and Japanese government agency bonds ¥ 6,088,856 ¥ 5,339 ¥ — ¥ — ¥ 6,088,856 ¥ 5,339 107 Japanese prefectural and municipal bonds 579,684 4,445 — — 579,684 4,445 139 Foreign governments and official institutions bonds 1,034,336 26,677 115,053 297 1,149,389 26,974 142 Corporate bonds 277,394 933 15,613 156 293,007 1,089 160 Residential mortgage-backed securities 754,557 14,086 81,065 1,232 835,622 15,318 412 Commercial mortgage-backed securities 51,360 748 1,298 2 52,658 750 65 Asset-backed securities 80,059 1,269 128,372 629 208,431 1,898 85 Other debt securities 35,375 1,488 50,845 1,807 86,220 3,295 26 Marketable equity securities 222,950 6,449 554 28 223,504 6,477 111 Total ¥ 9,124,571 ¥ 61,434 ¥ 392,800 ¥ 4,151 ¥ 9,517,371 ¥ 65,585 1,247 Held-to-maturity Debt securities: Residential mortgage-backed securities ¥ 523,237 ¥ 10,736 ¥ 161,453 ¥ 460 ¥ 684,690 ¥ 11,196 263 Commercial mortgage-backed securities 12,906 125 168,724 643 181,630 768 31 Asset-backed securities 25,679 13 101,345 172 127,024 185 5 Total ¥ 561,822 ¥ 10,874 ¥ 431,522 ¥ 1,275 ¥ 993,344 ¥ 12,149 299 Less than 12 months 12 months or more Total At September 30, 2017: Fair value Gross Fair value Gross Fair value Gross Number of (in millions, except number of securities) Available-for-sale Debt securities: Japanese national government and Japanese government agency bonds ¥ 8,258,526 ¥ 6,306 ¥ 85,561 ¥ 843 ¥ 8,344,087 ¥ 7,149 149 Japanese prefectural and municipal bonds 790,305 4,641 16,963 222 807,268 4,863 205 Foreign governments and official institutions bonds 1,271,852 24,457 130,981 1,643 1,402,833 26,100 120 Corporate bonds 310,254 1,093 21,342 111 331,596 1,204 152 Residential mortgage-backed securities 762,855 9,868 151,497 1,202 914,352 11,070 441 Commercial mortgage-backed securities 41,785 441 1,136 1 42,921 442 47 Asset-backed securities 232,469 1,126 14,186 111 246,655 1,237 61 Other debt securities 12,055 184 56,414 2,083 68,469 2,267 22 Marketable equity securities 57,648 6,835 533 27 58,181 6,862 78 Total ¥ 11,737,749 ¥ 54,951 ¥ 478,613 ¥ 6,243 ¥ 12,216,362 ¥ 61,194 1,275 Held-to-maturity Debt securities: Residential mortgage-backed securities ¥ 519,945 ¥ 8,616 ¥ 141,542 ¥ 70 ¥ 661,487 ¥ 8,686 280 Commercial mortgage-backed securities 11,672 140 161,175 496 172,847 636 31 Asset-backed securities 55,044 56 28,929 23 83,973 79 3 Total ¥ 586,661 ¥ 8,812 ¥ 331,646 ¥ 589 ¥ 918,307 ¥ 9,401 314
Roll-forward of Credit Loss Component Recognized in Earnings [Table Text Block]	Six months ended 2016 2017 (in millions) Balance at beginning of period ¥ 6,691 ¥ 4,125 Additions: Initial credit impairments 35 107 Subsequent credit impairments 22 1 Reductions: Securities sold or matured (939 ) (403 ) Balance at end of period ¥ 5,809 ¥ 3,830

Loans and Allowance for Credi32

Loans and Allowance for Credit Losses [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Loans by Domicile and Industry of Borrower Segment Classification [Table Text Block]	March 31, September 30, (in millions) Domestic: Manufacturing ¥ 11,796,803 ¥ 11,478,200 Construction 819,262 747,597 Real estate 11,622,372 11,628,219 Services 2,549,300 2,483,356 Wholesale and retail 7,970,579 8,111,508 Banks and other financial institutions (1) 5,223,906 4,928,322 Communication and information services 1,634,584 1,578,257 Other industries 8,898,712 8,653,551 Consumer 16,491,010 16,292,794 Total domestic 67,006,528 65,901,804 Foreign: Governments and official institutions 1,037,795 1,132,064 Banks and other financial institutions (1) 13,844,964 14,333,357 Commercial and industrial 30,279,641 30,544,651 Other 6,334,551 6,603,552 Total foreign 51,496,951 52,613,624 Unearned income, unamortized premiums—net and deferred loan fees—net (288,507 ) (280,005 ) Total (2) ¥ 118,214,972 ¥ 118,235,423 Notes: (1) Loans to so-called “non-bank Non-bank (2) The above table includes loans held for sale of ¥185,940 million at March 31, 2017 and ¥148,761 million at September 30, 2017, respectively.
Nonaccrual Loans by Class [Table Text Block]	March 31, September 30, (in millions) Commercial Domestic ¥ 471,148 ¥ 464,509 Manufacturing 185,095 170,053 Construction 15,202 11,928 Real estate 44,374 36,058 Services 38,602 34,240 Wholesale and retail 131,213 121,408 Banks and other financial institutions 2,432 1,404 Communication and information services 18,685 22,673 Other industries 10,034 43,559 Consumer 25,511 23,186 Foreign-excluding MUAH and Krungsri 191,889 121,698 Residential 75,399 72,577 Card 61,424 61,350 MUAH 82,150 54,056 Krungsri 94,902 107,406 Total (1) ¥ 976,912 ¥ 881,596 Note: (1) The above table does not include loans held for sale of nil and ¥8,549 million at March 31, 2017 and September 30, 2017, respectively, and loans acquired with deteriorated credit quality of ¥9,720 million and ¥8,281 million, at March 31, 2017 and September 30, 2017, respectively.
Impaired Loans by Class [Table Text Block]	Recorded Loan Balance At March 31, 2017: Requiring Not Requiring (1) Total (2) Unpaid Related (in millions) Commercial Domestic ¥ 875,977 ¥ 187,738 ¥ 1,063,715 ¥ 1,107,203 ¥ 608,122 Manufacturing 555,009 39,587 594,596 602,038 411,787 Construction 15,007 9,068 24,075 24,907 9,107 Real estate 53,048 30,274 83,322 90,797 14,987 Services 48,304 23,162 71,466 78,097 31,074 Wholesale and retail 160,422 53,760 214,182 224,141 115,673 Banks and other financial institutions 1,836 607 2,443 2,443 1,674 Communication and information services 14,166 10,652 24,818 26,641 10,565 Other industries 10,714 5,806 16,520 17,403 7,226 Consumer 17,471 14,822 32,293 40,736 6,029 Foreign-excluding MUAH and Krungsri 262,887 23,019 285,906 309,975 164,682 Loans acquired with deteriorated credit quality 8,013 — 8,013 11,513 3,619 Residential 120,465 6,557 127,022 154,006 46,971 Card 71,849 462 72,311 80,392 20,523 MUAH 77,160 16,292 93,452 113,414 19,173 Krungsri 44,679 20,752 65,431 71,075 19,118 Total (3) ¥ 1,461,030 ¥ 254,820 ¥ 1,715,850 ¥ 1,847,578 ¥ 882,208 Recorded Loan Balance At September 30, 2017: Requiring Not Requiring (1) Total (2) Unpaid Related (in millions) Commercial Domestic ¥ 798,605 ¥ 174,397 ¥ 973,002 ¥ 1,011,187 ¥ 481,924 Manufacturing 465,650 38,861 504,511 510,778 264,592 Construction 12,106 7,600 19,706 20,515 8,221 Real estate 48,164 25,540 73,704 79,420 12,289 Services 41,362 20,071 61,433 65,892 28,420 Wholesale and retail 149,155 50,112 199,267 209,028 107,728 Banks and other financial institutions 1,634 27 1,661 1,661 1,354 Communication and information services 19,999 8,254 28,253 29,661 16,303 Other industries 47,146 7,934 55,080 56,503 38,546 Consumer 13,389 15,998 29,387 37,729 4,471 Foreign-excluding MUAH and Krungsri 141,967 43,722 185,689 211,938 70,803 Loans acquired with deteriorated credit quality 9,703 — 9,703 17,683 3,939 Residential 113,729 6,130 119,859 145,237 26,785 Card 69,440 408 69,848 77,497 20,457 MUAH 50,796 29,304 80,100 92,992 9,957 Krungsri 56,160 21,949 78,109 85,136 28,412 Total (3) ¥ 1,240,400 ¥ 275,910 ¥ 1,516,310 ¥ 1,641,670 ¥ 642,277 Notes: (1) These loans do not require an allowance for credit losses because the recorded loan balance equals, or does not exceed, the present value of expected future cash flows discounted at the loans’ effective interest rate, loans’ observable market price, or the fair value of the collateral if the loan is a collateral-dependent loan. (2) Included in impaired loans at March 31, 2017 and September 30, 2017 are accrual TDRs as follows: ¥688,746 million and ¥574,719 million—Commercial; ¥50,213 million and ¥45,957 million—Residential; ¥32,564 million and ¥30,467 million—Card; ¥24,708 million and ¥35,667 million—MUAH; and ¥23,588 million and ¥24,428 million—Krungsri, respectively. (3) In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥9,879 million and ¥21,585 million at March 31, 2017 and September 30, 2017, respectively.
Average Recorded Loan Balance and Recognized Interest Income on Impaired Loans by Class [Table Text Block]	2016 2017 Average Recognized Average Recognized (in millions) Commercial Domestic ¥ 999,938 ¥ 6,238 ¥ 952,510 ¥ 4,830 Manufacturing 484,687 2,505 509,211 1,812 Construction 24,336 200 20,112 144 Real estate 100,849 726 77,940 574 Services 80,076 569 62,750 381 Wholesale and retail 217,657 1,469 190,328 1,109 Banks and other financial institutions 641 4 2,030 7 Communication and information services 25,560 264 24,872 192 Other industries 26,766 207 34,783 387 Consumer 39,366 294 30,484 224 Foreign-excluding MUAH and Krungsri 294,123 1,977 235,723 3,573 Loans acquired with deteriorated credit quality 11,051 371 8,817 563 Residential 137,247 971 123,441 846 Card 76,953 1,334 71,080 1,052 MUAH 43,181 467 64,293 898 Krungsri 47,091 1,549 71,176 1,788 Total ¥ 1,609,584 ¥ 12,907 ¥ 1,527,040 ¥ 13,550
Roll-forward of Accrual TDRs and Other Impaired Loans [Table Text Block]	2016 2017 (in millions) Accrual TDRs: Balance at beginning of period ¥ 613,844 ¥ 819,819 Additions (new accrual TDR status) (1) 358,224 65,483 Transfers to other impaired loans (including nonaccrual TDRs) (28,876 ) (16,624 ) Loans sold (1,594 ) (16,776 ) Principal payments and other (115,714 ) (140,664 ) Balance at end of period (1) ¥ 825,884 ¥ 711,238 Other impaired loans (including nonaccrual TDRs): Balance at beginning of period ¥ 1,111,306 ¥ 896,031 Additions (new other impaired loans (including nonaccrual TDRs) status) (1)(2) 196,443 145,885 Charge-off (59,880 ) (57,238 ) Transfers to accrual TDRs (312,649 ) (20,000 ) Loans sold (12,951 ) (22,482 ) Principal payments and other (167,508 ) (137,124 ) Balance at end of period (1) ¥ 754,761 ¥ 805,072 Notes: (1) For the six months ended September 30, 2016, lease receivables of ¥51 million and ¥62 million in the Krungsri segment, which were accrual TDRs and nonaccrual TDRs, respectively, are excluded from the additions of accrual TDRs and other impaired loans, respectively, and the related ending balances of such TDRs amounting to ¥3,141 million and ¥772 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2016. For the six months ended September 30, 2017, lease receivables of ¥880 million and ¥70 million in the Krungsri segment, which were accrual TDRs and nonaccrual TDRs, respectively, are excluded from the additions of accrual TDRs and other impaired loans, respectively, and the related ending balances of such TDRs amounting to ¥4,644 million and ¥628 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2017. (2) Included in the additions of other impaired loans for the six months ended September 30, 2016 and 2017 are nonaccrual TDRs as follows: ¥5,527 million and ¥6,489 million—Card; ¥13,967 million and ¥3,366 million—MUAH; and ¥3,484 million and ¥6,108 million—Krungsri, respectively.
TDRs by Class [Table Text Block]	2016 2017 Troubled Debt Troubled Debt Troubled Debt Troubled Debt Pre- Post- Recorded Pre- Post- Recorded (in millions) Commercial (1)(3) Domestic ¥ 279,767 ¥ 279,767 ¥ 2,790 ¥ 28,645 ¥ 28,603 ¥ 2,996 Manufacturing 251,468 251,468 1,089 12,502 12,460 368 Construction 1,287 1,287 — 142 142 — Real estate 4,796 4,796 — 1,107 1,107 10 Services 3,024 3,024 158 2,343 2,343 680 Wholesale and retail 15,046 15,046 1,510 9,889 9,889 1,778 Banks and other financial institutions — — — 246 246 — Communication and information services 2,001 2,001 — 1,072 1,072 135 Other industries 948 948 — 425 425 — Consumer 1,197 1,197 33 919 919 25 Foreign-excluding MUAH and Krungsri 49,767 49,767 — 9,983 9,983 — Loans acquired with deteriorated credit quality 1,030 1,030 — — — — Residential (1)(3) 7,160 7,160 78 5,459 5,459 124 Card (2)(3) 8,244 8,056 2,027 9,570 9,334 1,977 MUAH (2)(3) 21,721 21,608 1,641 18,878 18,878 2,331 Krungsri (2)(3) 13,927 13,927 1,198 9,856 9,856 1,735 Total ¥ 381,616 ¥ 381,315 ¥ 7,734 ¥ 82,391 ¥ 82,113 ¥ 9,163 Notes: (1) TDRs for the Commercial and Residential segments include accruing loans, and do not include nonaccrual loans. (2) TDRs for the Card, MUAH and Krungsri segments include accrual and nonaccrual loans. (3) For the six months ended September 30, 2016, extension of the stated maturity date of loans was the primary concession type in the Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card and Commercial segments and payment deferrals was the primary concession type in the MUAH segment. For the six months ended September 30, 2017, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUAH and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segments.
Outstanding Recorded Investment Balances of TDRs by Class [Table Text Block]	March 31, September 30, (in millions) Commercial (1) Domestic ¥ 592,578 ¥ 508,498 Manufacturing 409,500 334,467 Construction 8,881 7,778 Real estate 38,953 37,645 Services 32,864 27,192 Wholesale and retail 82,968 77,857 Banks and other financial institutions 11 256 Communication and information services 6,133 5,580 Other industries 6,486 11,523 Consumer 6,782 6,200 Foreign-excluding MUAH and Krungsri 96,168 66,221 Residential (1) 50,213 45,957 Card (2) 72,311 69,848 MUAH (2) 69,830 66,593 Krungsri (2) 46,651 52,308 Total ¥ 927,751 ¥ 809,425 Notes: (1) TDRs for the Commercial and Residential segments include accruing loans and do not include nonaccrual loans. (2) TDRs for the Card, MUAH and Krungsri segments include accrual and nonaccrual loans. Included in the outstanding recorded investment balances as of March 31, 2017 and September 30, 2017 are nonaccrual TDRs as follows: ¥39,747 million and ¥39,381 million—Card; ¥45,122 million and ¥30,926 million—MUAH; and ¥18,998 million and ¥23,236 million—Krungsri, respectively.
Credit Quality Indicators of Loans by Class [Table Text Block]	At March 31, 2017: Normal Close Likely to become Total (1) (in millions) Commercial Domestic ¥ 49,572,413 ¥ 2,161,965 ¥ 296,961 ¥ 52,031,339 Manufacturing 10,882,533 821,062 65,112 11,768,707 Construction 753,879 53,255 11,550 818,684 Real estate 11,137,637 352,785 42,382 11,532,804 Services 2,267,272 237,067 31,202 2,535,541 Wholesale and retail 7,403,680 462,577 98,423 7,964,680 Banks and other financial institutions 5,207,774 14,341 892 5,223,007 Communication and information services 1,573,518 45,342 15,357 1,634,217 Other industries 8,725,914 125,725 8,086 8,859,725 Consumer 1,620,206 49,811 23,957 1,693,974 Foreign-excluding MUAH and Krungsri 36,134,401 971,228 189,599 37,295,228 Loans acquired with deteriorated credit quality 16,503 12,572 5,065 34,140 Total ¥ 85,723,317 ¥ 3,145,765 ¥ 491,625 ¥ 89,360,707 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 14,256,263 ¥ 76,185 ¥ 14,332,448 Card ¥ 531,331 ¥ 61,822 ¥ 593,153 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 3,837,763 ¥ 22,949 ¥ 4,879,158 ¥ 133,032 ¥ 151,553 ¥ 9,024,455 Normal Special Substandard or Total (1) (in millions) Krungsri ¥ 4,672,435 ¥ 195,472 ¥ 98,335 ¥ 4,966,242 At September 30, 2017: Normal Close Watch Likely to become Total (1) (in millions) Commercial Domestic ¥ 48,998,517 ¥ 1,832,425 ¥ 314,006 ¥ 51,144,948 Manufacturing 10,741,717 655,748 63,955 11,461,420 Construction 687,938 48,890 10,203 747,031 Real estate 11,198,972 309,827 35,400 11,544,199 Services 2,246,457 198,002 27,211 2,471,670 Wholesale and retail 7,596,267 408,725 89,977 8,094,969 Banks and other financial institutions 4,915,187 11,632 1,404 4,928,223 Communication and information services 1,513,008 44,328 20,585 1,577,921 Other industries 8,497,806 110,830 42,539 8,651,175 Consumer 1,601,165 44,443 22,732 1,668,340 Foreign-excluding MUAH and Krungsri 37,670,119 739,011 118,760 38,527,890 Loans acquired with deteriorated credit quality 14,230 12,576 4,721 31,527 Total ¥ 86,682,866 ¥ 2,584,012 ¥ 437,487 ¥ 89,704,365 Accrual Nonaccrual Total (1) (in millions) Residential ¥ 14,081,156 ¥ 70,189 ¥ 14,151,345 Card ¥ 530,913 ¥ 61,725 ¥ 592,638 Credit Quality Based on Credit Quality Based on Accrual Nonaccrual Pass Special Classified Total (1)(2) (in millions) MUAH ¥ 3,963,344 ¥ 17,136 ¥ 4,612,200 ¥ 74,704 ¥ 133,840 ¥ 8,801,224 Normal Special Substandard or Total (1) (in millions) Krungsri ¥ 4,820,843 ¥ 185,274 ¥ 109,834 ¥ 5,115,951 Notes: (1 ) Total loans in the above table do not include loans held for sale, and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees. (2 ) Total loans of MUAH do not include Federal Deposit Insurance Corporation (“FDIC”) covered loans and small business loans which are not individually rated totaling ¥40,534 million and ¥1,144 million at March 31, 2017 and September 30, 2017, respectively. The MUFG Group will be reimbursed for a substantial portion of any future losses on FDIC covered loans under the terms of the FDIC loss share agreements.
Ages of Past Due Loans by Class [Table Text Block]	At March 31, 2017: 1-3 months Greater Total Current Total (1)(2) Recorded (in millions) Commercial Domestic ¥ 12,410 ¥ 19,468 ¥ 31,878 ¥ 51,999,461 ¥ 52,031,339 ¥ 5,817 Manufacturing 1,427 1,671 3,098 11,765,609 11,768,707 20 Construction 281 235 516 818,168 818,684 — Real estate 2,655 5,058 7,713 11,525,091 11,532,804 1,542 Services 1,294 3,225 4,519 2,531,022 2,535,541 4 Wholesale and retail 1,932 1,883 3,815 7,960,865 7,964,680 149 Banks and other financial institutions 3 21 24 5,222,983 5,223,007 — Communication and information services 583 216 799 1,633,418 1,634,217 — Other industries 337 99 436 8,859,289 8,859,725 — Consumer 3,898 7,060 10,958 1,683,016 1,693,974 4,102 Foreign-excluding MUAH and Krungsri 5,268 50,105 55,373 37,239,855 37,295,228 2,244 Residential 78,227 42,335 120,562 14,202,076 14,322,638 31,382 Card 17,490 31,298 48,788 533,484 582,272 — MUAH 25,162 14,212 39,374 8,998,049 9,037,423 1,165 Krungsri 103,055 73,261 176,316 4,780,709 4,957,025 — Total ¥ 241,612 ¥ 230,679 ¥ 472,291 ¥ 117,753,634 ¥ 118,225,925 ¥ 40,608 At September 30, 2017: 1-3 months Greater Total Current Total (1)(2) Recorded (in millions) Commercial Domestic ¥ 10,742 ¥ 19,953 ¥ 30,695 ¥ 51,114,253 ¥ 51,144,948 ¥ 5,487 Manufacturing 1,370 1,724 3,094 11,458,326 11,461,420 — Construction 639 272 911 746,120 747,031 — Real estate 1,385 3,963 5,348 11,538,851 11,544,199 1,665 Services 1,410 948 2,358 2,469,312 2,471,670 68 Wholesale and retail 1,737 4,687 6,424 8,088,545 8,094,969 78 Banks and other financial institutions — 52 52 4,928,171 4,928,223 31 Communication and information services 740 426 1,166 1,576,755 1,577,921 — Other industries 116 1,674 1,790 8,649,385 8,651,175 — Consumer 3,345 6,207 9,552 1,658,788 1,668,340 3,645 Foreign-excluding MUAH and Krungsri 16,279 21,394 37,673 38,490,217 38,527,890 — Residential 76,176 35,200 111,376 14,030,372 14,141,748 25,813 Card 17,357 31,382 48,739 533,271 582,010 — MUAH 24,640 13,552 38,192 8,745,243 8,783,435 1,792 Krungsri 100,176 77,876 178,052 4,930,290 5,108,342 — Total ¥ 245,370 ¥ 199,357 ¥ 444,727 ¥ 117,843,646 ¥ 118,288,373 ¥ 33,092 Notes: (1 ) Total loans in the above table do not include loans held for sale and loans acquired with deteriorated credit quality and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees. (2 ) Total loans of MUAH do not include ¥438 million and nil of FDIC covered loans at March 31, 2017 and September 30, 2017, respectively, which are not subject to the guidance on loans and debt securities acquired with deteriorated credit quality.
Changes in Allowance for Credit Losses by Portfolio Segment [Table Text Block]	Six months ended September 30, 2016: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Balance at beginning of period ¥ 816,559 ¥ 58,598 ¥ 31,187 ¥ 108,454 ¥ 96,332 ¥ 1,111,130 Provision (credit) for credit losses (94,482 ) 480 6,492 1,526 27,303 (58,681 ) Charge-offs 55,096 3,351 8,050 12,077 23,007 101,581 Recoveries 9,758 941 1,208 736 6,630 19,273 Net charge-offs 45,338 2,410 6,842 11,341 16,377 82,308 Others (1) (17,485 ) 1 — (14,737 ) (12,442 ) (44,663 ) Balance at end of period ¥ 659,254 ¥ 56,669 ¥ 30,837 ¥ 83,902 ¥ 94,816 ¥ 925,478 Six months ended September 30, 2017: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Balance at beginning of period ¥ 900,686 ¥ 67,336 ¥ 30,165 ¥ 73,733 ¥ 110,268 ¥ 1,182,188 Provision (credit) for credit losses (207,025 ) (16,024 ) 10,669 (5,882 ) 31,694 (186,568 ) Charge-offs 55,204 2,238 11,047 9,241 26,274 104,004 Recoveries 12,376 666 695 1,547 8,372 23,656 Net charge-offs 42,828 1,572 10,352 7,694 17,902 80,348 Others (1) 1,709 — — (2,679 ) 1,879 909 Balance at end of period ¥ 652,542 49,740 ¥ 30,482 ¥ 57,478 ¥ 125,939 ¥ 916,181 Note: (1 ) Others are principally comprised of gains or losses from foreign exchange translation.
Allowance for Credit Losses and Recorded Investment in Loans by Portfolio Segment [Table Text Block]	At March 31, 2017: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 772,804 ¥ 46,520 ¥ 20,523 ¥ 19,174 ¥ 19,035 ¥ 878,056 Collectively evaluated for impairment 115,489 19,255 9,632 54,096 91,137 289,609 Loans acquired with deteriorated credit quality 12,393 1,561 10 463 96 14,523 Total ¥ 900,686 ¥ 67,336 ¥ 30,165 ¥ 73,733 ¥ 110,268 ¥ 1,182,188 Loans: Individually evaluated for impairment ¥ 1,349,621 ¥ 125,611 ¥ 71,879 ¥ 93,452 ¥ 65,028 ¥ 1,705,591 Collectively evaluated for impairment 87,976,946 14,197,027 510,393 8,944,409 4,891,997 116,520,772 Loans acquired with deteriorated credit quality 34,140 9,810 10,881 27,128 9,217 91,176 Total (1) ¥ 89,360,707 ¥ 14,332,448 ¥ 593,153 ¥ 9,064,989 ¥ 4,966,242 ¥ 118,317,539 At September 30, 2017: Commercial Residential Card MUAH Krungsri Total (in millions) Allowance for credit losses: Individually evaluated for impairment ¥ 552,727 ¥ 26,412 ¥ 20,457 ¥ 9,957 ¥ 28,345 ¥ 637,898 Collectively evaluated for impairment 86,373 21,702 10,010 47,063 97,524 262,672 Loans acquired with deteriorated credit quality 13,442 1,626 15 458 70 15,611 Total ¥ 652,542 ¥ 49,740 ¥ 30,482 ¥ 57,478 ¥ 125,939 ¥ 916,181 Loans: Individually evaluated for impairment ¥ 1,158,691 ¥ 118,536 ¥ 69,415 ¥ 80,100 ¥ 77,829 ¥ 1,504,571 Collectively evaluated for impairment 88,514,147 14,023,212 512,595 8,703,335 5,030,513 116,783,802 Loans acquired with deteriorated credit quality 31,527 9,597 10,628 18,933 7,609 78,294 Total (1) ¥ 89,704,365 ¥ 14,151,345 ¥ 592,638 ¥ 8,802,368 ¥ 5,115,951 ¥ 118,366,667 Note: (1 ) Total loans in the above table do not include loans held for sale, and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees.

Goodwill and Other Intangible33

Goodwill and Other Intangible Assets [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Movement in Carrying Amount of Goodwill [Table Text Block]	Six months ended 2016 2017 (in millions) Balance at beginning of period Goodwill ¥ 2,539,874 ¥ 2,542,280 Accumulated impairment losses (2,085,499 ) (2,092,137 ) 454,375 450,143 Goodwill recognized during the six months (1) 2,858 — Foreign currency translation adjustments and other (65,132 ) (14,590 ) Balance at end of period Goodwill 2,477,600 2,527,690 Accumulated impairment losses (2,085,499 ) (2,092,137 ) ¥ 392,101 ¥ 435,553 Note: (1 ) See Note 2 for the goodwill recognized in connection with acquisitions.
Carrying Amount of Other Intangible Assets by Major Class [Table Text Block]	March 31, September 30, (in millions) Intangible assets subject to amortization: Software ¥ 711,190 ¥ 713,438 Core deposit intangibles 50,100 46,948 Customer relationships 191,992 171,363 Trade names 49,814 47,932 Other 8,139 10,952 Total 1,011,235 990,633 Intangible assets not subject to amortization: Other 9,124 9,122 Total ¥ 1,020,359 ¥ 999,755

Pledged Assets and Collateral34

Pledged Assets and Collateral [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Assets Mortgaged Pledged or Otherwise Subject to Lien [Table Text Block]	September 30, 2017 (in millions) Trading account securities ¥ 7,975,769 Investment securities 8,328,320 Loans 15,522,796 Other 61,129 Total ¥ 31,888,014
Pledged Assets Classified by Type of Liabilities [Table Text Block]	September 30, 2017 (in millions) Deposits ¥ 316,560 Payables under repurchase agreements and securities lending transactions 12,965,112 Other short-term borrowings and long-term debt 18,569,633 Other 36,709 Total ¥ 31,888,014

Severance Indemnities and Pen35

Severance Indemnities and Pension Plans [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Cost of Pension Benefits, SIPs and Other Benefits [Table Text Block]	Six months ended September 30, Domestic subsidiaries Foreign offices and subsidiaries 2016 2017 2016 2017 Pension benefits and SIPs Pension benefits and SIPs Pension benefits Other benefits Pension benefits Other benefits (in millions) Service cost—benefits earned during the period ¥ 24,453 ¥ 23,539 ¥ 6,701 ¥ 548 ¥ 5,646 ¥ 348 Interest cost on projected benefit obligation 6,232 7,266 8,027 717 7,651 540 Expected return on plan assets (30,126 ) (34,144 ) (15,075 ) (1,066 ) (16,069 ) (1,062 ) Amortization of net actuarial loss 8,870 3,946 9,788 669 5,740 563 Amortization of prior service cost (3,784 ) (580 ) (1,063 ) (427 ) (1,547 ) (1,391 ) Gain on settlements and curtailment (445 ) (2,019 ) — — — — Net periodic benefit cost ¥ 5,200 ¥ (1,992 ) ¥ 8,378 ¥ 441 ¥ 1,421 ¥ (1,002 )
Contributed to Plan Assets and Expected to Contribute for Remainder of Fiscal Year [Table Text Block]	Domestic Foreign offices Pension Pension Other (in billions) For the six months ended September 30, 2017 ¥ 51.3 ¥ 14.8 ¥ 0.2 For the remainder of the fiscal year ending March 31, 2018 ¥ 23.0 ¥ 1.5 ¥ 0.2

Offsetting of Derivatives, Re36

Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Summary of Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions [Table Text Block]	At March 31, 2017 Gross amounts of Gross amounts Net amounts Gross amounts not offset Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 18,835 ¥ — ¥ 18,835 ¥ (15,053 ) ¥ (726 ) ¥ 3,056 Receivables under resale agreements 11,044 (2,856 ) 8,188 (7,461 ) (11 ) 716 Receivables under securities borrowing transactions 11,003 — 11,003 (10,880 ) (9 ) 114 Total ¥ 40,882 ¥ (2,856 ) ¥ 38,026 ¥ (33,394 ) ¥ (746 ) ¥ 3,886 Financial liabilities: Derivative liabilities ¥ 18,562 ¥ — ¥ 18,562 ¥ (15,063 ) ¥ (1,229 ) ¥ 2,270 Payables under repurchase agreements (1) 20,549 (2,856 ) 17,693 (17,489 ) (11 ) 193 Payables under securities lending transactions 5,549 — 5,549 (5,526 ) (8 ) 15 Obligations to return securities received as collateral 3,516 — 3,516 (492 ) — 3,024 Total ¥ 48,176 ¥ (2,856 ) ¥ 45,320 ¥ (38,570 ) ¥ (1,248 ) ¥ 5,502 At September 30, 2017 Gross amounts of recognized assets/liabilities Gross amounts Net amounts Gross amounts not offset Net amounts Financial Cash collateral (in billions) Financial assets: Derivative assets ¥ 16,256 ¥ — ¥ 16,256 ¥ (12,843 ) ¥ (670 ) ¥ 2,743 Receivables under resale agreements 9,676 (2,975 ) 6,701 (6,127 ) (13 ) 561 Receivables under securities borrowing transactions 9,839 — 9,839 (9,723 ) (16 ) 100 Total ¥ 35,771 ¥ (2,975 ) ¥ 32,796 ¥ (28,693 ) ¥ (699 ) ¥ 3,404 Financial liabilities: Derivative liabilities ¥ 16,273 ¥ — ¥ 16,273 ¥ (12,691 ) ¥ (1,539 ) ¥ 2,043 Payables under repurchase agreements (1) 22,057 (2,892 ) 19,165 (18,946 ) (29 ) 190 Payables under securities lending transactions 4,790 — 4,790 (4,757 ) (12 ) 21 Obligations to return securities received as collateral 2,700 — 2,700 (704 ) — 1,996 Total ¥ 45,820 ¥ (2,892 ) ¥ 42,928 ¥ (37,098 ) ¥ (1,580 ) ¥ 4,250 Note: (1 ) Payables under repurchase agreements in the above table include those under long-term repurchase agreements of ¥1,611,916 million and ¥2,046,159 million at March 31, 2017 and September 30, 2017, respectively, which are included in Long-term debt in the accompanying condensed consolidated balance sheets.

Repurchase Agreements, and Se37

Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Gross Obligations by Remaining Contractual Maturity and Class of Collateral Pledged [Table Text Block]	March 31, 2017 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 2,309 ¥ 13,455 ¥ 3,083 ¥ 1,702 ¥ 20,549 Payables under securities lending transactions 1,811 1,970 1,768 — 5,549 Obligations to return securities received as collateral 3,329 102 85 — 3,516 Total ¥ 7,449 ¥ 15,527 ¥ 4,936 ¥ 1,702 ¥ 29,614 September 30, 2017 Remaining Contractual Maturity Overnight 30 days 31-90 Over Total (in billions) Payables under repurchase agreements ¥ 2,436 ¥ 13,967 ¥ 3,320 ¥ 2,334 ¥ 22,057 Payables under securities lending transactions 1,539 1,774 1,477 — 4,790 Obligations to return securities received as collateral 2,468 43 189 — 2,700 Total ¥ 6,443 ¥ 15,784 ¥ 4,986 ¥ 2,334 ¥ 29,547
Secured Borrowing by the Class of Collateral Pledged [Table Text Block]	March 31, 2017 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 2,975 ¥ 5,030 ¥ 2,020 ¥ 10,025 Foreign governments and official institutions bonds 13,195 — 1,101 14,296 Corporate bonds 636 1 117 754 Residential mortgage-backed securities 3,401 — — 3,401 Other debt securities 205 — 3 208 Marketable equity securities 104 518 275 897 Others 33 — — 33 Total ¥ 20,549 ¥ 5,549 ¥ 3,516 ¥ 29,614 September 30, 2017 Payables under Payables under Obligations Total (in billions) Japanese national government and Japanese government agency bonds ¥ 2,244 ¥ 4,014 ¥ 860 ¥ 7,118 Foreign governments and official institutions bonds 15,347 — 1,287 16,634 Corporate bonds 430 2 131 563 Residential mortgage-backed securities 3,840 — — 3,840 Other debt securities 123 — 4 127 Marketable equity securities 37 774 418 1,229 Others 36 — — 36 Total ¥ 22,057 ¥ 4,790 ¥ 2,700 ¥ 29,547

Accumulated Other Comprehensi38

Accumulated Other Comprehensive Income (Loss) [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Changes in Accumulated OCI, Net of Tax and Net of Noncontrolling Interests [Table Text Block]	Six months ended 2016 2017 (in millions) Accumulated other comprehensive income (loss), net of taxes: Net unrealized gains (losses) on investment securities: Balance at beginning of period ¥ 1,995,314 ¥ 2,032,807 Net change during the period (132,427 ) 253,088 Effect of adopting new guidance on consolidation of certain variable interest entities 5,509 — Balance at end of period ¥ 1,868,396 ¥ 2,285,895 Net debt valuation adjustments: Balance at beginning of period ¥ (2,080 ) ¥ (10,632 ) Net change during the period 866 (5,779 ) Balance at end of period ¥ (1,214 ) ¥ (16,411 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Balance at beginning of period ¥ 4,516 ¥ (8,729 ) Net change during the period 19,205 (626 ) Balance at end of period ¥ 23,721 ¥ (9,355 ) Defined benefit plans: Balance at beginning of period ¥ (317,422 ) ¥ (214,062 ) Net change during the period 18,291 24,604 Balance at end of period ¥ (299,131 ) ¥ (189,458 ) Foreign currency translation adjustments: Balance at beginning of period ¥ 620,931 ¥ 482,039 Net change during the period (730,374 ) (37,968 ) Effect of adopting new guidance on consolidation of certain variable interest entities (1,636 ) — Balance at end of period ¥ (111,079 ) ¥ 444,071 Balance at end of period ¥ 1,480,693 ¥ 2,514,742
Before Tax and Net of Tax Changes in Each Component of Accumulated OCI [Table Text Block]	Six months ended September 30, 2016 2017 Before tax Tax (expense) Net of tax Before tax Tax (expense) Net of tax (in millions) Net unrealized gains (losses) on investment securities: Net unrealized gains (losses) on investment securities ¥ (71,019 ) ¥ 19,199 ¥ (51,820 ) ¥ 540,758 ¥ (169,917 ) ¥ 370,841 Reclassification adjustment for gains included in net income before attribution of noncontrolling interests (120,742 ) 38,139 (82,603 ) (175,398 ) 52,011 (123,387 ) Net change (191,761 ) 57,338 (134,423 ) 365,360 (117,906 ) 247,454 Net unrealized losses on investment securities attributable to noncontrolling interests (1,996 ) (5,634 ) Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group (132,427 ) 253,088 Net debt valuation adjustments: Net debt valuation adjustments 1,158 (364 ) 794 (8,218 ) 2,516 (5,702 ) Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests 105 (33 ) 72 (111 ) 34 (77 ) Net change 1,263 (397 ) 866 (8,329 ) 2,550 (5,779 ) Net debt valuation adjustments attributable to noncontrolling interests — — Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group 866 (5,779 ) Net unrealized gains (losses) on derivatives qualifying for cash flow hedges: Net unrealized gains on derivatives qualifying for cash flow hedges 41,833 (16,752 ) 25,081 4,450 (1,641 ) 2,809 Reclassification adjustment for gains included in net income before attribution of noncontrolling interests (9,678 ) 3,802 (5,876 ) (5,584 ) 2,149 (3,435 ) Net change 32,155 (12,950 ) 19,205 (1,134 ) 508 (626 ) Net unrealized gains on derivatives qualifying for cash flow hedges attributable to noncontrolling interests — — Net unrealized gains (losses) on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group 19,205 (626 ) Defined benefit plans: Defined benefit plans 15,910 (6,798 ) 9,112 31,778 (10,240 ) 21,538 Reclassification adjustment for losses included in net income before attribution of noncontrolling interests 13,598 (4,340 ) 9,258 4,659 (1,588 ) 3,071 Net change 29,508 (11,138 ) 18,370 36,437 (11,828 ) 24,609 Defined benefit plans attributable to noncontrolling interests 79 5 Defined benefit plans attributable to Mitsubishi UFJ Financial Group 18,291 24,604 Foreign currency translation adjustments: Foreign currency translation adjustments (833,911 ) 72,740 (761,171 ) (35,954 ) (2,932 ) (38,886 ) Reclassification adjustment for losses included in net income before attribution of noncontrolling interests 2,641 (464 ) 2,177 2,961 — 2,961 Net change (831,270 ) 72,276 (758,994 ) (32,993 ) (2,932 ) (35,925 ) Foreign currency translation adjustments attributable to noncontrolling interests (28,620 ) 2,043 Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group (730,374 ) (37,968 ) Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group ¥ (824,439 ) ¥ 233,319
Reclassification of Significant Items out of Accumulated OCI [Table Text Block]	Six months ended 2016 2017 Details of Accumulated OCI components Amount reclassified out of Line items in the consolidated statements of income (in millions) Net unrealized losses (gains) on investment securities Net gains on sales and redemptions of Available-for-sale ¥ (153,607 ) ¥ (181,530 ) Investment securities gains—net Other 32,865 6,132 (120,742 ) (175,398 ) Total before tax 38,139 52,011 Income tax expense ¥ (82,603 ) ¥ (123,387 ) Net of tax Net debt valuation adjustments ¥ 105 ¥ (111 ) Equity in earnings of equity method investees—net 105 (111 ) Total before tax (33 ) 34 Income tax expense ¥ 72 ¥ (77 ) Net of tax Net unrealized losses (gains) on derivatives qualifying for cash flow hedges Interest rate contracts ¥ (9,642 ) ¥ (5,471 ) Interest income on Loans, including fees Other (36 ) (113 ) (9,678 ) (5,584 ) Total before tax 3,802 2,149 Income tax expense ¥ (5,876 ) ¥ (3,435 ) Net of tax Defined benefit plans Net actuarial loss (1) ¥ 19,327 ¥ 10,249 Prior service cost (1) (5,273 ) (3,518 ) Loss (gain) on settlements and curtailment, and other (1) (456 ) (2,072 ) 13,598 4,659 Total before tax (4,340 ) (1,588 ) Income tax expense ¥ 9,258 ¥ 3,071 Net of tax Foreign currency translation adjustments ¥ 2,641 ¥ 2,961 Other non-interest 2,641 2,961 Total before tax (464 ) — Income tax expense ¥ 2,177 ¥ 2,961 Net of tax Total reclassifications for the period ¥ (114,076 ) ¥ (173,473 ) Total before tax 37,104 52,606 Income tax expense ¥ (76,972 ) ¥ (120,867 ) Net of tax Note: (1 ) These Accumulated OCI components are included in the computation of net periodic benefit cost. See Note 7 for more information.

Noncontrolling Interests _Tex39

Noncontrolling Interests [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Noncontrolling Interest [Abstract]
Effect on MUFG's Shareholders' Equity from Changes in Ownership of Subsidiaries [Table Text Block]	Six months ended 2016 2017 (in millions) Net income attributable to Mitsubishi UFJ Financial Group ¥ 750,883 ¥ 790,704 Transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders: Purchase of shares of Mitsubishi UFJ NICOS from noncontrolling interest shareholder (Note 2) — (34,751 ) Other — 54 Net transfers to the noncontrolling interest shareholders — (34,697 ) Change from net income attributable to Mitsubishi UFJ Financial Group and transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders ¥ 750,883 ¥ 756,007

Derivative Financial Instrume40

Derivative Financial Instruments [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amounts of Derivative Contracts [Table Text Block]	Notional amounts (1) March 31, September 30, (in trillions) Interest rate contracts ¥ 1,252.7 ¥ 1,240.5 Foreign exchange contracts 216.9 222.6 Equity contracts 4.7 6.7 Commodity contracts 0.5 0.4 Credit derivatives 6.0 6.2 Others 4.3 4.2 Total ¥ 1,485.1 ¥ 1,480.6 Note: (1) Includes both written and purchased positions.
Fair Value Information on Derivative Instruments Recorded on Condensed Consolidated Balance Sheets [Table Text Block]	Fair value of derivative instruments March 31, 2017 (1)(5) September 30, 2017 (1)(5) Not designated (2) Designated (3) Total (4) Not designated (2) Designated (3) Total (4) (in billions) Derivative assets: Interest rate contracts ¥ 14,240 ¥ 2 ¥ 14,242 ¥ 12,210 ¥ 1 ¥ 12,211 Foreign exchange contracts 4,301 — 4,301 3,742 — 3,742 Equity contracts 188 — 188 206 — 206 Commodity contracts 35 — 35 29 — 29 Credit derivatives 67 — 67 67 — 67 Others 2 — 2 1 — 1 Total derivative assets ¥ 18,833 ¥ 2 ¥ 18,835 ¥ 16,255 ¥ 1 ¥ 16,256 Derivative liabilities: Interest rate contracts ¥ 14,305 ¥ 23 ¥ 14,328 ¥ 12,245 ¥ 20 ¥ 12,265 Foreign exchange contracts 4,084 — 4,084 3,752 — 3,752 Equity contracts 182 — 182 253 — 253 Commodity contracts 31 — 31 27 — 27 Credit derivatives 58 — 58 68 — 68 Others (6) (121 ) — (121 ) (92 ) — (92 ) Total derivative liabilities ¥ 18,539 ¥ 23 ¥ 18,562 ¥ 16,253 ¥ 20 ¥ 16,273 Notes: (1) The fair value of derivative instruments is presented on a gross basis even when derivative instruments are subject to master netting agreements. Cash collateral payable and receivable associated with derivative instruments are not added to or netted against the fair value amounts. (2) The derivative instruments which are not designated as a hedging instrument are held for trading and risk management purposes, and are presented in Trading account assets/liabilities except for (6). (3) The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered into by MUAH. The derivative instruments which are designated as hedging instruments are presented in Other assets or Other liabilities on the accompanying condensed consolidated balance sheets. (4) This table does not include contracts with embedded derivatives for which the fair value option has been elected. (5) For more information about fair value measurement and assumptions used to measure the fair value of derivatives, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. (6) Others include mainly bifurcated embedded derivatives carried at fair value, which are presented in Deposits and Long-term debt.
Gains and Losses for Trading and Risk Management Derivatives (Not Designated as Hedging Instruments) [Table Text Block]	Trading and risk management derivatives gains and losses Foreign exchange Trading account Total (in billions) Six months ended September 30, 2016: Interest rate contracts ¥ — ¥ 67 ¥ 67 Foreign exchange contracts 179 — 179 Equity contracts — (20 ) (20 ) Commodity contracts — 1 1 Credit derivatives — 13 13 Others 2 (20 ) (18 ) Total ¥ 181 ¥ 41 ¥ 222 Six months ended September 30, 2017: Interest rate contracts ¥ — ¥ (8 ) ¥ (8 ) Foreign exchange contracts (158 ) — (158 ) Equity contracts — (146 ) (146 ) Commodity contracts — — — Credit derivatives — (1 ) (1 ) Others (1 ) (38 ) (39 ) Total ¥ (159 ) ¥ (193 ) ¥ (352 )
Gains and Losses for Derivatives Designated as Cash Flow Hedges [Table Text Block]	Six months ended September 30, 2016 2017 (in billions) Gains recognized in Accumulated OCI on derivative instruments (Effective portion) Interest rate contracts ¥ 46 ¥ 4 Total ¥ 46 ¥ 4 Gains reclassified from Accumulated OCI into income (Effective portion) Interest rate contracts (1) ¥ 10 ¥ 6 Total ¥ 10 ¥ 6 Note: (1) Included in Interest income.
Protection Sold Through Credit Default Swaps [Table Text Block]	Protection sold Maximum potential/Notional amount Fair value At March 31, 2017: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 627,355 ¥ 949,129 ¥ 29,493 ¥ 1,605,977 ¥ (21,005 ) Non-investment 107,663 349,886 6,580 464,129 1,654 Not rated 5,973 5,981 — 11,954 (516 ) Total 740,991 1,304,996 36,073 2,082,060 (19,867 ) Index and basket credit default swaps held by BTMU: Investment grade (2) 7,000 198,335 63,767 269,102 (4,145 ) Non-investment 17,000 52,145 21,316 90,461 (837 ) Total 24,000 250,480 85,083 359,563 (4,982 ) Index and basket credit default swaps held by MUSHD: Investment grade (2) 14,000 72,192 1,000 87,192 (1,278 ) Non-investment 21,000 73,000 — 94,000 (1,725 ) Not rated 16,228 194,533 — 210,761 (11,734 ) Total 51,228 339,725 1,000 391,953 (14,737 ) Total index and basket credit default swaps sold 75,228 590,205 86,083 751,516 (19,719 ) Total credit default swaps sold 816,219 1,895,201 122,156 2,833,576 (39,586 ) Other credit derivatives sold (3) Investment grade — 78,553 — 78,553 — Total credit derivatives ¥ 816,219 ¥ 1,973,754 ¥ 122,156 ¥ 2,912,129 ¥ (39,586 ) Protection sold Maximum potential/Notional amount by Fair value At September 30, 2017: 1 year 1-5 years Over Total (Asset)/ (1) (in millions) Single name credit default swaps: Investment grade (2) ¥ 542,236 ¥ 995,380 ¥ 65,303 ¥ 1,602,919 ¥ (26,542 ) Non-investment 151,212 303,399 6,790 461,401 (2,283 ) Not rated 2,245 3,937 — 6,182 (262 ) Total 695,693 1,302,716 72,093 2,070,502 (29,087 ) Index and basket credit default swaps held by BTMU: Investment grade (2) 18,000 81,624 104,041 203,665 (4,191 ) Non-investment 3,000 63,129 10,146 76,275 (978 ) Total 21,000 144,753 114,187 279,940 (5,169 ) Index and basket credit default swaps held by MUSHD: Investment grade (2) 21,000 106,763 23,500 151,263 (3,146 ) Non-investment 15,000 45,000 — 60,000 (1,206 ) Not rated 31,135 239,376 897 271,408 (16,300 ) Total 67,135 391,139 24,397 482,671 (20,652 ) Total index and basket credit default swaps sold 88,135 535,892 138,584 762,611 (25,821 ) Total credit default swaps sold 783,828 1,838,608 210,677 2,833,113 (54,908 ) Other credit derivatives sold (3) Investment grade — 78,911 — 78,911 5 Total credit derivatives ¥ 783,828 ¥ 1,917,519 ¥ 210,677 ¥ 2,912,024 ¥ (54,903 ) Notes: (1) Fair value amounts are shown on a gross basis prior to cash collateral or counterparty netting. (2) The MUFG Group considers ratings of Baa3/BBB- (3) Other credit derivatives primarily consist of total return swaps.

Obligations under Guarantees 41

Obligations under Guarantees and Other Off-balance Sheet Instruments [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Text Block [Abstract]
Contractual or Notional Amounts of Guarantees [Table Text Block]	March 31, September 30, (in billions) Standby letters of credit and financial guarantees ¥ 3,775 ¥ 3,878 Performance guarantees 2,968 3,079 Derivative instruments (1)(2) 44,249 43,752 Liabilities of trust accounts 9,561 9,253 Others 5 — Total ¥ 60,558 ¥ 59,962 Notes: (1) Credit derivatives sold by the MUFG Group are excluded from this presentation. (2) Derivative instruments that are deemed to be included within the definition of guarantees as prescribed in the guidance on guarantees include certain written options and credit default swaps.
Maximum Potential Amount of Future Payments Classified Based upon Internal Credit Ratings [Table Text Block]	At March 31, 2017: Maximum Amount by borrower grade Normal Close (1) Likely to (2) Not rated (in billions) Standby letters of credit and financial guarantees ¥ 3,775 ¥ 3,629 ¥ 119 ¥ 24 ¥ 3 Performance guarantees 2,968 2,831 96 11 30 Total ¥ 6,743 ¥ 6,460 ¥ 215 ¥ 35 ¥ 33 At September 30, 2017: Maximum Amount by borrower grade Normal Close (1) Likely to (2) Not rated (in billions) Standby letters of credit and financial guarantees ¥ 3,878 ¥ 3,771 ¥ 86 ¥ 19 ¥ 2 Performance guarantees 3,079 2,891 131 32 25 Total ¥ 6,957 ¥ 6,662 ¥ 217 ¥ 51 ¥ 27 Notes: (1 ) Borrowers classified as Close Watch represent those that require close monitoring as the borrower has begun to exhibit elements of potential concern with respect to its business performance and financial condition, the borrower has begun to exhibit elements of serious concern with respect to its business performance and financial condition, including business problems requiring long-term solutions, or the borrower’s loans are TDRs or loans contractually past due 90 days or more for special reasons. (2 ) Borrowers classified as Likely to become Bankrupt or Legally/Virtually Bankrupt represent those that have a higher probability of default than those categorized as Close Watch due to serious debt repayment problems with poor progress in achieving restructuring plans, the borrower being considered virtually bankrupt with no prospects for an improvement in business operations, or the borrower being legally bankrupt with no prospects for continued business operations because of non-payment,
Contractual Amounts with Regard to Other Off-balance Sheet Instruments [Table Text Block]	March 31, September 30, (in billions) Commitments to extend credit ¥ 84,334 ¥ 81,788 Commercial letters of credit 1,214 1,282 Commitments to make investments 135 143 Other 13 13

Variable Interest Entities _T42

Variable Interest Entities [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Consolidated VIEs [Member]
Assets and Liabilities of Variable Interest Entities [Table Text Block]	Consolidated VIEs Consolidated assets At March 31, 2017: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 7,332,485 ¥ 48,688 ¥ 34,690 ¥ 23,423 ¥ 1,485,377 ¥ 5,733,202 ¥ 7,105 Investment funds 712,694 — 9,020 511,924 15,611 — 176,139 Special purpose entities created for structured financing 226,380 — 2,310 — — 172,008 52,062 Repackaged instruments 77,211 — — 20,783 56,428 — — Securitization of the MUFG Group’s assets (1) 6,798,561 — — — — 6,775,344 23,217 Trust arrangements 6,749,808 — 7,681 593 149,205 6,578,701 13,628 Others 65,883 350 30,853 — 52 16,905 17,723 Total consolidated assets before elimination 21,963,022 49,038 84,554 556,723 1,706,673 19,276,160 289,874 The amounts eliminated in consolidation (6,789,161 ) (48,852 ) (72,506 ) (16,914 ) (69,086 ) (6,562,970 ) (18,833 ) Total consolidated assets ¥ 15,173,861 ¥ 186 ¥ 12,048 ¥ 539,809 ¥ 1,637,587 ¥ 12,713,190 ¥ 271,041 Consolidated liabilities Total Deposits Other Long-term All other (in millions) Asset-backed conduits ¥ 7,357,874 ¥ — ¥ 5,397,811 ¥ 1,379,498 ¥ 580,565 Investment funds 2,882 — — — 2,882 Special purpose entities created for structured financing 135,667 — 573 128,804 6,290 Repackaged instruments 76,713 — 4,000 72,096 617 Securitization of the MUFG Group’s assets (1) 6,768,108 — 29,637 6,734,855 3,616 Trust arrangements 6,743,464 6,676,198 — — 67,266 Others 65,031 — 45,450 1,834 17,747 Total consolidated liabilities before elimination 21,149,739 6,676,198 5,477,471 8,317,087 678,983 The amounts eliminated in consolidation (10,843,144 ) — (3,034,973 ) (7,766,722 ) (41,449 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,687,133 ) (6,676,198 ) (2,420,454 ) (2,394 ) (588,087 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 619,462 ¥ — ¥ 22,044 ¥ 547,971 ¥ 49,447 Consolidated VIEs Consolidated assets At September 30, 2017: Total Cash and Interest-earning Trading Investment Loans All other (in millions) Asset-backed conduits ¥ 7,409,619 ¥ 30,602 ¥ 21,099 ¥ 7,251 ¥ 1,600,634 ¥ 5,742,584 ¥ 7,449 Investment funds 804,668 — 6,521 557,165 13,512 — 227,470 Special purpose entities created for structured financing 210,698 — 1,964 — — 159,922 48,812 Repackaged instruments 112,879 — — 16,638 96,241 — — Securitization of the MUFG Group’s assets (1) 11,335,610 — — — — 11,310,184 25,426 Trust arrangements 6,604,632 — 8,381 317 153,134 6,423,380 19,420 Others 51,047 351 19,036 — 42 14,891 16,727 Total consolidated assets before elimination 26,529,153 30,953 57,001 581,371 1,863,563 23,650,961 345,304 The amounts eliminated in consolidation (6,584,806 ) (30,762 ) (39,774 ) (6,161 ) (79,385 ) (6,407,979 ) (20,745 ) Total consolidated assets ¥ 19,944,347 ¥ 191 ¥ 17,227 ¥ 575,210 ¥ 1,784,178 ¥ 17,242,982 ¥ 324,559 Consolidated liabilities Total Deposits Other Long-term All other (in millions) Asset-backed conduits ¥ 7,424,800 ¥ — ¥ 5,304,961 ¥ 1,477,059 ¥ 642,780 Investment funds 55,828 — — — 55,828 Special purpose entities created for structured financing 125,498 — 314 121,152 4,032 Repackaged instruments 111,951 — 13,194 94,531 4,226 Securitization of the MUFG Group’s assets (1) 11,302,407 — 29,849 11,266,685 5,873 Trust arrangements 6,597,674 6,520,112 — — 77,562 Others 50,008 — 31,514 1,736 16,758 Total consolidated liabilities before elimination 25,668,166 6,520,112 5,379,832 12,961,163 807,059 The amounts eliminated in consolidation (15,403,314 ) — (2,976,786 ) (12,374,752 ) (51,776 ) The amount of liabilities with recourse to the general credit of the MUFG Group (9,523,327 ) (6,520,112 ) (2,363,352 ) (585 ) (639,278 ) Liabilities of consolidated VIEs for which creditors or beneficial interest holders do not have recourse to the general credit of the MUFG Group ¥ 741,525 ¥ — ¥ 39,694 ¥ 585,826 ¥ 116,005 Note: (1 ) Securitization of the MUFG Group’s assets includes ¥5,793,956 million and ¥10,387,311 million of assets primarily consisting of loans and the same amounts of liabilities primarily consisting of long-term debt relating to eligible beneficiary interests in housing loan trusts as of March 31, 2017 and September 30, 2017, respectively. For more information, see analysis of each transaction category in Note 26 to the consolidated financial statements for the fiscal year ended March 31, 2017.
Non-consolidated VIEs [Member]
Assets and Liabilities of Variable Interest Entities [Table Text Block]	Non-consolidated On-balance On-balance sheet At March 31, 2017: Total assets Maximum Total Trading Investment Loans All other Total All other (in millions) Asset-backed conduits ¥ 29,604,929 ¥ 5,608,909 ¥ 4,383,707 ¥ 1,072 ¥ 1,236,094 ¥ 3,146,541 ¥ — ¥ 1 ¥ 1 Investment funds 30,591,880 1,674,567 1,396,830 200,651 829,641 356,828 9,710 98 98 Special purpose entities created for structured financing 40,710,546 4,717,235 3,699,415 279,471 147,543 3,207,369 65,032 4,657 4,657 Repackaged instruments 10,127,497 2,269,149 2,104,697 581,912 1,203,181 294,703 24,901 — — Others 52,012,087 3,731,571 2,723,625 98,289 83,629 2,462,462 79,245 18,539 18,539 Total ¥ 163,046,939 ¥ 18,001,431 ¥ 14,308,274 ¥ 1,161,395 ¥ 3,500,088 ¥ 9,467,903 ¥ 178,888 ¥ 23,295 ¥ 23,295 Non-consolidated VIEs On-balance On-balance sheet At September 30, 2017: Total assets Maximum Total Trading Investment Loans All other Total All other (in millions) Asset-backed conduits ¥ 29,441,674 ¥ 5,828,075 ¥ 4,605,800 ¥ 1,053 ¥ 1,391,427 ¥ 3,213,320 ¥ — ¥ 1 ¥ 1 Investment funds 36,442,349 1,588,251 1,410,293 297,533 723,493 381,111 8,156 206 206 Special purpose entities created for structured financing 41,923,186 4,637,770 3,643,692 335,081 150,068 3,110,595 47,948 6,581 6,581 Repackaged instruments 8,964,605 2,173,225 2,094,314 844,913 973,966 251,656 23,779 — — Others 60,417,928 3,900,145 2,815,983 122,003 62,180 2,557,884 73,916 18,998 18,998 Total ¥ 177,189,742 ¥ 18,127,466 ¥ 14,570,082 ¥ 1,600,583 ¥ 3,301,134 ¥ 9,514,566 ¥ 153,799 ¥ 25,786 ¥ 25,786

Business Segments _Text Block_

Business Segments [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Financial Information by Business Segment [Table Text Block]	Customer Business Retail Corporate (1) Global (1) Trust Total (1) Global Other Total (in billions) Six months ended September 30, 2016: Net revenue: ¥ 584.0 ¥ 495.6 ¥ 578.1 ¥ 82.6 ¥ 1,661.6 ¥ 348.4 ¥ 5.2 ¥ 2,015.2 BTMU and MUTB: 243.0 403.6 200.7 35.1 836.2 256.9 71.6 1,164.7 Net interest income 168.2 162.9 92.2 — 404.9 93.1 127.7 625.7 Net fees 71.5 196.2 87.0 35.1 376.1 (2.6 ) (44.8 ) 328.7 Other 3.3 44.5 21.5 — 55.2 166.4 (11.3 ) 210.3 Other than BTMU and MUTB (2) 341.0 92.0 377.4 47.5 825.4 91.5 (66.4 ) 850.5 Operating expenses 479.7 282.8 372.3 52.9 1,118.7 101.3 79.0 1,299.0 Operating profit (loss) ¥ 104.3 ¥ 212.8 ¥ 205.8 ¥ 29.7 ¥ 542.9 ¥ 247.1 ¥ (73.8 ) ¥ 716.2 Six months ended September 30, 2017: Net revenue: ¥ 599.8 ¥ 480.4 ¥ 633.6 ¥ 91.3 ¥ 1,712.3 ¥ 319.8 ¥ 28.3 ¥ 2,060.4 BTMU and MUTB: 233.5 390.7 219.8 41.9 827.3 223.9 58.4 1,109.6 Net interest income 165.9 162.4 112.3 — 411.0 68.5 112.9 592.4 Net fees 64.9 187.0 86.8 41.9 366.2 (9.5 ) (38.6 ) 318.1 Other 2.7 41.3 20.7 — 50.1 164.9 (15.9 ) 199.1 Other than BTMU and MUTB (2) 366.3 89.7 413.8 49.4 885.0 95.9 (30.1 ) 950.8 Operating expenses 474.9 290.2 426.7 57.5 1,172.9 112.6 86.1 1,371.6 Operating profit (loss) ¥ 124.9 ¥ 190.2 ¥ 206.9 ¥ 33.8 ¥ 539.4 ¥ 207.2 ¥ (57.8 ) ¥ 688.8 Notes: (1) Net revenue, operating expenses, and operating profit relating to the overseas Japanese Corporate business were ¥78.7 billion, ¥69.0 billion, and ¥9.7 billion for the six months ended September 30, 2016, and ¥92.8 billion, ¥76.4 billion, and ¥16.4 billion for the six months ended September 30, 2017, respectively. To eliminate the double-counting of these amounts, adjustments have been made to the Total of Customer Business. These amounts have been restated in accordance with the modifications resulting in the restatement of the prior period business segment information. (2) Includes MUFG and its subsidiaries other than BTMU on a stand-alone basis and MUTB on a stand-alone basis.
Reconciliation of Operating Profit (Loss) from Segments to Condensed Consolidated Statements of Income [Table Text Block]	Six months ended 2016 2017 (in billions) Operating profit ¥ 716 ¥ 689 Credit for credit losses 59 187 Foreign exchange gains—net 1 23 Trading account profits (losses)—net 105 (50 ) Equity investment securities gains—net 73 95 Debt investment securities losses—net (36 ) (5 ) Equity in earnings of equity method investees—net 128 89 Other—net (40 ) (14 ) Income before income tax expense ¥ 1,006 ¥ 1,014

Fair Value _Text Block_ (Tables

Fair Value [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value by Level on Recurring Basis [Table Text Block]	At March 31, 2017 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 10,646,728 ¥ 11,027,560 ¥ 799,493 ¥ 22,473,781 Debt securities Japanese national government and Japanese government agency bonds 1,794,233 390,147 — 2,184,380 Japanese prefectural and municipal bonds — 136,226 — 136,226 Foreign governments and official institutions bonds 7,764,734 466,151 1,836 8,232,721 Corporate bonds — 3,305,520 25,521 3,331,041 Residential mortgage-backed securities — 4,816,323 47,914 4,864,237 Asset-backed securities — 280,502 654,814 935,316 Other debt securities — 5,155 35,552 40,707 Commercial paper — 1,084,421 — 1,084,421 Equity securities (2) 1,087,761 543,115 33,856 1,664,732 Trading derivative assets 112,687 18,619,331 101,100 18,833,118 Interest rate contracts 27,321 14,174,526 38,188 14,240,035 Foreign exchange contracts 9,661 4,270,548 20,455 4,300,664 Equity contracts 75,545 88,154 24,707 188,406 Commodity contracts 160 18,740 17,745 36,645 Credit derivatives — 67,363 5 67,368 Investment securities: Available-for-sale 30,214,302 8,538,271 337,526 39,090,099 Debt securities Japanese national government and Japanese government agency bonds 23,053,677 2,772,611 — 25,826,288 Japanese prefectural and municipal bonds — 1,015,489 — 1,015,489 Foreign governments and official institutions bonds 1,360,060 769,770 20,099 2,149,929 Corporate bonds — 1,104,800 36,932 1,141,732 Residential mortgage-backed securities — 1,188,903 15 1,188,918 Commercial mortgage-backed securities — 77,297 2,971 80,268 Asset-backed securities — 1,261,353 116,919 1,378,272 Other debt securities — 10,199 160,590 170,789 Marketable equity securities 5,800,565 337,849 — 6,138,414 Other investment securities — — 26,292 26,292 Others (3)(4) 453,214 37,942 3,850 495,006 Total ¥ 41,426,931 ¥ 38,223,104 ¥ 1,268,261 ¥ 80,918,296 Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 128,292 ¥ 1,392 ¥ — ¥ 129,684 Trading derivative liabilities 135,342 18,461,252 63,855 18,660,449 Interest rate contracts 45,539 14,249,439 9,637 14,304,615 Foreign exchange contracts 5,219 4,072,787 5,597 4,083,603 Equity contracts 84,514 66,482 31,019 182,015 Commodity contracts 70 14,730 17,375 32,175 Credit derivatives — 57,814 227 58,041 Obligation to return securities received as collateral 3,423,936 92,296 — 3,516,232 Others (5) — 376,724 28,432 405,156 Total ¥ 3,687,570 ¥ 18,931,664 ¥ 92,287 ¥ 22,711,521 At September 30, 2017 Level 1 Level 2 Level 3 Fair Value (in millions) Assets Trading account assets: Trading securities (1) ¥ 12,437,573 ¥ 11,698,694 ¥ 981,130 ¥ 25,117,397 Debt securities Japanese national government and Japanese government agency bonds 1,681,251 470,475 1,075 2,152,801 Japanese prefectural and municipal bonds — 104,280 — 104,280 Foreign governments and official institutions bonds 9,292,742 468,019 900 9,761,661 Corporate bonds — 3,274,382 33,551 3,307,933 Residential mortgage-backed securities — 5,282,911 46,214 5,329,125 Asset-backed securities — 399,664 826,699 1,226,363 Other debt securities — — 35,630 35,630 Commercial paper — 1,093,750 — 1,093,750 Equity securities (2) 1,463,580 605,213 37,061 2,105,854 Trading derivative assets 93,551 16,065,597 96,258 16,255,406 Interest rate contracts 9,912 12,165,012 34,608 12,209,532 Foreign exchange contracts 1,813 3,723,066 16,944 3,741,823 Equity contracts 81,788 98,783 26,027 206,598 Commodity contracts 38 12,084 18,679 30,801 Credit derivatives — 66,652 — 66,652 Investment securities: Available-for-sale 27,150,763 9,356,429 320,338 36,827,530 Debt securities Japanese national government and Japanese government agency bonds 19,530,854 2,977,769 — 22,508,623 Japanese prefectural and municipal bonds — 1,250,611 — 1,250,611 Foreign governments and official institutions bonds 1,562,500 719,042 20,109 2,301,651 Corporate bonds — 1,106,288 6,778 1,113,066 Residential mortgage-backed securities — 1,460,064 15 1,460,079 Commercial mortgage-backed securities — 79,986 2,884 82,870 Asset-backed securities — 1,368,242 137,411 1,505,653 Other debt securities — 9,945 153,141 163,086 Marketable equity securities 6,057,409 384,482 — 6,441,891 Other investment securities — — 25,564 25,564 Others (3)(4) 791,644 46,059 6,728 844,431 Total ¥ 40,473,531 ¥ 37,166,779 ¥ 1,430,018 ¥ 79,070,328 Liabilities Trading account liabilities: Trading securities sold, not yet purchased ¥ 71,580 ¥ 1,166 ¥ — ¥ 72,746 Trading derivative liabilities 160,783 16,118,563 66,692 16,346,038 Interest rate contracts 19,542 12,210,073 15,681 12,245,296 Foreign exchange contracts 1,265 3,745,399 5,553 3,752,217 Equity contracts 139,975 86,514 26,888 253,377 Commodity contracts 1 9,268 18,356 27,625 Credit derivatives — 67,309 214 67,523 Obligation to return securities received as collateral 2,593,258 106,654 — 2,699,912 Others (5) — 480,968 31,615 512,583 Total ¥ 2,825,621 ¥ 16,707,351 ¥ 98,307 ¥ 19,631,279 Notes: (1) Includes securities measured under the fair value option. (2) Excludes certain investments valued at net asset value of private equity funds, whose fair values at March 31, 2017 were ¥13,150 million, and those at September 30, 2017 were ¥17,308 million, respectively. The amounts of unfunded commitments related to these private equity funds at March 31, 2017 were ¥27,735 million, and those at September 30, 2017 were ¥44,670 million, respectively. For the nature and details of private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. (3) Mainly comprises securities received as collateral that may be sold or repledged under securities lending transactions, money in trust for segregating cash deposited by customers on security transactions and derivative assets designated as hedging instruments. (4) Excludes certain investments valued at net asset value of real estate funds and private equity funds, whose fair values at March 31, 2017 were ¥41 million, and ¥119 million, respectively, and those at September 30, 2017 were nil, and ¥149 million, respectively. For the nature and details of real estate funds and private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. (5) Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments.
Transfers between Level 1 and Level 2 [Table Text Block]	Six months ended September 30, 2016 2017 Transfers out of (1) Transfers out of (1) Transfers out of (1) Transfers out of (1) (in millions) Assets Investment securities: Available-for-sale Marketable equity securities ¥ 20,689 ¥ 4,578 ¥ 1,981 ¥ 3,839 Note: (1) All transfers between Level 1 and Level 2 were assumed to have occurred at the beginning of the period.
Reconciliation of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Level 3 Inputs [Table Text Block]	Total gains (losses) Change in liabilities March 31, Included Included Purchases Issues Sales Settlements Transfers (5) Transfers (5) September 30, (in millions) Assets Trading account assets: Trading securities (1) ¥ 879,946 ¥ (86,056 ) (2) ¥ — ¥ 136,497 ¥ — ¥ (67,356 ) ¥ (118,887 ) ¥ 48,105 ¥ (26,875 ) ¥ 765,374 ¥ (80,271 ) (2) Debt securities Japanese national government and Japanese government agency bonds — (1,203 ) — — — — — 11,315 — 10,112 (1,203 ) Japanese prefectural and municipal bonds 2,467 84 — — — (2,551 ) — — — — — Foreign governments and official institutions bonds 57,470 (5,793 ) — 16,168 — (16,302 ) (50,611 ) — (6 ) 926 (132 ) Corporate bonds 98,236 (5,524 ) — 2,063 — (1,058 ) (55,571 ) 36,790 (6) (26,869 ) (6) 48,067 (5,098 ) Residential mortgage-backed securities 23,540 (9,188 ) — 38,086 — — (3,956 ) — — 48,482 (8,817 ) Asset-backed securities 630,247 (61,503 ) — 79,336 — (47,445 ) (7,914 ) — — 592,721 (61,717 ) Other debt securities 35,944 (3,807 ) — — — — — — — 32,137 (3,807 ) Equity securities 32,042 878 — 844 — — (835 ) — — 32,929 503 Trading derivatives—net 31,254 6,608 (2) (911 ) 544 (417 ) — (7,722 ) 1,535 (3,134 ) 27,757 14,318 (2) Interest rate contracts—net 38,213 (496 ) (597 ) — — — (4,428 ) 1,139 (817 ) 33,014 3,205 Foreign exchange contracts—net 1,235 417 105 477 (10 ) — (1,289 ) 396 (2,354 ) (1,023 ) 1,231 Equity contracts—net (7,915 ) 7,279 (384 ) 56 (56 ) — (2,125 ) — 37 (3,108 ) 9,678 Commodity contracts—net (345 ) (250 ) (18 ) 11 (351 ) — 97 — — (856 ) 415 Credit derivatives—net 66 (342 ) (17 ) — — — 23 — — (270 ) (211 ) Investment securities: Available-for-sale 375,274 (1,944 ) (3) (49,778 ) 138,693 — (42 ) (156,705 ) 39 (5,681 ) 299,856 151 (3) Debt securities Foreign governments and official institutions bonds 20,941 — (2,674 ) 258 — — (255 ) — — 18,270 — Corporate bonds 23,595 408 (513 ) 9,086 — (42 ) (4,964 ) 39 (6) (5,681 ) (6) 21,928 151 Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed securities 3,764 — (400 ) — — — (43 ) — — 3,321 — Asset-backed securities 158,281 (2,352 ) (21,435 ) 120,722 — — (142,666 ) — — 112,550 — Other debt securities 168,678 — (24,756 ) 8,627 — — (8,777 ) — — 143,772 — Other investment securities 24,689 2,487 (4) — 2,077 — (3,162 ) (13 ) — — 26,078 (301 ) (4) Others 846 (175 ) (4) (140 ) 448 — (25 ) — 1,454 — 2,408 (328 ) (4) Total ¥ 1,312,009 ¥ (79,080 ) ¥ (50,829 ) ¥ 278,259 ¥ (417 ) ¥ (70,585 ) ¥ (283,327 ) ¥ 51,133 ¥ (35,690 ) ¥ 1,121,473 ¥ (66,431 ) Liabilities Others ¥ (9,821 ) ¥ 4,188 (4) ¥ 5,993 ¥ — ¥ 837 ¥ — ¥ (8,530 ) ¥ 6,791 ¥ (15,678 ) ¥ (36,582 ) ¥ 6,001 (4) Total ¥ (9,821 ) ¥ 4,188 ¥ 5,993 ¥ — ¥ 837 ¥ — ¥ (8,530 ) ¥ 6,791 ¥ (15,678 ) ¥ (36,582 ) ¥ 6,001 Total gains (losses) Change in unrealized gains (losses) included in earnings for assets and liabilities March 31, Included Included Purchases Issues Sales Settlements Transfers (5) Transfers (5) September 30, (in millions) Assets Trading account assets: Trading securities (1) ¥ 799,493 ¥ 18,075 (2) ¥ — ¥ 522,384 ¥ — ¥ (128,188 ) ¥ (240,479 ) ¥ 20,416 ¥ (10,571 ) ¥ 981,130 ¥ 18,905 (2) Debt securities Japanese national government and Japanese government agency bonds — (4 ) — 1,079 — — — — — 1,075 (4 ) Foreign governments and official institutions bonds 1,836 341 — 37,112 — (37,369 ) (47 ) — (973 ) 900 69 Corporate bonds 25,521 (1,979 ) — 3,170 — (533 ) (3,347 ) 20,317 (6) (9,598 ) (6) 33,551 (1,957 ) Residential mortgage-backed securities 47,914 2,344 — — — — (4,044 ) — — 46,214 2,306 Asset-backed securities 654,814 16,454 — 476,136 — (88,454 ) (232,251 ) — — 826,699 18,037 Other debt securities 35,552 78 — — — — — — — 35,630 79 Equity securities 33,856 841 — 4,887 — (1,832 ) (790 ) 99 — 37,061 375 Trading derivatives—net 37,245 7,470 (2) 133 568 (1,385 ) — (13,829 ) 1,817 (2,453 ) 29,566 10,436 (2) Interest rate contracts—net 28,551 (303 ) (93 ) — — — (6,231 ) (3,399 ) 402 18,927 400 Foreign exchange contracts—net 14,858 (5,533 ) 115 235 (228 ) — 189 5,216 (3,461 ) 11,391 (2,516 ) Equity contracts—net (6,312 ) 13,082 112 332 (794 ) — (7,887 ) — 606 (861 ) 11,710 Commodity contracts—net 370 261 (1 ) 1 (363 ) — 55 — — 323 880 Credit derivatives—net (222 ) (37 ) — — — — 45 — — (214 ) (38 ) Investment securities: Available-for-sale 337,526 2,053 (3) (10,705 ) 139,993 — (30 ) (118,202 ) 93 (30,390 ) 320,338 (69 ) (3) Debt securities Foreign governments and official institutions bonds 20,099 — (184 ) 248 — — (54 ) — — 20,109 — Corporate bonds 36,932 115 (17 ) 521 — (30 ) (446 ) 93 (6) (30,390 ) (6) 6,778 (69 ) Residential mortgage-backed securities 15 — — — — — — — — 15 — Commercial mortgage-backed securities 2,971 — (49 ) — — — (38 ) — — 2,884 — Asset-backed securities 116,919 1,938 (4,971 ) 139,224 — — (115,699 ) — — 137,411 — Other debt securities 160,590 — (5,484 ) — — — (1,965 ) — — 153,141 — Other investment securities 26,292 (648 ) (4) — 1,366 — (1,194 ) — — (252 ) 25,564 (1,280 ) (4) Others 3,850 (275 ) (4) (121 ) 3,277 — (3 ) — — — 6,728 (362 ) (4) Total ¥ 1,204,406 ¥ 26,675 ¥ (10,693 ) ¥ 667,588 ¥ (1,385 ) ¥ (129,415 ) ¥ (372,510 ) ¥ 22,326 ¥ (43,666 ) ¥ 1,363,326 ¥ 27,630 Liabilities Others ¥ 28,432 ¥ (24,919 ) (4) ¥ (595 ) ¥ — ¥ 4,243 ¥ — ¥ (13,055 ) ¥ 1,888 ¥ (15,407 ) ¥ 31,615 ¥ (18,694 ) (4) Total ¥ 28,432 ¥ (24,919 ) ¥ (595 ) ¥ — ¥ 4,243 ¥ — ¥ (13,055 ) ¥ 1,888 ¥ (15,407 ) ¥ 31,615 ¥ (18,694 ) Notes: (1 ) Includes Trading securities measured under the fair value option. (2 ) Included in Trading account profits—net and in Foreign exchange losses—net. (3 ) Included in Investment securities gains—net. (4 ) Included in Trading account profits—net. (5 ) All transfers out of Level 3 or into Level 3 were assumed to have occurred at the beginning of the period. (6 ) Transfers into (out of) Level 3 for corporate bonds were mainly caused by the decrease (increase) in liquidity.
Quantitative Information about Level 3 Fair Value Measurements [Table Text Block]	At March 31, 2017 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign governments and official institutions bonds ¥ 20,099 Return on equity method Probability of default 0.1%~0.4% 0.3 % Recovery rate 60.0%~70.0% 67.0 % Market-required return on capital 8.0%~10.0% 9.0 % Corporate bonds 19,313 Discounted cash flow Probability of default 4.4%~8.8% 5.6 % Recovery rate 41.0%~81.2% 42.8 % Residential mortgage-backed securities, Commercial mortgage-backed securities and Asset-backed securities 108,132 Discounted cash flow Probability of default 1.2%~5.3% 4.3 % Recovery rate 60.0%~76.0% 64.7 % 650,814 Internal model (4) Asset correlations 7.0%~11.0% 11.0 % Discount factor 1.2%~1.4% 1.2 % Prepayment rate 9.5%~29.5% 29.3 % Probability of default 0.0%~83.1% — (3) Recovery rate 52.8%~80.9% 80.6 % Other debt securities 35,552 Discounted cash flow Liquidity premium 0.5%~1.0% 0.6 % 160,479 Return on equity method Probability of default 0.0%~25.0% 0.3 % Recovery rate 40.0%~90.0% 71.1 % Market-required return on capital 8.0%~10.0% 9.7 % At March 31, 2017 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net 28,297 Option model Probability of default 0.1%~13.2% Correlation between interest rates 36.0%~100.0% Correlation between interest rate and foreign exchange rate 20.4%~48.8% Recovery rate 41.0%~48.0% Volatility 21.6%~100.0% Foreign exchange contracts—net 14,890 Option model Probability of default 0.1%~8.7% Correlation between interest rates 40.3%~74.0% Correlation between interest rate and foreign exchange rate 46.4%~50.7% Correlation between underlying assets 85.0% Recovery rate 41.0%~48.0% Volatility 16.8%~20.6% Equity contracts—net (6,659 ) Option model Correlation between interest rate and equity 33.3%~39.0% Correlation between foreign exchange rate and equity 3.0%~69.2% Correlation between equities 25.5%~81.3% Volatility 29.8%~127.4% At September 30, 2017 Fair value (1) Valuation technique Significant unobservable inputs Range Weighted (2) (in millions) Assets Trading securities and Investment securities: Foreign governments and official institutions bonds ¥ 20,109 Return on equity method Probability of default 0.1%~0.4% 0.3 % Recovery rate 60.0%~70.0% 66.7 % Market-required return on capital 8.0%~10.0% 9.5 % Corporate bonds 3,323 Discounted cash flow Probability of default 8.1% 8.1 % Recovery rate 41.0%~68.3% 45.9 % Residential mortgage- 124,629 Discounted cash flow Probability of default 1.2%~5.3% 4.4 % Recovery rate 60.0%~76.0% 67.1 % 826,699 Internal model (4) Asset correlations 11.0% 11.0 % Discount factor 1.1% 1.1 % Prepayment rate 40.5% 40.5 % Probability of default 0.0%~87.9% — (3) Recovery rate 71.5% 71.5 % Other debt securities 35,630 Discounted cash flow Liquidity premium 0.5%~1.0% 0.6 % 153,030 Return on equity method Probability of default 0.0%~25.0% 0.4 % Recovery rate 40.0%~90.0% 71.6 % Market-required return on capital 8.0%~10.0% 9.7 % At September 30, 2017 Fair value (1) Valuation technique Significant unobservable inputs Range (in millions) Trading derivatives—net: Interest rate contracts—net 18,732 Option model Probability of default 0.0%~12.6% Correlation between interest rates 35.7%~51.4% Correlation between interest rate and foreign exchange rate 20.9%~51.5% Recovery rate 41.0%~48.0% Volatility 18.9%~100.0% Probability of prepayment 100.0% Foreign exchange contracts—net 11,424 Option model Probability of default 0.0%~12.6% Correlation between interest rates 40.3%~74.0% Correlation between interest rate and foreign exchange rate 46.4%~50.7% Correlation between underlying assets 85.0% Recovery rate 41.0%~48.0% Volatility 12.3%~17.8% Equity contracts—net (5,598 ) Option model Correlation between interest rate and equity 13.7%~39.0% Correlation between foreign exchange rate and equity 3.0%~68.5% Correlation between equities 21.8%~82.9% 5,313 Discounted cash flow Term of litigation 2.5 years Notes: (1 ) The fair value as of March 31, 2017 and September 30, 2017 excludes the fair value of investments valued using vendor prices. (2 ) Weighted averages are calculated by weighing each input by the relative fair value of the respective financial instruments. (3 ) See “Probability of default” in “Sensitivity to and range of unobservable inputs” in Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017. (4 ) For further detail of Internal model, refer to the last paragraph of “Trading Account Assets and Liabilities—Trading Account Securities” in Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.
Carrying Value of Assets Measured at Fair Value on Nonrecurring Basis by Level [Table Text Block]	March 31, 2017 September 30, 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in millions) Assets Investment securities (1) ¥ — ¥ — ¥ 2,224 ¥ 2,224 ¥ — ¥ — ¥ 1,397 ¥ 1,397 Loans 4,941 9,020 219,963 233,924 4,746 12,179 258,715 275,640 Loans held for sale — — 6,480 6,480 — — 25,339 25,339 Collateral dependent loans 4,941 9,020 213,483 227,444 4,746 12,179 233,376 250,301 Premises and equipment — — 3,507 3,507 — — 7,960 7,960 Intangible assets — — 1,652 1,652 — — 8,458 8,458 Goodwill — — 4,869 4,869 — — — — Other assets — — 6,872 6,872 92,223 — 3,841 96,064 Investments in equity method investees (1) — — — — 92,223 — — 92,223 Other — — 6,872 6,872 — — 3,841 3,841 Total ¥ 4,941 ¥ 9,020 ¥ 239,087 ¥ 253,048 ¥ 96,969 ¥ 12,179 ¥ 280,371 ¥ 389,519 Note: (1 ) Excludes certain investments valued at net asset value of ¥15,884 million and ¥10,340 million at March 31, 2017 and September 30, 2017, respectively. The unfunded commitments related to these investments are ¥5,359 million and ¥1,167 million at March 31, 2017 and September 30, 2017, respectively. These investments are in private equity funds. For the nature and details of private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.
Losses (Gains) Recorded as a Result of Changes in Fair Value Measured on a Nonrecurring Basis [Table Text Block]	Losses for the 2016 2017 (in millions) Investment securities ¥ 388 ¥ 284 Loans 32,889 25,781 Loans held for sale 343 249 Collateral dependent loans 32,546 25,532 Premises and equipment 4,706 6,227 Intangible assets 968 16,591 Other assets 2,271 28,395 Investments in equity method investees 1,820 27,985 Other 451 410 Total ¥ 41,222 ¥ 77,278
Gains (Losses) Related to Instruments for which Fair Value Option was Elected [Table Text Block]	Six months ended September 30, 2016 2017 Trading Foreign Total Trading Foreign Total (in millions) Financial assets: Trading account securities ¥ 153,101 ¥ (2,446,921 ) ¥ (2,293,820 ) ¥ 90,632 ¥ 460,947 ¥ 551,579 Total ¥ 153,101 ¥ (2,446,921 ) ¥ (2,293,820 ) ¥ 90,632 ¥ 460,947 ¥ 551,579 Financial liabilities: Other short-term borrowings (1) ¥ (7,129 ) ¥ — ¥ (7,129 ) ¥ 2,054 ¥ — ¥ 2,054 Long-term debt (1) (100,379 ) — (100,379 ) 1,172 — 1,172 Total ¥ (107,508 ) ¥ — ¥ (107,508 ) ¥ 3,226 ¥ — ¥ 3,226 Note: (1) Change in value attributable to the instrument-specific credit risk related to those financial liabilities are not material.
Differences between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding [Table Text Block]	March 31, 2017 September 30, 2017 Remaining Fair value Fair value Remaining Fair value Fair value (in millions) Financial liabilities: Long-term debt ¥ 404,510 ¥ 377,423 ¥ (27,087 ) ¥ 369,452 ¥ 348,196 ¥ (21,256 ) Total ¥ 404,510 ¥ 377,423 ¥ (27,087 ) ¥ 369,452 ¥ 348,196 ¥ (21,256 )
Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments Not Carried at Fair Value on Recurring Basis on Condensed Consolidated Balance Sheets by Level [Table Text Block]	At March 31, 2017 Carrying Estimated fair value Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 25,683 ¥ 25,683 ¥ 25,683 ¥ — ¥ — Interest-earning deposits in other banks 38,327 38,327 — 38,327 — Call loans and funds sold 704 704 — 704 — Receivables under resale agreements 8,188 8,188 — 8,188 — Receivables under securities borrowing transactions 11,003 11,003 — 11,003 — Investment securities (1)(2) 3,688 3,808 1,206 1,144 1,458 Loans, net of allowance for credit losses (3) 117,033 118,765 5 257 118,503 Other financial assets (4) 5,827 5,827 — 5,827 — Financial liabilities: Deposits Non-interest-bearing ¥ 29,486 ¥ 29,486 ¥ — ¥ 29,486 ¥ — Interest-bearing 160,928 160,948 — 160,948 — Total deposits 190,414 190,434 — 190,434 — Call money and funds purchased 1,975 1,975 — 1,975 — Payables under repurchase agreements 16,081 16,081 — 16,081 — Payables under securities lending transactions 5,549 5,549 — 5,549 — Due to trust account 3,335 3,335 — 3,335 — Other short-term borrowings 7,857 7,857 — 7,857 — Long-term debt 27,475 27,627 — 27,627 — Other financial liabilities 6,094 6,094 — 6,094 — At September 30, 2017 Carrying Estimated fair value Total Level 1 Level 2 Level 3 (in billions) Financial assets: Cash and due from banks ¥ 30,987 ¥ 30,987 ¥ 30,987 ¥ — ¥ — Interest-earning deposits in other banks 39,128 39,128 — 39,128 — Call loans and funds sold 757 757 — 757 — Receivables under resale agreements 6,701 6,701 — 6,701 — Receivables under securities borrowing transactions 9,839 9,839 — 9,839 — Investment securities (1)(2) 3,330 3,449 1,201 1,106 1,142 Loans, net of allowance for credit losses (3) 117,319 118,767 5 261 118,501 Other financial assets (4) 7,372 7,372 — 7,372 — Financial liabilities: Deposits Non-interest-bearing ¥ 28,367 ¥ 28,367 ¥ — ¥ 28,367 ¥ — Interest-bearing 163,430 163,440 — 163,440 — Total deposits 191,797 191,807 — 191,807 — Call money and funds purchased 2,529 2,529 — 2,529 — Payables under repurchase agreements 17,119 17,119 — 17,119 — Payables under securities lending transactions 4,790 4,790 — 4,790 — Due to trust account 3,088 3,088 — 3,088 — Other short-term borrowings 8,037 8,037 — 8,037 — Long-term debt 29,866 30,028 — 30,028 — Other financial liabilities 6,952 6,952 — 6,952 — Notes: (1) Includes impaired securities measured at fair value on a nonrecurring basis. Refer to “Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis” for the details of the level classification. (2) Excludes cost-method investments of ¥429 billion and ¥430 billion at March 31, 2017 and September 30, 2017, respectively, of which the MUFG Group did not estimate the fair value since it was not practical and no impairment indicators were identified. See Note 3 for the details of these cost-method investments. (3) Includes loans held for sale and collateral dependent loans measured at fair value on a nonrecurring basis. Refer to “Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis” for the details of the level classification. (4) Excludes investments in equity method investees of ¥2,200 billion and ¥2,216 billion at March 31, 2017 and September 30, 2017, respectively.

Investments in Equity Method 45

Investments in Equity Method Investees [Text Block] (Tables)	6 Months Ended
	Sep. 30, 2017
Morgan Stanley [Member]
Summarized Operating Results of Morgan Stanley [Table Text Block]	2016 2017 (in billions) Net revenues ¥ 1,876 ¥ 2,077 Total non-interest 1,364 1,508 Income from continuing operations before income taxes 512 569 Net income applicable to Morgan Stanley 335 393

Business Developments (Narrativ

Business Developments (Narrative) (Detail) - JPY (¥) ¥ in Millions	Oct. 02, 2017	May 15, 2017	Oct. 04, 2016	Oct. 03, 2016	Sep. 12, 2016	Apr. 30, 2016	Apr. 01, 2016	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016
Business Developments [Line Items]
Goodwill								¥ 450,143	¥ 435,553	¥ 392,101	¥ 454,375
Liability recognized in Other liabilities								6,755,165	7,794,424
Reduction in Noncontrolling interests								(779,176)	(728,189)
Reduction in Capital surplus								(5,956,644)	(5,820,198)
Increase in Accumulated other comprehensive income, net of taxes								2,281,423	¥ 2,514,742	¥ 1,480,693
BTMU's Acquisition of Security Bank Corporation's Shares [Member]
Business Developments [Line Items]
Approximate percentage of aggregated equity interest after acquisition							20.00%
Amount of equity interest for acquisition							¥ 91,993
MUTB's Acquisition of Capital Analytics II LLC [Member]
Business Developments [Line Items]
Percentage of ownership acquired						100.00%
Business acquisition in cash						¥ 4,494
Goodwill						2,858
Amount of intangible assets, other than goodwill, recorded on acquisitions						¥ 1,388
Amount of measurement period adjustment for goodwill applied to the acquisition date fair value								¥ (115)
Krungsri's Acquisition of Hattha Kaksekar Limited [Member]
Business Developments [Line Items]
Percentage of ownership acquired					100.00%
Business acquisition in cash					¥ 15,703
Goodwill					8,280
Amount of intangible assets, other than goodwill, recorded on acquisitions					¥ 476
MUFG's Acquisition of Hitachi Capital Corporation's Shares [Member]
Business Developments [Line Items]
Approximate percentage of aggregated equity interest after acquisition				23.00%
Amount of equity interest for acquisition				¥ 91,877
MUTB's Acquisition of Rydex Fund Services, LLC [Member]
Business Developments [Line Items]
Percentage of ownership acquired			100.00%
Business acquisition in cash			¥ 17,431
Goodwill			5,232
Amount of intangible assets, other than goodwill, recorded on acquisitions			¥ 11,507
Mitsubishi UFJ NICOS Becomes a Wholly-Owned Subsidiary [Member]
Business Developments [Line Items]
Percentage of ownership acquired		15.02%
Amount of equity interest for acquisition		¥ 50,000
Liability recognized in Other liabilities		50,000
Reduction in Noncontrolling interests		15,390
Reduction in Capital surplus		34,751
Increase in Accumulated other comprehensive income, net of taxes		¥ 141
Mitsubishi UFJ NICOS Becomes a Wholly-Owned Subsidiary [Member] | Subsequent Event [Member]
Business Developments [Line Items]
Business acquisition in cash	¥ 50,000

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017	Mar. 31, 2016
Investment Securities [Line Items]
Other investment securities	¥ 555,250		¥ 556,161
Aggregate costs of cost-method investments, not estimated at the fair value	430,311		429,313
Other-than-temporary impairment ("OTTI") losses recognized on cost-method investments	284	¥ 394
Gross realized gains on sales of Available-for-sale securities	189,782	175,065
Gross realized losses on sales of Available-for-sale securities	14,041	22,291
Other-than-temporary impairment ("OTTI") losses of investment securities included in Investment securities gains-net	6,428	32,364
Cumulative declines in fair value of the credit impaired debt securities	3,200	3,850
Credit loss components of impairment losses recognized in earnings	3,830	5,809	4,125	¥ 6,691
Other factors of impairment losses recognized in Accumulated OCI before taxes	¥ 630	1,959
Number of months that fair value of the investment has been below cost to be deemed as other-than-temporary	6 months
Percentage of decline in fair value of investment below cost set as an indicator for classifying investments as an other-than-temporary decline in fair value	20.00%
Japanese National Government and Japanese Government Agency Bonds [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities
Foreign Governments and Official Institutions Bonds [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities
Residential Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities
Commercial Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities
Asset-backed Securities [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities
Other Debt Securities [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities
Marketable Equity Securities [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities included in Investment securities gains-net	6,036	31,913
Debt Securities [Member]
Investment Securities [Line Items]
Other-than-temporary impairment ("OTTI") losses of investment securities included in Investment securities gains-net	108	¥ 57
Fair Value Estimated by Commonly Accepted Valuation Techniques [Member]
Investment Securities [Line Items]
Cost-method investments	97,774		97,774
Test Performed to Determine Existence of Any Impairment Indicators [Member]
Investment Securities [Line Items]
Cost-method investments	431,912		432,095
Carried at Cost [Member]
Investment Securities [Line Items]
Other investment securities	529,686		529,869
Estimated Fair Value [Member]
Investment Securities [Line Items]
Other investment securities	¥ 25,564		¥ 26,292

Investment Securities (Amortize

Investment Securities (Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-for-sale Securities and Held-to-maturity Securities) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2017		Mar. 31, 2017
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	¥ 32,668,042		¥ 35,295,934
Available-for-sale securities, Gross unrealized gains	4,220,682		3,859,750
Available-for-sale securities, Gross unrealized losses	61,194		65,585
Available-for-sale securities, Fair value	36,827,530		39,090,099
Held-to-maturity securities, Amortized cost	3,230,851		3,587,321
Held-to-maturity securities, Gross unrealized gains	56,359		62,579
Held-to-maturity securities, Gross unrealized losses	9,401		12,149
Held-to-maturity securities, Fair value	3,277,809		3,637,751
Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	22,226,590		25,435,570
Available-for-sale securities, Gross unrealized gains	289,182		396,057
Available-for-sale securities, Gross unrealized losses	7,149		5,339
Available-for-sale securities, Fair value	22,508,623		25,826,288
Held-to-maturity securities, Amortized cost	1,100,892		1,100,955
Held-to-maturity securities, Gross unrealized gains	40,268		43,115
Held-to-maturity securities, Fair value	1,141,160		1,144,070
Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	1,248,562		1,010,336
Available-for-sale securities, Gross unrealized gains	6,912		9,598
Available-for-sale securities, Gross unrealized losses	4,863		4,445
Available-for-sale securities, Fair value	1,250,611		1,015,489
Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	2,312,548		2,162,897
Available-for-sale securities, Gross unrealized gains	15,203		14,006
Available-for-sale securities, Gross unrealized losses	26,100		26,974
Available-for-sale securities, Fair value	2,301,651		2,149,929
Held-to-maturity securities, Amortized cost	58,633		61,135
Held-to-maturity securities, Gross unrealized gains	881		1,113
Held-to-maturity securities, Fair value	59,514		62,248
Debt Securities [Member] | Corporate Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	1,098,500		1,121,967
Available-for-sale securities, Gross unrealized gains	15,770		20,854
Available-for-sale securities, Gross unrealized losses	1,204		1,089
Available-for-sale securities, Fair value	1,113,066		1,141,732
Held-to-maturity securities, Amortized cost	50		100
Held-to-maturity securities, Fair value	50		100
Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	1,470,166		1,203,685
Available-for-sale securities, Gross unrealized gains	983		551
Available-for-sale securities, Gross unrealized losses	11,070		15,318
Available-for-sale securities, Fair value	1,460,079		1,188,918
Held-to-maturity securities, Amortized cost	932,328		962,492
Held-to-maturity securities, Gross unrealized gains	3,985		4,009
Held-to-maturity securities, Gross unrealized losses	8,686	[1]	11,196	[2]
Held-to-maturity securities, Fair value	927,627		955,305
Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | MUAH [Member]
Investment Securities [Line Items]
Unrealized losses before taxes at the date of reclassification from Available-for-sale securities to Held-to-maturity securities remaining in Accumulated other comprehensive income (loss)	3,963		4,662
Debt Securities [Member] | Commercial Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	82,618		80,564
Available-for-sale securities, Gross unrealized gains	694		454
Available-for-sale securities, Gross unrealized losses	442		750
Available-for-sale securities, Fair value	82,870		80,268
Held-to-maturity securities, Amortized cost	174,223		184,336
Held-to-maturity securities, Gross unrealized gains	5,237		5,065
Held-to-maturity securities, Gross unrealized losses	636	[1]	768	[2]
Held-to-maturity securities, Fair value	178,824		188,633
Debt Securities [Member] | Commercial Mortgage-backed Securities [Member] | MUAH [Member]
Investment Securities [Line Items]
Unrealized losses before taxes at the date of reclassification from Available-for-sale securities to Held-to-maturity securities remaining in Accumulated other comprehensive income (loss)	6,453		7,295
Debt Securities [Member] | Asset-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	1,500,616		1,374,754
Available-for-sale securities, Gross unrealized gains	6,274		5,416
Available-for-sale securities, Gross unrealized losses	1,237		1,898
Available-for-sale securities, Fair value	1,505,653		1,378,272
Held-to-maturity securities, Amortized cost	964,725		1,278,303
Held-to-maturity securities, Gross unrealized gains	5,988		9,277
Held-to-maturity securities, Gross unrealized losses	79		185
Held-to-maturity securities, Fair value	970,634		1,287,395
Debt Securities [Member] | Other Debt Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	161,044	[3]	169,185	[4]
Available-for-sale securities, Gross unrealized gains	4,309	[3]	4,899	[4]
Available-for-sale securities, Gross unrealized losses	2,267	[3]	3,295	[4]
Available-for-sale securities, Fair value	163,086	[3]	170,789	[4]
Debt Securities [Member] | Other Debt Securities [Member] | Private Placement Debt Conduit Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value	153,030		160,479
Marketable Equity Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Amortized cost	2,567,398		2,736,976
Available-for-sale securities, Gross unrealized gains	3,881,355		3,407,915
Available-for-sale securities, Gross unrealized losses	6,862		6,477
Available-for-sale securities, Fair value	¥ 6,441,891		¥ 6,138,414
[1]	MUAH reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale securities to Held-to-maturity securities during the fiscal year ended March 31, 2014. As a result of the reclassification of residential mortgage-backed securities and commercial mortgage-backed securities, the unrealized losses before taxes at the date of reclassification remaining in Accumulated OCI in the accompanying condensed consolidated balance sheets were ¥3,963 million and ¥6,453 million, respectively, at September 30, 2017 and are not included in the table above.
[2]	MUFG Americas Holdings Corporation ("MUAH") reclassified residential mortgage-backed securities and commercial mortgage-backed securities from Available-for-sale securities to Held-to-maturity securities during the fiscal year ended March 31, 2014. As a result of the reclassification of residential mortgage-backed securities and commercial mortgage-backed securities, the unrealized losses before taxes at the date of reclassification remaining in Accumulated other comprehensive income (loss) ("Accumulated OCI") in the accompanying condensed consolidated balance sheets were ¥4,662 million and ¥7,295 million, respectively, at March 31, 2017 and are not included in the table above.
[3]	Other debt securities in the table above include ¥153,030 million of private placement debt conduit bonds.
[4]	Other debt securities in the table above include ¥160,479 million of private placement debt conduit bonds.

Investment Securities (Amorti49

Investment Securities (Amortized Cost and Fair Value by Contractual Maturity) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2017	Mar. 31, 2017
Held-to-maturity debt securities, Amortized cost:
Due in one year or less	¥ 50
Due from one year to five years	164,798
Due from five years to ten years	1,706,867
Due after ten years	1,359,136
Held-to-maturity debt securities, Amortized cost	3,230,851	¥ 3,587,321
Held-to-maturity debt securities, Fair value:
Due in one year or less	50
Due from one year to five years	168,113
Due from five years to ten years	1,750,883
Due after ten years	1,358,763
Held-to-maturity debt securities, Fair value	3,277,809	¥ 3,637,751
Available-for-sale debt securities, Fair value:
Due in one year or less	12,477,989
Due from one year to five years	9,181,806
Due from five years to ten years	4,353,645
Due after ten years	4,372,199
Available-for-sale debt securities, Fair value	¥ 30,385,639

Investment Securities (Investme

Investment Securities (Investments by Length and Category in Continuous Loss Position) (Detail) ¥ in Millions	Sep. 30, 2017JPY (¥)Securities	Mar. 31, 2017JPY (¥)Securities
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 11,737,749	¥ 9,124,571
Available-for-sale securities, Gross unrealized losses, Less than 12 months	54,951	61,434
Available-for-sale securities, Fair value, 12 months or more	478,613	392,800
Available-for-sale securities, Gross unrealized losses, 12 months or more	6,243	4,151
Available-for-sale securities, Fair value	12,216,362	9,517,371
Available-for-sale securities, Gross unrealized losses	¥ 61,194	¥ 65,585
Available-for-sale securities, Number of securities | Securities	1,275	1,247
Held-to-maturity securities, Fair value, Less than 12 months	¥ 586,661	¥ 561,822
Held-to-maturity securities, Gross unrealized losses, Less than 12 months	8,812	10,874
Held-to-maturity securities, Fair value, 12 months or more	331,646	431,522
Held-to-maturity securities, Gross unrealized losses, 12 months or more	589	1,275
Held-to-maturity securities, Fair value	918,307	993,344
Held-to-maturity securities, Gross unrealized losses	¥ 9,401	¥ 12,149
Held-to-maturity securities, Number of securities | Securities	314	299
Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 8,258,526	¥ 6,088,856
Available-for-sale securities, Gross unrealized losses, Less than 12 months	6,306	5,339
Available-for-sale securities, Fair value, 12 months or more	85,561
Available-for-sale securities, Gross unrealized losses, 12 months or more	843
Available-for-sale securities, Fair value	8,344,087	6,088,856
Available-for-sale securities, Gross unrealized losses	¥ 7,149	¥ 5,339
Available-for-sale securities, Number of securities | Securities	149	107
Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 790,305	¥ 579,684
Available-for-sale securities, Gross unrealized losses, Less than 12 months	4,641	4,445
Available-for-sale securities, Fair value, 12 months or more	16,963
Available-for-sale securities, Gross unrealized losses, 12 months or more	222
Available-for-sale securities, Fair value	807,268	579,684
Available-for-sale securities, Gross unrealized losses	¥ 4,863	¥ 4,445
Available-for-sale securities, Number of securities | Securities	205	139
Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 1,271,852	¥ 1,034,336
Available-for-sale securities, Gross unrealized losses, Less than 12 months	24,457	26,677
Available-for-sale securities, Fair value, 12 months or more	130,981	115,053
Available-for-sale securities, Gross unrealized losses, 12 months or more	1,643	297
Available-for-sale securities, Fair value	1,402,833	1,149,389
Available-for-sale securities, Gross unrealized losses	¥ 26,100	¥ 26,974
Available-for-sale securities, Number of securities | Securities	120	142
Debt Securities [Member] | Corporate Bonds [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 310,254	¥ 277,394
Available-for-sale securities, Gross unrealized losses, Less than 12 months	1,093	933
Available-for-sale securities, Fair value, 12 months or more	21,342	15,613
Available-for-sale securities, Gross unrealized losses, 12 months or more	111	156
Available-for-sale securities, Fair value	331,596	293,007
Available-for-sale securities, Gross unrealized losses	¥ 1,204	¥ 1,089
Available-for-sale securities, Number of securities | Securities	152	160
Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 762,855	¥ 754,557
Available-for-sale securities, Gross unrealized losses, Less than 12 months	9,868	14,086
Available-for-sale securities, Fair value, 12 months or more	151,497	81,065
Available-for-sale securities, Gross unrealized losses, 12 months or more	1,202	1,232
Available-for-sale securities, Fair value	914,352	835,622
Available-for-sale securities, Gross unrealized losses	¥ 11,070	¥ 15,318
Available-for-sale securities, Number of securities | Securities	441	412
Held-to-maturity securities, Fair value, Less than 12 months	¥ 519,945	¥ 523,237
Held-to-maturity securities, Gross unrealized losses, Less than 12 months	8,616	10,736
Held-to-maturity securities, Fair value, 12 months or more	141,542	161,453
Held-to-maturity securities, Gross unrealized losses, 12 months or more	70	460
Held-to-maturity securities, Fair value	661,487	684,690
Held-to-maturity securities, Gross unrealized losses	¥ 8,686	¥ 11,196
Held-to-maturity securities, Number of securities | Securities	280	263
Debt Securities [Member] | Commercial Mortgage-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 41,785	¥ 51,360
Available-for-sale securities, Gross unrealized losses, Less than 12 months	441	748
Available-for-sale securities, Fair value, 12 months or more	1,136	1,298
Available-for-sale securities, Gross unrealized losses, 12 months or more	1	2
Available-for-sale securities, Fair value	42,921	52,658
Available-for-sale securities, Gross unrealized losses	¥ 442	¥ 750
Available-for-sale securities, Number of securities | Securities	47	65
Held-to-maturity securities, Fair value, Less than 12 months	¥ 11,672	¥ 12,906
Held-to-maturity securities, Gross unrealized losses, Less than 12 months	140	125
Held-to-maturity securities, Fair value, 12 months or more	161,175	168,724
Held-to-maturity securities, Gross unrealized losses, 12 months or more	496	643
Held-to-maturity securities, Fair value	172,847	181,630
Held-to-maturity securities, Gross unrealized losses	¥ 636	¥ 768
Held-to-maturity securities, Number of securities | Securities	31	31
Debt Securities [Member] | Asset-backed Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 232,469	¥ 80,059
Available-for-sale securities, Gross unrealized losses, Less than 12 months	1,126	1,269
Available-for-sale securities, Fair value, 12 months or more	14,186	128,372
Available-for-sale securities, Gross unrealized losses, 12 months or more	111	629
Available-for-sale securities, Fair value	246,655	208,431
Available-for-sale securities, Gross unrealized losses	¥ 1,237	¥ 1,898
Available-for-sale securities, Number of securities | Securities	61	85
Held-to-maturity securities, Fair value, Less than 12 months	¥ 55,044	¥ 25,679
Held-to-maturity securities, Gross unrealized losses, Less than 12 months	56	13
Held-to-maturity securities, Fair value, 12 months or more	28,929	101,345
Held-to-maturity securities, Gross unrealized losses, 12 months or more	23	172
Held-to-maturity securities, Fair value	83,973	127,024
Held-to-maturity securities, Gross unrealized losses	¥ 79	¥ 185
Held-to-maturity securities, Number of securities | Securities	3	5
Debt Securities [Member] | Other Debt Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 12,055	¥ 35,375
Available-for-sale securities, Gross unrealized losses, Less than 12 months	184	1,488
Available-for-sale securities, Fair value, 12 months or more	56,414	50,845
Available-for-sale securities, Gross unrealized losses, 12 months or more	2,083	1,807
Available-for-sale securities, Fair value	68,469	86,220
Available-for-sale securities, Gross unrealized losses	¥ 2,267	¥ 3,295
Available-for-sale securities, Number of securities | Securities	22	26
Marketable Equity Securities [Member]
Investment Securities [Line Items]
Available-for-sale securities, Fair value, Less than 12 months	¥ 57,648	¥ 222,950
Available-for-sale securities, Gross unrealized losses, Less than 12 months	6,835	6,449
Available-for-sale securities, Fair value, 12 months or more	533	554
Available-for-sale securities, Gross unrealized losses, 12 months or more	27	28
Available-for-sale securities, Fair value	58,181	223,504
Available-for-sale securities, Gross unrealized losses	¥ 6,862	¥ 6,477
Available-for-sale securities, Number of securities | Securities	78	111

Investment Securities (Roll-for

Investment Securities (Roll-forward of Credit Loss Component Recognized in Earnings) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Roll-forward of credit loss component recognized in earnings:
Balance at beginning of period	¥ 4,125	¥ 6,691
Additions: Initial credit impairments	107	35
Additions: Subsequent credit impairments	1	22
Reductions: Securities sold or matured	(403)	(939)
Balance at end of period	¥ 3,830	¥ 5,809

Loans and Allowance for Credi52

Loans and Allowance for Credit Losses (Narrative) (Detail)	6 Months Ended
	Sep. 30, 2017
Commercial [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans contractually past due before being placed on nonaccrual status, in month	1 month
Loans contractually past due before becoming defaulted loans, period	1 month
Commercial [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Temporary extensions of maturity dates to nonaccrual loans, in day	90 days
Residential [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans contractually past due before being placed on nonaccrual status, in month	6 months
Loans contractually past due before becoming defaulted loans, period	6 months
Residential [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Temporary extensions of maturity dates to nonaccrual loans, in day	90 days
Card [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans contractually past due before being placed on nonaccrual status, in month	3 months
Loans contractually past due before becoming defaulted loans, period	1 month
MUAH [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans contractually past due before being placed on nonaccrual status, in month	3 months
Loans contractually past due before becoming defaulted loans, period	60 days
Krungsri [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans contractually past due before being placed on nonaccrual status, in month	3 months
Loans contractually past due before becoming defaulted loans, period	6 months

Loans and Allowance for Credi53

Loans and Allowance for Credit Losses (Loans by Domicile and Industry of Borrower Segment Classification) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Unearned income, unamortized premiums-net and deferred loan fees-net		¥ (280,005)	¥ (288,507)
Total Loans, net	[1]	118,235,423	118,214,972
Loans held for sale		148,761	185,940
Domestic [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		65,901,804	67,006,528
Domestic [Member] | Manufacturing [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		11,478,200	11,796,803
Domestic [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		747,597	819,262
Domestic [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		11,628,219	11,622,372
Domestic [Member] | Services [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		2,483,356	2,549,300
Domestic [Member] | Wholesale and Retail [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		8,111,508	7,970,579
Domestic [Member] | Banks and Other Financial Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	[2]	4,928,322	5,223,906
Domestic [Member] | Communication and Information Services [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		1,578,257	1,634,584
Domestic [Member] | Other Industries [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		8,653,551	8,898,712
Domestic [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		16,292,794	16,491,010
Foreign [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		52,613,624	51,496,951
Foreign [Member] | Governments and Official Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		1,132,064	1,037,795
Foreign [Member] | Banks and Other Financial Institutions [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	[2]	14,333,357	13,844,964
Foreign [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		30,544,651	30,279,641
Foreign [Member] | Other [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans		¥ 6,603,552	¥ 6,334,551
[1]	The above table includes loans held for sale of ¥185,940 million at March 31, 2017 and ¥148,761 million at September 30, 2017, respectively.
[2]	Loans to so-called "non-bank finance companies" are generally included in the "Banks and other financial institutions" category. Non-bank finance companies are primarily engaged in consumer lending, factoring and credit card businesses.

Loans and Allowance for Credi54

Loans and Allowance for Credit Losses (Nonaccrual Status of Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	¥ 881,596	¥ 976,912
Loans held for sale placed on nonaccrual status		8,549
Loans acquired with deteriorated credit quality placed on nonaccrual status		8,281	9,720
Commercial [Member] | Domestic [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		464,509	471,148
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		170,053	185,095
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		11,928	15,202
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		36,058	44,374
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		34,240	38,602
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		121,408	131,213
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		1,404	2,432
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		22,673	18,685
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		43,559	10,034
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		23,186	25,511
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		121,698	191,889
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		72,577	75,399
Card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		61,350	61,424
MUAH [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		54,056	82,150
Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans		¥ 107,406	¥ 94,902
[1]	The above table does not include loans held for sale of nil and ¥8,549 million at March 31, 2017 and September 30, 2017, respectively, and loans acquired with deteriorated credit quality of ¥9,720 million and ¥8,281 million, at March 31, 2017 and September 30, 2017, respectively.

Loans and Allowance for Credi55

Loans and Allowance for Credit Losses (Impaired Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017		Mar. 31, 2017	Sep. 30, 2016	[4]	Mar. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses	[1]	¥ 1,240,400		¥ 1,461,030
Recorded loan balance, Not requiring an allowance for credit losses	[1],[2]	275,910		254,820
Recorded loan balance, Total	[1],[3]	1,516,310		1,715,850
Unpaid principal balance	[1]	1,641,670		1,847,578
Related allowance for credit losses	[1]	642,277		882,208
Accrual TDRs included in impaired loans		711,238	[4]	819,819	¥ 825,884		¥ 613,844
Impaired loans held for sales		21,585		9,879
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Accrual TDRs included in impaired loans		574,719		688,746
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		9,703		8,013
Recorded loan balance, Total	[3]	9,703		8,013
Unpaid principal balance		17,683		11,513
Related allowance for credit losses		3,939		3,619
Commercial [Member] | Domestic [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		798,605		875,977
Recorded loan balance, Not requiring an allowance for credit losses	[2]	174,397		187,738
Recorded loan balance, Total	[3]	973,002		1,063,715
Unpaid principal balance		1,011,187		1,107,203
Related allowance for credit losses		481,924		608,122
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		465,650		555,009
Recorded loan balance, Not requiring an allowance for credit losses	[2]	38,861		39,587
Recorded loan balance, Total	[3]	504,511		594,596
Unpaid principal balance		510,778		602,038
Related allowance for credit losses		264,592		411,787
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		12,106		15,007
Recorded loan balance, Not requiring an allowance for credit losses	[2]	7,600		9,068
Recorded loan balance, Total	[3]	19,706		24,075
Unpaid principal balance		20,515		24,907
Related allowance for credit losses		8,221		9,107
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		48,164		53,048
Recorded loan balance, Not requiring an allowance for credit losses	[2]	25,540		30,274
Recorded loan balance, Total	[3]	73,704		83,322
Unpaid principal balance		79,420		90,797
Related allowance for credit losses		12,289		14,987
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		41,362		48,304
Recorded loan balance, Not requiring an allowance for credit losses	[2]	20,071		23,162
Recorded loan balance, Total	[3]	61,433		71,466
Unpaid principal balance		65,892		78,097
Related allowance for credit losses		28,420		31,074
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		149,155		160,422
Recorded loan balance, Not requiring an allowance for credit losses	[2]	50,112		53,760
Recorded loan balance, Total	[3]	199,267		214,182
Unpaid principal balance		209,028		224,141
Related allowance for credit losses		107,728		115,673
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		1,634		1,836
Recorded loan balance, Not requiring an allowance for credit losses	[2]	27		607
Recorded loan balance, Total	[3]	1,661		2,443
Unpaid principal balance		1,661		2,443
Related allowance for credit losses		1,354		1,674
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		19,999		14,166
Recorded loan balance, Not requiring an allowance for credit losses	[2]	8,254		10,652
Recorded loan balance, Total	[3]	28,253		24,818
Unpaid principal balance		29,661		26,641
Related allowance for credit losses		16,303		10,565
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		47,146		10,714
Recorded loan balance, Not requiring an allowance for credit losses	[2]	7,934		5,806
Recorded loan balance, Total	[3]	55,080		16,520
Unpaid principal balance		56,503		17,403
Related allowance for credit losses		38,546		7,226
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		13,389		17,471
Recorded loan balance, Not requiring an allowance for credit losses	[2]	15,998		14,822
Recorded loan balance, Total	[3]	29,387		32,293
Unpaid principal balance		37,729		40,736
Related allowance for credit losses		4,471		6,029
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		141,967		262,887
Recorded loan balance, Not requiring an allowance for credit losses	[2]	43,722		23,019
Recorded loan balance, Total	[3]	185,689		285,906
Unpaid principal balance		211,938		309,975
Related allowance for credit losses		70,803		164,682
Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		113,729		120,465
Recorded loan balance, Not requiring an allowance for credit losses	[2]	6,130		6,557
Recorded loan balance, Total	[3]	119,859		127,022
Unpaid principal balance		145,237		154,006
Related allowance for credit losses		26,785		46,971
Accrual TDRs included in impaired loans		45,957		50,213
Card [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		69,440		71,849
Recorded loan balance, Not requiring an allowance for credit losses	[2]	408		462
Recorded loan balance, Total	[3]	69,848		72,311
Unpaid principal balance		77,497		80,392
Related allowance for credit losses		20,457		20,523
Accrual TDRs included in impaired loans		30,467		32,564
MUAH [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		50,796		77,160
Recorded loan balance, Not requiring an allowance for credit losses	[2]	29,304		16,292
Recorded loan balance, Total	[3]	80,100		93,452
Unpaid principal balance		92,992		113,414
Related allowance for credit losses		9,957		19,173
Accrual TDRs included in impaired loans		35,667		24,708
Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Recorded loan balance, Requiring an allowance for credit losses		56,160		44,679
Recorded loan balance, Not requiring an allowance for credit losses	[2]	21,949		20,752
Recorded loan balance, Total	[3]	78,109		65,431
Unpaid principal balance		85,136		71,075
Related allowance for credit losses		28,412		19,118
Accrual TDRs included in impaired loans		¥ 24,428		¥ 23,588
[1]	In addition to impaired loans presented in the above table, there were impaired loans held for sale of ¥9,879 million and ¥21,585 million at March 31, 2017 and September 30, 2017, respectively.
[2]	These loans do not require an allowance for credit losses because the recorded loan balance equals, or does not exceed, the present value of expected future cash flows discounted at the loans' effective interest rate, loans' observable market price, or the fair value of the collateral if the loan is a collateral-dependent loan.
[3]	Included in impaired loans at March 31, 2017 and September 30, 2017 are accrual TDRs as follows: ¥688,746 million and ¥574,719 million-Commercial; ¥50,213 million and ¥45,957 million-Residential; ¥32,564 million and ¥30,467 million-Card; ¥24,708 million and ¥35,667 million-MUAH; and ¥23,588 million and ¥24,428 million-Krungsri, respectively.
[4]	For the six months ended September 30, 2016, lease receivables of ¥51 million and ¥62 million in the Krungsri segment, which were accrual TDRs and nonaccrual TDRs, respectively, are excluded from the additions of accrual TDRs and other impaired loans, respectively, and the related ending balances of such TDRs amounting to ¥3,141 million and ¥772 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2016. For the six months ended September 30, 2017, lease receivables of ¥880 million and ¥70 million in the Krungsri segment, which were accrual TDRs and nonaccrual TDRs, respectively, are excluded from the additions of accrual TDRs and other impaired loans, respectively, and the related ending balances of such TDRs amounting to ¥4,644 million and ¥628 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2017.

Loans and Allowance for Credi56

Loans and Allowance for Credit Losses (Average Recorded Loan Balance and Recognized Interest Income on Impaired Loans by Class) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	¥ 1,527,040	¥ 1,609,584
Recognized interest income	13,550	12,907
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	8,817	11,051
Recognized interest income	563	371
Commercial [Member] | Domestic [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	952,510	999,938
Recognized interest income	4,830	6,238
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	509,211	484,687
Recognized interest income	1,812	2,505
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	20,112	24,336
Recognized interest income	144	200
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	77,940	100,849
Recognized interest income	574	726
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	62,750	80,076
Recognized interest income	381	569
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	190,328	217,657
Recognized interest income	1,109	1,469
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	2,030	641
Recognized interest income	7	4
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	24,872	25,560
Recognized interest income	192	264
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	34,783	26,766
Recognized interest income	387	207
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	30,484	39,366
Recognized interest income	224	294
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	235,723	294,123
Recognized interest income	3,573	1,977
Residential [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	123,441	137,247
Recognized interest income	846	971
Card [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	71,080	76,953
Recognized interest income	1,052	1,334
MUAH [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	64,293	43,181
Recognized interest income	898	467
Krungsri [Member]
Financing Receivable, Impaired [Line Items]
Average recorded loan balance	71,176	47,091
Recognized interest income	¥ 1,788	¥ 1,549

Loans and Allowance for Credi57

Loans and Allowance for Credit Losses (Roll-forward of Accrual TDRs and Other Impaired Loans) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Accrual TDRs:
Balance at beginning of period		¥ 819,819	¥ 613,844
Additions (new accrual TDR status)	[1]	65,483	358,224
Transfers to other impaired loans (including nonaccrual TDRs)		(16,624)	(28,876)
Loans sold		(16,776)	(1,594)
Principal payments and other		(140,664)	(115,714)
Balance at end of period	[1]	711,238	825,884
Other impaired loans (including nonaccrual TDRs):
Balance at beginning of period		896,031	1,111,306
Additions (new other impaired loans (including nonaccrual TDRs) status)	[1],[2]	145,885	196,443
Charge-off		(57,238)	(59,880)
Transfers to accrual TDRs		(20,000)	(312,649)
Loans sold		(22,482)	(12,951)
Principal payments and other		(137,124)	(167,508)
Balance at end of period	[1]	805,072	754,761
Card [Member]
Accrual TDRs:
Balance at beginning of period		32,564
Balance at end of period		30,467
Other impaired loans (including nonaccrual TDRs):
Additions of nonaccrual TDRs		6,489	5,527
MUAH [Member]
Accrual TDRs:
Balance at beginning of period		24,708
Balance at end of period		35,667
Other impaired loans (including nonaccrual TDRs):
Additions of nonaccrual TDRs		3,366	13,967
Krungsri [Member]
Accrual TDRs:
Balance at beginning of period		23,588
Balance at end of period		24,428
Lease receivables reported as accrual TDRs but excluded from "Additions" as impaired loans		880	51
Lease receivables excluded from accrual TDRs as impaired loans		4,644	3,141
Other impaired loans (including nonaccrual TDRs):
Lease receivables reported as nonaccrual TDRs but excluded from "Additions" as impaired loans		70	62
Lease receivables excluded from other impaired loans		628	772
Additions of nonaccrual TDRs		¥ 6,108	¥ 3,484
[1]	For the six months ended September 30, 2016, lease receivables of ¥51 million and ¥62 million in the Krungsri segment, which were accrual TDRs and nonaccrual TDRs, respectively, are excluded from the additions of accrual TDRs and other impaired loans, respectively, and the related ending balances of such TDRs amounting to ¥3,141 million and ¥772 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2016. For the six months ended September 30, 2017, lease receivables of ¥880 million and ¥70 million in the Krungsri segment, which were accrual TDRs and nonaccrual TDRs, respectively, are excluded from the additions of accrual TDRs and other impaired loans, respectively, and the related ending balances of such TDRs amounting to ¥4,644 million and ¥628 million, are also excluded from the balance of accrual TDRs and other impaired loans, respectively, as of September 30, 2017.
[2]	Included in the additions of other impaired loans for the six months ended September 30, 2016 and 2017 are nonaccrual TDRs as follows: ¥5,527 million and ¥6,489 million-Card; ¥13,967 million and ¥3,366 million-MUAH; and ¥3,484 million and ¥6,108 million-Krungsri, respectively.

Loans and Allowance for Credi58

Loans and Allowance for Credit Losses (Troubled Debt Restructurings by Class) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment		¥ 82,391	¥ 381,616
Troubled debt restructurings, Post-modification outstanding recorded investment		82,113	381,315
Troubled debt restructurings that subsequently defaulted, Recorded Investment		9,163	7,734
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]		1,030
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]		1,030
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]
Commercial [Member] | Domestic [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	28,645	279,767
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	28,603	279,767
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	2,996	2,790
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	12,502	251,468
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	12,460	251,468
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	368	1,089
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	142	1,287
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	142	1,287
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	1,107	4,796
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	1,107	4,796
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	10
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	2,343	3,024
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	2,343	3,024
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	680	158
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	9,889	15,046
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	9,889	15,046
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	1,778	1,510
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	246
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	246
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	1,072	2,001
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	1,072	2,001
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	135
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	425	948
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	425	948
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	919	1,197
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	919	1,197
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	25	33
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	9,983	49,767
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	9,983	49,767
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]
Residential [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[2]	5,459	7,160
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[2]	5,459	7,160
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[2]	124	78
Card [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	9,570	8,244
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	9,334	8,056
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	1,977	2,027
MUAH [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	18,878	21,721
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	18,878	21,608
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	2,331	1,641
Krungsri [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Pre-modification outstanding recorded investment	[1],[3]	9,856	13,927
Troubled debt restructurings, Post-modification outstanding recorded investment	[1],[3]	9,856	13,927
Troubled debt restructurings that subsequently defaulted, Recorded Investment	[1],[3]	¥ 1,735	¥ 1,198
[1]	For the six months ended September 30, 2016, extension of the stated maturity date of loans was the primary concession type in the Residential and Krungsri segments, reduction in the stated rate was the primary concession type in the Card and Commercial segments and payment deferrals was the primary concession type in the MUAH segment. For the six months ended September 30, 2017, extension of the stated maturity date of loans was the primary concession type in the Commercial, Residential, MUAH and Krungsri segments, reduction in the stated rate was the primary concession type in the Card segments.
[2]	TDRs for the Commercial and Residential segments include accruing loans, and do not include nonaccrual loans.
[3]	TDRs for the Card, MUAH and Krungsri segments include accrual and nonaccrual loans.

Loans and Allowance for Credi59

Loans and Allowance for Credit Losses (Outstanding Recorded Investment Balances of Troubled Debt Restructurings by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances		¥ 809,425	¥ 927,751
Commercial [Member] | Domestic [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	508,498	592,578
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	334,467	409,500
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	7,778	8,881
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	37,645	38,953
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	27,192	32,864
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	77,857	82,968
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	256	11
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	5,580	6,133
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	11,523	6,486
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	6,200	6,782
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	66,221	96,168
Residential [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[1]	45,957	50,213
Card [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[2]	69,848	72,311
MUAH [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[2]	66,593	69,830
Krungsri [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances	[2]	52,308	46,651
Nonaccrual [Member] | Card [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances		39,381	39,747
Nonaccrual [Member] | MUAH [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances		30,926	45,122
Nonaccrual [Member] | Krungsri [Member]
Financing Receivable, Modifications [Line Items]
TDRs, Outstanding recorded investment balances		¥ 23,236	¥ 18,998
[1]	TDRs for the Commercial and Residential segments include accruing loans and do not include nonaccrual loans.
[2]	TDRs for the Card, MUAH and Krungsri segments include accrual and nonaccrual loans. Included in the outstanding recorded investment balances as of March 31, 2017 and September 30, 2017 are nonaccrual TDRs as follows: ¥39,747 million and ¥39,381 million-Card; ¥45,122 million and ¥30,926 million-MUAH; and ¥18,998 million and ¥23,236 million-Krungsri, respectively.

Loans and Allowance for Credi60

Loans and Allowance for Credit Losses (Credit Quality Indicators of Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	¥ 89,704,365	¥ 89,360,707
Commercial [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		86,682,866	85,723,317
Commercial [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		2,584,012	3,145,765
Commercial [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		437,487	491,625
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	31,527	34,140
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		14,230	16,503
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		12,576	12,572
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		4,721	5,065
Commercial [Member] | Domestic [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	51,144,948	52,031,339
Commercial [Member] | Domestic [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		48,998,517	49,572,413
Commercial [Member] | Domestic [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		1,832,425	2,161,965
Commercial [Member] | Domestic [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		314,006	296,961
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	11,461,420	11,768,707
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		10,741,717	10,882,533
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		655,748	821,062
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		63,955	65,112
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	747,031	818,684
Commercial [Member] | Domestic [Member] | Construction [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		687,938	753,879
Commercial [Member] | Domestic [Member] | Construction [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		48,890	53,255
Commercial [Member] | Domestic [Member] | Construction [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		10,203	11,550
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	11,544,199	11,532,804
Commercial [Member] | Domestic [Member] | Real Estate [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		11,198,972	11,137,637
Commercial [Member] | Domestic [Member] | Real Estate [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		309,827	352,785
Commercial [Member] | Domestic [Member] | Real Estate [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		35,400	42,382
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	2,471,670	2,535,541
Commercial [Member] | Domestic [Member] | Services [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		2,246,457	2,267,272
Commercial [Member] | Domestic [Member] | Services [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		198,002	237,067
Commercial [Member] | Domestic [Member] | Services [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		27,211	31,202
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	8,094,969	7,964,680
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		7,596,267	7,403,680
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		408,725	462,577
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		89,977	98,423
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	4,928,223	5,223,007
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		4,915,187	5,207,774
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		11,632	14,341
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		1,404	892
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	1,577,921	1,634,217
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		1,513,008	1,573,518
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		44,328	45,342
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		20,585	15,357
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	8,651,175	8,859,725
Commercial [Member] | Domestic [Member] | Other Industries [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		8,497,806	8,725,914
Commercial [Member] | Domestic [Member] | Other Industries [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		110,830	125,725
Commercial [Member] | Domestic [Member] | Other Industries [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		42,539	8,086
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	1,668,340	1,693,974
Commercial [Member] | Domestic [Member] | Consumer [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		1,601,165	1,620,206
Commercial [Member] | Domestic [Member] | Consumer [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		44,443	49,811
Commercial [Member] | Domestic [Member] | Consumer [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		22,732	23,957
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	38,527,890	37,295,228
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		37,670,119	36,134,401
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member] | Close Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		739,011	971,228
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member] | Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		118,760	189,599
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	14,151,345	14,332,448
Residential [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		14,081,156	14,256,263
Residential [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		70,189	76,185
Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	592,638	593,153
Card [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		530,913	531,331
Card [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		61,725	61,822
MUAH [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1],[2]	8,801,224	9,024,455
FDIC covered loans acquired with deteriorated credit quality and small business loans which are not individually rated		1,144	40,534
MUAH [Member] | Credit Quality Based on the Number of Delinquencies [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		3,963,344	3,837,763
MUAH [Member] | Credit Quality Based on the Number of Delinquencies [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		17,136	22,949
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		4,612,200	4,879,158
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		74,704	133,032
MUAH [Member] | Credit Quality Based on Internal Credit Ratings [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		133,840	151,553
Krungsri [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade	[1]	5,115,951	4,966,242
Krungsri [Member] | Normal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		4,820,843	4,672,435
Krungsri [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		185,274	195,472
Krungsri [Member] | Substandard or Doubtful or Doubtful of Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans classified by borrowing grade		¥ 109,834	¥ 98,335
[1]	Total loans in the above table do not include loans held for sale, and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees.
[2]	Total loans of MUAH do not include Federal Deposit Insurance Corporation ("FDIC") covered loans and small business loans which are not individually rated totaling ¥40,534 million and ¥1,144 million at March 31, 2017 and September 30, 2017, respectively. The MUFG Group will be reimbursed for a substantial portion of any future losses on FDIC covered loans under the terms of the FDIC loss share agreements.

Loans and Allowance for Credi61

Loans and Allowance for Credit Losses (Ages of Past Due Loans by Class) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		¥ 444,727	¥ 472,291
Loans, current		117,843,646	117,753,634
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	118,288,373	118,225,925
Loans, greater than 90 days past due and accruing		33,092	40,608
1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		245,370	241,612
Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		199,357	230,679
Commercial [Member] | Domestic [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		30,695	31,878
Loans, current		51,114,253	51,999,461
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	51,144,948	52,031,339
Loans, greater than 90 days past due and accruing		5,487	5,817
Commercial [Member] | Domestic [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		10,742	12,410
Commercial [Member] | Domestic [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		19,953	19,468
Commercial [Member] | Domestic [Member] | Manufacturing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		3,094	3,098
Loans, current		11,458,326	11,765,609
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	11,461,420	11,768,707
Loans, greater than 90 days past due and accruing			20
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,370	1,427
Commercial [Member] | Domestic [Member] | Manufacturing [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,724	1,671
Commercial [Member] | Domestic [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		911	516
Loans, current		746,120	818,168
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	747,031	818,684
Commercial [Member] | Domestic [Member] | Construction [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		639	281
Commercial [Member] | Domestic [Member] | Construction [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		272	235
Commercial [Member] | Domestic [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		5,348	7,713
Loans, current		11,538,851	11,525,091
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	11,544,199	11,532,804
Loans, greater than 90 days past due and accruing		1,665	1,542
Commercial [Member] | Domestic [Member] | Real Estate [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,385	2,655
Commercial [Member] | Domestic [Member] | Real Estate [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		3,963	5,058
Commercial [Member] | Domestic [Member] | Services [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		2,358	4,519
Loans, current		2,469,312	2,531,022
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	2,471,670	2,535,541
Loans, greater than 90 days past due and accruing		68	4
Commercial [Member] | Domestic [Member] | Services [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,410	1,294
Commercial [Member] | Domestic [Member] | Services [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		948	3,225
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		6,424	3,815
Loans, current		8,088,545	7,960,865
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	8,094,969	7,964,680
Loans, greater than 90 days past due and accruing		78	149
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,737	1,932
Commercial [Member] | Domestic [Member] | Wholesale and Retail [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		4,687	1,883
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		52	24
Loans, current		4,928,171	5,222,983
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	4,928,223	5,223,007
Loans, greater than 90 days past due and accruing		31
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due			3
Commercial [Member] | Domestic [Member] | Banks and Other Financial Institutions [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		52	21
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,166	799
Loans, current		1,576,755	1,633,418
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	1,577,921	1,634,217
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		740	583
Commercial [Member] | Domestic [Member] | Communication and Information Services [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		426	216
Commercial [Member] | Domestic [Member] | Other Industries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,790	436
Loans, current		8,649,385	8,859,289
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	8,651,175	8,859,725
Commercial [Member] | Domestic [Member] | Other Industries [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		116	337
Commercial [Member] | Domestic [Member] | Other Industries [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		1,674	99
Commercial [Member] | Domestic [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		9,552	10,958
Loans, current		1,658,788	1,683,016
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	1,668,340	1,693,974
Loans, greater than 90 days past due and accruing		3,645	4,102
Commercial [Member] | Domestic [Member] | Consumer [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		3,345	3,898
Commercial [Member] | Domestic [Member] | Consumer [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		6,207	7,060
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		37,673	55,373
Loans, current		38,490,217	37,239,855
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	38,527,890	37,295,228
Loans, greater than 90 days past due and accruing			2,244
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		16,279	5,268
Commercial [Member] | Foreign-excluding MUAH and Krungsri [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		21,394	50,105
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		111,376	120,562
Loans, current		14,030,372	14,202,076
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	14,141,748	14,322,638
Loans, greater than 90 days past due and accruing		25,813	31,382
Residential [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		76,176	78,227
Residential [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		35,200	42,335
Card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		48,739	48,788
Loans, current		533,271	533,484
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	582,010	582,272
Card [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		17,357	17,490
Card [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		31,382	31,298
MUAH [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		38,192	39,374
Loans, current		8,745,243	8,998,049
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	8,783,435	9,037,423
Loans, greater than 90 days past due and accruing		1,792	1,165
FDIC covered loans not subject to the guidance on loans and debt securities acquired with deteriorated credit quality			438
MUAH [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		24,640	25,162
MUAH [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		13,552	14,212
Krungsri [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		178,052	176,316
Loans, current		4,930,290	4,780,709
Loans, excluding loans held for sale and loans acquired with deteriorated credit quality	[1],[2]	5,108,342	4,957,025
Krungsri [Member] | 1 to 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		100,176	103,055
Krungsri [Member] | Greater than 3 Months Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due		¥ 77,876	¥ 73,261
[1]	Total loans in the above table do not include loans held for sale and loans acquired with deteriorated credit quality and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees.
[2]	Total loans of MUAH do not include ¥438 million and nil of FDIC covered loans at March 31, 2017 and September 30, 2017, respectively, which are not subject to the guidance on loans and debt securities acquired with deteriorated credit quality.

Loans and Allowance for Credi62

Loans and Allowance for Credit Losses (Changes in Allowance for Credit Losses by Portfolio Segment) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, at beginning of period		¥ 1,182,188	¥ 1,111,130
Provision (credit) for credit losses		(186,568)	(58,681)
Charge-offs		104,004	101,581
Recoveries		23,656	19,273
Net charge-offs		80,348	82,308
Others	[1]	909	(44,663)
Allowance for credit losses, at end of period		916,181	925,478
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, at beginning of period		900,686	816,559
Provision (credit) for credit losses		(207,025)	(94,482)
Charge-offs		55,204	55,096
Recoveries		12,376	9,758
Net charge-offs		42,828	45,338
Others	[1]	1,709	(17,485)
Allowance for credit losses, at end of period		652,542	659,254
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, at beginning of period		67,336	58,598
Provision (credit) for credit losses		(16,024)	480
Charge-offs		2,238	3,351
Recoveries		666	941
Net charge-offs		1,572	2,410
Others	[1]		1
Allowance for credit losses, at end of period		49,740	56,669
Card [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, at beginning of period		30,165	31,187
Provision (credit) for credit losses		10,669	6,492
Charge-offs		11,047	8,050
Recoveries		695	1,208
Net charge-offs		10,352	6,842
Allowance for credit losses, at end of period		30,482	30,837
MUAH [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, at beginning of period		73,733	108,454
Provision (credit) for credit losses		(5,882)	1,526
Charge-offs		9,241	12,077
Recoveries		1,547	736
Net charge-offs		7,694	11,341
Others	[1]	(2,679)	(14,737)
Allowance for credit losses, at end of period		57,478	83,902
Krungsri [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, at beginning of period		110,268	96,332
Provision (credit) for credit losses		31,694	27,303
Charge-offs		26,274	23,007
Recoveries		8,372	6,630
Net charge-offs		17,902	16,377
Others	[1]	1,879	(12,442)
Allowance for credit losses, at end of period		¥ 125,939	¥ 94,816
[1]	Others are principally comprised of gains or losses from foreign exchange translation.

Loans and Allowance for Credi63

Loans and Allowance for Credit Losses (Allowance for Credit Losses and Recorded Investment in Loans by Portfolio Segment) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016
Allowance for credit losses:
Individually evaluated for impairment		¥ 637,898	¥ 878,056
Collectively evaluated for impairment		262,672	289,609
Loans acquired with deteriorated credit quality		15,611	14,523
Total		916,181	1,182,188	¥ 925,478	¥ 1,111,130
Loans:
Individually evaluated for impairment		1,504,571	1,705,591
Collectively evaluated for impairment		116,783,802	116,520,772
Loans acquired with deteriorated credit quality		78,294	91,176
Total	[1]	118,366,667	118,317,539
Commercial [Member]
Allowance for credit losses:
Individually evaluated for impairment		552,727	772,804
Collectively evaluated for impairment		86,373	115,489
Loans acquired with deteriorated credit quality		13,442	12,393
Total		652,542	900,686	659,254	816,559
Loans:
Individually evaluated for impairment		1,158,691	1,349,621
Collectively evaluated for impairment		88,514,147	87,976,946
Loans acquired with deteriorated credit quality		31,527	34,140
Total	[1]	89,704,365	89,360,707
Residential [Member]
Allowance for credit losses:
Individually evaluated for impairment		26,412	46,520
Collectively evaluated for impairment		21,702	19,255
Loans acquired with deteriorated credit quality		1,626	1,561
Total		49,740	67,336	56,669	58,598
Loans:
Individually evaluated for impairment		118,536	125,611
Collectively evaluated for impairment		14,023,212	14,197,027
Loans acquired with deteriorated credit quality		9,597	9,810
Total	[1]	14,151,345	14,332,448
Card [Member]
Allowance for credit losses:
Individually evaluated for impairment		20,457	20,523
Collectively evaluated for impairment		10,010	9,632
Loans acquired with deteriorated credit quality		15	10
Total		30,482	30,165	30,837	31,187
Loans:
Individually evaluated for impairment		69,415	71,879
Collectively evaluated for impairment		512,595	510,393
Loans acquired with deteriorated credit quality		10,628	10,881
Total	[1]	592,638	593,153
MUAH [Member]
Allowance for credit losses:
Individually evaluated for impairment		9,957	19,174
Collectively evaluated for impairment		47,063	54,096
Loans acquired with deteriorated credit quality		458	463
Total		57,478	73,733	83,902	108,454
Loans:
Individually evaluated for impairment		80,100	93,452
Collectively evaluated for impairment		8,703,335	8,944,409
Loans acquired with deteriorated credit quality		18,933	27,128
Total	[1]	8,802,368	9,064,989
Krungsri [Member]
Allowance for credit losses:
Individually evaluated for impairment		28,345	19,035
Collectively evaluated for impairment		97,524	91,137
Loans acquired with deteriorated credit quality		70	96
Total		125,939	110,268	¥ 94,816	¥ 96,332
Loans:
Individually evaluated for impairment		77,829	65,028
Collectively evaluated for impairment		5,030,513	4,891,997
Loans acquired with deteriorated credit quality		7,609	9,217
Total	[1]	¥ 5,115,951	¥ 4,966,242
[1]	Total loans in the above table do not include loans held for sale, and represent balances without adjustments in relation to unearned income, unamortized premiums and deferred loan fees.

Goodwill and Other Intangible64

Goodwill and Other Intangible Assets (Narrative) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Goodwill and Other Intangible Assets [Line Items]
Impairment losses on other intangible assets	¥ 16,591	¥ 968
Business Segment [Member] | Customer Business [Member] | Trust Assets Business Group [Member] | Foreign [Member]
Goodwill and Other Intangible Assets [Line Items]
Impairment loss	¥ 11,121

Goodwill and Other Intangible65

Goodwill and Other Intangible Assets (Movement in Carrying Amount of Goodwill) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, at beginning of period		¥ 2,542,280	¥ 2,539,874
Accumulated impairment losses, at beginning of period		(2,092,137)	(2,085,499)
Goodwill, Net at beginning of period		450,143	454,375
Goodwill recognized during the six months	[1]		2,858
Foreign currency translation adjustments and other		(14,590)	(65,132)
Goodwill, at end of period		2,527,690	2,477,600
Accumulated impairment losses, at end of period		(2,092,137)	(2,085,499)
Goodwill, Net at end of period		¥ 435,553	¥ 392,101
[1]	See Note 2 for the goodwill recognized in connection with acquisitions.

Goodwill and Other Intangible66

Goodwill and Other Intangible Assets (Carrying Amount of Other Intangible Assets by Major Class) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2017	Mar. 31, 2017
Intangible assets subject to amortization:
Net carrying amount	¥ 990,633	¥ 1,011,235
Intangible assets not subject to amortization:
Total intangible assets, Net carrying amount	999,755	1,020,359
Other [Member]
Intangible assets not subject to amortization:
Net carrying amount	9,122	9,124
Software [Member]
Intangible assets subject to amortization:
Net carrying amount	713,438	711,190
Core Deposit Intangibles [Member]
Intangible assets subject to amortization:
Net carrying amount	46,948	50,100
Customer Relationships [Member]
Intangible assets subject to amortization:
Net carrying amount	171,363	191,992
Trade Names [Member]
Intangible assets subject to amortization:
Net carrying amount	47,932	49,814
Other [Member]
Intangible assets subject to amortization:
Net carrying amount	¥ 10,952	¥ 8,139

Pledged Assets and Collateral (

Pledged Assets and Collateral (Narrative) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2017	Mar. 31, 2017
Financial Instruments Pledged as Collateral [Abstract]
Investment securities pledged as collateral for acting as a collection agent of public funds	¥ 15,913,526
Cash collateral pledged for derivative transactions included in Other assets	2,001,628	¥ 1,663,945
Cash collateral received for derivative transactions included in Other liabilities	¥ 861,877	¥ 1,080,929

Pledged Assets and Collateral68

Pledged Assets and Collateral (Assets Mortgaged, Pledged, or Otherwise Subject to Lien) (Detail) ¥ in Millions	Sep. 30, 2017JPY (¥)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 31,888,014
Trading Account Assets, Trading Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	7,975,769
Investment Securities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	8,328,320
Loans [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	15,522,796
Other [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 61,129

Pledged Assets and Collateral69

Pledged Assets and Collateral (Pledged Assets Classified by Type of Liabilities) (Detail) ¥ in Millions	Sep. 30, 2017JPY (¥)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 31,888,014
Deposits [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	316,560
Payables under Repurchase Agreements and Securities Lending Transactions [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	12,965,112
Other Short-term Borrowings and Long-term Debt [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	18,569,633
Other [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged assets	¥ 36,709

Severance Indemnities and Pen70

Severance Indemnities and Pension Plans (Components of Net Periodic Cost of Pension Benefits and Other Benefits) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Domestic Subsidiaries [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	¥ 23,539	¥ 24,453
Interest cost on projected benefit obligation	7,266	6,232
Expected return on plan assets	(34,144)	(30,126)
Amortization of net actuarial loss	3,946	8,870
Amortization of prior service cost	(580)	(3,784)
Gain on settlements and curtailment	(2,019)	(445)
Net periodic benefit cost	(1,992)	5,200
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	5,646	6,701
Interest cost on projected benefit obligation	7,651	8,027
Expected return on plan assets	(16,069)	(15,075)
Amortization of net actuarial loss	5,740	9,788
Amortization of prior service cost	(1,547)	(1,063)
Net periodic benefit cost	1,421	8,378
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	348	548
Interest cost on projected benefit obligation	540	717
Expected return on plan assets	(1,062)	(1,066)
Amortization of net actuarial loss	563	669
Amortization of prior service cost	(1,391)	(427)
Net periodic benefit cost	¥ (1,002)	¥ 441

Severance Indemnities and Pen71

Severance Indemnities and Pension Plans (Contributed to Plan Assets and Expected to Contribute for Remainder of Fiscal Year) (Detail) ¥ in Billions	6 Months Ended
	Sep. 30, 2017JPY (¥)
Domestic Subsidiaries [Member] | Pension Benefits and SIPs [Member]
Defined Benefit Plan Disclosure [Line Items]
For the six months ended September 30, 2017	¥ 51.3
For the remainder of the fiscal year ending March 31, 2018	23
Foreign Offices and Subsidiaries [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
For the six months ended September 30, 2017	14.8
For the remainder of the fiscal year ending March 31, 2018	1.5
Foreign Offices and Subsidiaries [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
For the six months ended September 30, 2017	0.2
For the remainder of the fiscal year ending March 31, 2018	¥ 0.2

Offsetting of Derivatives, Re72

Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions (Summary of Offsetting of Derivatives, Repurchase Agreements, and Securities Lending Transactions) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
Offsetting [Abstract]
Derivative assets, Gross amounts of recognized assets/liabilities		¥ 16,256,000	¥ 18,835,000
Derivative assets, Gross amounts offset in the condensed consolidated balance sheet
Derivative assets, Net amounts presented in the condensed consolidated balance sheet	[1],[2],[3]	16,256,000	18,835,000
Derivative assets, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(12,843,000)	(15,053,000)
Derivative assets, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(670,000)	(726,000)
Derivative assets, Net amounts		2,743,000	3,056,000
Receivables under resale agreements, Gross amounts of recognized assets/liabilities		9,676,000	11,044,000
Receivables under resale agreements, Gross amounts offset in the condensed consolidated balance sheet		(2,975,000)	(2,856,000)
Receivables under resale agreements, Net amounts presented in the condensed consolidated balance sheet		6,701,000	8,188,000
Receivables under resale agreements, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(6,127,000)	(7,461,000)
Receivables under resale agreements, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(13,000)	(11,000)
Receivables under resale agreements, Net amounts		561,000	716,000
Receivables under securities borrowing transactions, Gross amounts of recognized assets/liabilities		9,839,000	11,003,000
Receivables under securities borrowing transactions, Gross amounts offset in the condensed consolidated balance sheet
Receivables under securities borrowing transactions, Net amounts presented in the condensed consolidated balance sheet		9,838,929	11,002,724
Receivables under securities borrowing transactions, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(9,723,000)	(10,880,000)
Receivables under securities borrowing transactions, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(16,000)	(9,000)
Receivables under securities borrowing transactions, Net amounts		100,000	114,000
Financial assets, Gross amounts of recognized assets/liabilities, Total		35,771,000	40,882,000
Financial assets, Gross amounts offset in the condensed consolidated balance sheet, Total		(2,975,000)	(2,856,000)
Financial assets, Net amounts presented in the condensed consolidated balance sheet, Total		32,796,000	38,026,000
Financial assets, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments, Total		(28,693,000)	(33,394,000)
Financial assets, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged, Total		(699,000)	(746,000)
Financial assets, Net amounts, Total		3,404,000	3,886,000
Derivative liabilities, Gross amounts of recognized assets/liabilities		16,273,000	18,562,000
Derivative liabilities, Gross amounts offset in the condensed consolidated balance sheet
Derivative liabilities, Net amounts presented in the condensed consolidated balance sheet	[1],[2],[3]	16,273,000	18,562,000
Derivative liabilities, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(12,691,000)	(15,063,000)
Derivative liabilities, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(1,539,000)	(1,229,000)
Derivative liabilities, Net amounts		2,043,000	2,270,000
Payables under repurchase agreements, Gross amounts of recognized assets/liabilities	[4]	22,057,000	20,549,000
Payables under repurchase agreements, Gross amounts offset in the condensed consolidated balance sheet	[4]	(2,892,000)	(2,856,000)
Payables under repurchase agreements, Net amounts presented in the condensed consolidated balance sheet	[4]	19,165,000	17,693,000
Payables under repurchase agreements, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments	[4]	(18,946,000)	(17,489,000)
Payables under repurchase agreements, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged	[4]	(29,000)	(11,000)
Payables under repurchase agreements, Net amounts	[4]	190,000	193,000
Payables under securities lending transactions, Gross amounts of recognized assets/liabilities		4,790,000	5,549,000
Payables under securities lending transactions, Gross amounts offset in the condensed consolidated balance sheet
Payables under securities lending transactions, Net amounts presented in the condensed consolidated balance sheet		4,789,971	5,549,004
Payables under securities lending transactions, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(4,757,000)	(5,526,000)
Payables under securities lending transactions, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged		(12,000)	(8,000)
Payables under securities lending transactions, Net amounts		21,000	15,000
Obligations to return securities received as collateral, Gross amounts of recognized assets/liabilities		2,700,000	3,516,000
Obligations to return securities received as collateral, Gross amounts offset in the condensed consolidated balance sheet
Obligations to return securities received as collateral, Net amounts presented in the condensed consolidated balance sheet		2,699,912	3,516,232
Obligations to return securities received as collateral, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments		(704,000)	(492,000)
Obligations to return securities received as collateral, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged
Obligations to return securities received as collateral, Net amounts		1,996,000	3,024,000
Financial liabilities, Gross amounts of recognized assets/liabilities, Total		45,820,000	48,176,000
Financial liabilities, Gross amounts offset in the condensed consolidated balance sheet, Total		(2,892,000)	(2,856,000)
Financial liabilities, Net amounts presented in the condensed consolidated balance sheet, Total		42,928,000	45,320,000
Financial liabilities, Gross amounts not offset in the condensed consolidated balance sheet, Financial instruments, Total		(37,098,000)	(38,570,000)
Financial liabilities, Gross amounts not offset in the condensed consolidated balance sheet, Cash collateral received/pledged, Total		(1,580,000)	(1,248,000)
Financial liabilities, Net amounts, Total		4,250,000	5,502,000
Payables under long-term repurchase agreements		¥ 2,046,159	¥ 1,611,916
[1]	For more information about fair value measurement and assumptions used to measure the fair value of derivatives, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.
[2]	The fair value of derivative instruments is presented on a gross basis even when derivative instruments are subject to master netting agreements. Cash collateral payable and receivable associated with derivative instruments are not added to or netted against the fair value amounts.
[3]	This table does not include contracts with embedded derivatives for which the fair value option has been elected.
[4]	Payables under repurchase agreements in the above table include those under long-term repurchase agreements of ¥1,611,916 million and ¥2,046,159 million at March 31, 2017 and September 30, 2017, respectively, which are included in Long-term debt in the accompanying condensed consolidated balance sheets.

Repurchase Agreements, and Se73

Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings (Gross Obligations by Remaining Contractual Maturity and Class of Collateral Pledged) (Detail) - JPY (¥) ¥ in Billions		Sep. 30, 2017	Mar. 31, 2017
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	[1]	¥ 22,057	¥ 20,549
Payables under securities lending transactions		4,790	5,549
Obligations to return securities received as collateral		2,700	3,516
Total		29,547	29,614
Overnight and Open [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		2,436	2,309
Payables under securities lending transactions		1,539	1,811
Obligations to return securities received as collateral		2,468	3,329
Total		6,443	7,449
30 Days or Less [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		13,967	13,455
Payables under securities lending transactions		1,774	1,970
Obligations to return securities received as collateral		43	102
Total		15,784	15,527
31-90 Days [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		3,320	3,083
Payables under securities lending transactions		1,477	1,768
Obligations to return securities received as collateral		189	85
Total		4,986	4,936
Over 90 Days [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		2,334	1,702
Total		¥ 2,334	¥ 1,702
[1]	Payables under repurchase agreements in the above table include those under long-term repurchase agreements of ¥1,611,916 million and ¥2,046,159 million at March 31, 2017 and September 30, 2017, respectively, which are included in Long-term debt in the accompanying condensed consolidated balance sheets.

Repurchase Agreements, and Se74

Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings (Secured Borrowing by the Class of Collateral Pledged) (Detail) - JPY (¥) ¥ in Billions		Sep. 30, 2017	Mar. 31, 2017
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements	[1]	¥ 22,057	¥ 20,549
Payables under securities lending transactions		4,790	5,549
Obligations to return securities received as collateral		2,700	3,516
Total		29,547	29,614
Japanese National Government and Japanese Government Agency Bonds [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		2,244	2,975
Payables under securities lending transactions		4,014	5,030
Obligations to return securities received as collateral		860	2,020
Total		7,118	10,025
Foreign Governments and Official Institutions Bonds [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		15,347	13,195
Obligations to return securities received as collateral		1,287	1,101
Total		16,634	14,296
Corporate Bonds [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		430	636
Payables under securities lending transactions		2	1
Obligations to return securities received as collateral		131	117
Total		563	754
Residential Mortgage-backed Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		3,840	3,401
Total		3,840	3,401
Other Debt Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		123	205
Obligations to return securities received as collateral		4	3
Total		127	208
Marketable Equity Securities [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		37	104
Payables under securities lending transactions		774	518
Obligations to return securities received as collateral		418	275
Total		1,229	897
Others [Member]
Repurchase Agreements, and Securities Lending Transactions Accounted for as Secured Borrowings [Line Items]
Payables under repurchase agreements		36	33
Total		¥ 36	¥ 33
[1]	Payables under repurchase agreements in the above table include those under long-term repurchase agreements of ¥1,611,916 million and ¥2,046,159 million at March 31, 2017 and September 30, 2017, respectively, which are included in Long-term debt in the accompanying condensed consolidated balance sheets.

Accumulated Other Comprehensi75

Accumulated Other Comprehensive Income (Loss) (Changes in Accumulated OCI, Net of Tax and Net of Noncontrolling Interests) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized gains (losses) on investment securities, Balance at beginning of period	¥ 2,032,807	¥ 1,995,314
Net unrealized gains (losses) on investment securities, Net change during the period	253,088	(132,427)
Net unrealized gains (losses) on investment securities, Effect of adopting new guidance on consolidation of certain variable interest entities		5,509
Net unrealized gains (losses) on investment securities, Balance at end of period	2,285,895	1,868,396
Net debt valuation adjustments, Balance at beginning of period	(10,632)	(2,080)
Net debt valuation adjustments, Net change during the period	(5,779)	866
Net debt valuation adjustments, Balance at end of period	(16,411)	(1,214)
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Balance at beginning of period	(8,729)	4,516
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Net change during the period	(626)	19,205
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Balance at end of period	(9,355)	23,721
Defined benefit plans, Balance at beginning of period	(214,062)	(317,422)
Defined benefit plans, Net change during the period	24,604	18,291
Defined benefit plans, Balance at end of period	(189,458)	(299,131)
Foreign currency translation adjustments, Balance at beginning of period	482,039	620,931
Foreign currency translation adjustments, Net change during the period	(37,968)	(730,374)
Foreign currency translation adjustments, Effect of adopting new guidance on consolidation of certain variable interest entities		(1,636)
Foreign currency translation adjustments, Balance at end of period	444,071	(111,079)
Accumulated other comprehensive income (loss), net of taxes: Balance at end of period	¥ 2,514,742	¥ 1,480,693	¥ 2,281,423

Accumulated Other Comprehensi76

Accumulated Other Comprehensive Income (Loss) (Before Tax and Net of Tax Changes in Each Component of Accumulated OCI) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Net unrealized gains (losses) on investment securities, Before tax:
Net unrealized gains (losses) on investment securities		¥ 540,758	¥ (71,019)
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		(175,398)	(120,742)
Net change		365,360	(191,761)
Net unrealized gains (losses) on investment securities, Tax (expense) or benefit:
Net unrealized gains (losses) on investment securities		(169,917)	19,199
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		52,011	38,139
Net change		(117,906)	57,338
Net unrealized gains (losses) on investment securities, Net of tax:
Net unrealized gains (losses) on investment securities		370,841	(51,820)
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		(123,387)	(82,603)
Net change	[1]	247,454	(134,423)
Net unrealized losses on investment securities attributable to noncontrolling interests		(5,634)	(1,996)
Net unrealized gains (losses) on investment securities attributable to Mitsubishi UFJ Financial Group		253,088	(132,427)
Net debt valuation adjustments, Before tax:
Net debt valuation adjustments		(8,218)	1,158
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests		(111)	105
Net change		(8,329)	1,263
Net debt valuation adjustments, Tax (expense) or benefit:
Net debt valuation adjustments		2,516	(364)
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests		34	(33)
Net change		2,550	(397)
Net debt valuation adjustments, Net of tax:
Net debt valuation adjustments		(5,702)	794
Reclassification adjustment for losses (gains) included in net income before attribution of noncontrolling interests		(77)	72
Net change		(5,779)	866
Net debt valuation adjustments attributable to noncontrolling interests
Net debt valuation adjustments attributable to Mitsubishi UFJ Financial Group		(5,779)	866
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Before tax:
Net unrealized gains on derivatives qualifying for cash flow hedges		4,450	41,833
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		(5,584)	(9,678)
Net change		(1,134)	32,155
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Tax (expense) or benefit:
Net unrealized gains on derivatives qualifying for cash flow hedges		(1,641)	(16,752)
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		2,149	3,802
Net change		508	(12,950)
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges, Net of tax:
Net unrealized gains on derivatives qualifying for cash flow hedges		2,809	25,081
Reclassification adjustment for gains included in net income before attribution of noncontrolling interests		(3,435)	(5,876)
Net change		(626)	19,205
Net unrealized gains on derivatives qualifying for cash flow hedges attributable to noncontrolling interests
Net unrealized gains (losses) on derivatives qualifying for cash flow hedges attributable to Mitsubishi UFJ Financial Group		(626)	19,205
Defined benefit plans, Before tax:
Defined benefit plans		31,778	15,910
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests		4,659	13,598
Net change		36,437	29,508
Defined benefit plans, Tax (expense) or benefit:
Defined benefit plans		(10,240)	(6,798)
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests		(1,588)	(4,340)
Net change		(11,828)	(11,138)
Defined benefit plans, Net of tax:
Defined benefit plans		21,538	9,112
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests		3,071	9,258
Net change		24,609	18,370
Defined benefit plans attributable to noncontrolling interests		5	79
Defined benefit plans attributable to Mitsubishi UFJ Financial Group		24,604	18,291
Foreign currency translation adjustments, Before tax:
Foreign currency translation adjustments		(35,954)	(833,911)
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests		2,961	2,641
Net change		(32,993)	(831,270)
Foreign currency translation adjustments, Tax (expense) or benefit:
Foreign currency translation adjustments		(2,932)	72,740
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests			(464)
Net change		(2,932)	72,276
Foreign currency translation adjustments, Net of tax:
Foreign currency translation adjustments		(38,886)	(761,171)
Reclassification adjustment for losses included in net income before attribution of noncontrolling interests		2,961	2,177
Net change		(35,925)	(758,994)
Foreign currency translation adjustments attributable to noncontrolling interests		2,043	(28,620)
Foreign currency translation adjustments attributable to Mitsubishi UFJ Financial Group		(37,968)	(730,374)
Other comprehensive income (loss) attributable to Mitsubishi UFJ Financial Group		¥ 233,319	¥ (824,439)
[1]	Unrealized gains of ¥9 million and ¥9 million, net of tax, related to debt securities with credit component were realized and included in net income before attribution of noncontrolling interests for the six months ended September 30, 2016 and 2017, respectively.

Accumulated Other Comprehensi77

Accumulated Other Comprehensive Income (Loss) (Reclassification of Significant Items out of Accumulated OCI) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains-net	[1]	¥ (176,149)	¥ (127,028)
Equity in earnings of equity method investees-net		(88,717)	(128,468)
Interest income on Loans, including fees		(1,098,107)	(997,030)
Other non-interest expenses		163,074	226,629
Income before tax		(1,014,434)	(1,005,788)
Income tax expense		234,336	252,472
Net of tax		(780,098)	(753,316)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before tax		(173,473)	(114,076)
Income tax expense		52,606	37,104
Net of tax		(120,867)	(76,972)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Losses (Gains) on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other		6,132	32,865
Income before tax		(175,398)	(120,742)
Income tax expense		52,011	38,139
Net of tax		(123,387)	(82,603)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Losses (Gains) on Investment Securities [Member] | Net Gains on Sales and Redemptions of Available-for-sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains-net		(181,530)	(153,607)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Debt Valuation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Equity in earnings of equity method investees-net		(111)	105
Income before tax		(111)	105
Income tax expense		34	(33)
Net of tax		(77)	72
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Losses (Gains) on Derivatives Qualifying for Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other		(113)	(36)
Income before tax		(5,584)	(9,678)
Income tax expense		2,149	3,802
Net of tax		(3,435)	(5,876)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Losses (Gains) on Derivatives Qualifying for Cash Flow Hedges [Member] | Interest Rate Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income on Loans, including fees		(5,471)	(9,642)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net actuarial loss	[2]	10,249	19,327
Prior service cost	[2]	(3,518)	(5,273)
Loss (gain) on settlements and curtailment, and other	[2]	(2,072)	(456)
Income before tax		4,659	13,598
Income tax expense		(1,588)	(4,340)
Net of tax		3,071	9,258
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest expenses		2,961	2,641
Income before tax		2,961	2,641
Income tax expense			(464)
Net of tax		¥ 2,961	¥ 2,177
[1]	The following credit losses are included in Investment securities gains-net: Decline in fair value by ¥44 million and ¥95 million; Other comprehensive income-net by ¥13 million and ¥13 million; Total credit losses by ¥57 million and ¥108 million, for the six months ended September 30, 2016 and 2017, respectively.
[2]	These Accumulated OCI components are included in the computation of net periodic benefit cost. See Note 7 for more information.

Noncontrolling Interests (Effec

Noncontrolling Interests (Effect on MUFG's Shareholders' Equity from Changes in Ownership of Subsidiaries) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Noncontrolling Interest [Abstract]
Net income attributable to Mitsubishi UFJ Financial Group	[1]	¥ 790,704	¥ 750,883
Transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders:
Purchase of shares of Mitsubishi UFJ NICOS from noncontrolling interest shareholder (Note 2)		(34,751)
Other		54
Net transfers to the noncontrolling interest shareholders		(34,697)
Change from net income attributable to Mitsubishi UFJ Financial Group and transactions between Mitsubishi UFJ Financial Group and the noncontrolling interest shareholders		¥ 756,007	¥ 750,883
[1]	From the six month period ended on September 30, 2017, information on earnings per common share ("EPS"), which was previously disclosed in the footnote to Condensed Consolidated Financial Statements, started to be disclosed within Condensed Consolidated Statements of Income.

Derivative Financial Instrume79

Derivative Financial Instruments (Narrative) (Detail) - JPY (¥) ¥ in Billions		6 Months Ended		12 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Cash Flow Hedge:
Derivative, Notional Amount	[1]	¥ 1,480,600		¥ 1,485,100
Credit Derivatives:
Carrying value of credit protection, offsetting with purchased protection with identical underlying referenced entities, in approximate		46		33
Notional amounts of credit protection, offsetting with purchased protection with identical underlying referenced entities, in approximate		2,337		2,327
Credit Risk, Liquidity Risk and Credit-risk-related Contingent Features:
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a liability position, in approximate		900		1,000
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a liability position, posted collateral, in approximate		224		251
Additional collateral amount which could be requested if the MUFG Group's debt falls below investment grade		68		81
Early termination amount which could be requested if the MUFG Group's debt falls below investment grade		¥ 76		¥ 79
MUAH [Member]
Cash Flow Hedge:
Approximate amount of income expected to be reclassified to net interest income during the twelve months ending June 30, 2018			¥ 2.7
Fair Value Hedges:
Type of fair value hedging instruments used in interest rate hedging strategy			Interest rate swaps
Objective for interest rate hedging strategy			Mitigates the changes in fair value of the hedged liability caused by changes in the designated benchmark interest rate, U.S. dollar LIBOR
MUAH [Member] | Interest Rate Swap I [Member]
Cash Flow Hedge:
Derivative, Description of hedged item			Benchmark interest rate on LIBOR indexed loans
MUAH [Member] | Interest Rate Swap I [Member] | Maximum [Member]
Fair Value Hedges:
Losses on the hedging instruments			¥ 1
Gains on the hedged liability			¥ 1
MUAH [Member] | Interest Rate Swap II [Member]
Cash Flow Hedge:
Derivative, Description of hedged item			Benchmark interest rate on LIBOR indexed short-term borrowings
MUAH [Member] | Cash Flow Hedging [Member] | Weighted Average [Member]
Cash Flow Hedge:
Remaining life of the active cash flow hedges, in years			4 years
MUAH [Member] | Cash Flow Hedging [Member] | Interest Rate Swap I [Member]
Cash Flow Hedge:
Derivative, Notional Amount			¥ 1,220.8
MUAH [Member] | Cash Flow Hedging [Member] | Interest Rate Swap II [Member]
Cash Flow Hedge:
Derivative, Notional Amount			¥ 32.5
[1]	Includes both written and purchased positions.

Derivative Financial Instrume80

Derivative Financial Instruments (Notional Amounts of Derivative Contracts) (Detail) - JPY (¥) ¥ in Trillions		Sep. 30, 2017	Mar. 31, 2017
Derivative [Line Items]
Notional amounts of derivatives	[1]	¥ 1,480.6	¥ 1,485.1
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	1,240.5	1,252.7
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	222.6	216.9
Equity Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	6.7	4.7
Commodity Contracts [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	0.4	0.5
Credit Derivatives [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	6.2	6
Others [Member]
Derivative [Line Items]
Notional amounts of derivatives	[1]	¥ 4.2	¥ 4.3
[1]	Includes both written and purchased positions.

Derivative Financial Instrume81

Derivative Financial Instruments (Fair Value Information on Derivative Instruments Recorded on Condensed Consolidated Balance Sheets) (Detail) - JPY (¥) ¥ in Billions		Sep. 30, 2017	Mar. 31, 2017
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	¥ 16,256	¥ 18,835
Fair value of derivative liabilities	[1],[2],[3]	16,273	18,562
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	12,211	14,242
Fair value of derivative liabilities	[1],[2],[3]	12,265	14,328
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	3,742	4,301
Fair value of derivative liabilities	[1],[2],[3]	3,752	4,084
Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	206	188
Fair value of derivative liabilities	[1],[2],[3]	253	182
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	29	35
Fair value of derivative liabilities	[1],[2],[3]	27	31
Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	67	67
Fair value of derivative liabilities	[1],[2],[3]	68	58
Others [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[3]	1	2
Fair value of derivative liabilities	[1],[2],[3],[4]	(92)	(121)
Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	16,255	18,833
Fair value of derivative liabilities	[1],[2],[5]	16,253	18,539
Not Designated as Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	12,210	14,240
Fair value of derivative liabilities	[1],[2],[5]	12,245	14,305
Not Designated as Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	3,742	4,301
Fair value of derivative liabilities	[1],[2],[5]	3,752	4,084
Not Designated as Hedging Instruments [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	206	188
Fair value of derivative liabilities	[1],[2],[5]	253	182
Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	29	35
Fair value of derivative liabilities	[1],[2],[5]	27	31
Not Designated as Hedging Instruments [Member] | Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	67	67
Fair value of derivative liabilities	[1],[2],[5]	68	58
Not Designated as Hedging Instruments [Member] | Others [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[5]	1	2
Fair value of derivative liabilities	[1],[2],[4],[5]	(92)	(121)
Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]	1	2
Fair value of derivative liabilities	[1],[2],[6]	20	23
Designated as Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]	1	2
Fair value of derivative liabilities	[1],[2],[6]	20	23
Designated as Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]
Fair value of derivative liabilities	[1],[2],[6]
Designated as Hedging Instruments [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]
Fair value of derivative liabilities	[1],[2],[6]
Designated as Hedging Instruments [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]
Fair value of derivative liabilities	[1],[2],[6]
Designated as Hedging Instruments [Member] | Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]
Fair value of derivative liabilities	[1],[2],[6]
Designated as Hedging Instruments [Member] | Others [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	[1],[2],[6]
Fair value of derivative liabilities	[1],[2],[4],[6]
[1]	For more information about fair value measurement and assumptions used to measure the fair value of derivatives, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.
[2]	The fair value of derivative instruments is presented on a gross basis even when derivative instruments are subject to master netting agreements. Cash collateral payable and receivable associated with derivative instruments are not added to or netted against the fair value amounts.
[3]	This table does not include contracts with embedded derivatives for which the fair value option has been elected.
[4]	Others include mainly bifurcated embedded derivatives carried at fair value, which are presented in Deposits and Long-term debt.
[5]	The derivative instruments which are not designated as a hedging instrument are held for trading and risk management purposes, and are presented in Trading account assets/liabilities except for (4).
[6]	The MUFG Group adopts hedging strategies and applies hedge accounting to certain derivative transactions entered into by MUAH. The derivative instruments which are designated as hedging instruments are presented in Other assets or Other liabilities on the accompanying condensed consolidated balance sheets.

Derivative Financial Instrume82

Derivative Financial Instruments (Gains and Losses for Trading and Risk Management Derivatives (Not Designated as Hedging Instruments)) (Detail) - Not Designated as Hedging Instruments [Member] - JPY (¥) ¥ in Billions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	¥ (352)	¥ 222
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(8)	67
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(158)	179
Equity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(146)	(20)
Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses		1
Credit Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(1)	13
Others [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(39)	(18)
Foreign Exchange Gains (Losses)-Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(159)	181
Foreign Exchange Gains (Losses)-Net [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses
Foreign Exchange Gains (Losses)-Net [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(158)	179
Foreign Exchange Gains (Losses)-Net [Member] | Equity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses
Foreign Exchange Gains (Losses)-Net [Member] | Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses
Foreign Exchange Gains (Losses)-Net [Member] | Credit Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses
Foreign Exchange Gains (Losses)-Net [Member] | Others [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(1)	2
Trading Account Profits (Losses)-Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(193)	41
Trading Account Profits (Losses)-Net [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(8)	67
Trading Account Profits (Losses)-Net [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses
Trading Account Profits (Losses)-Net [Member] | Equity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(146)	(20)
Trading Account Profits (Losses)-Net [Member] | Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses		1
Trading Account Profits (Losses)-Net [Member] | Credit Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	(1)	13
Trading Account Profits (Losses)-Net [Member] | Others [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Trading and risk management derivatives gains and losses	¥ (38)	¥ (20)

Derivative Financial Instrume83

Derivative Financial Instruments (Gains and Losses for Derivatives Designated as Cash Flow Hedges) (Detail) - Designated as Hedging Instruments [Member] - Cash Flow Hedging [Member] - JPY (¥) ¥ in Billions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gains recognized in Accumulated OCI on derivative instruments (Effective portion)		¥ 4	¥ 46
Gains reclassified from Accumulated OCI into income (Effective portion)		6	10
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains recognized in Accumulated OCI on derivative instruments (Effective portion)		4	46
Gains reclassified from Accumulated OCI into income (Effective portion)	[1]	¥ 6	¥ 10
[1]	Included in Interest income.

Derivative Financial Instrume84

Derivative Financial Instruments (Protection Sold Through Credit Default Swaps) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		¥ 783,828	¥ 816,219
Maximum potential/Notional amount, Expiring in 1-5 years		1,917,519	1,973,754
Maximum potential/Notional amount, Expiring over 5 years		210,677	122,156
Maximum potential/Notional amount, Total		2,912,024	2,912,129
Credit derivative (asset) liability at fair value	[1]	(54,903)	(39,586)
Credit Default Swaps Sold [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		783,828	816,219
Maximum potential/Notional amount, Expiring in 1-5 years		1,838,608	1,895,201
Maximum potential/Notional amount, Expiring over 5 years		210,677	122,156
Maximum potential/Notional amount, Total		2,833,113	2,833,576
Credit derivative (asset) liability at fair value	[1]	(54,908)	(39,586)
Credit Default Swaps Sold [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		695,693	740,991
Maximum potential/Notional amount, Expiring in 1-5 years		1,302,716	1,304,996
Maximum potential/Notional amount, Expiring over 5 years		72,093	36,073
Maximum potential/Notional amount, Total		2,070,502	2,082,060
Credit derivative (asset) liability at fair value	[1]	(29,087)	(19,867)
Credit Default Swaps Sold [Member] | Single Name Credit Default Swaps [Member] | Investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less	[2]	542,236	627,355
Maximum potential/Notional amount, Expiring in 1-5 years	[2]	995,380	949,129
Maximum potential/Notional amount, Expiring over 5 years	[2]	65,303	29,493
Maximum potential/Notional amount, Total	[2]	1,602,919	1,605,977
Credit derivative (asset) liability at fair value	[1],[2]	(26,542)	(21,005)
Credit Default Swaps Sold [Member] | Single Name Credit Default Swaps [Member] | Non-investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		151,212	107,663
Maximum potential/Notional amount, Expiring in 1-5 years		303,399	349,886
Maximum potential/Notional amount, Expiring over 5 years		6,790	6,580
Maximum potential/Notional amount, Total		461,401	464,129
Credit derivative (asset) liability at fair value	[1]	(2,283)	1,654
Credit Default Swaps Sold [Member] | Single Name Credit Default Swaps [Member] | Not Rated [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		2,245	5,973
Maximum potential/Notional amount, Expiring in 1-5 years		3,937	5,981
Maximum potential/Notional amount, Expiring over 5 years
Maximum potential/Notional amount, Total		6,182	11,954
Credit derivative (asset) liability at fair value	[1]	(262)	(516)
Credit Default Swaps Sold [Member] | Index and Basket Credit Default Swaps Sold [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		88,135	75,228
Maximum potential/Notional amount, Expiring in 1-5 years		535,892	590,205
Maximum potential/Notional amount, Expiring over 5 years		138,584	86,083
Maximum potential/Notional amount, Total		762,611	751,516
Credit derivative (asset) liability at fair value	[1]	(25,821)	(19,719)
Credit Default Swaps Sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | BTMU [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		21,000	24,000
Maximum potential/Notional amount, Expiring in 1-5 years		144,753	250,480
Maximum potential/Notional amount, Expiring over 5 years		114,187	85,083
Maximum potential/Notional amount, Total		279,940	359,563
Credit derivative (asset) liability at fair value	[1]	(5,169)	(4,982)
Credit Default Swaps Sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | BTMU [Member] | Investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less	[2]	18,000	7,000
Maximum potential/Notional amount, Expiring in 1-5 years	[2]	81,624	198,335
Maximum potential/Notional amount, Expiring over 5 years	[2]	104,041	63,767
Maximum potential/Notional amount, Total	[2]	203,665	269,102
Credit derivative (asset) liability at fair value	[1],[2]	(4,191)	(4,145)
Credit Default Swaps Sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | BTMU [Member] | Non-investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		3,000	17,000
Maximum potential/Notional amount, Expiring in 1-5 years		63,129	52,145
Maximum potential/Notional amount, Expiring over 5 years		10,146	21,316
Maximum potential/Notional amount, Total		76,275	90,461
Credit derivative (asset) liability at fair value	[1]	(978)	(837)
Credit Default Swaps Sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | MUSHD [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		67,135	51,228
Maximum potential/Notional amount, Expiring in 1-5 years		391,139	339,725
Maximum potential/Notional amount, Expiring over 5 years		24,397	1,000
Maximum potential/Notional amount, Total		482,671	391,953
Credit derivative (asset) liability at fair value	[1]	(20,652)	(14,737)
Credit Default Swaps Sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | MUSHD [Member] | Investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less	[2]	21,000	14,000
Maximum potential/Notional amount, Expiring in 1-5 years	[2]	106,763	72,192
Maximum potential/Notional amount, Expiring over 5 years	[2]	23,500	1,000
Maximum potential/Notional amount, Total	[2]	151,263	87,192
Credit derivative (asset) liability at fair value	[1],[2]	(3,146)	(1,278)
Credit Default Swaps Sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | MUSHD [Member] | Non-investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		15,000	21,000
Maximum potential/Notional amount, Expiring in 1-5 years		45,000	73,000
Maximum potential/Notional amount, Expiring over 5 years
Maximum potential/Notional amount, Total		60,000	94,000
Credit derivative (asset) liability at fair value	[1]	(1,206)	(1,725)
Credit Default Swaps Sold [Member] | Index and Basket Credit Default Swaps Sold [Member] | MUSHD [Member] | Not Rated [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less		31,135	16,228
Maximum potential/Notional amount, Expiring in 1-5 years		239,376	194,533
Maximum potential/Notional amount, Expiring over 5 years		897
Maximum potential/Notional amount, Total		271,408	210,761
Credit derivative (asset) liability at fair value	[1]	(16,300)	(11,734)
Other Credit Derivatives Sold [Member] | Investment Grade [Member]
Credit Derivatives [Line Items]
Maximum potential/Notional amount, Expiring in 1 year or less	[3]
Maximum potential/Notional amount, Expiring in 1-5 years	[3]	78,911	78,553
Maximum potential/Notional amount, Expiring over 5 years	[3]
Maximum potential/Notional amount, Total	[3]	78,911	78,553
Credit derivative (asset) liability at fair value	[1],[3]	¥ 5
[1]	Fair value amounts are shown on a gross basis prior to cash collateral or counterparty netting.
[2]	The MUFG Group considers ratings of Baa3/BBB- or higher to meet the definition of investment grade.
[3]	Other credit derivatives primarily consist of total return swaps.

Obligations under Guarantees 85

Obligations under Guarantees and Other Off-balance Sheet Instruments (Contractual or Notional Amounts of Guarantees) (Detail) - JPY (¥) ¥ in Billions		Sep. 30, 2017	Mar. 31, 2017
Guarantor Obligations [Line Items]
Contractual or Notional amount		¥ 59,962	¥ 60,558
Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount		3,878	3,775
Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount		3,079	2,968
Derivative Instruments [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount	[1],[2]	43,752	44,249
Liabilities of Trust Accounts [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount		¥ 9,253	9,561
Others [Member]
Guarantor Obligations [Line Items]
Contractual or Notional amount			¥ 5
[1]	Credit derivatives sold by the MUFG Group are excluded from this presentation.
[2]	Derivative instruments that are deemed to be included within the definition of guarantees as prescribed in the guidance on guarantees include certain written options and credit default swaps.

Obligations under Guarantees 86

Obligations under Guarantees and Other Off-balance Sheet Instruments (Maximum Potential Amount of Future Payments Classified Based upon Internal Credit Ratings) (Detail) - JPY (¥) ¥ in Billions		6 Months Ended	12 Months Ended
		Sep. 30, 2017	Mar. 31, 2017
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		¥ 59,962	¥ 60,558
Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		3,878	3,775
Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		3,079	2,968
Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		6,957	6,743
Standby Letters of Credit, Financial and Performance Guarantees [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		3,878	3,775
Standby Letters of Credit, Financial and Performance Guarantees [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		3,079	2,968
Normal [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		6,662	6,460
Normal [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		3,771	3,629
Normal [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		¥ 2,891	¥ 2,831
Close Watch [Member] | Minimum [Member]
Guarantor Obligations [Line Items]
Accruing loans contractually past due, in day		90 days	90 days
Close Watch [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade	[1]	¥ 217	¥ 215
Close Watch [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade	[1]	86	119
Close Watch [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade	[1]	131	96
Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade	[2]	51	35
Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade	[2]	19	24
Likely to Become Bankrupt or Legally / Virtually Bankrupt [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade	[2]	32	11
Not Rated [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		27	33
Not Rated [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Standby Letters of Credit and Financial Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		2	3
Not Rated [Member] | Standby Letters of Credit, Financial and Performance Guarantees [Member] | Performance Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential / Contractual or Notional amount, Total amount by borrower grade		¥ 25	¥ 30
[1]	Borrowers classified as Close Watch represent those that require close monitoring as the borrower has begun to exhibit elements of potential concern with respect to its business performance and financial condition, the borrower has begun to exhibit elements of serious concern with respect to its business performance and financial condition, including business problems requiring long-term solutions, or the borrower's loans are TDRs or loans contractually past due 90 days or more for special reasons.
[2]	Borrowers classified as Likely to become Bankrupt or Legally/Virtually Bankrupt represent those that have a higher probability of default than those categorized as Close Watch due to serious debt repayment problems with poor progress in achieving restructuring plans, the borrower being considered virtually bankrupt with no prospects for an improvement in business operations, or the borrower being legally bankrupt with no prospects for continued business operations because of non-payment, suspension of business, voluntary liquidation or filing for legal liquidation.

Obligations under Guarantees 87

Obligations under Guarantees and Other Off-balance Sheet Instruments (Contractual Amounts with Regard to Other Off-balance Sheet Instruments) (Detail) - JPY (¥) ¥ in Billions	Sep. 30, 2017	Mar. 31, 2017
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with regard to other off-balance sheet instruments	¥ 81,788	¥ 84,334
Commercial Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with regard to other off-balance sheet instruments	1,282	1,214
Commitments to Make Investments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with regard to other off-balance sheet instruments	143	135
Other [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts with regard to other off-balance sheet instruments	¥ 13	¥ 13

Contingent Liabilities (Narrati

Contingent Liabilities (Narrative) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2017	Mar. 31, 2017
Contingent Liabilities [Line Items]
Limit on aggregate credit extensions over the borrower's annual income	33.333%
Allowance for repayment of excess interest	¥ 30,857	¥ 39,414
Maximum [Member]
Contingent Liabilities [Line Items]
Previous permissible interest rate under the Japanese Act Regulating the Receipt of Contributions, the Receipt of Deposits, and Interest Rates	29.20%
Current permissible interest rate under the Japanese Act Regulating the Receipt of Contributions, the Receipt of Deposits, and Interest Rates	20.00%
Interest rate under the Interest Rate Restriction Act previously subject to gray-zone interest rates	20.00%
Minimum [Member]
Contingent Liabilities [Line Items]
Interest rate under the Interest Rate Restriction Act previously subject to gray-zone interest rates	15.00%

Variable Interest Entities (Ass

Variable Interest Entities (Assets and Liabilities of Consolidated Variable Interest Entities) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016
Variable Interest Entity [Line Items]
Total assets		¥ 300,400,980	¥ 297,185,019
Consolidated assets, Cash and due from banks		30,987,492	25,682,741	¥ 20,973,925	¥ 8,656,322
Consolidated assets, Interest-earning deposits in other banks		39,128,016	38,327,029
Consolidated assets, Trading account assets		41,390,111	41,320,049
Consolidated assets, Investment securities		40,613,631	43,233,581
Consolidated assets, Loans		117,319,242	117,032,784
Total liabilities		284,920,607	282,420,311
Consolidated liabilities, Deposits		191,784,775	190,401,623
Consolidated liabilities, Long-term debt		30,133,040	27,743,443
Consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Total assets		19,944,347	15,173,861
Consolidated assets, Cash and due from banks		191	186
Consolidated assets, Interest-earning deposits in other banks		17,227	12,048
Consolidated assets, Trading account assets		575,210	539,809
Consolidated assets, Investment securities		1,784,178	1,637,587
Consolidated assets, Loans		17,242,982	12,713,190
Consolidated assets, All other assets		324,559	271,041
Total liabilities		741,525	619,462
Consolidated liabilities, Deposits
Consolidated liabilities, Other short-term borrowings		39,694	22,044
Consolidated liabilities, Long-term debt		585,826	547,971
Consolidated liabilities, All other liabilities		116,005	49,447
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member]
Variable Interest Entity [Line Items]
Total assets		26,529,153	21,963,022
Consolidated assets, Cash and due from banks		30,953	49,038
Consolidated assets, Interest-earning deposits in other banks		57,001	84,554
Consolidated assets, Trading account assets		581,371	556,723
Consolidated assets, Investment securities		1,863,563	1,706,673
Consolidated assets, Loans		23,650,961	19,276,160
Consolidated assets, All other assets		345,304	289,874
Total liabilities		25,668,166	21,149,739
Consolidated liabilities, Deposits		6,520,112	6,676,198
Consolidated liabilities, Other short-term borrowings		5,379,832	5,477,471
Consolidated liabilities, Long-term debt		12,961,163	8,317,087
Consolidated liabilities, All other liabilities		807,059	678,983
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Asset-backed Conduits [Member]
Variable Interest Entity [Line Items]
Total assets		7,409,619	7,332,485
Consolidated assets, Cash and due from banks		30,602	48,688
Consolidated assets, Interest-earning deposits in other banks		21,099	34,690
Consolidated assets, Trading account assets		7,251	23,423
Consolidated assets, Investment securities		1,600,634	1,485,377
Consolidated assets, Loans		5,742,584	5,733,202
Consolidated assets, All other assets		7,449	7,105
Total liabilities		7,424,800	7,357,874
Consolidated liabilities, Other short-term borrowings		5,304,961	5,397,811
Consolidated liabilities, Long-term debt		1,477,059	1,379,498
Consolidated liabilities, All other liabilities		642,780	580,565
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Total assets		804,668	712,694
Consolidated assets, Interest-earning deposits in other banks		6,521	9,020
Consolidated assets, Trading account assets		557,165	511,924
Consolidated assets, Investment securities		13,512	15,611
Consolidated assets, All other assets		227,470	176,139
Total liabilities		55,828	2,882
Consolidated liabilities, All other liabilities		55,828	2,882
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Special Purpose Entities Created for Structured Financing [Member]
Variable Interest Entity [Line Items]
Total assets		210,698	226,380
Consolidated assets, Interest-earning deposits in other banks		1,964	2,310
Consolidated assets, Loans		159,922	172,008
Consolidated assets, All other assets		48,812	52,062
Total liabilities		125,498	135,667
Consolidated liabilities, Other short-term borrowings		314	573
Consolidated liabilities, Long-term debt		121,152	128,804
Consolidated liabilities, All other liabilities		4,032	6,290
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Repackaged Instruments [Member]
Variable Interest Entity [Line Items]
Total assets		112,879	77,211
Consolidated assets, Trading account assets		16,638	20,783
Consolidated assets, Investment securities		96,241	56,428
Total liabilities		111,951	76,713
Consolidated liabilities, Other short-term borrowings		13,194	4,000
Consolidated liabilities, Long-term debt		94,531	72,096
Consolidated liabilities, All other liabilities		4,226	617
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Securitization of MUFG Group's Assets [Member]
Variable Interest Entity [Line Items]
Total assets	[1]	11,335,610	6,798,561
Consolidated assets, Loans	[1]	11,310,184	6,775,344
Consolidated assets, All other assets	[1]	25,426	23,217
Total liabilities	[1]	11,302,407	6,768,108
Consolidated liabilities, Other short-term borrowings	[1]	29,849	29,637
Consolidated liabilities, Long-term debt	[1]	11,266,685	6,734,855
Consolidated liabilities, All other liabilities	[1]	5,873	3,616
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Securitization of MUFG Group's Assets [Member] | Housing Loan Trusts [Member]
Variable Interest Entity [Line Items]
Total assets		10,387,311	5,793,956
Total liabilities		10,387,311	5,793,956
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Trust Arrangements [Member]
Variable Interest Entity [Line Items]
Total assets		6,604,632	6,749,808
Consolidated assets, Interest-earning deposits in other banks		8,381	7,681
Consolidated assets, Trading account assets		317	593
Consolidated assets, Investment securities		153,134	149,205
Consolidated assets, Loans		6,423,380	6,578,701
Consolidated assets, All other assets		19,420	13,628
Total liabilities		6,597,674	6,743,464
Consolidated liabilities, Deposits		6,520,112	6,676,198
Consolidated liabilities, All other liabilities		77,562	67,266
Consolidated VIEs [Member] | Consolidated VIEs before Elimination [Member] | Others [Member]
Variable Interest Entity [Line Items]
Total assets		51,047	65,883
Consolidated assets, Cash and due from banks		351	350
Consolidated assets, Interest-earning deposits in other banks		19,036	30,853
Consolidated assets, Investment securities		42	52
Consolidated assets, Loans		14,891	16,905
Consolidated assets, All other assets		16,727	17,723
Total liabilities		50,008	65,031
Consolidated liabilities, Other short-term borrowings		31,514	45,450
Consolidated liabilities, Long-term debt		1,736	1,834
Consolidated liabilities, All other liabilities		16,758	17,747
Consolidated VIEs [Member] | Amounts Eliminated in Consolidation [Member]
Variable Interest Entity [Line Items]
Total assets		(6,584,806)	(6,789,161)
Consolidated assets, Cash and due from banks		(30,762)	(48,852)
Consolidated assets, Interest-earning deposits in other banks		(39,774)	(72,506)
Consolidated assets, Trading account assets		(6,161)	(16,914)
Consolidated assets, Investment securities		(79,385)	(69,086)
Consolidated assets, Loans		(6,407,979)	(6,562,970)
Consolidated assets, All other assets		(20,745)	(18,833)
Total liabilities		(15,403,314)	(10,843,144)
Consolidated liabilities, Other short-term borrowings		(2,976,786)	(3,034,973)
Consolidated liabilities, Long-term debt		(12,374,752)	(7,766,722)
Consolidated liabilities, All other liabilities		(51,776)	(41,449)
Consolidated VIEs [Member] | Amount of Liabilities with Recourse to General Credit of MUFG Group [Member]
Variable Interest Entity [Line Items]
Total liabilities		(9,523,327)	(9,687,133)
Consolidated liabilities, Deposits		(6,520,112)	(6,676,198)
Consolidated liabilities, Other short-term borrowings		(2,363,352)	(2,420,454)
Consolidated liabilities, Long-term debt		(585)	(2,394)
Consolidated liabilities, All other liabilities		¥ (639,278)	¥ (588,087)
[1]	Securitization of the MUFG Group's assets includes ¥5,793,956 million and ¥10,387,311 million of assets primarily consisting of loans and the same amounts of liabilities primarily consisting of long-term debt relating to eligible beneficiary interests in housing loan trusts as of March 31, 2017 and September 30, 2017, respectively. For more information, see analysis of each transaction category in Note 26 to the consolidated financial statements for the fiscal year ended March 31, 2017.

Variable Interest Entities (A90

Variable Interest Entities (Assets and Liabilities of Non-consolidated Variable Interest Entities) (Detail) - Non-consolidated VIEs [Member] - JPY (¥) ¥ in Millions	Sep. 30, 2017	Mar. 31, 2017
Variable Interest Entity [Line Items]
Total assets	¥ 177,189,742	¥ 163,046,939
Maximum exposure	18,127,466	18,001,431
On-balance sheet assets, Total assets	14,570,082	14,308,274
On-balance sheet assets, Trading account assets	1,600,583	1,161,395
On-balance sheet assets, Investment securities	3,301,134	3,500,088
On-balance sheet assets, Loans	9,514,566	9,467,903
On-balance sheet assets, All other assets	153,799	178,888
On-balance sheet liabilities, Total liabilities	25,786	23,295
On-balance sheet liabilities, All other liabilities	25,786	23,295
Asset-backed Conduits [Member]
Variable Interest Entity [Line Items]
Total assets	29,441,674	29,604,929
Maximum exposure	5,828,075	5,608,909
On-balance sheet assets, Total assets	4,605,800	4,383,707
On-balance sheet assets, Trading account assets	1,053	1,072
On-balance sheet assets, Investment securities	1,391,427	1,236,094
On-balance sheet assets, Loans	3,213,320	3,146,541
On-balance sheet liabilities, Total liabilities	1	1
On-balance sheet liabilities, All other liabilities	1	1
Investment Funds [Member]
Variable Interest Entity [Line Items]
Total assets	36,442,349	30,591,880
Maximum exposure	1,588,251	1,674,567
On-balance sheet assets, Total assets	1,410,293	1,396,830
On-balance sheet assets, Trading account assets	297,533	200,651
On-balance sheet assets, Investment securities	723,493	829,641
On-balance sheet assets, Loans	381,111	356,828
On-balance sheet assets, All other assets	8,156	9,710
On-balance sheet liabilities, Total liabilities	206	98
On-balance sheet liabilities, All other liabilities	206	98
Special Purpose Entities Created for Structured Financing [Member]
Variable Interest Entity [Line Items]
Total assets	41,923,186	40,710,546
Maximum exposure	4,637,770	4,717,235
On-balance sheet assets, Total assets	3,643,692	3,699,415
On-balance sheet assets, Trading account assets	335,081	279,471
On-balance sheet assets, Investment securities	150,068	147,543
On-balance sheet assets, Loans	3,110,595	3,207,369
On-balance sheet assets, All other assets	47,948	65,032
On-balance sheet liabilities, Total liabilities	6,581	4,657
On-balance sheet liabilities, All other liabilities	6,581	4,657
Repackaged Instruments [Member]
Variable Interest Entity [Line Items]
Total assets	8,964,605	10,127,497
Maximum exposure	2,173,225	2,269,149
On-balance sheet assets, Total assets	2,094,314	2,104,697
On-balance sheet assets, Trading account assets	844,913	581,912
On-balance sheet assets, Investment securities	973,966	1,203,181
On-balance sheet assets, Loans	251,656	294,703
On-balance sheet assets, All other assets	23,779	24,901
Others [Member]
Variable Interest Entity [Line Items]
Total assets	60,417,928	52,012,087
Maximum exposure	3,900,145	3,731,571
On-balance sheet assets, Total assets	2,815,983	2,723,625
On-balance sheet assets, Trading account assets	122,003	98,289
On-balance sheet assets, Investment securities	62,180	83,629
On-balance sheet assets, Loans	2,557,884	2,462,462
On-balance sheet assets, All other assets	73,916	79,245
On-balance sheet liabilities, Total liabilities	18,998	18,539
On-balance sheet liabilities, All other liabilities	¥ 18,998	¥ 18,539

Business Segments (Narrative) (

Business Segments (Narrative) (Detail) ¥ in Billions		6 Months Ended
		Sep. 30, 2017JPY (¥)Offices	Sep. 30, 2016JPY (¥)
Segment Reporting Information [Line Items]
Operating profit (loss)		¥ 688.8	¥ 716.2
Global Business Group [Member]
Segment Reporting Information [Line Items]
Number of offices outside Japan | Offices		1,200
Business Segment [Member] | Customer Business [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	¥ 539.4	542.9
Business Segment [Member] | Customer Business [Member] | Corporate Banking Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	190.2	212.8
Business Segment [Member] | Customer Business [Member] | Retail Banking Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)		124.9	104.3
Business Segment [Member] | Customer Business [Member] | Global Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	206.9	205.8
Business Segment [Member] | Global Markets Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)		207.2	247.1
Business Segment, Other [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)		¥ (57.8)	(73.8)
Modification Impact [Member] | Refining Definition [Member] | Business Segment [Member] | Customer Business [Member] | Corporate Banking Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)			8.4
Modification Impact [Member] | Internal Management Accounting Rules And Practices [Member] | Business Segment [Member] | Customer Business [Member] | Corporate Banking Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)			(4)
Modification Impact [Member] | Internal Management Accounting Rules And Practices [Member] | Business Segment [Member] | Customer Business [Member] | Retail Banking Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)			0.2
Modification Impact [Member] | Internal Management Accounting Rules And Practices [Member] | Business Segment [Member] | Customer Business [Member] | Global Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)			(0.9)
Modification Impact [Member] | Internal Management Accounting Rules And Practices [Member] | Business Segment [Member] | Global Markets Business Group [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)			(9.4)
Modification Impact [Member] | Internal Management Accounting Rules And Practices [Member] | Business Segment, Other [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)			¥ 10.4
[1]	Net revenue, operating expenses, and operating profit relating to the overseas Japanese Corporate business were ¥78.7 billion, ¥69.0 billion, and ¥9.7 billion for the six months ended September 30, 2016, and ¥92.8 billion, ¥76.4 billion, and ¥16.4 billion for the six months ended September 30, 2017, respectively. To eliminate the double-counting of these amounts, adjustments have been made to the Total of Customer Business. These amounts have been restated in accordance with the modifications resulting in the restatement of the prior period business segment information.

Business Segments (Financial In

Business Segments (Financial Information by Business Segment) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Business segment information
Net revenue		¥ 2,060,400	¥ 2,015,200
Net interest income		1,120,246	1,105,413
Operating expenses		1,371,600	1,299,000
Operating profit (loss)		688,800	716,200
BTMU and MUTB [Member]
Business segment information
Net revenue		1,109,600	1,164,700
Net interest income		592,400	625,700
Net fees		318,100	328,700
Other		199,100	210,300
Other than BTMU and MUTB [Member]
Business segment information
Net revenue	[1]	950,800	850,500
Overseas Japanese Corporate Business [Member]
Business segment information
Net revenue		92,800	78,700
Operating expenses		76,400	69,000
Operating profit (loss)		16,400	9,700
Business Segment [Member] | Customer Business [Member]
Business segment information
Net revenue	[2]	1,712,300	1,661,600
Operating expenses	[2]	1,172,900	1,118,700
Operating profit (loss)	[2]	539,400	542,900
Business Segment [Member] | Customer Business [Member] | BTMU and MUTB [Member]
Business segment information
Net revenue	[2]	827,300	836,200
Net interest income	[2]	411,000	404,900
Net fees	[2]	366,200	376,100
Other	[2]	50,100	55,200
Business Segment [Member] | Customer Business [Member] | Other than BTMU and MUTB [Member]
Business segment information
Net revenue	[1],[2]	885,000	825,400
Business Segment [Member] | Customer Business [Member] | Retail Banking Business Group [Member]
Business segment information
Net revenue		599,800	584,000
Operating expenses		474,900	479,700
Operating profit (loss)		124,900	104,300
Business Segment [Member] | Customer Business [Member] | Retail Banking Business Group [Member] | BTMU and MUTB [Member]
Business segment information
Net revenue		233,500	243,000
Net interest income		165,900	168,200
Net fees		64,900	71,500
Other		2,700	3,300
Business Segment [Member] | Customer Business [Member] | Retail Banking Business Group [Member] | Other than BTMU and MUTB [Member]
Business segment information
Net revenue	[1]	366,300	341,000
Business Segment [Member] | Customer Business [Member] | Corporate Banking Business Group [Member]
Business segment information
Net revenue	[2]	480,400	495,600
Operating expenses	[2]	290,200	282,800
Operating profit (loss)	[2]	190,200	212,800
Business Segment [Member] | Customer Business [Member] | Corporate Banking Business Group [Member] | BTMU and MUTB [Member]
Business segment information
Net revenue	[2]	390,700	403,600
Net interest income	[2]	162,400	162,900
Net fees	[2]	187,000	196,200
Other	[2]	41,300	44,500
Business Segment [Member] | Customer Business [Member] | Corporate Banking Business Group [Member] | Other than BTMU and MUTB [Member]
Business segment information
Net revenue	[1],[2]	89,700	92,000
Business Segment [Member] | Customer Business [Member] | Global Business Group [Member]
Business segment information
Net revenue	[2]	633,600	578,100
Operating expenses	[2]	426,700	372,300
Operating profit (loss)	[2]	206,900	205,800
Business Segment [Member] | Customer Business [Member] | Global Business Group [Member] | BTMU and MUTB [Member]
Business segment information
Net revenue	[2]	219,800	200,700
Net interest income	[2]	112,300	92,200
Net fees	[2]	86,800	87,000
Other	[2]	20,700	21,500
Business Segment [Member] | Customer Business [Member] | Global Business Group [Member] | Other than BTMU and MUTB [Member]
Business segment information
Net revenue	[1],[2]	413,800	377,400
Business Segment [Member] | Customer Business [Member] | Trust Assets Business Group [Member]
Business segment information
Net revenue		91,300	82,600
Operating expenses		57,500	52,900
Operating profit (loss)		33,800	29,700
Business Segment [Member] | Customer Business [Member] | Trust Assets Business Group [Member] | BTMU and MUTB [Member]
Business segment information
Net revenue		41,900	35,100
Net fees		41,900	35,100
Business Segment [Member] | Customer Business [Member] | Trust Assets Business Group [Member] | Other than BTMU and MUTB [Member]
Business segment information
Net revenue	[1]	49,400	47,500
Business Segment [Member] | Global Markets Business Group [Member]
Business segment information
Net revenue		319,800	348,400
Operating expenses		112,600	101,300
Operating profit (loss)		207,200	247,100
Business Segment [Member] | Global Markets Business Group [Member] | BTMU and MUTB [Member]
Business segment information
Net revenue		223,900	256,900
Net interest income		68,500	93,100
Net fees		(9,500)	(2,600)
Other		164,900	166,400
Business Segment [Member] | Global Markets Business Group [Member] | Other than BTMU and MUTB [Member]
Business segment information
Net revenue	[1]	95,900	91,500
Business Segment, Other [Member]
Business segment information
Net revenue		28,300	5,200
Operating expenses		86,100	79,000
Operating profit (loss)		(57,800)	(73,800)
Business Segment, Other [Member] | BTMU and MUTB [Member]
Business segment information
Net revenue		58,400	71,600
Net interest income		112,900	127,700
Net fees		(38,600)	(44,800)
Other		(15,900)	(11,300)
Business Segment, Other [Member] | Other than BTMU and MUTB [Member]
Business segment information
Net revenue	[1]	¥ (30,100)	¥ (66,400)
[1]	Includes MUFG and its subsidiaries other than BTMU on a stand-alone basis and MUTB on a stand-alone basis.
[2]	Net revenue, operating expenses, and operating profit relating to the overseas Japanese Corporate business were ¥78.7 billion, ¥69.0 billion, and ¥9.7 billion for the six months ended September 30, 2016, and ¥92.8 billion, ¥76.4 billion, and ¥16.4 billion for the six months ended September 30, 2017, respectively. To eliminate the double-counting of these amounts, adjustments have been made to the Total of Customer Business. These amounts have been restated in accordance with the modifications resulting in the restatement of the prior period business segment information.

Business Segments (Reconciliati

Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Condensed Consolidated Statements of Income) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	¥ 688,800	¥ 716,200
Credit for credit losses	186,568	58,681
Foreign exchange gains-net	(3,025)	(20,704)
Trading account profits (losses)-net	69,428	284,845
Equity in earnings of equity method investees-net	88,717	128,468
Income before income tax expense	1,014,434	1,005,788
Reconciliation [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit	689,000	716,000
Credit for credit losses	187,000	59,000
Foreign exchange gains-net	23,000	1,000
Trading account profits (losses)-net	(50,000)	105,000
Equity investment securities gains-net	95,000	73,000
Debt investment securities losses-net	(5,000)	(36,000)
Equity in earnings of equity method investees-net	89,000	128,000
Other-net	(14,000)	(40,000)
Income before income tax expense	¥ 1,014,000	¥ 1,006,000

Fair Value (Assets and Liabilit

Fair Value (Assets and Liabilities Measured at Fair Value by Level on Recurring Basis) (Detail) - JPY (¥) ¥ in Millions		Sep. 30, 2017		Mar. 31, 2017
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	¥ 16,256,000		¥ 18,835,000
Investment securities, Available-for-sale securities		36,827,530		39,090,099
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	16,273,000		18,562,000
Obligation to return securities received as collateral		2,699,912		3,516,232
Interest Rate Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	12,211,000		14,242,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	12,265,000		14,328,000
Foreign Exchange Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	3,742,000		4,301,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	3,752,000		4,084,000
Equity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	206,000		188,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	253,000		182,000
Commodity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	29,000		35,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	27,000		31,000
Credit Derivatives [Member]
Assets:
Trading account assets, Trading derivative assets	[1],[2],[3]	67,000		67,000
Liabilities:
Trading account liabilities, Trading derivative liabilities	[1],[2],[3]	68,000		58,000
Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Assets:
Investment securities, Available-for-sale securities		22,508,623		25,826,288
Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member]
Assets:
Investment securities, Available-for-sale securities		1,250,611		1,015,489
Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member]
Assets:
Investment securities, Available-for-sale securities		2,301,651		2,149,929
Debt Securities [Member] | Corporate Bonds [Member]
Assets:
Investment securities, Available-for-sale securities		1,113,066		1,141,732
Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale securities		1,460,079		1,188,918
Debt Securities [Member] | Commercial Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale securities		82,870		80,268
Debt Securities [Member] | Asset-backed Securities [Member]
Assets:
Investment securities, Available-for-sale securities		1,505,653		1,378,272
Debt Securities [Member] | Other Debt Securities [Member]
Assets:
Investment securities, Available-for-sale securities		163,086	[4]	170,789	[5]
Marketable Equity Securities [Member]
Assets:
Investment securities, Available-for-sale securities		6,441,891		6,138,414
Fair Value, Measurements, Recurring [Member]
Assets:
Trading account assets, Trading securities	[6]	25,117,397		22,473,781
Trading account assets, Trading derivative assets		16,255,406		18,833,118
Investment securities, Available-for-sale securities		36,827,530		39,090,099
Investment securities, Other investment securities		25,564		26,292
Others	[7],[8]	844,431		495,006
Assets at fair value, Total		79,070,328		80,918,296
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		72,746		129,684
Trading account liabilities, Trading derivative liabilities		16,346,038		18,660,449
Obligation to return securities received as collateral		2,699,912		3,516,232
Others	[9]	512,583		405,156
Liabilities at fair value, Total		19,631,279		22,711,521
Fair Value, Measurements, Recurring [Member] | Real Estate Funds [Member]
Assets:
Investment securities valued at net asset value				41
Fair Value, Measurements, Recurring [Member] | Private Equity Funds [Member]
Assets:
Investment securities valued at net asset value		149		119
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities	[6]	12,437,573		10,646,728
Trading account assets, Trading derivative assets		93,551		112,687
Investment securities, Available-for-sale securities		27,150,763		30,214,302
Others	[7],[8]	791,644		453,214
Assets at fair value, Total		40,473,531		41,426,931
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		71,580		128,292
Trading account liabilities, Trading derivative liabilities		160,783		135,342
Obligation to return securities received as collateral		2,593,258		3,423,936
Liabilities at fair value, Total		2,825,621		3,687,570
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities	[6]	11,698,694		11,027,560
Trading account assets, Trading derivative assets		16,065,597		18,619,331
Investment securities, Available-for-sale securities		9,356,429		8,538,271
Others	[7],[8]	46,059		37,942
Assets at fair value, Total		37,166,779		38,223,104
Liabilities:
Trading account liabilities, Trading securities sold, not yet purchased		1,166		1,392
Trading account liabilities, Trading derivative liabilities		16,118,563		18,461,252
Obligation to return securities received as collateral		106,654		92,296
Others	[9]	480,968		376,724
Liabilities at fair value, Total		16,707,351		18,931,664
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities	[6]	981,130		799,493
Trading account assets, Trading derivative assets		96,258		101,100
Investment securities, Available-for-sale securities		320,338		337,526
Investment securities, Other investment securities		25,564		26,292
Others	[7],[8]	6,728		3,850
Assets at fair value, Total		1,430,018		1,268,261
Liabilities:
Trading account liabilities, Trading derivative liabilities		66,692		63,855
Others	[9]	31,615		28,432
Liabilities at fair value, Total		98,307		92,287
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		12,209,532		14,240,035
Liabilities:
Trading account liabilities, Trading derivative liabilities		12,245,296		14,304,615
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		9,912		27,321
Liabilities:
Trading account liabilities, Trading derivative liabilities		19,542		45,539
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		12,165,012		14,174,526
Liabilities:
Trading account liabilities, Trading derivative liabilities		12,210,073		14,249,439
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		34,608		38,188
Liabilities:
Trading account liabilities, Trading derivative liabilities		15,681		9,637
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		3,741,823		4,300,664
Liabilities:
Trading account liabilities, Trading derivative liabilities		3,752,217		4,083,603
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		1,813		9,661
Liabilities:
Trading account liabilities, Trading derivative liabilities		1,265		5,219
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		3,723,066		4,270,548
Liabilities:
Trading account liabilities, Trading derivative liabilities		3,745,399		4,072,787
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		16,944		20,455
Liabilities:
Trading account liabilities, Trading derivative liabilities		5,553		5,597
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		206,598		188,406
Liabilities:
Trading account liabilities, Trading derivative liabilities		253,377		182,015
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		81,788		75,545
Liabilities:
Trading account liabilities, Trading derivative liabilities		139,975		84,514
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		98,783		88,154
Liabilities:
Trading account liabilities, Trading derivative liabilities		86,514		66,482
Fair Value, Measurements, Recurring [Member] | Equity Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		26,027		24,707
Liabilities:
Trading account liabilities, Trading derivative liabilities		26,888		31,019
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member]
Assets:
Trading account assets, Trading derivative assets		30,801		36,645
Liabilities:
Trading account liabilities, Trading derivative liabilities		27,625		32,175
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading derivative assets		38		160
Liabilities:
Trading account liabilities, Trading derivative liabilities		1		70
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		12,084		18,740
Liabilities:
Trading account liabilities, Trading derivative liabilities		9,268		14,730
Fair Value, Measurements, Recurring [Member] | Commodity Contracts [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets		18,679		17,745
Liabilities:
Trading account liabilities, Trading derivative liabilities		18,356		17,375
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member]
Assets:
Trading account assets, Trading derivative assets		66,652		67,368
Liabilities:
Trading account liabilities, Trading derivative liabilities		67,523		58,041
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading derivative assets		66,652		67,363
Liabilities:
Trading account liabilities, Trading derivative liabilities		67,309		57,814
Fair Value, Measurements, Recurring [Member] | Credit Derivatives [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading derivative assets				5
Liabilities:
Trading account liabilities, Trading derivative liabilities		214		227
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Assets:
Trading account assets, Trading securities		2,152,801		2,184,380
Investment securities, Available-for-sale securities		22,508,623		25,826,288
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities		1,681,251		1,794,233
Investment securities, Available-for-sale securities		19,530,854		23,053,677
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		470,475		390,147
Investment securities, Available-for-sale securities		2,977,769		2,772,611
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		1,075
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member]
Assets:
Trading account assets, Trading securities		104,280		136,226
Investment securities, Available-for-sale securities		1,250,611		1,015,489
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		104,280		136,226
Investment securities, Available-for-sale securities		1,250,611		1,015,489
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member]
Assets:
Trading account assets, Trading securities		9,761,661		8,232,721
Investment securities, Available-for-sale securities		2,301,651		2,149,929
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities		9,292,742		7,764,734
Investment securities, Available-for-sale securities		1,562,500		1,360,060
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		468,019		466,151
Investment securities, Available-for-sale securities		719,042		769,770
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		900		1,836
Investment securities, Available-for-sale securities		20,109		20,099
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member]
Assets:
Trading account assets, Trading securities		3,307,933		3,331,041
Investment securities, Available-for-sale securities		1,113,066		1,141,732
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		3,274,382		3,305,520
Investment securities, Available-for-sale securities		1,106,288		1,104,800
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Corporate Bonds [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		33,551		25,521
Investment securities, Available-for-sale securities		6,778		36,932
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Assets:
Trading account assets, Trading securities		5,329,125		4,864,237
Investment securities, Available-for-sale securities		1,460,079		1,188,918
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		5,282,911		4,816,323
Investment securities, Available-for-sale securities		1,460,064		1,188,903
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		46,214		47,914
Investment securities, Available-for-sale securities		15		15
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Mortgage-backed Securities [Member]
Assets:
Investment securities, Available-for-sale securities		82,870		80,268
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Mortgage-backed Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale securities		79,986		77,297
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Mortgage-backed Securities [Member] | Level 3 [Member]
Assets:
Investment securities, Available-for-sale securities		2,884		2,971
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member]
Assets:
Trading account assets, Trading securities		1,226,363		935,316
Investment securities, Available-for-sale securities		1,505,653		1,378,272
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		399,664		280,502
Investment securities, Available-for-sale securities		1,368,242		1,261,353
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		826,699		654,814
Investment securities, Available-for-sale securities		137,411		116,919
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member]
Assets:
Trading account assets, Trading securities		35,630		40,707
Investment securities, Available-for-sale securities		163,086		170,789
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities				5,155
Investment securities, Available-for-sale securities		9,945		10,199
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Debt Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities		35,630		35,552
Investment securities, Available-for-sale securities		153,141		160,590
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Paper [Member]
Assets:
Trading account assets, Trading securities		1,093,750		1,084,421
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Commercial Paper [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities		1,093,750		1,084,421
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Trading account assets, Trading securities	[10]	2,105,854		1,664,732
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Private Equity Funds [Member]
Assets:
Investment securities valued at net asset value		17,308		13,150
Unfunded commitments related to equity securities		44,670		27,735
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 1 [Member]
Assets:
Trading account assets, Trading securities	[10]	1,463,580		1,087,761
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 2 [Member]
Assets:
Trading account assets, Trading securities	[10]	605,213		543,115
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 3 [Member]
Assets:
Trading account assets, Trading securities	[10]	37,061		33,856
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member]
Assets:
Investment securities, Available-for-sale securities		6,441,891		6,138,414
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] | Level 1 [Member]
Assets:
Investment securities, Available-for-sale securities		6,057,409		5,800,565
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] | Level 2 [Member]
Assets:
Investment securities, Available-for-sale securities		¥ 384,482		¥ 337,849
[1]	For more information about fair value measurement and assumptions used to measure the fair value of derivatives, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.
[2]	The fair value of derivative instruments is presented on a gross basis even when derivative instruments are subject to master netting agreements. Cash collateral payable and receivable associated with derivative instruments are not added to or netted against the fair value amounts.
[3]	This table does not include contracts with embedded derivatives for which the fair value option has been elected.
[4]	Other debt securities in the table above include ¥153,030 million of private placement debt conduit bonds.
[5]	Other debt securities in the table above include ¥160,479 million of private placement debt conduit bonds.
[6]	Includes securities measured under the fair value option.
[7]	Excludes certain investments valued at net asset value of real estate funds and private equity funds, whose fair values at March 31, 2017 were ¥41 million, and ¥119 million, respectively, and those at September 30, 2017 were nil, and ¥149 million, respectively. For the nature and details of real estate funds and private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.
[8]	Mainly comprises securities received as collateral that may be sold or repledged under securities lending transactions, money in trust for segregating cash deposited by customers on security transactions and derivative assets designated as hedging instruments.
[9]	Includes other short-term borrowings, long-term debt, bifurcated embedded derivatives carried at fair value and derivative liabilities designated as hedging instruments.
[10]	Excludes certain investments valued at net asset value of private equity funds, whose fair values at March 31, 2017 were ¥13,150 million, and those at September 30, 2017 were ¥17,308 million, respectively. The amounts of unfunded commitments related to these private equity funds at March 31, 2017 were ¥27,735 million, and those at September 30, 2017 were ¥44,670 million, respectively. For the nature and details of private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.

Fair Value (Transfers between L

Fair Value (Transfers between Level 1 and Level 2) (Detail) - Fair Value, Measurements, Recurring [Member] - Investment Securities, Available-for-sale Securities [Member] - Marketable Equity Securities [Member] - JPY (¥) ¥ in Millions		Sep. 30, 2017	Sep. 30, 2016
Assets, Fair Value Disclosure [Abstract]
Transfers out of Level 1 into Level 2, Assets	[1]	¥ 1,981	¥ 20,689
Transfers out of Level 2 into Level 1, Assets	[1]	¥ 3,839	¥ 4,578
[1]	All transfers between Level 1 and Level 2 were assumed to have occurred at the beginning of the period.

Fair Value (Reconciliation of A

Fair Value (Reconciliation of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Level 3 Inputs) (Detail) - Fair Value, Measurements, Recurring [Member] - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		¥ 1,204,406	¥ 1,312,009
Total gains (losses) for the period included in earnings, Assets		26,675	(79,080)
Total gains (losses) for the period included in other comprehensive income, Assets		(10,693)	(50,829)
Purchases, Assets		667,588	278,259
Issues, Assets		(1,385)	(417)
Sales, Assets		(129,415)	(70,585)
Settlements, Assets		(372,510)	(283,327)
Transfers into Level 3, Assets	[1]	22,326	51,133
Transfers out of Level 3, Assets	[1]	(43,666)	(35,690)
Level 3 assets, Ending balance		1,363,326	1,121,473
Change in unrealized gains (losses) included in earnings for assets still held at period end		27,630	(66,431)
Level 3 liabilities, Beginning balance		28,432	(9,821)
Total gains (losses) for the period included in earnings, Liabilities		(24,919)	4,188
Total gains (losses) for the period included in other comprehensive income, Liabilities		(595)	5,993
Purchases, Liabilities
Issues, Liabilities		4,243	837
Sales, Liabilities
Settlements, Liabilities		(13,055)	(8,530)
Transfers into Level 3, Liabilities	[1]	1,888	6,791
Transfers out of Level 3, Liabilities	[1]	(15,407)	(15,678)
Level 3 liabilities, Ending balance		31,615	(36,582)
Change in unrealized gains (losses) included in earnings for liabilities still held at period end		(18,694)	6,001
Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 liabilities, Beginning balance		28,432	(9,821)
Total gains (losses) for the period included in earnings, Liabilities	[2]	(24,919)	4,188
Total gains (losses) for the period included in other comprehensive income, Liabilities		(595)	5,993
Purchases, Liabilities
Issues, Liabilities		4,243	837
Sales, Liabilities
Settlements, Liabilities		(13,055)	(8,530)
Transfers into Level 3, Liabilities	[1]	1,888	6,791
Transfers out of Level 3, Liabilities	[1]	(15,407)	(15,678)
Level 3 liabilities, Ending balance		31,615	(36,582)
Change in unrealized gains (losses) included in earnings for liabilities still held at period end	[2]	(18,694)	6,001
Trading Account Assets, Trading Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance	[3]	799,493	879,946
Total gains (losses) for the period included in earnings, Assets	[3],[4]	18,075	(86,056)
Purchases, Assets	[3]	522,384	136,497
Sales, Assets	[3]	(128,188)	(67,356)
Settlements, Assets	[3]	(240,479)	(118,887)
Transfers into Level 3, Assets	[1],[3]	20,416	48,105
Transfers out of Level 3, Assets	[1],[3]	(10,571)	(26,875)
Level 3 assets, Ending balance	[3]	981,130	765,374
Change in unrealized gains (losses) included in earnings for assets still held at period end	[3],[4]	18,905	(80,271)
Trading Account Assets, Trading Securities [Member] | Debt Securities [Member] | Japanese National Government and Japanese Government Agency Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total gains (losses) for the period included in earnings, Assets		(4)	(1,203)
Purchases, Assets		1,079
Transfers into Level 3, Assets	[1]		11,315
Level 3 assets, Ending balance		1,075	10,112
Change in unrealized gains (losses) included in earnings for assets still held at period end		(4)	(1,203)
Trading Account Assets, Trading Securities [Member] | Debt Securities [Member] | Japanese Prefectural and Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance			2,467
Total gains (losses) for the period included in earnings, Assets			84
Sales, Assets			(2,551)
Trading Account Assets, Trading Securities [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		1,836	57,470
Total gains (losses) for the period included in earnings, Assets		341	(5,793)
Purchases, Assets		37,112	16,168
Sales, Assets		(37,369)	(16,302)
Settlements, Assets		(47)	(50,611)
Transfers out of Level 3, Assets	[1]	(973)	(6)
Level 3 assets, Ending balance		900	926
Change in unrealized gains (losses) included in earnings for assets still held at period end		69	(132)
Trading Account Assets, Trading Securities [Member] | Debt Securities [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		25,521	98,236
Total gains (losses) for the period included in earnings, Assets		(1,979)	(5,524)
Purchases, Assets		3,170	2,063
Sales, Assets		(533)	(1,058)
Settlements, Assets		(3,347)	(55,571)
Transfers into Level 3, Assets	[1],[5]	20,317	36,790
Transfers out of Level 3, Assets	[1],[5]	(9,598)	(26,869)
Level 3 assets, Ending balance		33,551	48,067
Change in unrealized gains (losses) included in earnings for assets still held at period end		(1,957)	(5,098)
Trading Account Assets, Trading Securities [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		47,914	23,540
Total gains (losses) for the period included in earnings, Assets		2,344	(9,188)
Purchases, Assets			38,086
Settlements, Assets		(4,044)	(3,956)
Level 3 assets, Ending balance		46,214	48,482
Change in unrealized gains (losses) included in earnings for assets still held at period end		2,306	(8,817)
Trading Account Assets, Trading Securities [Member] | Debt Securities [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		654,814	630,247
Total gains (losses) for the period included in earnings, Assets		16,454	(61,503)
Purchases, Assets		476,136	79,336
Sales, Assets		(88,454)	(47,445)
Settlements, Assets		(232,251)	(7,914)
Level 3 assets, Ending balance		826,699	592,721
Change in unrealized gains (losses) included in earnings for assets still held at period end		18,037	(61,717)
Trading Account Assets, Trading Securities [Member] | Debt Securities [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		35,552	35,944
Total gains (losses) for the period included in earnings, Assets		78	(3,807)
Level 3 assets, Ending balance		35,630	32,137
Change in unrealized gains (losses) included in earnings for assets still held at period end		79	(3,807)
Trading Account Assets, Trading Securities [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		33,856	32,042
Total gains (losses) for the period included in earnings, Assets		841	878
Purchases, Assets		4,887	844
Sales, Assets		(1,832)
Settlements, Assets		(790)	(835)
Transfers into Level 3, Assets	[1]	99
Level 3 assets, Ending balance		37,061	32,929
Change in unrealized gains (losses) included in earnings for assets still held at period end		375	503
Trading Account Assets, Trading Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		37,245	31,254
Total gains (losses) for the period included in earnings, Assets	[4]	7,470	6,608
Total gains (losses) for the period included in other comprehensive income, Assets		133	(911)
Purchases, Assets		568	544
Issues, Assets		(1,385)	(417)
Settlements, Assets		(13,829)	(7,722)
Transfers into Level 3, Assets	[1]	1,817	1,535
Transfers out of Level 3, Assets	[1]	(2,453)	(3,134)
Level 3 assets, Ending balance		29,566	27,757
Change in unrealized gains (losses) included in earnings for assets still held at period end	[4]	10,436	14,318
Trading Account Assets, Trading Derivatives [Member] | Interest Rate Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		28,551	38,213
Total gains (losses) for the period included in earnings, Assets		(303)	(496)
Total gains (losses) for the period included in other comprehensive income, Assets		(93)	(597)
Settlements, Assets		(6,231)	(4,428)
Transfers into Level 3, Assets	[1]	(3,399)	1,139
Transfers out of Level 3, Assets	[1]	402	(817)
Level 3 assets, Ending balance		18,927	33,014
Change in unrealized gains (losses) included in earnings for assets still held at period end		400	3,205
Trading Account Assets, Trading Derivatives [Member] | Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		14,858	1,235
Total gains (losses) for the period included in earnings, Assets		(5,533)	417
Total gains (losses) for the period included in other comprehensive income, Assets		115	105
Purchases, Assets		235	477
Issues, Assets		(228)	(10)
Settlements, Assets		189	(1,289)
Transfers into Level 3, Assets	[1]	5,216	396
Transfers out of Level 3, Assets	[1]	(3,461)	(2,354)
Level 3 assets, Ending balance		11,391	(1,023)
Change in unrealized gains (losses) included in earnings for assets still held at period end		(2,516)	1,231
Trading Account Assets, Trading Derivatives [Member] | Equity Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		(6,312)	(7,915)
Total gains (losses) for the period included in earnings, Assets		13,082	7,279
Total gains (losses) for the period included in other comprehensive income, Assets		112	(384)
Purchases, Assets		332	56
Issues, Assets		(794)	(56)
Settlements, Assets		(7,887)	(2,125)
Transfers out of Level 3, Assets	[1]	606	37
Level 3 assets, Ending balance		(861)	(3,108)
Change in unrealized gains (losses) included in earnings for assets still held at period end		11,710	9,678
Trading Account Assets, Trading Derivatives [Member] | Commodity Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		370	(345)
Total gains (losses) for the period included in earnings, Assets		261	(250)
Total gains (losses) for the period included in other comprehensive income, Assets		(1)	(18)
Purchases, Assets		1	11
Issues, Assets		(363)	(351)
Settlements, Assets		55	97
Level 3 assets, Ending balance		323	(856)
Change in unrealized gains (losses) included in earnings for assets still held at period end		880	415
Trading Account Assets, Trading Derivatives [Member] | Credit Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		(222)	66
Total gains (losses) for the period included in earnings, Assets		(37)	(342)
Total gains (losses) for the period included in other comprehensive income, Assets			(17)
Settlements, Assets		45	23
Level 3 assets, Ending balance		(214)	(270)
Change in unrealized gains (losses) included in earnings for assets still held at period end		(38)	(211)
Investment Securities, Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		337,526	375,274
Total gains (losses) for the period included in earnings, Assets	[6]	2,053	(1,944)
Total gains (losses) for the period included in other comprehensive income, Assets		(10,705)	(49,778)
Purchases, Assets		139,993	138,693
Sales, Assets		(30)	(42)
Settlements, Assets		(118,202)	(156,705)
Transfers into Level 3, Assets	[1]	93	39
Transfers out of Level 3, Assets	[1]	(30,390)	(5,681)
Level 3 assets, Ending balance		320,338	299,856
Change in unrealized gains (losses) included in earnings for assets still held at period end	[6]	(69)	151
Investment Securities, Available-for-sale Securities [Member] | Debt Securities [Member] | Foreign Governments and Official Institutions Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		20,099	20,941
Total gains (losses) for the period included in other comprehensive income, Assets		(184)	(2,674)
Purchases, Assets		248	258
Settlements, Assets		(54)	(255)
Level 3 assets, Ending balance		20,109	18,270
Investment Securities, Available-for-sale Securities [Member] | Debt Securities [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		36,932	23,595
Total gains (losses) for the period included in earnings, Assets		115	408
Total gains (losses) for the period included in other comprehensive income, Assets		(17)	(513)
Purchases, Assets		521	9,086
Sales, Assets		(30)	(42)
Settlements, Assets		(446)	(4,964)
Transfers into Level 3, Assets	[1],[5]	93	39
Transfers out of Level 3, Assets	[1],[5]	(30,390)	(5,681)
Level 3 assets, Ending balance		6,778	21,928
Change in unrealized gains (losses) included in earnings for assets still held at period end		(69)	151
Investment Securities, Available-for-sale Securities [Member] | Debt Securities [Member] | Residential Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		15	15
Level 3 assets, Ending balance		15	15
Investment Securities, Available-for-sale Securities [Member] | Debt Securities [Member] | Commercial Mortgage-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		2,971	3,764
Total gains (losses) for the period included in other comprehensive income, Assets		(49)	(400)
Settlements, Assets		(38)	(43)
Level 3 assets, Ending balance		2,884	3,321
Investment Securities, Available-for-sale Securities [Member] | Debt Securities [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		116,919	158,281
Total gains (losses) for the period included in earnings, Assets		1,938	(2,352)
Total gains (losses) for the period included in other comprehensive income, Assets		(4,971)	(21,435)
Purchases, Assets		139,224	120,722
Settlements, Assets		(115,699)	(142,666)
Level 3 assets, Ending balance		137,411	112,550
Investment Securities, Available-for-sale Securities [Member] | Debt Securities [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		160,590	168,678
Total gains (losses) for the period included in other comprehensive income, Assets		(5,484)	(24,756)
Purchases, Assets			8,627
Settlements, Assets		(1,965)	(8,777)
Level 3 assets, Ending balance		153,141	143,772
Investment Securities, Other Investment Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		26,292	24,689
Total gains (losses) for the period included in earnings, Assets	[2]	(648)	2,487
Purchases, Assets		1,366	2,077
Sales, Assets		(1,194)	(3,162)
Settlements, Assets			(13)
Transfers out of Level 3, Assets	[1]	(252)
Level 3 assets, Ending balance		25,564	26,078
Change in unrealized gains (losses) included in earnings for assets still held at period end	[2]	(1,280)	(301)
Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Level 3 assets, Beginning balance		3,850	846
Total gains (losses) for the period included in earnings, Assets	[2]	(275)	(175)
Total gains (losses) for the period included in other comprehensive income, Assets		(121)	(140)
Purchases, Assets		3,277	448
Sales, Assets		(3)	(25)
Transfers into Level 3, Assets	[1]		1,454
Level 3 assets, Ending balance		6,728	2,408
Change in unrealized gains (losses) included in earnings for assets still held at period end	[2]	¥ (362)	¥ (328)
[1]	All transfers out of Level 3 or into Level 3 were assumed to have occurred at the beginning of the period.
[2]	Included in Trading account profits-net.
[3]	Includes Trading securities measured under the fair value option.
[4]	Included in Trading account profits-net and in Foreign exchange losses-net.
[5]	Transfers into (out of) Level 3 for corporate bonds were mainly caused by the decrease (increase) in liquidity.
[6]	Included in Investment securities gains-net.

Fair Value (Quantitative Inform

Fair Value (Quantitative Information about Level 3 Fair Value Measurements) (Detail) - Fair Value, Measurements, Recurring [Member] - JPY (¥) ¥ in Millions		6 Months Ended	12 Months Ended
		Sep. 30, 2017	Mar. 31, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities at fair value		¥ 79,070,328	¥ 80,918,296
Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities at fair value		1,430,018	1,268,261
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities at fair value	[1]	¥ 20,109	¥ 20,099
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Minimum [Member]
Significant unobservable inputs
Probability of default		0.10%	0.10%
Recovery rate		60.00%	60.00%
Market-required return on capital		8.00%	8.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Maximum [Member]
Significant unobservable inputs
Probability of default		0.40%	0.40%
Recovery rate		70.00%	70.00%
Market-required return on capital		10.00%	10.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Foreign Governments and Official Institutions Bonds [Member] | Return on Equity Method [Member] | Weighted Average [Member]
Significant unobservable inputs
Probability of default	[2]	0.30%	0.30%
Recovery rate	[2]	66.70%	67.00%
Market-required return on capital	[2]	9.50%	9.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Corporate Bonds [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities at fair value	[1]	¥ 3,323	¥ 19,313
Significant unobservable inputs
Probability of default		8.10%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Corporate Bonds [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Significant unobservable inputs
Probability of default			4.40%
Recovery rate		41.00%	41.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Corporate Bonds [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Significant unobservable inputs
Probability of default			8.80%
Recovery rate		68.30%	81.20%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Corporate Bonds [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Significant unobservable inputs
Probability of default	[2]	8.10%	5.60%
Recovery rate	[2]	45.90%	42.80%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities at fair value	[1]	¥ 124,629	¥ 108,132
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Significant unobservable inputs
Probability of default		1.20%	1.20%
Recovery rate		60.00%	60.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Significant unobservable inputs
Probability of default		5.30%	5.30%
Recovery rate		76.00%	76.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Significant unobservable inputs
Probability of default	[2]	4.40%	4.30%
Recovery rate	[2]	67.10%	64.70%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities at fair value	[1],[3]	¥ 826,699	¥ 650,814
Significant unobservable inputs
Asset correlations	[3]	11.00%
Discount factor	[3]	1.10%
Prepayment rate	[3]	40.50%
Recovery rate	[3]	71.50%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Minimum [Member]
Significant unobservable inputs
Asset correlations	[3]		7.00%
Discount factor	[3]		1.20%
Prepayment rate	[3]		9.50%
Probability of default	[3]	0.00%	0.00%
Recovery rate	[3]		52.80%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Maximum [Member]
Significant unobservable inputs
Asset correlations	[3]		11.00%
Discount factor	[3]		1.40%
Prepayment rate	[3]		29.50%
Probability of default	[3]	87.90%	83.10%
Recovery rate	[3]		80.90%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Residential Mortgage-backed Securities, Commercial Mortgage-backed Securities and Asset-backed Securities [Member] | Internal Model [Member] | Weighted Average [Member]
Significant unobservable inputs
Asset correlations	[2],[3]	11.00%	11.00%
Discount factor	[2],[3]	1.10%	1.20%
Prepayment rate	[2],[3]	40.50%	29.30%
Probability of default	[2],[3],[4]
Recovery rate	[2],[3]	71.50%	80.60%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Other Debt Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities at fair value	[1]	¥ 35,630	¥ 35,552
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Other Debt Securities [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Significant unobservable inputs
Liquidity premium		0.50%	0.50%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Other Debt Securities [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Significant unobservable inputs
Liquidity premium		1.00%	1.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Other Debt Securities [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Significant unobservable inputs
Liquidity premium	[2]	0.60%	0.60%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Other Debt Securities [Member] | Return on Equity Method [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading securities and Investment securities at fair value	[1]	¥ 153,030	¥ 160,479
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Other Debt Securities [Member] | Return on Equity Method [Member] | Minimum [Member]
Significant unobservable inputs
Probability of default		0.00%	0.00%
Recovery rate		40.00%	40.00%
Market-required return on capital		8.00%	8.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Other Debt Securities [Member] | Return on Equity Method [Member] | Maximum [Member]
Significant unobservable inputs
Probability of default		25.00%	25.00%
Recovery rate		90.00%	90.00%
Market-required return on capital		10.00%	10.00%
Level 3 [Member] | Trading Securities and Investment Securities [Member] | Other Debt Securities [Member] | Return on Equity Method [Member] | Weighted Average [Member]
Significant unobservable inputs
Probability of default	[2]	0.40%	0.30%
Recovery rate	[2]	71.60%	71.10%
Market-required return on capital	[2]	9.70%	9.70%
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Interest Rate Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net at fair value	[1]	¥ 18,732	¥ 28,297
Significant unobservable inputs
Probability of prepayment		100.00%
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Interest Rate Contracts [Member] | Option Model [Member] | Minimum [Member]
Significant unobservable inputs
Probability of default		0.00%	0.10%
Correlation between interest rates		35.70%	36.00%
Correlation between interest rate and foreign exchange rate		20.90%	20.40%
Recovery rate		41.00%	41.00%
Volatility		18.90%	21.60%
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Interest Rate Contracts [Member] | Option Model [Member] | Maximum [Member]
Significant unobservable inputs
Probability of default		12.60%	13.20%
Correlation between interest rates		51.40%	100.00%
Correlation between interest rate and foreign exchange rate		51.50%	48.80%
Recovery rate		48.00%	48.00%
Volatility		100.00%	100.00%
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Foreign Exchange Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net at fair value	[1]	¥ 11,424	¥ 14,890
Significant unobservable inputs
Correlation between underlying assets		85.00%	85.00%
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Foreign Exchange Contracts [Member] | Option Model [Member] | Minimum [Member]
Significant unobservable inputs
Probability of default		0.00%	0.10%
Correlation between interest rates		40.30%	40.30%
Correlation between interest rate and foreign exchange rate		46.40%	46.40%
Recovery rate		41.00%	41.00%
Volatility		12.30%	16.80%
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Foreign Exchange Contracts [Member] | Option Model [Member] | Maximum [Member]
Significant unobservable inputs
Probability of default		12.60%	8.70%
Correlation between interest rates		74.00%	74.00%
Correlation between interest rate and foreign exchange rate		50.70%	50.70%
Recovery rate		48.00%	48.00%
Volatility		17.80%	20.60%
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Equity Contracts [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net at fair value	[1]	¥ 5,313
Significant unobservable inputs
Term of litigation		2 years 6 months
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Equity Contracts [Member] | Option Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Trading derivatives-net at fair value	[1]	¥ (5,598)	¥ (6,659)
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Equity Contracts [Member] | Option Model [Member] | Minimum [Member]
Significant unobservable inputs
Correlation between interest rate and equity		13.70%	33.30%
Volatility			29.80%
Correlation between foreign exchange rate and equity		3.00%	3.00%
Correlation between equities		21.80%	25.50%
Level 3 [Member] | Trading Account Assets, Trading Derivatives-net [Member] | Equity Contracts [Member] | Option Model [Member] | Maximum [Member]
Significant unobservable inputs
Correlation between interest rate and equity		39.00%	39.00%
Volatility			127.40%
Correlation between foreign exchange rate and equity		68.50%	69.20%
Correlation between equities		82.90%	81.30%
[1]	The fair value as of March 31, 2017 and September 30, 2017 excludes the fair value of investments valued using vendor prices.
[2]	Weighted averages are calculated by weighing each input by the relative fair value of the respective financial instruments.
[3]	For further detail of Internal model, refer to the last paragraph of "Trading Account Assets and Liabilities-Trading Account Securities" in Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.
[4]	See "Probability of default" in "Sensitivity to and range of unobservable inputs" in Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.

Fair Value (Carrying Value of A

Fair Value (Carrying Value of Assets Measured at Fair Value on Nonrecurring Basis by Level) (Detail) - Fair Value, Measurements, Nonrecurring [Member] - JPY (¥) ¥ in Millions		Sep. 30, 2017	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities	[1]	¥ 1,397	¥ 2,224
Loans		275,640	233,924
Loans, Loans held for sale		25,339	6,480
Loans, Collateral dependent loans		250,301	227,444
Premises and equipment		7,960	3,507
Intangible assets		8,458	1,652
Goodwill			4,869
Other assets		96,064	6,872
Other assets, Investments in equity method investees	[1]	92,223
Other assets, Other		3,841	6,872
Assets at fair value, Total		389,519	253,048
Private Equity Funds and Limited Partnerships [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities valued at net asset value		10,340	15,884
Unfunded commitments related to investment securities valued at net asset value		1,167	5,359
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Loans		4,746	4,941
Loans, Collateral dependent loans		4,746	4,941
Other assets		92,223
Other assets, Investments in equity method investees	[1]	92,223
Assets at fair value, Total		96,969	4,941
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Loans		12,179	9,020
Loans, Collateral dependent loans		12,179	9,020
Assets at fair value, Total		12,179	9,020
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investment securities	[1]	1,397	2,224
Loans		258,715	219,963
Loans, Loans held for sale		25,339	6,480
Loans, Collateral dependent loans		233,376	213,483
Premises and equipment		7,960	3,507
Intangible assets		8,458	1,652
Goodwill			4,869
Other assets		3,841	6,872
Other assets, Other		3,841	6,872
Assets at fair value, Total		¥ 280,371	¥ 239,087
[1]	Excludes certain investments valued at net asset value of ¥15,884 million and ¥10,340 million at March 31, 2017 and September 30, 2017, respectively. The unfunded commitments related to these investments are ¥5,359 million and ¥1,167 million at March 31, 2017 and September 30, 2017, respectively. These investments are in private equity funds. For the nature and details of private equity funds, see Note 32 to the consolidated financial statements for the fiscal year ended March 31, 2017.

Fair Value (Losses Recorded as

Fair Value (Losses Recorded as a Result of Changes in Fair Value Measured on a Nonrecurring Basis) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	¥ 77,278	¥ 41,222
Investment Securities [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	284	388
Loans [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	25,781	32,889
Loans [Member] | Loans Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	249	343
Loans [Member] | Collateral Dependent Loans [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	25,532	32,546
Premises and Equipment [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	6,227	4,706
Intangible Assets [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	16,591	968
Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	28,395	2,271
Other Assets [Member] | Investments in Equity Method Investees [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	27,985	1,820
Other Assets [Member] | Other [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Losses on change in fair value	¥ 410	¥ 451

Fair Value (Gains (Losses) Rela

Fair Value (Gains (Losses) Related to Instruments for which Fair Value Option was Elected) (Detail) - JPY (¥) ¥ in Millions		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Financial Liabilities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		¥ 3,226	¥ (107,508)
Financial Liabilities [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		3,226	(107,508)
Financial Liabilities [Member] | Other Short-term Borrowings [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	2,054	(7,129)
Financial Liabilities [Member] | Other Short-term Borrowings [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	2,054	(7,129)
Financial Liabilities [Member] | Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	1,172	(100,379)
Financial Liabilities [Member] | Long-term Debt [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	[1]	1,172	(100,379)
Financial Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		551,579	(2,293,820)
Financial Assets [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		90,632	153,101
Financial Assets [Member] | Foreign Exchange Gains (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		460,947	(2,446,921)
Financial Assets [Member] | Trading Account Assets, Trading Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		551,579	(2,293,820)
Financial Assets [Member] | Trading Account Assets, Trading Securities [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		90,632	153,101
Financial Assets [Member] | Trading Account Assets, Trading Securities [Member] | Foreign Exchange Gains (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value		¥ 460,947	¥ (2,446,921)
[1]	Change in value attributable to the instrument-specific credit risk related to those financial liabilities are not material.

Fair Value (Differences between

Fair Value (Differences between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding) (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2017	Mar. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Remaining aggregate contractual amounts outstanding, Financial liabilities	¥ 369,452	¥ 404,510
Fair value, Financial liabilities	348,196	377,423
Fair value over (under) remaining aggregate contractual amounts outstanding, Financial liabilities	(21,256)	(27,087)
Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Remaining aggregate contractual amounts outstanding, Financial liabilities	369,452	404,510
Fair value, Financial liabilities	348,196	377,423
Fair value over (under) remaining aggregate contractual amounts outstanding, Financial liabilities	¥ (21,256)	¥ (27,087)

Fair Value (Summary of Carrying

Fair Value (Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments Not Carried at Fair Value on Recurring Basis on Balance Sheets by Level) (Detail) - JPY (¥) ¥ in Billions		Sep. 30, 2017	Mar. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts of cost-method investment securities not practical to estimate fair value and no indicators of impairment		¥ 430	¥ 429
Carrying amounts of investments in equity method investees		2,216	2,200
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		30,987	25,683
Interest-earning deposits in other banks		39,128	38,327
Call loans and funds sold		757	704
Receivables under resale agreements		6,701	8,188
Receivables under securities borrowing transactions		9,839	11,003
Investment securities	[1],[2]	3,330	3,688
Loans, net of allowance for credit losses	[3]	117,319	117,033
Other financial assets	[4]	7,372	5,827
Deposits, Non-interest-bearing		28,367	29,486
Deposits, Interest-bearing		163,430	160,928
Total deposits		191,797	190,414
Call money and funds purchased		2,529	1,975
Payables under repurchase agreements		17,119	16,081
Payables under securities lending transactions		4,790	5,549
Due to trust account		3,088	3,335
Other short-term borrowings		8,037	7,857
Long-term debt		29,866	27,475
Other financial liabilities		6,952	6,094
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		30,987	25,683
Interest-earning deposits in other banks		39,128	38,327
Call loans and funds sold		757	704
Receivables under resale agreements		6,701	8,188
Receivables under securities borrowing transactions		9,839	11,003
Investment securities	[1],[2]	3,449	3,808
Loans, net of allowance for credit losses	[3]	118,767	118,765
Other financial assets	[4]	7,372	5,827
Deposits, Non-interest-bearing		28,367	29,486
Deposits, Interest-bearing		163,440	160,948
Total deposits		191,807	190,434
Call money and funds purchased		2,529	1,975
Payables under repurchase agreements		17,119	16,081
Payables under securities lending transactions		4,790	5,549
Due to trust account		3,088	3,335
Other short-term borrowings		8,037	7,857
Long-term debt		30,028	27,627
Other financial liabilities		6,952	6,094
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks		30,987	25,683
Investment securities	[1],[2]	1,201	1,206
Loans, net of allowance for credit losses	[3]	5	5
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest-earning deposits in other banks		39,128	38,327
Call loans and funds sold		757	704
Receivables under resale agreements		6,701	8,188
Receivables under securities borrowing transactions		9,839	11,003
Investment securities	[1],[2]	1,106	1,144
Loans, net of allowance for credit losses	[3]	261	257
Other financial assets	[4]	7,372	5,827
Deposits, Non-interest-bearing		28,367	29,486
Deposits, Interest-bearing		163,440	160,948
Total deposits		191,807	190,434
Call money and funds purchased		2,529	1,975
Payables under repurchase agreements		17,119	16,081
Payables under securities lending transactions		4,790	5,549
Due to trust account		3,088	3,335
Other short-term borrowings		8,037	7,857
Long-term debt		30,028	27,627
Other financial liabilities		6,952	6,094
Estimated Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	[1],[2]	1,142	1,458
Loans, net of allowance for credit losses	[3]	¥ 118,501	¥ 118,503
[1]	Excludes cost-method investments of ¥429 billion and ¥430 billion at March 31, 2017 and September 30, 2017, respectively, of which the MUFG Group did not estimate the fair value since it was not practical and no impairment indicators were identified. See Note 3 for the details of these cost-method investments.
[2]	Includes impaired securities measured at fair value on a nonrecurring basis. Refer to "Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis" for the details of the level classification.
[3]	Includes loans held for sale and collateral dependent loans measured at fair value on a nonrecurring basis. Refer to "Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis" for the details of the level classification.
[4]	Excludes investments in equity method investees of ¥2,200 billion and ¥2,216 billion at March 31, 2017 and September 30, 2017, respectively.

Investments in Equity Method103

Investments in Equity Method Investees (Summarized Operating Results of Morgan Stanley) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Equity Method Investment, Summarized Financial Information, Income and Loss
Income before income tax expense	¥ 1,014,434	¥ 1,005,788
Morgan Stanley [Member]
Equity Method Investment, Summarized Financial Information, Income and Loss
Net revenues	2,077,000	1,876,000
Total non-interest expenses	1,508,000	1,364,000
Income before income tax expense	569,000	512,000
Net income applicable to Morgan Stanley	¥ 393,000	¥ 335,000

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Detail) - Subsequent Event [Member] ¥ / shares in Units, IDR / shares in Units, ¥ in Millions, IDR in Billions	Dec. 29, 2017JPY (¥)¥ / shares		Dec. 29, 2017IDR	Dec. 26, 2017Offices	Dec. 05, 2017JPY (¥)	Nov. 14, 2017JPY (¥)¥ / sharesshares	Dec. 22, 2017JPY (¥)shares	Sep. 30, 2018	Dec. 29, 2017IDR / shares
Acquisition of Shares in Bank Danamon in Indonesia [Member]
Subsequent Event [Line Items]
Number of offices in Indonesia | Offices				1,800
Description of strategic investment				Executed through three steps (the “Proposed Transaction”), and the completion of the Proposed Transaction will result in BTMU becoming the largest shareholder in Danamon and Danamon becoming a consolidated subsidiary of BTMU.
Approximate percentage of aggregated equity interest	19.90%		19.90%
Price per share paid in Step 1 | (per share)	¥ 70	[1]							IDR 8,323
Investment amount paid in Step 1	¥ 133,000	[1]	IDR 15,875
Description of Calculation basis	A price book-value ratio of 2.0 calculated on the basis of Danamon’s net assets as of September 30, 2017 with certain adjustments applied.		A price book-value ratio of 2.0 calculated on the basis of Danamon’s net assets as of September 30, 2017 with certain adjustments applied.
Price book-value ratio	2								2
Exchange rate of IDR	0.0084								0.0084
Acquisition of Shares in Bank Danamon in Indonesia [Member] | Completion of Acquisition Steps [Member]
Subsequent Event [Line Items]
Approximate percentage of aggregated equity interest				73.80%
Approximate percentage of additional equity interests acquired								20.10%
Approximate percentage of aggregated equity interest								40.00%
MUFG Capital Finance 6 Limited [Member] | Non-cumulative and Non-dilutive Perpetual Preferred Securities [Member]
Subsequent Event [Line Items]
Non-dilutive perpetual preferred securities redeemed					¥ 150,000
Redemption date					Jan. 25, 2018
Common Stock [Member]
Subsequent Event [Line Items]
Dividends payable, amount per share | ¥ / shares						¥ 9
Dividends payable, total amount						¥ 119,890
Dividends payable, date to be paid						Dec. 5, 2017
Dividends payable, date of record						Sep. 30, 2017
Number of own shares repurchased | shares							127,666,900
Approximate repurchase amount in aggregate of own shares based on the discretionary dealing contract							¥ 100,000
Approximate percentage of shares allowed for repurchase over total number of outstanding shares						1.50%
Date of own shares to be cancelled						Jan. 22, 2018
Common Stock [Member] | Maximum [Member]
Subsequent Event [Line Items]
Number of shares allowed for repurchase | shares						200,000,000
Aggregate amount of shares allowed for repurchase						¥ 100,000
[1]	Calculated based on the exchange rate of IDR1 = ¥0.0084